Dielectric film, preparation method thereof and film capacitor

A technology of dielectric film and compatibilizer, which is applied in the field of new materials for high-energy storage film capacitors, can solve problems affecting the application range of capacitors, and achieve the effects of low production cost, simple operation process, and easy-to-obtain formula raw materials

Active Publication Date: 2020-06-12
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polypropylene film is usually used to pour epoxy insulating resin directly as an energy storage capacitor, which has certain limitations, and the dielectric constant of polypropylene film is about 2.2, although its breakdown strength is relatively high, about 600kV / mm or more, but in such a low dielectric coefficient case, it affects to a certain extent its application range as a capacitor under a lower working electric field. Therefore, a high dielectric constant and a higher breakdown strength are prepared. Thin film dielectric materials are a huge challenge in this field

Method used

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  • Dielectric film, preparation method thereof and film capacitor
  • Dielectric film, preparation method thereof and film capacitor
  • Dielectric film, preparation method thereof and film capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0055] (1) To prepare all-organic high-dielectric composite pellets, measure 50 parts by weight of polypropylene PP particles and 45 parts by weight of polyvinylidene fluoride, and then measure 5 parts by weight of polypropylene grafted maleic anhydride. After fully stirring and mixing in a high-speed mixer at room temperature to obtain a compound, use a polymer processing blender to melt and knead the compound at 200 ° C, and the blending time is 20 minutes until the reaction of the compound is completed and the mixture is completely uniform. Then extrude and granulate to obtain all-organic high-dielectric composite pellets.

[0056] (2) Stretching to prepare dielectric film

[0057] The all-organic high-dielectric composite pellets in the above (1) are used under certain process conditions (the temperature of the extruder is 260°C, the temperature of the cooling roll is 30°C, and the longitudinal stretching and transverse stretching ratios are both 4 times) Stretching the e...

Embodiment 2

[0062] (1) Prepare all-organic high-dielectric composite pellets, measure 50 parts by weight of polypropylene PP particles and 45 parts by weight of polyvinylidene fluoride, and then measure 5 parts by weight of acrylonitrile-butadiene-styrene Terpolymer grafted with maleic anhydride. After fully stirring and mixing in a high-speed mixer at room temperature to obtain a compound, use a polymer processing blender to melt and knead the compound at 280 ° C, and the blending time is 20 minutes until the reaction of the compound is completed and the mixture is completely uniform. Then extrude and granulate to obtain all-organic high-dielectric composite pellets.

[0063] (2) Stretching to prepare dielectric film

[0064] The all-organic high-dielectric composite pellets in the above (1) are used under certain process conditions (the temperature of the extruder is 280 ° C, the temperature of the cooling roll is 30 ° C, and the longitudinal stretching and transverse stretching ratios...

Embodiment 3

[0066] (1) To prepare all-organic high-dielectric composite pellets, measure 50 parts by weight of polyethylene PE particles and 45 parts by weight of polyvinylidene fluoride, and then measure 10 parts by weight of polyethylene grafted maleic anhydride. After fully stirring and mixing in a high-speed mixer at room temperature to obtain a compound, use a polymer processing blender to melt and knead the compound at 280 ° C, and the blending time is 20 minutes until the reaction of the compound is completed and the mixture is completely uniform. Then extrude and granulate to obtain all-organic high-dielectric composite pellets.

[0067] (2) Stretching to prepare dielectric film

[0068] The all-organic high-dielectric composite pellets in the above (1) are used under certain process conditions (the temperature of the extruder is 280 ° C, the temperature of the cooling roll is 30 ° C, and the longitudinal stretching and transverse stretching ratios are both 4 times) Stretch the e...

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Abstract

The invention discloses a dielectric film, a preparation method thereof and a film capacitor. According to the dielectric film, polyolefin or polyester or polyamide is adopted as a base material, a polyvinylidene fluoride material is adopted as a functional modification component, and the dielectric film further contains a compatilizer. The single-layer or multi-layer full-organic composite high-dielectric energy-storage electrical film is prepared through a granulation process and a solid-phase stretching process. The all-organic composite high-energy-storage dielectric film obtained by the method has excellent mechanical properties, dielectric properties, energy storage properties and charge-discharge characteristics. Electrician films with different compositions and physicochemical properties are expected to be applied to the design of various novel high-energy-storage film capacitors. The method provided by the invention has the advantages of easily available formula raw materials,similar preparation process to film industrial production, environmental friendliness, no pollution and the like. The dielectric film can be widely applied to the fields of state grid engineering, electronic products, new energy vehicles, electromagnetic catapult pulse devices and the like in the future.

Description

technical field [0001] This article relates to new materials for high-energy storage film capacitors in the field of new energy, especially a dielectric film and its preparation method and film capacitors. Background technique [0002] With the continuous increase of energy demand and the continuous consumption of fossil fuels, the problems of improving the efficiency of traditional energy utilization and expanding the use of new energy have become increasingly prominent. Energy storage capacitors have the advantages of high energy storage density, fast charge and discharge speed, anti-cycle aging, suitable for extreme environments such as high temperature and high pressure, and stable performance. They meet the requirements of energy utilization in the new era and play an increasingly important role in power and electronic systems. more important role. With the development of material science, energy storage capacitors still have a lot of room for development. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L23/12C08L27/16C08L51/06C08L55/02C08L23/06H01G4/33
CPCC08J5/18C08J2323/06C08J2323/12C08J2327/16C08J2427/16C08J2451/06C08J2455/02H01G4/33
Inventor 党智敏郑明胜
Owner TSINGHUA UNIV
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