EP1190119B1 - Verfahren zur elektrotauchlackierung von kanten aufweisenden substraten - Google Patents
Verfahren zur elektrotauchlackierung von kanten aufweisenden substraten Download PDFInfo
- Publication number
- EP1190119B1 EP1190119B1 EP00927113A EP00927113A EP1190119B1 EP 1190119 B1 EP1190119 B1 EP 1190119B1 EP 00927113 A EP00927113 A EP 00927113A EP 00927113 A EP00927113 A EP 00927113A EP 1190119 B1 EP1190119 B1 EP 1190119B1
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- EP
- European Patent Office
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- 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.)
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- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- IUNMPGNGSSIWFP-UHFFFAOYSA-N dimethylaminopropylamine Chemical compound CN(C)CCCN IUNMPGNGSSIWFP-UHFFFAOYSA-N 0.000 description 1
- 239000012972 dimethylethanolamine Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- RUZYUOTYCVRMRZ-UHFFFAOYSA-N doxazosin Chemical compound C1OC2=CC=CC=C2OC1C(=O)N(CC1)CCN1C1=NC(N)=C(C=C(C(OC)=C2)OC)C2=N1 RUZYUOTYCVRMRZ-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000012799 electrically-conductive coating Substances 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000019382 gum benzoic Nutrition 0.000 description 1
- 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 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- ARZLUCYKIWYSHR-UHFFFAOYSA-N hydroxymethoxymethanol Chemical group OCOCO ARZLUCYKIWYSHR-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000001034 iron oxide pigment Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- HLJDOURGTRAFHE-UHFFFAOYSA-N isocyanic acid;3,5,5-trimethylcyclohex-2-en-1-one Chemical compound N=C=O.N=C=O.CC1=CC(=O)CC(C)(C)C1 HLJDOURGTRAFHE-UHFFFAOYSA-N 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 1
- PULCKIYKBGOTTG-UHFFFAOYSA-N n-(2,4-dimethylpentan-3-ylidene)hydroxylamine Chemical compound CC(C)C(=NO)C(C)C PULCKIYKBGOTTG-UHFFFAOYSA-N 0.000 description 1
- BKFPILLUYYCDSK-UHFFFAOYSA-N n-(4-formamido-3-methylphenyl)formamide Chemical compound CC1=CC(NC=O)=CC=C1NC=O BKFPILLUYYCDSK-UHFFFAOYSA-N 0.000 description 1
- WHIVNJATOVLWBW-UHFFFAOYSA-N n-butan-2-ylidenehydroxylamine Chemical compound CCC(C)=NO WHIVNJATOVLWBW-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 125000000466 oxiranyl group Chemical group 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- 150000003217 pyrazoles Chemical class 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 238000005956 quaternization reaction Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical group [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005829 trimerization reaction Methods 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- AVWRKZWQTYIKIY-UHFFFAOYSA-N urea-1-carboxylic acid Chemical compound NC(=O)NC(O)=O AVWRKZWQTYIKIY-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 125000002348 vinylic group Chemical group 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31515—As intermediate layer
- Y10T428/31522—Next to metal
Definitions
- the invention relates to a method for electrocoating of electrically conductive, edged motor vehicle bodies or parts thereof and the Use the method to reduce or prevent edge alignment when baking electrically deposited ETL coating layers.
- Electrodeposition paints are used in particular for the production of anti-corrosion primers on metallic substrates. For example, however, they can also be deposited and baked on any electrically conductive substrates as a single-layer topcoat, clearcoat or as a lacquer layer which is arranged within a multi-layer coating.
- An ETL coating layer arranged within a multi-layer lacquer coating can be, for example, a lacquer layer with a decorative effect, which functions as a topcoat or can also be overcoated with a clear lacquer layer.
- One problem with painting with electro-dip paints is the alignment of edges when baking an ETL coating layer previously deposited on an electrically conductive substrate.
- the ETL coating layer pulls away from the edge while reducing the layer thickness or in the immediate vicinity of the edge.
- the edge is insufficiently covered after baking. While this can be perceived, for example, in the case of decorative ETL coatings as a color difference due to the substrate shining through in the area of the edge, in the case of corrosion-protective ETL primers there is an impairment or loss of the corrosion-protective effect on or in the area of the edge.
- the corrosion on the edges accessible to the observer is particularly disturbing from a visual point of view, for example in the form of visible rust spots and runners that form during use of the coated substrates.
- ETL coating compositions curable by irradiation with ultraviolet light as well as the Hardening of ETL coating layers electrically deposited from such ETL coating agents by UV radiation are, inter alia, from the US patents 40 40 925 and 40 39 414 known.
- From US-A-4540598 is a process for the thermal curing of acid-curable paints known using photochemically activatable blocked sulfonic acids.
