Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion

A hydroxy polyacrylate and acrylate technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high viscosity, poor stability, and high acid value of acrylate secondary dispersions, and achieve low acid value and fast speed. The effect of surface drying speed

Active Publication Date: 2015-05-27
上海华谊涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the above-mentioned acrylate secondary dispersion, such as high acid value, high viscosity, low solid content, poor stability, etc., the present invention aims to provide a secondary acrylate dispersion with low acid value and high solid content. Dispersion method

Method used

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  • Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion
  • Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion
  • Method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add the mixture of 32g propylene glycol butyl ether and 32g Solvesso 100 into the reactor, blow nitrogen, stir and raise the temperature to 116-122°C, start to drop 60.1g methyl methacrylate, 56g styrene, 60g hydroxyethyl methacrylate , a mixture of 19.6g n-butyl methacrylate, 60g butyl acrylate and 9g tert-butyl peroxybenzoate, control the rate of addition uniformly, drop the mixture in about 3 hours, and immediately start adding 28.2g methyl The mixture of methyl acrylate, 30g hydroxyethyl methacrylate, 23g butyl acrylate, 8.8g acrylic acid and 3.7g tert-butyl peroxybenzoate was added dropwise at a constant speed, and the dripping was completed within 1h30min. After keeping warm for 30min, add 1.3 g tert-butyl peroxybenzoate, continue to keep warm for 2-3 hours, cool down to 80°C, add 9.8g dimethylethanolamine, stir for 20min, add 366.5g deionized water at a uniform speed within 1h, stir and disperse, and obtain milky white translucent water dispersion. After testing...

Embodiment 2

[0042] Add the mixture of 40g propylene glycol butyl ether and 36g VeoVa 10 (a kind of highly branched tertiary carbonic acid ethylene ester produced by Shell Company) into the reactor, blow nitrogen, stir and raise the temperature to 116~122°C, start to drop 30g methyl A mixture of methyl acrylate, 36g styrene, 88g hydroxypropyl methacrylate, 25g n-butyl methacrylate, 32g butyl acrylate and 8.8g tert-butyl peroxybenzoate, control the rate of addition uniformly, in about 3h The mixture was dropped, and immediately after the drop, the mixture of 25.8g methyl methacrylate, 43g hydroxypropyl methacrylate, 20.6g butyl acrylate, 9.3g acrylic acid and 3.9g tert-butyl peroxybenzoate was added dropwise at a constant speed Add dropwise, finish dropping within 1h30min, after keeping warm for 30min, add 1.3g of tert-butyl peroxybenzoate, continue keeping warm for 2-3h, cool down to 80°C, add 11.1g of dimethylethanolamine, stir for 20min, after 1h Add 443.8 g of deionized water at a const...

Embodiment 3

[0046] Add the mixture of 32g propylene glycol butyl ether and 32g Solvesso 100 into the reactor, blow nitrogen, stir and raise the temperature to 134-140°C, start to add 60.1g methyl methacrylate, 56g styrene, 60g hydroxyethyl methacrylate dropwise , the mixture of 19.6g n-butyl methacrylate, 60g butyl acrylate and 9.2g di-tert-butyl peroxide, control the rate of addition uniformly, drop the mixture within 3h, start to drop 28.2g formazan immediately after dropping The mixture of methyl methacrylate, 30g hydroxyethyl methacrylate, 23g butyl acrylate, 8.8g acrylic acid and 3.8g di-tert-butyl peroxide was added dropwise at a constant speed, and the dripping was completed within 1h30min. After keeping warm for 30min, additional 1.3g of di-tert-butyl peroxide, continue to keep warm for 2~3h, cool down to 80°C, add 9.8g of dimethylethanolamine, stir for 20min, add 366.2g of deionized water at a uniform speed within 1h, stir to disperse, and obtain milky white half Transparent aque...

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Abstract

A method for preparing hydroxy-containing polyacrylate secondary aqueous dispersion includes dropping mixed monomer not containing carboxyl monomer in cosolvent under the condition of introducing nitrogen gas, to generate hydrophobic long chain free radical; dropping mixed monomer containing carboxyl monomer in the generated hydrophobic long chain free radical, and synthesizing to obtain copolymer with its molecular chain tail end containing hydrophilic group; and adding neutralizer in the obtained copolymer, and dropping deionized water. The obtained hydroxy-containing polyacrylate secondary aqueous dispersion has low acid value, small particle diameter, uniform distribution, and good storage stability; and coated film of prepared aqueous two-component polyurethane coating has high gloss and fullness, and good leveling property.

Description

technical field [0001] The present invention relates to the preparation method of raw material for coating industry in the field of chemical industry, in particular, to a method for synthesizing raw material for water-based coating, that is, a method for preparing a secondary aqueous dispersion of hydroxyl-containing polyacrylate. The dispersion can be made into a high-performance water-based coating after being combined with an appropriate cross-linking agent. Background technique [0002] The paint industry is a unique raw material-intensive manufacturing industry. Most organic paints use some raw materials that are harmful to the human body and the environment in the production process, and will emit harmful waste water and waste gas during the production process and construction process, even in For a period of time after construction, harmful gases will be released. However, with the continuous development of science and technology and social productivity, people are p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/04C08F220/14C08F220/28C08F220/18C08F212/08C08F2/06C08F8/00C08J3/07C09D175/04
Inventor 章奕陈菲斐
Owner 上海华谊涂料有限公司
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