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Corona-resistant polyimide film and process for preparing same

A technology of polyimide film and corona resistance, which is applied in the field of preparing nano-polymer insulating materials, can solve the problems of limited dispersion, low peel strength, and difficulty in meeting processing requirements, and achieve outstanding dispersion effect, excellent comprehensive performance, The effect of the preparation method is stable

Inactive Publication Date: 2014-07-23
周天兴 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polymerization tendency, and the dispersant and emulsifier added to the system will also have a certain negative impact on the product, especially the surface of the product is too smooth, resulting in very low peel strength after coating F46 resin, which is difficult to meet the requirements of subsequent processing. , there are also surfactants and suspending agents added to the system when preparing the suspension, and the nanoparticles are uniformly dispersed in a high-speed shear disperser, but when the suspension is put into the polyamic acid solution and mixed with an ultrasonic machine, Strong cavitation is resolved by high viscosity polyamic acid solution, so the dispersing effect is limited

Method used

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  • Corona-resistant polyimide film and process for preparing same

Examples

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preparation example Construction

[0022] 1. Preparation of component A: Pre-disperse the raw materials of component A by stirring, and then use high-pressure dispersion technology to restore the nano-filler to the original nano-particle size after dispersion, so that the resin can be homogeneous after dispersion, and the resin can be uniformly distributed through the resin Wrapped on the surface of the nano-filler and cross-linked to prevent the re-agglomeration of the nanoparticles, so that the nano-filler and resin system in the A component become a uniform and stable corona-resistant component A;

[0023] 2. Preparation of component B: react two or three kinds of reactive monomers in a polar solvent, and control its molecular weight by controlling the viscosity to prepare component B of low-molecular polyamic acid solution;

[0024] 3. Preparation of corona-resistant polymer polyamic acid solution: put component A into component B, stir the nanometer filler in the mixing system uniformly and stably through s...

Embodiment 1

[0037]1. Component A of corona-resistant slurry: mix nano-alumina with N,N-dimethylacetamide

[0038] and silane coupling agent in the container by stirring for high-speed shear pre-dispersion, put into self-made

[0039] The resin is pre-dispersed, and then dispersed in a high-pressure disperser to make a uniform and stable corona-resistant slurry. The amount of silane coupling agent is 0.03~0.5% of the solvent amount, preferably 0.03~0.08%,

[0040] The amount of nano-alumina is 10-35% of the solid content in the polyamic acid solution, preferably 16-28%, and the amount of resin and nano-alumina is 1:1.

[0041] 2. Component B of low-molecular polyamic acid solution: at room temperature and normal pressure, put 4,4'-diaminodiphenyl ether into the polar solvent N,N-dimethylacetamide in the reaction kettle, and accelerate the process by stirring. Dissolve, then sprinkle pyromellitic dianhydride into the system for reaction, use cooling water to control the reaction temperatur...

Embodiment 2

[0048] 1. Component A of the corona-resistant slurry is the same as that in Example 1.

[0049] 2. Low-molecular polyamic acid solution component B, at room temperature and normal pressure, put 4,4'-diaminodiphenyl ether and p-phenylenediamine into the reaction kettle polar solvent N,N-dimethylacetamide In the process, the dissolution is accelerated by stirring, and then the pyromellitic dianhydride is scattered into the system for reaction, and the reaction temperature is controlled by cooling water to ≤65°C, and the low-molecular polyamic acid solution is prepared through the reaction, and the viscosity is low. The reaction molar ratio of tetracarboxylic dianhydride and 4,4'-diaminodiphenyl ether to p-phenylenediamine is ≤0.8:0.7:0.3

[0050] 3. The preparation of the corona-resistant polymer polyamide solution is the same as that in Example 1. Among them, the final reaction mol ratio of pyromellitic dianhydride to 4,4'-diaminodiphenyl ether and p-phenylenediamine is 1:0.7:...

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Abstract

The invention provides a preparation process capable of stably producing corona-resistant polyimide films in an actual environment. First, components A and B are prepared, component A is made into a stable and uniform corona-resistant slurry, and component B The components are made into a low-molecular polyamic acid solution; component A is put into component B, and the nano-filler in the mixed system is uniformly and stably distributed through strong mechanical stirring, and pyromellitic dianhydride is added by in-situ polymerization method Continue the reaction to prepare a corona-resistant high-molecular polyamic acid solution; according to the characteristics of the corona-resistant high-molecular polyamic acid solution, adopt the suitable casting process to prepare a film at 130-175 ° C, and use 380~450℃ high temperature imidization process to make corona resistant polyimide film.

Description

technical field [0001] The invention relates to the technical field of preparing nano-polymer insulating materials, in particular to a corona-resistant polyimide film and a preparation process thereof. Background technique [0002] Polyimide film has excellent weather resistance, flame retardancy, flexibility, chemical stability, and high and low temperature resistance, and has a series of excellent electrical and physical properties. It is made of polyimide film wrapped with metal wires. The formed magnet wire has been widely used in the field of electrical insulation. Recently, with the emergence of high-frequency motors, high-voltage motors, and variable-frequency motors, these motors have been working in the environment of corona discharge for a long time. The traditional polyimide film is difficult for long-term Corona discharge can cause premature aging and damage. In order to improve the service life of the motor, polyimide film is used as the basic insulating materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K3/22C08K3/36C08G73/10C08J5/18
Inventor 周天兴周慰嘉
Owner 周天兴
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