Classifications

• • 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
  • B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
• • 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
  • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
• • 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
• • 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
  • B05D7/577—Three layers or more the last layer being a clear coat some layers being coated "wet-on-wet", the others not

Definitions

• the present invention relates to a novel process for repainting multicoat color and / or effect paint systems containing at least one color and / or effect basecoat (A), prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least one liquid clearcoat (B).
• the present invention relates to a novel process for overcoating by means of electrostatic spray application (ESTA) produced, damaged or undamaged, multicoat color and / or effect paint systems at the automobile manufacturer in the line.
• ESA electrostatic spray application
• EP 0 521 040 B2 is a method for producing a multi-layer refinish in the usual sense, in which one applies in the area of the damaged area in the series coating initially a pigment-free, aqueous, film-forming coating agent before the repair water-based paint is applied.
• the coating agent may be a pigment-free extract of the repair water-based paint.
• a clearcoat is then applied wet-on-wet to the waterborne basecoat, after which the existing coats are cured together. This process represents a significant advance in refinishing in the usual sense.
• the known refinishing process can not solve the above-mentioned problems that occur when overpainting color and / or effect multicoat paint systems in line at the car manufacturer, because it is this very different amounts of coating materials and a very different logistics required than for the refinish in the usual sense, which is carried out especially in car paint shops.
• the object of the present invention is to provide a novel process for recoating multicoat color and / or effect paint systems, in particular by means of electrostatic spray application (ESTA) and curing of multicoat paint systems comprising at least one color and / or effect basecoat (A) prepared from at least one Waterborne basecoat (A), and at least one clearcoat (B), prepared from at least one liquid clearcoat (B), which no longer has the disadvantages of the prior art and the pneumatically wet-in-wet applied and cured, color and / or multicoat paint systems which do not suffer any disadvantageous hue shift and / or disadvantageous change in the optical effect, in particular the metallic effect, in comparison with the original or OEM finishes.
• ESA electrostatic spray application
• the multicoat paint systems produced with the aid of the new process should adhere very well to OEM (OEM) finishes.
• the new process should be especially suitable for overcoating OEM (OEM) paints by the car manufacturer, where problems quite different from those encountered in car refinishing in the usual sense occur.
• the new process for overcoating multicoat color and / or effect varnishes comprising at least one color and / or effect basecoat (A) prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least a liquid clearcoat (B), referred to as "inventive method”.
• the process according to the invention is used for overpainting multicoat color and / or effect, preferably color and effect or effect, multicoat systems. This can be done for repair purposes, for example if the multi-layer coatings have been damaged by mechanical and / or chemical action. However, the overcoating can also be carried out with undamaged multi-layer coatings, for example if a change, in particular adaptation, of the hue and / or the optical effect is or are required.
• the multicoat paint systems can provide protection, decoration, increase of scratch and abrasion resistance and corrosion resistance, improvement of cleaning performance, improvement of demolding and reduction of adhesion, generation of a Anti-fog effect, the generation of anti-reflection properties and / or increasing the bursting pressure serve. They can be used on a wide variety of substrates. These may be substrates of metal, plastic, glass, ceramics, porcelain, clay, concrete, natural stone, artificial stone, wood, paper, textile, leather and composites of these materials. Preferably, it is substrates of metal or plastic.
• the multi-layer coatings in many technical fields, such as for the painting of motor vehicle bodies and parts thereof, motor vehicles in indoor and outdoor, indoor and outdoor buildings, doors, windows, furniture and glass hollow bodies and in the context of industrial paint for painting Small parts, coils, containers, packaging, electrical components and white goods, are used.
• the multicoat paint systems preferably serve for the protection and decoration of motor vehicle bodies, in particular of automobile or automobile bodies.
• the so-called automobile construction of the multicoat color and / or effect paint systems as described in US Pat Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 50, "Automotive Painting” is generally defined as electrodeposition coating, primer, surfacer or antistonechip primer, basecoat and clearcoat.
• the multicoat color and / or effect paint systems are prepared by applying a primer or filler to the electrocoated motor vehicle bodies or the attachments, which in the vast majority of cases is thermally cured on its own. At least one, in particular one, of the resulting surfacer coat or antistonechip primer is then subjected to the so-called wet-on-wet process.
