A kind of polyimide composite material prefabricated body and preparation method thereof

Abstract

The invention provides a polyimide composite material prefabricated body and a preparation method thereof, comprising preparing a prepreg from a polyimide solution and reinforcing fibers, and paving the prepreg according to actual product requirements; The completed prepreg is packaged, and the packaged preform includes the fiber layer of pre-impregnated resin, the gas guide layer, the barrier layer, the rubber layer, the breathable layer and the vacuum bag from the inside to the outside; under vacuum conditions, the packaged The prefabricated body is subjected to heat preservation treatment, and the prefabricated body is obtained after cooling. The method has a stable and simple process, can effectively improve the preparation quality of the prefabricated body, and reduce the porosity of the high-temperature composite material.

Description

technical field [0001] The invention relates to a high-temperature-resistant polyimide preform and a preparation method thereof, in particular to an ultra-high-temperature-resistant polyimide preform and a preparation method thereof, and belongs to the technical field of composite materials. Background technique [0002] With the rapid development of aerospace technology, missiles and aircraft are developing towards high-speed, long-distance and structural-functional integration. The long-distance and high-speed have caused serious aerodynamic heating problems, making the missile structure face an increasingly harsh working environment. . [0003] Polyimide is one of the organic polymer materials with the best comprehensive performance. Its heat-resistant temperature can reach above 600°C, and its long-term use temperature ranges from 200 to 500°C. At present, polyimide composite materials are commonly used in the world. The main material of high temperature resistant and h...

AI Technical Summary

Problems solved by technology

The solvent removal process in the entire polyimide composite molding process includes the precipitation of resin oligomers-diffusion mass transfer and the phase change-seepage of oligomers during the heating process. The process is more complicated.

[0004] Due to the high rigidity of the polyimide resin molecular chain, the solubility in organic solvents is not high, resulting in a high solvent content in the prepared prepreg, and a large amount of organic solvents evaporate during the molding process. On the one hand, after reaching the boiling point of the solvent, the solvent A large amount of resin may be taken away, resulting in a low resin content in the composite material. On the other hand, the organic solvent volatilizes after reaching the boiling point, forming a large number of pores in the preform, which affects the subsequent molding. At the same time, the organic solvent volatilizes into the oven and the air in the open environment , has a greater impact on the environment

Images