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Environmentally-friendly water-based two-component polyurethane coating and preparation method thereof

A water-based two-component, polyurethane coating technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of small molecular weight of hydroxyl components, easy bubbles in the paint film, long drying time, etc., and achieve good compatibility. , Guaranteed quality, simple preparation method

Inactive Publication Date: 2018-06-15
西安经建油漆有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the enhancement of people's awareness of environmental protection and energy, especially the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, the development of low-pollution coatings represented by water-based coatings has been promoted. Water-based polyurethane coatings have high hardness. , good adhesion, abrasion resistance, good solvent resistance, excellent weather resistance and other advantages combined with the low VOC content of water-based polyurethane coatings, and polyurethane polymers have building material properties, using molecular design principles, combined with new synthesis and cross-linking The combined technology can effectively control the composition and structure of the coating polymer, so that the performance of the water-based polyurethane coating film is equivalent to or even better than that of the traditional solvent-based coatings, and it has become one of the fastest-growing coating varieties. Among them, the water-based acrylic polyurethane has a film-forming temperature. Low, strong adhesion, good wear resistance, high hardness, chemical resistance, weather resistance and other superior properties are widely used; however, the molecular weight of the hydroxyl component in waterborne acrylic polyurethane coatings is small and the drying time is long; -NCO and h 2 O reaction produces CO 2 Causes the paint film to be prone to bubbles

Method used

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  • Environmentally-friendly water-based two-component polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An environment-friendly water-based two-component polyurethane coating is composed of component A and component B, and the mass ratio of component A and component B is (2.7-3.0): (0.9-1.0).

[0026] The A component includes 35% to 40% of hydroxyacrylic acid dispersion I, 20% to 24% of hydroxyacrylic acid dispersion II, 0.2% to 1.0% of defoamer, and 2.0% to 3.0% of dipropylene glycol butyl ether in weight percentage , Ethylene glycol butyl ether 2.0% ~ 3.0%, leveling agent 0.2% ~ 1.0%, color paste 15% ~ 38%, thickener 0.1% ~ 0.3%;

[0027] The B component includes 30%-33% of propylene glycol diacetate, 43%-49% of polyurethane curing agent I and 18%-24% of polyurethane curing agent II by weight percentage.

[0028] The present invention uses water-based hydroxyacrylic resin as the base material, and adds pigments with excellent weather resistance, additives (defoamers, leveling agents, thickeners) and cosolvents (dipropylene glycol butyl ether, ethylene glycol butyl ether...

Embodiment 2

[0030] On the basis of Example 1, the hydroxyl content in the hydroxyacrylic acid dispersion I is 3.0-3.8wt%, and the non-volatile content is 45-50wt%; for example, the A2470 hydroxyacrylic acid dispersion produced by Covestro Technology Co., Ltd. , 2033 hydroxyacrylic acid dispersion produced by Wanhua Chemical Group Co., Ltd.; the hydroxyl content in the hydroxyacrylic acid dispersion II is 3.8-4.1wt%, and the non-volatile content is 45-50wt%. The A2646 hydroxyacrylic acid dispersion produced by the company and the 5286 hydroxyacrylic acid dispersion produced by Shanghai Huarong Chemical Co., Ltd.

[0031] The hydroxyacrylic dispersion I can provide excellent gloss, chemical resistance and weather resistance; the hydroxyacrylic dispersion II can provide excellent gloss and mechanical properties, while having outstanding water resistance.

[0032] The defoamer is a polysiloxane hydrophobic particle defoamer with a non-volatile content>98wt%, such as BYK-022 (industrial grade ...

Embodiment 3

[0039] On the basis of above-mentioned embodiment, the preparation method of described environment-friendly type waterborne two-component polyurethane coating comprises the following steps:

[0040] 1) Preparation of component A:

[0041] Firstly, according to the requirements of the operation instructions and internal control indicators, check and accept WPU color pastes of various colors. The acceptance items include: quantity, color, fineness, viscosity, solid content, etc., and then add the formulated amount of hydroxyacrylic dispersion Ⅰ and hydroxyacrylic dispersion Ⅱ Put into a clean tank, add the formula amount of color paste under stirring conditions, after stirring evenly, then add the formula amount of defoamer, dipropylene glycol butyl ether (DPNB), ethylene glycol butyl ether (EB) and leveling agent, stir for 10-20 minutes, and finally add the thickener of the formulated amount to adjust the viscosity, and stir evenly to obtain component A in the environmentally f...

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Abstract

The invention discloses an environmentally-friendly water-based two-component polyurethane coating and a preparation method thereof. The polyurethane coating is composed of an A component and a B component according to the mass ratio of (2.7-3.0):(0.9-1.0); the A component includes the following materials in percentages by weight: 35-40% of hydroxy acrylate dispersion I, 20%-24% of hydroxy acrylicdispersion II, 0.2%-1.0% of a defoaming agent, 2.0%-3.0% of dipropylene glycol butyl ether, 2.0%-3.0% of ethylene glycol butyl ether, 0.2%-1.0% of a levelling agent, 15%-38% of color paste, and 0.1%-0.3% of a thickener; and the B component includes the following materials in percentages by weight: 30%-33% of propylene glycol diacetate, 43%-49% of polyurethane curing agent I, and 18%-24% of polyurethane curing agent II. The water-based two-component polyurethane coating obtained by the method provided by the invention has better physical and mechanical properties such as hardness, abrasion resistance and flexibility, and performance of water resistance, salt spray resistance, heat and humidity resistance and aging resistance.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly coatings, and in particular relates to an environment-friendly water-based two-component polyurethane coating and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection and energy, especially the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, the development of low-pollution coatings represented by water-based coatings has been promoted. Water-based polyurethane coatings have high hardness. , good adhesion, abrasion resistance, good solvent resistance, excellent weather resistance and other advantages combined with the low VOC content of water-based polyurethane coatings, and polyurethane polymers have building material properties, using molecular design principles, combined with new synthesis and cross-linkin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/63
CPCC08K2201/014C08L2205/035C09D175/04C08L83/04C08K5/06
Inventor 王凤竹
Owner 西安经建油漆有限责任公司
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