Title:
PRODUCTION METHOD OF CARBON FIBER BUNDLE
Document Type and Number:
Japanese Patent JP2021139062
Kind Code:
A
Abstract:
To obtain a dense and high-quality coagulated fiber bundle while suppressing generation of gel in a spinning solution, and then to stably obtain a high-quality carbon fiber bundle.SOLUTION: There is provided a production method of a carbon fiber bundle, comprising: coagulating a spinning solution containing an acrylonitrile-based copolymer obtained by co-polymerizing 85 mol% or more of acrylonitrile and 0.05 mol% or more of a co-polymerizing component having a carboxyl group in a coagulation bath solution to obtain a coagulated fiber bundle by using a dry-wet spinning method or wet spinning method; and then performing at least a washing step, a drawing step, an oiling agent applying step and a drying step to obtain a carbon fiber precursor fiber bundle; and performing a flameproofing process in which the carbon fiber precursor fiber bundle is flame-proofed in an oxidizing atmosphere at a temperature of 200 to 300°C, a pre-carbonization process for pre-carbonization in an inert atmosphere with a maximum temperature of 500 to 1200°C, and a carbonization process for carbonization in an inert atmosphere with a maximum temperature of 1200 to 2000°C, in which the coagulation bath solution contains: at least one organic solvent selected from the group consisting of dimethyl sulfoxide, dimethylformamide and dimethylacetamide; water; and a base, a concentration of the organic solvent in the coagulation bath solution is 60 to 85%, and a value of pH of the coagulation bath solution is 8 or larger.SELECTED DRAWING: None
Inventors:
HORINOUCHI AYANOBU
WATANABE FUMIYOSHI
OKISHIMA YUKI
WATANABE FUMIYOSHI
OKISHIMA YUKI
Application Number:
JP2020036540A
Publication Date:
September 16, 2021
Filing Date:
March 04, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
D01F9/22; D01F6/18