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A water-based two-component coating

A two-component coating, water-based technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor adhesion between paint layers, low hardness, unstable industrial production, etc., and achieve good surface drying time Effect

Active Publication Date: 2020-06-02
HUZHOU JIFU NEW MATERIALS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization stability of conventional polyacrylate emulsions with high hydroxyl content is poor, and industrial production is unstable.
At present, the hardness and chemical resistance of waterborne two-component polyurethane paint films are improved by increasing the glass transition temperature and hydroxyl content of hydroxyl polyacrylate emulsions, which will also lead to the need for more organic small molecule film-forming aids in the process of paint formulation. agent and curing agent (the curing agent often contains a certain amount of co-solvent), increasing the content of volatile organic compounds (VOC) in the coating will also lead to an increase in the cost of the coating
Therefore, conventional methods are difficult to improve the poor appearance, poor chemical resistance, and low hardness of hydroxyl polyacrylate emulsion two-component paint films.
[0004] Chinese invention patent application CN103059210 modifies the hydroxyl polyacrylate emulsion by adding 2%-5% fluorine-containing acrylic acid monomer, although the water resistance and chemical resistance of the two-component paint film will be slightly improved, due to the fluorine-containing acrylic acid The hydrophobic and oleophobic properties of the ester monomer make the conversion rate of the polymerization reaction not high, which easily causes a large amount of fluorine-containing monomers to remain, and also causes problems such as poor interlayer adhesion of the paint film, and the fluorine-containing acrylate monomer The high price has caused the cost of polymer emulsion to rise sharply, etc.

Method used

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  • A water-based two-component coating
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Examples

Experimental program
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Effect test

Embodiment approach

[0027] As an embodiment, the alkyl methacrylate may be one or more of methyl methacrylate, ethyl methacrylate, propyl methacrylate and butyl methacrylate.

[0028] When the acrylic resin is formed by copolymerization of various monomers, the acrylic resin with a specific glass transition temperature can be synthesized by adjusting the type of monomer and the percentage in the copolymer. Wherein, the glass transition temperature is the temperature at which the high polymer changes from a highly elastic state to a glass state, reflecting the conditions for the transition between high polymer elasticity and brittleness. Acrylic resin is a typical copolymer, and its glass transition temperature can be calculated by Fox formula:

[0029]

[0030] In the above formula, Wi and Tgi are respectively the mass ratio of each monomer i in the copolymer and the glass transition temperature of its homopolymer. The difference between methacrylate and acrylate monomers is that methacrylate...

Embodiment 1

[0068] Raise the temperature of A component PTMEG1000, B component HDI and C component BDO to 100, 60, and 80°C respectively, add 40ppm DabcoT-9, 0.2%wt Irganox1010, 0.2%wt Irgafos168, 0.4% to A component wt Tinuvin 329, 0.4%wt Tinuvin 292; add DMBA with 1.31 times the mass of BDO to component C, and keep the temperature at 80, 60, 60°C after the above three components are fully melted and uniform;

[0069] After mixing components A, B, and C at a ratio of 57.7%wt, 33.4%wt, and 8.9%wt, add part of HDI so that the molar ratio of NCO groups to OH groups in the mixture is 1.2:1, Raise the temperature to 140-180°C, react under stirring at 200rpm for 2 minutes, then pelletize underwater and collect water-based polyurethane particles;

[0070] Put 20Kg of the above-mentioned water-based polyurethane particles into 50Kg of acetone / water mixture (mass ratio 3:2), then add 700g of TEA, heat up to 70°C, and keep the temperature at 200rpm for 2 hours to ensure that the above-mentioned wa...

Embodiment 2

[0075] Raise the temperature of A component PTMEG1000, B component HDI and C component BDO to 100, 60, and 80°C respectively, add 40ppm DabcoT-9, 0.2%wt Irganox1010, 0.2%wt Irgafos168, 0.4% to A component wt Tinuvin 329, 0.4%wt Tinuvin 292; add DMBA with 1.31 times the mass of BDO to component C, and keep the temperature at 80, 60, 60°C after the above three components are fully melted and uniform;

[0076] After mixing components A, B, and C at a ratio of 57.7%wt, 33.4%wt, and 8.9%wt, add part of HDI so that the molar ratio of NCO groups to OH groups in the mixture is 1.2:1, Raise the temperature to 140-180°C, react under stirring at 200rpm for 6 minutes, then pelletize underwater and collect water-based polyurethane particles;

[0077] Put 20Kg of the above-mentioned water-based polyurethane particles into 50Kg of acetone / water mixture (mass ratio 3:2), then add 69.4Kg of TEA, raise the temperature to 70°C, and keep the temperature at 200rpm for 2 hours to ensure that the ab...

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Abstract

The invention relates to a water-based double-component coating. The water-based double-component coating is prepared from a main agent and a curing agent, the main agent is prepared from 100 parts byweight of hydroxyl group-containing water-based acrylic emulsion, 10 to 50 parts by weight of water-based aliphatic polyurethane dispersant and 1 to 20 parts by weight of additive aids, the curing agent is isocyanate curing agent, and the hydroxyl group content of the hydroxyl group-containing water-based acrylic emulsion is 0.5 to 6 weight percent. According to the invention, by using the water-based aliphatic polyurethane dispersant not containing hydroxyl groups and the hydroxyl group-containing water-based acrylic emulsion with low hydroxyl group content, the prepared double-component coating also has good surface drying time, hard drying time, pencil hardness, water resistance, dry heat resistance and alcohol resistance.

Description

technical field [0001] The invention relates to a water-based two-component paint. Background technique [0002] Most of the existing wood coatings are solvent-based coatings, which contain more than 50% of organic solvents. These solvents will volatilize into the atmosphere during the construction process to pollute the environment and damage human health, and the organic solvents themselves will cause combustion, explosion, etc. Security risks. Therefore, water-based wood coatings are the development trend of international coatings. Waterborne wood coatings include one-component and two-component water-based wood coatings. Among them, the paint film properties of one-component water-based wood coatings include poor water resistance, chemical resistance and hardness, which are far behind oil-based coatings, which seriously limits the popularization and application of water-based wood coatings. The mechanical properties, water resistance and chemical resistance of two-com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/08C08G18/66C08G18/48C08G18/32C08G18/62
CPCC08G18/3206C08G18/4854C08G18/6229C08G18/6674C08L2201/08C09D175/04C08L75/08
Inventor 杨年富
Owner HUZHOU JIFU NEW MATERIALS SCI & TECH CO LTD