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 a component (B), or alternatively, a component (A'), a component (B') and a component (D), each of which is described below. Component (A): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of 17 to 34 mJ/m²; component (B): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of at least 35 mJ/m²; component (A'): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of 17 to 34 mJ/m²; component (B'): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of at least 35 mJ/m²; and component (D): an anionic surfactant with an aryloxy group as a hydrophobic group, with an ammonium ion as a counter ion, and with an alkylene oxide addition quantity of no more than 10 moles.