Resin composition for fiber-reinforced composite material, cured product thereof, fiber-reinforced composite material, molding of fiber-reinforced resin, and process for production thereof

Abstract

The present invention provides a resin composition for a fiber-reinforced composite material, which has excellent fluidity and impregnation into a fiber base material and which produces a cured product having excellent heat resistance. A resin composition for a fiber-reinforced composite material contains, as essential components, a poly(glycidyloxyaryl) compound (A), a polymerizable monomer (B) which is an unsaturated carboxylic acid or an anhydride thereof and has a molecular weight of 160 or less, an aromatic vinyl compound or a (meth)acrylate (C), and a radical polymerization initiator (D), wherein an equivalent ratio [glycidyloxy group/acid group] of a glycidyloxy group in the component (A) to an acid group in the component (B) is 1/1 to 1/0.48, and a molar ratio [(B)/(C)] of the component (B) to the component (C) is in the range of 1/0.55 to 1/2.

1 - 8 . (canceled) 
     
     
         9 . A fiber-reinforced plastic molding material comprising, as essential components, reinforcing fibers and a resin composition for a fiber-reinforced plastic molding, wherein the composition comprises, as essential components, a poly(glycidyloxyaryl) compound (A) selected from the group consisting of bisphenol epoxy resins and novolac epoxy resins, a polymerizable monomer (B) selected from the group consisting of acrylic acid, methacrylic acid and anhydrides thereof, an aromatic vinyl compound or a (meth)acrylate (C), and a radical polymerization initiator (D), wherein an equivalent ratio [glycidyloxy group/acid group] of a glycidyloxy group in the component (A) to an acid group in the component (B) is 1/1 to 1/0.48, and a molar ratio [(B)/(C)] of the component (B) to the component (C) is in the range of 1/0.55 to 1/2. 
     
     
         10 . The fiber-reinforced plastic molding material according to  claim 9 , wherein the volume content of the reinforcing fibers is in the range of 40 to 85%. 
     
     
         11 . A fiber-reinforced plastic molding comprising, as essential components, reinforcing fibers and a cured product of the resin composition for a fiber-reinforced plastic molding according to  claim 9 . 
     
     
         12 . The fiber-reinforced plastic molding according to  claim 11 , wherein the volume content of the reinforcing fibers is in the range of 40 to 85%. 
     
     
         13 . A method for producing a fiber-reinforced plastic molding, the method comprising impregnating, by injection, a base material, which is composed of reinforcing fibers and disposed in a mold, with the resin composition for a fiber-reinforced plastic molding according to  claim 9 , and then curing the resin composition by an in-situ polymerization reaction. 
     
     
         14 . The method for producing a fiber-reinforced plastic molding according to  claim 13 , wherein the method uses a vacuum RTM molding method including reducing the pressure in a cavity of a mold in which a base material composed of reinforcing fibers is disposed, and impregnating the base material with the resin composition for a fiber-reinforced plastic molding by injecting into the cavity using a differential pressure between the reduced pressure in the cavity and outside pressure. 
     
     
         15 . (canceled) 
     
     
         16 . A fiber-reinforced plastic molding material comprising, as essential components, reinforcing fibers and a resin composition for a fiber-reinforced plastic molding, wherein the composition comprising, as essential components, bisphenol epoxy resins as a poly (glycidyloxyaryl) compound (A), a polymerizable monomer (B) selected from the group consisting of acrylic acid, methacrylic acid and anhydrides thereof, an aromatic vinyl compound or a (meth) acrylate (C), and a radical polymerization initiator (D), wherein an equivalent ratio [glycidyloxy group/acid group] of a glycidyloxy group in the component (A) to an acid group in the component (B) is 1/1 to 1/0.48, and a molar ratio [(B)/(C)] of the component (B) to the component (C) is in the range of 1/0.55 to 1/2. 
     
     
         17 . The fiber-reinforced plastic molding material according to  claim 16 , wherein the volume content of the reinforcing fibers is in the range of 40 to 85%. 
     
     
         18 . A fiber-reinforced plastic molding comprising, as essential components, reinforcing fibers and a cured product of the resin composition for a fiber-reinforced plastic molding according to  claim 16 . 
     
     
         19 . A method for producing a fiber-reinforced plastic molding, the method comprising impregnating, by injection, a base material, which is composed of reinforcing fibers and disposed in a mold, with the resin composition for a fiber-reinforced plastic molding according to  claim 16 , and then curing the resin composition by an in-situ polymerization reaction. 
     
     
         20 . A method for producing a fiber-reinforced plastic molding comprising impregnating, by injection, a base material, which is composed of reinforcing fibers and disposed in a mold, with the resin composition for a fiber-reinforced plastic molding of  claim 16 , and then curing the resin composition by an in-situ polymerization reaction, wherein the method uses a vacuum RTM molding method including reducing the pressure in a cavity of a mold in which a base material composed of reinforcing fibers is disposed, and impregnating the base material with the resin composition for a fiber-reinforced plastic molding by injecting into the cavity using a differential pressure between the reduced pressure in the cavity and outside pressure.