Quasi-isotropic reinforcing sheet, FRP molded body, and method for producing FRP molded body

Abstract

Provided are: a quasi-isotropic reinforcing sheet which has excellent formability and can be molded into various shapes while having excellent strength; an FRP molded body which has protrusions that are difficult to break and which are mainly made of the quasi-isotropic reinforcing sheet; and a method for efficiently producing the FRP molded body. In a quasi-isotropic reinforcing sheet S composed of a reinforcing fiber material F and a thermoplastic resin M, a plurality of UD sheet sheets P and P are formed by bonding and integrating continuous fibers in a state that the continuous fibers are arranged in one direction. A sheet main body is formed by bonding the sheet sheets in a state in which the fiber directions of the sheet sheets are randomly oriented and in a state in which the sheet sheets are arranged in layers so as to overlap each other, and a square sheet sheet having a width of 2-20 mm, a length of 5-70 mm, and a width-to-length ratio of 1: 1-1: 6 is used as the UD sheet sheets (P.P...).

Description

[0001] This application is based on a division of a Chinese patent application with an application number of 201810264447.8, an application date of March 28, 2018, and the title of the invention as "quasi-isotropic reinforcing sheet, FRP molded body, and manufacturing method of FRP molded body" Application. technical field [0002] The present invention relates to an improvement of a prepreg sheet, in particular, to a quasi-isotropic reinforcing sheet excellent in strength and formability, and a slender and slender reinforcing sheet using the quasi-isotropic reinforcing sheet as a main material An FRP molded body of a protruding portion and an efficient manufacturing method of the FRP molded body. Background technique [0003] In recent years, fiber reinforced plastics (FRP) composed of reinforcing fiber materials such as carbon fibers and glass fibers and matrix resins have been utilized in various applications due to their excellent functionality. In addition, as FRP, FRP...

AI Technical Summary

Problems solved by technology

[0004] However, with regard to the above-mentioned conventional FRP using continuous fibers, when the laminated prepreg sheets are formed into arbitrary shapes by hot pressing, the long continuous fibers stretched throughout the entire sheet become obstacles to the press mold. The main cause of followability leads to the deterioration of formability, resulting in the disadvantage that the shape that can be molded is limited

[0005] In addition, in the case of using the above-mentioned conventional prepreg sheet, in order to form elongated strip-shaped (rib-shaped) protrusions, it is necessary to thermally fuse or bond the separately molded protrusions to the main body. In this method, the reinforcing fibers of the protrusion and the reinforcing fibers of the main body are cut at the base of the protrusion, so there is a problem that the base of the protrusion becomes easily broken.

[0006] On the other hand, a prepreg sheet has also been developed in the past. In this prepreg sheet, a UD sheet in which continuous fibers are arranged in one direction is finely cut, and the resulting product is arranged in a two-dimensional direction and integrated with a matrix resin. (Refer to Patent Document 1). In Document 1, there is no mention of the technique of using such a prepreg sheet to produce an FRP molded body having elongated protrusions.

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