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Dual-component waterborne polyurethane intermediate coating composition with anti-sagging characteristics and a preparation method thereof

A water-based polyurethane, two-component technology, applied in the field of coatings, can solve problems such as reducing the water resistance and sagging of coatings

Active Publication Date: 2019-04-02
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing two-component waterborne polyurethane intermediate coating system, there is a big problem that it is easy to sag during the construction of the intermediate coating, especially in the process of facade construction
In order to improve the sagging of the paint, polyurethane thickeners are usually used to increase the thixotropy of the paint, which will greatly reduce the sag during the construction of the paint, but for intermediate coatings that require a higher wet film thickness , there will still be serious sagging
On the other hand, the use of polyurethane thickeners will reduce the water resistance of the coating. Therefore, to prepare a two-component waterborne polyurethane intermediate coating composition with excellent anti-sagging properties without affecting other properties of the coating , is a problem that the automotive coatings industry needs to solve

Method used

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  • Dual-component waterborne polyurethane intermediate coating composition with anti-sagging characteristics and a preparation method thereof
  • Dual-component waterborne polyurethane intermediate coating composition with anti-sagging characteristics and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The two-component water-based polyurethane intermediate coating composition with anti-sagging properties of this embodiment is prepared by mixing component A, component B, and deionized water in a mass ratio of 100:7.94:8, wherein the first component Components were prepared from the following qualities of raw material: 32 grams of hydroxyl functionalized waterborne acrylic resin, 3 grams of butyl glycol acetate, 2 grams of diethylene glycol butyl acetate, 0.4 grams of dispersant Dispers 745W, 0.2g leveling agent BYK-348, 0.1g defoamer Foamex 810, 0.3 grams of pH regulator N,N-dimethylethanolamine, 8 grams of titanium dioxide R 902+, 1 gram of pu carbon black, 33 grams of precipitated barium sulfate, 9 grams of water-based anti-sag polymerization containing polyurea groups and 11 grams of deionized water; component B consists of 80 grams Prepared by mixing XP 2655 and 20 grams of propylene glycol methyl ether acetate.

[0060] The preparation method of the two-comp...

Embodiment 2

[0073] The two-component water-based polyurethane intermediate coating composition with anti-sagging properties of the present embodiment is prepared by mixing component A, component B, and deionized water according to a mass ratio of 100:5.25:5; wherein, the first component Components were prepared from raw materials of the following qualities: 28 g hydroxy-functionalized water-based acrylic resin, 1.5 g butyl glycol acetate, 0.5 g diethylene glycol butyl ether acetate, 1.2 g dispersant EDAPLAN 490, 0.35 g flow Leveling agent BYK-348, 0.3 grams of defoamer BYK-025, 0.1 grams of pH regulator N,N-dimethylethanolamine, 15 grams of titanium dioxide R 902+, 2 grams of pu carbon black, 35 grams of precipitated barium sulfate, 5 Gram talc, 4.5 gram water-based anti-sagging polymers containing polyurea groups and 6.55 gram deionized water; the second component consists of 90 grams 161 and 10 grams of propylene glycol methyl ether acetate mixed in the system.

[0074] The preparatio...

Embodiment 3

[0087] The two-component water-based polyurethane intermediate coating composition with anti-sagging properties of the present embodiment is prepared by mixing component A, component B, and deionized water according to the mass ratio of 100:16.49:12.5; wherein, the first Components were prepared from raw materials of the following qualities: 45 grams of hydroxyl-functionalized waterborne acrylic resin, 5 grams of butyl glycol ether acetate, 3 grams of propylene glycol monomethyl ether acetate, 1 gram of diethylene glycol butyl ether acetate, 0.1 grams Dispersant Dispers 745W, 0.1g dispersant EDAPLAN 490, 0.35g leveling agent BYK-348, 0.2g defoamer Foamex 810, 0.45 grams of pH regulator 2-amino-2-methyl-1-propanol, 6 grams of titanium dioxide R 902+, 0.3 grams of phthalocyanine blue 8631, 12 grams of precipitated barium sulfate, 2 grams of talc, 12.5 grams Water-based anti-sag polymer containing polyurea groups and 12 grams of deionized water; the second component is made fr...

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Abstract

The invention relates to the technical field of coating, in particular to a dual-component waterborne polyurethane intermediate coating composition with anti-sagging characteristics and a preparationmethod thereof. The composition is mainly prepared from an A component and a B component. The A component is prepared from, by mass, 28-45% of hydroxyl functionalized waterborne acrylic resin, 2-9% ofa cosolvent A, 0.2-1.2% of a dispersant, 0.2-0.35% of a leveling agent, 0.1-0.3% of a defoamer, 0.1-0.45% of a pH regulator, 6-17% of pigment, 14-40% of a filler, 4.5-12.5% of a waterborne anti-sagging polymer containing a polyurea group and 6.55-12% of deionized water. The composition has excellent sagging resistance, adhesive force, waterproofness and resistance to stone crash.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a two-component waterborne polyurethane intermediate coating composition with anti-sagging properties and a preparation method thereof. Background technique [0002] In 2015, the Ministry of Industry and Information Technology issued the "Passenger Car Manufacturing Enterprises and Product Access Management Rules". Waterborne automotive coatings. As environmental regulations become more and more stringent, the water-based coating of passenger car coatings has become an industry trend. [0003] As a transition coating between the electrophoretic primer and the base coat, the automotive mid-coat can improve the smoothness of the coating, thereby improving the vividness, fullness and gloss of the top coat, and significantly improving the coating's resistance to corrosion. Stone performance. According to different systems, water-based intermediate coatings are divided into baking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D175/02C09D5/08
CPCC09D5/08C09D175/04C08L75/02
Inventor 许飞王艳艳刘汉功张汉青庄振宇祝宝英刘明刘睿胡中周丽左慧明朱正宝朱柯丁帮勇
Owner CHINA NAT OFFSHORE OIL CORP
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