Method for producing prepreg and method for molding composite material

Patent metadata

Field	Value
Publication number	US-12331176-B2
Application number	US-202118018627-A
Country	US
Kind code	B2
Filing date	Sep 10, 2021
Priority date	Sep 17, 2020
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A method for producing a prepreg in which a reinforcing fiber base material is impregnated with a resin to produce a prepreg, wherein said method comprises: a step for preparing a first resin, which is the resin containing a filler, and a second resin, which is the resin not containing a filler; a step for arranging the second resin adjacent to the reinforcing fiber base material; a step for arranging the first resin adjacent to the reinforcing fiber base material and/or the second resin; and a step for impregnating the reinforcing fiber base material with the resin of the first resin and the second resin.

First claim

The invention claimed is:

1. A method for producing a prepreg in which the prepreg is produced by impregnating a reinforcing fiber preform with a resin, the method comprising:
a step of preparing a first resin which is the resin containing a filler, and a second resin which is the resin without containing the filler;
a step of disposing the second resin to be adjacent to the reinforcing fiber preform;
a step of disposing the first resin to be adjacent to at least one of the reinforcing fiber preform and the second resin; and
a step of impregnating the reinforcing fiber preform with the second resin, wherein
in the step of disposing the first resin, the first resins are disposed on both sides of the reinforcing fiber preform and the second resin which are adjacent to each other, and
one of the first resins disposed on both sides is a third resin which is the resin containing a first filler and a first dispersant, and the other of the first resins disposed on both sides is a fourth resin which is the resin containing a second filler and a second dispersant.

2. The method for producing a prepreg according to claim 1 ,
wherein the first resin and the second resin are different resins.

3. The method for producing a prepreg according to claim 2 ,
wherein the first resin is a resin which shows a carbonization reaction.

4. A method for molding a composite material in which the composite material is molded by using the prepreg produced by the method for producing a prepreg according to claim 3 , the method comprising:
a step of laminating the prepreg;
a step of integrating the laminated prepregs into a laminate;
a step of carbonizing the laminate; and
a step of impregnating the carbonized laminate with molten silicon to mold the composite material.

Assignees

• Mitsubishi Heavy Ind Aero Engines Ltd

Inventors

• Nishiguchi Kiichi
• Akiyama Hiromichi

Classifications

• C08J2300/00

  Characterised by the use of unspecified polymers · CPC title

• B29C70/025

  with particular filler · CPC title

• B29C70/60

  comprising a combination of distinct filler types incorporated in matrix material, forming one or more layers, and with or without non-filled layers · CPC title

• B29C70/0035

  comprising two or more matrix materials · CPC title

• C04B2235/48

  Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins · CPC title