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A kind of corona-resistant polyimide-based composite material and preparation method thereof

A polyimide-based, composite material technology, applied in the field of insulating materials, can solve the problems of reduced mechanical properties of composite materials, reduced corona resistance uniformity of thin films, and reduced corona resistance performance, etc. Functional effect, the effect of improving corona resistance

Active Publication Date: 2020-07-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in order to meet the requirements of corona resistance performance of this type of film, a large amount of inorganic nanoparticles need to be added, which causes a large number of nanoparticles to gather in polyimide, which will reduce the uniformity of corona resistance of the film, thereby making the overall corona resistance At the same time, the use of a large amount of fillers also caused a significant decrease in the mechanical properties of the composite

Method used

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  • A kind of corona-resistant polyimide-based composite material and preparation method thereof
  • A kind of corona-resistant polyimide-based composite material and preparation method thereof
  • A kind of corona-resistant polyimide-based composite material and preparation method thereof

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preparation example Construction

[0055] The invention provides a method for preparing a corona-resistant polyimide-based composite material, which is characterized in that it comprises the following steps:

[0056] a) heating and reacting the layered silicate and the organic intercalation agent in the first solvent to obtain the layered silicate modified by organic intercalation;

[0057] In situ polymerization of the layered silicate modified by organic intercalation and the polymerized monomer of polyimide in a second solvent to obtain a mixed solution I;

[0058] b) performing in-situ polymerization reaction of inorganic nanoparticles and polymerized monomers of polyimide in a third solvent to obtain mixed solution II;

[0059] c) After mixing the mixed solution I and the mixed solution II, heat treatment is performed to obtain a polyimide-based composite material;

[0060] The layered silicate is an aluminosilicate layered material;

[0061] The organic intercalation agent is selected from one or more o...

Embodiment 1

[0148] Add aniline hydrochloride (2.29g, 0.022mol) and sodium montmorillonite (10.0g, 0.01mol) into water (100mL), heat to 100°C, and react for 12h. After that, the solid matter was filtered out and dried to obtain aniline intercalation modified montmorillonite with a yield of 95%. Gained sample is carried out wide-angle X-ray diffraction test, the result is as follows figure 1 as shown, figure 1 It is the X-ray diffraction pattern of aniline intercalation modified montmorillonite in Example 1. It can be seen that there is an obvious characteristic peak at 2θ=6.5°, and the interlayer distance is enlarged to 1.38nm calculated by combining with the Bragg equation.

[0149] The resulting aniline intercalation modified montmorillonite (0.45g) and diphenyl ether diamine (2.00g, 10.0mmol) were added to N,N-dimethylacetamide (23g), stirred at room temperature, and then added pyromellitic Formic dianhydride (2.18 g, 10.0 mmol) was stirred at room temperature for 24 hours to obtain ...

Embodiment 2

[0153] Add 4-hydroxyaniline hydrochloride (3.18g, 0.023mol) and sodium montmorillonite (10.0g, 0.01mol) into water (100mL), heat to 100°C, and react for 12h. After that, the solid matter was filtered out and dried to obtain 4-hydroxyaniline intercalated modified montmorillonite with a yield of 97%. Gained sample is carried out wide-angle X-ray diffraction test, the result is as follows figure 2 as shown, figure 2 It is the X-ray diffraction pattern of 4-hydroxyaniline intercalation modified montmorillonite in Example 2. It can be seen that there is an obvious characteristic peak at 2θ=5.1°, and the interlayer distance is enlarged to 1.73nm calculated by combining with the Bragg equation.

[0154] The resulting 4-hydroxyaniline intercalated modified montmorillonite (0.50g) and diphenyl ether diamine (2.00g, 10.0mmol) were added to N,N-dimethylacetamide (23g), stirred at room temperature, and then added Biphenyldianhydride (2.94g, 10.0mmol) was stirred at room temperature f...

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Abstract

The invention provides a corona-resistant polyimide-based composite material and a preparation method thereof. In the preparation method of the corona-resistant polyimide-based composite material provided by the present invention, the layered silicate and the organic intercalation agent are heated and reacted in the first solvent to obtain the layered silicate modified by organic intercalation ; Then the layered silicate modified by organic intercalation and the polymerized monomer of polyimide are polymerized in situ in the second solvent to obtain mixed solution I; the polymerization of inorganic nanoparticles and polyimide The monomers are polymerized in situ in the third solvent to obtain a mixed solution II; finally, the mixed solution I and the mixed solution II are mixed and then heat-treated to obtain a polyimide-based composite material. The composite material prepared according to the preparation method of the invention can obviously improve the corona resistance performance of the polyimide, and also improve the mechanical performance of the polyimide.

Description

technical field [0001] The invention relates to the technical field of insulating materials, in particular to a corona-resistant polyimide-based composite material and a preparation method thereof. Background technique [0002] Corona-resistant film is a high-performance insulating material used for inter-turn insulation of variable frequency motors. This film material is widely used in high-power variable frequency motors such as motor vehicle traction motors, wind power generators, high-frequency and high-voltage motors, and external insulation of extra-large coils. Corona-resistant protective layer, wind power cables, petroleum motor cables and other fields. [0003] Corona-resistant film materials in the prior art are mainly polyimide film composite materials, and this composite material mainly improves the corona-resistant performance of the film by adding corona-resistant fillers to polyimide. At present, the main application in the market is Kapton CR, a corona-resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08K9/04C08K3/34C08K3/22C08K3/38C08L79/08C08J5/18
Inventor 郭海泉陈文慧马平川高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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