- From US-A-5091438 is a process for curing polyurethane paints Known use of certain arene-iron (II) compounds.
- the object of the invention is to provide a method for electrocoating with the ETL coatings with good edge coverage on electrically conductive, edged motor vehicle bodies or their parts can be obtained, that is, the deposited ETL coating layer should show little or no edge alignment behavior when baked.
- the alignment of the edges on the edges accessible to the viewer should be avoided in order to avoid the undesirable formation of optically disruptive corrosion phenomena on such edges during the later use of the coated substrates.
- thermally curable ETL coating composition which contains a binder system containing free-radically polymerizable, olefinically unsaturated double bonds, is used for the electrocoating of an electrically conductive, edge-containing substrate, and if one before Burning in the coating layer electrically deposited from the ETL coating agent, UV-irradiating the electrically deposited coating layer, at least on edges of the substrate, and then curing the wholly or partially UV-irradiated ETL coating layer by baking.
- hardening used here and in the following means hardening in the sense of a chemical crosslinking of the ETL coating layer by the formation of covalent bonds between the components of the thermally hardenable ETL binder system.
- the present invention therefore relates to a method for Electrocoating as defined in claim 1.
- the method according to the invention can advantageously be used for Electrocoating three-dimensional, electrically conductive, in particular metallic, edged substrates with the viewer directly accessible and inaccessible areas, especially with the viewer directly accessible and inaccessible edges.
- Directly accessible to the viewer means “the eye of the beholder from the outside without any special technical or optical aids accessible ". Only the viewer can directly access them Areas or edges also directly accessible to UV radiation.
- Substrates with areas directly accessible and inaccessible to the viewer, especially with edges that are directly accessible and inaccessible to the viewer are in particular motor vehicle bodies with their cavities, folds and others design-related undercuts.
- Examples for the viewer directly accessible edges of motor vehicle bodies are cut edges that are visible from the outside individual body components, perforated edges, for example of clip holes or for components to be installed such as windows, headlights, door locks or door handles provided openings and gutter edges.
- the electrocoat materials used in the process according to the invention are are aqueous coating compositions with a solids content of, for example, 10 to 30 Wt .-%. It can be anodically or cathodically depositable electrodeposition paints act.
- the solid body used in the process according to the invention Electrocoating is achieved through the solid resin of the ETL binder system, reactive diluent, if any (compounds used during UV radiation and / or chemically incorporated into the paint film during the baking process ), pigments, fillers and other customary non-volatile additives. Solid means here and subsequently theoretical solid, it takes into account no losses, for example evaporation and / or burn-in losses during Application, UV radiation and curing of the ETL coating agent.
- the Binder system of the ETL coating agents used in the process according to the invention is made up of one or more ETL binders, any crosslinking agents, paste resins, if any, and optionally contained non-ionic additional resins.
- it is 100% by weight in the composition of the ETL binder system additive weight-solids ratios of 50 to 100 wt .-% ETL binder, 0 up to 50% by weight of crosslinking agent, 0 to 30% by weight of nonionic additional resins and 0 to 20 % By weight paste resin.
- non-ionic additional resins and / or Paste resins can possibly be identical substances that perform two or three functions in the ETL coating material at the same time, for example at the same time as a non-ionic additional resin and as a crosslinker or at the same time serve as a crosslinker and as a paste resin.
- the sum of the weight solids of Crosslinker, non-ionic additional resin and paste resin is a maximum of 50% by weight of the solid resin of the ETL binder system.
- Binder systems are customary for electrocoat materials, thermal, in particular binder systems curable by stoving, which under UV radiation Radically polymerizable, olefinically unsaturated double bonds contain.
- the ETL binders and / or the crosslinking agents preferably contain under UV radiation Radically polymerizable, olefinically unsaturated double bonds.
- the any non-ionic additional resins contained in the ETL coating agents and paste resins can also be radically polymerizable under UV radiation, contain olefinically unsaturated double bonds. Both the paste resins and the non-ionic additional resins can be reactive within the ETL binder system or be non-reactive, i.e. They can be irrespective of whether they are themselves under UV radiation Radically polymerizable, olefinically unsaturated double bonds included, in the curing of process step 3) can be integrated or not with can be integrated.
- the salary of the ETL binder systems on free-radically polymerizable under UV radiation, olefinically unsaturated double bonds are dimensioned so that a radical Polymerization of the olefinically unsaturated double bonds of the ETL binder systems can be done under UV radiation.
- olefinically unsaturated double bonds can be caused by UV radiation radical polymerization not, for example not completely, only with difficulty or trade easily curable ETL binder systems.
- C C equivalent weight of the solid resin in the lower range, for example from 250 to 2000.
