Method for coating plastic products

A technology of plastic products and coating methods, which is applied in the direction of surface coating liquid devices, coatings, and pre-treated surfaces, etc., which can solve the problems of poor adhesion of coatings, low surface polarity, and poor wettability, and achieve no The effects of loss of light, mild conditions, and simple construction techniques

Inactive Publication Date: 2011-05-11
张栋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for materials with high crystallinity, such as PP, PE, PTFE, etc., the surface of the material has low polarity and poor wettability, and the coating hardly produces micro-swelling on the surface, and the adhesion of the coating is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A coating method for plastic products, comprising the steps of:

[0015] (1) Spray wash with 1% polyoxyethylene ether aqueous solution at 30°C for 3 minutes, then spray with tap water for 2 minutes, and then dry at 60°C for 20 minutes;

[0016] (2) Use an electrostatic precipitator to generate ionized compressed air on the plastic product treated in step (1) to dedust the product surface, then spray an acrylic primer as a primer, and divide it into two sprays. After the first spray, flash dry for 60 seconds. Then spray the second coat, the thickness of the coating film is 20μm;

[0017] (3) Bake the plastic product sprayed with primer at 60°C for 20 minutes, and after the primer is dried, polish the surface of the primer with water sandpaper;

[0018] (4) Spray plain paint on the surface of the polished plastic product with a film thickness of 25 μm. After the plain paint dries, spray polyurethane varnish with a film thickness of 10 μm; Lower the baking time for 20 mi...

Embodiment 2

[0020] (1) Spray wash with polyoxyethylene ether aqueous solution for 5 minutes at 40°C, then spray with tap water for 2 minutes, and then dry at 60°C for 30 minutes;

[0021] (2) Use an electrostatic precipitator to generate ionized compressed air on the plastic product treated in step (1) to dedust the product surface, then spray an acrylic primer as a primer, and divide it into two sprays. After the first spray, flash dry for 60 seconds. Then spray the second coat, the thickness of the coating film is 25μm;

[0022] (3) Bake the plastic product sprayed with the primer at 60°C for 30 minutes. After the primer is dried, polish the surface of the primer with water sandpaper;

[0023] (4) Spray plain paint on the surface of the polished plastic product with a film thickness of 25 μm. After the plain paint dries, spray polyurethane varnish with a film thickness of 15 μm; Lower the baking time for 20 minutes.

Embodiment 3

[0025] (1) Spray wash with polyoxyethylene ether aqueous solution for 4 minutes at 35°C, then spray wash with tap water for 3 minutes, and then dry at 80°C for 25 minutes;

[0026] (2) Use an electrostatic precipitator to generate ionized compressed air on the plastic product treated in step (1) to dedust the product surface, then spray an acrylic primer as a primer, and divide it into two sprays. After the first spray, flash dry for 60 seconds. Then spray the second coat, the thickness of the coating film is 20μm;

[0027] (3) Bake the plastic product after spraying the primer at 65°C for 25 minutes. After the primer is dried, polish the surface of the primer with water sandpaper;

[0028] (4) Spray plain paint on the surface of the polished plastic product with a film thickness of 30 μm. After the plain paint dries, spray polyurethane varnish with a film thickness of 12 μm; Lower the baking time for 25 minutes.

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PUM

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Abstract

The invention discloses a method for coating plastic products, comprising the following steps of treating a surface by a nonionic surfactant, drying the surface, spraying adhesive primer, spraying plain colored paint and polyurethane varnish and the like. The nonionic surfactant is sprayed and washed, therefore, the quality of a coating is more stable and reliable, no pinholes and dulling situation exist, and uniform luster is provided on the surface; in addition, the coating construction process is simple with mild conditions.

Description

technical field [0001] The invention relates to a coating method, in particular to a coating method for plastic products. Background technique [0002] The coating of plastic parts is to remove the release agent, foreign matter, dirt, etc. on the surface of plastic parts by chemical or mechanical methods, remove the resistance of the surface boundary film, improve the adhesion, and coat the surface with paint, which is dried to form a film and adhere to the plastic parts Surface, play the role of protection and decoration. [0003] The coating process of plastic parts can generally be divided into two parts: (1) front (2) primer and topcoat. At present, the mainstream pretreatment process still adopts chemical methods, which are washed with low-temperature degreasing water, activated on the surface, and then dried. Chemicals generally include cleaning agents and surfactants for plastic parts, and the workpiece is conveyed by ordinary catenary or continuous sled. The produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/02B05D3/12B05D3/14B05D3/02
Inventor 张栋
Owner 张栋
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