초록 ▼

A method for producing a fiber-reinforced composite material plate by heating and pressurizing a prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120° C. and a molding pressure of at least 10 kg/cm2. The prepreg is prepared from a reinforcing fiber and an epoxy

A method for producing a fiber-reinforced composite material plate by heating and pressurizing a prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120° C. and a molding pressure of at least 10 kg/cm2. The prepreg is prepared from a reinforcing fiber and an epoxy resin composition. The epoxy resin composition features: an epoxy resin; an amine compound having at least one sulfur atom in the molecule thereof and/or a reaction product of the epoxy resin and the amine compound having at least one sulfur atom in the molecule thereof; a urea compound; and a dicyandiamide. The contents of the sulfur atom and the urea compound in the epoxy resin composition are respectively 0.2 to 7% by mass and 1 to 15% by mass.

대표청구항 ▼

The invention claimed is: 1. A method for producing a fiber-reinforced composite material plate, comprising: preparing a prepreg comprising a reinforced fiber and an epoxy resin composition; and heating and pressurizing the prepreg for a molding time of 15 minutes or less, at a molding temperature

The invention claimed is: 1. A method for producing a fiber-reinforced composite material plate, comprising: preparing a prepreg comprising a reinforced fiber and an epoxy resin composition; and heating and pressurizing the prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120° C. and a molding pressure of at least 10 kg/cm2, to mold the prepreg into the fiber-reinforced composite material plate; wherein the epoxy resin composition, comprises: a component A; a component B; a component C; and a component D; wherein: a content of a sulfur atom in the composition is from 0.2 to 7% by mass; a content of component C in the composition is from 1 to 15% by mass; the component A comprises an epoxy resin; the component B comprises an amine compound having at least one sulfur atom in a molecule thereof (component B-1) and/or a reaction product of the epoxy resin and the amine compound having at least one sulfur atom in the molecule thereof (component B-2); the component C comprises a urea compound; and the component D comprises a dicyandiamide. 2. The method according to claim 1, wherein the component A comprises at least one epoxy resin selected from the group consisting of a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a bisphenol S type epoxy resin, a phenol novolac type epoxy resin, and a cresol novolac type epoxy resin. 3. The method according to claim 1, wherein a Gel time of the epoxy resin composition at 130° C. is equal to or less than 200 seconds. 4. The method according to claim 1, 2 or 3, wherein the component C comprises particles having an average particle diameter equal to or less than 150 μm. 5. The method according to claim 1, wherein the epoxy resin composition is obtained by: mixing component A and component B-1; and further mixing component C and component D with component A and component B-1to obtain the epoxy resin composition. 6. The method according to claim 5, wherein, when the resin composition is obtained by mixing component A and component B-1, component B-2 is formed and included in the resin composition. 7. The method according to claim 1, wherein the prepreg is prepared by impregnating the epoxy resin in the reinforced fiber. 8. The method according to claim 1, wherein the reinforced fiber is a carbon fiber. 9. The method according to claim 1, wherein the reinforced fiber is unidirectional or woven. 10. The method according to claim 1, wherein the prepreg consists of the reinforced fiber and the epoxy resin composition.