US20120149611A1 - Coating Composition For Sliding Members - Google Patents
Coating Composition For Sliding Members Download PDFInfo
- Publication number
- US20120149611A1 US20120149611A1 US13/391,308 US201013391308A US2012149611A1 US 20120149611 A1 US20120149611 A1 US 20120149611A1 US 201013391308 A US201013391308 A US 201013391308A US 2012149611 A1 US2012149611 A1 US 2012149611A1
- Authority
- US
- United States
- Prior art keywords
- film
- coating composition
- silicone resin
- none none
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000008199 coating composition Substances 0.000 title claims abstract description 66
- 229920002050 silicone resin Polymers 0.000 claims abstract description 53
- 239000007787 solid Substances 0.000 claims abstract description 51
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 239000011347 resin Substances 0.000 claims abstract description 43
- 239000000314 lubricant Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 11
- 239000005060 rubber Substances 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 8
- 239000011521 glass Substances 0.000 abstract description 33
- 239000010408 film Substances 0.000 description 39
- 239000000203 mixture Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 19
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 18
- 239000002245 particle Substances 0.000 description 18
- 239000002904 solvent Substances 0.000 description 17
- -1 polytetrafluoroethylene Polymers 0.000 description 16
- 239000004814 polyurethane Substances 0.000 description 16
- 229920002635 polyurethane Polymers 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 239000000839 emulsion Substances 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910002804 graphite Inorganic materials 0.000 description 12
- 239000010439 graphite Substances 0.000 description 12
- 229920006324 polyoxymethylene Polymers 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 239000003431 cross linking reagent Substances 0.000 description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 description 9
- 239000011342 resin composition Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 239000004094 surface-active agent Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 238000009472 formulation Methods 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 229920005749 polyurethane resin Polymers 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 5
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 5
- 229920001228 polyisocyanate Polymers 0.000 description 5
- 239000005056 polyisocyanate Substances 0.000 description 5
- 229920002379 silicone rubber Polymers 0.000 description 5
- 239000004945 silicone rubber Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010345 tape casting Methods 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 229910020487 SiO3/2 Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 229920001084 poly(chloroprene) Polymers 0.000 description 4
- 229920006267 polyester film Polymers 0.000 description 4
- 229920005672 polyolefin resin Polymers 0.000 description 4
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 3
- 229910020447 SiO2/2 Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 150000002430 hydrocarbons Chemical group 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 241001590997 Moolgarda engeli Species 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 2
- 229910020388 SiO1/2 Inorganic materials 0.000 description 2
- 229910020485 SiO4/2 Inorganic materials 0.000 description 2
- 229920000180 alkyd Polymers 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- PTTPXKJBFFKCEK-UHFFFAOYSA-N 2-Methyl-4-heptanone Chemical compound CC(C)CC(=O)CC(C)C PTTPXKJBFFKCEK-UHFFFAOYSA-N 0.000 description 1
- 229920005789 ACRONAL® acrylic binder Polymers 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- VBGLYOIFKLUMQG-UHFFFAOYSA-N Cannabinol Chemical class C1=C(C)C=C2C3=C(O)C=C(CCCCC)C=C3OC(C)(C)C2=C1 VBGLYOIFKLUMQG-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 101710136392 Cold shock-like protein CspE Proteins 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 150000001718 carbodiimides Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- PDEDQSAFHNADLV-UHFFFAOYSA-M potassium;disodium;dinitrate;nitrite Chemical compound [Na+].[Na+].[K+].[O-]N=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PDEDQSAFHNADLV-UHFFFAOYSA-M 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/06—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2321/00—Characterised by the use of unspecified rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2400/00—Characterised by the use of unspecified polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
- C10M2209/0845—Acrylate; Methacrylate used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/14—Containing carbon-to-nitrogen double bounds, e.g. guanidines, hydrazones, semicarbazones
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/045—Polyureas; Polyurethanes
- C10M2217/0453—Polyureas; Polyurethanes used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/02—Unspecified siloxanes; Silicones
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/02—Unspecified siloxanes; Silicones
- C10M2229/025—Unspecified siloxanes; Silicones used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/015—Dispersions of solid lubricants
- C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
Definitions
- the present invention relates to a coating composition for a sliding member, and particularly relates to a coating composition for a sliding member whereby low frictional friction can be maintained for an extended period of time, and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented, by forming a film on the sliding member surface.
- Coating compositions are known that include a solid lubricant in order to enhance the sliding characteristics of a base material surface.
- a resin coating material including a resin, a solid lubricant, and silicone-rubber particles has been proposed for the purpose of further enhancing sliding characteristics (Japanese Unexamined Patent Application Publication H08-048800).
- An object of the present invention is to provide a coating composition for a sliding member whereby low frictional drag can be maintained for an extended period of time and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented, by forming a film on the sliding member surface.
- the present invention relates to a coating composition for a sliding member comprising a film-forming organic resin, a solid lubricant, and a silicone resin.
- a coating composition for a sliding member comprising a film-forming organic resin, a solid lubricant, and a silicone resin.
- a silicone resin Preferably, from 30 to 120 parts by weight of the solid lubricant and from 5 to 80 parts by weight of the silicone resin are included per 100 parts by weight of the film-forming organic resin.
- a weight ratio of the silicone resin to the solid lubricant is preferably in a range from 0.1 to 0.8.
- the film-forming organic resin when in the form of an organic resin film having a thickness from 20 to 30 ⁇ m and a width of 10 mm, preferably has a breaking elongation at a pulling speed of 10 mm/minute of not less than 100%.
- the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups, and more preferably, the silicone resin is a silicone resin powder that does not have a softening point.
- the sliding member which is a base material, is preferably rubber.
- the present invention also relates to a coated body provided with a coating film comprising the coating composition for a sliding member described above on a surface thereof. Additionally, the coated body is preferably a rubber member.
- the coating composition of the present invention By forming the coating composition of the present invention on a sliding member surface as a film, low frictional drag can be maintained for an extended period of time and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented. Additionally, the film formed by curing the coating composition of the present invention has excellent flexibility. Thus, even when the film is formed on rubber or a similar flexible base material, the film can follow deformations of the base material without film defects such as peeling, cracking, and the like occurring.
- the film-forming organic resin used in the coating composition of the present invention is not particularly limited, and examples thereof include alkyd resins, polyacrylic resins, polymethacrylic resins, polyurethane resins, epoxy resins, phenolic resins, polyolefin resins, polyamide resins, polyamide imide resins, and other commercially available organic resins.
- film-forming organic resin compositions having alkyd resins, polyacrylic resins, polyurethane resins, epoxy resins, polyolefin resins, or the like as a main component can be suitably used, and film-forming polyurethane resin compositions, film-forming polyacrylic resin compositions, and film-forming polyolefin resin compositions are particularly preferable.
- a single film-forming organic resin can be used or, as necessary, a combination of two or more film-forming organic resins can be used.
- the film-forming polyurethane resin composition may be used in combination with a polyisocyanate, polyamidoamine, aliphatic polyamine, cycloaliphatic polyamine, cycloaliphatic diamine, tertiary amine, carbodiimide, or similar crosslinking agent.
- preferable film-forming polyurethane resin compositions include the Sancure® series (manufactured by Lubrizol Corporation); the Superflex series (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.); the Adeka BONTIGHTER HUX-series (manufactured by Adeka Corporation); the VONDIC series and the HYDRAN HW series (manufactured by DIC Corporation); the NeoRez series (manufactured by Royal DSM N.V.); the TakelacTM W series and TakelacTM WS series (manufactured by Mitsui Chemicals, Inc.); the UCOAT series (manufactured by Sanyo Chemical Industries, Ltd.); the WBR series and the WEM series (manufactured by Taisei Fine Chemical Co., Ltd.); and similar water-based film-forming polyurethane emulsions.
- Sancure® series manufactured by Lubrizol Corporation
- the Superflex series manufactured by Dai-ichi
- film-forming polyurethane resin compositions can, for example, be used in combination with the TakenateTM WD series (manufactured by Mitsui Chemicals, Inc.) or the Carbodilite crosslinking agent series (manufactured by Nisshinbo Holdings Inc.).
