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Method for preparing polyacrylonitrile resin for carbon fiber by adopting aqueous phase precipitation continuous polymerization process

A technology of polyacrylonitrile resin and polymerization process, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc. It can solve problems such as production efficiency decline, product quality impact, production difficulties, etc., and achieve uniform temperature field, perfect particle structure, and fluidity. Good results

Active Publication Date: 2021-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lower total monomer feed concentration and lower initiator concentration not only reduce the production efficiency, but also bring difficulties to the production of subsequent processes such as processing residual orders, and ultimately affect product quality

Method used

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  • Method for preparing polyacrylonitrile resin for carbon fiber by adopting aqueous phase precipitation continuous polymerization process
  • Method for preparing polyacrylonitrile resin for carbon fiber by adopting aqueous phase precipitation continuous polymerization process
  • Method for preparing polyacrylonitrile resin for carbon fiber by adopting aqueous phase precipitation continuous polymerization process

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Embodiment 1～10

[0028] Acrylonitrile is used as the first comonomer, the second and third comonomers are methyl acrylate and itaconic acid respectively, the weight ratio of acrylonitrile, methyl acrylate and itaconic acid is 96:3:1, and the oxidizing agent It is sodium chlorate, and the reducing agent is sodium metabisulfite. Based on the total polymerization feed monomers, the amount of initiator was 0.32wt%, and the reaction temperature was controlled at 53°C for copolymerization reaction. The concentration of total feed monomers and polymerization reaction time are shown in Table 1. The pure water in the polymerization reactor is fed in three ways. The amount of pure water in the bottom channel makes the total polymerization feed monomer concentration reach the control range, the amount of pure water in the mixing zone 9 makes the solid content of the material in the mixing zone 9 reach 20%, and the amount of pure water in the discharge zone 8 makes the solid content of the material in thi...

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Abstract

The invention discloses a method for preparing polyacrylonitrile resin for carbon fiber by adopting an aqueous phase precipitation continuous polymerization process. In the method, acrylonitrile, the second comonomer and the third comonomer are used as the polymerized monomers, the initiator is a mixture formed by an oxidizing agent and a reducing agent, and the polymerization reaction is carried out at a temperature of 50-56 °C, and the total residence time of the polymerization reaction is 75-120 minutes; obtaining 2-10 μm polyacrylonitrile resin for carbon fiber; wherein: based on the total material added, the feed concentration of the total polymerization monomer is 31-40 wt %. The polymerization reaction temperature of the present invention is stable, and the obtained polyacrylonitrile particles have a small particle size), which can be uniformly dissolved by using an inorganic solvent to obtain a homogeneous, stable composition and high solid content PAN spinning stock solution, thereby meeting the preparation requirements of carbon fiber precursors .

Description

technical field [0001] The invention relates to the technical field of textile chemicals, in particular to a method for preparing polyacrylonitrile resin for carbon fiber by adopting an aqueous phase precipitation continuous polymerization process. Background technique [0002] Carbon fiber is widely used in industry, aerospace, sports and leisure and other fields because of its excellent mechanical properties and chemical stability such as high strength, high modulus, and low density. In the production process of carbon fiber, the performance of the precursor is the main factor restricting the performance of carbon fiber. Spinning with high-average molecular weight polyacrylonitrile resin is an effective way to produce high-strength polyacrylonitrile precursors. However, the polyacrylonitrile resin used to make carbon fibers, from the perspective of chain structure, the high stereoregularity of high molecular weight polyacrylonitrile macromolecular chains makes it difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/44C08F220/14C08F222/02C08F2/16C08F6/00C08F2/38D01F9/22
Inventor 顾文兰宋文迪冯林明
Owner CHINA PETROLEUM & CHEM CORP
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