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Method for improving high-temperature breakdown performance of polypropylene film of capacitor

A polypropylene film and capacitor technology, used in flat products, household appliances, other household appliances, etc., can solve the problems of capacitor bulging, explosion, and increased conductivity loss.

Pending Publication Date: 2022-03-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stable operating temperature of polypropylene is only 85°C. Under high temperature environment, the breakdown strength of polypropylene film drops sharply, and the conductance loss rises sharply, which may easily cause failures such as capacitor bulging and explosion, threatening the safe operation of power electronic equipment.

Method used

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  • Method for improving high-temperature breakdown performance of polypropylene film of capacitor
  • Method for improving high-temperature breakdown performance of polypropylene film of capacitor
  • Method for improving high-temperature breakdown performance of polypropylene film of capacitor

Examples

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Effect test

Embodiment 1

[0033] A method for improving the high-temperature breakdown performance of a capacitor polypropylene film, comprising the following steps:

[0034] (1) Put the cycloolefin copolymer particles with a glass transition temperature of 110°C in an oven to dry at a drying temperature of 70°C and a drying time of 30 minutes to remove the moisture in the material;

[0035] (2) Mix the dried cyclic olefin copolymer and polypropylene on a two-roller machine, the mass fraction of the cyclic olefin copolymer is 10%, the mixing temperature is 190°C, and the mixing time is 10 minutes;

[0036] (3) Put the mixture of polypropylene and cyclic olefin copolymer on a flat vulcanizing machine for hot pressing and setting, the setting time is 5min, the setting temperature is 190°C, and the pressure is 24MPa;

[0037] (4) Keep the pressure at 24MPa, and use a cooling device to cool the temperature from 190°C to 120°C;

[0038] (5) After the cooling is completed, take out the cycloolefin copolymer...

Embodiment 2

[0040] A method for improving the high-temperature breakdown performance of a capacitor polypropylene film, comprising the following steps:

[0041] (1) Put the cycloolefin copolymer particles with a glass transition temperature of 110°C in an oven to dry at a drying temperature of 70°C and a drying time of 30 minutes to remove the moisture in the material;

[0042] (2) Mix the dried cyclic olefin copolymer and polypropylene on a two-roller machine, the mass fraction of the cyclic olefin copolymer is 20%, the mixing temperature is 190°C, and the mixing time is 10 minutes;

[0043] (3) Put the mixture of polypropylene and cyclic olefin copolymer on a flat vulcanizing machine for hot pressing and setting, the setting time is 5min, the setting temperature is 190°C, and the pressure is 24MPa;

[0044] (4) Keep the pressure at 24MPa, and use a cooling device to cool the temperature from 190°C to 120°C;

[0045] (5) After the cooling is completed, take out the cycloolefin copolymer...

Embodiment 3

[0047] A method for improving the high-temperature breakdown performance of a capacitor polypropylene film, comprising the following steps:

[0048] (1) Put the cycloolefin copolymer particles with a glass transition temperature of 110°C in an oven to dry at a drying temperature of 70°C and a drying time of 30 minutes to remove the moisture in the material;

[0049] (2) Mix the dried cyclic olefin copolymer and polypropylene on a two-roller machine, the mass fraction of the cyclic olefin copolymer is 30%, the mixing temperature is 190°C, and the mixing time is 10 minutes;

[0050] (3) Put the mixture of polypropylene and cyclic olefin copolymer on a flat vulcanizing machine for hot pressing and setting, the setting time is 5min, the setting temperature is 190°C, and the pressure is 24MPa;

[0051] (4) Keep the pressure at 24MPa, and use a cooling device to cool the temperature from 190°C to 120°C;

[0052](5) After the cooling is completed, take out the cycloolefin copolymer ...

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Abstract

The invention discloses a method for improving the high-temperature breakdown performance of a polypropylene film of a capacitor, which comprises the following steps of: drying cycloolefin copolymer particles in an oven to remove moisture in the material; putting the dried cycloolefin copolymer and polypropylene on a double-roller machine for mixing; placing the mixture of the polypropylene and the cycloolefin copolymer on a press vulcanizer for hot pressing and shaping; a cooling device is used for cooling the temperature to 110-130 DEG C; and taking out the cycloolefin copolymer modified polypropylene film from the press vulcanizer, and cooling the film by using a cooling device. According to the method for improving the high-temperature breakdown performance of the capacitor polypropylene film, different addition amounts of the cycloolefin copolymer and the polypropylene are mixed, the compatibility of the cycloolefin copolymer and the polypropylene is improved, the microstructure of the film is regulated, the movement of a molecular chain in a high-temperature environment is inhibited, and the high-temperature breakdown performance of the capacitor polypropylene film is improved. The insulating property of the polypropylene film at high temperature is improved, the effect is good, the operation is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of metallized film capacitors, in particular to a method for improving the high-temperature breakdown performance of a capacitor polypropylene film. Background technique [0002] Due to the advantages of high breakdown field strength, low dielectric loss, high power density, and good self-healing properties, metallized film capacitors are the core components of high-voltage direct current transmission converter stations, electric vehicles, and high-power-density pulse power supplies. Polypropylene (PP) is currently the most widely used dielectric material in film capacitors. In recent years, with the development of power electronic equipment towards miniaturization and large capacity, the operating temperature of film capacitors has been rising continuously, reaching above 100°C. However, the stable operating temperature of polypropylene is only 85°C. Under high temperature environment, the breakdown streng...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L23/12C08L45/00B29B13/06B29C35/02B29D7/01
CPCC08J5/18B29D7/01B29B13/065B29C35/0288C08J2323/12C08J2445/00
Inventor 肖萌张梦蝶范凯伦杜伯学冉昭玉刘浩梁
Owner TIANJIN UNIV
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