- Solvent-based film-forming polyurethane compositions are also suitable, and commercially available examples thereof include combinations of the Nippollan series and the Coronate crosslinking agent series (manufactured by Nippon Polyurethane Industry Co., Ltd.), and combinations of the Adeka BONTIGHTER F series and the HARDENER crosslinking agent series (manufactured by Adeka Corporation).
- Examples of preferable film-forming polyacrylic resin compositions include the VONCOAT series (manufactured by DIC Corporation); the Polysol AP series and the Polysol AM series (manufactured by Showa Denko K.K.); the Aquabrid series (manufactured by Daicel Finechem Ltd.); the Acryset ARL series, the Acryset EMN series, the Acryset EX series, the Acryset SZ series, and the UW E series (manufactured by Nippon Shokubai Co., Ltd.); the Yodosol series and the Cannabinol series (manufactured by Nippon NSC Co.
- preferable film-forming polyolefin resin compositions include the ARROWBASE® series (manufactured by Unitika Ltd.); the HARDLEN® series (manufactured by Toyobo Co., Ltd.); the Hitec S series (manufactured by Toho Chemical Industry Co., Ltd.); and similar water-based film-forming non-chlorinated polyolefin emulsions.
- a breaking elongation of the organic resin film obtained from the film-forming organic resin is preferably not less than 100% and more preferably not less than 200%.
- a reason for this is because when the base material (sliding member) is rubber or a similar flexible material, the film can follow deformations of the base material, and peeling, cracking, and other defects of the cover film can be prevented.
- the breaking elongation of the organic resin film is measured by forming the film-forming organic resin into an organic resin film having a thickness from 20 to 30 ⁇ m and a width of 10 mm, and pulling at a pulling speed of 10 mm/minute.
- a conventionally known solid lubricant can be used as the solid lubricant, and preferable examples thereof include molybdenum disulfide, tungsten disulfide, graphite, PTFE (polytetrafluoroethylene), and the like.
- the particle diameter of the solid lubricant is preferably in a range from 0.1 to 30 ⁇ m and more preferably from 0.2 to 20 ⁇ m.
- the solid lubricant is preferably a graphite.
- the graphite include both natural graphites and artificial graphites, and particles thereof may be squamous, scale-like, or soil-like. Among these, squamous graphite is preferable.
- the squamous graphite that can be preferably used include J-CPB, ACP-1000, and CSP-E (manufactured by Nippon Graphite Industries, Ltd.); UF2 and UF-4 (manufactured by Graphit Kropfmuehl); BF-10A (manufactured by Fuji Kokuen Co., Ltd.); and the like.
- Examples of the molybdenum disulfide include Technical Fine (manufactured by Climax Molybdenum GmbH) and UP-15 (manufactured by Placer Dome Inc.); and examples of the PTFE include L-5 (manufactured by Daikin Industries Ltd.), TF9205 (manufactured by Dyneon), and KTL-8F (manufactured by Kitamura Limited).
- a compounded amount of the solid lubricant is preferably in a range of 30 to 120 parts by weight and more preferably in a range of 50 to 100 parts by weight per 100 parts by weight of the film-forming organic resin. This is because if the compounded amount of the solid lubricant is less than the lower limit of the range described above, sufficient lubrication characteristics may not be obtained; and if the compounded amount of the solid lubricant exceeds the upper limit of the range described above, adhesion of the coating composition of the present invention to the base material may decline and/or the uniformity of the film obtained by curing the coating composition of the present invention may be damaged.
- the silicone resin is a polyorganosiloxane having a crosslinked structure with a three-dimensional network form that has not less than 50 mol % and preferably not less than 70 mol % of branched siloxane units selected from siloxane units expressed by R 1 SiO 3/2 or SiO 4/2 .
- the silicone resin may include siloxane units expressed by R 1 2 SiO 2/2 and siloxane units expressed by R 1 3 SiO 1/2 .
- R 1 in this formula examples include independent monovalent hydrocarbon groups having from 1 to 20 carbons, alkyl groups having from 1 to 20 carbons, aryl groups having from 6 to 20 carbons, aralkyl groups having from 7 to 20 carbons, and alkenyl groups having from 2 to 20 carbons.
- Part or all of the carbon-bonded hydrogen atoms of the monovalent hydrocarbon groups may be substituted monovalent hydrocarbon groups having from 1 to 20 carbons, substituted with halogen atoms, amino groups, epoxy groups, acryloxy groups, methacryloxy groups, mercapto groups, cyano groups, and the like.
- the silicone resin preferably has, on average, from 0.05 to 15 wt. %, and more preferably from 0.5 to 10 wt. % of silicon-bonded hydroxyl groups.
- the silicone resin may be a solid or a liquid at 25° C., and may or may not have a softening temperature. However, the silicone resin preferably is a solid at 25° C. and does not have a softening point. From the perspective of dispersibility, when the silicone resin is a silicone resin powder that is a solid at 25° C. and that does not have a softening point, a median diameter measured using a laser diffraction/scattering type particle size distribution is preferably in a range from 0.1 to 30 ⁇ m and more preferably from 0.2 to 20 ⁇ m.
- the form of the silicone resin powder is not particularly limited and may be flake-like, irregular shape, or spherical.
- a compounded amount of the silicone resin is not particularly limited, but from the perspectives of uniformity of the film obtained from the coating composition of the present invention and sticking to glass and similar smooth surfaces, is preferably from 5 to 80 parts by weight and more preferably from 10 to 40 parts by weight per 100 parts by weight of the film-forming organic resin. Additionally, a compounding ratio of the silicone resin with respect to the solid lubricant is not particularly limited, but from the perspectives of uniformity of the film obtained from the coating composition of the present invention and sticking to glass and similar smooth surfaces, is preferably from 0.1 to 0.8 and more preferably from 0.3 to 0.6 with respect to 1 of the solid lubricant.
- sliding members to which the coating composition of the present invention can be applied include sliding members constituted by natural rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, EPDM (ethylene propylene diene dimer), ethylene propylene rubber, mixtures thereof, and similar rubbers; vinyl chloride, polyurethane, polyamide, mixtures thereof, and similar thermoplastic resins; and similar materials.
- the coating composition of the present invention can be formed by diluting the film-forming organic resin with an appropriate solvent, and then dispersing and mixing the solid lubricant and the silicone resin.
- a bead mill or the like may be used to more finely disperse the solid lubricant and/or the silicone resin.
- fillers, surfactants, thickening agents, preservatives, and the like may be compounded to the extent that the object of the present invention is not obstructed.
- a lubricating coating film can be formed by applying the coating composition of the present invention to the sliding member by spray coating, dipping, roll coating, knife coating, brush coating, or the like, and thereafter drying to form a film.
- the drying and film forming may be conducted by heat treating in a temperature range of about 70 to 180° C.
- a thickness of the coating after the film forming is not particularly limited, but from the perspectives of wear resistance, and followability to the sliding member, is preferably from 2 to 20 ⁇ m and more preferably from 5 to 10 ⁇ m.
- the maximum particle diameter of the particles in the obtained coating composition was measured in accordance with JIS 5600-2-5.
- the coating composition was applied via knife coating at a particle gauge of 100 ⁇ m and dried for 10 minutes at 80° C. Then, the particles of the film surface were visually observed. Cases where only particles having diameters of less than 20 ⁇ m were found were considered “passing”, and cases where particles were found having diameters of 20 ⁇ m or greater were considered “failing”.
- the coating compositions of the Practical Examples and the Comparative Examples were applied to chloroprene rubber sheets and EPDM rubber sheets (thickness: 2 mm) by spraying so that a film thickness would be 10 ⁇ m.
- the coating compositions using a film-forming water-based emulsion were allowed to sit at rest for 30 minutes at 80° C. and the coating compositions using a solvent-based film-forming composition were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours. Thus, samples for the friction test were prepared.
- the coating compositions were applied on polyester films by knife coating.
- the coating compositions using a film-forming water-based emulsion were allowed to sit at rest for 30 minutes at 80° C. and the coating compositions using a solvent-based film-forming composition were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours.
- samples where the coating compositions were applied on polyester film surfaces were obtained by cutting out squares with a length and width of 1 cm. Each of the obtained samples was placed on a glass plate surface so that the coated face was in contact with the glass plate surface, and was allowed to sit for one hour in a 60° C. atmosphere while applying a load of 100 g.
