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A kind of water-based composite paint and its composite film coating method

A composite coating, water-based technology, applied in the field of coatings, can solve the problems of stone chip resistance reduction, composite coating film damage, peeling, etc.

Active Publication Date: 2017-04-05
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with 3C2B, 3C1B needs to strictly control the crosslinking reaction time and reaction rate between the intermediate coating and the top coat, so that the interlayer coordination between the intermediate coating and the top coat is better; in order to ensure the smoothness of the coating film, the intermediate coating The thickness of the coating film must be thinner than that of the intermediate coating film of the 3C2B composite coating film, which may lead to a decrease in stone chipping resistance, or damage to the composite coating film due to collisions between splashed stones and the coating while the vehicle is running. Or peeling occurs at the interface between the electrophoretic coating film and the water-based intermediate coating film

Method used

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  • A kind of water-based composite paint and its composite film coating method
  • A kind of water-based composite paint and its composite film coating method

Examples

Experimental program
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Effect test

manufacture example 1

[0053] Production Example 1, Preparation of Polyester Polyol 1-1 (PE1-1)

[0054] Neopentyl glycol (7.5 parts), 1,6-hexanediol (38.5 parts), 1,6-hexanediol and Acid (54 parts) was added, and the temperature was raised to 120° C. After the raw materials were dissolved, the temperature was raised to 160° C. with continuous stirring. After keeping at 160°C for 1 hour, the temperature was raised to 230°C for 5 hours. Test the acid value at regular intervals at 230°C until the acid value of the resin reaches 1mgKOH / g. Then cool to below 80°C to obtain polyester polyol 1-1 (PE1-1) with an acid value of 1 mgKOH / g, a hydroxyl value of 36 mgKOH / g and a number average molecular weight of 3000.

manufacture example 2

[0055] Production Example 2, Preparation of Polyester Polyol 1-2 (PE1-2)

[0056] Neopentyl glycol (13 parts), 1,6-hexanediol (33.5 parts), 1,6-hexanedioic acid (53.5 parts) were put in, using the method of Production Example 1, the acid value was 1 mgKOH / g, and the hydroxyl value was 55mgKOH / g, polyester polyol 1-2 (PE1-2) with a number average molecular weight of 2000.

manufacture example 3

[0057] Production Example 3, Preparation of Polyester Polyol 2 (PE2)

[0058] Neopentyl glycol (5.8 parts), 1,6-hexanediol (29.9 parts), trimethylolpropane (13.2 parts), 1,6-adipic acid (51.1 parts) were put in, using the method of Production Example 1 , Obtain the polyester polyol 2 (PE2) of acid value 1mgKOH / g, hydroxyl value 136mgKOH / g, number average molecular weight 1500.

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Abstract

The invention discloses an aqueous compound paint. The aqueous compound paint comprises the aqueous middle-coating paint and the aqueous top-coating paint, wherein the aqueous middle-coating paint and the aqueous top-coating paint both comprise at least one aqueous polyurethane. The middle coating and the top coating in the aqueous compound paint are excellent in interlayer coordination and the coating obtained by the invention is excellent in smoothness, water resistance and stone-hit resistance. The invention also discloses a composite coating method of the aqueous compound paint. The composite coating method is capable of obtaining a compound coating which is excellent in smoothness, water resistance and stone-hit resistance.

Description

technical field [0001] The invention relates to the technical field of coatings. More specifically, it relates to a water-based composite coating and a composite coating method thereof. Background technique [0002] The three-coat-one-bake (3C1B) process refers to the automobile painting process. On the car body coated with electrophoretic coating film, the three coats of intermediate coat, top coat and varnish are all wet-on-wet in the same spray booth. Pack. [0003] Compared with the traditional automobile painting process 3C2B, 3C1B only has one less baking process (intermediate coating baking) on ​​the surface, but whether it is in the control of coating film thickness, control of coating appearance, and coating process All have higher requirements. Compared with 3C2B, 3C1B needs to strictly control the crosslinking reaction time and reaction rate between the intermediate coating and the top coat, so that the interlayer coordination between the intermediate coating a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06
CPCC08L2205/025C09D175/06C08L75/06
Inventor 方黎明北村直孝高增奎朱敏德徐峥枡田一明朱仁昌
Owner NIPPON PAINT CHINA
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