• actinic radiation electromagnetic radiation, such as near infrared (NIR), visible light, UV radiation or X-radiation, in particular UV radiation, and / or corpuscular radiation, such as electron radiation, can be used.
• waterborne basecoat materials (A) it is possible to use all customary and known waterborne basecoat materials of the kind customarily used for the production of multicoat color and / or effect coating systems for the OEM of automobiles, in particular by the wet-on-wet process.
• Highly suitable aqueous basecoats are known, for example, from the patent applications EP 0 089 497 A1 . EP 0 256 540 A1 . EP 0 260 447 A1 . EP 0 297 576 A1 . WO 96/12747 . EP 0 523 610 A1 . EP 0 228 003 A1 . EP0397806A1 . EP0574417A1 . EP0531510A1 . EP0581211A1 . EP 0 708 788 A1 . EP 0 593 454 A1 . DE-A-43 28 092 A1 . EP 0 299 148 A1 . EP 0 394 737 A1 .
• they may contain at least one saturated, unsaturated and / or with olefinically unsaturated compounds grafted, ionically and / or nonionically stabilized polyurethane as a binder.
• they may contain at least one crosslinking agent.
• the crosslinking agent is selected from the group consisting of aminoplast resins, blocked polyisocyanates, and tris (alkoxycarbonylamino) triazines.
• Suitable liquid clearcoats (B) for the preparation of the clearcoats are all customary and known one-component (1K), two-component (2K) or multicomponent (3K, 4K) clearcoats, powder slurry clearcoats, UV-curable clearcoats and sealers.
• Thermally curable one-component (1K), two-component (2K) or multi-component (3K, 4K) clearcoat materials are disclosed in the patent applications DE 42 04 518 A1 .
• EP 0 604 992 A1 or EP 0 596 460 A1 the international patent applications WO 94/10211 .
• WO 94/10213 WO 94/22969 or WO 92/22615 or the American patents US 5,474,811 A1 .
• One-component (1K) clearcoat materials (B), in particular solvent-containing comprise, as is known, hydroxyl-containing binders and crosslinking agents, such as blocked polyisocyanates, tris (alkoxycarbonylamino) triazines and / or aminoplast resins.
• they contain as binders polymers with pendant carbamate and / or allophanate groups and optionally carbamate- and / or allophanate-modified aminoplast resins as crosslinking agents (cf US Pat US 5,474,811 A1 . US 5,356,669 A1 or US 5,605,965 A1 . the international patent applications WO 94/10211 . WO 94/10212 or WO 94/10213 or the European patent applications EP 0 594 068 A1 . EP 0 594 071 A1 or EP 0 594 142 A1 ).
• Thermally curable powder slurry clearcoats are known for example from the American patent specification US 4,268,542 A1 and the German patent applications DE 195 18 392 A1 .
• Powder slurry clearcoats (B) are known to contain powder clearcoats dispersed in an aqueous medium.
• UV-curable clearcoats for example, from the European patent applications EP 0 928 800 A1 . EP 0 636 669 A1 . EP 0 410 242 A1 . 0 783 534 A1 . EP 0 650 978 A1 . EP 0 650 979 A1 . EP 0 650 985 A1 . EP 0 540 884 A1 . EP 0 568 967 A1 . EP 0 054 505 A1 or EP 0 002 866 A1 , the German patent applications DE 197 09 467 A1 . DE 42 03 278 A1 . DE 33 16 593 A1 . DE 38 36 370 A1 .
• clearcoats (B) are known, which can be crosslinked thermally and with actinic radiation (see the patent applications EP 0 982 800 A1 . EP 0 844 286 A1 . WO 98/40170 and DE 199 14 896 A1 ), which is also referred to by the experts as dual cure.
• suitable dual-cure clearcoats (B) are one-component clearcoats or two-component clearcoats which additionally contain actinic radiation-activatable functional groups and / or additional constituents with such functional groups.
• Acrylate groups are particularly preferably used as activatable with actinic radiation functional groups.
• suitable additional ingredients are isocyanato acrylates, urethane acrylates or multifunctional acrylates such as dipentaerythritol pentaacrylate.
• sealers (B) are from the German patents DE 43 03 570 A1 . DE 34 07 087 A1 . DE 40 11 045 A1 . DE 40 25 215 A1 . DE 38 28 098 A1 . DE 40 20 316 A1 or DE 41 22 743 A1 known. Also suitable are organically modified ceramic materials that are marketed under the brand name ORMOCER®.
• the outer surface of a standard finish is spray-applied by pneumatic spraying (cf. Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 537, "Spray Gun” ) with at least one of opaque pigments substantially or completely free, in particular a completely pigment-free, extract from a Water-based paint, which is the aqueous basecoat (A) or one of the water-based paints (A), from or from which the basecoats (A) have been prepared, substantially identical or identical, coated.
• OEM a standard finish
• pneumatic spraying cf. Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 537, "Spray Gun”
• a Water-based paint which is the aqueous basecoat (A) or one of the water-based paints (A), from or from which the basecoats (A) have been prepared, substantially identical or identical, coated.
• the waterborne basecoat is then considered to be “substantially equivalent” to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents which characterize the technological properties.
• An excerpt i. S. of the invention is thus a coating material which contains the same or the same binder and optionally the same or the same crosslinking agent, such as the water-based paint (A) in question.
• the concentration of the binder and optionally of the crosslinking agent in the extract may differ from or be the same as the concentration in the waterborne basecoat material (A).
• the extracts Preferably, in the extracts lower concentrations than in the corresponding water-based paint (A) are used.
• the extract may contain the same additives in the same or different amounts as the water base lacquer (A) in question, whereby it is possible to dispense with the use of friction resins. It is also possible to use additives other than those used in the aqueous basecoat (A).