- the glass plate was returned to room temperature and the 100 g load was removed. Thereafter, a weight of 5 g was attached to the sample and allowed to sit at room temperature for five minutes. Then, the glass plate was stood up so as to be vertical, and the time required for the sample and the 5 g weight to peel from the glass surface was measured. Cases where the sample peeled from the glass plate surface within 60 seconds were considered “passing”.
- the coating compositions were applied to EPDM rubber sheets (thickness: 2 mm) by spraying so that a film thickness would be 10 ⁇ m, were allowed to sit at rest for 30 minutes at 80° C. and, thereafter, were allowed to sit at room temperature for not less than 24 hours. Thus, samples were prepared. Using a reciprocating tester, the prepared samples were tested for the coefficient of dynamic friction after 10,000 slides with respect to a glass ball, and whether or not stick-slip occurred. Testing conditions were as follows: Sliding speed: 0.08 m/s; Load: 200 g; Sliding distance (stroke): 60 mm. Moreover, after the test, the sliding site of the sample was examined using a microscope as to whether or not the film had peeled.
- Each film-forming organic resin composition was applied to a chloroprene rubber sheet (thickness: 2 mm) by knife coating so that a film thickness would be 10 ⁇ m.
- the film-forming aqueous polyurethane emulsions were allowed to sit at rest for 30 minutes at 80° C. and the solvent-based film-forming polyurethane compositions were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours. Thus, samples were prepared.
- the organic resin coated face of each obtained sample was mountain-folded to 180°, and a load of 1 kg was applied. After sitting for one hour at 25° C., the appearance of the film at the folding site was visually observed.
- Each film-forming organic resin composition was applied on a polyester film by knife coating.
- the film-forming water-based emulsions were allowed to sit at rest for 30 minutes at 80° C. and the solvent-based film-forming compositions were allowed to sit at rest for 30 minutes at 120° C. Thereafter, organic resin films having a thickness from 20 to 30 ⁇ m were obtained by peeling the cured film from the polyester film.
- the obtained organic resin films were formed into strips having a width of 10 mm, and breaking elongation when stretched at a pulling speed of 10 mm/minute was measured.
- the film-forming organic resins shown in Table 1 are described below.
- Binder A Film-forming aqueous ester-based polyurethane emulsion (solid content: 48%, viscosity: 500 mPa ⁇ s)
- Binder B Film-forming water-based carbonate-based polyurethane emulsion (solid content: 42%, viscosity: 200 mPa ⁇ s)
- Binder C Film-forming solvent-based ester-based polyurethane composition (solid content: 20%, viscosity: 19,000 mPa ⁇ s)
- Binder D Film-forming water-based ester-based polyurethane emulsion (solid content: 34%, viscosity: 200 mPa ⁇ s)
- Binder E Film-forming solvent-based ester-based polyurethane composition (solid content: 70%, viscosity: 4,600 mPa ⁇ s)
- Binder F Mixture of Binder A and Binder D at a 1:1 ratio (film-forming water-based ester-based polyurethane emulsion) (solid content: 40%,
- the film-forming organic resin and ion exchanged water were mixed at the compounding ratios shown in Tables 2 to 5. Then, a solid lubricant, a silicone component, and a surfactant were added at the compounding ratios shown in Tables 2 to 5 while stirring. Glass beads having a diameter of 2 mm were added to the obtained mixture, the mixture was then mixed for 30 minutes at 1,200 rpm using a propeller mixer and, thereafter, the glass beads were removed. Thus, the coating composition was obtained. Uniformity of the obtained coating composition was evaluated; and the dynamic coefficient of friction, occurrence of stick-slip, and sticking of the object covered with the coating composition to glass were evaluated. These results are shown in Tables 6 to 9.
- the film-forming organic resin, a solvent, and a crosslinking agent were mixed at the compounding ratios shown in Tables 2 to 4. Then, a solid lubricant, a silicone component, and a surfactant were added at the compounding ratios shown in Tables 2 to 4 while stirring. Thus, the coating composition was obtained. Uniformity of the obtained coating composition was evaluated; and the dynamic coefficient of friction, occurrence of stick-slip, and sticking of the object covered with the coating composition to glass were evaluated. These results are shown in Tables 6 to 8.
- Binder A 100 100 100 0 100 0 organic resin Binder B 0 0 0 0 0 100 (solid content) Binder C 0 0 0 100 0 0 100 0 0 Crosslinking Coronate L 0 0 0 12 0 0 agent (solid content) Solid lubricant Graphite 77 56 98 79 35 77 Molybdenum 0 0 0 0 0 0 disulfide PTFE powder 0 0 0 0 0 0 Silicone Silicone resin 23 33 10 23 10 23 component powder Surfactant 67 additive 6 6 6 0 4 6 Solvent Distilled water 902 860 963 0 654 902 Methyl 0 0 0 0 0 0 isobutyl ketone Ethyl acetate 0 0 0 898 0 0 Silicone resin/Solid 0.30 0.59 0.11 0.29 0.29 0.30 lubricant ratio
- Binder A 100 100 100 0 100 100 100 organic resin Binder C 0 0 0 100 0 0 (solid content) Crosslinking agent Coronate L 0 0 0 12 0 0 (solid content) Solid lubricant Graphite 77 56 98 79 117 0 Molybdenum 0 0 0 0 0 0 0 disulfide PTFE powder 0 0 0 0 0 0 0 Silicone component Silicone resin 0 0 0 0 0 67 powder Silicone rubber 23 33 10 23 0 0 powder Surfactant 67 additive 6 6 6 0 6 4 Solvent Distilled water 902 860 944 0 975 754 Methyl isobutyl 0 0 0 0 0 0 ketone Ethyl acetate 0 0 0 898 0 0 Silicone resin/Solid lubricant ratio 0 0 0 0 0 —
- Binder A 100 100 100 0 organic resin Binder F 0 0 0 100 Solid lubricant Graphite 0 19 77 77 Molybdenum 0 0 0 0 disulfide PTFE powder 0 0 0 0 Silicone component Silicone resin 0 0 0 0 powder Silicone rubber 67 0 0 23 powder Surfactant 67 additive 4 6 6 6 Solvent Distilled water 754 540 902 850 Methyl isobutyl 0 0 0 0 ketone Ethyl acetate 0 0 0 0 Silicone resin/Solid lubricant ratio — 0 0 0 0
- Binders A to C and F to H As described above. Coronate L: Polyisocyanate-based crosslinking agent (contains 25% ethyl acetate as a solvent)
- Graphite Squamous graphite having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 to 5 ⁇ m.
- Molybdenum disulfide Molybdenum disulfide fine powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 to 6 ⁇ m.
- PTFE powder Polytetrafluoroethylene resin powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 2 to 4 ⁇ m.
- Silicone resin powder Irregular shape silicone resin powder constituted by siloxane units expressed by (CH 3 )SiO 3/2 , having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 ⁇ m, and not having a softening point. Silicon-bonded hydroxyl groups content: 5%; Specific gravity: 1.33. Silicone resin: Silicone resin expressed by the average unit formula ((CH 3 )SiO 3/2 ) 0.86 ((CH 3 ) 2 SiO 2/2 ) 0.14 , having a glass transition temperature of 0° C. Silicon-bonded hydroxyl groups content: about 1%; Specific gravity: 1.05.
- Silicone rubber powder A spherical silicone rubber powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 2 ⁇ m, obtained by crosslinking a polydimethyl siloxane via a condensation reaction. Specific gravity: 0.98. 67 additive: (tradename) manufactured by Dow Corning Toray Co., Ltd. CR: Chloroprene rubber (crosslinked product; Purchased from Kanda Gomu Kagaku Corporation) EPDM: Crosslinked product of an ethylene propylene diene monomer (purchased from Kanda Gomu Kagaku Corporation) POM: Polyacetal resin
- silicone resin/solid lubricant ratio indicates the quotient of the parts of the silicone resin powder and silicone resin with respect to 100 parts of the film-forming organic resin (solid content) in each coating composition, divided by the parts of the solid lubricant.
