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Preparation method of styrene-acrylonitrile copolymer

A technology of acrylonitrile and styrene, which is applied in the field of preparation of styrene-acrylonitrile copolymers, can solve problems affecting the quality of SAN resin, uneven polymer composition, and uneven temperature of the polymerization tank, so as to ensure composition stability, The effect of eliminating local unevenness and excellent performance

Active Publication Date: 2020-04-10
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be divided into two stages of feeding, and each stage of feeding is a different ratio of raw materials, which is difficult to accurately control. The effective volume of the reactor of the first polymerization tank is controlled at 75%. At a reaction temperature higher than the boiling point of the monomer, even if There is no monomer evaporation heat transfer, and the evaporation gas phase region will also be formed in the first polymerization tank. The existence of the gas phase region will lead to locally produced polymers with inhomogeneous composition
Moreover, the heat transfer method of external jacket cooling will also lead to uneven temperature in the polymerization tank, and these factors will affect the quality of SAN resin

Method used

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  • Preparation method of styrene-acrylonitrile copolymer
  • Preparation method of styrene-acrylonitrile copolymer
  • Preparation method of styrene-acrylonitrile copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Add 75Kg styrene (SM), 25Kg acrylonitrile (AN) and 0.065Kg chain transfer agent tertiary dodecyl mercaptan into the 200L batching tank 1, mix well and cool to -20°C through the first heat exchanger 2.

[0063] Through the melt booster pump 3, the above raw material mixture is continuously transported at a feed rate of 10L / h to a fully mixed flow polymerization kettle 4 with a volume of 10L and good heat preservation. The feed temperature of the mixed liquid is controlled to maintain the temperature in the kettle at about 150°C, the average residence time of the material in the kettle is 1h, and the slurry A is obtained by overflowing and discharging from the top of the kettle. After testing, the monomer conversion rate of the first stage is 39%.

[0064] The overflowed slurry A is continuously transported to the rear stage, and N, N-dimethylformamide is continuously added to the pipeline for transporting the slurry A at a feed rate of 1 L / h through the monomer and solve...

Embodiment 2

[0067] Add 80Kg styrene, 20Kg acrylonitrile and 0.06Kg chain transfer agent tertiary dodecyl mercaptan into the 200L batching tank 1, mix well and cool to -25°C through the first heat exchanger 2.

[0068] Through the melt booster pump 3, the above raw material mixture is continuously transported at a feed rate of 6.6L / h to a fully mixed flow polymerization kettle 4 with a volume of 10L and good heat preservation. The feed temperature of the raw material mixture is controlled to maintain the temperature in the kettle at about 140°C. The average residence time of the material in the kettle is 1.5h, and the slurry A is obtained by overflowing and discharging from the top of the kettle. After testing, the monomer conversion rate of the first stage is 42%.

[0069] Continuously transport the overflowed slurry A to the subsequent stage, and continuously add N,N-dimethylformamide to the pipeline for transporting the slurry A at a feed rate of 0.66L / h through the monomer and solvent...

Embodiment 3

[0072] Add 80Kg styrene, 20Kg acrylonitrile and 0.06Kg chain transfer agent tert-dodecyl mercaptan into the 200L batching tank 1, mix well and cool to -10°C through the first heat exchanger 2.

[0073] Through the melt booster pump 3, the above raw material mixture is continuously transported at a feed rate of 12.5L / h to a fully mixed flow polymerization kettle 4 with a volume of 10L and good heat preservation. The feed temperature of the raw material mixture is controlled to maintain the temperature in the kettle at about 150°C. The average residence time of the material in the kettle is 0.8h, and the material is overflowed from the top of the kettle to obtain the slurry A. After testing, the monomer conversion rate of the first stage is 35%.

[0074] Continuously transport the overflowed slurry A to the subsequent stage, and continuously add N,N-dimethylformamide to the pipeline for transporting the slurry A at a feed rate of 1.26L / h through the monomer and solvent feed lin...

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Abstract

The invention provides a preparation method of a styrene-acrylonitrile copolymer, which comprises the following steps: mixing a styrene monomer and an acrylonitrile monomer, cooling, feeding an obtained mixture into a first reactor, reacting while keeping a full state, controlling the temperature, feeding an obtained product into a second reactor, continuously reacting while keeping the full state, and finally devolatilizing. The invention also provides the styrene-acrylonitrile copolymer prepared by the preparation method provided by the invention. According to the preparation method providedby the invention, heat insulation or nearly heat insulation can be achieved in the whole polymerization reaction process; the stability of the polymerization reaction temperature can be effectively controlled without external heat transfer so as to ensure the stability of the composition of the obtained copolymer, the prepared copolymer has excellent optical performance, and the preparation method has characteristics of simple process, easy control and no requirement of complex equipment, such that the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of styrene-acrylonitrile copolymers, in particular to a preparation method of styrene-acrylonitrile copolymers. Background technique [0002] Acrylonitrile-styrene copolymer (also known as SAN resin or AS resin) is a high molecular polymer formed by the copolymerization of acrylonitrile and styrene, which has excellent processing properties. SAN resin has good dimensional stability, weather resistance, heat resistance, oil resistance, vibration resistance and chemical stability, and is widely used in the fields of automobiles, construction, stationery, hardware appliances and modern functional materials. [0003] The industrial production of styrene-acrylonitrile copolymer adopts the third-generation continuous bulk polymerization method, using styrene and acrylonitrile as monomers, and adding a small amount of diluent solvent to synthesize styrene-acrylonitrile copolymer. In the technique that bulk polymerization pr...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/44C08F2/01
CPCC08F212/08C08F220/44C08F2/01
Inventor 刘波刘铭孟磊孙一峰韩强乔义涛黎源
Owner WANHUA CHEM GRP CO LTD
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