- C C equivalent weight the resin solid higher, for example from 250 to 10,000, preferably from 500 to 3000.
- the C C equivalent weight of the resin solid of ETL binder system refers to the amount of resin solids in grams that a Contains moles of olefinic double bonds.
- the radically polymerizable, olefinic Unsaturated double bonds can be part of the polymer backbone polymeric Components of the ETL binder system, in particular the ETL binder and / or be the crosslinker and / or as lateral and / or terminal functional groups polymeric components of the ETL binder system, in particular the ETL binder and / or the crosslinker is present.
- the double bonds can be through different organic chemical methods known to those skilled in the art polymeric components of the ETL binder system, in particular the ETL binder and / or crosslinkers are introduced.
- the ETL coating agents used in the process according to the invention can be electrodeposition lacquers which can be deposited anodically or cathodically.
- the ETL binders therefore carry ionic and / or substituents which can be converted into ionic groups.
- the crosslinking agents which may be present in the ETL coating compositions can also have ionic groups and / or groups which can be converted into ionic groups.
- the ionic groups or groups which can be converted into ionic groups can be anionic or groups which can be converted into anionic groups, for example acidic groups such as -COOH, -SO 3 H and / or -PO 3 H 2 and the corresponding anionic groups neutralized with bases.
- the ionic groups can also be cationic or convertible into cationic groups, for example basic groups, preferably basic groups containing nitrogen; these groups can be quaternized or they can be converted into cationic groups using a customary neutralizing agent, for example an organic monocarboxylic acid, such as, for example, formic acid or acetic acid.
- a customary neutralizing agent for example an organic monocarboxylic acid, such as, for example, formic acid or acetic acid.
- Examples are amino, ammonium, for example quaternary ammonium, phosphonium and / or sulfonium groups.
- Existing amino groups can be primary, secondary and / or tertiary.
- the groups which can be converted into ionic groups can be present in completely or partially neutralized form.
- the ETL coating agents which can be used in the process according to the invention can be known anodically depositable ETL coating agents (ATL). These contain anodically depositable binders, for example based on polyesters, epoxy resin esters, (meth) acrylic copolymer resins, maleate oils or polybutadiene oils, for example with a weight average molecular weight (Mw) of 300 to 10,000 and for example an acid number of 35 to 300 mg KOH / g.
- the binders carry, for example, COOH, SO 3 H and / or PO 3 H 2 groups. After neutralization of at least some of the acidic groups, the resins can be converted into the water phase.
- ETL coating agents used for priming are preferably per se Known, cathodically depositable ETL coating agents (KTL). These contain cathodically depositable binders, for example primary, secondary and / or resins containing tertiary amino groups, the amine numbers of which e.g. at 20 to 250 mg KOH / g.
- the weight average of the molecular weight (Mw) of these KTL binders is preferably at 300 to 10000.
- KTL binders are amino epoxy resins, Amino (meth) acrylate resins, aminopolyurethane resins, those containing amino groups Polybutadiene resins and / or modified epoxy resin-carbon dioxide-amine reaction products.
- the ETL binders can be self-crosslinking or crosslinking, in the latter case they can be used they contain groups capable of chemical crosslinking and the ETL coating agents then crosslinker.
- the ETL binder systems are thermal, especially curable by baking. With thermal curing it can is a curing of the ETL binder system by radical Polymerization of olefinically unsaturated double bonds and / or by Act condensation reactions and / or addition reactions.
- the ETL binder systems can be mixed from thermal to radical Polymerization of olefinically unsaturated double bonds and through Condensation reactions and / or addition reactions curable ETL binder systems are present and / or the ETL binder system contains one or several ETL binders, each thermally by both radical Polymerization of olefinically unsaturated double bonds as well Condensation reactions and / or addition reactions are curable.
- the thermally by radical Polymerization-curable ETL binders can be used in combination, for example with non-ionic radically polymerizable prepolymers (as representatives of non-ionic Additional resins) and / or radically polymerizable reactive diluents (Radically polymerizable monomers) are present.
- non-ionic, free-radically polymerizable prepolymers or oligomers which as non-ionic additional resins, especially in thermal by radical Polymerization-curable ETL coating agents can be included (meth) acrylic functional (meth) acrylic copolymers, epoxy resin (meth) acrylates, Polyester (meth) acrylates, polyether (meth) acrylates, polyurethane (meth) acrylates, unsaturated polyesters, unsaturated polyurethanes or silicone (meth) acrylates number average molecular masses (Mn) preferably in the range from 200 to 10,000, particularly preferably from 500 to 3000 and with an average of 2 to 20, preferably 3 up to 10 radically polymerizable, olefinic double bonds per molecule.