- the coating composition of the present invention can be suitably used as a surface coating on weather strips of vehicle openings, vehicle wiper blade rubber, weather seals, glass runs, and similar sliding members because a film formed by curing the coating composition maintains a low frictional drag over an extended period of time, and because sticking to glass, metal coated surfaces, and similar smooth surfaces can be prevented.
- the coating composition of the present invention can be suitably used for treating O-rings, gaskets, various types of packings, and other sealing members; and also sliding sites of surfaces of rubber hoses.
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Abstract
A coating composition for a sliding member, wherein from 30 to 120 parts by weight of a solid lubricant and from 5 to 80 parts by weight of a silicone resin are included per 100 parts by weight of a film-forming organic resin. As a result of forming the film on the surface of the sliding member, a coating composition for a sliding member is provided whereby low frictional drag can be maintained for an extended period of time, and the sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented.
Description
- The present invention relates to a coating composition for a sliding member, and particularly relates to a coating composition for a sliding member whereby low frictional friction can be maintained for an extended period of time, and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented, by forming a film on the sliding member surface.
- Coating compositions are known that include a solid lubricant in order to enhance the sliding characteristics of a base material surface. However, in many cases, enhancements of sliding characteristics have been insufficient with regards to sliding members constituted by rubber or plastic. Thus, a resin coating material including a resin, a solid lubricant, and silicone-rubber particles has been proposed for the purpose of further enhancing sliding characteristics (Japanese Unexamined Patent Application Publication H08-048800).
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- Patent Document 1: Japanese Unexamined Patent Application Publication H08-048800
- However, when using an organic resin that forms a pliable film as a binder in an effort to enhance the followability to rubber, soft plastic, or a similar flexible base material, problems were discovered, namely that a sliding member coated with a coating composition such as that described above easily sticks to glass and similar smooth surfaces, and that the coefficient of friction at sliding initiation increases.
- An object of the present invention is to provide a coating composition for a sliding member whereby low frictional drag can be maintained for an extended period of time and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented, by forming a film on the sliding member surface.
- The present invention relates to a coating composition for a sliding member comprising a film-forming organic resin, a solid lubricant, and a silicone resin. Preferably, from 30 to 120 parts by weight of the solid lubricant and from 5 to 80 parts by weight of the silicone resin are included per 100 parts by weight of the film-forming organic resin. A weight ratio of the silicone resin to the solid lubricant is preferably in a range from 0.1 to 0.8.
- The film-forming organic resin, when in the form of an organic resin film having a thickness from 20 to 30 μm and a width of 10 mm, preferably has a breaking elongation at a pulling speed of 10 mm/minute of not less than 100%.
- Preferably, the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups, and more preferably, the silicone resin is a silicone resin powder that does not have a softening point. Additionally, the sliding member, which is a base material, is preferably rubber.
- The present invention also relates to a coated body provided with a coating film comprising the coating composition for a sliding member described above on a surface thereof. Additionally, the coated body is preferably a rubber member.
- By forming the coating composition of the present invention on a sliding member surface as a film, low frictional drag can be maintained for an extended period of time and sticking of the sliding member to glass surfaces and similar smooth surfaces can be prevented. Additionally, the film formed by curing the coating composition of the present invention has excellent flexibility. Thus, even when the film is formed on rubber or a similar flexible base material, the film can follow deformations of the base material without film defects such as peeling, cracking, and the like occurring.
- The film-forming organic resin used in the coating composition of the present invention is not particularly limited, and examples thereof include alkyd resins, polyacrylic resins, polymethacrylic resins, polyurethane resins, epoxy resins, phenolic resins, polyolefin resins, polyamide resins, polyamide imide resins, and other commercially available organic resins. Among these, film-forming organic resin compositions having alkyd resins, polyacrylic resins, polyurethane resins, epoxy resins, polyolefin resins, or the like as a main component can be suitably used, and film-forming polyurethane resin compositions, film-forming polyacrylic resin compositions, and film-forming polyolefin resin compositions are particularly preferable. A single film-forming organic resin can be used or, as necessary, a combination of two or more film-forming organic resins can be used.
- As necessary, the film-forming polyurethane resin composition may be used in combination with a polyisocyanate, polyamidoamine, aliphatic polyamine, cycloaliphatic polyamine, cycloaliphatic diamine, tertiary amine, carbodiimide, or similar crosslinking agent.
- Examples of preferable film-forming polyurethane resin compositions include the Sancure® series (manufactured by Lubrizol Corporation); the Superflex series (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.); the Adeka BONTIGHTER HUX-series (manufactured by Adeka Corporation); the VONDIC series and the HYDRAN HW series (manufactured by DIC Corporation); the NeoRez series (manufactured by Royal DSM N.V.); the Takelac™ W series and Takelac™ WS series (manufactured by Mitsui Chemicals, Inc.); the UCOAT series (manufactured by Sanyo Chemical Industries, Ltd.); the WBR series and the WEM series (manufactured by Taisei Fine Chemical Co., Ltd.); and similar water-based film-forming polyurethane emulsions. These film-forming polyurethane resin compositions can, for example, be used in combination with the Takenate™ WD series (manufactured by Mitsui Chemicals, Inc.) or the Carbodilite crosslinking agent series (manufactured by Nisshinbo Holdings Inc.).
- Solvent-based film-forming polyurethane compositions are also suitable, and commercially available examples thereof include combinations of the Nippollan series and the Coronate crosslinking agent series (manufactured by Nippon Polyurethane Industry Co., Ltd.), and combinations of the Adeka BONTIGHTER F series and the HARDENER crosslinking agent series (manufactured by Adeka Corporation).
- Examples of preferable film-forming polyacrylic resin compositions include the VONCOAT series (manufactured by DIC Corporation); the Polysol AP series and the Polysol AM series (manufactured by Showa Denko K.K.); the Aquabrid series (manufactured by Daicel Finechem Ltd.); the Acryset ARL series, the Acryset EMN series, the Acryset EX series, the Acryset SZ series, and the UW E series (manufactured by Nippon Shokubai Co., Ltd.); the Yodosol series and the Cannabinol series (manufactured by Nippon NSC Co. Ltd.); the Polytron™ series and the Polydurex™ series (manufactured by Asahi Kasei Chemicals Corporation); the Rikabond ES series (commercially available products manufactured by CSC Co., Ltd.); the Primal™ series (commercially available products manufactured by Rohm and Haas Company Japan Co., Ltd.); the Acronal® series (manufactured by BASF Japan Co., Ltd.); Movinyl (commercially available product manufactured by Nichigo-Movinyl Co., Ltd.); Kaneka Gemlac™ and Kanevilack™ (commercially available products manufactured by Kaneka Corporation); the SE series, UW series, RKW series, and AKW series (manufactured by Taisei Fine Chemical Co., Ltd.); and similar water-based film-forming acrylic resin emulsions.
- Examples of preferable film-forming polyolefin resin compositions include the ARROWBASE® series (manufactured by Unitika Ltd.); the HARDLEN® series (manufactured by Toyobo Co., Ltd.); the Hitec S series (manufactured by Toho Chemical Industry Co., Ltd.); and similar water-based film-forming non-chlorinated polyolefin emulsions.
- A breaking elongation of the organic resin film obtained from the film-forming organic resin is preferably not less than 100% and more preferably not less than 200%. A reason for this is because when the base material (sliding member) is rubber or a similar flexible material, the film can follow deformations of the base material, and peeling, cracking, and other defects of the cover film can be prevented. Note that the breaking elongation of the organic resin film is measured by forming the film-forming organic resin into an organic resin film having a thickness from 20 to 30 μm and a width of 10 mm, and pulling at a pulling speed of 10 mm/minute.
- A conventionally known solid lubricant can be used as the solid lubricant, and preferable examples thereof include molybdenum disulfide, tungsten disulfide, graphite, PTFE (polytetrafluoroethylene), and the like. The particle diameter of the solid lubricant, as a median diameter measured using a laser diffraction/scattering type particle size distribution, is preferably in a range from 0.1 to 30 μm and more preferably from 0.2 to 20 μm. This is because if the particle diameter of the solid lubricant is less than the lower limit of the range described above, excellent lubrication durability may not be obtained; and if the particle diameter exceeds the upper limit of the range described above, the surface roughness of the film obtained by curing the coating composition of the present invention will increase and the film may become prone to wearing when sliding.
