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Automobile body composite coating layer and coating method thereof

A composite coating and automobile body technology, applied in coatings, devices for coating liquid on the surface, electrolytic coatings, etc., can solve problems such as single color, and achieve the effects of reducing equipment investment, saving processes, and reducing surface adjustment processes

Inactive Publication Date: 2017-09-26
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the paper "Discussion on the Painting Process of Automotive Water-based Single-coat Solid Color Paint", only the coating process of white water-based single-coat solid color paint was studied, and the color was single

Method used

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  • Automobile body composite coating layer and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of the water-based Yunnan white plain finish paint for commercial vehicle cabs is: 18.6% titanium dioxide pigment; 14.9% acrylic emulsion; 5.1% methylated amino resin; 10% melamine resin; 1.2% defoamer ( polyether siloxane copolymer); 2.0% viscosity modifier (fumed carbon black); 1.0% surface modifier (polydimethylsiloxane); 0.5% UV absorber (phenylene acrylic acid); 1.0% PH Conditioner (dimethylethanolamine); 2.8% butyl glycol ether, 2.2% diethylene glycol butyl ether, 1.06% isopropanol; 41% deionized water.

[0024] The coating method of the water-based Yunnan white plain topcoat composite coating for commercial vehicle cabs is: cab welding assembly → hot water washing → degreasing → water washing → pure water washing → silane conversion coating 1 (25 °C, soak for 2 minutes, film thickness 0.3 μm)→water washing→pure water washing→electrophoresis 2 (thin-film ultra-high throwing power electrophoretic coating, construction time 150 s, construction voltage ...

Embodiment 2

[0027] The composition of water-based phthalocyanine blue plain paint for commercial vehicle cabs is: 19.1% phthalocyanine blue pigment; 14.5% acrylic emulsion; 5.0% methyl etherified amino resin; 10% melamine resin; 1.2% defoaming agent (polyether siloxane copolymer); 2.0% viscosity modifier (fumed carbon black); 1.0% surface modifier (polydimethylsiloxane); 0.5% UV absorber (phenylene acrylic acid); 1.0 %PH adjuster (dimethylethanolamine); 5.06% ethylene glycol butyl ether and other alcohol ether solvents (2.8% ethylene glycol butyl ether, 2.2% diethylene glycol butyl ether, 1.06% isopropanol); 41% Deionized water.

[0028] The coating method of the water-based phthalocyanine blue plain topcoat composite coating for commercial vehicle cabs is: cab welding assembly → hot water washing → degreasing → water washing → pure water washing → phosphorus-free chemical conversion coating 1 (25 ° C, soak for 2 min , film thickness 0.4 μm)→water washing→pure water washing→electrophores...

Embodiment 3

[0031] The water-based uropine red plain finish paint for the cab of a commercial vehicle consists of: 19.3% diketopyrrolopyrrole pigment; 14.3% acrylic emulsion; 5.0% methylated amino resin; 10% melamine resin; 1.2% ( polyether siloxane copolymer); 2.0% viscosity modifier (fumed carbon black); 1.0% surface modifier (polydimethylsiloxane); 0.5% UV absorber (0.3% phenylacrylic acid, 0.2% hindered amine light stabilizer); 1.0% PH adjuster (dimethylethanolamine); 5.06% ethylene glycol butyl ether and other alcohol ether solvents (2.85% ethylene glycol butyl ether, 2.15% diethylene glycol butyl ether, 1.06% isopropanol); 41% deionized water.

[0032] The coating method of the composite coating of water-based uropine red plain paint for the cab of commercial vehicles is: cab welding assembly → hot water washing → degreasing → water washing → pure water washing → phosphorus-free chemical conversion coating 1 (25 °C, soak for 2 min , film thickness 0.3 μm) → water washing → pure wat...

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Abstract

The invention relates to an automobile body composite coating layer which is characterized in that a first layer of the composite coating layer is a phosphorus-free conversion film, and the film thickness is 0.2-0.5 mu m; a second layer is a thin-film high-throwing power electrophoretic coating layer, and the film thickness is 15-18 mu m; a third layer is a water-based plain-colored paint coating layer, and the film thickness is 35-40 mu m; the total film thickness is 50.2-58.5 mu m; a finish paint of the water-based plain-colored paint coating layer consists of a coloring pigment occupying 18-22 percent of the total percent, emulsified resin occupying 14.5-15.5 percent of the total percent, hydrophilic water-soluble resin occupying 5 percent of the total percent and melamine resin occupying 10 percent of the total percent; on the premise of ensuring the quality of the composite coating layer, an advanced phosphorus-free pre-treatment process and a water-based plain-colored finish paint varnish-free process are adopted, so that the coating process is reduced, and a coating process is shortened; with the adoption of an advanced pre-treatment material, a thin-film high-throwing power electrophoretic coating and the water-based single-coated plain-colored finish paint, the film thickness of the composite coating layer is reduced, so that the production line investment is reduced, the coating consumption is reduced, the VOC discharge quantity is reduced, the comprehensive coating cost is reduced, and green and environment-friendly coating is realized.

Description

technical field [0001] The invention relates to a composite coating for an automobile body and a coating method thereof, belonging to the technical field of automobile coating. Background technique [0002] "Twelfth Five-Year Plan for Air Pollution Prevention and Control in Key Areas" requires: "For new motor vehicle manufacturing and coating projects, water-based coatings and other low-VOC content coatings account for no less than 80% of the total coating usage"; January 26, 2015 The Ministry of Finance and the Taxation Bureau jointly issued the "Notice on Levying Consumption Tax on Batteries and Paints": Paint manufacturers are required to pay a tax of 4% of the paint price for paints with a VOC content exceeding 420g / L. Due to the requirements of environmental protection regulations, the top coat of new car body painting lines must use water-based paint, whether it is plain paint or metallic paint. [0003] At present, the plain paint coatings of automobile bodies are ma...

Claims

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Application Information

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IPC IPC(8): C09D133/00C09D161/32C09D161/28C09D183/04C09D5/44C09D7/12C25D13/12B05D5/06B05D7/24
CPCC09D133/00B05D5/061B05D7/24C08L2205/035C09D5/44C09D183/04C25D13/12C08L61/32C08L61/28C08L83/04C08K13/02C08K3/04C08K5/3475
Inventor 宋华于泽淼李元吉赵冉高成勇张澍庞虹
Owner CHINA FIRST AUTOMOBILE