| 摘要 |
PURPOSE:To obtain a sizing agent capable of improving both the coherence and wear resistance of carbon fiber by incorporating the essential components, i.e. a specific epoxy resin and emulsifier, with component(s) capable of enhancing the impregnability for the matrix resin. CONSTITUTION:The objective sizing agent can be obtained by incorporating the essential components, i.e. (A) a bisphenol A- or bisphenol F-type epoxy resin >=30 poise in viscosity at 25 deg.C and (B) an emulsifier i.e. ethylene oxide adduct of unsaturated fatty acid glyceride or polyethylene oxide styrylphenyl ether, with at least one substance selected from (C) long chain aliphatic epoxy resins, (D) cyclic aliphatic epoxy resins <=50 poise in viscosity at 25 deg.C, (E) 2- oxazoline derivatives, and (F) alkylene oxide adducts of dimethacrylic acid or acrylic acid of formula I [R1 is H or CH3; R2 is (CH2)2-3; R3 is R2 or of formula II]. In particular, it is preferable that the sizing agent freed from the water contained be <=1wt.% and <=5wt.% at 150 deg.C and 200 deg.C, respectively, in the heating loss at a temperature rising rate of 10 deg.C/min. |
