A kind of preparation method of polyacrylonitrile base carbon fiber

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile resin, which is applied in the direction of spinning solution preparation, fiber chemical characteristics, wet spinning method, etc., can solve the problems of raw silk purification and mechanical performance deterioration, and achieve good purification effect, The effect of improving mechanical properties
CN102953153BActive Publication Date: 2016-01-20CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2016-01-20

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Abstract

The invention provides a preparation method for a polyacrylonitrile-based carbon fiber. The third monomer of a spinning raw material of a carbon fiber protofilament, i.e., polyacrylonitrile resin, is itaconic acid; a spinning solution is prepared from the resin by using an aqueous solution of NaSCN, and spinning and solidification are carried out so as to prepare a nascent fiber. The nascent fiber successively undergoes the following procedures: water bath drafting in the aqueous solution of NaSCN; drip washing with deionized water; dipping in a buffer solution containing acid A and salt B, wherein A is sulfuric acid, hydrochloric acid or nitric acid, and B is a sodium salt or a sylvite of A; water bath drafting in pure water; and hot bath rinsing with deionized water until rinsing liquid is neutral and sodium or potassium ions cannot be measured, and continued rinsing for 5 to 15 min. The carbon fiber protofilament is prepared by subjecting the nascent fiber to post-processing procedures like oiling and dry densification. The protofilament undergoes pre-oxidation in an aerobic atmosphere under the condition of drafting and then undergoes carbonization in an anoxic atmosphere under the condition of drafting so as to obtain a finished product of the polyacrylonitrile-based carbon fiber.
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Description

technical field

[0001] The invention relates to a method for manufacturing polyacrylonitrile-based carbon fibers. The polyacrylonitrile resin used as the raw material for the preparation of carbon fiber precursors uses itacrylic acid as the third comonomer, and the precursors are prepared through a wet spinning process. Background technique

[0002] Carbon fiber has excellent mechanical properties, and its extremely high specific strength and specific modulus are incomparable to other materials. As a reinforcing material, it is widely used in the fields of aerospace, aircraft and sports equipment manufacturing. Carbon fibers are usually made from pre-oxidized and carbonized precursors made of carbonizable substances. Because polyacrylonitrile resins have a high carbonization yield, polyacrylonitrile fibers are very ideal carbon fiber precursors. The prepared carbon fibers It is called polyacrylonitrile-based carbon fiber.

[0003] In order to obtain polyacrylonitrile-based ...

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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