| 摘要 |
PURPOSE:To obtain a carbon fiber for excellent composite materials with prevented fretting fluff or yarn breakage from occurring in high-order processing, such as prepreg formation or drum winding, by applying a specific sizing agent to the carbon fiber. CONSTITUTION:At least one kind of compound selected from compounds expressed by formulas I, II and III (R1 is H, OR, formula IV or V: R2 is H or OH; m and n are 1-49 and m+n is 10-50) as a sizing agent in an amount of 0.1-5.0wt.%, preferably 0.3-3.0wt.% is applied to a carbon fiber to afford the aimed carbon fiber having a low friction coefficient with metal and excellent coherency. Effects on maintenance of compatibility and reduction in friction coefficient are more increased by copolymerizing polyethylene oxide or/and polypropylene oxide components for imparting smoothness to the fiber and reducing the friction coefficient with bisphenol A component for improving compatibility with a matrix resin and using the resultant copolymer than by mixing simple components and using the obtained mixture. |