- The solid lubricant is preferably a graphite. Examples of the graphite include both natural graphites and artificial graphites, and particles thereof may be squamous, scale-like, or soil-like. Among these, squamous graphite is preferable. Examples of the squamous graphite that can be preferably used include J-CPB, ACP-1000, and CSP-E (manufactured by Nippon Graphite Industries, Ltd.); UF2 and UF-4 (manufactured by Graphit Kropfmuehl); BF-10A (manufactured by Fuji Kokuen Co., Ltd.); and the like. Examples of the molybdenum disulfide include Technical Fine (manufactured by Climax Molybdenum GmbH) and UP-15 (manufactured by Placer Dome Inc.); and examples of the PTFE include L-5 (manufactured by Daikin Industries Ltd.), TF9205 (manufactured by Dyneon), and KTL-8F (manufactured by Kitamura Limited).
- A compounded amount of the solid lubricant is preferably in a range of 30 to 120 parts by weight and more preferably in a range of 50 to 100 parts by weight per 100 parts by weight of the film-forming organic resin. This is because if the compounded amount of the solid lubricant is less than the lower limit of the range described above, sufficient lubrication characteristics may not be obtained; and if the compounded amount of the solid lubricant exceeds the upper limit of the range described above, adhesion of the coating composition of the present invention to the base material may decline and/or the uniformity of the film obtained by curing the coating composition of the present invention may be damaged.
- The silicone resin is a polyorganosiloxane having a crosslinked structure with a three-dimensional network form that has not less than 50 mol % and preferably not less than 70 mol % of branched siloxane units selected from siloxane units expressed by R1SiO3/2 or SiO4/2. The silicone resin may include siloxane units expressed by R1 2SiO2/2 and siloxane units expressed by R1 3SiO1/2.
- When using a polyorganosiloxane having less than 50 mol % of branched siloxane units selected from siloxane units expressed by R1SiO3/2 or SiO4/2 in place of the silicone resin described above or, more specifically, when using a polydiorganosiloxane constituted by siloxane units expressed by R1 2SiO2/2 and siloxane units expressed by R1 3SiO1/2 and a crosslinked product thereof in place of the silicone resin described above, it was discovered that the sliding member on which such a coating composition is applied stuck to glass and similar smooth surfaces.
- Examples of R1 in this formula include independent monovalent hydrocarbon groups having from 1 to 20 carbons, alkyl groups having from 1 to 20 carbons, aryl groups having from 6 to 20 carbons, aralkyl groups having from 7 to 20 carbons, and alkenyl groups having from 2 to 20 carbons. Part or all of the carbon-bonded hydrogen atoms of the monovalent hydrocarbon groups may be substituted monovalent hydrocarbon groups having from 1 to 20 carbons, substituted with halogen atoms, amino groups, epoxy groups, acryloxy groups, methacryloxy groups, mercapto groups, cyano groups, and the like. Among these, alkyl groups, fluoroalkyl groups, and aryl groups are preferable, and methyl groups and phenyl groups are more preferable. Moreover, the silicone resin preferably has, on average, from 0.05 to 15 wt. %, and more preferably from 0.5 to 10 wt. % of silicon-bonded hydroxyl groups.
- The silicone resin may be a solid or a liquid at 25° C., and may or may not have a softening temperature. However, the silicone resin preferably is a solid at 25° C. and does not have a softening point. From the perspective of dispersibility, when the silicone resin is a silicone resin powder that is a solid at 25° C. and that does not have a softening point, a median diameter measured using a laser diffraction/scattering type particle size distribution is preferably in a range from 0.1 to 30 μm and more preferably from 0.2 to 20 μm. The form of the silicone resin powder is not particularly limited and may be flake-like, irregular shape, or spherical.
- A compounded amount of the silicone resin is not particularly limited, but from the perspectives of uniformity of the film obtained from the coating composition of the present invention and sticking to glass and similar smooth surfaces, is preferably from 5 to 80 parts by weight and more preferably from 10 to 40 parts by weight per 100 parts by weight of the film-forming organic resin. Additionally, a compounding ratio of the silicone resin with respect to the solid lubricant is not particularly limited, but from the perspectives of uniformity of the film obtained from the coating composition of the present invention and sticking to glass and similar smooth surfaces, is preferably from 0.1 to 0.8 and more preferably from 0.3 to 0.6 with respect to 1 of the solid lubricant.
- Examples of sliding members to which the coating composition of the present invention can be applied include sliding members constituted by natural rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, EPDM (ethylene propylene diene dimer), ethylene propylene rubber, mixtures thereof, and similar rubbers; vinyl chloride, polyurethane, polyamide, mixtures thereof, and similar thermoplastic resins; and similar materials.
- The coating composition of the present invention can be formed by diluting the film-forming organic resin with an appropriate solvent, and then dispersing and mixing the solid lubricant and the silicone resin. A bead mill or the like may be used to more finely disperse the solid lubricant and/or the silicone resin. Moreover, fillers, surfactants, thickening agents, preservatives, and the like may be compounded to the extent that the object of the present invention is not obstructed.
- A lubricating coating film can be formed by applying the coating composition of the present invention to the sliding member by spray coating, dipping, roll coating, knife coating, brush coating, or the like, and thereafter drying to form a film. The drying and film forming may be conducted by heat treating in a temperature range of about 70 to 180° C. A thickness of the coating after the film forming is not particularly limited, but from the perspectives of wear resistance, and followability to the sliding member, is preferably from 2 to 20 μm and more preferably from 5 to 10 μm.
- Hereinafter, the present invention will be described in detail using Practical Examples and Comparative Examples, but the present invention is not limited to these Practical Examples and Comparative Examples. In the Practical Examples, “parts” are defined as parts by weight, “percentages (%)” are defined as wt. %, and “viscosity” is defined as a measurement taken at 25° C.
- Methods for evaluating the examples are described below.
- The maximum particle diameter of the particles in the obtained coating composition was measured in accordance with JIS 5600-2-5. The coating composition was applied via knife coating at a particle gauge of 100 μm and dried for 10 minutes at 80° C. Then, the particles of the film surface were visually observed. Cases where only particles having diameters of less than 20 μm were found were considered “passing”, and cases where particles were found having diameters of 20 μm or greater were considered “failing”.
- Sliding Friction Test
- The coating compositions of the Practical Examples and the Comparative Examples were applied to chloroprene rubber sheets and EPDM rubber sheets (thickness: 2 mm) by spraying so that a film thickness would be 10 μm. The coating compositions using a film-forming water-based emulsion were allowed to sit at rest for 30 minutes at 80° C. and the coating compositions using a solvent-based film-forming composition were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours. Thus, samples for the friction test were prepared. Using a reciprocating tester, the samples were tested for the coefficients of dynamic friction after 1,000 slides with respect to a ½ inch steel ball, a polyacetal (POM) ball, and a glass ball, and whether or not stick-slip occurred. Testing conditions were as follows: Sliding speed: 0.04 m/s; Load: 50 g; Sliding distance (stroke): 40 mm.
- Evaluation of Sticking to Glass
- The coating compositions were applied on polyester films by knife coating. The coating compositions using a film-forming water-based emulsion were allowed to sit at rest for 30 minutes at 80° C. and the coating compositions using a solvent-based film-forming composition were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours. Then, samples where the coating compositions were applied on polyester film surfaces were obtained by cutting out squares with a length and width of 1 cm. Each of the obtained samples was placed on a glass plate surface so that the coated face was in contact with the glass plate surface, and was allowed to sit for one hour in a 60° C. atmosphere while applying a load of 100 g. Then, the glass plate was returned to room temperature and the 100 g load was removed. Thereafter, a weight of 5 g was attached to the sample and allowed to sit at room temperature for five minutes. Then, the glass plate was stood up so as to be vertical, and the time required for the sample and the 5 g weight to peel from the glass surface was measured. Cases where the sample peeled from the glass plate surface within 60 seconds were considered “passing”.
