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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 uniformity of film corona resistance, and reduced corona resistance performance

Active Publication Date: 2018-11-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • 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

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  • Corona-resistant polyimide based composite material and preparation method thereof
  • Corona-resistant polyimide based composite material and preparation method thereof
  • Corona-resistant polyimide based composite material and preparation method thereof

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preparation example Construction

[0060] The invention provides a method for preparing a corona-resistant polyimide-based composite material, comprising the following steps:

[0061] a) heating and reacting the anionic two-dimensional layered material and the organic intercalation agent in a first solvent to obtain an organic intercalation-modified layered material;

[0062] performing in-situ polymerization reaction of the layered material modified by organic intercalation and polyimide polymerized monomer in a second solvent to obtain mixed solution I;

[0063] b) performing in-situ polymerization reaction of inorganic nanoparticles and polymerized monomers of polyimide in a third solvent to obtain mixed solution II;

[0064] c) After mixing the mixed solution I and the mixed solution II, heat treatment is performed to obtain a polyimide-based composite material;

[0065] The anionic two-dimensional layered material is one or more of binary metal hydroxides and multi-element metal hydroxides;

[0066] The ...

Embodiment 1

[0152] Hydroxybutyric acid (2.29 g, 0.022 mol) and magnesium aluminum hydrotalcite (6.04 g, 0.01 mol) were added into ethylene glycol (100 mL), heated to 130° C., and reacted for 12 h. Afterwards, the solid matter was filtered out and dried to obtain hydrotalcite modified by hydroxybutyric acid intercalation with a yield of 98%. According to the wide-angle X-ray diffraction test, there is an obvious characteristic peak at 2θ=6.0°, and the interlayer distance is expanded to 1.47nm according to the Bragg equation.

[0153] Add the obtained hydroxybutyric acid-modified hydrotalcite (0.45g) and 4,4'-diphenyl ether diamine (2.00g, 10.0mmol) into N,N-dimethylacetamide (23g), stir at room temperature, Then, pyromellitic dianhydride (2.18 g, 10.0 mmol) was added and stirred at room temperature for 24 hours to obtain a mixed solution I. After testing, the bulk viscosity of the mixed solution I is 1.0dL / g, and the rotational viscosity is 16×10 5 cP.

[0154] Add nano-alumina (0.84g) ...

Embodiment 2

[0157] Add aminobutyric acid (2.26g, 0.022mol) and magnesium aluminum hydrotalcite (6.04g, 0.01mol) to ethylene glycol (100mL), heat to 130°C, and react for 12h. After that, the solid matter was filtered out and dried to obtain GABA-modified hydrotalcite with a yield of 94%. 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 the hydrotalcite modified by aminobutyric acid intercalation in Example 2. It can be seen that there is an obvious characteristic peak at 2θ=4.8°, and the interlayer distance is enlarged to 1.83nm calculated by combining the Bragg equation.

[0158] Add the obtained aminobutyric acid-modified hydrotalcite (0.50g) and 4,4'-diphenyl ether diamine (2.00g, 10.0mmol) into N,N-dimethylacetamide (23g), stir at room temperature, Then 4,4'-biphenyldianhydride (2.94g, 10.0mmol) was added and stirred at room temperature for 24 hours to obtain a mixed solution I...

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Abstract

The invention provides a corona-resistant polyimide based composite material and a preparation method thereof. The preparation method provided by the invention comprises the steps that an anionic two-dimensional layered material and an organic intercalation agent are subjected to heating reaction in a solvent; then, the mixture and polyimide polymerization monomers are subjected to in-situ polymerization reaction in the solvent; a mixed solution I is obtained; inorganic nanoparticles and the polyimide polymerization monomers are subjected to in-situ polymerization reaction in the solvent; a mixed solution II is obtained; then, the solution I and the solution II are mixed; heat treatment is performed to obtain the polyimide based composite material. The composite material prepared by the preparation method provided by the invention can improve the polyimide corona-resistant performance and also obtains higher mechanical property and excellent temperature resistant performance.

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 functional film material used for motor insulation. This film material is widely used in the turn-to-turn insulation and main insulation of high-power variable-frequency motors such as motor vehicle traction motors, wind power generators, high-frequency and high-voltage motors, and Extra-large coil outer insulation and corona-resistant protective layer, wind power generation 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K9/04C08K3/26C08K3/22C08J5/18
CPCC08G73/1071C08J5/18C08J2379/08C08K3/22C08K3/26C08K9/04C08K2003/2227C08K2201/011
Inventor 郭海泉陈文慧马平川杨正慧宋玉春高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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