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A kind of high dielectric constant polypropylene/ceramic composite material for film capacitor and preparation method thereof

A ceramic composite material, high dielectric constant technology, applied in the field of high dielectric constant polypropylene/ceramic composite material for film capacitors and its preparation, can solve the problem of inability to cast film, complex composition, low breakdown field strength, etc. question

Active Publication Date: 2021-08-20
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the obvious problems such as complex composition of composite materials for film capacitors in the prior art, low breakdown field strength and inability to cast films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Composite material composition: 38g polypropylene, 2g strontium titanate; the isotacticity of polypropylene is 96%, and the particle size of strontium titanate is 180nm.

[0027] Preparation:

[0028] (1) Melt the polypropylene in banburying, the banburying temperature is 180°C, the stirring speed is 60r / min, and the banburying time is 5min;

[0029] (2) Add ceramic powder and knead, the kneading temperature is 180°C, the stirring speed is 60r / min, and the kneading time is 10min;

[0030] (3) The composite material is obtained by hot pressing, the temperature of hot pressing is 220° C., and the pressure is 12 MPa.

[0031] After testing and evaluation, the dielectric constant of the above-mentioned polypropylene / ceramic composite material at room temperature is 2.5, and the dielectric loss is 4.3*10 -4 , using a spherical electrode (diameter 25 mm), the boost rate is 1 kV / s, and the DC breakdown field strength of the sample is measured to be 116 kV / mm.

Embodiment 2

[0033] Composite material composition: 36g polypropylene, 4g barium titanate; among them, the isotacticity of polypropylene is 97%, and the particle size of barium titanate is 150nm.

[0034] Preparation:

[0035] (1) Melt the polypropylene in banburying, the banburying temperature is 200°C, the stirring speed is 50r / min, and the banburying time is 8min;

[0036](2) Add ceramic powder and knead, the kneading temperature is 200°C, the stirring speed is 50r / min, and the kneading time is 12min;

[0037] (3) The composite material is obtained by hot pressing, the temperature of hot pressing is 210° C., and the pressure is 10 MPa.

[0038] After testing and evaluation, the dielectric constant of the above-mentioned polypropylene / ceramic composite material at room temperature is 3.5, and the dielectric loss is 4.6*10 -4 , using a spherical electrode (diameter 25 mm), the boost rate is 1 kV / s, and the DC breakdown field strength of the sample is measured to be 127 kV / mm.

Embodiment 3

[0040] Composite material composition: 36g polypropylene, 2g barium titanate and 2g strontium titanate; the isotacticity of polypropylene is 97%, and the particle size of barium titanate and strontium titanate is 150nm.

[0041] Preparation:

[0042] (1) Melt the polypropylene in banburying, the banburying temperature is 200°C, the stirring speed is 50r / min, and the banburying time is 8min;

[0043] (2) Add evenly mixed ceramic powder and knead, the kneading temperature is 200°C, the stirring speed is 50r / min, and the kneading time is 12min;

[0044] (3) The composite material is obtained by hot pressing, the temperature of hot pressing is 210° C., and the pressure is 10 MPa.

[0045] After testing and evaluation, the dielectric constant of the above-mentioned polypropylene / ceramic composite material at room temperature is 4.0, and the dielectric loss is 3.9*10 -4 , using a spherical electrode (diameter 25 mm), the boost rate is 1 kV / s, and the DC breakdown field strength of...

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Abstract

The invention belongs to the technical field of dielectric thin film materials, and in particular relates to a high dielectric constant polypropylene / ceramic composite material for film capacitors and a preparation method thereof. The composite material is composed of polypropylene with a mass percentage of 90.0-95.0%, Consists of 5.0‑10.0% ceramic powder. The invention utilizes the high dielectric performance of the ceramic powder to increase the dielectric constant of the polypropylene material for film capacitors, thereby providing technical support for the preparation of new materials for film capacitors with excellent dielectric properties and suitable for high-efficiency energy storage density.

Description

technical field [0001] The invention belongs to the technical field of dielectric thin film materials, and in particular relates to a high dielectric constant polypropylene / ceramic composite material for film capacitors and a preparation method thereof. Background technique [0002] UHV DC transmission and flexible DC grid are effective technical means to solve the problems of renewable energy acceptance, long-distance and large-scale power transmission, and the shortage of transmission corridors. They are the basic form of the future grid. Film capacitor is an important supporting core device for flexible DC power transmission, and its dielectric properties and withstand voltage level are directly related to the reliable operation of flexible DC converter valves. The high dielectric properties of dielectric materials directly affect the capacitance and energy storage density of capacitors. The development of a new material for thin film dielectric capacitors with excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K3/24C08J5/18
CPCC08J5/18C08J2323/12C08K3/24C08L23/12
Inventor 肖雨张翀邢照亮杨威王佳伟张嘉王亚臣
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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