EP1032475A1 - Procede de laquage multicouche de substrats - Google Patents

Procede de laquage multicouche de substrats

Info

Publication number
EP1032475A1
EP1032475A1 EP98961139A EP98961139A EP1032475A1 EP 1032475 A1 EP1032475 A1 EP 1032475A1 EP 98961139 A EP98961139 A EP 98961139A EP 98961139 A EP98961139 A EP 98961139A EP 1032475 A1 EP1032475 A1 EP 1032475A1
Authority
EP
European Patent Office
Prior art keywords
meth
coating
basecoat
radiation
binders
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.)
Ceased
Application number
EP98961139A
Other languages
German (de)
English (en)
Inventor
Karin Maag
Helmut Löffler
Werner Lenhard
Christine Kurz
Frank-Jürgen Krumpolt
Volker Rekowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE1997151479 external-priority patent/DE19751479A1/de
Priority claimed from DE1997157083 external-priority patent/DE19757083A1/de
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP1032475A1 publication Critical patent/EP1032475A1/fr
Ceased legal-status Critical Current

Links

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
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat

Definitions

  • the invention relates to a method for multi-layer painting of substrates with a coloring and / or effect basecoat and a clear coat, which is used in particular in the field of vehicle and vehicle parts painting and in particular for refinishing.
  • Multi-layer vehicle refinishes generally consist of one
  • Basecoat / clearcoat topcoat which is applied to substrates which may have been precoated with primers, fillers or other coating agents.
  • EP-A-000 407 describes radiation-curable coating compositions based on an OH-functional polyester resin esterified with acrylic acid, one Vinyl compound, a photoinitiator and a polyisocyanate.
  • a 1st hardening step the radiation is hardened by means of UV light and in a 2nd hardening step the coating gets its final hardness through the OH / NCO crosslinking.
  • the second curing step can take place at 130 - 200 ° C or over several days at room temperature.
  • EP-A-540 884 describes a process for the production of a multi-layer coating for automotive serial painting by applying a clear coat on a dried or hardened basecoat layer, the clearcoat coating agent containing curable binders by free-radical and / or cationic polymerization, and the curing being carried out by means of high-energy radiation becomes. After the clear layer has been irradiated, the stoving process takes place, the basecoat and clearcoat being used together in e.g. 80 - 160 C.
  • EP-A-247 563 describes clearcoats curable by means of UV radiation
  • ⁇ oly (meth) acryloyl-functional compound a polyol mono (meth) acrylate, a polyisocyanate, a light stabilizer and a photoinitiator.
  • Some of the radiation-curable binders here also contain hydroxyl functions which can react with the polyisocyanate present and offer an additional curing option.
  • US-A-4 668 529 describes a UV-curable 1K filler coating agent for refinishing.
  • the binder is based on tripropylene glycol triacrylate and trimethylpropane triacrylate.
  • an epoxy resin based on a bisphenol A diglycidyl ether is included.
  • the object of the invention was to provide a method for producing a multilayer coating, in particular refinishing coating, which enables a significant reduction in the solvent emission in the overall structure and has short drying times.
  • very good water resistance and hardness as well as very good interlayer adhesion and resistance to dissolving of the basecoat with respect to the lacquer layers below and above should be guaranteed.
  • the object is achieved by a process for producing a multilayer coating, in which a coloring and / or effect-imparting basecoat coating agent is applied to a substrate which may have been pre-coated with a primer and / or filler coating agent and / or further coating agents, and then onto the coloring and / or effect-imparting basecoat layer, a clearcoat layer is applied, characterized in that the coloring and / or effect-imparting basecoat coating agent used is one which contains, under the action of high-energy radiation, binders curable by free-radical and / or cationic polymerization.
  • the multi-layer coatings obtained with the process according to the invention show the same high level of properties required for a coating, in particular a refinishing coating, with respect to properties such as hardness, scratch resistance, water and chemical resistance as multi-layer coatings which were created with the basecoat / clearcoat layers customary for vehicle (repair) painting. It was also surprising that various properties, e.g. Interlayer adhesion, resistance to dissolving against layers of paint above or below, resistance to fuel, tree resin and pancreatin, could still be significantly improved.
  • the color and / or effect basecoats which can be used in the process according to the invention are coating compositions which crosslink by means of high-energy radiation via free-radical and / or cationic polymerization.
  • These can be aqueous systems with a high solids content, for example with a solids content of 50 to 95% by weight, which are present as an emulsion, but the systems can also be in a solvent-containing form. However, it can also be a 100% coating agent that can be applied without solvent and without water.
  • Basecoats which can be used according to the invention can be all of the customary radiation-curable binders or mixtures thereof which are known to the person skilled in the art and are described in the literature. They are either binders which can be crosslinked by free-radical polymerization or by cationic polymerization. In the former, radicals are generated by the action of high-energy radiation on the photoinitiators, which then trigger the crosslinking reaction. In the case of the cationically curing systems, Lewis acids are formed by the irradiation from initiators, which in turn trigger the crosslinking reaction.
  • the free-radically curing binders can e.g. to prepolymers or
  • Act oligomers which have free-radically polymerizable olefinic double bonds in the molecule.
