CN107163787A - A kind of chromium-free Dyclo paint of cordierite doping and preparation method thereof - Google Patents
A kind of chromium-free Dyclo paint of cordierite doping and preparation method thereof Download PDFInfo
- Publication number
- CN107163787A CN107163787A CN201710552298.0A CN201710552298A CN107163787A CN 107163787 A CN107163787 A CN 107163787A CN 201710552298 A CN201710552298 A CN 201710552298A CN 107163787 A CN107163787 A CN 107163787A
- Authority
- CN
- China
- Prior art keywords
- cordierite
- powder
- chromium
- doping
- free dyclo
- 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.)
- Pending
Links
- 229910052878 cordierite Inorganic materials 0.000 title claims abstract description 22
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000003973 paint Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 239000004411 aluminium Substances 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims abstract description 10
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 10
- 239000010881 fly ash Substances 0.000 claims abstract description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 9
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 7
- 229920005573 silicon-containing polymer Polymers 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000000873 masking effect Effects 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000013019 agitation Methods 0.000 claims description 3
- 230000036760 body temperature Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 10
- 238000000576 coating method Methods 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000000280 densification Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000008261 resistance mechanism Effects 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5006—Amines aliphatic
-
- 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
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
-
- 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
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses chromium-free Dyclo paint of a kind of cordierite doping and preparation method thereof, it is characterised in that is made by the raw material of following parts by weight：Cordierite 35, schmigel 35, carborundum 48, flyash 13, polytetrafluoroethylene powder 5 10, epoxy resin E42 10 15, vinyl triamine 10 15, diatomite 12, zinc powder 20 30, aluminium powder 20 30, Silane coupling agent KH550 40 50, ethanol 5 10, acetone 50 70, dimethyl silicone polymer 0.3 0.6；The present invention has higher intensity and wearability, shows good mobility and tack, the coating densification of formation is smooth, solves that Dacroment masking liquid intensity is smaller, the shortcoming that wearability is bad, the great market competitiveness；Cooperation with the addition of cordierite, flyash etc., on the premise of coating property is not influenceed, reduce production cost.
Description
Technical field
The present invention relates to a kind of Dyclo paint, belong to anti-corrosion of metal field, and in particular to a kind of nothing of cordierite doping
Chromium Dyclo paint and preparation method thereof.
Background technology
Steel corrosion can all directly result in substantial amounts of accident or form accident potential every year, cause huge economic loss,
Have a strong impact on national economic development and safety.How to provide lasting corrosion resistance power also just becomes the focus of research.Reach
Crow coating is a kind of metal anti-corrosive paint constituted with flake zinc powder, aluminium powder chromic anhydride and organic reducing agent, strong resistance to by it
Corrosive nature, high temperature resistant, there is high osmosis, be used widely rapidly, however, due to containing in the dacroment process liquid
There are about 2% high carcinogenic and supervirulent Cr6+.Therefore at present Dyclo paint exist not environmentally, wearability is bad etc. lacks
Point.
Chromate in Dacromet/steel mainly plays bonding agent and passivator, and the substitute materials of selection chromate are
The problem of Non-chromium Zn-al Coating urgent need to resolve.《The preparation and corrosion resistance mechanism research of novel anticorrosion coating chromium-free Dyclo》Master
In academic dissertation, Wang Quanquan uses polyurethane modified epoxy resin for binding agent, and polyamide is curing agent, coordinates flakey
Aluminum zinc powder is prepared for a kind of chromium-free Dyclo paint, but haves the shortcomings that wearability, intensity are bad.
The content of the invention
It is an object of the invention to provide a kind of chromium-free Dyclo paint and preparation method thereof, overcome Dyclo paint current
The shortcoming that wearability is bad, intensity is not high of presence, the technical solution adopted by the present invention is as follows：
1. a kind of chromium-free Dyclo paint of cordierite doping, it is characterised in that be made by the raw material of following parts by weight：
Cordierite 3-5, schmigel 3-5, carborundum 4-8, flyash 1-3, polytetrafluoroethylene powder 5-10, epoxy resin E42
10-15, vinyl triamine 10-15, diatomite 1-2, zinc powder 20-30, aluminium powder 20-30, Silane coupling agent KH550 40-50, second
Alcohol 5-10, acetone 50-70, dimethyl silicone polymer 0.3-0.6；
The zinc powder and aluminium powder are flake powder.
