Preparation method of high-strength organosilicon and polyimide composite foam

Abstract

The invention provides a preparation method for high-strength organosilicone and polyimide compound foam. The preparation method comprises the following steps of firstly, heating multiple aromatic anhydride in a strong polar solvent and reacting with fatty alcohol to obtain a multiple aromatic anhydride derivative carboxylic ester solution; secondly, sequentially adding a catalyst, a surfactant, residual multiple aromatic anhydride and deionized water into the carboxylic ester solution under room temperature conditions to obtain a white material; thirdly, adding a weak polar solvent and hydroxyl silicone oil into the white material to form a uniform combined material; fourthly, quickly adding isocyanate into the combined material for quickly and uniformly stirring to obtain mixed slurry, and quickly pouring the mixed slurry into a die for freely foaming to obtain a foam intermediate; fifthly, heating and curing the foam intermediate to obtain the organosilicone and polyimide compound foam. According to the preparation method provided by the invention, a free foaming mode is adopted, the operation flow is simple, industrial production is easily realized, the production cost is lower, the mechanical properties of products are remarkably improved, and the mechanical properties of materials can be permanently maintained.

Description

technical field [0001] The invention relates to a method for preparing a foam material, in particular to a method for preparing a high-strength organosilicon and polyimide composite foam. Background technique [0002] Polyimide is a kind of high-performance resin with alternating benzene rings and imine rings to form a polymer backbone. Polyimide foam combines the excellent heat resistance, radiation resistance, flame retardancy of polyimide resin and the remarkable heat insulation and vibration reduction properties of porous materials. Therefore, it is widely used in space exploration, cutting-edge equipment and other technical fields. Wait until unanimous approval and application. [0003] However, due to the limitation of the mechanical properties of polyimide foam, polyimide foam is mainly used as a flexible material in the above-mentioned cutting-edge technical fields at present, and cannot be used as a structural support material yet. In order to effectively improve ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the limitations of the mechanical properties of polyimide foam, in the above-mentioned cutting-edge technical fields, polyimide foam is mainly used as a flexible material and cannot be used as a structural support material.

In order to effectively improve the mechanical properties of polyimide foam materials and further broaden the application fields of this type of high-performance polymer porous materials, patent documents such as CN101130632A have successively reported the improvement of the mechanical properties of polyimide foam by introducing inorganic functional fillers. However, the introduction of inorganic functional fillers often causes severe cell structure changes in foam materials; EP0514623A2, US5188879 and other patent documents have successively reported methods for improving the mechanical properties of polyimide foam by introducing honeycomb core materials, but this method The preparation process is complicated, which is not conducive to large-scale industrial production; in industrial production, the method of post-compression and post-processing of the original flexible foam is usually used to improve the mechanical properties of polyimide foam. During use, the deformation will gradually recover, which will lead to the instability of the mechanical properties of the material