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Water-based two-component polyurethane coating and preparation method thereof

A polyurethane coating, water-based two-component technology, applied in the field of coatings, can solve the problem of low reaction speed, achieve the effect of improving hydroxyl activity, mechanical properties and chemical resistance, and fast drying speed

Inactive Publication Date: 2020-11-17
DONGLAI COATING TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carboxyl group of the polyol reacts with the NCO group to form an amide, but the reaction speed is small; after the amine neutralizer leaves the coating film, the carboxyl group may react with the hydroxyl group, which greatly eliminates the hydrophilicity of the coating system and improves the water resistance of the coating film sex

Method used

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  • Water-based two-component polyurethane coating and preparation method thereof
  • Water-based two-component polyurethane coating and preparation method thereof
  • Water-based two-component polyurethane coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0060] A water-based two-component paint, comprising a main agent and a hardener, the main agent is composed of the following components in parts by weight:

[0061]

[0062]

[0063] Hardener consists of the following components in parts by weight:

[0064] 80 parts of water-based isocyanate;

[0065] Propylene glycol diacetate 20 parts.

Embodiment 2

[0067] A water-based two-component paint, comprising a main agent, a hardener and a catalyst, the main agent is composed of the following components in parts by weight:

[0068]

[0069] Described hardening agent is made up of the following composition that accounts for weight part:

[0070] 80 parts of water-based isocyanate;

[0071] Propylene glycol diacetate 20 parts.

[0072] The waterborne two-component polyurethane coating of above-mentioned 2 embodiments is obtained by following preparation method:

[0073] The main ingredient preparation method comprises the following steps:

[0074] 1) Grinding color paste

[0075] a. Prepare the raw materials according to the above ratio;

[0076] b. Add 80% deionized water in the formula amount into the dispersion container, slowly add the dispersant in the formula amount under stirring, stir and disperse to a uniform state;

[0077] c. Under stirring, slowly add the formula amount of titanium dioxide, precipitate barium su...

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Abstract

The invention relates to a waterborne two-component polyurethane coating. The waterborne two-component polyurethane coating comprises a main agent and a hardening agent. The main agent comprises the following components in parts by weight: 15-20 parts of deionized water, 1-2 parts of dispersing agent, 15-21 parts of titanium dioxide, 4-6 parts of precipitated barium sulfate, 50-60 parts of waterborne hydroxy acrylic acid secondary dispersion, 4-6 parts of a cosolvent, 0.1-0.2 part of a pH regulator, 0.3-0.5 part of substrate wetting agent, 0.1-0.2 part of a defoaming agent, 0.3-0.5 part of a leveling agent, 0.5-1 part of a thickener and 0.1-0.3 part of a catalyst. The hardening agent comprises the following components in parts by weight: 70 to 80 parts of water-based isocyanate and 20 to 30 parts of propylene glycol diacetate. In addition, autonomously modified high-activity organic metal salt is selected as a catalyst and is added into the main agent. On the premise of not influencingcomprehensive performance, the invention provides a feasible scheme for improving the mechanical performance and chemical resistance of the coating and improving the hard drying speed of the water-based 2K-PU under the condition of room-temperature drying.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a water-based two-component polyurethane coating and a preparation method thereof. Background technique [0002] The film-forming process of water-based two-component polyurethane coatings is different from solvent-based systems. The initial film-forming process is a physical drying process. With the evaporation of water, the dispersion or emulsion particles coagulate, and the polymer chains diffuse and react with each other. For polymers with high glass transition temperature and large molecular weight, in order to obtain a good coating film, the particle surface must be modified to make the emulsion have high solid content and low viscosity, and increasing the air-water interfacial tension is conducive to improving the coating film formation conditions of. The chemical drying process is relatively complicated, involving the reaction between the NCO group of the curing agent and the hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/61
CPCC09D175/04C09D7/61C08K2003/2241C08K2003/3045C08K3/22C08K3/30
Inventor 朱忠敏兰聪叶小明
Owner DONGLAI COATING TECH SHANGHAI
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