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Single-component low-temperature crosslinking water-based paint and preparation method thereof

A water-based coating and low-temperature cross-linking technology, applied in the field of coatings, can solve the problems such as failure to achieve and difficult low-temperature curing of one-component water-based coatings, and achieve the effects of low VOC, ensuring construction applicability and good construction applicability.

Pending Publication Date: 2022-05-13
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the low-temperature crosslinking process of one-component automotive coatings has not yet been realized, and the main constraints lie in the stability and curing effect of the low-temperature one-component crosslinking agent.
At the same time, in the existing traditional technology, it is difficult for the one-component water-based coating to be cured at low temperature and at the same time meet the performance requirements of the original automobile coating.

Method used

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  • Single-component low-temperature crosslinking water-based paint and preparation method thereof
  • Single-component low-temperature crosslinking water-based paint and preparation method thereof
  • Single-component low-temperature crosslinking water-based paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0067] The preparation of example 1 coating composition 1 (comparative example 1)

[0068] It should be noted that the coating composition 1 described in this example 1 does not have the one-component cross-linking agent described in the present invention, but uses the traditional high-temperature baking amino resin—Cymel 325 of Cytec Corporation of the United States as the cross-linking agent. Joint agent, so this coating composition 1 is only as comparative example 1.

[0069] This coating composition 1 is prepared by the following method:

[0070] (1) Under stirring, add 15.0g of water-based acrylic resin Joncryl 8312, 17.1g of water-based polyurethane resin Bayhydrol A 2750, 7.0g of water-based acrylic resin Antkote 2042, 1.5g of elastic resin KFlex-188, and a crosslinking agent in the reaction vessel Cymel 325 15g, PH regulator 10% DMEA 0.2g, defoamer Tego 805N 0.2g, defoamer Foamstar ST 2400 0.6g, wetting agent BYK-345 0.1g, and then use a high-speed disperser to dispe...

example 2

[0073] Preparation of Example 2 Coating Composition 2

[0074] Different from the coating composition 1 described in the above example 1, the coating composition 2 in this embodiment has the one-component crosslinking agent (hereinafter referred to as crosslinking agent BIT-50WB) prepared by the following method according to the present invention .

[0075] The above-mentioned cross-linking agent BIT-50WB is prepared by the following method:

[0076] (1) Mix 50 g of isocyanate HDI trimer, 18 g of cyclohexanone, 20 g of xylene, 25 g of butanone, and 0.3 g of DBTDL at 600 rpm for 5 minutes to generate an isocyanate solution;

[0077] (2) Heat the above-mentioned isocyanate solution to 45°C, and gradually add caprolactam as a blocking agent at a speed of 500 to 800 rpm, keeping the ratio of the hydroxyl group of the blocking agent to the NCO group of the isocyanate within the range of 1:1 to 3:1. After 2 hours of dripping, the temperature was slowly raised to 70-75°C after co...

example 3

[0086] The preparation of example 3 coating composition 3 (comparative example 2)

[0087]Different from the coating composition 1 described in the above example 1, the coating composition 3 in this example has the one-component crosslinking agent BIT-50WB described in the present invention. The crosslinker BIT-50WB was prepared by the method described in Example 2.

[0088] However, coating composition 3 in this example does not have the elastic resin described in the present invention. Therefore, this embodiment is only used as Comparative Example 2.

[0089] This coating composition 3 is prepared by the following method:

[0090] (1) Under stirring, add the above-mentioned water-based acrylic resin Joncryl 831215.0g, water-based polyurethane resin Bayhydrol A 2750 18.6g, water-based acrylic resin Antkote 2042 7.0g, cross-linking agent BIT-50WB 15g, pH regulator 10% DMEA 0.2g, defoamer Tego 805N 0.2g, defoamer Foamstar ST2400 0.6g, wetting agent BYK-345 0.1g, and then u...

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Abstract

The invention provides a single-component low-temperature cross-linking water-based coating which is endowed with double characteristics of high elasticity and high cross-linking property through the cross-linking action of the water-based acrylic resin, the water-based polyurethane, the elastic resin and the single-component cross-linking agent, and a single-component low-temperature cross-linking water-based coating system particularly suitable for an original automobile factory is provided. The coating is used for an original automobile factory, and can particularly meet the requirement of low-temperature curing while giving consideration to other properties, and the curing temperature of the original automobile factory coating is reduced from 140 DEG C to 80-100 DEG C. Meanwhile, the invention also provides a preparation method of the single-component low-temperature crosslinking water-based paint.

Description

technical field [0001] The invention relates to the field of coatings. Specifically, the present invention relates to a one-component low-temperature cross-linking water-based coating used in automobile original plants and a preparation method thereof. Background technique [0002] In recent years, with the increasingly strict national and local environmental protection laws and regulations and the improvement of people's environmental protection awareness, energy saving and emission reduction technology has become an important direction of development today. Its development has prompted all walks of life to actively research and develop various new materials to meet the increasingly stringent Laws and regulations and environmental protection requirements. [0003] The automotive industry is showing the same clear trend, with new opportunities and challenges emerging along with the vigorous development of the automotive industry. At the same time, in order to ensure suffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D133/04C09D7/63C09D7/65
CPCC09D175/04C09D7/63C09D7/65C08L2205/035C08L2312/00C08L33/04C08K5/29C08L79/00C08L79/02
Inventor 徐嘉希潘红霞
Owner NIPPON PAINT CHINA
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