Corona-resistance polyimide film and manufacturing method thereof

Abstract

The invention discloses a corona-resistance polyimide film, which comprises emulsion, amine solution and pyromellitic dianhydride, wherein the emulsion comprises 7 to 14 mass percent of nano metal oxide and nano metal nitride, 0.3 to 0.6 mass percent of dispersant, 0.3 to 0.5 mass percent of emulsifier and the balance of pyrrolidone; the amine solution comprises 20 to 25 mass percent of 4,4'-diamino-diphenyl ether and 75 to 80 mass percent of dimethylacetylamide, and the mass ratio of the emulsion to the amine solution is 1:(1.1-1.3); and the mass ratio of the pyromellitic dianhydride to the 4,4'-diamino-diphenyl ether is 1:(1.09). The invention also discloses the manufacturing method of the corona-resistance polyimide film. In the invention, the nano metal oxide and nitride are fully dispersed in polyamic acid resin by adding the emulsifier and dispersant and by a high-pressure emulsification technique, and the content of the nano metal oxide and nitride in the polyamic acid resin is high. Therefore, the produced film has high corona resistance and small astigmatic aberration, and at the same time, the film has high mechanical performance, electrical performance and the like.

Description

technical field [0001] The invention relates to the technical field of motor electrical insulation, in particular to a corona-resistant polyimide film and a manufacturing method thereof. Background technique [0002] Domestic research on corona-resistant polyimide films is still incomplete, and some manufacturing methods can only be studied theoretically in the laboratory, and industrial production cannot be realized. Although some methods can realize industrial production, the corona resistance and uniformity of the produced corona-resistant film are not good, and the mechanical properties of the film are greatly reduced, and the yield and quality of production are also relatively low. The content of nanoparticles is large, and the particle size is small, so it is more difficult to disperse. Due to the small particle size, it is easier for the molecules to agglomerate. The apparent phenomenon is that the molecules stick together to form a large "molecule", so it is difficu...

AI Technical Summary

Problems solved by technology

In the prior art, the content of nanometer metal oxides and nitrides is basically 8-12%, the particle size is about 50 nanometers, and the dispersion effect is poor, so the yield, corona resistance and uniformity of the film are poor

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