  • prepolymers or oligomers are (meth) acrylic-functional (meth) acrylic copolymers, epoxy resin (meth) acrylates, polyester (meth) acrylates, polyether (meth) acrylates, polyurethane (meth) acrylates,, amino (meth) acrylates, silicone (meth) acrylates, melamine (meth) acrylates, unsaturated
  • Polyurethane or unsaturated polyester are Polyurethane or unsaturated polyester.
  • the number average molecular weight (Mn) of these compounds is preferably from 200 to 10,000.
  • the binders can be used individually or in a mixture.
  • the prepolymers can be used in combination with reactive diluents, i.e. reactive polymerizable liquid monomers.
  • the reactive diluents are generally used in amounts of 1-50% by weight, preferably 5-30% by weight, based on the total weight of prepolymer and reactive diluent.
  • the reactive diluents can be mono-, di- or polyunsaturated. Examples of monounsaturated reactive diluents are: (meth) acrylic acid and its esters,
  • unsaturated reactive diluents are: di (meth) acrylates such as alkylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, vinyl (meth) acrylate, allyl (meth) acrylate, divinylbenzene, dipropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate.
  • di (meth) acrylates such as alkylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, vinyl (meth) acrylate, allyl (meth) acrylate, divinylbenzene, dipropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate.
  • polyunsaturated reactive diluents are: glycerol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate.
  • the reactive diluents can be used individually or in a mixture.
  • Diacrylates such as dipropylene glycol diacrylate, tripropylene glycol diacrylate and / or hexanediol diacrylate are preferably used as reactive diluents.
  • binders known to the person skilled in the art and described in the literature can be used as binders for cationically polymerizable systems.
  • These can be, for example, polyfunctional epoxy oligomers which contain more than two epoxy groups in the molecule.
  • Glycidyl ether epoxy urethane resins, glycerol triglycidyl ether,
  • the number average molecular weight (Mn) of the polyepoxide compounds is preferably less than 10,000.
  • Reactive diluents such as e.g. Cyclohexene oxide, butene oxide, butanediol diglycidyl ether or hexanediol diglycidyl ether can be used.
  • the binder systems curing under the action of radiation contain photoinitiators.
  • Suitable photoinitiators are, for example, those which
  • Absorb wavelength range from 190 to 600 nm.
  • photoinitiators for radical curing systems are benzoin and derivatives, acetophenone and derivatives, such as e.g. 2,2-diacetoxyacetophenone, benzophenone and derivatives, thioxanthone and derivatives, anthraquinone, 1-
  • Benzoylcyclohexanol, organophosphorus compounds e.g. Acylphosphine oxides.
  • the photoinitiators are used, for example, in amounts of 0.1-7% by weight, preferably 0.5-5% by weight, based on the sum of free-radically polymerizable prepolymers, reactive diluents and photoinitiators.
  • the photoinitiators can be used individually or in combination.
  • Photoinitiators for cationic curing systems are substances known as onium salts, which release Lewis acids photolytically under the action of radiation. Examples include diazonium salts, sulfonium salts or iodonium salts. Triarylsulfonium salts are preferred.
  • the photoinitiators for cationically curing systems can be used individually or as mixtures in amounts of 0.5 to 5% by weight, based on the sum of cationically polymerizable prepolymers, reactive diluents and initiators.
  • free-radically curing systems various cationically curing systems or free-radically and cationically curing systems can be combined with one another to produce the basecoats which are curable by means of high-energy radiation. Radically curing systems are preferably used.
  • Preferred free-radically curing binders are those based on polyurethane (meth) acrylates, polyester (meth) acrylates and (meth) acrylic-functional poly (meth) acrylates. Those based on aliphatic polyurethane (meth) acrylates and / or aliphatic (meth) acrylic-functional poly (meth) acrylates are particularly preferred.
  • the basecoats which can be used in the process according to the invention can, in addition to the binders curable by means of high-energy radiation, also contain binders which harden or dry by other mechanisms. The amount of such additional
  • the binder is, for example, up to 50% by weight, based on the UV-curing binder.
  • physically drying binders or chemically crosslinkable binders can also be included.
  • the physically drying binders are, for example, polyurethane, polyurethane urea, polyester, polyester urethane and / or polyacrylate resins which are known to the person skilled in the art and which can optionally be present in combination with melamine resins or cellulose esters. Modifications of the resins mentioned may also be involved, for example acrylated or silicon-modified polyurethane resins and / or polyester resins or so-called lap polymers, ie acrylate copolymers prepared in the presence of, for example, polyesters or polyurethanes.
  • Two-component binder systems based on a hydroxy-functional and an isocyanate-functional component can be used as chemically crosslinkable binders hydroxy-functional and an anhydride component or a polyamine and an acryloyl-functional component can be used.
  • the additional binders that can be used can be aqueous or solvent-based.
  • the binder systems mentioned by way of example are known to the person skilled in the art and are described in detail in the literature. If, in addition to the radiation-curing binders, other binders are used in the basecoats, those based on a hydroxy-functional and an isocyanate-functional component can preferably be used.
  • the basecoat coating compositions which can be used in the process according to the invention contain coloring and / or effect pigments.
  • All paint-typical pigments of organic or inorganic nature are suitable as color pigments.
  • inorganic or organic color pigments are titanium dioxide, micronized titanium dioxide, iron oxide pigments, carbon black, azo pigments, phthalocyanine pigments, quinacridone and pyrrolopyrrole pigments.
