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Double-component polyurethane water-based paint

A two-component polyurethane and water-based coating technology, applied in the field of polyurethane, can solve the problems of reducing coating performance, reducing matting effect, uneven dispersion of matting powder, etc., to increase roughness and unevenness, and overcome uneven storage stability Good, the effect of reducing the gloss of the coating film

Inactive Publication Date: 2011-06-29
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion stability of the former matting powder is not good, so that the matting powder and the resin will be delaminated and agglomerated during the storage process of the matte paint, which will reduce the matting effect and reduce the storage stability of the matte paint. The latter will increase the construction process. The complexity of the coating, and the uneven dispersion of the matting powder reduces the performance of the coating, especially the hardness and chemical resistance of the coating film.

Method used

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  • Double-component polyurethane water-based paint
  • Double-component polyurethane water-based paint
  • Double-component polyurethane water-based paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) Two-component polyurethane water-based coating

[0028] (1) Formula

[0029] (I) Component A

[0030] Polymer aqueous dispersion: 40g polyacrylate aqueous dispersion Bayhydrol XP2651;

[0031] Polymer emulsion: 20g polyacrylate emulsion AC-261, 40g polyacrylate emulsion (Bayhydrol XP2546);

[0032] Water: 15g

[0033] (II) Component B

[0034] Isocyanate curing agent: 10g of XP2655 from Bayer Corporation of Germany, 5g of N3390 from Bayer Corporation of Germany.

[0035] The molar ratio of polymer OH group in component A to isocyanate curing agent NCO group in component B is 1:1.6.

[0036] (b) Preparation of two-component polyurethane water-based coating

[0037] Disperse the aqueous polymer dispersion and polymer emulsion at 800 RPM for 15 minutes to obtain component A; mix XP2655 and N3390 uniformly to obtain component B. Stir and mix component A and component B evenly, and cure at room temperature for 7 days.

[0038] (c) prepare two-component polyuretha...

Embodiment 2

[0043] (a) Two-component polyurethane water-based coating

[0044] (1) Formula

[0045] (I) Component A

[0046] Polymer aqueous dispersion: 15g polyacrylate aqueous dispersion Bayhydrol XP2651;

[0047] Polymer emulsion: 90g polyacrylate emulsion AC-261;

[0048] Water: 25g

[0049] (I) Component B

[0050] Isocyanate curing agent: 5g hexamethylene diisocyanate trimer, 5g hexamethylene diisocyanate biuret, 5g trimer of isophorone diisocyanate.

[0051] The molar ratio of polymer OH group in component A to isocyanate curing agent NCO group in component B is 1:1.3.

[0052] (b) Preparation of two-component polyurethane water-based coating

[0053] Disperse the aqueous polymer dispersion and polymer emulsion at 800RPM for 15 minutes to obtain Component A; mix the trimer of hexamethylene diisocyanate, hexamethylene diisocyanate biuret and isophorone diisocyanate evenly to obtain Component B. Stir and mix component A and component B evenly, and cure at room temperature for 7...

Embodiment 3

[0059] (a) Two-component polyurethane water-based coating

[0060] (1) Formula

[0061] (I) Component A

[0062] Polymer aqueous dispersion: 70g Bayer's polyacrylate aqueous dispersion Bayhydrol XP2651, 10g Bayer's polyurethane aqueous dispersion VPLS 2303;

[0063] Polymer emulsion: 8g polyacrylate emulsion AC-261, 2g alkyd resin emulsion YF155 from Guangzhou Yifu Chemical Co., Ltd.;

[0064] Matting powder: 0.5g OK607 from Degussa Company;

[0065] Film-forming aids: 2.5g dipropylene glycol methyl ether, 1.0g propylene glycol butyl ether;

[0066] Wetting agent: 0.5g TEGO-245;

[0067] Defoamer: 0.2g TEGO-805, 0.3g TEGO-815;

[0068] Thickener: 0.2g SN-612;

[0069] Water: 4.8g

[0070] (I) Component B

[0071] Isocyanate curing agent: 15g XP2655 of German Bayer Company, 5g of N3390 of German Bayer Company.

[0072] The molar ratio of polymer OH group in component A to isocyanate curing agent NCO group in component B is 1:2.2.

[0073] (b) Preparation of two-comp...

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Abstract

The invention provides a double-component polyurethane water-based paint, belonging to the field of organic polymer compounds. The double-component polyurethane water-based paint comprises isocyanate curing agents component A and component B, wherein the molar ratio of OH groups of a polymer in the component A to NCO groups in the component B is 1: (1-2.2); and the component A contains polymer aqueous dispersion and polymer emulsion, wherein the content of OH in the polymer aqueous dispersion is 2.0-5.0% and the grain size of latex in the polymer aqueous dispersion is 10-100nm, the weight of the polymer emulsion is 0.05-16 times that of the polymer aqueous dispersion, the content of OH in the polymer emulsion is 0-2.0%, and the grain size of the latex in the polymer emulsion is 80-500nm. In the invention, the polymer aqueous dispersion which has small average grain size and contains -OH and the polymer emulsion which has large average grain size are compounded, wherein the latex with a large grain size can increase the roughness and unevenness of a film and reduce the gloss of the film, and the emulsion with small particles promotes the latex with the large grain size to aggregate, reduces the lowest film-forming temperature of the film, improves the film-forming capability of the film and decreases the usage amount of a film-forming additive; and the hardness, chemical-resistance and wear-resistance of the film are improved by using two different water-based polymers are used for compounding.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and relates to polymer compounds obtained only with isocyanate or isothiocyanate, in particular to polyurethane. Background technique [0002] With the enhancement of environmental protection awareness and the improvement of environmental regulations, water-based coatings have attracted more and more attention. Among them, water-based two-component coatings have the advantages of high performance and multi-function, which is the development direction of water-based coatings. People's pursuit of high-quality life has led to an increasing demand for water-based matte coatings, and the development of high-performance water-based two-component matte coatings has become a research hotspot. [0003] Matte paint is to add a certain amount of matting agent to the paint. During the film-forming process of the paint, the matting agent is entrained to the surface of the coating film due to the volat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D175/06
Inventor 瞿金清孔霞朱延安陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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