| 摘要 |
PURPOSE:To obtain a cloth prepreg improved in toughness, modulus, heat resistance, resistance to water absorption, solvent resistance and burn-through properties by impregnating a reinforcing fiber fabric with a resin composition comprising an epoxy resin, a curing agent and a specified solid rubber in two separate stages. CONSTITUTION:An epoxy resin is mixed with a curing agent, 3-12 pts.wt. solid acrylonitrile/butadiene rubber having functional groups and a lowly crosslinked structure and at most 5 pts.wt. polyether sulfone to obtain a resin composition having a complex viscosity coefficient y0.02 of 5000P or above when measured at a vibration frequency of 0.02Hz at 80 deg.C and satisfying the relationship: logy0.02-logy2>=0.5 (wherein y2 is a complex viscosity coefficient as measured at a vibration frequency of 2Hz at 80 deg.C). A reinforcing fiber fabric is impregnated with this composition in two separate stages under such conditions that the maximum linear pressure of impregnation in the first stage is 1000kg/cm<2> or above, and the resin impregnation rate of the preliminary prepreg is 10-30%, and that the maximum linear pressure of impregnation in the second stage is 1000kg/cm<2> or below, the interstices of the weave are filled, and the coverage factor is 97-99.99%. |
