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A kind of paint composition and its preparation method, the surface decoration method of plastic part and composite workpiece

A technology of composition and paint, which is applied in the direction of surface coating liquid device, pretreatment surface, coating, etc., can solve the problem of unclear boundary between decorative surface and non-decorative surface, and achieve clear boundary, high wear resistance and The effect of corrosion resistance

Active Publication Date: 2016-09-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the technical problem that the boundary between the decorative surface and the non-decorative surface is not clear when the paint used in the prior art is applied to the surface decoration of the integrated seamless injection molding product

Method used

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  • A kind of paint composition and its preparation method, the surface decoration method of plastic part and composite workpiece
  • A kind of paint composition and its preparation method, the surface decoration method of plastic part and composite workpiece

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Experimental program
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Embodiment approach

[0031] In the present invention, the polyisocyanate is a curing agent in the paint composition, which is used for curing and cross-linking with the film-forming components (hydroxyacrylic resin and polyester polyol resin), thereby forming the main body of the paint layer. Unless otherwise specified, in the present invention, the polyisocyanate is an organic compound containing more than two isocyanate groups. Based on the total mass of the paint composition, the content of the polyisocyanate is 5-30wt%, preferably 10-25wt%. As a preferred embodiment of the present invention, the polyisocyanate is hexamethylene diisocyanate trimer (HDI), which can directly use commercially available products, such as Bayer N3390 or Asahi Kasei TPA-90SB.

[0032] The present invention also provides a preparation method of the paint composition, comprising the following steps: first dispersing the hydroxyacrylic resin, polyester polyol resin and auxiliary agents in part of the organic solvent to ...

Embodiment 1-3

[0044] The raw materials were weighed according to the formula in Table 1, and then the paint composition samples S1-S3 were prepared according to the following steps.

[0045] Table 1

[0046]

[0047] Note: The hydroxyl content of hydroxyacrylate resin Hypomer FS-4365A is 2.87wt%, the hydroxyl content of ACR7557 is 6.07wt%, the hydroxyl content of Hypomer FS-2061 is 1.24wt%; the hydroxyl content of polyester polyol resin Bayer 651MPA is 5.5wt%, the hydroxyl content of POL-3538 is 11.54wt%, the hydroxyl content of Bayer 1300PR is 3.1wt%, and the isocyanate group content of polyisocyanate Bayer N3390 is 19.6wt%.

[0048] (1) Disperse hydroxyacrylic resin, polyester polyol resin and additives in 70wt% organic solvent, and stir for 30min at a speed of 700r / min under a high-speed disperser; stop stirring, let it stand for defoaming, and obtain the first system;

[0049] (2) Continue to add the remaining 30wt% organic solvent to the first system, and stir for 15 minutes at a ...

Embodiment 4-6

[0052] The paint composition S1-S3 is directly sprayed on the plastic part with a spray gun, the distance between the spray gun and the plastic part is 0.20m, the compressed air pressure is 0.6MPa during spraying, the flow rate of the paint composition is 1.1ml / s, and the atomized spray width is 23°, the thickness of the sprayed film is 20 microns; after the spraying is completed, leave it at room temperature for 2 minutes, and then bake it at 80°C for 20 minutes to obtain plastic parts A10-A30 with a decorative layer on the surface.

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Abstract

The invention provides a paint composition. The paint composition contains 13-35wt% of a hydroxy acrylic resin, 7-35wt% of a polyester polyol resin, 20-55wt% of an organic solvent, 0.1-1wt% of an assistant, and 5-35wt% of polyisocyanate, wherein the content of a hydroxy group in the hydroxy acrylic resin is 1-10wt%, the content of a hydroxy group in the polyester polyol resin is 3-15wt%, and the content of an isocyanate group in the polyisocyanate is 5-32.5wt%. The paint composition has high surface energy, a paint film formed after spraying a plastic surface with the paint composition has a good adhesion to a plastic substrate, and a boundary between a decorative surface and a non-decorative surface is clear after the surface of a metal-plastic composite workpiece or a glass-plastic composite workpiece is sprayed with the paint composition.

Description

technical field [0001] The invention belongs to the field of workpiece surface decoration, and in particular relates to a paint composition and a preparation method thereof, a surface decoration method of a plastic part and a surface decoration method of a composite workpiece. Background technique [0002] In the composite workpiece prepared by the integrated seamless technology, the non-decorative surface is generally protected by a film fixture and a protective film, and the decorative surface is treated with paint. At present, after the paint on the surface of the integrated seamless injection molding product is sprayed, the boundary between the decorative surface and the non-decorative surface is unclear, such as sawtooth, multiple sprays, steps and other poor appearance phenomena, which makes its application field more popular. big limit. Therefore, it has become an urgent task to develop a kind of novel paint suitable for surface decoration of integrated seamless inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/06C09D7/12B05D7/24B05D3/00
Inventor 崔静娜赖秀林韦思伟
Owner BYD CO LTD