Prepreg and surface-protected fiber-reinforced composite material
WO2026141642A1PCT designated stage Publication Date: 2026-07-02TORAY INDUSTRIES INC
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- TORAY INDUSTRIES INC
- Filing Date
- 2025-12-26
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Fiber-reinforced composite materials used in products like aircraft components and wind turbine blades suffer from poor light resistance, as the resin mixing during co-curing with surface materials reduces their light resistance.
Method used
A prepreg with a non-porous buffer film and specific resin composition that suppresses resin mixing during co-curing, ensuring high light resistance and formability, comprising a fibrous substrate impregnated with a resin having low ultraviolet transmittance and a thermoplastic resin film.
Benefits of technology
The prepreg achieves excellent light resistance and formability by preventing resin mixing, maintaining the integrity and UV resistance of the composite material.
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Smart Images
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Abstract
The present invention addresses the problem of providing: a prepreg that has excellent lightfastness, can suppress resin mixing of fiber-reinforced composite materials during co-curing, and also has shapeability; and a fiber-reinforced composite material obtained by laminating the prepreg on the surface of a fiber-reinforced composite material and curing, the fiber-reinforced composite material also being able to be molded into complex shapes. The present invention has the following configuration. A prepreg that satisfies condition (c) and in which a substantially non-porous cushioning film [B] that satisfies condition (b) is present on one surface of a fiber base material [C] at least partially impregnated with a resin [A] that satisfies condition (a). (a) The average transmittance of ultraviolet and visible light in the wavelength range of 280-350 nm is 10% or less. (b) The constituent molecules comprise a linked structure in which a plurality of atoms forming the main chain are connected via covalent, ionic, or metallic bonds, totaling 2,000 or more atoms. (c) A 1 m square prepreg can form, without generating wrinkles, a perfectly circular cross-section having a diameter of 0.3 m for which one of the sides serves as the circumference, and with the side on which the cushioning film [B] is disposed facing inward.
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