Resin composition for fiber-reinforced composite materials and fiber-reinforced composite material using same

A method for manufacturing a molded body comprising the steps of:

• preparing a base material that includes an epoxy resin (A) including 75% by mass to 100% by mass of a bisphenol A epoxy resin and a (meth)acrylate compound (B) having three or more (meth)acryloyl groups in a molecule, and a curing agent including an amine compound (C) represented by the following general formula (1)
• X—(CH2NH2)n (1)
• wherein X represents an n-valent organic group having 1 to 16 carbon atoms;
• and n represents 2 or 3, and
• a curing catalyst that is at least one selected from phenol, hydroquinone, methylhydroquinone, dimethylhydroquinone, trimethylhydroquinone, tetramethylhydroquinone, isopropylhydroquinone, methyl-isopropylhydroquinone, mono-t-butylhydroquinone, mono-t-amylhydroquinone, nitrohydroquinone, phenylhydroquinone, chlorohydroquinone, dichlorohydroquinone, bromohydroquinone, catechol, t-butyl catechol, resorcinol, pyrogallol, dinitropyrogallol, and 1,2,4-benzenetriol;
• heating the base material to 50° C. to 90° C., heating the curing agent and curing catalyst to 20° C. to 60° C., and mixing the base material, the curing agent, and the curing catalyst such that the mass ratio of the base material and the curing agent is within the range of from 85:15 to 65:35;
• blending reinforcing fibers therein to obtain a fiber-reinforced composite material;
• and
• thermally curing and molding the fiber-reinforced composite material in a die.