A thermoforming method for mixed-braided continuous fiber reinforced thermoplastic structural panels

Abstract

The invention discloses a mixed braiding continuous fiber reinforced thermoplastic structural sheet thermoforming method. First, prepreg is mixed into sheet or strip prepreg on a braiding machine; the prepreg is laid on a mold and vacuumized The bag or polyester film is sealed; then the temperature is raised, vacuumed, and the vacuum negative pressure is maintained. When the temperature reaches the melting point of the thermoplastic resin, the temperature is kept for a period of time, and the pressure is kept for a period of time to cool down. Finally, the vacuum bag or the polyester film is removed to obtain a structural plate. The structural board produced by this mixed braiding method can drive out the air between the inner layers of the prepreg, and the pressure is evenly transmitted through the fibers, avoiding the deviation of the fiber direction, and can be further strengthened on the basis of the original fiber reinforcement. Cost savings.

Description

technical field [0001] The invention relates to a continuous fiber reinforced thermoplastic composite material, in particular to a thermoforming method for a mixed braided continuous fiber reinforced thermoplastic structural plate. Background technique [0002] Thermoplastic composite materials are a general term for various thermoplastic resins reinforced with glass fibers, carbon fibers, and aramid fibers, and are called FRTP (FiberRinforcedThermoPlastics) abroad. Due to the different types of thermoplastic resins and reinforcing materials, the production process and the performance of the composite materials are very different. From the perspective of production technology, thermoplastic composite materials are divided into two categories: short fiber reinforced composite materials and continuous fiber reinforced composite materials. (1) Short fiber reinforced composite materials: ①Injection molding process, ②Extrusion molding process, ③Centrifugal molding Process; (2) C...

AI Technical Summary

Problems solved by technology

[0003] Most of the structural panels produced by continuous fiber reinforced thermoplastic composites are formed by prepreg compression molding. Usually, the prepreg is placed in the mold and then heated and pressurized. However, this method has many defects, such as the prepreg layer The air in the space cannot be removed, the pressure of the press cannot be uniformly transmitted through the fibers, and the direction of the fibers is shifted, the humidity of the prepreg during storage is too high, and the ratio of fiber content to resin cannot be further optimized during the molding process, etc.

[0004] In production and processing, due to fiber production process conditions, surface treatment and other issues, the mixed fiber cannot be well combined with the resin, which will have a great impact on the performance of the produced prepreg, resulting in a decline in the performance of the finished product

Prepregs with different fibers in the same matrix are mostly produced by criss-cross laying at 0° and 90° in the production board, which will greatly increase the resin content during the production process, thereby reducing the fiber content and affecting performance. Medium, fibers tend to slide, wrinkle, wave

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