  • effect pigments are particularly characterized by a platelet-like structure.
  • effect pigments are: metal pigments, e.g. made of aluminum, copper or other metals; Interference pigments, e.g. metal oxide coated metal pigments, e.g. Titanium dioxide coated or mixed oxide coated
  • the basecoat coating compositions which can be used in the process according to the invention can contain fillers and / or customary paint additives.
  • the additives are the usual additives that can be used in the paint sector.
  • Examples of such additives are leveling agents, for example based on (meth) acrylic homopolymers or silicone oils, rheology-influencing agents such as highly disperse silica or polymeric urea compounds, thickeners such as cross-linked polycarboxylic acid or polyurethane, anti-foaming agents, wetting and elasticizing agents and light stabilizers.
  • fillers are silicon dioxide, barium sulfate and talc. The additives and fillers are used in customary amounts known to the person skilled in the art.
  • the basecoats which can be used in the process according to the invention can be formulated without solvents. Their solids content is then 100% by weight. However, the basecoats can also contain small amounts of organic solvents and / or water. The solvents are common paint solvents.
  • solvents are monohydric or polyhydric alcohols, e.g. Propanol, butanol, hexanol; Glycol ethers or esters, e.g. Diethylene glycol dialkyl ether, dipropylene glycol dialkyl ether, each with Cl to C6 alkyl, ethoxypropanol, butyl glycol; Glycols, e.g. Ethylene glycol, propylene glycol and their oligomers, esters such as e.g. Butyl acetate, amyl acetate, alkyl pyrrolidones, e.g.
  • monohydric or polyhydric alcohols e.g. Propanol, butanol, hexanol
  • Glycol ethers or esters e.g. Diethylene glycol dialkyl ether, dipropylene glycol dialkyl ether, each with Cl to C6 alkyl, ethoxypropanol,
  • N-methylpyrrolidone and ketones e.g. Methyl ethyl ketone, acetone, cyclohexanone; aromatic or aliphatic hydrocarbons, e.g. Toluene, xylene or linear or branched aliphatic C6-C12 hydrocarbons.
  • the color and / or effect basecoat layer is applied in the method according to the invention to optionally precoated substrates.
  • Preferred substrates are metal or plastic substrates.
  • the basecoats are preferably applied to customary primer, filler or other intermediate layers, such as are used for multi-coat painting in the motor vehicle sector. In particular, they are based on a
  • Vehicle refinishing applied to pre-coated vehicle bodies or their parts.
  • the application takes place according to known methods, preferably by spray application.
  • the basecoat can, for example, be applied to customary solvent- or water-based filler, primer or other intermediate layers.
  • the Filler, primer or intermediate layers can already be cured or pre-dried or intermediate dried. That is, the basecoat can be applied, for example, to an old paint job, a cured refinish paint job, a pre-dried or wet-on-wet process using IR radiation, if necessary after a short airing, on a refinish job job of the type mentioned above.
  • the coating agents used to produce the filler, primer or intermediate layers can be based on the physically drying or chemically crosslinking fuel systems that are customary and suitable for vehicle painting.
  • physically drying binders are solvent-based or water-based polyurethane, polyurethane urea, polyester, polyester urethanes or polyacrylate resins, as well as their modifications.
  • solvent-based or water-based chemically crosslinking binders are systems based on oxidatively drying resins, peroxide-curing unsaturated polyesters and acid-curing polyvinyl butyrals and on the basis of binders containing hydroxyl groups, which are crosslinkable with isocyanate-, amino-functional or anhydride-functional components, based on epoxy / polyamine or acryloyl / Polyamine systems.
  • UV radiation sources are preferably those with emissions in the wavelength range from 180 to 420 nm, in particular from 200 to 400 nm.
  • UV radiation sources are optionally doped high-pressure mercury, medium-pressure and low-pressure lamps, gas discharge tubes, such as e.g. Xenon low-pressure lamps, pulsed and non-pulsed UV lasers, UV spotlights, such as UV emitting diodes and black light tubes. Irradiation is preferably carried out with pulsed UV radiation.
  • So-called high-energy electron flash devices (in short: UV flash lamps) are then particularly preferably used as the radiation source.
  • Preferred UV flash lamps emit light from one
  • UV flash lamps preferably contain a plurality of flash tubes, for example quartz tubes filled with inert gas such as xenon.
  • the UV flash lamps should have an illuminance of at least 10 megalux, preferably 10 - 80 megalux per flash discharge on the surface of the coating to be cured.
  • the electrical power per flash discharge should preferably be 1 - 10 kJoules.
  • UV flash lamps are preferably portable devices that can be positioned directly in front of a damaged area to be repaired. UV flash lamps that can be used are described, for example, in WO-A-9411123 and in EP-A-525 340. UV flash lamps are commercially available. Depending on the application conditions and requirements, one or more UV
  • the basecoat layers can be cured by a plurality of successive lightning discharges. 1 to 40 successive lightning discharges are preferably triggered. The distance between the UV flash lamp and the one to be irradiated
  • the substrate surface can be 5-50 cm, preferably 10-25 cm, particularly preferably 15-20 cm.
  • the shielding of the UV lamps to prevent radiation leakage can be e.g. by using an appropriately lined protective housing around the transportable lamp unit or with the help of other safety measures known to the person skilled in the art.
  • the total irradiation time is in the range of a few seconds, for example in the range from 3 milliseconds to 400 seconds, preferably from 4 to 160 seconds, depending on the number of flash discharges selected.
  • the flashes can be triggered, for example, every 4 seconds.
  • the UV flash lamps are ready for use at any time, i.e. they do not require a baking time and can remain switched off between two curing or irradiation processes that are somewhat separated in time, without the loss of time resulting from a baking phase during the renewed irradiation process.
