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Intermediate material for forming FRP, and method for production thereof

A technology of intermediate materials and reinforced fibers, applied in the direction of layered products, etc.

Inactive Publication Date: 2012-08-15
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, since most of the resin is impregnated during the molding process, depending on the molding conditions, there may be parts that are not completely impregnated with resin, resulting in internal voids and surface pinholes
In addition, since there is no resin on the surface and it is very dry, there are also problems in handling such as difficulty in sticking to the molding die.

Method used

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  • Intermediate material for forming FRP, and method for production thereof
  • Intermediate material for forming FRP, and method for production thereof
  • Intermediate material for forming FRP, and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] 430g / m on release paper 2 The weight per unit area of ​​the resin is uniformly coated with the matrix resin composition to prepare a resin film. Carbon fiber fabric TRK510 manufactured by Mitsubishi Rayon Corporation (fiber unit area weight 646g / m 2 , 2 / 2 twill weave) the underside of the resin film is supplied to impregnate the resin into the carbon fiber fabric. The impregnation temperature was set at 60°C, and the pressure was adjusted to prepare a prepreg. The resin impregnation rate of the obtained prepreg was measured to be 90%, and it was confirmed that it was the prepreg of the present invention.

[0165] Next, four layers of the prepreg of the present invention were laminated at 0° C. with the release paper side being the tool (stainless steel plate) side. At this time, the second layer and subsequent layers are laminated so that the surface on the side of the release paper and the surface on the opposite side are joined together. Carry out vacuum bag moldi...

Embodiment 4

[0177] Epoxy resin composition #830 manufactured by Mitsubishi Rayon Corporation was used as the matrix resin. Using this resin, a resin film was prepared in the same manner as in Example 1, and was impregnated into TRK510. However, the immersion temperature was set at 50°C. The resin impregnation rate of the obtained prepreg was measured to be 60%, and it was confirmed that the obtained prepreg was the prepreg of the present invention. Molding with this prepreg image 3 Molded products of the shape shown. I use a wooden die as a molding die. The laminated structure is made into 8 layers in the manner of [0° / 45° / 90° / -45° / -45° / 90° / 45° / 0°], and the side of the release paper is used as the tool side, and The surface on the release paper side and the surface on the opposite side were put together and laminated. Operability such as lamination operation is no problem at all.

[0178] Molded products were obtained under the following molding conditions: heating up from room tem...

Embodiment 5

[0181] Using the resin used in Example 1, the non-crimped fiber fabric Quadraxial-Carbon-Gelege (+45°: carbon 267 g / m 2 , 0°: Carbon 268g / m 2 、-45°: Carbon 267g / m 2 , 90°: Carbon 268g / m 2 , Suture: polyethersulfone 6g / m 2 , unit area weight 1076g / m 2 ), prepare a prepreg in the same manner as in Example 1. But the weight per unit area of ​​the resin is set to 717g / m 2 . The resin impregnation rate was measured to be 75%, and it was confirmed to be the prepreg of the present invention. FRP was molded by laminating two layers in the same direction of the surface of the prepreg. The molding conditions were implemented under the same conditions as in Example 1. In the obtained molded product, voids were not observed inside, and pinholes were not observed on the surface.

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Abstract

A prepreg which comprises a reinforcing fiber, a reinforcing fiber base material in a sheet form having a reinforcing fiber, and a matrix resin, and has a portion not impregnated with the resin as a passage in evacuation, wherein the portion not impregnated with the resin is formed by a method comprising impregnating the reinforcing fiber base material in a sheet form with the matrix resin from one side thereof with a resin impregnation percentage of 35 to 95 %; a method comprising placing the matrix resin on both sides of the reinforcing fiber base material in a sheet form in such a way thatthe portion not impregnated with the resin is present in a continuous fashion inside the base material; or a method comprising forming a resin-impregnated part (an island part) having the matrix resin and a fiber part (a sea part) having no resin, on the surface of at least one side of the base material, in such a way that the resin covers 3 to 80 % of the surface and the island part accounts for40 % or more of the weave texture of the base material. The above prepreg provides, even when it is formed by the use of the vacuum pressure alone, a FRP which is free of voids in the inside and pinholes on the surface thereof and exhibits excellent appearance.

Description

[0001] This application is the application date of the original application on July 18, 2003, the application number is 03816547.3, and the invention name is "prepreg, intermediate material for FRP molding and its manufacturing method, and manufacturing method of fiber reinforced composite material". Divisional application. technical field [0002] The present invention relates to a prepreg used as an intermediate material for FRP molding. Background technique [0003] Due to its light weight, high strength, and high rigidity, fiber-reinforced composite materials (hereinafter sometimes abbreviated as FRP) are widely used in industries ranging from sports and leisure uses to automobiles and aircraft. Especially in recent years, since the price of carbon fiber has gradually decreased, lighter, higher strength, and higher rigidity carbon fiber reinforced composite materials (hereinafter abbreviated as CFRP) are increasingly used for industrial purposes. [0004] CFRP used f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B5/28B32B5/26B32B5/12B29C70/44B29B11/16B29C70/06B29K105/08C08J5/24
Inventor 后藤和也古贺一城斋藤忠义伊藤彰浩高野恒男若林巧己
Owner MITSUBISHI CHEM CORP
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