| 摘要 |
<p>The invention relates to (I) an epoxy resin composition for fiber-reinforced composite material which comprises as the essential components (1) an epoxy resin liquid at room temperature, (2) an aromatic polyamine liquid at room temperature, and (3) diaminodiphenyl sulfone; (II) an epoxy resin composition for fiber-reinforced composite material which comprises at least (4) an at least trifunctional aromatic epoxy resin, (5) an aromatic epoxy resin having a number of epoxy groups of 2 or above but below 3, and (6) an aromatic polyamine, gives a cured resin having a theoretical molecular weight between crosslinks of 250 to 350 g/mol, and exhibits an initial viscosity of 1 to 500 mPa/s at 80 °C; and (III) an epoxy resin composition for fiber-reinforced composite material which comprises (7) a polyglycidyl ether of a phenol-aralkyl resin and (8) a polyamine. The invention provides liquid epoxy resin compositions which exhibit low viscosities at relatively low temperatures and give cured resins having excellent performances such as little drop by water absorption in glass transition temperature.</p> |