2. described in a kind of doping of cordierite chromium-free Dyclo paint and preparation method thereof, it is characterised in that including with
Lower operating procedure：
A. ultrasonic disperse is carried out 1-2 hours to schmigel with ethanol solution, filtration drying；
B. schmigel obtained by step a and cordierite, carborundum, flyash, polytetrafluoroethylene powder and diatomite are ground in mortar
Mill makes it be transferred to after being sufficiently mixed in crucible, is placed into body of heater and is evacuated to 10-2Below Pa, and stove body temperature is risen to
250-350 DEG C, constant temperature is down to room temperature after 20-50 minutes, obtains mixture；
C. mixture obtained by step b is put into homogenizer, sprayed after Silane coupling agent KH550, stirring 10-30min,
1-3h is dried at 100-150 DEG C.
D. acetone and dimethyl silicone polymer are added into mixture obtained by step c, mechanical agitation is uniform, and base-material is made；
E. epoxy resin E42, vinyl triamine, zinc powder and aluminium powder are added in base-material obtained by step d, stir 1~3h, i.e.,
Obtain chromium-free Dyclo masking liquid.
3. described in a kind of doping of cordierite chromium-free Dyclo paint and preparation method thereof, it is characterised in that heating furnace
For Medium Frequency Induction Heating Furnace or resistance-heated furnace.
The beneficial effects of the invention are as follows：Use epoxy resin E42 for binding agent, vinyl triamine is curing agent, with molten
Agent is volatilized, and curing cross-linking reaction occurs for epoxy resin E42 and vinyl triamine curing agent, may eventually form fine and close, homogeneous, continuous
Film layer.Meanwhile, schmigel and carborundum are introduced, and schmigel and carborundum are handled with polytetrafluoroethylene powder, not only make it more
Good is dispersed in coating, and considerably increases the intensity and anti-wear performance of coating, shows good mobility and attachment
Property, the coating densification of formation is smooth, solves that Dacroment masking liquid intensity is smaller, the shortcoming that wearability is bad, great market competition
Power；Cooperation with the addition of cordierite, flyash etc., on the premise of coating property is not influenceed, reduce production cost.
Embodiment
In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below
Specific embodiment is closed, the present invention is expanded on further.
Embodiment
A kind of chromium-free Dyclo paint of cordierite doping, it is characterised in that be made by the raw material of following parts by weight：
Cordierite 5, schmigel 5, carborundum 8, flyash 3, polytetrafluoroethylene powder 10, epoxy resin E42 15, vinyl triamine
15, diatomite 2, zinc powder 30, aluminium powder 30, Silane coupling agent KH550 50, ethanol 10, acetone 70, dimethyl silicone polymer 0.6；
The zinc powder and aluminium powder are flake powder.
Described chromium-free Dyclo paint of a kind of cordierite doping and preparation method thereof, it is characterised in that including following
Operating procedure：
A. ultrasonic disperse is carried out 1-2 hours to schmigel with ethanol solution, filtration drying；
B. schmigel obtained by step a and cordierite, carborundum, flyash, polytetrafluoroethylene powder and diatomite are ground in mortar
Mill makes it be transferred to after being sufficiently mixed in crucible, is placed into body of heater and is evacuated to 10-2Below Pa, and stove body temperature is risen to
250-350 DEG C, constant temperature is down to room temperature after 20-50 minutes, obtains mixture；
C. mixture obtained by step b is put into homogenizer, sprayed after Silane coupling agent KH550, stirring 10-30min,
1-3h is dried at 100-150 DEG C.
