The vapor absorption capacity with of temperature 293K and the humidity 90 which are measured by the gas absorption capacity

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a precursor fiber for producing a carbon fiber having high strength and high elongation.;SOLUTION: There is provided a method for producing a precursor fiber for producing a carbon fiber that has a vapor absorption amount of 3-9 cm³/g at 90% humidity measured by a gas adsorption measuring apparatus using water vapor, in which an acrylic fiber that is obtained by spinning a copolymer obtained by copolymerizing monomers containing 90 mass% or more of acrylonitrile is water washed, dried, and steam drawn, and then heat treated in a floating state in the air at 170-250°C at a stretch ratio of 0.90-1.10.;COPYRIGHT: (C)2013,JPO&INPIT