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Nano Al2O3 composite corona-resistant polyimide film

A technology of polyimide film and corona resistance, which is applied in the fields of chemical products and its preparation, corona-resistant polyimide film and its preparation, and can solve the problem of poor film yield, corona resistance and uniformity, dispersion Poor effect and other problems, to achieve the effect of good electrical performance, narrow size distribution, and uniform particle dispersion

Active Publication Date: 2013-03-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the content of nanometer metal oxides is basically 10-15%, the particle size is about 80nm, and the dispersion effect is poor, so the yield, corona resistance and uniformity of the film are poor

Method used

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  • Nano Al2O3 composite corona-resistant polyimide film
  • Nano Al2O3 composite corona-resistant polyimide film
  • Nano Al2O3 composite corona-resistant polyimide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: The main components of the corona-resistant polyimide film are: pyromellitic dianhydride, 4.4'-diaminodiphenyl ether and a certain mass fraction of surface-modified nano-alumina particles. The size of the nanoparticles is between 30-50nm. The specific ratio is: the mass ratio of pyromellitic dianhydride to 4.4'-diaminodiphenyl ether is 1:1.1, and the surface-modified nano-alumina particles added account for 0.15 of the total mass. The specific preparation method of this polyimide film containing nano-alumina anti-corona is as follows:

[0031] (1) Synthesis of new coupling agent—take 20g of silane coupling agent KH-550 and 9.8g of pyromellitic dianhydride in a flask, add a small amount of water-carrying agent, and heat up to 150°C for 2 hours. The reaction product was extracted with n-butanol, and then vacuum filtered to obtain the product.

[0032] (2) Preparation of nano-alumina particles—dilute ammonia water (made by diluting 28% concentrated ammonia ...

Embodiment 2

[0037] Embodiment two: with the anti-corona polyimide film of a kind of high concentration nano-alumina of embodiment one, its difference is that the massfraction of the nano-alumina particle that adds surface modification is 0.2.

Embodiment 3

[0038] Embodiment 3: a kind of corona-resistant polyimide film with high concentration of nano-alumina as in Embodiment 1, the difference lies in that the mass fraction of added surface-modified nano-alumina particles is 0.3.

[0039] The following table shows various performance characterization values ​​of the films prepared in the three specific examples.

[0040]

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Abstract

The invention relates to a corona-resistant polyimide film containing high-concentration nano metal oxide, which comprises the following main components: benzenetetracarboxylic anhydride, 4, 4'-diamino diphenyl ether and nano-scale aluminum oxide, wherein the particle size of the nano-scale metal oxide is in the range from 30nm to 50nm. The film provided by the invention has the following outstanding advantages that a novel coupling agent is synthesized and is compounded with titanate coupling agent NDZ-130 to conduct surface modification on prepared alpha-Al2O3, thus the modified nano-particles can be steadily and uniformly dispersed in the substrate polyimide film with relatively high mass percentage (can reach 30wt%). By adoption of the above novel technical scheme of the invention, the technical problem that high-concentration nano-metal oxide is very difficultly doped uniformly in the corona resistant polyimide film according to the prior art is solved well, and meanwhile the mechanical strength of the film is kept from dropping.

Description

technical field [0001] The invention relates to a chemical product and a preparation method thereof, more specifically to a corona-resistant polyimide film and a preparation method thereof, and belongs to the technical field of motor electrical insulation. Background technique [0002] Polyimide is widely used in aerospace, military, electrical and electronics, etc. due to its excellent properties such as high thermal stability, high strength and high modulus, low thermal expansion coefficient and dielectric constant, excellent insulation performance and solvent resistance industrial field. However, because it is an organic high polymer, its corona resistance is poor, which limits its application in high-voltage motors and variable frequency speed regulation motor systems. The development of nano science and technology provides new ideas and approaches for the development of new materials and the modification of existing materials. Practice has proved that adding a certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K9/06C08K9/04C08K3/22C08G73/10C08J5/18
Inventor 王冬金召奎梁蓬霞弥永胜赵玉真
Owner UNIV OF SCI & TECH BEIJING
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