Sizing agent for carbon fiber, aqueous dispersion of the same, carbon fiber treated by sizing, sheet comprising the carbon fiber, and carbon fiber-reinforced composite material

摘要: A sizing agent for carbon fiber comprising either a component (A) and (B), or alternatively, (A'), (B') (D), each of which is described below. Component (A): an epoxy compound with at least 1 group within molecule, surface energy 17 to 34 mJ/m 2 ; (B): 35 (A'): groups (B'): (D): anionic surfactant aryloxy as hydrophobic group, ammonium ion counter ion, alkylene oxide addition quantity no more than 10 moles.