Preparation method of fiber reinforced polyphenylene sulfide prepreg

Abstract

The invention discloses a preparation method of a fiber reinforced polyphenylene sulfide prepreg. The method comprises the steps such as: oven-drying a polyphenylene sulfide powder and a fiber fabric,and wiping the surface of the fiber fabric with acetone; spraying the polyphenylene sulfide powder on the surface of the fiber fabric by using a spray gun to form a composite fabric; and performing pressure forming on the composite fabric by a hot press, performing heat preservation and then performing natural cooling to room temperature to prepare the fiber reinforced polyphenylene sulfide prepreg. The method has the advantages that during the melting, and impregnating with the fiber fabric process of the polyphenylene sulfide powder, the contact between the polymer and air can be avoided, and at the same time, a crosslinking degree of a thermoplastic resin during a chain extension process can be effectively controlled to prevent excessive crosslinking. The electrostatic adsorption principle is adopted to make the polyphenylene sulfide powder be adsorbed on fibers, the tiny powder can penetrate into spaces between the fibers, and the manner is better than a manner using a viscous melt to directly impregnate the fibers. The prepared fiber reinforced polyphenylene sulfide prepreg has low porosity, good impregnation effects, and flat and smooth surfaces, and is suitable for a forming process of composite materials.

Description

technical field [0001] The invention relates to a method for preparing a fiber-reinforced polyphenylene sulfide prepreg, which belongs to the technical field of thermoplastic composite prepreg preparation. Background technique [0002] In recent years, fiber-reinforced thermoplastic composites have been greatly developed. Their properties can be designed by themselves, and they can be integrally formed. They have excellent characteristics such as high specific strength, high fracture toughness, high temperature resistance, and corrosion resistance. Compared with thermosetting composite materials, the thermal processing process has a lower impact on the performance of thermoplastic resins, the products can be repeatedly processed, the remaining scraps after molding can be recycled, and thermoplastic prepregs can be stored at room temperature, so in the continuous development of the aviation industry Among them, thermoplastic composites show great development potential. [00...

AI Technical Summary

Problems solved by technology

The production process of thermoplastic prepreg has extremely high requirements on the production process. Most of the traditional thermoplastic prepreg production methods have evolved from the thermosetting prepreg manufacturing process, but they are different from thermosetting resins that are liquid at room temperature. Traditional The processing technology is not completely suitable for the production of thermoplastic prepregs. The main reason is that the processing temperature of thermoplastic resins such as TPI and PPS is extremely high, usually in the range of 300°C to 400°C, and the viscosity of the melt at high temperature is above 100Pa·s. Higher viscosity will make it difficult for the resin to fully impregnate the fibers, and the degree of infiltration of the fibers by the thermoplastic resin determines the mechanical properties and molding quality of the thermoplastic composite material, so how to improve the impregnation rate of the resin to the fibers is the key point of the thermoplastic prepreg preparation process. main problem

At present, the mainstream thermoplastic prepreg impregnation processes in foreign countries include hot melt impregnation process, solution impregnation process, powder process, mixed weaving process, in-situ polymerization process, etc. my country currently does not have the ability to produce stable quality thermoplastic prepregs. The preforming of powder and fiber into prepreg is an effective and non-polluting feasible method

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