- Sliding Durability Test with Respect to Glass Ball
- The coating compositions were applied to EPDM rubber sheets (thickness: 2 mm) by spraying so that a film thickness would be 10 μm, were allowed to sit at rest for 30 minutes at 80° C. and, thereafter, were allowed to sit at room temperature for not less than 24 hours. Thus, samples were prepared. Using a reciprocating tester, the prepared samples were tested for the coefficient of dynamic friction after 10,000 slides with respect to a glass ball, and whether or not stick-slip occurred. Testing conditions were as follows: Sliding speed: 0.08 m/s; Load: 200 g; Sliding distance (stroke): 60 mm. Moreover, after the test, the sliding site of the sample was examined using a microscope as to whether or not the film had peeled.
- Each film-forming organic resin composition was applied to a chloroprene rubber sheet (thickness: 2 mm) by knife coating so that a film thickness would be 10 μm. The film-forming aqueous polyurethane emulsions were allowed to sit at rest for 30 minutes at 80° C. and the solvent-based film-forming polyurethane compositions were allowed to sit at rest for 30 minutes at 120° C. Thereafter, each was allowed to sit at room temperature for not less than 24 hours. Thus, samples were prepared. The organic resin coated face of each obtained sample was mountain-folded to 180°, and a load of 1 kg was applied. After sitting for one hour at 25° C., the appearance of the film at the folding site was visually observed. Note that for the solvent-based film-forming polyurethane compositions, a mixture was used comprising 2 parts of a polyisocyanate-based crosslinking agent (Coronate L) per 100 parts of the polyurethane composition. Evaluation results are shown in Table 1.
- Evaluation of Elongation of the Film-Forming Organic Resin
- Each film-forming organic resin composition was applied on a polyester film by knife coating. The film-forming water-based emulsions were allowed to sit at rest for 30 minutes at 80° C. and the solvent-based film-forming compositions were allowed to sit at rest for 30 minutes at 120° C. Thereafter, organic resin films having a thickness from 20 to 30 μm were obtained by peeling the cured film from the polyester film. The obtained organic resin films were formed into strips having a width of 10 mm, and breaking elongation when stretched at a pulling speed of 10 mm/minute was measured. Note that for the solvent-based film-forming polyurethane compositions, a mixture was used comprising 2 parts of a polyisocyanate-based cros slinking agent (Coronate L) per 100 parts of the polyurethane composition. Evaluation results are shown in Table 1.
-
TABLE 1 Elongation Flexibility (%) Binder A No problems 1400 Binder B No problems 690 Binder C No problems 850 Binder D White turbidity 60 and cracking observed Binder E White turbidity 10 and cracking observed Binder F No problems 250 Binder G No problems 950 Binder H No problems 1200 - The film-forming organic resins shown in Table 1 are described below.
- Binder A: Film-forming aqueous ester-based polyurethane emulsion (solid content: 48%, viscosity: 500 mPa·s)
Binder B: Film-forming water-based carbonate-based polyurethane emulsion (solid content: 42%, viscosity: 200 mPa·s)
Binder C: Film-forming solvent-based ester-based polyurethane composition (solid content: 20%, viscosity: 19,000 mPa·s)
Binder D: Film-forming water-based ester-based polyurethane emulsion (solid content: 34%, viscosity: 200 mPa·s)
Binder E: Film-forming solvent-based ester-based polyurethane composition (solid content: 70%, viscosity: 4,600 mPa·s)
Binder F: Mixture of Binder A and Binder D at a 1:1 ratio (film-forming water-based ester-based polyurethane emulsion) (solid content: 40%, viscosity: 320 mPa·s)
Binder G: Film-forming water-based polyacrylic resin emulsion (solid content: 60%, viscosity: 500 mPa·s)
Binder H: Film-forming water-based polyolefin emulsion (solid content: 32%, viscosity: 200 mPa·s)
Coronate L: Polyisocyanate-based crosslinking agent (contains 25% ethyl acetate as a solvent) - The film-forming organic resin and ion exchanged water were mixed at the compounding ratios shown in Tables 2 to 5. Then, a solid lubricant, a silicone component, and a surfactant were added at the compounding ratios shown in Tables 2 to 5 while stirring. Glass beads having a diameter of 2 mm were added to the obtained mixture, the mixture was then mixed for 30 minutes at 1,200 rpm using a propeller mixer and, thereafter, the glass beads were removed. Thus, the coating composition was obtained. Uniformity of the obtained coating composition was evaluated; and the dynamic coefficient of friction, occurrence of stick-slip, and sticking of the object covered with the coating composition to glass were evaluated. These results are shown in Tables 6 to 9.
- The film-forming organic resin, a solvent, and a crosslinking agent were mixed at the compounding ratios shown in Tables 2 to 4. Then, a solid lubricant, a silicone component, and a surfactant were added at the compounding ratios shown in Tables 2 to 4 while stirring. Thus, the coating composition was obtained. Uniformity of the obtained coating composition was evaluated; and the dynamic coefficient of friction, occurrence of stick-slip, and sticking of the object covered with the coating composition to glass were evaluated. These results are shown in Tables 6 to 8.
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Practical Example 1 of Table 2, it was found that a low dynamic coefficient of friction of 0.42 with respect to the glass ball was maintained even after sliding 10,000 times, and that no peeling of the film of the sliding part was observed. Moreover, stick-slip did not occur during sliding.
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Practical Example 4 of Table 2, it was found that a low dynamic coefficient of friction of 0.56 with respect to the glass ball was maintained even after sliding 10,000 times, and that no peeling of the film of the sliding part was observed. Moreover, stick-slip did not occur during sliding.
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Practical Example 12 of Table 3, it was found that a low dynamic coefficient of friction of 0.30 with respect to the glass ball was maintained even after sliding 10,000 times, and that no peeling of the film of the sliding part was observed. Moreover, stick-slip did not occur during sliding. cl Comparative Example 11
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Comparative Example 1 of Table 4, it was found that the dynamic coefficient of friction increased to 0.58 with respect to the glass ball after sliding 10,000 times, and that partial peeling of the film of the sliding part was observed. Note that, however, stick-slip did not occur during sliding. cl Comparative Example 12
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Comparative Example 4 of Table 4, it was found that the dynamic coefficient of friction increased to 0.89 with respect to the glass ball after sliding 10,000 times, and that partial peeling of the film of the sliding part was observed. Note that, however, stick-slip did not occur during sliding.
- As a result of testing the sliding durability of the object covered with the coating composition having the formulation shown in Comparative Example 10 of Table 5, it was found that the dynamic coefficient of friction increased to 0.59 with respect to the glass ball after sliding 10,000 times, and that partial peeling of the film of the sliding part was observed. Moreover, stick-slip occurred during sliding.
