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Method for Improving AC Flashover Voltage of Polyimide Film

A technology of polyimide film and flashover voltage, which is applied in the direction of circuits, electrical components, insulators, etc., can solve the problem that the insulation performance of polyimide cannot meet the requirements, so as to reduce the secondary electron emission coefficient and realize Simple, low tool cost effect

Active Publication Date: 2017-04-12
CHONGQING UNIV
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Problems solved by technology

However, in some occasions with higher voltage levels, the surface insulation performance of polyimide is not up to the requirements. Therefore, in order to suppress the surface insulation failure of polyimide, it is necessary to improve the flashover performance of polyimide

Method used

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  • Method for Improving AC Flashover Voltage of Polyimide Film
  • Method for Improving AC Flashover Voltage of Polyimide Film
  • Method for Improving AC Flashover Voltage of Polyimide Film

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Embodiment Construction

[0015] In order to make the objectives, technical solutions and advantages of the present invention clearer, the specific embodiments of the present invention will be further described in detail below.

[0016] The method for increasing the AC flashover voltage of a polyimide film includes the following steps:

[0017] 1) Cut the polyimide film into 7cm×2cm strips, wash with deionized water and n-propanol alternately for 5-10 times, then use an ultrasonic cleaner for cleaning, then rinse with deionized water, and place them in parallel. It was dried in a vacuum drying oven, and the drying time was 12 hours at a temperature of 40° C. in the vacuum drying oven.

[0018] 2) Use 120-grit sandpaper to orient the polyimide film for 5-10 minutes. The grinding frequency is about 10-15 times per minute. The sanding direction should be perpendicular to the direction of the flashover field strength.

[0019] 3) The polished polyimide is cleaned and dried in a vacuum drying oven, and the...

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Abstract

The invention belongs to the technical field of engineering dielectrics and electric engineering, and particularly relates to a method for improving flashover voltage of polyimide. The method comprises the following steps: (1) cleaning and drying a polyimide film; (2) polishing the polyimide film; and (3) cleaning the polished polyimide and carrying out drying in a vacuum drying oven. The technical scheme provided by the invention is simple to implement; the required tool is low in cost; the method has good practicability; special equipment and a special treatment condition are not needed; the method can be realized by simple mechanical sanding; and the repeatability is high. Through a surface sanding method, the creepage distance can be effectively improved by a valley formed in the material surface; formation of a discharge channel is hindered; a secondary electron emission coefficient is reduced; and the flashover voltage of the material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of engineering dielectrics and electrical engineering, and particularly relates to a method for increasing the flashover voltage of polyimide. Background technique [0002] Polyimide is a high molecular polymer material with excellent properties. It has excellent high and low temperature resistance, dielectric properties, very stable mechanical and mechanical properties in a wide temperature range, excellent chemical and physical stability and space radiation resistance, so it has been widely used in power electronics, aerospace, precision machinery and other fields. However, in some occasions with higher voltage levels, the creeping insulation performance of polyimide cannot meet the requirements. Therefore, in order to suppress the failure of creeping insulation of polyimide, it is necessary to improve the flashover performance of polyimide. SUMMARY OF THE INVENTION [0003] In view of this, the object...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B19/04
Inventor 王飞鹏张涛杨楠李剑杜林王有元陈伟根廖瑞金杨丽君姚陈果赵学童
Owner CHONGQING UNIV
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