US 12,460,043 B2
Epoxy resin composition for fiber-reinforced composite material, prepreg, and fiber-reinforced composite material
Yukihiro Kamimura, Kanagawa (JP); and Tomohiro Ito, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 17/995,896
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Dec. 23, 2020, PCT No. PCT/JP2020/048142
§ 371(c)(1), (2) Date Oct. 10, 2022,
PCT Pub. No. WO2021/210219, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-072680 (JP), filed on Apr. 15, 2020.
Prior Publication US 2023/0183416 A1, Jun. 15, 2023
Int. Cl. C08J 5/24 (2006.01); C08G 59/22 (2006.01); C08G 59/38 (2006.01); C08G 59/40 (2006.01); C08G 59/50 (2006.01); C08G 59/56 (2006.01); C08G 59/60 (2006.01); C08J 5/04 (2006.01)
CPC C08G 59/38 (2013.01) [C08G 59/22 (2013.01); C08G 59/4021 (2013.01); C08G 59/5033 (2013.01); C08G 59/5073 (2013.01); C08J 5/042 (2013.01); C08J 5/043 (2013.01); C08J 5/046 (2013.01); C08J 5/243 (2021.05); C08J 5/244 (2021.05); C08J 5/246 (2021.05); C08J 2363/00 (2013.01)] 12 Claims
 
1. An epoxy resin composition for a fiber-reinforced composite material, comprising:
(a) one or more epoxy resins;
(b) an aromatic diamine compound;
(c) a dicyandiamide;
(d) a urea compound; and
(e) an amine adduct compound,
blended in the following blending proportions:
a blending proportion of the (b) aromatic diamine compound being from 0.2 to 0.6 equivalents relative to the (a) epoxy resin,
a blending proportion of the (c) dicyandiamide being from 0.5 to 4.0 mass % relative to a total of the (a) to (e) components,
a blending proportion of the (d) urea compound being from 0.5 to 2.0 mass % relative to the total of the (a) to (e) components, and
a blending proportion of the (e) amine adduct compound being from greater than 0 mass % to 3.0 mass % relative to the total of the (a) to (e) components, wherein
a glass transition temperature of a cured product is 110° C. or higher, the cured product being obtained by curing the resin composition under curing conditions: at 120° C. and for 1.5 hours, until a state where demolding from a mold can be performed.
 
11. A prepreg comprising the epoxy resin composition for a fiber-reinforced composite material according to claim 1, the epoxy resin composition being impregnated into any of glass fiber, quartz fiber, aramid fiber, or carbon fiber.
 
12. A fiber-reinforced composite material according to claim 11, which is a cured product of the prepreg.