-
TABLE 2 Practical Examples 1 2 3 4 5 6 Film-forming Binder A 100 100 100 0 100 0 organic resin Binder B 0 0 0 0 0 100 (solid content) Binder C 0 0 0 100 0 0 Crosslinking Coronate L 0 0 0 12 0 0 agent (solid content) Solid lubricant Graphite 77 56 98 79 35 77 Molybdenum 0 0 0 0 0 0 disulfide PTFE powder 0 0 0 0 0 0 Silicone Silicone resin 23 33 10 23 10 23 component powder Surfactant 67 additive 6 6 6 0 4 6 Solvent Distilled water 902 860 963 0 654 902 Methyl 0 0 0 0 0 0 isobutyl ketone Ethyl acetate 0 0 0 898 0 0 Silicone resin/Solid 0.30 0.59 0.11 0.29 0.29 0.30 lubricant ratio -
TABLE 3 Practical Examples 7 8 9 10 11 12 13 14 Film- Binder A 100 100 0 0 100 0 0 30 forming Binder B 0 0 0 0 0 0 0 0 organic Binder C 0 0 100 100 0 0 0 0 resin Binder F 0 0 0 0 0 100 0 0 Binder G 0 0 0 0 0 0 100 0 Binder H 0 0 0 0 0 0 0 70 Crosslinking Coronate L 0 0 12 12 0 0 0 0 agent (solid content) Solid Graphite 106 0 0 79 117 77 77 77 lubricant Molybdenum disulfide 0 42 0 0 0 0 0 0 PTFE powder 0 0 79 0 0 0 0 0 Silicone Silicone resin powder 29 10 23 0 23 23 23 23 component Silicone resin 0 0 0 23 0 0 0 0 Surfactant 67 additive 6 6 0 0 6 6 6 6 Solvent Distilled water 1060 733 0 0 975 850 1128 750 Methyl isobutyl ketone 0 0 233 0 0 0 0 0 Ethyl acetate 0 0 642 874 0 0 0 0 Silicone resin/Solid lubricant ratio 0.27 0.25 0.29 0.29 0.2 0.3 0.3 0.3 -
TABLE 4 Comparative Examples 1 2 3 4 5 6 Film-forming Binder A 100 100 100 0 100 100 organic resin Binder C 0 0 0 100 0 0 (solid content) Crosslinking agent Coronate L 0 0 0 12 0 0 (solid content) Solid lubricant Graphite 77 56 98 79 117 0 Molybdenum 0 0 0 0 0 0 disulfide PTFE powder 0 0 0 0 0 0 Silicone component Silicone resin 0 0 0 0 0 67 powder Silicone rubber 23 33 10 23 0 0 powder Surfactant 67 additive 6 6 6 0 6 4 Solvent Distilled water 902 860 944 0 975 754 Methyl isobutyl 0 0 0 0 0 0 ketone Ethyl acetate 0 0 0 898 0 0 Silicone resin/Solid lubricant ratio 0 0 0 0 0 — -
TABLE 5 Comparative Examples 7 8 9 10 Film-forming Binder A 100 100 100 0 organic resin Binder F 0 0 0 100 Solid lubricant Graphite 0 19 77 77 Molybdenum 0 0 0 0 disulfide PTFE powder 0 0 0 0 Silicone component Silicone resin 0 0 0 0 powder Silicone rubber 67 0 0 23 powder Surfactant 67 additive 4 6 6 6 Solvent Distilled water 754 540 902 850 Methyl isobutyl 0 0 0 0 ketone Ethyl acetate 0 0 0 0 Silicone resin/Solid lubricant ratio — 0 0 0 -
TABLE 6 Base Sliding Practical Examples material material 1 2 3 4 5 6 CR Steel Coefficient of friction 0.26 0.59 0.31 0.58 0.32 0.34 ball Stick-slip None None None None None None CR POM Coefficient of friction 0.28 0.25 0.25 0.31 0.3 0.26 Stick-slip None None None None None None CR Glass Coefficient of friction 0.34 0.65 0.56 0.59 0.56 0.35 Stick-slip None None None None None None EPDM Steel Coefficient of friction 0.38 0.59 0.44 0.54 0.48 0.35 ball Stick-slip None None None None None None EPDM POM Coefficient of friction 0.28 0.26 0.35 0.27 0.35 0.27 Stick-slip None None None None None None EPDM Glass Coefficient of friction 0.51 0.57 0.52 0.6 0.54 0.41 Stick-slip None None None None None None Coating dispersibility Pass Pass Pass Pass Pass Pass Glass sticking (seconds) 0 0 32 0 0 0 -
TABLE 7 Base Sliding Practical Examples material material 7 8 9 10 11 12 13 14 CR Steel Coefficient of 0.41 0.31 0.32 0.53 0.27 0.25 0.24 0.18 ball friction Stick-slip None None None None None None None None CR POM Coefficient of 0.24 0.29 0.23 0.29 0.27 0.18 0.2 0.15 friction Stick-slip None None None None None None None None CR Glass Coefficient of 0.51 0.41 0.39 0.56 0.41 0.22 0.26 0.2 friction Stick-slip None None None None None None None None EPDM Steel Coefficient of 0.41 0.41 0.26 0.22 0.39 0.23 0.22 0.2 ball friction Stick-slip None None None None None None None None EPDM POM Coefficient of 0.28 0.35 0.28 0.34 0.25 0.15 0.25 0.19 friction Stick-slip None None None None None None None None EPDM Glass Coefficient of 0.51 0.45 0.37 0.59 0.39 0.21 0.18 0.23 friction Stick-slip None None None None None None None None Coating dispersibility Pass Pass Pass Pass Pass Pass Pass Pass Glass sticking (seconds) 0 0 0 0 0 0 0 0 -
TABLE 8 Base Sliding Comparative Examples material material 1 2 3 4 5 6 CR Steel Coefficient of friction 0.44 0.48 0.46 0.55 0.5 0.25 ball Stick-slip None None None None None Occurred CR POM Coefficient of friction 0.35 0.38 0.48 0.45 0.42 0.29 Stick-slip None None None None None None CR Glass Coefficient of friction 0.41 0.52 0.52 0.51 0.65 0.42 Stick-slip None None None None None None EPDM Steel Coefficient of friction 0.36 0.5 0.7 0.51 0.34 0.25 ball Stick-slip None None None None None Occurred EPDM POM Coefficient of friction 0.35 0.4 0.29 0.29 0.38 0.24 Stick-slip None None None None None None EPDM Glass Coefficient of friction 0.38 0.57 0.79 0.49 0.52 0.39 Stick-slip None None None None None None Coating dispersibility Pass Pass Pass Pass Pass Pass Glass sticking (seconds) >300 >300 >300 >300 >300 0 -
TABLE 9 Base Sliding Comparative Examples material material 7 8 9 10 CR Steel Coefficient 0.78 0.95 0.53 0.43 ball of friction Stick-slip Occurred Occurred None Occurred CR POM Coefficient 0.65 0.53 0.48 0.26 of friction Stick-slip Occurred None None None CR Glass Coefficient 1.5 1.26 0.59 0.45 of friction Stick-slip Occurred Occurred None Occurred EPDM Steel Coefficient 0.48 0.63 0.49 0.46 ball of friction Stick-slip Occurred Occurred None Occurred EPDM POM Coefficient 0.65 0.56 0.42 0.23 of friction Stick-slip Occurred None None None EPDM Glass Coefficient 1.22 1.14 0.54 0.43 of friction Stick-slip Occurred Occurred None Occurred Coating dispersibility Pass Pass Pass Pass Glass sticking (seconds) >300 >300 >300 >300 - The terminology used in Tables 2 to 9 is explained below.
- Binders A to C and F to H: As described above.
Coronate L: Polyisocyanate-based crosslinking agent (contains 25% ethyl acetate as a solvent)
Graphite: Squamous graphite having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 to 5 μm.
Molybdenum disulfide: Molybdenum disulfide fine powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 to 6 μm.
PTFE powder: Polytetrafluoroethylene resin powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 2 to 4 μm.
Silicone resin powder: Irregular shape silicone resin powder constituted by siloxane units expressed by (CH3)SiO3/2, having a median diameter measured using a laser diffraction/scattering type particle size distribution of 3 μm, and not having a softening point. Silicon-bonded hydroxyl groups content: 5%; Specific gravity: 1.33.
Silicone resin: Silicone resin expressed by the average unit formula ((CH3)SiO3/2)0.86((CH3)2SiO2/2)0.14, having a glass transition temperature of 0° C. Silicon-bonded hydroxyl groups content: about 1%; Specific gravity: 1.05.
Silicone rubber powder: A spherical silicone rubber powder having a median diameter measured using a laser diffraction/scattering type particle size distribution of 2 μm, obtained by crosslinking a polydimethyl siloxane via a condensation reaction. Specific gravity: 0.98. 67 additive: (tradename) manufactured by Dow Corning Toray Co., Ltd.
CR: Chloroprene rubber (crosslinked product; Purchased from Kanda Gomu Kagaku Corporation)
EPDM: Crosslinked product of an ethylene propylene diene monomer (purchased from Kanda Gomu Kagaku Corporation)
POM: Polyacetal resin - In Tables 2 to 5, “silicone resin/solid lubricant ratio” indicates the quotient of the parts of the silicone resin powder and silicone resin with respect to 100 parts of the film-forming organic resin (solid content) in each coating composition, divided by the parts of the solid lubricant.
- The coating composition of the present invention can be suitably used as a surface coating on weather strips of vehicle openings, vehicle wiper blade rubber, weather seals, glass runs, and similar sliding members because a film formed by curing the coating composition maintains a low frictional drag over an extended period of time, and because sticking to glass, metal coated surfaces, and similar smooth surfaces can be prevented. Moreover, the coating composition of the present invention can be suitably used for treating O-rings, gaskets, various types of packings, and other sealing members; and also sliding sites of surfaces of rubber hoses.
