Fiber-reinforced resin composite material and method for producing same

Abstract

The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.

1 . A fiber-reinforced resin composite material comprising:
 a simple-shape portion formed of at least one sheet of a prepreg material composed of a reinforcing fiber impregnated with a resin; and   a complex-shape portion formed of a reinforcing fiber impregnated with a resin, the complex-shape portion being integrally formed with the simple-shape portion, wherein   the resin used in the prepreg material and the resin used in the complex-shape portion comprise a same component(s).   
     
     
         2 . The fiber-reinforced resin composite material of  claim 1 , wherein
 the resin used in the prepreg material and the resin used in the complex-shape portion are a benzoxazine resin composition.   
     
     
         3 . The fiber-reinforced resin composite material of  claim 2 , wherein
 the benzoxazine resin composition comprises a compound containing in its molecule a benzoxazine ring represented by a formula (1), an epoxy resin, a curing agent and a toughness enhancing agent:   
       
         
           
           
               
               
           
         
         wherein R 1  represents a chain alkyl group of 1 to 12 carbons, a ring alkyl group of 3 to 8 carbons, a phenyl group or a phenyl group substituted with a chain alkyl group of 1 to 12 carbons or a halogen; and a hydrogen atom is bonded to at least one of carbon atoms at an ortho position and a para position of a carbon atom that bonds the oxygen atom of the aromatic ring in the formula. 
       
     
     
         4 . A method for producing a fiber-reinforced resin composite material, comprising:
 forming a simple-shape portion from at least one sheet of a prepreg material formed of a reinforcing fiber impregnated with a resin; and   forming a complex-shape portion integrally with the simple-shape portion, the complex-shape portion being formed of a reinforcing fiber impregnated with a resin, wherein   the resin used in the prepreg material and the resin used in the complex-shape portion comprise a same component(s).   
     
     
         5 . The method for producing the fiber-reinforced resin composite material of  claim 4 , wherein
 the resin used in the prepreg material and the resin used in the complex-shape portion are a benzoxazine resin composition.   
     
     
         6 . The method for producing the fiber-reinforced resin composite material of  claim 5 , wherein
 the benzoxazine resin composition comprises a compound containing in its molecule a benzoxazine ring represented by a formula (1), an epoxy resin, a curing agent and a toughness enhancing agent:   
       
         
           
           
               
               
           
         
         wherein R 1  represents a chain alkyl group of 1 to 12 carbons, a ring alkyl group of 3 to 8 carbons, a phenyl group or a phenyl group substituted with a chain alkyl group of 1 to 12 carbons or a halogen; and a hydrogen atom is bonded to at least one of carbon atoms of the aromatic ring at an ortho position and a para position relative to the carbon atom that bonds the oxygen atom in the formula.