Method for preparing organic silicon modified propenoic ester copolymer emusion by fine emulsion polymerizing method

A technology of miniemulsion polymerization and acrylate, which is applied in the field of preparing silicone-modified acrylate copolymer emulsion, which can solve the problems of affecting the effect of silicone modification, increasing silicon-containing branch chains, and difficulty in stretching, so as to reduce the dosage, High system stability, easy to control the effect of production

Inactive Publication Date: 2006-11-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of film formation, due to the short chain length of the silicone branch chain, once bonded to the acrylate main chain, it will be "covered" by other branch chains and easily "embedded" by acrylate resin molecules However, it is difficult to stretch and migrate to the surface of the paint film, which affects the effect of silicone modification. Therefore, from the perspective of molecular design, the length of the silicon-containing branch chain must be increased.

Method used

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  • Method for preparing organic silicon modified propenoic ester copolymer emusion by fine emulsion polymerizing method
  • Method for preparing organic silicon modified propenoic ester copolymer emusion by fine emulsion polymerizing method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) 0.8 gram of sodium lauryl sulfate is dissolved in 75 grams of water to form an aqueous phase solution;

[0031] 2) Mix and stir 10 grams of styrene, 10 grams of butyl acrylate, 0.3 grams of vinyltriethoxysilane, 1 gram of methyltrimethoxysilane, and 1 gram of dimethyldimethoxysilane to form an oil phase solution ;

[0032]3) Mix the above water phase solution and oil phase solution, stir magnetically in an ice-water bath for 10 minutes, and then use Ningbo Kesheng KS-600 Sonifier (amplitude 70%, 600W) to ultrasonically pulverize for 15 minutes to form a fine emulsion;

[0033] 4) The fine emulsion is moved into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen gas inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen gas, it is passed into a 60°C hot water bath, and an aqueous solution of potassium persulfate (0.15 grams of dissolved Initiate polymerization in 5 grams of water), and after 3 hours of polymerizatio...

Embodiment 2

[0035] 1) 0.8 gram of sodium lauryl sulfate is dissolved in 75 grams of water to form an aqueous phase solution;

[0036] 2) Mix 10 grams of methyl styrene, 10 grams of butyl acrylate, 0.3 grams of vinyltriethoxysilane, 1 gram of methyltrimethoxysilane, 1 gram of dimethyldimethoxysilane, 0.4 grams of sixteen Alkanes are mixed and stirred to form an oil phase solution;

[0037] 3) Mix the above water phase solution and oil phase solution, stir magnetically in an ice-water bath for 10 minutes, and then use Ningbo Kesheng KS-600 Sonifier (amplitude 70%, 600W) to ultrasonically pulverize for 15 minutes to form a fine emulsion;

[0038] 4) The fine emulsion is moved into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen gas inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen gas, it is passed into a 60°C hot water bath, and an aqueous solution of potassium persulfate (0.15 grams of dissolved Initiate polymerization in 5 grams...

Embodiment 3

[0040] 1) 0.8 gram of sodium lauryl sulfate is dissolved in 75 grams of water to form an aqueous phase solution;

[0041] 2) Mix 10 grams of methylstyrene, 10 grams of butyl acrylate, 0.3 grams of γ-methacryloxypropyltrimethoxysilane, 1 gram of methyltrimethoxysilane, 1 gram of dimethyldimethoxy Silane and 0.4 gram of stearyl alcohol are mixed and stirred to form an oil phase solution;

[0042] 3) Mix the above water phase solution and oil phase solution, stir magnetically in an ice-water bath for 10 minutes, and then use Ningbo Kesheng KS-600 Sonifier (amplitude 70%, 600W) to ultrasonically pulverize for 15 minutes to form a fine emulsion;

[0043] 4) The fine emulsion is moved into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen gas inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen gas, it is passed into a 60°C hot water bath, and an aqueous solution of potassium persulfate (0.15 grams of dissolved Initiate polymer...

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Abstract

The present invention discloses fine emulsion polymerizing process to prepare organosilicon modified acrylate copolymer emulsion. The process includes the following steps: 1) dissolving emulsifier in 0.01-10 weight portions in water of 50-400 weight portions to form water phase solution; 2) mixing two or more kinds of vinyl monomers in 10-200 weight portions and organosilicon monomer in 1-30 weight portions to form oil phase solution; 3) mixing the water phase solution and the oil phase solution, and crushing in a high shearing field for 2-30 min to form fine emulsion; and 4) transferring the fine emulsion into a reactor, heating to 40-160 deg.c and adding initiator in 0.05-10 weight portions to initiate polymerization for 2-18 hr, and cooling slowly to room temperature before discharging. The process is simple, efficient and environment friendly, and may have organosilicon introduced in relatively high content.

Description

technical field [0001] The invention relates to a method for preparing organosilicon-modified acrylate copolymer emulsion by means of miniemulsion polymerization. Background technique [0002] Because polysiloxane has the characteristics of large bond energy, flexible molecules, low surface energy, and good UV resistance, silicone-modified polyacrylate water-based coatings are expected to become an environmentally friendly building with high weather resistance and stain resistance. It can also be used in adhesives, paper coatings, wood coatings, outer coatings of textile fibers, softeners and water-repellent finishing agents. [0003] Through molecular design, the preparation of silicone-modified polyacrylate emulsions that can be self-crosslinked after film formation, thereby reducing the content of volatile organic compounds (VOC) in water-based coating formulations, has also received attention. Simple physical blending of organopolysiloxane and polyacrylate emulsion to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/10C08F2/22
Inventor 罗英武许华君李宝芳
Owner ZHEJIANG UNIV
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