A kind of polyacrylonitrile-based carbon fiber spinning solution and preparation method thereof

Abstract

The invention provides a polyacrylonitrile-based carbon fiber spinning solution and a preparing method of the polyacrylonitrile-based carbon fiber spinning solution. The spinning solution is prepared from monomers, radical initiators and solvent reaction liquid through copolymerization; the mass concentration of the monomers in the reaction liquid is 15 to 35 percent; the radical initiators account for 0.2 to 1 percent of the monomer total weight; the balance is the solvent; the monomers comprise acrylonitrile monomers accounting for 95 to 99.5 percent of the total mass of the monomers and copolymer monomers accounting for 0.5 to 5 percent of the total mass of the monomers; the copolymers are hydrophilic copolymer monomers containing 2-methylene butyric acid groups. The preparing method comprises the following steps that (1) the raw materials are proportionality added into a reaction kettle, are stirred and mixed, and are subjected to nitrogen bubbling for 10 to 40 minutes; (4) under the nitrogen protection, the reaction is taken at the constant temperature being 50 to 70 DEG C for 6 to 36h; (3) residue monomers and bubbles are removed to obtain the spinning solution. The designed copolymer monomers can improve densification agents of resin hydrophilia and can also improve the oxygen permeability and the spinnability. The spinning solution obtained by the method has high hydrophilicity and good heat release performance.

Description

technical field [0001] The invention relates to a carbon fiber spinning liquid and a preparation method thereof, in particular to a polyacrylonitrile-based carbon fiber spinning liquid and a preparation method thereof. Background technique [0002] As a new type of structural material, carbon fiber has high specific strength, high specific modulus, heat resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, noise reduction, etc. It is widely used in cutting-edge fields such as aerospace, national defense and military, as well as civilian purposes such as advanced sporting goods and medical equipment. There are many precursors for preparing carbon fibers, but so far, only polyacrylonitrile, viscose and pitch have been produced on an industrial scale, and the production of polyacrylonitrile-based carbon fibers accounts for more than 90%. [0003] ...

AI Technical Summary

Problems solved by technology

However, the reactivity ratios of the above two monomers and acrylonitrile are very different, and it is difficult to obtain an acrylonitrile copolymer with a uniform chain structure.

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