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

Active Publication Date: 2021-06-01
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 operation of the entire DC transmission system.

Method used

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

Examples

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Effect test

example 1

[0029] 1 Use a twin-roller to fully mix the polypropylene masterbatch with 2,2'-methylene-bis(4,6-di-tert-butylphenyl)sodium phosphate (trade name: Irgastab NA-11) nucleating agent, The content is 0.01% (mass fraction), the mixing temperature is 190° C., and the mixing time is 10 minutes.

[0030] 2 Use a flat vulcanizer to melt the mixture, the melting temperature is 190°C, and the melting time is 5 minutes.

[0031] 3 After that, heat press the mixture. Decrease the temperature of the flat vulcanizer from 190°C to 120°C, keep the pressure at 30MPa during this process, and take 25 minutes for the cooling process.

[0032] 4 After the hot pressing is completed, take out the polypropylene / nucleating agent composite film pattern, and cool it down to 25°C naturally in the air.

example 2

[0034] 1 Use a twin-roller to fully mix the polypropylene masterbatch with 2,2'-methylene-bis(4,6-di-tert-butylphenyl)hydroxyaluminum phosphate (trade name: ADK NA-21) nucleating agent , the content is 0.03% (mass fraction), the mixing temperature is 185° C., and the mixing time is 12 minutes.

[0035] 2 Use a flat vulcanizer to melt the mixture, the melting temperature is 185°C, and the melting time is 5 minutes.

[0036] 3 After that, heat press the mixture. Decrease the temperature of the flat vulcanizer from 185°C to 100°C, keep the pressure at 35MPa during this process, and take 20 minutes for the cooling process.

[0037] 4 After the hot pressing is completed, take out the polypropylene / nucleating agent composite film pattern, and cool it down to 25°C naturally in the air.

example 3

[0039] 1 Use a twin-roller to mix the polypropylene masterbatch with bis[2,2′-methylene-bis-(4,6-di-tert-butylphenoxy)phosphate] hydroxyaluminum (trade name: HBP) ​​nucleating agent Mix well, the content is 0.05% (mass fraction), the mixing temperature is 195°C, and the mixing time is 15 minutes.

[0040] 2 Use a flat vulcanizer to melt the mixture, the melting temperature is 195°C, and the melting time is 5 minutes.

[0041] 3 After that, heat press the mixture. Decrease the temperature of the flat vulcanizer from 195°C to 140°C, keep the pressure at 40MPa during this process, and take 40 minutes for the cooling process.

[0042] 4 After the hot pressing is completed, take out the polypropylene / nucleating agent composite film pattern, and cool it down to 25°C naturally in the air.

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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.

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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Application Information

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IPC IPC(8): B29C43/02B29C43/34B29C43/52B29L7/00
CPCB29C43/02B29C43/34B29C43/52B29L2007/00Y02E60/60
Inventor 肖萌冉昭玉杜伯学许然然刘浩梁邢继文范凯伦
Owner TIANJIN UNIV
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