The Yokohama Rubber Co., Ltd.

Yukihiro Kamimura

Tomohiro Ito

Mitsuhiro Iwata

Teruki Miyazaki

An epoxy resin composition for a fiber-reinforced composite material includes: (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 specific ranges.

Epoxy resin composition for fiber-reinforced composite material, prepreg, and fiber-reinforced composite material

To improve quality of a radome using a cyanate ester resin for a skin layer. A radome is formed of a multilayer structure in which a plurality of skin layers are layered on a surface of a core member. The plurality of skin layers include a first fiber reinforced plastic layer containing the cyanate ester resin and a fiber material and a second fiber reinforced plastic layer containing an epoxy resin and a fiber material. The second fiber reinforced plastic layer is disposed at a position in contact with the surface of the core member. A proportion of a thickness of the second fiber reinforced plastic layer to a thickness of all of the skin layers is preferably 50% or less.

Radome

A method of molding a sandwich panel includes a step of providing, on one or both surfaces of an (a) core material, a prepreg or the prepreg and an adhesive as a (b) skin material. The (a) core material is a super engineering plastic foam having a glass transition temperature of greater than 200° C. The (b) skin material contains: a (b-1) epoxy resin having an average molecular weight of 1300 or more or having a trishydroxymethane-type or cresol novolac-type structure and containing, in a total epoxy resin, an amount of 70 to 100 mass % of an epoxy resin that is semi-solid or solid; a (b-2) epoxy resin containing, in the total epoxy resin, an amount of 0 to 30 mass % of an epoxy resin that is liquid; and a (b-3) curing agent.

Sandwich panel molding method

A cyanate ester resin composition contains: a cyanate ester resin; a curing agent or a curing accelerator; silica microparticles; and core-shell rubber particles; in which the resin composition includes from 1 to 5 parts by mass of the silica microparticles and from 2 to 10 parts by mass of the core-shell rubber particles based on 100 parts by mass of the cyanate ester resin, and a mass ratio of the silica microparticles to the core-shell rubber particles is from 1/1 to 1/5.

Growing community of inventors

Hiratsuka, Japan

Yukihiro Kamimura