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Prepreg base material, layered base material, fiber-reinforced plastic, process for producing prepreg base material, and process for producing fiber-reinforced plastic

A technology of prepreg and laminated substrates, which is applied in the field of laminated substrates, fiber reinforced plastics, and fiber reinforced plastics, and can solve the problem of reduced tensile strength, tensile fatigue strength, and unevenness of moldings , can not be considered to have problems such as strength, to achieve the effect of excellent mechanical properties, small unevenness, and excellent dimensional stability

Active Publication Date: 2009-12-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, compared with the molded body molded by the SMC molding method, although the mechanical properties of the molded body molded using the prepreg base material having the slits are greatly improved and the unevenness is reduced, it cannot be considered to be sufficiently suitable for use as a structural material. Strength of
Compared with the prepreg base material formed of continuous fibers, since it has a structure including defects such as incisions, the incisions, which are stress concentration points, become the origin of failure in the molded body, especially the tensile strength of the molded body , The problem of lower tensile fatigue strength

Method used

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  • Prepreg base material, layered base material, fiber-reinforced plastic, process for producing prepreg base material, and process for producing fiber-reinforced plastic
  • Prepreg base material, layered base material, fiber-reinforced plastic, process for producing prepreg base material, and process for producing fiber-reinforced plastic
  • Prepreg base material, layered base material, fiber-reinforced plastic, process for producing prepreg base material, and process for producing fiber-reinforced plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0290] Epoxy resin ("Epicoat (registered trademark)" manufactured by Japan Epoxy Resin Co., Ltd. 828: 30 parts by weight, "Epicoat (registered trademark)" 1001: 35 parts by weight, "Epicoat (registered trademark)" 154 parts by weight using a kneader : 35 parts by weight) and heated and kneaded 5 parts by weight of thermoplastic resin polyvinyl formal ("Vinylec (registered trademark)" K) manufactured by Chisso Co., Ltd. to dissolve the polyvinyl formal uniformly, and then kneaded Refining 3.5 parts by weight of curing agent dicyandiamide (Japan Epoxy Resin (Co., Ltd.) system DICY7), 4 parts by weight of curing accelerator 3-(3,4-dichlorophenyl)-1,1-dimethylurea (protected DCMU99 manufactured by Tsuchiya Chemical Industry Co., Ltd.) prepared an uncured epoxy resin composition. This epoxy resin composition was coated on silicon-coated release paper with a thickness of 100 μm using a reverse roll coater to prepare a resin film.

[0291] Then, a resin film is laminated on both sid...

Embodiment 2

[0302] Except that the curing accelerator was changed to 5 parts by weight of 2,4-toluene bis(dimethylurea) ("Omicure (registered trademark)" 24 manufactured by PTI Japan Co., Ltd.), it was performed in the same manner as in Example 1 to produce A notched prepreg base material, and a laminated base material using the base material. A fiber-reinforced plastic was obtained in the same manner as in Example 1, except that the pressing time (curing time) of the obtained laminated base material was changed to only 3 minutes with a heat-type press molding machine. Although the pressing time was 1 / 10 of that of Example 1, it showed substantially the same glass transition temperature, and it was found that the epoxy resin composition used had excellent rapid curing properties.

[0303] The resulting fiber-reinforced plastic has no fiber undulations and the fibers flow equally to their ends. In addition, there was no warpage, and it had good appearance quality and smoothness. The tens...

Embodiment 3

[0305] Except that the curing accelerator was changed to 7 parts by weight of 4,4-methylene bis(phenyl dimethyl urea) ("Omicure (registered trademark)" 52 manufactured by PTI Japan Co., Ltd.), the same method as in Example 2 was used. Methods to obtain fiber reinforced plastics. Although the pressing time was 1 / 10 of that of Example 1, it showed substantially the same glass transition temperature, and it was found that the epoxy resin composition used had excellent rapid curing properties.

[0306] The resulting fiber-reinforced plastic has no fiber undulations and the fibers flow equally to their ends. In addition, there was no warpage, and it had good appearance quality and smoothness. The tensile elastic modulus was 44 GPa, and the tensile strength was 430 MPa, showing high values. The coefficient of variation (CV value) of the tensile strength was 5%, showing a low value. The above values ​​are not inferior to those of Example 1.

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Abstract

A prepreg base material which comprises many reinforcing fibers arranged in one direction and a matrix resin present among the many reinforcing fibers. The prepreg base material has, throughout the whole surface, many incisions each extending in a direction crossing the reinforcing fibers, substantially all of the reinforcing fibers having been divided by one or more of the incisions. The reinforcing fiber segments formed by division by the incisions have a length (L) of 10-100 mm. The prepreg base material has a thickness (H) of 30-300 [mu]m, and the content by volume (Vf) of the reinforcingfibers in the prepreg base material is 45-65%.

Description

technical field [0001] The present invention relates to a prepreg base material composed of a plurality of reinforcing fibers and a matrix resin. Also, the present invention relates to a laminated base material in which at least a part of a plurality of laminated reinforcing fiber sheets is composed of the prepreg base material of the present invention. Furthermore, the present invention also relates to a fiber-reinforced plastic molded from the laminated base material of the present invention. The present invention also relates to a method for producing the prepreg base material of the present invention and the fiber-reinforced plastic of the present invention. [0002] The prepreg base material of the present invention has good flowability of the reinforcing fibers accompanying the flow of the matrix resin when molding a fiber-reinforced plastic molded article, and as a result, good molding followability is obtained in molding a molded article having a desired shape. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/16B29C43/34B29C70/06B32B5/28B29K101/10B29K105/10B29L9/00
CPCB29B11/16B29C70/20B32B2260/046B29C70/14B29C43/34B32B2250/20B32B3/266B29C70/202B29C2043/463B32B5/26B29K2105/0809B29K2105/06B32B5/12B29C70/54B32B2260/023B29C43/20B29C43/222B32B2262/02B32B2262/0253B32B2262/0269B32B2262/06B32B2262/08B32B2262/10B32B2262/101B32B2262/103B32B2262/105B32B2262/106B32B2307/734B32B2605/00B29C2793/0054B29C70/545Y10T428/2931Y10T428/24124Y10T428/24322Y10T428/24132Y10T428/24488Y10T428/24314Y10T428/2457Y10T428/2913Y10T428/298Y10T442/425Y10T442/20Y10T428/249924Y10T442/40Y10T442/3065Y10T442/30Y10T428/249934B29C2793/0036B29C70/06B32B5/28
Inventor 武田一朗佐藤成道和田原英辅
Owner TORAY IND INC
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