| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyacrylonitrile-based lightweight carbon fiber comparable to conventional general-purpose carbon fiber in performance (strength and elastic modulus) and having low specific gravity and provide a method for the production of the carbon fiber. <P>SOLUTION: The light-weight polyacrylonitrile-based carbon fiber has a strand strength of 3,900-5,000 MPa, an elastic modulus of 225-235 GPa and a specific gravity of ≥1.63 and <1.69. The light-weight polyacrylonitrile-based carbon fiber is produced by spinning a copolymer obtained by polymerizing a monomer containing ≥94 mass% acrylonitrile, applying a specific amount of a finish comprising an emulsion aqueous solution containing an amino-modified silicone and a dialkyl sulfosuccinate to the produced yarn, drying and densifying the product under a specific condition, converting the product to a precursor fiber for carbon fiber by wet-heat drawing treatment, heat-treating the resultant precursor fiber for carbon fiber under a specific condition to obtain a flame-resistant fiber, carbonizing the fiber in an inert atmosphere under a specific condition and further carbonizing the product in an inert atmosphere. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
