Mitsubishi Chemical Corporation

Kazuhisa Ikeda

Masahiro Ichino

Yoshihide Kakimoto

Mitsuru Kutsuwada

Kouichi Akiyama

Yuma Furuhashi

Tsuneo Takano

Takuya Teranishi

Satoshi Okamoto

Akira Oota

Satoshi Kaji

Daiki Hirakawa

A prepreg sheet includes a plurality of prepreg tapes each of which overlaps with a corresponding adjacent prepreg tape for a suitable overlapping length. The plurality of prepreg tapes each contain a reinforcing fiber bundle that is impregnated with a thermosetting resin composition. According to a method for manufacturing a preform, for example, a primary premolded article is manufactured by preforming an intermediate base material containing a reinforcing fiber base material and a matrix resin composition, and a secondary premolded article is manufactured by preforming the primary premolded article on which the intermediate base material is further placed.

Prepreg sheet and manufacturing method therefor, fiber-reinforced composite material molded article and manufacturing method therefor, and method for manufacturing preform

A prepreg sheet () is formed by stacking a plurality of unit layers () In the unit layers (), prepreg tapes (), in which a reinforced fiber bundle is impregnated with a thermosetting matrix resin composition, are disposed in rows a plurality of times. One or more of the unit layers () has a gap (G) between adjacent prepreg tapes (), and the width thereof is 10% or less of the width of the narrower of the adjacent prepreg tapes ().

Prepreg sheet, method for manufacturing same, unit layer with a covering material, method for manufacturing fiber-reinforced composite, and fiber-reinforced composite

This fiber-reinforced resin molded article has: a sheet molding compound layer; a continuous fiber reinforcing material layer; and a harrier layer, wherein the barrier layer is interposed between the sheet molding compound layer and the continuous fiber reinforcing material layer.

Fiber-reinforced resin molded article and method for manufacturing fiber-reinforced resin molded article

Provided is a thermosetting resin composition (C) of which curing can be started at a relatively low temperature in a short time and a cured product exhibits high heat resistance, the thermosetting resin composition (C) comprising an epoxy resin; an epoxy resin curing agent; and an epoxy resin curing accelerator, wherein the epoxy resin curing agent contains an imidazole-based curing agent 1 which is not encapsulated in a microcapsule and a curing agent 2 which is encapsulated in a microcapsule, and the epoxy resin curing accelerator comprises a urea derivative.

Thermosetting resin composition, prepreg, fiber-reinforced plastic molded body and method for producing same

The purpose of the present invention is to obtain a fiber-reinforced composite material having excellent appearance or mechanical characteristics, whereby a three-dimensional shape is molded with high productivity while appearance defects such as fiber meandering or wrinkling are suppressed. In this method for manufacturing a fiber-reinforced composite material, when a stack in which a plurality of sheet-shaped prepregs (X) in which a plurality of continuously arranged reinforcing fibers are impregnated with a matrix resin composition are layered in different fiber directions is molded into a three-dimensional shape by a molding die () provided with a lower die () and an upper die (), a stretchable sheet () or a resin film (Y) used in the stack () is utilized. In this method for manufacturing a fiber-reinforced composite material, the stack may be pre-molded to obtain a preform, and the preform may be furthermore compression-molded to obtain a fiber-reinforced composite material.

Method for manufacturing fiber-reinforced composite material and fiber-reinforced composite material

The present invention relates to a method for manufacturing a fiber-reinforced composite material molding, having a step (A) for forming a plurality of partial preforms, each having a partial shape obtained by dividing the three-dimensional shape of a target fiber-reinforced composite material molding, by cutting a prepreg sheet containing reinforcing fibers and a matrix resin composition, and by preshaping the cut prepreg pieces; a step (B) for forming a preform having the three-dimensional shape of the target fiber-reinforced composite material molding by combining and integrating the plurality of partial preforms; and a step (C) for producing a fiber-reinforced composite material molding by compression-molding the preform, wherein the step (B) includes arranging a foamable material between the plurality of partial preforms when they are combined.

Fiber reinforced composite material molding and manufacturing method therefor

A manufacturing method for a molded article of a fiber-reinforced composite material obtains a molded article of a fiber-reinforced composite material having a three-dimensional shape by: preparing a sheet-shaped prepreg containing reinforcing fibers and a matrix resin composition; preliminarily shaping the prepreg to produce a plurality of partial preforms having shapes obtained by dividing the shape of the molded article; producing a first partial preform group and a second partial preform group, which have the shape of the molded article, by combining the plurality of partial preforms so that the ends thereof in the direction perpendicular to the thickness direction do not overlap in the thickness direction; producing a preform by bringing the first and second partial preform groups into close contact with each other in the thickness direction; and compression molding the preform using a molding die.

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Tokyo, Japan

Kazuhisa Ikeda