- Mn number average molecular masses
- the radically polymerizable reactive thinners which are used in proportions of 0 to 20 wt .-%, based on the resin solids of the ETL binder system, in the ETL coating agents can be contained, it is low molecular weight defined compounds that can be mono-, di- or polyunsaturated.
- reactive diluents examples include: (meth) acrylic acid ester, vinyl acetate, vinyl ether, substituted vinyl ureas, ethylene and propylene glycol di (meth) acrylate, 1,3- and 1,4-butanediol di (meth) acrylate, Vinyl (meth) acrylate, allyl (meth) acrylate, glycerol tri, di and mono (meth) acrylate, trimethylolpropane tri-, di- and mono (meth) acrylate, styrene, Vinyltoluene, divinylbenzene, pentaerythritol tri- and tetra (meth) acrylate, di- and Tripropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate.
- the ETL binders can be used as an aqueous ETL binder dispersion can optionally contain, for example, crosslinkers for the preparation of the ETL coating agents used according to the method are used.
- ETL binder dispersions can be made by synthesizing ETL binders in the presence or absence of organic solvents and Conversion to an aqueous dispersion by dilution with the neutralizing agent neutralized ETL binders with water.
- the ETL binders can be mixed be converted into the aqueous dispersion with, for example, crosslinking agents.
- organic solvents can be used before or after transfer to the aqueous solution Dispersion to the desired content can be removed, for example by Distillation in a vacuum.
- ETL coating agents used pigments, fillers, photoinitiators, thermal contain activatable radical initiators, solvents and / or additives common in paint.
- pigments are the customary inorganic and / or organic Colored pigments and / or effect pigments, such as e.g. Titanium dioxide, iron oxide pigments, carbon black, Phthalocyanine pigments, quinacridone pigments, metal pigments, e.g. made of titanium, Aluminum or copper, interference pigments, e.g. coated with titanium dioxide Aluminum, coated mica.
- Fillers are kaolin, talc or Silica. The type and amount of pigments depends on the Purpose of the ETL coating agent.
- the pigments and / or fillers can be in part of the ETL binder dispersed and then on a suitable aggregate, e.g. grinded in a pearl mill then complete by mixing with the missing portion of ETL binders.
- This material cannot be used beforehand happen after adding neutralizing agent - by diluting with water ETL coating agent or bath are produced (one-component procedure).
- Pigmented ETL coating agents or baths can also be mixed an ETL binder dispersion and a separately produced pigment paste are produced (two-component procedure).
- an ETL binder dispersion for example further diluted with water and then one aqueous pigment paste added.
- Aqueous pigment pastes are made according to the expert known methods, preferably by dispersing the pigments and / or Fillers in paste resins commonly used for this purpose.
- the pigment plus filler / binder plus crosslinker weight ratio of the im ETL coating agent used according to the method is, for example from 0: 1 to 0.8: 1, preferably it is between 0.05: 1 and for pigmented lacquers 0.4: 1.
- the ETL coating agents used in the process according to the invention can contain volatile and / or non-volatile additives, for example in proportions from 0.1 to 5% by weight, based on the resin solids. It is about in particular those such as are known for ETL coating agents, for example Wetting agents, neutralizing agents, leveling agents, catalysts, corrosion inhibitors, Antifoam agents, light stabilizers, antioxidants, dyes, biocides and conventional Anti-crater additives.
- volatile and / or non-volatile additives for example in proportions from 0.1 to 5% by weight, based on the resin solids. It is about in particular those such as are known for ETL coating agents, for example Wetting agents, neutralizing agents, leveling agents, catalysts, corrosion inhibitors, Antifoam agents, light stabilizers, antioxidants, dyes, biocides and conventional Anti-crater additives.
- the ETL coating agents used in the process according to the invention can Photoinitiators e.g. in amounts of 0.1 to 5% by weight, based on the resin solids contain. It is favorable if their absorption is in the wavelength range from 260 to 450 nm.
- photoinitiators used alone or as a mixture in the ETL coating agents are benzoin and derivatives, acetophenone and derivatives, e.g. 2,2-diacetoxyacetophenone, benzophenone and derivatives, thioxanthone and derivatives, anthraquinone, 1-benzoylcyclohexanol, organophosphorus compounds, such as. Acyl phosphine oxides.
- thermolabile Free radical initiators are organic peroxides, organic azo compounds or C-C cleavage ends Initiators, such as dialkyl peroxides, peroxocarboxylic acids, peroxodicarbonates, Peroxide esters, hydroperoxides, ketone peroxides, azodinitriles or benzpinacol silyl ethers.
- the preferred amounts are between 0.1 and 5% by weight, based on the Resin solids.
- the additives, photoinitiators and thermolabile radical initiators can any way, for example during binder synthesis, during the Production of ETL binder dispersions, via a pigment paste or be introduced separately into the ETL coating agent.
