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Method for preparing hydroxyl acrylic acid water dispersoid

A hydroxyacrylic acid and dispersion technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of difficulty in achieving the performance of solvent-based two-component polyurethane coatings, poor water resistance of coating films, and large particle size of dispersions. Effects of low solvent content, long pot life and narrow particle size distribution

Inactive Publication Date: 2011-01-19
ZHEJIANG HUANDA PAINT IND GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many domestic patents on the preparation of water-based hydroxyacrylic resins, such as patents CN1557892A, CN1583917A, CN1162964, and CN1230971, all of which are prepared by emulsion polymerization. The particle diameters of these dispersions are relatively large, and the final properties of the coating film such as gloss Low, low hardness of the paint film, poor water resistance of the paint film, etc., it is difficult to achieve the performance of solvent-based two-component polyurethane coatings

Method used

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  • Method for preparing hydroxyl acrylic acid water dispersoid
  • Method for preparing hydroxyl acrylic acid water dispersoid
  • Method for preparing hydroxyl acrylic acid water dispersoid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Firstly, 90 g of propylene glycol methyl ether acetate and 20 g of glycidyl tert-carbonate were added to a reaction kettle equipped with a condensing device and a stirring rod, and the temperature was raised to a reflux temperature of 140° C. while feeding nitrogen. After constant temperature, start to drop the mixed solution composed of non-functional (meth)acrylate, hydroxyl-containing (meth)acrylate, (meth)acrylic acid, vinyl monomer, partial initiator and chain regulator (20 g of methyl methacrylate, 10 g of styrene, 10 g of butyl acrylate, 30 g of hydroxypropyl acrylate, 15 g of acrylic acid, 1 g of dodecyl mercaptan, 4 g of t-amyl peroxyacetate). Control the dropping speed, add the monomer mixture within 2 to 3 hours, keep it for 0.5 to 1 hour, then add a mixed solution of 0.5g initiator and 5g propylene glycol methyl ether acetate, keep warm for 2 to 3 hours, and measure the hydroxyl The conversion rate of the acrylate resin reaches over 98%, and then the temperat...

Embodiment 2

[0049] First put 24g of glycidyl tert-carbonate and 80g of propylene glycol methyl ether acetate into a reaction kettle with a condensing device and a stirring rod, and raise the temperature to 140° C. while blowing nitrogen. After constant temperature, start to drop the mixed solution composed of non-functional (meth)acrylate, hydroxyl-containing (meth)acrylate, (meth)acrylic acid, vinyl monomer, partial initiator and chain regulator (30g methyl methacrylate, 10g styrene, 6g butyl acrylate, 10g hydroxypropyl acrylate, 14g hydroxyethyl methacrylate, 12g acrylic acid, 1g dodecyl mercaptan, 3g tert-amyl peroxyacetate) . The monomer mixture is dropped within 2 to 3 hours, and kept for 0.5 to 1 hour, then a mixed solution of 0.3g of initiator and 4g of propylene glycol methyl ether acetate is added, and the temperature is continued for 2 to 3 hours to measure the hydroxyacrylate resin. The conversion rate reaches over 98%, and then the temperature is lowered to 80° C., and part o...

Embodiment 3

[0054] First, 86g of propylene glycol methyl ether acetate and 20g of glycidyl tert-carbonate were added to a reaction kettle equipped with a condensing device and a stirring rod, and the temperature was raised to 130°C while blowing nitrogen. After constant temperature, start to drop the mixed solution composed of non-functional (meth)acrylate, hydroxyl-containing (meth)acrylate, (meth)acrylic acid, vinyl monomer, partial initiator and chain regulator (Methyl methacrylate 22g, styrene 10g, butyl acrylate 10g, hydroxyethyl methacrylate 32g, methacrylic acid 12g, dodecyl mercaptan 1g, tert-amyl peroxyacetate 3g. Monomer mixture After dropping within 2 to 3 hours, keep it for 0.5 to 1 hour, then add a mixed solution of 0.3g initiator and 5g propylene glycol methyl ether acetate, and continue to keep warm for 2 to 3 hours, and the conversion rate of hydroxyacrylate resin is determined to reach 98%. % above, then lower the temperature to 90°C, evaporate part of the solvent in vacu...

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Abstract

The invention relates to a preparation method for the hydroxyl acrylic aqueous dispersion of high performance and two-component waterborne polyurethane, which comprises four steps: synthesizing hydroxyl acrylic resin, removing a solvent, a neutralization salt forming reaction and deionization and aqueous dispersion. The hydroxyl acrylic aqueous dispersion prepared by the invention has proper molecular weight and the molecular weight is distributed much narrower, thus being beneficial for forming a uniform coating, reducing the plasticizing effect of small molecule substance to the coating, and increasing the comprehensive performance of the coating. The dispersion can be combined with an isocyanate curing agent to be used as wood coatings, corrosion protective coatings, industrial maintenance coatings, floor coatings and the like, and also can be used for preparing a two-component waterborne polyurethane adhesive, etc.

Description

(1) Technical field [0001] The invention belongs to the field of chemical coatings, in particular to a method for preparing a hydroxyacrylic water dispersion used for high-performance two-component waterborne polyurethane. (2) Background technology [0002] Acrylic resin has many excellent characteristics such as weather resistance, good chemical stability, high gloss, etc., and is widely used in the field of chemical coatings. In recent years, with the enhancement of people's awareness of environmental protection and the requirement of building a resource-saving society, the use of solvent-based industrial coatings has become more and more strictly restricted. Hydroxyl-containing acrylic acid aqueous dispersion can be used with isocyanate curing agent to prepare water-based two-component polyurethane coatings. Water replaces toxic and harmful organic solvents. It has the advantages of non-toxicity, environmental protection, and energy saving. It has received extensive atten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/04C08F220/10C08F220/26C08F2/06C08F8/00C08J3/07C09D175/04
Inventor 刘娅莉余喜红曹银祥刘志平金土才任娜娜李红星
Owner ZHEJIANG HUANDA PAINT IND GROUP
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