Acrylonitrile copolymer spinning solution with high molecular weight and narrow distribution and preparation method thereof

A technology of acrylonitrile and copolymer, applied in the field of acrylonitrile copolymer spinning solution and its preparation, can solve the problems of adverse effects on carbon fiber properties, widening of copolymer molecular weight distribution, uneven chain structure, etc., and achieve excellent spinnability. , the effect of narrow molecular weight distribution and widening of the exothermic range
CN101805936AInactive Publication Date: 2010-08-18INST OF CHEM CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF CHEM CHINESE ACAD OF SCI
Publication Date
2010-08-18
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses an acrylonitrile copolymer spinning solution and a preparation method thereof. The spinning solution is a mixed solvent solution of an acrylonitrile copolymer; the acrylonitrile copolymer is formed by polymerization of a first acrylonitrile monomer and a comonomer, and the comonomer comprises unsaturated carboxylic acid monomers; the mass of the first acrylonitrile monomer is 90-99.5% of the total mass of monomers, and the mass of the comonomer is 0.5-10% of the total mass of monomers; the mixed solvent is a mixture comprising dimethyl sulfoxide and at least one of water, alcohol solvents and ketone solvents; and the mass percent concentration of the monomers in the spinning solution is 15-30%. In the invention, the mixed solvent of the dimethyl sulfoxide is adopted in the process of acrylonitrile copolymerization, and the proportion of each solvent is controlled to carry out copolymerization reaction in homogeneous phases; and meanwhile, the second comonomer is continuously replenished in a certain time of reaction to stabilize the instantaneous composition of the acrylonitrile copolymer to obtain the polyacrylonitrile copolymer spinning solution with high molecular weight, narrow molecular weight distribution and uniform chain structure.
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Description

technical field

[0001] The invention relates to a high-molecular-weight, narrow-distribution acrylonitrile copolymer spinning solution and a preparation method thereof. Background technique

[0002] Carbon fiber has the characteristics of high specific strength, high specific modulus, heat resistance, corrosion resistance, fatigue resistance, and creep resistance. It is a high-performance fiber material and has been widely used in aerospace, national defense construction, sports and leisure products, and medical equipment. and construction industries. Polyacrylonitrile-based carbon fiber has outstanding mechanical properties and is a hot spot in carbon fiber research and industrialization in recent years. The key to restricting the development of polyacrylonitrile-based carbon fibers is the quality of polyacrylonitrile precursors, and to obtain high-quality polyacrylonitrile precursors must start from the synthesis of high-quality polyacrylonitrile copolymer spinning soluti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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