- the ETL coating agents used in the process according to the invention can also contain customary solvents in the proportions customary for ETL coating agents.
- examples are glycol ethers such as butyl glycol and ethoxypropanol and alcohols such as butanol.
- the solvents can get into the ETL coating media in various ways, for example as a component of binder or crosslinking agent solutions, via an ETL binder dispersion, as a component of a pigment paste or by separate addition.
- the solvent content of the ETL coating compositions is, for example, from 0 to 5% by weight, based on the ETL bath that can be coated.
- the ETL coating agents used in the process according to the invention can according to the known processes for the production of ETL baths, i.e. basically both by means of the one-component and by means of the two-component procedure.
- the ETL coating agents used in the process according to the invention can within the process according to the invention in the usual way Electrodeposition as part of a single-layer or multi-layer coating various electrically conductive or made electrically conductive, for example with an electrically conductive coating layer provided with edges, in particular metallic substrates are applied.
- edges like explained above, the viewer, or that in method step 2) UV radiation may be fully or only partially accessible.
- the method according to the invention is suitable on the Motor vehicle sector for applying anti-corrosion ETL primers on motor vehicle bodies or motor vehicle body parts.
- the ETL primers can optionally be provided with additional layers of paint become.
- the ETL coating agents can, however, according to the inventive method For example, as a top coat, clear coat or as a lacquer layer that within a Multilayer coating is arranged and can have a decorative function, be deposited electrophoretically.
- step 2) of the method according to the invention is carried out by UV radiation uncured ETL coating layer leads to a radical Polymerization of olefinically unsaturated double bonds in the ETL binder system in the uncured ETL coating layer, but not at all to harden the ETL coating layer.
- the curing of the ETL coating layer is only in process step 3) of the inventive method caused by baking.
- the ETL coating layer reaches after the UV radiation does not have the pendulum hardness as after the subsequent thermal Curing by baking and / or is, for example, repeated Wiping removable with a solvent-soaked cotton ball. After this Baking is the ETL coating layer solvent-resistant and also by more than 100 times wiping with a solvent-soaked cotton ball cannot be removed.
- the method according to the invention can, for example, by a suitable choice of Composition of the ETL coating agent and / or the process management within of process step 2) are guaranteed.
- the pigmentation, the type and amount of photoinitiators and the ETL binder system in the ETL coating agent be chosen so that a curing of the ETL coating agent deposited ETL coating layer in process step 2) of method according to the invention is not possible or is possible only with difficulty.
- UV radiation can be chosen to absorb more or less pigmentation and / or no or only a small amount of photoinitiator is used and / or the ETL binder system is difficult or not radical Polymerization curable. Accordingly, can also influence the Process parameters of process step 2) are taken as follows will be explained later.
- UV radiation Suitable sources of UV radiation are for example those with emissions in the wavelength range from 180 to 420 nm, preferably from 200 to 400 nm.
- UV radiation sources are optionally doped high pressure, medium pressure and -low pressure radiators, gas discharge tubes, e.g. Xenon low pressure lamps, UV spotlights, Black light tubes, high energy electron flash devices, such as e.g. UV flash lamps.
- the UV radiation sources can work continuously or discontinuously be designed.
- One possibility for briefly switchable (switchable) UV sources consists of the connection of e.g. movable shutters or UV flash lamps used.
- the arrangement of the UV radiation sources is known in principle, it can Conditions of the substrate, for example an automobile body or the irradiating edges of the substrate are adjusted.
- the substrate irradiated as a whole, e.g. while going through a UV radiation tunnel or a radiation curtain can be used that is moved relative to the substrate.
- an automatic device punctiform UV radiation source or a small area lamp over the substrate be performed.
- only the edges or edges can be shown Areas of the substrate are UV-irradiated.
- the distance of the UV radiation source can be fixed or it is set to a desired one Value of the substrate, for example the substrate shape or the arrangement of the edges of the Adjusted substrate.
- the distances between the UV radiation sources are, for example Range from 2 to 50 cm to the surface of the ETL coating layer.
- the irradiation time is, for example, in the range of the duration of a UV flash for example 100 milliseconds to 5 minutes, depending on the one used Irradiation method and type and number of UV radiation sources. Is preferred a radiation duration, i.e. an actual exposure time of the UV radiation to the uncured ETL coating layer of less than 5 minutes.
- the during the step 2) of the inventive method of energy is supplied to the uncured ETL coating layer by UV radiation not enough to harden them.
- the composition of the in the invention Process used ETL coating agent is such that the ETL coating layer under UV radiation by radical means Polymerization is curable, the UV radiation is carried out so that a complete curing of the ETL coating layer is reliably avoided.
