Polyacrylonitrile precursor and polymerization reaction kettle serving as production equipment thereof

Abstract

The invention relates to a polyacrylonitrile precursor and a polymerization reaction kettle serving as production equipment thereof. The formula of the polyacrylonitrile precursor mainly comprises monomers AN, MA and IA, dimethylsulfoxide (DMSO) serving as a solvent, and azodiisobutyronitrile (AIBN) serving as an initiator; and if the total content of the mixed liquid of AN, MA and IA is 1, the content of the DMSO is 30-50% by weight, and the content of the AIBN is 6.5-9.5% by weight. The reaction kettle serving as the production equipment of polyacrylonitrile precursor provided by the invention comprises a kettle body and a kettle cover, wherein the kettle body and the kettle cover are connected through a flange; stirrers are arranged in the kettle body; a liquid inlet and a liquid outlet are arranged on the kettle cover; each stirrer is a ribbon stirrer; and two or more ribbon stirrers are arranged. The invention has the advantages that the conversion rate is obviously improved, the monomer recovery is easy, and fiber with a dense structure is easily obtained in spinning, thereby being beneficial to the improvement of the soft scientific performance of the finally obtained fiber; and moreover, the problems of non-uniform stirring, easy coking, low conversion rate, unstable reaction and the like in the production of the polyacrylonitrile precursor can be effectively solved.

Description

technical field [0001] The invention relates to a raw material for the textile industry, specifically a polyacrylonitrile precursor, and also relates to a polymerization reactor for its production equipment. Background technique [0002] The most traditional and currently most commonly used polymerization method for PAN precursor is solution polymerization. The main raw materials are acrylonitrile (AN), methyl acrylate (MA), itaconic acid (IA), and the solvent is dimethyl sulfoxide (DMSO). The different initiators and the concentration and proportion of each raw material have a great influence on the polymerization reaction, mainly in the conversion rate, average molecular weight, reaction time and spinning performance. For this reason, people have done a lot of research and experiments, but there is still no ideal solution. results; and in the production equipment, especially the reactor, the volume of the reactor is generally 2-3m 3 In order to expand the production scale...

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Problems solved by technology

[0002] The most traditional and currently most commonly used polymerization method for PAN precursor is solution polymerization. The main raw materials are acrylonitrile (AN), methyl acrylate (MA), itaconic acid (IA), and the solvent is dimethyl sulfoxide (DMSO). The different initiators and the concentration and proportion of each raw material have a great influence on the polymerization reaction, mainly in the conversion rate, average molecular weight, reaction time and spinning performance. For this reason, people have done a lot of research and experiments, but there is still no ideal solution. results; and in the production equipment, especially the reactor, the volume of the reactor is generally 2-3m 3 In order to expand the production scale and stabilize the product quality, the volume of the reactor must be enlarged. However, with the increase of the volume of the reactor, there will be many problems, such as uneven stirring, coking, lower conversion rate, unstable reaction, Violence caused by poor heat conduction, etc., and such problems also exist in small-volume reactors

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