Water-based two-component polyurethane paint for galvanized plates and preparation method of water-based two-component polyurethane paint

A two-component polyurethane and water-based isocyanate technology, applied in the field of coatings, can solve the problems of poor weather resistance and poor adhesion, and achieve the effects of good adhesion, good water resistance and excellent water resistance.

Active Publication Date: 2020-05-01
GUANGZHOU JOINTAS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of poor adhesion and poor weather resistance of the current galvanized sheet coating, one of the purposes of the present invention is to provide a water-based two-c

Method used

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  • Water-based two-component polyurethane paint for galvanized plates and preparation method of water-based two-component polyurethane paint

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0043] Example 1

[0044] In this example, a water-based two-component polyurethane coating contains component A and component B. The mass ratio of component A and component B is 8:1. The composition of component A and component B are as follows:

[0045] The A component, in parts by mass, includes the following components: 53 parts of aqueous hydroxy acrylic dispersion, 0.8 parts of wetting and dispersing agent, 1 part of antifoaming agent, 0.5 part of pH regulator, 6 parts of cosolvent, 25 parts of pigments and fillers, 1 part of leveling agent, 1 part of thickener, 1.5 parts of adhesion promoter and 10 parts of deionized water;

[0046] The B component is a water-based isocyanate curing agent.

[0047] The raw materials used are described as follows:

[0048] Aqueous hydroxy acrylic dispersion: Antkote 2035 hydroxy acrylic dispersion of Yantai Wanhua Group Co., Ltd.;

[0049] Curing agent: WL72-100 from Japan's Asahi Kasei;

[0050] Wetting and dispersing agent: Tego 750w wetting and ...

Example Embodiment

[0063] Example 2

[0064] In this example, a water-based two-component polyurethane coating contains component A and component B. The mass ratio of component A and component B is 8.2:1. The compositions of component A and component B are as follows:

[0065] The A component, in parts by mass, includes the following components: 58 parts of aqueous hydroxy acrylic dispersion, 0.8 parts of wetting and dispersing agent, 1 part of antifoaming agent, 0.5 part of pH regulator, 5 parts of cosolvent, 25 parts of pigments and fillers, 1 part of leveling agent, 0.8 part of thickener, 1.5 part of adhesion promoter and 6 parts of deionized water.

[0066] The B component is a water-based isocyanate curing agent.

[0067] The raw materials used are described as follows:

[0068] Aqueous hydroxy acrylic dispersion: Antkote 2035 hydroxy acrylic dispersion of Yantai Wanhua Group Co., Ltd.;

[0069] Curing agent: WL72-100 from Japan's Asahi Kasei;

[0070] Wetting and dispersing agent: Tego 750w wetting a...

Example Embodiment

[0083] Example 3

[0084] In this example, a water-based two-component polyurethane coating contains component A and component B. The mass ratio of component A and component B is 7:1. The composition of component A and component B are as follows:

[0085] The A component, in parts by mass, includes the following components: 50 parts of aqueous hydroxy acrylic dispersion, 0.8 parts of wetting and dispersing agent, 1 part of antifoaming agent, 0.5 part of pH regulator, 5 parts of cosolvent, 25 parts of pigments and fillers, 1 part of leveling agent, 1 part of thickener, 1.5 parts of adhesion promoter and 14 parts of deionized water.

[0086] The B component is a water-based isocyanate curing agent.

[0087] The raw materials used are described as follows:

[0088] Aqueous hydroxy acrylic dispersion: Antkote 2035 hydroxy acrylic dispersion of Yantai Wanhua Group Co., Ltd.;

[0089] Curing agent: WL72-100 from Japan's Asahi Kasei;

[0090] Wetting and dispersing agent: Tego 750w wetting and ...

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Abstract

The invention discloses water-based two-component polyurethane paint for galvanized plates and a preparation method of the water-based two-component polyurethane paint. The water-based two-component polyurethane paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (6.4-9.6):1; the component A comprises the following components: a water-based hydroxy acrylic acid dispersion, a wetting dispersant, an antifoaming agent, a pH regulator, a cosolvent, a pigment filler, a leveling agent, a thickener, an adhesion promoter and water; the wetting dispersant is a segmented copolymer aqueous solution containing pigment affinity groups; the adhesion promoter contains an active group capable of reacting with hydroxyl and/or carboxyl in the water-based hydroxyl acrylic acid dispersion; the component B is a water-based isocyanate curing agent. Meanwhile, the invention also discloses a preparation method of the water-based two-component polyurethane paint for the galvanized sheet. The waterborne polyurethane coating disclosed by the invention has the characteristics of being good in adhesive force to galvanized plates, outstanding in yellowing resistance and aging resistance and excellent in water resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based two-component polyurethane paint for galvanized sheets and a preparation method thereof. Background technique [0002] As a plate with good strength and flexibility, galvanized sheet is widely used in prefabricated houses, living boxes and other fields. Since the galvanized sheet itself has a galvanized layer, its anti-corrosion performance is better, but the residential box and the prefabricated house generally need to be sprayed with a layer of paint for the sake of beauty. The coating needs to have good adhesion to the galvanized layer. Excellent weather resistance and certain water resistance. Among them, the adhesion of the coating to the galvanized layer, especially the adhesion of the coating after soaking in water is particularly critical. The lack of adhesion makes the coating easy to fall off, which directly affects the service life of the board room. ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/65C09D7/63C09D7/80C08G18/62
CPCC08G18/6216C08L2205/025C08L2205/035C09D175/04C09D7/63C09D7/65C09D7/80C08L75/04C08L101/00C08K5/5435
Inventor 王建川陈剑华陈卓崔晓帆余飞
Owner GUANGZHOU JOINTAS CHEM
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