High performance silicon emulsion and its preparation

A technology of silicone-acrylic emulsion and production method, which is applied in the field of silicone-acrylic emulsion and its production, and can solve problems such as unfavorable environmental protection

Inactive Publication Date: 2005-05-11
上海建研建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet, there are some negative problems in using the latex of high Tg value to prepare exterior wall paint, as: the film-forming process of this type of exter

Method used

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  • High performance silicon emulsion and its preparation

Examples

Experimental program
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Example Embodiment

[0065] Example 1. Polymerization of Seed Emulsion

[0066] Put 800Kg of deionized water, 0.5Kg of disodium hydrogen phosphate, 52Kg of sodium lauryl sulfate, 3.6Kg of ammonium persulfate into the reaction pot, add 139Kg of methyl methacrylate and 4.5Kg of methacrylic acid under stirring conditions , Primary dodecyl mercaptan 0.4Kg, after stirring for 30 minutes, start to heat up to 65-77℃, stop heating, blue light appears in the emulsion, exothermic reaction occurs in the reaction system, the temperature rises to 80-85℃, keep the temperature at 80 -82°C, constant temperature reaction for 30 minutes, the viscosity of the obtained seed emulsion is about 600mPa·s, the glass transition temperature Tg is 12, and the molecular weight is about 340.

Example Embodiment

[0067] Example 2. Polymerization of Seed Emulsion

[0068] Add 700Kg of deionized water, 1Kg of sodium dihydrogen phosphate, 45Kg of sodium lauryl sulfate, 35Kg of nonylphenol polyvinyl ether, and 8.6Kg of dicumyl peroxide into the reaction pot. Add acrylic acid under stirring conditions. Ester 194Kg, methacrylic acid 14.4Kg, t-dodecyl mercaptan 2Kg, after stirring for 30 minutes, the temperature began to rise to 65-77°C, the heating was stopped, blue light appeared in the emulsion, exothermic reaction occurred in the reaction system, and the temperature rose to 80 -85°C, keeping the temperature at 80-82°C, and reacting at a constant temperature for 30 minutes. The viscosity of the obtained seed emulsion is about 800mPa·s, the glass transition temperature Tg is 8, and the molecular weight is about 190.

Example Embodiment

[0069] Example 3. Polymerization of Seed Emulsion

[0070] Add 900Kg of deionized water, 0.1Kg of sodium bicarbonate, 7Kg of nonylphenol polyvinyl ether, 20Kg of alkylphenol polyvinyl ether phosphate, and 1.9Kg of potassium persulfate into the reaction pot, and add methacrylic acid under stirring. Methyl ester 65Kg, acrylic acid 5Kg, and primary lauryl mercaptan 1Kg. After stirring for 30 minutes, the temperature began to rise to 65-77°C, and the heating was stopped. Blue light appeared in the emulsion, exothermic reaction occurred in the reaction system, and the temperature rose to 80-85. ℃, keep the temperature at 80-82℃, and react at a constant temperature for 30 minutes. The viscosity of the obtained seed emulsion is about 400 mPa·s, the glass transition temperature Tg is 14, and the molecular weight is about 260.

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Abstract

This invention relates to high performance of silicon emulsion and its production. It is prepared from octaalkyl cyclotetrasiloxane and octavinyl cyclotetrasiloxane mixed monomer, and acrylic acid monomer acted with catalyst, initiator, emusifier and pH regulator. Its process includes polymerizing seed emulsion, polymerizing nucleic emulsion, and polymerizing nucleic shell silicon emulsion. It has uniformly sized particles and is stable quality and production. Coatings with it are waterproof, weatherproof, washing resistant and stain-resistant.

Description

technical field [0001] The invention relates to a silicone-acrylic emulsion and a production method thereof. Background technique [0002] At present, there are three major series of polymer emulsions for coatings in the world, namely vinyl acetate homo / copolymer emulsion series, (meth)acrylic acid (pure acrylic) copolymer emulsion, and styrene / acrylic acid copolymer emulsion. Acrylic polymer has become a leader among many polymer emulsion products due to its superior film-forming properties, good oil resistance and weather resistance, and excellent adhesion. Since the film-forming mechanism of the emulsion determines that the aging resistance and stain resistance of the latex paint are not ideal, compared with the solvent-based paint, the water-based (emulsion) paint widely used in the market has a large gap in performance. [0003] The key technology for emulsion coatings to replace solvent-based coatings is the challenge of coating film hardness and weather resistance, w...

Claims

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Application Information

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IPC IPC(8): C08F2/22C08F2/44C08F20/06
Inventor 陈安仁江洪申薛群鹰
Owner 上海建研建材科技有限公司
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