Nippon Steel Chemical & Material Co., Ltd.

Kyohei Kano

Yuichi Taniguchi

Naoki Yokoyama

Provided is a resin composition that exhibits satisfactory impregnability into reinforcing fibers, while having rapid curability, and that is suitable for fiber-reinforced composite materials producing molded articles having high heat resistance. A two-pack resin composition for fiber-reinforced composite materials is configured of a base material including an epoxy resin (A) and a (meth)acrylate compound (B) having three or more (meth)acryloyl groups in a molecule, and a curing agent including an amine compound (C) represented by the following general formula (1), a mass ratio of the base material to the curing agent being within the range of from 85:15 to 65:35, Wherein the epoxy resin (A) includes 75% by mass to 100% by mass of a bisphenol A epoxy resin; the base material has a viscosity of 10,000 mPa&#xb7;s or less; and the curing agent has a viscosity of 800 mPa&#xb7;s or less. X&#x2014;(CHNH) (1) (In the formula, X represents an n-valent organic group having 1 to 16 carbon atom; and n represents 2 or 3).

Resin composition for fiber-reinforced composite materials and fiber-reinforced composite material using same

The present invention has an object to provide a resin composition for fiber-reinforced composite materials that excels in rapid curability without impairing low viscosity and heat resistance. A two-component curable resin for fiber-reinforced composite materials is provided, which is configured of a base material including an epoxy resin (A) and a curing agent including an amine compound (B) selected from either norbornane diamine or triethylenetetramine and a phenol compound (C), and in which a mass ratio of the base material to the curing agent is within the range of from 90:10 to 70:30, and the phenol compound (C) includes a phenol compound including two or more phenolic hydroxyl groups and is contained at 5% by weight to 35% by weight in the curing agent. A fiber-reinforced composite material is obtained by mixing reinforcing fibers in the resin composition for fiber-reinforced composite materials.

Resin composition for fiber-reinforced composite materials, and fiber-reinforced composite material using same

Provided is a resin composition that has satisfactory impregnability into reinforcing fibers due to low viscosity and small viscosity increase even in an impregnation process performed for a long time. The resin composition being suitable as a matrix resin for a fiber-reinforced composite material for producing a cured molded article that has toughness and fatigue resistance. The resin composition for a fiber-reinforced composite material includes an epoxy resin, an acid anhydride-based curing agent, an imidazole-based curing accelerator, a radically polymerizable monomer, and a radical polymerization initiator as essential components, has a viscosity at 25&#xb0; C. that falls within a range of 50 mPa&#xb7;s to 800 mPa&#xb7;s as measured by an E-type viscometer, and exhibits a viscosity increase ratio of 200% or less after 8 h at 25&#xb0; C., wherein 50% by mass or more of the acid anhydride-based curing agent is an alicyclic acid anhydride having no olefinic unsaturated bond.

Curable epoxy resin composition, fiber-reinforced composite material and molded body using same

Provided is a resin composition to be suitably used as the matrix resin of a fiber-reinforced composite material excellent in fatigue resistance. In the resin composition for a fiber-reinforced composite material, 50 mass % or more of an epoxy resin (A) includes a phenol novolac-type epoxy resin containing a compound represented by the following general formula (1) and a compound represented by the following general formula (2), and in gel permeation chromatography measurement, the phenol novolac-type epoxy resin contains a body corresponding to m=0 at a ratio of 75% by area or more and a body corresponding to m=1 at a ratio of 6% by area or less.

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Tokyo, Japan

Kyohei Kano