- the one suitable measures are known to the person skilled in the art, for example can Exposure time of UV radiation, distance of the UV radiation source from the ETL coating layer, Corresponding wavelength and / or power of the UV radiation source to get voted.
- the UV irradiation of process step 2) is carried out before the Process step 3) made.
- UV radiation and stoving can be used be spatially and temporally separated from each other.
- the UV radiation sources are outside the baking oven.
- Standard in the case produced goods the UV radiation sources can also be found at the beginning of the Baking oven or in its front area, for example in the front third of the Baking oven.
- the UV radiation sources in the Inlet area of the baking oven can be arranged.
- the method according to the invention is then characterized by a partial spatial and temporal parallelism of UV radiation and stoving, however, the UV radiation of the Process step 2) has already ended while the curing of process step 3) has not yet started or has only just begun, for example while the substrate is still is heated.
- the whole or partial UV irradiation is still uncured ETL coating layer in process step 3) by baking hardened.
- baking takes place for example for a period of 20 to 30 minutes at oven temperatures from 80 to 220 ° C.
- the method according to the invention allows the production of cured ETL coatings with good edge coverage on electrically conductive. Edged substrates.
- the corrosion protection of ETL-primed edges, especially of metal substrates UV exposure before baking is improved.
- the unwanted education optically disruptive edge corrosion during later use of the painted substrates can be avoided.
- binder solution 3120 g are made according to DE-B-27 32 902, column 9, example A2 706 g bisphenol A epoxy resin (epoxy equivalent weight 260), 631 g Ethyl glycol acetate, 0.25 g hydroquinone, 765 g half ester Tetrahydrophthalic anhydride and hydroxyethyl methacrylate, and 1017 g of a 70th % solution of a monoisocyanate from tolylene diisocyanate and Dimethylethanolamine made in ethyl glycol acetate and with 1930 g one with Binder solution from Example 1 diluted to 60% solids in ethoxypropanol mixed. The solids content of the solution is 66%. The calculated Double bond equivalent weight is 618, based on solid resin.
- Example 3 is repeated with the difference that instead of 348 g Hydroxyethyl acrylate 360 g butyl glycol can be used.
- 505 g of the binder solution from Example 2 are stirred with 50 g Ethoxypropanol, 2.4 g of carbon black and 235 g of titanium dioxide mixed and on a bead mill ground.
- the binder solution from Example 2 161 g of the crosslinking agent solution from Example 3, 50 g of phenoxypropanol and 31 g of 50% aqueous formic acid the approach completes.
- Dibutyltin dilaurate is equivalent to an amount of 0.5% Tin, based on the resin solids, mixed homogeneously.
- a KTL bath is made of water.
- Example 5 The procedure is as in Example 5, with the difference that instead of 161 g Crosslinker solution from Example 3 161 g of the crosslinker solution from Example 4 were used become.
- 505 g of the binder solution from Example 1 are mixed with 20 g with good stirring Ethoxypropanol, 2.4 g of carbon black and 235 g of titanium dioxide mixed and on a bead mill ground.
- the binder solution from Example 1 With 273 g of the binder solution from Example 1, 132 g of the crosslinking agent solution from Example 3, 50 g of phenoxypropanol and 31 g of 50% aqueous formic acid the approach completes.
- Dibutyltin dilaurate is equivalent to an amount of 0.5% Tin, based on the resin solids, mixed homogeneously.
- a KTL bath is made of water.
- Example 7 is repeated with the difference that instead of 132 g the Crosslinker solution from Example 3 132 g of the crosslinker solution from Example 4 were used become.
- the KTL baths from Examples 5 to 8 are stirred open for three days without access to light. Thereafter, paint films are cathodically deposited from each of the KTL baths onto perforated (hole diameter 10 mm), degreased, non-phosphated body sheets in 20 ⁇ m dry layer thickness and rinsed with deionized water. After an evaporation time of 30 minutes at room temperature, the test panels are UV-irradiated and then 17 minutes. Baked at 175 ° C object temperature or baked under the same conditions without UV radiation. The burned-in test sheets are subjected to a salt spray exposure in accordance with DIN 50 021-SS for 120 hours.
- edges of the holes are evaluated with regard to edge rust (characteristic values KW 0 to 5; KW 0, edges without rust; KW 1, isolated rust spots on edges; KW 2, rust spots on less than 1/3 of the edges; KW 3, 1 / 3 to 1/2 of the edges rust-covered; KW 4, more than 1/2 of the edges rust-covered; KW 5, edges completely rusty).
- edge rust characteristic values KW 0 to 5; KW 0, edges without rust; KW 1, isolated rust spots on edges; KW 2, rust spots on less than 1/3 of the edges; KW 3, 1 / 3 to 1/2 of the edges rust-covered; KW 4, more than 1/2 of the edges rust-covered; KW 5, edges completely rusty.
