Ternary copolymerization highly hydrophilic polyacrylonitrile-based carbon fiber spinning solution and preparation method thereof

Abstract

The invention relates to ternary copolymerization highly hydrophilic polyacrylonitrile-based carbon fiber spinning solution, which consists of the following raw materials: acrylonitrile serving as a main monomer, a comonomer 1, a comonomer 2, azodiisobutyronitrile serving as an initiator, and an organic solvent, wherein the weight ratio of the main monomer to the comonomer 1 to the comonomer 2 is(90.0-99.5):(0.45-5.0):(0.05-5.0); the using amount of the azodiisobutyronitrile serving as the initiator is 0.3 to 2.0 percent based on the total weight of the monomers; and the monomers account for10 to 25 mass percent of the solution. The invention has the advantages that: the spinning solution has low cost and high hydrophilicity, and the reaction is easy to control.

Description

technical field [0001] The invention relates to a carbon fiber spinning solution and a preparation method, in particular to a ternary copolymerization highly hydrophilic polyacrylonitrile-based carbon fiber spinning solution and a preparation method. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber has low density, high specific strength, high specific modulus, fatigue resistance, high temperature resistance, wear resistance, creep resistance, electrical conductivity, thermal conductivity, small thermal expansion coefficient, electromagnetic shielding, vibration attenuation Therefore, it can be used not only as structural material, but also as ablation material and functional material to meet the needs of different fields such as aerospace, national defense construction, sports and leisure products, medical equipment and construction. application requirements. The key step in the preparation of high-performance polyacrylonitrile carbon fiber is the p...

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Problems solved by technology

[0003] At present, in China, acrylonitrile-itaconic acid binary copolymerization or acrylonitrile-itaconic acid-methyl acrylate ternary copolymerization polyacrylonitrile resin is mostly used as the precursor of polyacrylonitrile-based carbon fibers. This system is gradually exposed during use. These defects are not conducive to spinning high-performance polyacrylonitrile precursors and obtaining homogenized pre-oxidized yarns, which limit the strength of the obtained carbon fibers. Further improve

In recent years, people have been studying ways to improve and increase the hydrophilicity of polyacrylonitrile resins, such as Chemical Science and Technology, 2003, 11(4): 1-3 and Polymer Materials Science and Engineering, 2005, 21(2): 132 -134, ammonium itaconate and acrylamide were used as comonomers to improve the hydrophilic properties of the polymer, but the segregation ratios of these two monomers and acrylonitrile are quite different, and it is not suitable to prepare acrylonitrile copolymers with uniform chain structure Chinese patent CN101148489A discloses a highly hydrophilic polyacrylonitrile-based spinning stock solution containing vinylimidazolium salt structural units, but vinylimidazolium salt belongs to ionic liquid, and the preparation cost is relatively high, so it is not suitable for large-scale industrial production

Chinese patents CN1164811C and CN1231616C use polymerization to carry out ammoniation to convert carboxyl groups into ammonia salts. Although the hydrophilicity of polyacrylonitrile resins can be effectively improved, the reaction between ammonia gas and polyacrylonitrile viscous liquid is a complex multiphase reaction , mass transfer is difficult, the reaction is not easy to control, and the reproducibility is poor

The present invention is based on the premise of binary copolymerization of acrylonitrile-itaconic acid, adding a third component to prepare a method for spinning solution of ternary copolymerization highly hydrophilic polyacrylonitrile-based carbon fiber, which has not yet been reported in the literature

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