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Sheet winding molding method

A sheet and prepreg technology, applied in the field of sheet winding forming, can solve problems such as slow curing, scattered fibers, and reduced strength, and achieve excellent interlayer shear strength

Pending Publication Date: 2019-12-13
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prepreg using this epoxy resin composition has a problem of slow curing in order to have stability
In addition, in winding molding of prepregs using epoxy resins, there is a problem that when curing is performed at high temperature after winding, the viscosity decreases, and the residual tension caused by winding relaxes, resulting in fiber Scattered, reduced strength

Method used

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  • Sheet winding molding method

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0056] (Manufacturing example 1: Preparation of thermosetting prepreg (1))

[0057] 380 parts by mass of epoxy resin (manufactured by DIC Corporation, "EPICLON 850-S", bisphenol A type epoxy resin, epoxy equivalent is 190), 170 parts by mass of methacrylic acid and 0.16 parts by mass of tert-butylhydroquinone were heated up to 90° C. under gas circulation in which nitrogen and air were mixed at a ratio of 1:1. 1.1 parts by mass of tris(dimethylamino)phenol was added thereto, the temperature was raised to 110° C., and the reaction was carried out for 10 hours, when the acid value became 4 or less, and the reaction was terminated. After cooling to around 60° C., it was taken out from the reaction container to obtain epoxy methacrylate (1).

[0058] 0.02 parts by mass of p-benzoquinone, After 1 part by mass of a polymerization initiator (manufactured by KAYAKUAKZO, "TRIGONOX 27", organic peroxide), 28 parts by mass of 4,4'-diphenylmethane diisocyanate were mixed to obtain a the...

manufacture example 2

[0060] (Manufacturing example 2: Production of thermosetting prepreg (2))

[0061] The mixture of polymethylene polyphenyl polyisocyanate and diphenylmethane diisocyanate (manufactured by TOSOH, "MILLIONATE MR-200", the content of polymethylene polyphenyl polyisocyanate is 56%; hereinafter referred to as "POLYMERIC MDI Mixture (1)") 100 parts by mass, 75.5 parts by mass of hydroxyethyl methacrylate, 15 parts by mass of pentaerythritol polyoxyethylene ether (manufactured by Nippon Emulsifier Co., Ltd., "PNT-40"), phenoxyethyl methacrylate 21 parts by mass of the ester and 2 parts by mass of a polymerization initiator (manufactured by KAYAKU AKZO, "TRIGONOX 27", organic peroxide) were mixed to obtain a thermosetting resin composition (2).

[0062] Using a prepreg manufacturing apparatus, the thermosetting resin composition (2) obtained above was impregnated with carbon fibers (manufactured by FORMOSA PLASTIC CORPORATION, "TC-36P") so that the volume content of the carbon fibers ...

Embodiment 1

[0064] Immediately before winding the 300 mm wide thermosetting prepreg (1) obtained in Production Example 1 around the base, while heating both sides of the prepreg with a 150°C infrared heater, the diameter of the 150°C diameter A tube of 100 mm and width of 500 mm was wound 30 turns at a speed of 22 mm / sec (prepreg lamination time: 14 seconds) at the same winding width, and then kept heated for 90 seconds to obtain a molded product (1). The temperature of the wound prepreg is 146-150°C. The interlaminar shear strength of this molded product (1) was 37 MPa.

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Abstract

Provided is a sheet winding molding method for winding a thermosetting prepreg on a base material while heating the thermosetting prepreg, characterized in that the time before a next thermosetting prepreg is laminated on a thermosetting prepreg that has been wound is shorter than a gel time at the temperature of the thermosetting prepreg that has been wound. The sheet winding molding method has excellent productivity and makes it possible to obtain a molded article having excellent various physical properties, such as interlaminar shear strength.

Description

technical field [0001] The present invention relates to a sheet winding forming method excellent in productivity. Background technique [0002] Fiber-reinforced resin composite materials reinforced with reinforcing fibers such as carbon fiber and glass fiber have attracted attention because of their light weight but still have excellent heat resistance and mechanical strength. Utilization for structure applications is expanding. As a molding method of this fiber-reinforced resin composite material, for example, the following methods are used: autoclave molding, press molding, winding Shaping to solidify and form. In particular, winding molding is performed to obtain a cylindrical molded product. [0003] As a resin for prepreg, a resin that has both stability and curability by heating or the like is generally required, and therefore, thermosetting resins such as epoxy resin compositions are generally used (see, for example, Patent Document 1). . [0004] However, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/32B29C70/16C08J5/24B29K101/10B29K105/08
CPCB29C70/32B29C53/845B29C35/0288B29C53/8066B29C53/56C08J2333/10C08J5/04C08J5/243B29C70/16B29K2101/10B29K2663/00
Inventor 新地智昭河野靖史野中真一
Owner DIC CORP