Thermoplastic composite fiber preform and forming method thereof

Abstract

A thermoplastic composite fiber preform and a forming method thereof are characterized in that a composite is formed by hot pressing of a fabric preform, and the fabric preform is fabric with a three-layer structure and formed by weaving warp yarn of four systems and weft yarn of three systems, wherein upper-layer warp yarn and upper-layer weft yarn are interwoven to form upper-layer fabric, inner-layer warp yarn and inner-layer weft yarn are interwoven to form inner-layer fabric, lower-layer warp yarn and lower-layer weft yarn are interwoven to form lower-layer fabric, and binding warp yarn is intermittently interwoven into the upper-layer fabric, the inner-layer fabric and the lower-layer fabric, so that the upper-layer fabric, the inner-layer fabric and the lower-layer fabric are tightly connected into a whole, the upper-layer fabric and the lower-layer fabric are reinforced fiber yarn braided fabric or the fabric formed by blending reinforced fiber yarn and polyphenylene sulfide yarn, the inner-layer fabric is polyphenylene sulfide yarn fabric, and the binding warp yarn is the reinforced fiber yarn. Through the layout design of the preform organization structure, reinforced fibers and matrix fibers, the design of the resin content and the resin distribution in a final product, and a resin flow path in a machining process is realized, and the preform-composite with large thickness and better impregnation can be obtained.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a fiber prefabricated body of thermoplastic composite material and a molding method thereof. Background technique [0002] Fiber-reinforced thermoplastic composites have received more and more attention in recent years. Compared with thermosetting composites, thermoplastic composites can be formed quickly and can be recycled, especially special engineering plastic-based composites, which have higher temperature resistance. and chemical resistance. [0003] At present, special engineering plastics such as polyphenylene sulfide have high processing temperature and high resin viscosity. It is difficult to directly use reinforced fiber braids for online impregnation molding. On the one hand, online traction will cause fabric deformation; on the other hand, the impregnation effect is poor and unstable. , resulting in large fluctuations in the resin content of the comp...

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Problems solved by technology

[0003]At present, special engineering plastics such as polyphenylene sulfide have high processing temperature and high resin viscosity. It is difficult to directly use reinforced fiber braids for online impregnation molding. Traction will cause fabric deformation; on the other hand, the impregnation effect is poor and unstable, resulting in large fluctuations in the resin content of the composite material, which is difficult to control. What is more serious is that the poor impregnation effect will greatly reduce the mechanical properties of the composite material, and there will be Phenomena such as easy delamination

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