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 problems such as difficult to meet processing requirements, low peel strength, and limited dispersion, and achieve excellent comprehensive performance, outstanding dispersion effect, The effect of the preparation method is stable

Inactive Publication Date: 2012-10-17
周天兴 +1
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  • Abstract
  • Description
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  • 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 an

Method used

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  • Corona-resistant polyimide film and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

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 temperatu...

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 process for stably producing a corona-resistant polyimide film in the actual environment, comprising the following steps: preparing a component A and a component B, wherein the component A is a stable and uniform corona-resistant slurry, and the component B is a polyamic acid solution with low molecular weight; adding the component A into the component B; stirring mechanically at strong force so that nano fillings in a mixing system are distributed uniformly and stable; adding pyromellitic dianhydrider by adopting the in situ polymerization process for continuous reaction to prepare a corona-resistant polyimide solution with high molecular weight; preparing the corona-resistant polyimide solution with high molecular weight into a film at 130-175 DEG C by adopting the corresponding sobbering process according to the characteristics of the corona-resistant polyimide solution with high molecular weight; and preparing the film into the corona-resistant polyimide film at 380-450 DEG C by adopting the imidization process.

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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IPC IPC(8): C08L79/08C08K3/22C08K3/36C08G73/10C08J5/18
Inventor 周天兴周慰嘉
Owner 周天兴
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