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Polymer emulsion and preparation method thereof

A technology of polymer emulsion and emulsifier, applied in the field of polymer emulsion and its preparation, can solve the problems of little research on polymerizable emulsifier, affecting water resistance of membrane, etc., to avoid potential safety and health risks, improve water resistance, and simple reaction process easy-to-control effects

Inactive Publication Date: 2010-06-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using traditional emulsifiers for emulsion polymerization, the residual emulsifiers in the polymerization product will affect the water resistance of the film
The research on the use of reactive emulsifiers in polymer emulsion polymerization has been reported, but the hydrocarbon chain polymerizable emulsifiers are generally used, and there is little research on the polymerizable emulsifiers containing silicone

Method used

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  • Polymer emulsion and preparation method thereof
  • Polymer emulsion and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0020] Put 50g of styrene, 18g of butyl acrylate, 3.6g of acrylic acid and 24g of deionized water into a 250ml four-necked flask and stir, add 2g of polymerizable silicone emulsifier PMSC (n=5~6), heat up to 25°C and add 0.32 g ammonium persulfate, stirred for 30 minutes to adjust pH=7 for subsequent use. Add 50g of deionized water, 0.16g of ammonium persulfate, 0.24g of sodium bicarbonate, and 0.24g of emulsifier PMSC into a 250ml four-neck flask. Under nitrogen protection, stir and heat up to 70°C, add 20g of pre-emulsion, and continue to heat up to At 82°C, the inside of the flask began to turn blue, and the pre-emulsion was added dropwise. The temperature was controlled at about 85°C, and the dropping speed was controlled so that the monomer pre-emulsion was dripped for 2.5 hours. After the dropwise addition, 0.14 g of ammonium persulfate was added, kept for 1.5 h, cooled to 40°C at room temperature, and adjusted to PH=7 to obtain the product. The latex film of the produc...

Embodiment 2

[0022] Put 48g of methyl methacrylate, 12g of methyl acrylate, 1g of octadecyl acrylate, 4g of acrylic acid and 23g of deionized water into a 250ml four-necked flask and stir, then add 2.2g of polymerizable silicone emulsifier PMSC (n=3~ 4), heat up to 30°C, add 0.3g ammonium persulfate, stir for 1 hour, adjust pH=6.9 for later use. Add 50g of deionized water, 0.15g of ammonium persulfate, 0.22g of sodium bicarbonate, and 0.28g of emulsifier PMSC into a 250ml four-neck flask. Under nitrogen protection, stir and heat up to 73°C, add 15g of pre-emulsion, and continue to heat up to At 80°C, the inside of the flask began to turn blue, and the pre-emulsion was added dropwise. The temperature was controlled at 85°C, the dropping speed was controlled, and the monomer pre-emulsion was dripped in 2 hours. After the dropwise addition, 0.15 g of ammonium persulfate was added, kept for 1 h, cooled to 30° C. at room temperature, and adjusted to PH=8 to obtain the product. The latex film o...

Embodiment 3

[0024] Put 60g of butyl methacrylate, 20g of butyl acrylate, 1.4g of octadecyl acrylate, 4g of acrylic acid and 35g of deionized water into a 250ml four-necked flask and stir, add 3g of polymerizable silicone emulsifier PMSC (n=7~ 8), heat up to 25°C, add 0.4g of ammonium persulfate, stir for 30 minutes to adjust pH=7.3 for later use. Add 45g of deionized water, 0.2g of potassium persulfate, 0.28g of sodium bicarbonate, and 0.3g of emulsifier PMSC into a 250ml four-neck flask. Under nitrogen protection, stir and heat up to 70°C, add 30g of pre-emulsion, and continue to heat up to At 80°C, the inside of the flask began to turn blue, and the pre-emulsion was added dropwise. The temperature was controlled at 84°C, and the dropping speed was controlled. The monomer pre-emulsion was dripped in 2.2 hours. After the dropwise addition, 0.14 g of potassium persulfate was added, kept at temperature for 1.5 h, cooled at room temperature to 35° C., and adjusted to pH = 7.5 to obtain the p...

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Abstract

The invention discloses polymer emulsion and a preparation method thereof. The polymer emulsion is characterized by using hard monomer, soft monomer and crylic acid as polymer monomers, using crylic acid long-chain alkyl ester as modified monomer, using polymerizable organosilicon emulsifier PMSC as the emulsifier of the system and using thermal decomposition initiator as the initiator to obtain high-performance polymer emulsion by semi-continuous type emulsion copolymerization. The polymer emulsion obtained by the method has favorable waterproofness, water resistance, weather resistance, adhesiveness and film coating effect, and can be widely used as paint, adhesive, fabric waterproof agent, and the like, thereby having bright development potential.

Description

field of invention [0001] The invention relates to a semi-continuous emulsion copolymerization using conventional soft and hard monomers as polymerized monomers, long-chain alkyl acrylates as hydrophobically modified monomers, and polymerizable silicone emulsifier PMSC as emulsifiers. Polymer emulsion and its preparation method. Background technique [0002] High-performance polymer emulsions are widely used in interior and exterior wall coatings, floor polishes, and paper coating adhesives because of their excellent film-forming properties, water resistance, weather resistance, color retention, and adhesion. However, when using traditional emulsifiers for emulsion polymerization, the residual emulsifiers in the polymerization product will affect the water resistance of the film. The research on the use of reactive emulsifiers in polymer emulsion polymerization has been reported, but the polymerizable emulsifiers with hydrocarbon chains are generally used, and there are few...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/14C08F220/18C08F220/06C08F230/08C08F2/26
Inventor 陈洪龄许澎
Owner NANJING UNIV OF TECH
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