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Finish paint composite and preparation method and use method thereof

A composition and topcoat technology, applied in the direction of pretreatment surface, device for coating liquid on surface, polyurea/polyurethane coating, etc., can solve the problem of high photoinitiator content, insufficient paint film adhesion, and fast light curing speed and other problems, to achieve the effect of short curing time, reduced internal stress residual, and good mechanical properties

Active Publication Date: 2014-02-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of topcoat has the characteristics of high hardness and wear resistance, but because the photoinitiator content of this kind of topcoat is high, so the photocuring speed is fast, and there will be a large stress residue when the topcoat is cured by ultraviolet light, resulting in Insufficient adhesion of the paint film; more photoinitiators remain in the coating after UV curing of this topcoat, and most of the by-products generated by the reaction of photoinitiators contain chromophoric groups, resulting in yellowing of the paint film , especially for light-colored topcoats such as white pearl and silver gray

Method used

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  • Finish paint composite and preparation method and use method thereof
  • Finish paint composite and preparation method and use method thereof
  • Finish paint composite and preparation method and use method thereof

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preparation example Construction

[0048] The present invention also provides a preparation method of the above-mentioned topcoat composition, comprising:

[0049] a) Add pigments and fillers and the water-based hydroxyacrylic resin with the structure shown in (I) to the additives in turn, stir for the first time, and grind after stirring to obtain the first top coat;

[0050] b) Add water-based polyurethane acrylic resin, cross-linking agent, deionized water and photoinitiator to the first topcoat with the structure shown in (II) or (III) and stir for the second time, filter after stirring, get topcoat;

[0051]

[0052] R in formula (Ⅰ) 0 is a tertiary amino group, R in formula (II) and formula (III) 1 is a tertiary amino group, R 2 is a hydroxyacrylate group, R 3 is a diisocyanate group, R 4 is a polymer diol group, 20≤n≤60. The process of stirring the additives, pigments and water-based hydroxyacrylic resin can be a method well known to those skilled in the art, such as stirring the above-mentioned...

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Abstract

The invention provides a finish paint composite and a preparation method and use method thereof. The finish paint composite provided by the invention comprises: 9-44 wt% of water-borne hydroxylated acrylic resin of which the structure is disclosed in (I), 6-35 wt% of water-borne urethane acrylate resin of which the structure is disclosed in (II) or (III), 5.4-29.4 wt% of cross linking agent, 0.18-1.7 wt% of photoinitiator, 2.64-12.7 wt% of pigment filler, 2.37-8.9 wt% of accessory ingredient and 18-95.8 wt% of deionized water, wherein R0 in formula (I) is tertiary amine group, R1 in formulas (II) and (III) is tertiary amine group, R2 is hydroxyethyl acrylate group, R3 is diisocyanate group, R4 is polymer divalent alcohol group, and n is more than or equal to 20 and less than or equal to 60. The finish paint provided by the invention has high adhesive force, good yellowing resistance and low energy consumption of paint film solidification.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a topcoat composition and a preparation method and application method thereof. Background technique [0002] Automotive body coatings are multilayer systems that typically include electrophoretic deposition of a primer, midcoat, and topcoat. Among them, the topcoat layer is the outermost coating layer of the car, which is the most direct reflection of the decorative effect of the car appearance, and has a protective effect on the middle coat layer and the primer layer. [0003] Since the topcoat plays an important decorative and protective role in the entire coating of the car, the topcoat needs to have more perfect properties than the primer and the middle coat. Hardness and excellent weather resistance, corrosion resistance and water resistance, etc.; in order to make the paint film have better gloss and improve the decorative effect, the top coat also needs to have better leveling pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/16C09D133/14B05D3/02
Inventor 张红明吕金龙李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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