- the results are shown in the following table: CDL bath without UV with UV with UV with UV with UV 5 KW 5 KW 1 acc. KW 0 compl. 6 KW 5 KW 2-3 compl. KW 2 compl. 7 KW 5 KW 2 compl. KW 1-2 8th
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Ein Problem bei der Lackierung mit Elektrotauchlacken ist die Kantenflucht beim Einbrennen einer zuvor auf einem elektrisch leitfähigen Substrat abgeschiedenen ETL-Überzugsschicht. Dabei zieht die ETL-Überzugsschicht von der Kante weg unter Verringerung der Schichtdicke an bzw. in unmittelbarer Nähe der Kante. Im Extremfall ist die Kante nach dem Einbrennen unzureichend bedeckt. Während dies beispielsweise im Falle dekorativer ETL-Beschichtungen als Farbunterschied aufgrund des im Bereich der Kante durchscheinenden Untergrundes wahrgenommen werden kann, kommt es im Falle von korrosionsschützenden ETL-Grundierungen zu einer Beeinträchtigung oder zum Verlust der korrosionsschützenden Wirkung an bzw. im Bereich der Kante. Abgesehen von den technischen Nachteilen der Kantenkorrosion stört die Korrosion an dem Betrachter zugänglichen Kanten insbesondere in optischer Hinsicht, beispielsweise in Form sich während des Gebrauchs der lackierten Substrate bildender sichtbarer Rostflecke und -läufer.
Es hat sich gezeigt, daß diese Aufgabe gelöst werden kann, wenn man ein thermisch aushärtbares ETL-Überzugsmittel, welches ein Bindemittelsystem mit einem Gehalt an radikalisch polymerisierbaren, olefinisch ungesättigten Doppelbindungen enthält, zur Elektrotauchlackierung eines elektrisch leitfähigen, Kanten aufweisenden Substrats verwendet und wenn man vor Einbrennen der aus dem ETL-Überzugsmittel elektrisch abgeschiedenen Überzugsschicht eine UV-Bestrahlung der elektrisch abgeschiedenen Überzugsschicht, zumindest an Kanten des Substrats durchführt und danach die ganz oder teilweise UV-bestrahlte ETL-Überzugsschicht durch Einbrennen aushärtet. Der hier und in der Folge gebrauchte Ausdruck "Aushärtung" bedeutet Aushärtung im Sinne einer chemischen Vernetzung der ETL-Überzugsschicht durch Ausbildung kovalenter Bindungen zwischen den Bestandteilen des thermisch aushärtbaren ETL-Bindemittelsystems.
Beispiele sind Glykolether, wie Butylglykol und Ethoxypropanol und Alkohole, wie Butanol. Die Lösemittel können auf verschiedene Weise in die ETL-Überzugsmittel gelangen, beispielsweise als Bestandteil von Bindemittel- oder Vernetzerlösungen, über eine ETL-Bindemitteldispersion, als Bestandteil einer Pigmentpaste oder auch durch separaten Zusatz. Der Lösemittelgehalt der ETL-Überzugsmittel beträgt beispielsweise von 0 bis 5 Gew.-%, bezogen auf beschichtungsfähiges ETL-Bad.
| KTL-Bad | ohne UV | mit UV | mit UV |
| 5 | KW 5 | KW 1 erfgem. | KW 0 erfgem. |
| 6 | KW 5 | KW 2-3 erfgem. | KW 2 erfgem. |
| 7 | KW 5 | KW 2 erfgem. | KW 1-2 erfgem. |
| 8 | KW 5 | KW 5 | KW 5 |
Claims (4)
- Verfahren zur Elektrotauchlackierung von elektrisch leitfähigen, Kanten aufweisenden Kraftfahrzeugkarossen oder Teilen davon, dadurch gekennzeichnet, dass man nacheinander folgende Verfahrensschritte durchführt:a) Elektroabscheidung einer Überzugsschicht aus einem elektrisch abscheidbaren Überzugsmittel, das ein thermisch aushärtbares Bindemittelsystem mit einem Gehalt an unter UV-Bestrahlung rodikalisch polymerisierbaren, olefinisch ungesättigten Doppelbindungen entsprechend einem C=C-Äquivalentgewicht des Harzfestkörpers von 250 bis 10000 enthält, auf den elektrisch leitfähigen, Kanten aufweisenden Kraftfahrzeugkarossen oder Teilen davon,b) UV-Bestrahlung der gesamten Fläche der elektrisch abgeschiedenen Überzugsschicht oder von eine oder mehrere Kanten aufweisenden Teilflächen der elektrisch abgeschiedenen Überzugsschicht unter Vermeidung einer vollständigen Aushärtung,c) vollständige Aushärtung der elektrisch abgeschiedenen Überzugsschicht durch Einbrennen.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die radikalisch polymerisierbaren, olefinisch ungesättigten Doppelbindungen des thermisch aushärtbaren Bindemittelsystems Bestandteil der Bindemittel und/oder der Vernetzer sind.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sich bei den thermisch aushärtbaren Bindemittelsystemen um durch Kondensationsreaktionen und/oder Additionsreaktionen aushärtbare Bindemittelsysteme handelt.