  • the temperatures generated by means of UV radiation (UV flash lamps) on the coating are generally sufficient to cure the additional binders present.
  • a separate hardening step is not necessary.
  • a clear lacquer coating is applied to the basecoat film either after it has completely hardened or wet-on-wet, if appropriate after briefly flashing off.
  • Suitable clearcoats are all solvent-based or water-based clearcoats which are customary in vehicle painting, in particular repair painting, and are known to the person skilled in the art.
  • solvent-based or aqueous clear lacquers based on binders containing hydroxyl groups and / or amino groups and polyisocyanate crosslinkers and on binders based on amino groups and acryloyl-functional binders.
  • the clearcoat layer can be cured at room temperature or forced at, for example, 40-80 ° C. Solvent-based or aqueous are preferred in the process according to the invention
  • a further preferred embodiment of the process according to the invention consists in using as clearcoat one which contains binders curable by means of high-energy radiation. For those curable by means of high-energy radiation
  • Binders are, for example, the radiation-curable binders already described above, which can be used in the basecoat. Binders based on aliphatic polyurethane (meth) acrylates and / or (meth) acrylic-functional poly (meth) acrylates are particularly preferably used in the basecoat and in the clearcoat by means of high-energy radiation.
  • the clear lacquer can be applied wet-on-wet, if necessary after briefly flashing off, to the uncured base lacquer. Then the irradiation with UV rays takes place, with basecoat and clearcoat be hardened together in one work step.
  • UV radiation-curable clearcoats are used in the process according to the invention, special coated transparent fillers can advantageously be present in addition to the additives customary for a clearcoat to increase the scratch resistance.
  • Fillers that can be used here are, for example, micronized aluminum oxide or micronized silicon oxide. These transparent fillers are coated with compounds that contain UV-curable groups, for example with acrylic-functional silanes, and are therefore included in the radiation curing of the clear lacquer.
  • the fillers are available as commercial products, for example under the name AKTISIL * .
  • the process according to the invention gives multilayer coatings with great hardness, high scratch resistance and high gloss.
  • the individual layers of paint show very good interlayer adhesion and resistance to dissolving of the paint layers below or above. The latter properties are particularly pronounced if, in addition to the basecoat, the clearcoat layer also contains binders curable by means of high-energy radiation in the multilayer structure and the same radiation-curable binders and / or reactive thinners are used for both paint layers.
  • the coatings obtained with the method according to the invention otherwise meet the requirements for a refinish paint system in the field of vehicle painting.
  • the drying or hardening of the coatings, in particular the basecoat / clearcoat structure takes place in a greatly reduced time compared to repair lacquer structures which have been dried or hardened in the customary manner.
  • Multi-layer construction must or should be dispensed with, for example in the painting of vehicle interior areas, such as the engine compartment, trunk, door rebates, or in the Painting textured plastic surfaces, the clear coat can be easily omitted.
  • the basecoat hardened by means of high-energy radiation fulfills the function of the clearcoat easily and without any modification, for example with regard to hardness and scratch resistance.
  • the method according to the invention can advantageously be used in the
  • Vehicle refinishing especially of vehicle parts, smaller damaged areas and for spot repair.
  • HALS type 1 part of a commercially available light stabilizer (HALS type) 1 part of a commercially available UV absorber (benzotriazole type) Creation of a multilayer structure
  • the basecoat produced as described above was applied to KTL-primed and coated with customary solvent-based two-component polyurethane fillers in a resulting dry film layer thickness of approx. 60 ⁇ m.
  • Flash-off at room temperature exposes the basecoat to radiation from a UV flash lamp (3500 Ws). It is irradiated with 20 flashes (approx. 80 s).
  • the clear lacquer produced as described above is applied in a resulting dry film layer thickness of approximately 60 ⁇ m.
  • the clear lacquer layer is exposed to the radiation by a UV flash lamp (3500 Ws). It is irradiated with 20 flashes (approx. 80 s).
  • the cured basecoat is overcoated with a solvent-based, conventional 2-component polyurethane clearcoat and cured in the customary manner.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de préparation d'un laquage multicouche, selon lequel un agent de recouvrement de vernis de base conférant la couleur et/ou à effet est appliqué sur un substrat éventuellement recouvert au préalable d'un agent de recouvrement d'apprêt et/ou d'un agent de recouvrement de charge et/ou d'autres agents de recouvrement. Une couche de vernis clair est ensuite appliquée sur la couche de vernis de base conférant la couleur et/ou à effet. Selon ce procédé, l'agent de recouvrement de vernis de base qui confère la couleur et/ou est à effet, utilisé, contient des liants durcissant sous l'effet de rayonnements de haute énergie, par polymérisation radicalaire et/ou cationique.
EP98961139A 1997-11-20 1998-11-05 Procede de laquage multicouche de substrats Ceased EP1032475A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1997151479 DE19751479A1 (de) 1997-11-20 1997-11-20 Verfahren zur mehrschichtigen Lackierung von Substraten
DE19751479 1997-11-20
DE19757083 1997-12-20
DE1997157083 DE19757083A1 (de) 1997-12-20 1997-12-20 Verfahren zur mehrschichtigen Lackierung von Substraten
PCT/EP1998/007070 WO1999026732A1 (fr) 1997-11-20 1998-11-05 Procede de laquage multicouche de substrats

