Preparation method of precursor fibers for wet-process spinning PAN-based carbon fibers

Abstract

The invention discloses a preparation method of precursor fibers for wet-process spinning PAN-based carbon fibers. The preparation method comprises the following steps: (1) preparation of a polyacrylonitrile raw solution; (A) dissolving raw materials; (B) carrying out polymerization reaction; (C) obtaining the polyacrylonitrile raw solution; and (2) a spinning process: carrying out a condensation and molding process, a water washing process, an oil applying process, a drying and densifying process, a high-pressure steam drafting process, secondary oil application and a loosening hot molding process on the prepared polyacrylonitrile raw solution to obtain the precursor fibers. The residual amount and gel of the raw solution prepared by the method are less and the hydrophily is great; primary fibers obtained by the raw solution in a spinning and condensation molding process are dense and have high transparency, so that the operation in a spinning process is stable when the spinning speed is increased to be more than 125m/min; the solvent residual amount of the precursor fibers is small, and no broken fibers and parallel fibers are formed; the single-path yield is greatly improved and the production cost of the precursor fibers is greatly reduced; and under a high-speed spinning condition, a production process of T700-grade and T800-grade precursor fibers is met.

Description

technical field [0001] The invention relates to the field of nano-carbon fiber preparation, in particular to a method for preparing raw silk for wet spinning PAN-based carbon fiber. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber has excellent characteristics such as high temperature resistance, corrosion resistance, small thermal expansion coefficient, good dimensional stability, high specific strength, high specific modulus and light weight, and is widely used in aerospace, rail transit, sports Supplies and other aspects have been widely used. At present, my country's carbon fiber has broken through the technical bottleneck of T700 and T800, and T300 has been able to produce stably on a large scale. The sales space is squeezed, the price loses its competitive advantage, the market share is low, capital recovery is difficult, and it is basically in a state of loss. [0003] According to public reports and statistics, there are about 40 domestic car...

AI Technical Summary

Problems solved by technology

At present, my country's carbon fiber has broken through the technical bottleneck of T700 and T800, and T300 has been able to produce stably on a large scale. Squeezed in sales space, lost competitive advantage in price, low market share, difficult capital recovery, basically in a state of loss

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