D. acetone and dimethyl silicone polymer are added into mixture obtained by step c, mechanical agitation is uniform, and base-material is made；
E. epoxy resin E42, vinyl triamine, zinc powder and aluminium powder are added in base-material obtained by step d, stir 1~3h, i.e.,
Obtain chromium-free Dyclo masking liquid.
Chromium-free Dyclo paint of described a kind of cordierite doping and preparation method thereof, it is characterised in that heating furnace is
Medium Frequency Induction Heating Furnace or resistance-heated furnace.
After tested：
3 grades of coating binding force
Resistance to NH4NO3The min of etching time 237.
Claims (3)
1. a kind of chromium-free Dyclo paint of cordierite doping, it is characterised in that be made by the raw material of following parts by weight：
Cordierite 3-5, schmigel 3-5, carborundum 4-8, flyash 1-3, polytetrafluoroethylene powder 5-10, epoxy resin E42
10-15, vinyl triamine 10-15, diatomite 1-2, zinc powder 20-30, aluminium powder 20-30, Silane coupling agent KH550 40-50, second
Alcohol 5-10, acetone 50-70, dimethyl silicone polymer 0.3-0.6；
The zinc powder and aluminium powder are flake powder.
2. chromium-free Dyclo paint of a kind of cordierite doping according to claim 1 and preparation method thereof, its feature exists
In, including following operating procedure：
A. ultrasonic disperse is carried out 1-2 hours to schmigel with ethanol solution, filtration drying；
B. schmigel obtained by step a and cordierite, carborundum, flyash, polytetrafluoroethylene powder and diatomite are ground in mortar
Mill makes it be transferred to after being sufficiently mixed in crucible, is placed into body of heater and is evacuated to 10-2Below Pa, and stove body temperature is risen to
250-350 DEG C, constant temperature is down to room temperature after 20-50 minutes, obtains mixture；
C. mixture obtained by step b is put into homogenizer, sprayed after Silane coupling agent KH550, stirring 10-30min,
1-3h is dried at 100-150 DEG C；
D. acetone and dimethyl silicone polymer are added into mixture obtained by step c, mechanical agitation is uniform, and base-material is made；
E. epoxy resin E42, vinyl triamine, zinc powder and aluminium powder are added in base-material obtained by step d, stir 1~3h, i.e.,
Obtain chromium-free Dyclo masking liquid.
3. chromium-free Dyclo paint of a kind of cordierite doping according to claim 2 and preparation method thereof, its feature exists
In heating furnace is Medium Frequency Induction Heating Furnace or resistance-heated furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710552298.0A CN107163787A (en) | 2017-07-07 | 2017-07-07 | A kind of chromium-free Dyclo paint of cordierite doping and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710552298.0A CN107163787A (en) | 2017-07-07 | 2017-07-07 | A kind of chromium-free Dyclo paint of cordierite doping and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107163787A true CN107163787A (en) | 2017-09-15 |
Family
ID=59823322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710552298.0A Pending CN107163787A (en) | 2017-07-07 | 2017-07-07 | A kind of chromium-free Dyclo paint of cordierite doping and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107163787A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397413B (en) * | 2008-09-17 | 2011-11-23 | 北京航材百慕新材料技术工程股份公司 | VCI-containing flake cold-plating zinc and aluminum protective coating on steel structure surface and preparation method thereof |
| CN103396709A (en) * | 2005-04-19 | 2013-11-20 | 杜邦三井氟化物有限公司 | Fluororesin coating film |
| CN105567049A (en) * | 2016-01-29 | 2016-05-11 | 华若延 | Marking paint |
-
2017
- 2017-07-07 CN CN201710552298.0A patent/CN107163787A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396709A (en) * | 2005-04-19 | 2013-11-20 | 杜邦三井氟化物有限公司 | Fluororesin coating film |
| CN101397413B (en) * | 2008-09-17 | 2011-11-23 | 北京航材百慕新材料技术工程股份公司 | VCI-containing flake cold-plating zinc and aluminum protective coating on steel structure surface and preparation method thereof |
| CN105567049A (en) * | 2016-01-29 | 2016-05-11 | 华若延 | Marking paint |
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Application publication date: 20170915 |
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