Sheet-molding compound and fiber-reinforced composite material

Abstract

A sheet-molding compound comprising a thickened thermosetting resin composition and reinforcing fiber bundles. The thermosetting resin composition comprises components (A), (B) and (D). The content of component (D) is 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the total amount of epoxy resin. The final viscosity of the thickened thermosetting resin composition is 150 Pa·s to 20000 Pa·s, and the minimum viscosity is 2 Pa·s to 600 Pa·s, the final viscosity being higher than the minimum viscosity.

1 - 18 : (canceled) 
     
     
         19 . A molding material comprising:
 reinforcing fibers; and   an epoxy resin composition that includes the following Components (F) to (H): Component (F) and epoxy resin, Component (G) dicyandiamide, and Component (H) 2,4-diamino-6[2′-methylimidazolyl-(1′)]-ethyl-s-triazine having an average particle size of 15 μm or less.   
     
     
         20 . The molding material according to  claim 19 , wherein:
 the Component (F) in the epoxy resin composition includes 70% to 100% by mass of a bisphenol type epoxy resin that is liquid at 25° C.;   the content of the Component (G) is 2 to 8 parts by mass with respect to 100 parts by mass of the Component (F); and   the content of the Component (H) is 4 to 10 parts by mass with respect to 100 parts by mass of the Component (F).   
     
     
         21 . The molding material according to  claim 19  further comprising Component (I),
 the Component (I) containing vinyl polymer particles having a core-shell structure, in which the glass transition temperature of the core portion is 30° C. to 130° C., and the glass transition temperature of the shell portion is 60° C. to 150° C., the content of the Component (I) being 10 to 30 parts by mass with respect to 100 parts by mass of the Component (F). 
 
     
     
         22 . The molding material according to  claim 19 , wherein the reinforcing fibers are carbon fibers. 
     
     
         23 . A sheet-molding compound comprising:
 reinforcing fibers; and   a thickened product of an epoxy resin composition including the following Components (F) to (I): Component (F): an epoxy resin, Component (G): dicyandiamide, Component (H): 2,4-diamino-6-[2′-methylimidazolyl-(1′)]-ethyl-s-triazine, and Component (I): vinyl polymer particles having a core-shell structure, in which the glass transition temperature of the core portion is 30° C. to 130° C., and the glass transition temperature of the shell portion is 60° C. to 150° C.   
     
     
         24 . The sheet-molding compound according to  claim 23 , wherein the reinforcing fibers are carbon fibers. 
     
     
         25 . A fiber-reinforced composite material being a cured product of a molding material recited in  claim 19 . 
     
     
         26 . A fiber-reinforced composite material being a cured product of a sheet-molding compound recited in  claim 23 . 
     
     
         27 . A bulk molding compound comprising:
 reinforcing fibers; and   a thickened product of an epoxy resin composition including the following Components (F) to (I): Component (F): an epoxy resin, Component (G): dicyandiamide, Component (H): 2,4-diamino-6-[2′-methylimidazolyl-(1′)]-ethyl-s-triazine having an average particle size of 15 μm or less, and Component (I): vinyl polymer particles having a core-shell structure, in which the glass transition temperature of the core portion is 30° C. to 130° C., and the glass transition temperature of the shell portion is 60° C. to 150° C.   
     
     
         28 . The bulk molding compound according to  claim 27 , wherein the reinforcing fibers are carbon fibers. 
     
     
         29 . A fiber-reinforced composite material being a cured product of a bulk molding compound recited in  claim 27 .