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Water-based hydroxy acrylic resin dispersion and preparation method thereof

A hydroxyacrylic acid and dispersion technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of insufficient dispersion stability, slow drying speed, and poor water resistance of water-based hydroxyacrylic resins, so as to reduce the disadvantages of paint films. , Good water resistance, the effect of speeding up the drying speed

Pending Publication Date: 2021-03-16
商丘市博大化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are still many difficulties in the large-scale use of waterborne polyurethane coatings, among which the dispersion stability of waterborne hydroxyacrylic resin is insufficient, the drying speed is slow, the water resistance is poor, and the moisture in the system reacts with polyisocyanate to produce microbubbles, which leads to a decrease in gloss, etc. It is a few common technical problems

Method used

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  • Water-based hydroxy acrylic resin dispersion and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 141.1 parts of ethyl isocyanate acrylate and 103.1 parts of γ-aminobutyric acid were reacted at 30°C for 2 hours to obtain a functional carboxyl monomer. Put 20 parts of ethylene glycol ethyl ether into the reaction kettle, raise the temperature to 150°C, add dropwise 5 parts of functional carboxyl-containing monomers, 15 parts of hydroxyethyl methacrylate, 15 parts of methyl methacrylate, butyl methacrylate 10 parts, 20 parts of butyl acrylate, 20 parts of styrene, and 3 parts of di-tert-butyl peroxide mixed solution, then keep it at 150°C for 3h, cool down to 60-70°C, add 2.2 parts of triethylamine for neutralization, Then add 95 parts of deionized water for high-speed dispersion to obtain a water-based hydroxyacrylic resin dispersion. The obtained aqueous hydroxyacrylic resin dispersion had a solid content of 45.2% and a viscosity of 450 mPa·s.

Embodiment 2

[0025] React 141.1 parts of ethyl isocyanate acrylate with 103.1 parts of γ-aminobutyric acid at 25-30°C for 2 hours to obtain a functional carboxyl group-containing monomer. Put 20 parts of propylene glycol dimethyl ether into the reaction kettle, raise the temperature to 160°C, add 6 parts of functional carboxyl-containing monomers, 10 parts of hydroxypropyl acrylate, 8 parts of hydroxyethyl acrylate, and 15 parts of isobornyl methacrylate , 25 parts of butyl acrylate, 15 parts of styrene, and 4 parts of di-tert-amyl peroxide, and then kept at 160°C for 3 hours, cooled to 60°C, added 2.3 parts of dimethylethanolamine for neutralization, and then added 105 parts of ionized water were dispersed at a high speed to obtain a water-based hydroxyacrylic resin dispersion. The obtained aqueous hydroxyacrylic resin dispersion had a solid content of 40.5% and a viscosity of 420 mPa·s.

Embodiment 3

[0027] 141.1 parts of ethyl isocyanate acrylate and 103.1 parts of γ-aminobutyric acid were reacted at 25°C for 2 hours to obtain functional carboxyl-containing monomers. Put 15 parts of dipropylene glycol dimethyl ether into the reaction kettle, raise the temperature to 160°C, add 7 parts of functional carboxyl-containing monomers, 10 parts of hydroxypropyl methacrylate, 10 parts of hydroxyethyl methacrylate, methacrylic acid A mixture of 20 parts of isobutyl ester, 20 parts of butyl acrylate, 10 parts of styrene, 5 parts of α-methylstyrene, and 5 parts of dicumyl peroxide is then kept at 160°C for 3 hours, and then cooled to 60°C. 1.2 parts of sodium hydroxide was added for neutralization, and then 115 parts of deionized water was added for high-speed dispersion to obtain a water-based hydroxyacrylic resin dispersion. The obtained aqueous hydroxyacrylic resin dispersion had a solid content of 40.2% and a viscosity of 480 mPa·s.

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Abstract

The invention provides a water-based hydroxy acrylic resin dispersion and a preparation method thereof. The water-based hydroxy acrylic resin dispersion is prepared from the following raw materials inparts by weight: 15-25 parts of a hydrophilic solvent, 3-8 parts of a functional carboxyl monomer, 10-30 parts of a hydroxyl-containing monomer, 30-50 parts of an acrylate monomer, 10-20 parts of a vinyl monomer, 3-10 parts of an initiator, 1-4 parts of a basic compound, and 80-120 parts of deionized water; wherein the functional carboxyl monomer contains a secondary amino group and a long-chaincarboxyl group. According to the invention, the stability and water resistance of the water-based hydroxy acrylic resin dispersion are improved, the drying speed of the coating can be increased, the probability of side reaction with isocyanate is reduced, and the defects of a paint film are reduced.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane coatings, in particular to a water-based hydroxyacrylic resin dispersion and a preparation method thereof. Background technique [0002] In recent years, the emission of volatile organic compounds (VOC) in the coating industry has attracted widespread attention from the state and society. Environmentally friendly water-based coatings, high-solid coatings, light-curing coatings, and solvent-free coatings are becoming mainstream products in the coatings industry. [0003] Waterborne hydroxyacrylic resin dispersion is the main raw material of waterborne polyurethane coatings, and its performance and stability play a decisive role in the promotion and use of waterborne polyurethane coatings. Waterborne hydroxyacrylic resin dispersion needs to be used together with waterborne polyisocyanate curing agent to prepare high-end waterborne polyurethane coatings, which can be used in automobi...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F212/08C08F220/20C08F220/14C08F220/36C08F212/12C09D175/04
CPCC08F220/1804C08F212/08C08F220/1806C08F220/1802C09D175/04C08F220/20C08F220/14C08F220/365C08F220/1811C08F212/12C08F220/1808
Inventor 宋学礼马晓阳韩知非
Owner 商丘市博大化工有限公司
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