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Water-based colored paint suitable for wet spraying process and application thereof

A color paint, water-based technology, applied in the direction of coating, polyester coating, polyurea/polyurethane coating, etc., can solve the problems that it is difficult to achieve the appearance and color effect, and the risk of aggravating the disadvantages of water-based color paint film, to achieve excellent Stability, enhanced color effects, good workability and appearance effects

Active Publication Date: 2020-01-07
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the water-based base paint is not fully dried and contains water, wet-spraying the solvent-based varnish greatly increases the risk of water-based base paint producing film defects, and compared with traditional technologies, it is difficult to achieve the ideal appearance and color effect

Method used

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  • Water-based colored paint suitable for wet spraying process and application thereof
  • Water-based colored paint suitable for wet spraying process and application thereof
  • Water-based colored paint suitable for wet spraying process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0068] (1) Manufacture of polyester polyol

[0069] In the reaction vessel equipped with a reflux cooling device with a reaction water outlet, a thermometer, a stirring device and a nitrogen inlet pipe, put the following raw materials into:

[0070]

[0071] Heat up to 120°C and heat up to 160°C with continuous stirring after the raw materials are dissolved. 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 A with an acid value of 1 mg KOH / g, a hydroxyl value of 129 mg KOH / g, and a number average molecular weight of about 1000.

[0072] (2) Synthesis of polyurethane

[0073] In the reaction vessel equipped with a reflux cooling device with a reaction water outlet, a thermometer, a stirring device and a nitrogen gas introduction pipe, put the following raw materials.

[0074]

[0075]...

manufacture example 1

[0110] The preparation process of water-based paint comprises in manufacturing example 1:

[0111] The first step is to add ALUMINUM PASTE LX-318S and A-903K-SP to the auxiliary cylinder a, then add ethylene glycol phenoxyethanol and phenoxyethanol to dissolve, and stir for 10 minutes; then add ACS-1016, Surfynol- 440, BYK-345, DISPERBYK-182, stirred for 20min to obtain the mixture.

[0112] In the second step, add water-based polyurethane A, NP-6100, and CYMEL 250 to the main tank b in turn, and stir for 30 minutes; then add CYMEL 370N, BYK-011 in turn, and stir for 15 minutes, and adjust the pH value with 10% aqueous solution of dimethylethanolamine Between 7.8-8.5.

[0113] In the third step, add acrylic emulsion B and ADEKANOL UH-814N to the main cylinder b in turn, and stir for 30 minutes; then add ACW-1011 and AR-2000(T)G314 / BF-21PASTE UDP in turn, and stir for 20 minutes.

[0114] The fourth step is to add the mixture in the auxiliary vat a to the main vat b while sti...

manufacture example 2

[0118] Preparation method is the same as manufacture example 1. The difference is that AQUACER 507 wax emulsion is added in the fifth step.

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Abstract

The invention discloses water-based colored paint suitable for a wet spraying process. The water-based colored paint is prepared from the following raw materials in parts by weight: 10-20 parts of water-based polyurethane, 10-20 parts of acrylic emulsion with a core-shell structure, 10-15 parts of water-soluble amino resin, 5-10 parts of water-soluble acrylic acid, 10-20 parts of water-soluble polyester, 0-5 parts of an effect pigment, 5-20 parts of auxiliaries and 0-10 parts of water-based color paste, wherein the number-average molecular weight of the waterborne polyurethane is 1000 to 5000,and the hydroxyl value of the waterborne polyurethane is 100 to 200 mgKOH / g; wherein the glass transition temperature of the acrylic emulsion with the core-shell structure is 30-60 DEG C, and the hydroxyl value is 80-150mg KOH / g. The water-based colored paint has good constructability and appearance in a wet spraying process, common paint film defects such as pinholes, hole explosion, sagging andlayer mixing are effectively avoided, and the color effect of the effect pigment is improved.

Description

technical field [0001] The invention relates to the technical field of coatings. More specifically, it relates to a water-based color paint suitable for wet-spray wet process and its application. Background technique [0002] The output of China's automobile market has ranked first in the world through continuous and rapid growth, which has brought a lot of demand for coatings. At the same time, the increasingly severe environmental pressure has given birth to the research and development and application of water-based automotive coatings. Germany, France, Japan and other countries have begun to use a large number of water-based paints for car original painting. Domestically, since January 1, 2016, the Chinese government has formally implemented the latest revision of the "Air Pollution Prevention and Control Law", which for the first time included volatile organic compounds (VOCs) in the scope of supervision, which put forward stricter requirements for the coatings indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D167/00C09D151/00C09D161/20
CPCC09D175/06C09D167/00C09D151/003C08L2205/035C08L2205/025C08L67/00C08L61/20C08L51/003C08L75/06
Inventor 朱敏德夏天渊印维坚许建华毛方桂王飞
Owner NIPPON PAINT CHINA
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