Polyimide composite film as well as preparation method and application thereof

A technology of polyimide and polyimide matrix, which is applied in the direction of insulators, electrical components, insulators, etc., and can solve problems such as unsatisfactory cables and cracking of composite films.

Active Publication Date: 2021-06-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the interface effect and stress between polyimide and fluorocarbon materials, the composite film often cracks from the edge of the composite tape in practical applications, and finally the wrapped cable cannot meet the requirements of the standard

Method used

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  • Polyimide composite film as well as preparation method and application thereof
  • Polyimide composite film as well as preparation method and application thereof
  • Polyimide composite film as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0037] The present invention provides the preparation method of polyimide composite membrane described in above-mentioned scheme, comprises the following steps:

[0038] Mixing dianhydride monomers, diamine monomers and aprotic polar solvents for the first polycondensation reaction to obtain polyamic acid;

[0039] Forming the polyamic acid into a film and performing a first imidization reaction to form a first film layer; the degree of progress of the first imidization reaction is 40% to 80%;

[0040] Mix dianhydride monomers, fluorine-containing diamine monomers and aprotic polar solvents, or mix fluorine-containing dianhydride monomers, diamine monomers and aprotic polar solvents, and perform a second polycondensation reaction to obtain Fluoropolyamic acid;

[0041] Coating the fluoropolyamic acid onto the surface of the first film layer, and performing a second imidization reaction to obtain a polyimide matrix film and a fluorine-containing polyimide coating;

[0042] Co...

Embodiment 1

[0069] Pyromellitic anhydride monomer (PMDA: 5 grams) and 4,4'-diaminodiphenyl ether (ODA: 4.59 grams) monomer in N, N-dimethylacetamide (DMAc ultra-dry 99.8%: 38.376 grams) under normal temperature in the solution, carry out polycondensation reaction for the first time, react and make polyamic acid in 12 hours;

[0070] The polyamic acid is formed into a film and the first imidization reaction is carried out under vacuum conditions at 250° C., and the reaction is carried out for 30 minutes (the degree of progress of the imidization reaction is 40%) to obtain the first film layer;

[0071] Pyromellitic anhydride monomer (PMDA: 2.05 g) and 2,2'-bis(trifluoromethyl) diaminobiphenyl (TMAc: 2.946 g) in N,N-dimethylacetamide (DMAc super Dry 99.8%: 9.49 g) in the solution at room temperature to carry out the second polycondensation reaction, and react for 12 hours to obtain fluorine-containing polyamic acid;

[0072] The fluorine-containing polyamic acid is sprayed on the surface o...

Embodiment 2

[0076] The difference from Example 1 is that the thickness of the polyimide base film is 35 μm, the thickness of the fluorine-containing polyimide coating is 0.1 μm, the thickness of the polyperfluoroethylene propylene coating is 1.5 μm, and the polytetrafluoroethylene coating is 1.5 μm. The thickness of the vinyl film was 15 μm.

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Abstract

The invention provides a polyimide composite film as well as a preparation method and application thereof, belonging to the technical field of insulating materials for aerospace cables. According to the invention, a fluorine-containing polyimide coating and a polyimide matrix film are connected through covalent bonds, so the fluorine-containing polyimide coating and the polyimide matrix film form a whole; and meanwhile, the fluorine-containing polyimide coating contains fluorine atoms and has good affinity with a fluorinated ethylene propylene coating, and due to the existence of the fluorine-containing polyimide coating, the interface affinity between polyimide and the fluorinated ethylene propylene coating is greatly improved, and interface effect is remarkably reduced; and a tetrafluoroethylene-hexafluoropropylene copolymer coating can be effectively adhered to a polytetrafluoroethylene film in a hot pressing process, so interfaces among different films in the composite film are greatly improved, and the problem that the composite film is easy to crack in a use process is solved.

Description

technical field [0001] The invention relates to the technical field of insulating materials for aerospace cables, in particular to a polyimide composite film and its preparation method and application. Background technique [0002] Polyimide film has been widely used for aerospace cable insulation since it came out in the 1960s because of its excellent properties such as high heat resistance, strong insulation, and radiation resistance, but it is not resistant to hydrolysis. Fluorocarbon materials have good amphiphobic (oleophobic and hydrophobic) properties and high temperature resistance, but are not resistant to radiation. Therefore, the combination of polyimide and fluorocarbon materials can combine the advantages of both and effectively avoid the defects of both. [0003] Usually, the composite film of polyimide and fluorocarbon material (polytetrafluoroethylene or polyperfluoroethylene propylene) is compounded by hot pressing or hot-melt silicone resin bonding and hot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/60H01B19/00
CPCH01B17/60H01B19/00
Inventor 陈春海张轶材陈海权钱广涛于有海
Owner DONGHUA UNIV
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