Preparation method of coal ash modified nanometer aluminum oxide/polyimide composite film

Abstract

The invention discloses a preparation method of a coal ash modified nanometer aluminum oxide / polyimide composite film. The preparation method can be used for preparing the nanometer aluminum oxide hybrid polyimide film by utilizing nanometer aluminum oxide sol, so that corona-resistant characteristics and dielectric performances of the polyimide film can be remarkably improved, and the corona-resistant service life of the nanometer aluminum oxide hybrid polyimide film is 8-9 times that of the pure polyimide film. The preparation method further can be used for improving and overcoming the defects of the pure polyimide film, remarkably improving the mechanical strength, the hardness, the abrasion performance and thermal decomposition temperature of the pure polyimide film, so that the comprehensive performances of the pure polyimide film are improved. Moreover, the novel polyimide nanometer composite film prepared by the preparation method disclosed by the invention has the characteristics of being high temperature resistance, good in mechanical performances, excellent in electrical performances, easy to machine and form, low in cost and the like, so that the development requirements of high and new technologies including the aerospace technology, the micro-electronics technology, the electrical technology, the chemical technology, the energy technology and the like can be completely satisfied.

Description

technical field [0001] The invention relates to a preparation method of polyimide, in particular to a preparation method of fly ash modified nano-alumina / polyimide composite film. Background technique [0002] Polyimide (PI) is a kind of polymer containing imide ring imide group in the main chain, which is obtained by polycondensation of dibasic acid and dibasic amine. Polyimide film is a new type of high temperature resistant organic polymer film, currently the world's best film insulation material, it is composed of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (ODA) It is formed by polycondensation and salivation into a film in the extremely strong solvent dimethylacetamide (DMAC), and then imidized. Because PI has superior thermal properties, electrical properties, mechanical properties and chemical stability, it is widely used in aerospace, spacecraft, navigation, rocket missiles, automobiles, electrical insulation, atomic energy industry, satellites, nucle...

AI Technical Summary

Problems solved by technology

Compared with the previous years, my country's polyimide film production technology has greatly improved and increased both in quality and output, but compared with foreign advanced technology products, there is still a large gap in comprehensive performance. Domestic polyimide films have shortcomings such as poor product quality, unstable comprehensive performance, insufficient product refinement, and few varieties, which affect its application.