- Verwendung des Verfahrens nach einem der Ansprüche 1 bis 3 zur Verringerung oder Verhinderung der Kantenflucht der auf den Kraftfahrzeugkarossen oder deren Teilen abgeschiedenen Elektrotauchlackschicht bei deren Einbrennen.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19921223 | 1999-05-07 | ||
| DE19921223A DE19921223A1 (de) | 1999-05-07 | 1999-05-07 | Verfahren zur Elektrotauchlackierung von Kanten aufweisenden Substraten |
| PCT/EP2000/003898 WO2000068467A1 (de) | 1999-05-07 | 2000-04-29 | Verfahren zur elektrotauchlackierung von kanten aufweisenden substraten |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1190119A1 EP1190119A1 (de) | 2002-03-27 |
| EP1190119B1 true EP1190119B1 (de) | 2003-03-05 |
Family
ID=7907393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00927113A Expired - Lifetime EP1190119B1 (de) | 1999-05-07 | 2000-04-29 | Verfahren zur elektrotauchlackierung von kanten aufweisenden substraten |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6736950B1 (de) |
| EP (1) | EP1190119B1 (de) |
| DE (2) | DE19921223A1 (de) |
| ES (1) | ES2189755T3 (de) |
| WO (1) | WO2000068467A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7713628B2 (en) * | 2005-05-31 | 2010-05-11 | Chemque, Inc. | Actinic radiation curable coating compositions |
| WO2017117169A1 (en) | 2015-12-31 | 2017-07-06 | Henkel Ag & Co. Kgaa | Low bake autodeposition coatings |
| WO2019072774A1 (de) | 2017-10-09 | 2019-04-18 | Basf Coatings Gmbh | Elektrotauchlacke enthaltend wenigstens eine triazin-verbindung |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040925A (en) * | 1974-05-02 | 1977-08-09 | Scm Corporation | Ultraviolet curing of electrocoating compositions |
| US4039414A (en) * | 1974-06-19 | 1977-08-02 | Scm Corporation | Ultraviolet curing of electrocoating compositions |
| US4066523A (en) * | 1976-02-17 | 1978-01-03 | Scm Corporation | Dual cure cathodic electrocoating composition |
| US4035274A (en) * | 1976-05-24 | 1977-07-12 | Scm Corporation | Dual cure cathodic electrocoating |
| EP0117233B1 (de) * | 1983-02-18 | 1987-08-26 | Ciba-Geigy Ag | Photohärtbare gefärbte Massen |
| US4540598A (en) * | 1983-08-17 | 1985-09-10 | Ciba-Geigy Corporation | Process for curing acid-curable finishes |
| DE3774004D1 (de) * | 1986-06-17 | 1991-11-28 | Ciba Geigy Ag | Verfahren zur haertung von polyurethanlacken. |
| DE4011045A1 (de) * | 1990-04-05 | 1991-10-10 | Fraunhofer Ges Forschung | Verfahren zum beschichten von kunststoffsubstraten und lack zur verwendung in diesem verfahren |
| DE4133290A1 (de) * | 1991-10-08 | 1993-04-15 | Herberts Gmbh | Verfahren zur herstellung von mehrschichtlackierungen unter verwendung von radikalisch und/oder kationisch polymerisierbaren klarlacken |
-
1999
- 1999-05-07 DE DE19921223A patent/DE19921223A1/de not_active Withdrawn
-
2000
- 2000-04-29 WO PCT/EP2000/003898 patent/WO2000068467A1/de not_active Ceased
- 2000-04-29 DE DE50001398T patent/DE50001398D1/de not_active Expired - Fee Related
- 2000-04-29 US US10/018,391 patent/US6736950B1/en not_active Expired - Fee Related
- 2000-04-29 ES ES00927113T patent/ES2189755T3/es not_active Expired - Lifetime
- 2000-04-29 EP EP00927113A patent/EP1190119B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1190119A1 (de) | 2002-03-27 |
| WO2000068467A1 (de) | 2000-11-16 |
| DE50001398D1 (de) | 2003-04-10 |
| ES2189755T3 (es) | 2003-07-16 |
| WO2000068467B1 (de) | 2001-02-15 |
| DE19921223A1 (de) | 2000-11-16 |
| US6736950B1 (en) | 2004-05-18 |
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