Polypropylene film insulation characteristic improving method based on crystal morphology regulation and control

A polypropylene film and polypropylene technology, applied in the field of polypropylene film, can solve the problems that threaten the safe and stable operation of the DC transmission system, break the microstructure of the molecular chain, and generate electrical weaknesses, so as to avoid insulation failures, improve the microstructure, The effect of improving reliability
CN112873670AActive Publication Date: 2021-06-01TIANJIN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2021-06-01

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Abstract

A polypropylene film insulation characteristic improving method based on crystal morphology regulation and control comprises the following steps that polypropylene master batch is fully mixed with a nucleating agent by using a double-roller machine to obtain a mixture with the nucleating agent content of 0-0.05% in percentage by mass; the mixture is melted by adopting a press vulcanizer; hot-pressing shaping is conducted on the molten mixture, specifically, the temperature of the press vulcanizer is slowly reduced from 185 DEG C-195 DEG C to 100 DEG C-140 DEG C; and after hot-pressing shaping is completed, a polypropylene / nucleating agent composite film is taken out, and the film is naturally cooled to 25 DEG C in air to obtain the modified polypropylene film. According to the polypropylene film insulation characteristic improving method based on crystal morphology regulation and control, the crystallization process of the polypropylene film can be regulated and controlled, the crystallinity and density of the micron-sized polypropylene film are increased, the microscopic crystal region of the polypropylene film is perfected by improving the microstructure and optimizing the microstructure, carrier migration is limited, the insulation performance of the film is improved, the insulation failure fault is avoided, and reliability of a direct-current transmission system is improved.
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Description

technical field

[0001] The present invention relates to a polypropylene film. In particular, it relates to a method for improving the insulation properties of polypropylene films based on crystal morphology regulation. Background technique

[0002] High-voltage DC metallized film capacitors play the role of filtering, voltage support, voltage equalization and damping in converter stations, and are the core equipment for smart grids and new energy power generation. Polypropylene is the main insulating medium of capacitors. As the voltage level increases, the requirements for the withstand voltage level of polypropylene insulation for capacitors also gradually increase. In the actual operation process, under the combined action of the electric-thermal field, the microstructure of the polypropylene film will be damaged such as molecular chain breakage, resulting in electrical weakness, which may eventually cause insulation failure, thus threatening the safe and stable operatio...

Claims

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