Claims (16)
1. A coating composition for a sliding member, the coating composition comprising: a film-forming organic resin, a solid lubricant, and a silicone resin.
2. The coating composition of claim 1 , wherein from 30 to 120 parts by weight of the solid lubricant and from 5 to 80 parts by weight of the silicone resin are included per 100 parts by weight of the film-forming organic resin.
3. The coating composition of claim 1 , wherein a weight ratio of the silicone resin to the solid lubricant is in a range from 0.1 to 0.8.
4. The coating composition of claim 1 , wherein the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups.
5. The coating composition of claim 1 , wherein the silicone resin is a silicone resin powder that does not have a softening point.
6. The coating composition of claim 1 , wherein a breaking elongation at a pulling speed of 10 mm/minute of an organic resin film, obtained from the film-forming organic resin, having a thickness of from 20 to 30 μm and a width of 10 mm, is not less than 100%.
7. The coating composition of claim 1 , in combination with the sliding member, wherein the sliding member is rubber.
8. A coated body provided with a coating film comprising a coating composition for a sliding member described in claim 1 on a surface thereof.
9. A rubber member provided with a coating film comprising a coating composition for a sliding member described in claim 7 on a surface thereof.
10. The coating composition of claim 2 , wherein a weight ratio of the silicone resin to the solid lubricant is in a range from 0.1 to 0.8.
11. The coating composition of claim 2 , wherein the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups.
12. The coating composition of claim 3 , wherein the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups.
13. The coating composition of claim 10 , wherein the silicone resin has from 0.05 wt. % to 15 wt. % of silicon-bonded hydroxyl groups.
14. The coating composition of claim 2 , wherein the silicone resin is a silicone resin powder that does not have a softening point.
15. The coating composition of claim 3 , wherein the silicone resin is a silicone resin powder that does not have a softening point.
16. The coating composition of claim 4 , wherein the silicone resin is a silicone resin powder that does not have a softening point.
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| JPJP2009-192580 | 2009-08-21 | ||
| PCT/JP2010/064434 WO2011021725A1 (en) | 2009-08-21 | 2010-08-19 | Coating composition for sliding members |
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| US20120149611A1 true US20120149611A1 (en) | 2012-06-14 |
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| EP (1) | EP2468824A4 (en) |
| JP (1) | JPWO2011021725A1 (en) |
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| WO2014081044A3 (en) * | 2012-11-22 | 2014-11-27 | Dow Corning Toray Co., Ltd. | Coating composition for lubrication film |
| US20150057199A1 (en) * | 2012-05-07 | 2015-02-26 | Nok Klueber Co., Ltd. | Composition for Sliding Member |
| US20160272158A1 (en) * | 2013-11-27 | 2016-09-22 | Fukoku Co., Ltd. | Coating agent for wiper blade rubber and wiper blade rubber using same |
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| US11421173B2 (en) * | 2016-11-17 | 2022-08-23 | Taiho Kogyo Co., Ltd. | Resin composition and sliding member |
| US20220403277A1 (en) * | 2019-12-09 | 2022-12-22 | Dic Corporation | Lubricant and lubrication composition |
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| JP2012219183A (en) * | 2011-04-08 | 2012-11-12 | Sumico Lubricant Co Ltd | Coating composition, coating film composition and elastomer-coated gasket, and method for preventing fixing of gasket |
| KR102323247B1 (en) * | 2019-02-19 | 2021-11-08 | 이영상 | structure of a double pipe for gas and a fluid |
| JP7476439B2 (en) * | 2020-03-17 | 2024-05-01 | 大塚化学株式会社 | Coating composition and dry lubricating coating |
| EP4435061A1 (en) * | 2023-03-20 | 2024-09-25 | Air-lux technik ag | Device for closing a room opening, sealing member for closing a room opening and coating for sealing members |
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| JPS49122564A (en) * | 1973-03-20 | 1974-11-22 | ||
| JPH02229837A (en) * | 1989-01-31 | 1990-09-12 | Toshiba Silicone Co Ltd | Surface treating agent |
| JP2994699B2 (en) * | 1990-07-19 | 1999-12-27 | 東レ・ダウコーニング・シリコーン株式会社 | Film-forming organopolysiloxane composition |
| JP2903709B2 (en) * | 1991-04-22 | 1999-06-14 | タカタ株式会社 | Surface coating member |
| JP2785571B2 (en) * | 1992-03-27 | 1998-08-13 | タカタ株式会社 | Surface coating member |
| JP3454930B2 (en) | 1994-08-03 | 2003-10-06 | アクロス株式会社 | Resin coating material |
| JPH0892528A (en) * | 1994-09-19 | 1996-04-09 | Toyobo Co Ltd | Heat-resistant coating composition |
| JP2000026787A (en) * | 1998-07-10 | 2000-01-25 | Nippon Achison Kk | Composition for preventing creaking sound |
| JP2001344735A (en) * | 2000-06-05 | 2001-12-14 | Fuji Photo Film Co Ltd | Floppy disk and method for producing the same |
| JP2002356571A (en) * | 2001-05-30 | 2002-12-13 | Shin Etsu Polymer Co Ltd | Wiper-blade rubber material for transport facilities |
-
2010
- 2010-08-19 CN CN2010800371798A patent/CN102482516A/en active Pending
- 2010-08-19 KR KR1020127006701A patent/KR20120089847A/en not_active Withdrawn
- 2010-08-19 WO PCT/JP2010/064434 patent/WO2011021725A1/en not_active Ceased
- 2010-08-19 US US13/391,308 patent/US20120149611A1/en not_active Abandoned
- 2010-08-19 EP EP10810061A patent/EP2468824A4/en not_active Withdrawn
- 2010-08-19 JP JP2011527729A patent/JPWO2011021725A1/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150057199A1 (en) * | 2012-05-07 | 2015-02-26 | Nok Klueber Co., Ltd. | Composition for Sliding Member |
| US9777241B2 (en) * | 2012-05-07 | 2017-10-03 | Nok Klueber Co., Ltd. | Composition for sliding member |
| WO2014081044A3 (en) * | 2012-11-22 | 2014-11-27 | Dow Corning Toray Co., Ltd. | Coating composition for lubrication film |
| US9938483B2 (en) | 2012-11-22 | 2018-04-10 | Dow Corning Toray Co., Ltd. | Coating composition for lubrication film |
| US20160272158A1 (en) * | 2013-11-27 | 2016-09-22 | Fukoku Co., Ltd. | Coating agent for wiper blade rubber and wiper blade rubber using same |
| US10071711B2 (en) * | 2013-11-27 | 2018-09-11 | Fukoku Co., Ltd. | Coating agent for wiper blade rubber and wiper blade rubber using same |
| US11352581B2 (en) | 2016-11-17 | 2022-06-07 | Taiho Kogyo Co., Ltd. | Resin composition and sliding member |
| US11421173B2 (en) * | 2016-11-17 | 2022-08-23 | Taiho Kogyo Co., Ltd. | Resin composition and sliding member |
| US20220403277A1 (en) * | 2019-12-09 | 2022-12-22 | Dic Corporation | Lubricant and lubrication composition |
| US11718809B2 (en) * | 2019-12-09 | 2023-08-08 | Dic Corporation | Lubricant and lubrication composition |
| US20240158714A1 (en) * | 2021-03-24 | 2024-05-16 | Dic Corporation | Molybdenum disulfide particles and lubricating composition |
| US12435290B2 (en) * | 2021-03-24 | 2025-10-07 | Dic Corporation | Molybdenum disulfide particles and lubricating composition |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011021725A1 (en) | 2011-02-24 |
| JPWO2011021725A1 (en) | 2013-01-24 |
| CN102482516A (en) | 2012-05-30 |
| EP2468824A1 (en) | 2012-06-27 |
| EP2468824A4 (en) | 2013-02-13 |
| KR20120089847A (en) | 2012-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: DOW CORNING TORAY CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAGUCHI, TETSUJI;SASAKI, TAKAHIKO;REEL/FRAME:028572/0240 Effective date: 20120213 |
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| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |