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A kind of solvent for vinyl acetate solution polymerization and using method thereof

A technology of vinyl acetate and polyvinyl acetate, applied in the field of preparation of polyvinyl acetate, can solve the problems of human body and environment damage, high volatility, etc., and achieves the effects of safety in the polymerization process, reduced usage, and better operation.

Active Publication Date: 2017-12-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the polymerization solvent methanol used in the traditional vinyl acetate polymerization process is a toxic and harmful substance with high volatility and great harm to the human body and the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Measure 100mL of vinyl acetate into a three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, place it in a constant temperature water bath, and raise the temperature to 70°C. Accurately weigh 0.0093g of azobisisobutyronitrile initiator, dissolve it in 7.5mL of dimethyl carbonate, add it into a three-neck flask, start stirring, and time; after the reaction reaches 120min, add 2.5mL of methanol. After continuing to react for 60 minutes, the product was poured out, and after cooling and removing unreacted monomer and solvent, polyvinyl acetate solid was obtained.

[0022] Measure 150mL of methanol into a three-neck flask equipped with a mechanical stirrer and a reflux condenser, place it in a constant temperature water bath at 70°C, add 9g of solid polyvinyl acetate, and start stirring. After the polyvinyl acetate is completely dissolved, lower the temperature of the water bath to 40°C, slowly add 20g / L sodium hydroxide methanol dropwi...

Embodiment 2

[0024] Measure 100mL of vinyl acetate into a three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, place it in a constant temperature water bath, and raise the temperature to 70°C. Accurately weigh 0.0093g of azobisisobutyronitrile initiator, dissolve it in 11.7mL of dimethyl carbonate, add it into a three-necked flask, start stirring, and time; after the reaction reaches 140min, add 3.3mL of methanol. After continuing to react for 70 minutes, the product was poured out, and after cooling and removing unreacted monomer and solvent, polyvinyl acetate solid was obtained.

[0025] Measure 150mL of methanol into a three-neck flask equipped with a mechanical stirrer and a reflux condenser, place it in a constant temperature water bath at 70°C, add 9g of solid polyvinyl acetate, and start stirring. After the polyvinyl acetate is completely dissolved, lower the temperature of the water bath to 40°C, slowly add 20g / L sodium hydroxide methanol dro...

Embodiment 3

[0027]Measure 100mL of vinyl acetate into a three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, place it in a constant temperature water bath, and raise the temperature to 70°C. Accurately weigh 0.0093g of azobisisobutyronitrile initiator, dissolve it in 16.0mL of dimethyl carbonate, add it into a three-neck flask, start stirring, and time; after the reaction reaches 100min, add 4.0mL of methanol. After continuing to react for 50 minutes, the product was poured out, and after cooling and removing unreacted monomer and solvent, polyvinyl acetate solid was obtained.

[0028] Measure 150mL of methanol into a three-neck flask equipped with a mechanical stirrer and a reflux condenser, place it in a constant temperature water bath at 70°C, add 9g of solid polyvinyl acetate, and start stirring. After the polyvinyl acetate is completely dissolved, lower the temperature of the water bath to 40°C, slowly add 20g / L sodium hydroxide methanol dropwi...

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Abstract

A solvent for solution polymerization of vinyl acetate, comprising the following components: dimethyl carbonate, methanol. The use method is that the components dimethyl carbonate and methanol in the solvent used in the polymerization process of vinyl acetate are used separately and added to the reaction at different times. The present invention uses dimethyl carbonate and methanol as the polymerization solvent for the polymerization of vinyl acetate. Because the solvent is mainly dimethyl carbonate, the amount of methanol used is reduced, and the composition of toxic and harmful substances in the reaction process is reduced. The main dimethyl carbonate is non-toxic and harmless, the polymerization process is safe and easy to operate; it consumes less energy and is safe and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyvinyl acetate, and relates to a solvent for solution polymerization of vinyl acetate and a using method thereof. Background technique [0002] There are four main polymerization methods of polyvinyl acetate (PVAc): (1) solution polymerization, that is, polymerization in which VAC and initiator are dissolved in a solvent. This method belongs to free radical polymerization, and its polymerization reaction mechanism is divided into four types: Process: chain initiation, chain growth, chain transfer and chain termination. The advantage of solution polymerization is that the viscosity of the reaction system becomes lower after adding the solvent, which is beneficial to the mixing and transportation of materials. At the same time, the solvent can be used as a heat transfer medium to control the temperature of the reaction, and it is not easy to cause local overheating; however, due to the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F118/08C08F2/06
Inventor 陈小鹏王海伶梁杰珍王琳琳梁瑞雪
Owner GUANGXI UNIV
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