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A Method for Effectively Improving Breakdown Field Strength of Biaxially Oriented Polypropylene Film

A technology of biaxial stretching and polypropylene film, which is applied in the field of capacitors and energy storage, can solve the problems that it is difficult to meet the continuous improvement of capacitor energy storage density or miniaturization, and the dielectric constant restricts the energy storage density. Strong and significant, good practicality and good controllability

Active Publication Date: 2020-08-18
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low dielectric constant of polypropylene restricts its energy storage density, making it difficult to meet the ever-increasing requirements for capacitor energy storage density or miniaturization

Method used

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  • A Method for Effectively Improving Breakdown Field Strength of Biaxially Oriented Polypropylene Film
  • A Method for Effectively Improving Breakdown Field Strength of Biaxially Oriented Polypropylene Film
  • A Method for Effectively Improving Breakdown Field Strength of Biaxially Oriented Polypropylene Film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The fluorination treatment conditions of BOPP film: the temperature of the closed reaction chamber is 10°C, the pressure is 0.5 bar, the volume percentage of fluorine gas in the reactive mixed gas is 15%, and the fluorination treatment time is 24h.

[0037] The results are shown in Table 1. The thickness of the fluorinated layer of the surface fluorinated BOPP film is 0.54 μm, and its average breakdown strength and storage energy density are increased by 28.9% and 66.2% respectively compared with those before fluorination.

Embodiment 2

[0039] The fluorination treatment conditions of BOPP film: the temperature of the closed reaction chamber is 25°C, the pressure is 0.1bar, the volume percentage of fluorine gas in the reactive mixed gas is 50%, and the fluorination treatment time is 12h.

[0040] The results are shown in Table 1. The thickness of the fluorinated layer of the surface fluorinated BOPP film is 0.62 μm, and its average breakdown strength and storage energy density are respectively increased by 23.9% and 53.5% compared with those before fluorination.

Embodiment 3

[0042] The fluorination treatment conditions of BOPP film: the temperature of the closed reaction chamber is 30°C, the pressure is 0.3bar, the volume percentage of fluorine gas in the reactive mixed gas is 20%, and the fluorination treatment time is 4h.

[0043] The results are shown in Table 1. The thickness of the fluorinated layer of the surface fluorinated BOPP film is 0.65 μm, and its average breakdown strength and storage energy density are respectively increased by 22.1% and 49.1% compared with those before fluorination.

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Abstract

The invention relates to a method for effectively improving the breakdown field strength of a biaxially oriented polypropylene film, which comprises the following step of: performing surface fluorination treatment on the biaxially oriented polypropylene film by using fluorine-containing mixed gas in a closed reaction chamber to improve the breakdown field strength of the biaxially oriented polypropylene film. Compared with the prior art, the method is simple in technological process, low in economic cost, remarkable in improvement of breakdown field intensity, capable of uniformly modifying BOPP films of any size in batches, and particularly suitable for commercial application.

Description

technical field [0001] The invention relates to a method for effectively improving the breakdown field strength of a biaxially stretched polypropylene film, specifically performing surface fluorination modification on a biaxially stretched polypropylene (BOPP) film, and belongs to the technical field of capacitors and energy storage. Background technique [0002] Capacitors play the role of filtering harmonics and realizing reactive power compensation in AC power transmission and distribution systems. In addition to being used for filtering in high-voltage direct current transmission systems, capacitors also play the role of voltage support. In addition, capacitors are also indispensable as energy storage devices for the utilization and management of renewable energy, electric vehicles, pulse power devices, and electromagnetic weapons. No matter what kind of capacitor is used, people always hope that it has a high withstand voltage or dielectric strength, a long service life...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08L23/12
CPCC08J7/126C08J2323/12
Inventor 安振连陈炜俊邢照亮张翀张卓姚俊兰高文健陈康
Owner TONGJI UNIV