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Process for producing a multilayer coating

A coating and coating technology, applied in the direction of coating, metal material coating process, device for coating liquid on the surface, etc., can solve the problem of not being able to provide adhesion to metal substrates, etc.

Active Publication Date: 2015-04-29
AXALTA COATING SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It has not been possible to date to provide a manufacturable surfacer or a manufacturable combination of an adhesion primer and a surfacer with acceptable adhesion to metal substrates that is capable of sanding after a short air drying time without substantially affecting other important coating properties

Method used

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  • Process for producing a multilayer coating
  • Process for producing a multilayer coating
  • Process for producing a multilayer coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0066] According to one embodiment, the surfacer coating composition comprises at least one compound comprising at least one alkoxysilane group and at least one epoxy group (epoxysilane compound). The epoxysilane compound can be a monomeric, oligomeric or polymeric compound. Examples of suitable monomeric, oligomeric or polymeric epoxysilane compounds are those having at least one alkoxysilane group according to formula (II).

[0067]

[0068] wherein R6, R7, R8 are the same or different organic groups having 1-30 carbon atoms per molecule, with the proviso that at least one of the residues R6, R7 and R8 is an alkoxy group having 1-4 carbon atoms base.

[0069] In addition to the alkoxysilane groups, monomeric, polymeric and oligomeric alkoxysilane compounds also contain at least one epoxy group. The epoxy silane compound is preferably a monomeric compound, more preferably a compound of general formula (III):

[0070]

[0071] where Z represents residues where m is 1-...

Embodiment 1

[0096] Example 1 - Preparation of pretreatment composition

[0097] Pretreatment compositions 1.1 and 1.2 were prepared with the ingredients shown in Table 1.

[0098] Table 1

[0099]

[0100] In addition to this, commercially available pretreatment composition 1.3 and pretreatment wipes 1.4 and 1.5 were used:

Embodiment 13

[0101] Example 1.3: 5717S - Phosphoric acid based metal conditioner from DuPont Refinish

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PUM

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Abstract

The invention relates to a productive process for multilayer coating, in particular for multilayer repair coating of metal substrates, such as vehicle bodies and vehicle body parts. The process comprises the steps 1. pretreating the metal substrate to be coated with an acidic aqueous composition comprising a) phosphate ions and / or b) at least one water-soluble titanium and / or zirconium compound, and c) water; 2. optionally flashing off the pretreated metal substrate, 3. applying a surfacer layer of an organic-solvent based surfacer coating composition comprising A) at least one polyaspartic acid ester, B) at least one polyisocyanate cross-linking agent with free isocyanate groups, C) pigments and / or extenders, and D) at least one organic solvent; and 4. curing the surfacer layer. Subsequently a top coat layer of a top coat coating composition is applied.

Description

technical field [0001] The present invention relates to a method for producing multilayer coatings on metallic substrates, which can be used in particular for the coating and refinishing of vehicle bodies and body parts. Background technique [0002] Multilayer coatings consisting of, for example, a primer, a surfacer, a base coat layer and a clear coat layer are typical in vehicle coating and vehicle refinish coating. coating structure. Adhesion of the entire multilayer coating to the substrate is very important. Therefore, primer solutions and undercoat systems are required to have good adhesion and corrosion resistance, which are suitable for direct coating to metal substrates. [0003] Most current down-to-metal repair coating methods use polyvinyl butyral based wash primers and two-component polyurethane surfacers to achieve acceptable adhesion and good quality applied film. The main disadvantage of these methods is insufficient production capacity. Typically at lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38B05D3/00C09D175/02
CPCC23C22/34C09D5/002C09D5/084C09D7/40C23C22/361C23C22/73C23C22/83
Inventor K·维辛
Owner AXALTA COATING SYST GMBH
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