POLYACRYLONITRILE-BASED OXIDIZED FIBER NONWOVEN FABRIC AND CARBON FIBER NONWOVEN FABRIC AND METHOD FOR PRODUCING CARBON FIBER NONWOVEN FABRIC

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a polyacrylonitrile (PAN)-based carbon fiber nonwoven fabric as a useful raw material for a carbon fiber material such as an electrode material for a polymer fuel cell, and to provide a method for producing a PAN-based oxidized fiber nonwoven fabric of an intermediate material for the carbon fiber nonwoven fabric.;SOLUTION: The PAN-based oxidized fiber nonwoven fabric is produced by processing an oxidized fiber having a specific gravity of S₁ and an oxidized fiber having a specific gravity of S₂ to obtain a nonwoven fabric, wherein the specific gravity S₁ and the specific gravity S₂ satisfy relations 1.25≤S₁≤0.50×S₂+0.64 and 1.35≤S₂≤1.42 and the oxidized fiber nonwoven fabric is carbonized to produce a PAN-based carbon fiber nonwoven fabric having 10-140 g/m² basis weight and ≤3.5 mΩ electrical resistance.;COPYRIGHT: (C)2003,JPO