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Hydroxyl acrylic resin aqueous dispersion and preparation method thereof

A technology of hydroxyacrylic acid and dispersion, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of low foam-free film thickness, side reactions of curing agents, high overall cost of coatings, etc., to improve the foam-free film thickness, Good bubble-free film thickness and good emulsification effect

Active Publication Date: 2021-03-23
GUANGZHOU GUANZHI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, hydrophilic modified water-dispersed isocyanate curing agent and hydroxyl acrylic resin water dispersion are often used to compound waterborne two-component polyurethane coatings, but the hydrophilic modified water-dispersed isocyanate curing agent has a high content of hydrophilic groups. , the curing agent is more likely to have side reactions with water, and generally has the problems of not high foam-free film thickness, short usable time, and poor water resistance, and there is still a significant gap between solvent-based coatings and solvent-based coatings.
Due to the high price of water-dispersed isocyanate curing agent, the overall cost of coatings will be much higher than that of solvent-based coatings, which limits the further promotion of water-based two-component polyurethane coatings

Method used

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  • Hydroxyl acrylic resin aqueous dispersion and preparation method thereof
  • Hydroxyl acrylic resin aqueous dispersion and preparation method thereof
  • Hydroxyl acrylic resin aqueous dispersion and preparation method thereof

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Embodiment 1

[0029] A kind of aqueous dispersion of hydroxyacrylic resin compatible with solvent type isocyanate curing agent of the present invention and a kind of embodiment of preparation method thereof, specifically as follows:

[0030] (1) Synthesis of unsaturated monomer IM1 containing HDI trimer structure

[0031] Add 100.0g Desmodur N 3300 (Covestro HDI trimer, NCO value 21.8%), 0.16g BHT, 0.16g bismuth isooctanoate into the reaction vessel, raise the temperature to 90°C, slowly add 19.3g methacrylic acid hydroxy Ethyl ester was dripped into the reaction vessel, and the dripping was completed in about 30 minutes, and then kept at 90° C. for 3 hours. Slowly add 113.4g of Dehydrol O4 (Corning non-ionic surfactant, adduct of 1mol octanol and 4mol ethoxy) in about 30 minutes, then keep warm at 90°C until the NCO value is zero. The obtained clear transparent liquid is the unsaturated monomer IM1 containing HDI trimer structure, and its approximate structure is as follows, which conform...

Embodiment 2

[0037] A kind of aqueous dispersion of hydroxyacrylic resin compatible with solvent type isocyanate curing agent of the present invention and a kind of embodiment of preparation method thereof, specifically as follows:

[0038] (1) Synthesis of unsaturated monomer IM1 containing HDI trimer structure

[0039] Add 100.0g Desmodur N 3300 (Covestro HDI trimer, NCO value 21.8%), 0.16g BHT, 0.16g bismuth isooctanoate into the reaction vessel, raise the temperature to 90°C, slowly add 19.3g methacrylic acid hydroxy Ethyl ester was dripped into the reaction vessel, and the dripping was completed in about 30 minutes, and then kept at 90° C. for 3 hours. Slowly add 113.4g of Dehydrol O4 (Corning non-ionic surfactant, adduct of 1mol octanol and 4mol ethoxy) in about 30 minutes, then keep warm at 90°C until the NCO value is zero. The obtained clear transparent liquid is the unsaturated monomer IM1 containing HDI trimer structure, and its approximate structure is as follows, which conform...

Embodiment 3

[0045] A kind of aqueous dispersion of hydroxyacrylic resin compatible with solvent type isocyanate curing agent of the present invention and a kind of embodiment of preparation method thereof, specifically as follows:

[0046] (1) Synthesis of unsaturated monomer IM2 containing HDI trimer structure

[0047] Add 100.0g Desmodur N 3300 (Covestro HDI trimer, NCO value 21.8%), 0.16g BHT, 0.16g bismuth isooctanoate into the reaction vessel, raise the temperature to 90°C, slowly add 21.4g acrylate-4- The hydroxybutyl ester was dropped into the reaction vessel, and the drop was completed in about 30 minutes, and then kept at 90° C. for 3 hours. Slowly add 172.0g Lutensol TO-6 (BASF non-ionic surfactant, adduct of 1 mol isomeric tridecanyl alcohol and 6 mol ethoxy) for about 30 minutes, then keep warm at 90°C until the NCO value is zero. The obtained clear transparent liquid is the unsaturated monomer IM1 containing HDI trimer structure, and its approximate structure is as follows,...

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Abstract

The invention belongs to the technical field of water-based resin, and discloses a hydroxyl acrylic resin aqueous dispersion and a preparation method thereof. The hydroxyl acrylic resin aqueous dispersion comprises the following preparation raw materials: a hydroxyl-containing unsaturated monomer A1, a hydrophobic unsaturated monomer B1, a hydroxyl-containing unsaturated monomer A2, a hydrophobicunsaturated monomer B2, an unsaturated monomer C containing an HDI trimer structure, and a hydrophilic monomer D containing carboxylic acid or sulfonic acid. The hydroxyl acrylic resin aqueous dispersion prepared from the unsaturated monomer C containing the HDI trimer structure can be compounded with a solvent type isocyanate curing agent with low price, so that the high-gloss water-based two-component polyurethane coating is obtained. The water-based two-component polyurethane coating has excellent bubble-free film thickness, can be used for a long time and has water resistance.

Description

technical field [0001] The invention belongs to the technical field of water-based resins, and in particular relates to an aqueous dispersion of hydroxyacrylic resin and a preparation method thereof. Background technique [0002] Due to increasingly stringent environmental protection regulations, the use of solvent-based coatings is increasingly restricted, and low-VOC water-based coatings are the current development trend of the coatings industry. Water-based two-component polyurethane coatings have the characteristics of high gloss and fullness, good weather resistance, and good chemical resistance. The comprehensive performance is close to or reaches that of solvent-based two-component polyurethane coatings. Therefore, it has attracted widespread attention at home and abroad, and research and development are also relatively active . [0003] At present, hydrophilic modified water-dispersed isocyanate curing agent and hydroxyl acrylic resin water dispersion are often used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F220/14C08F220/18C08F220/36C08F220/06C09D175/04
CPCC08F220/20C09D175/04C08F220/14C08F220/1811C08F220/1804C08F220/36C08F220/06
Inventor 欧阳洁谭星
Owner GUANGZHOU GUANZHI NEW MATERIAL TECH
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