Method for preparing polyacrylonitrile-based carbon fiber precursors without skin-core structure

A technology for spinning polyacrylonitrile-based carbon fibers and polyacrylonitrile is applied in spinning solution preparation, fiber processing, drawing spinning and other directions, which can solve the problems of unfavorable comprehensive performance of precursors, increase of precursor pores, and reduction of production costs. and other problems, to achieve the effect of less defects, increased stretching ratio, and improved production efficiency
CN102154723BInactive Publication Date: 2012-11-07SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Publication Date
2012-11-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preparing polyacrylonitrile-based carbon fiber precursors without a skin-core structure and belongs to the technical field of carbon fiber precursors. The method comprises the followings steps of: evenly mixing water or alcohol compounds and an organic solvent, adding polyacrylonitrile resin in the mixed solution, performing the heated swelling dissolution treatment, and filtering the mixed solution to obtain polyacrylonitrile spinning solution; and ageing the polyacrylonitrile spinning solution, performing spraying and extrusion to obtain primary precursors, and performing water-washing stretching, second-level hot water stretching, drying densification and saturated steam stretching of the primary precursors in sequence to obtain the polyacrylonitrile-based carbon fiber precursors. By the method, the good-quality polyacrylonitrile-based carbon fiber precursors having the advantages of no skin-core structure, less defects, small fiber number and high strength can be mass produced in large scale in the conventional industrialized spinning equipment, and the production cost can be effectively lowered.
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Description

technical field

[0001] The invention relates to a method in the technical field of carbon fiber precursors, in particular to a method for preparing polyacrylonitrile-based carbon fiber precursors without a sheath-core structure. Background technique

[0002] The unique properties of carbon fiber make it widely used in aerospace, sports, construction and other fields. Polyacrylonitrile (PAN)-based carbon fiber is the most widely used carbon fiber with the best development prospects. As the precursor of polyacrylonitrile-based carbon fiber, the quality of polyacrylonitrile precursor largely determines the performance of polyacrylonitrile-based carbon fiber. At present, polyacrylonitrile precursors are usually prepared by wet or dry-wet spinning (Chinese patent CN101165238A, Japanese patent JP11-152618). The raw silks produced by these two traditional spinning methods have obvious differences in skin-core structure, that is, the skin layer is dense and the core layer is loose...

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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