RESIN COMPOSITIONS FOR FIBER-REINFORCED COMPOSITE MATERIALS AND PROCESSES FOR PRODUCING THE SAME, PREPREGS, FIBER-REINFORCED COMPOSITE MATERIALS, AND HONEYCOMB STRUCTURES

摘要

The present invention provides a prepreg excellent in self adhesiveness to a honeycomb core, low in porosity when used as skin panels, excellent in surface smoothness (low in surface porosity) when used as skin panels, and good in tackiness and drapability, and also provides a honeycomb sandwich panel high in skin panel peel strength and excellent in impact resistance and hot water resistance, and a resin composition for a fiber reinforced composite material to allow the above. The present invention has the following constitution. A resin composition for a fiber reinforced composite material comprising the components ÄAÜ, ÄBÜ and ÄCÜ are essential wherein the modulus of storage rigidity G' measured by parallel plates having vibration frequency of 0.5 Hz during elevation of temperature from 50 DEG C at 1.5 DEG C/min is in a range of 5 to 200 Pa in an entire range of 70 DEG C to 100 DEG C. A resin composition for a fiber reinforced composite material comprising the components ÄAÜ , ÄBÜ and ÄCÜ are essential, wherein the minimum modulus of storage rigidity G'min and the maximum modulus of storage rigidity G'max at 70 DEG C to 100 DEG C measured by parallel plates having vibration frequency of 0.5 Hz during elevation of temperature from 50 DEG C at 1.5 DEG C/min, satisfy the following relation: MATH A resin composition for a fiber reinforced composite material comprising the components ÄAÜ, ÄBÜ and ÄCÜ are essential, wherein the thixotropy index is in a range of 2.5 to 40, the resin viscosity at 80 DEG C measured by parallel plates having vibration frequency of 0.5 Hz during elevation of temperature from 50 DEG C at 1.5 DEG C/min is in a range of 100 to 1000 poises, and the minimum value of resin viscosity during heating is 30 to 400 poises. A resin composition for a fiber reinforced composite material comprising the components ÄAÜ, ÄBÜ and ÄCÜ are essential, wherein solid rubber and fine silica particles are contained as component ÄCÜ by 1 to 10 wt%, respectively, based on the total weight of the resin composition. The fiber reinforced composite material using the prepreg of the present invention can be used widely for airplanes, automobiles and other industrial applications, particularly as structural materials of airplanes, because of its excellent mechanical properties.