A kind of preparation method of ternary polyacrylonitrile copolymer for carbon fiber precursor

A technology of carbon fiber precursors and polyacrylonitrile, which is applied in the field of preparation of ternary polyacrylonitrile copolymers for carbon fiber precursors. It can solve the problems of inability to obtain high-performance carbon fibers and difficult control, and achieve easy control of exothermic reactions and reduce flexibility. , performance and the effect of carbonization yield improvement
CN104693348BInactive Publication Date: 2016-09-07DONGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGHUA UNIV
Publication Date
2016-09-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing a ternary polyacrylonitrile copolymer applicable to a carbon fiber precursor; the method comprises the steps: under the protection of nitrogen gas, mixing acrylonitrile, itaconic acid, dispersant and water and heating to 60-75 DEG C; dropwise adding initiator aqueous solution and acrylamide aqueous solution in sequence; after dropwise adding, timing and reacting for 3-24h, washing, denitrifying, filtering, drying and obtaining the ternary polyacrylonitrile copolymer. A water-phase suspension polymerization process is adopted to polymerization; the polymerization heat is easy to be removed and the polymerization temperature is easily controlled; the average molecular weight of the ternary polyacrylonitrile copolymer is higher and the molecular weight distribution is narrow; the prepared ternary polyacrylonitrile copolymer is capable of effectively improving thermal stability performance at a high-temperature pre-oxidation stage and has certain actual application prospects.
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Description

Technical field

[0001] The invention belongs to the field of preparing copolymers for carbon fiber precursors, and particularly relates to a method for preparing a ternary polyacrylonitrile copolymer for carbon fiber precursors. Background technique

[0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, electrical conductivity, shock absorption, heat transfer, radiation resistance and small specific gravity. It is widely used in aerospace, military defense, and environmental protection. , Medical equipment and sporting goods industries.

[0003] The macromolecular chain structure of homopolyacrylonitrile is relatively regular, and the crystallinity is high. When pre-oxidized and cyclized, it reacts with a free radical mechanism, which is difficult to control and cannot obtain carbon fibers with good performance. When preparing the polyacrylonitrile-base...

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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