Method for preparing acrylic aqueous dispersion with hydroxyl through two-step polymerization

A technology of hydroxyacrylic acid and polymerization method, used in the field of chemical coatings, can solve the problems of high viscosity, low stability and poor film performance of water dispersion, and achieve the effect of increasing water resistance, reducing viscosity and good film performance.

Inactive Publication Date: 2010-02-17
ZHEJIANG HUANDA PAINT IND GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aqueous dispersion prepared according to this method has high visc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] In a reaction vessel equipped with a stirring, cooling and heating device, add 200g of propylene glycol methyl ether acetate, heat up to 140°C while blowing nitrogen, and then start to add 90g of methacrylic acid-β-hydroxyethyl and 33 styrene. , 5g acrylic acid, 22g isobornyl methacrylate, 130g butyl acrylate, 8.4g tert-amyl peroxyacetate, 1.4g dodecanethiol. Control the dripping in about 90 minutes, then keep it warm for 15 minutes; then start dripping 62g β-hydroxyethyl methacrylate, 22g styrene, 18g acrylic acid, 10g isobornyl methacrylate, 77g butyl acrylate, 5.67g Oxidized tert-amyl acetate, 0.945g dodecanethiol. Control the dripping in about 60 minutes, continue to keep the temperature for 2 to 3 hours, cool the resin to 70°C, evaporate part of the solvent in a vacuum, and control the solvent content in the resin to 0-20wt%, and then pour the resin into a special container for dispersion , Put 38g of triethanolamine in a high-speed disperser for ...

Example Embodiment

[0062] Example 2

[0063] In a reaction vessel equipped with a stirring, cooling and heating device, add 200g of propylene glycol methyl ether acetate, heat up to 140°C while blowing nitrogen, and then start to add 90g of methacrylic acid-β-hydroxyethyl and 33 styrene. , 5g acrylic acid, 22g isobornyl methacrylate, 130g butyl acrylate, 8.4g tert-amyl peroxyacetate, 1.4g dodecanethiol. Control the dripping in about 90 minutes, then keep it warm for 15 minutes; then start dripping 62g β-hydroxyethyl methacrylate, 22g styrene, 18g acrylic acid, 10g isobornyl methacrylate, 77g butyl acrylate, 5.67g Oxidized tert-amyl acetate, 0.945g dodecanethiol. Control the dripping in about 60 minutes, continue to keep the temperature for 2 to 3 hours, cool the resin to 70°C, evaporate part of the solvent in a vacuum, and control the solvent content in the resin to 0-20wt%, and then pour the resin into a special container for dispersion ,In a high-speed disperser, put 22g of dimethylethanolamine...

Example Embodiment

[0074] Example 3

[0075] In a reaction vessel equipped with a stirring, cooling and heating device, add 200g of propylene glycol methyl ether acetate, heat up to 140°C while blowing nitrogen, and then start to add 90g of methacrylic acid-β-hydroxyethyl and 33 styrene. , 5g acrylic acid, 22g isobornyl methacrylate, 130g butyl acrylate, 8.4g tert-amyl peroxyacetate, 1.4g dodecanethiol. Control the dripping in about 90 minutes, then keep it warm for 15 minutes; then start dripping 62g β-hydroxyethyl methacrylate, 22g styrene, 18g acrylic acid, 10g isobornyl methacrylate, 77g butyl acrylate, 5.67g Oxidized tert-amyl acetate, 0.945g dodecanethiol. Control the dripping in about 60 minutes, continue to keep the temperature for 2 to 3 hours, cool the resin to 70°C, evaporate part of the solvent in a vacuum, and control the solvent content in the resin to 0-20wt%, and then pour the resin into a special container for dispersion In a high-speed disperser, 25g of triethylamine was put int...

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Abstract

The invention provides a method for preparing acrylic aqueous dispersions with hydroxyl through two-step polymerization and the method comprises the synthesis of hydroxy acrylic resin, the removal ofsolvent, the neutralization and salt-formation and the deionized water dispersion, wherein the synthesis of hydroxy acrylic resin adopts two-step feeding synthesis method instead of one-step feeding method in prior art, the composition of the first added monomer mixture is different from that of the second added monomer mixture and preferentially, the weight percent of the second added hydrophilicmonomer is higher than that of the first added monomer when feeding tends to end up. The aqueous dispersions obtained by the technical solution of the invention reduces the dosage of monomer with hydroxyl so as to increase the water resistance of coating which is formed by combining aqueous dispersions and curing agent, reduce the grain size of dispersions, lower the viscosity and increase the stability obviously.

Description

Technical field [0001] The invention relates to the field of chemical coatings, in particular to a method for preparing a hydroxyl-containing acrylic water dispersion by a two-step polymerization method. Background technique [0002] Since the volatile organic compounds (VOC) of water-based two-component polyurethane coatings are significantly reduced, and the performance is better than or equivalent to that of solvent-based two-component polyurethane coatings, the research and development of water-based two-component polyurethanes has become very active in recent years. For example, using the raw materials provided by Bayer and other suppliers in Germany, paint manufacturers have developed quick-drying water-based polyurethane coatings for woodware. This water-based polyurethane coating has replaced solvent-based polyurethane coatings for high-end wooden office supplies. In addition to low VOC and high decorative properties, this water-based polyurethane coating can meet strict ...

Claims

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Application Information

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IPC IPC(8): C08L33/04C08F220/10C08F220/26C08F212/08C08F220/06C08F220/44C08F2/06C08F8/00C08J3/07
Inventor 刘娅莉刘阳燕刘志平曹银祥余喜红金土才
Owner ZHEJIANG HUANDA PAINT IND GROUP
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