SIZING AGENT FOR CARBON FIBER, SIZING AGENT SOLUTION FOR CARBON FIBER, CARBON FIBER SHEETLIKE MATERIAL USING THE CARBON FIBER AND CARBON FIBER-REINFORCED RESIN COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain a sizing agent for a carbon fiber having excellent affinity for a matrix resin, suitable for a carbon fiber reinforced resin composition by preparing a water-based dispersion containing a cycloaliphatic epoxy composition containing a specific functional group.;SOLUTION: A water-based dispersion comprising 40 wt.% of a sizing agent containing a compound having a functional group of the formula (R is H or an alkyl) and a cycloaliphatic epoxy group and a nonionic surfactant in the weight ratio of 95/5-70/30, preferably 85/15-75/25 is prepared. A carbon fiber provided with 0.1-5.0 wt.%, preferably 0.2-3.0 wt.% pickup of the sizing agent is used to form a sheetlike material, which is used to give a carbon fiber-reinforced resin composition.;COPYRIGHT: (C)2000,JPO