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All-organic composite material film and preparation method and application thereof

A composite material film and organic filler technology, applied in the field of all-organic composite material film and its preparation, can solve the problem of reduced breakdown field strength, inability to meet high dielectric constant, high breakdown strength, high energy density processing performance, composite Increased material loss, etc.

Active Publication Date: 2022-03-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this composite material, by rationally designing the content of conductive filler, the dielectric constant of the composite material can reach 26 at 100 Hz, and the energy density can reach 12.5J / cm 3 , but the breakdown field strength will decrease significantly with the increase of conductive filler
[0004] However, the currently reported polymer-based dielectric composites cannot meet the requirements of high dielectric constant, high breakdown strength, high energy density and excellent processability.
For example, when ceramic particles with high dielectric constant or conductive particles are added to the polymer matrix, the loss of the composite material will increase, causing the problem of efficiency drop

Method used

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  • All-organic composite material film and preparation method and application thereof

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preparation example Construction

[0061] According to the method for preparing an all-organic composite film according to an embodiment of the present invention, by mixing an organic filler, a polymer matrix, and a solvent, an organic filler including nitrile rubber is dispersed in a polyvinylidene fluoride-co-hexafluoropropylene polymer In the material matrix, the polymer including polyvinylidene fluoride-co-hexafluoropropylene is used as the matrix, and the organic filler including nitrile rubber is used as the dispersed phase. As an organic material, nitrile rubber is mixed with polyvinylidene fluoride During the blending process of ethylene-co-hexafluoropropylene, the molecular chains can be cross-linked to form a cross-linked structure, and traps are introduced inside the composite material, which can play the role of trapping charges, and then the resulting mixed solution Applied on the substrate to prepare a rough-grade all-organic composite film, and then subject the rough-grade all-organic composite fi...

Embodiment 1

[0065] (1) Add 0.0051 g of nitrile rubber into 10 mL of dimethylformamide solution, then magnetically stir at 50° C. for 30 minutes, and then ultrasonically vibrate for 60 minutes with a power of 400 W to obtain a nitrile rubber solution;

[0066] (2) Add 0.5 g of polyvinylidene fluoride-co-hexafluoropropylene into 10 mL of dimethylformamide solution, and stir at 50° C. for 60 minutes to obtain a polyvinylidene fluoride-co-hexafluoropropylene solution;

[0067] (3) Mix the nitrile rubber solution with the polyvinylidene fluoride-co-hexafluoropropylene solution, and stir magnetically at 50° C. for 5 hours to obtain a mixed solution;

[0068] (4) Using the solution scraping method, the mixed solution is coated on a glass plate, and then dried at 70° C. for 12 hours to obtain a rough-grade all-organic composite film;

[0069] (5) Hot-press the rough-grade all-organic composite film at 200°C and 5MPa for 5 minutes, and finally put it into an ice-water mixture for quenching treatme...

Embodiment 2

[0071] The quality of nitrile rubber is replaced by 0.0102g, and all the other processes are the same as in Example 1.

[0072] The dielectric constants, breakdown field strengths and discharge energy densities of the obtained all-organic composite films at room temperature under different frequency conditions are as follows: image 3 , 4 , Curve 2 in 5. Such as Figure 4 , 5 As shown, when the NBR content is 2wt%, the breakdown strength and discharge energy density of the composite film material are the largest, and the distribution energy reaches 510MV / m and 11.3J / cm 3 .

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Abstract

The invention discloses an all-organic composite material film and a preparation method and application thereof.The all-organic composite material film comprises a polymer matrix and an organic filler, the polymer matrix comprises polyvinylidene fluoride-co-hexafluoropropylene, the organic filler is dispersed in the polymer matrix, and the polymer matrix is prepared from polyvinylidene fluoride-co-hexafluoropropylene and polyvinylidene fluoride-co-hexafluoropropylene. And the organic filler comprises nitrile rubber. Therefore, the all-organic composite material film has the advantages of high dielectric constant, good physical and mechanical properties, high breakdown field strength, high discharge energy density and the like.

Description

technical field [0001] The invention belongs to the technical field of dielectric materials, and in particular relates to an all-organic composite film and its preparation method and application. Background technique [0002] In recent years, metallized organic dielectric film capacitors have been favored in the electrical and electronic industries and electronic energy systems due to their extremely high charge and discharge rates, excellent flexibility, processability, excellent insulation properties, and good self-healing properties. Extensive attention and research. Currently, commercially available biaxially oriented polypropylene capacitors (BOPP) have a dielectric constant of about 2.2, and the lower dielectric constant results in energy densities typically below 3 J / cm 3 , which limits the application of film capacitors under the miniaturization requirements of electrical equipment. In order to improve the dielectric constant and energy density of surface capacitor...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08L9/02C08J5/18H01G4/33H01G4/18
CPCC08J5/18H01G4/33H01G4/186C08J2327/16C08J2409/02Y02E60/13
Inventor 党智敏冯启琨钟少龙裴家耀张涌新
Owner TSINGHUA UNIV
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