• substantially free of covering pigments means that the relevant extract, based on its total amount, can contain up to 20, preferably up to 10 and in particular up to 5% by weight of opacifying coloring pigments, because This is the case with the large-area overpainting of multicoat paint systems, in particular series finishes, which can facilitate color matching.
• the extract is a Clear color which is completely free from opaque pigments and which may contain non-opaque, translucent pigments.
• the extract is a pigment-free Klariack.
• the extract in the sense mentioned above the water-based paint (A) or one of the water-based paints (A) corresponds, from or from which the base coat (A) of the multi-layer coating has been prepared.
• the extract is pneumatically applied in the first process step with an injection pressure of 2.5 to 5 bar.
• the extract is applied in a total layer thickness such that after hardening in the last process step a dry layer thickness of 2 to 50, particularly preferably 5 to 45 and in particular 5 to 40 ⁇ m results.
• the resulting layer of the extract is flashed off in the second Versmallestyakift and / or dried, without curing it completely.
• the waterborne basecoat is then considered to be "substantially equivalent" to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents that characterize the technological properties.
• an injection pressure of 0.5 to 0.9 bar is applied.
• the aqueous basecoat is applied in a total wet layer thickness, that after curing in the last process step results in a total dry layer thickness of 5 to 50, preferably 7.5 to 40 and in particular 10 to 30 microns.
• the resulting waterborne basecoat layer is flashed off and / or dried in the next process step without completely hardening it.
• the deaeration and / or drying of the excipient and waterborne coating layers described above can be accomplished in conventional and known catfish by increasing the temperature of the layers, passing laminar airflows over the layers, and / or reducing the atmospheric humidity of the surrounding atmosphere ,
• the aerated and / or dried waterborne basecoat layer is coated in a further process step with at least one, in particular one, liquid clearcoat.
• a liquid Klariack is used, which is curable thermally and / or with actinic radiation, preferably thermally or thermally and with actinic radiation.
• varnishes which essentially correspond to the above-described aqueous or conventional, in particular conventional, one-component dialcohols (B), the Zwolkomponentenkiarlacken (B) or the Dual-Cure clearcoats (B) or with
• the varnish and the varnish (B) are then regarded as "substantially equivalent" to each other if they are substantially or completely identical in their essential constituents which characterize the technological properties.
• the clearcoats are very particularly preferably identical to the clearcoats (B) from which the clearcoatings (B) of the multicoat paint systems have been produced.
• the resulting clearcoat layer (s) is / are preferably applied in a wet coating thickness such that after curing in the last process step a total dry film thickness of 10 to 100, more preferably 15 to 80, particularly preferably 20 to 70 and in particular 25 to 60 ⁇ m results ,
• the clearcoat layer (s) are flashed off and / or dried prior to curing in the last process step in a conventional manner, and the above-described measures for accelerating the venting and / or drying can be used.
• the resulting clearcoat layer (s), the waterborne basecoat layer and the layer from the extract, as well as any further uncured layers are cured together.
• the layers are cured thermally or thermally and with actinic radiation, and the conventional and known methods and devices can be used.
• the process according to the invention can be used for the voluminous overcoating of undamaged and damaged multicoat paint systems, in particular of OEM (OEM) finishes. Both damaged multi-layer coatings, the damaged areas as well as the entire adjacent area to a boundary, such as an edge or a decorative strip, over-painted.
• OEM OEM
• the process according to the invention is particularly economical because the same starting materials as for the water-based paints (A) themselves and for the production of secondary coatings the same waterborne basecoats (A) as for the production of multicoat paint systems are used for the preparation of the extracts of waterborne basecoats (A).
• the economy can be further increased if the same clearcoats are used for the production of the secondary finishes as for the preparation of the clearcoats (B) of the multi-layer finishes (OEM). Overall, this can significantly simplify the storage in the paint shops.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=29285181

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (10)

Family Cites Families (12)

• 2002
  • 2002-05-08 DE DE10220414A patent/DE10220414B4/de not_active Expired - Fee Related
• 2003
  • 2003-04-28 PL PL03374256A patent/PL374256A1/pl unknown
  • 2003-04-28 EP EP03717322A patent/EP1501899B1/de not_active Expired - Lifetime
  • 2003-04-28 AT AT03717322T patent/ATE446343T1/de not_active IP Right Cessation
  • 2003-04-28 DE DE50312053T patent/DE50312053D1/de not_active Expired - Lifetime
  • 2003-04-28 JP JP2004503565A patent/JP4891542B2/ja not_active Expired - Lifetime
  • 2003-04-28 AU AU2003222311A patent/AU2003222311A1/en not_active Abandoned
  • 2003-04-28 KR KR10-2004-7017836A patent/KR20050004835A/ko not_active Withdrawn
  • 2003-04-28 WO PCT/EP2003/004392 patent/WO2003095566A1/de not_active Ceased
  • 2003-04-28 US US10/511,080 patent/US7763322B2/en not_active Expired - Fee Related

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