Spinning method of high molecular weight and high viscosity spinning solution

Abstract

The invention relates to a spinning method of a high-molecular-weight and high-viscosity spinning solution, which mainly solves the technical problems of poor fluidity, poor spinnability, high spinning pressure and high filtration pressure of the high-molecular-weight and high-viscosity spinning solution in the prior art. By adopting a spinning method of high-molecular weight and high-viscosity spinning solution, comprising the following steps: a polyacrylonitrile / dimethyl sulfoxide solution with a molecular weight of 100,000 to 300,000 and a viscosity of 80 Pa·s to 300 Pa·s, through Wet spinning to obtain a polyacrylonitrile precursor, which is characterized as follows: the breaking strength is 5cN / dtex to 8cN / dtex, the CV value of the breaking strength is 4% to 20%; the elongation at break is 8% to 16 %, the CV value of elongation at break is 4% to 20%, which solves this problem well and can be used in the industrial production of polyacrylonitrile-based carbon fiber precursors.

Description

technical field [0001] The invention belongs to a method for preparing polyacrylonitrile precursors for carbon fibers, and in particular relates to a method for wet spinning a spinning solution of high molecular weight and high viscosity polyacrylonitrile / dimethyl sulfoxide. Background technique [0002] Since the 1950s, developed countries have urgently needed new structural materials and corrosion-resistant materials in order to develop large-scale rockets and artificial satellites and comprehensively improve aircraft performance, so that carbon fibers reappeared on the stage of new materials, and gradually formed PAN-based carbon fibers. The three major raw material systems of viscose-based carbon fiber and pitch-based carbon fiber. Because the production process of PAN-based carbon fiber is simpler than other methods, and the mechanical properties of the product are good, it has been developed rapidly and has become the mainstream of the current production of carbon fibe...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the high molecular weight and high viscosity spinning solution in the prior art has poor fiber-forming properties and high fiber breakage rate.