Publications (1)

Publication Number Publication Date
EP1032475A1 true EP1032475A1 (fr) 2000-09-06

Family

ID=26041767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98961139A Ceased EP1032475A1 (fr) 1997-11-20 1998-11-05 Procede de laquage multicouche de substrats

Country Status (5)

Country Link
US (1) US6534130B1 (fr)
EP (1) EP1032475A1 (fr)
JP (1) JP2001523572A (fr)
CA (1) CA2310747A1 (fr)
WO (1) WO1999026732A1 (fr)

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GB0007728D0 (en) * 2000-03-31 2000-05-17 Ppg Ind Ohio Inc Coating composition
JP5133481B2 (ja) * 2001-09-25 2013-01-30 関西ペイント株式会社 補修塗装方法
US6958171B2 (en) * 2001-12-14 2005-10-25 E. I. Du Pont De Nemours And Company Process for repairing coated substrate surfaces
DE10233521A1 (de) 2002-07-23 2004-02-05 Basf Ag Strahlungshärtbare Lacksysteme mit tieftemperaturelastischer Unterschicht
US20040033376A1 (en) * 2002-08-19 2004-02-19 Hiroshi Mori Thin-film layer, thin-film layer fabrication apparatus and thin-film device
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US6534130B1 (en) 2003-03-18
WO1999026732A1 (fr) 1999-06-03
CA2310747A1 (fr) 1999-06-03

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