Polymerization process of random styrene-cis-butenedioic anhydride copolymer

A technology of random copolymer and polymerization method, which is applied in the field of polymerization of styrene-maleic anhydride random copolymer, can solve the problems of low maleic anhydride content and high molecular weight dispersion index, and achieve convenient operation, simple process flow and process control easy effect

Inactive Publication Date: 2005-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this invention is to overcome the problem that the maleic anhydride content in the styrene-maleic anhydride copolymer obtained by polymerization is low or the molecular weight dispersion index is high when the maleic anhydride content is high in the prior art, and a new styrene-maleic anhydride copolymer is provided. Polymerization method of random copolymer of maleic anhydride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First put 1875 grams of styrene and 125 grams of n-butyl acrylate (BA) into a 10-liter reactor with a ribbon stirrer, heat up to 110 ° C, and then add 1875 grams of styrene, 300 grams of maleic anhydride and 125 grams of The solution that n-butyl acrylate is made into is added reactor equably with the flow rate of 675 grams / hour, and after solution feeding finishes, add the reaction terminator hydroquinone of 50 milliliters of 1% (weight) concentration to finish reaction, carry out volatilization then After separation and extrusion, cooling, pelletizing and other post-treatments, uniform and transparent copolymer particles were obtained. After analysis and determination, the content of maleic anhydride in the obtained copolymer was 21.0% (mole), the molecular weight was 230,000 (weight average), and the molecular weight The dispersion index was 2.7.

Embodiment 2

[0018] Put 3750 grams of styrene and 250 grams of n-butyl acrylate into a 10-liter reactor with a ribbon stirrer, heat up to 110 ° C, and then add 3750 grams of styrene, 750 grams of maleic anhydride and 250 grams of n-butyl acrylate The solution made of ester is evenly added to the reactor at a flow rate of 1350 g / hour. After the solution is fed, the polymerization liquid in the reactor is drawn out for devolatilization and separation, extrusion, cooling, pelletizing and other post-treatments to obtain a uniform 1. Transparent copolymer particles. Through analysis and determination, the maleic anhydride content in the obtained copolymer is 26.0% (mole), the molecular weight is 230,000 (weight average), and the molecular weight dispersion index is 2.7.

Embodiment 3～12

[0024] Example number

[0025] Note: AN is acrylonitrile, BA is n-butyl acrylate, and MMA is methyl methacrylate.

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Abstract

The present invention relates to polymerization process of random styrene-cis-butenedioic anhydride copolymer and aims at producing random styrene-cis-butenedioic anhydride copolymer with relatively high cis-butenedioic anhydride content and lower molecular weight dispersion index. Cis-butenedioic anhydride is first dissolved in the solution compounded with partial styrene and partial low activity monomer, and the rest of the styrene and the rest of the low activity monomer are added for reaction. The low activity monomer is at least one selected from acrylonitrile, methyl acrylate, ethyl acrylate, n-butyl acrylate and methyl methacrylate. The present invention may be used in the industrial production of random styrene-cis-butenedioic anhydride copolymer.

Description

technical field [0001] The invention relates to a polymerization method of a styrene-maleic anhydride random copolymer, in particular to a polymerization method of a styrene-maleic anhydride random copolymer with a high maleic anhydride content and a low molecular weight dispersion index. Background technique [0002] In polymer products, the styrene-maleic anhydride alternating copolymer with a molar ratio close to 1:1 cannot be used as a thermoplastic material because of its easy water absorption and difficulty in molding. Styrene-maleic anhydride random copolymer (R-SMA) whose molar content of maleic anhydride is less than 30% is an easy-to-process functional thermoplastic polymer material. With the difference of maleic anhydride (MAH) content in the copolymer, the performance and application of the copolymer are also different, especially as the maleic anhydride content in the copolymer increases, the performance and application of the copolyme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00C08F212/08
Inventor 王巍石正金王荣伟周文乐
Owner CHINA PETROLEUM & CHEM CORP
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