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Preparation method of ultra-thin high-temperature-resistant capacitor film applied to capacitors of electric and hybrid vehicles

A technology for hybrid electric vehicles and capacitors, which is applied to fixed capacitor dielectrics, capacitors, fixed capacitors, etc., can solve the problems of immature high temperature resistant polypropylene capacitor film technology, high temperature resistance performance that cannot meet the requirements of use, and inability to stabilize mass production. , to achieve the effect of low ash content, small thermal shrinkage, and improved film formation

Active Publication Date: 2016-09-14
NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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Problems solved by technology

The production level of metallized polypropylene film capacitors in my country has made great achievements. At present, the thickness of high-temperature-resistant polypropylene capacitor films produced by domestic manufacturers in batches is 3.5-15 μm, but the technology of 2-3 μm high-temperature-resistant polypropylene capacitor films is still immature. , the main problems are poor film formation, unsatisfactory thickness uniformity, low output rate, high cost, inability to stabilize mass production, and high temperature resistance cannot meet the requirements of use; the maximum working environment temperature of ordinary polypropylene film capacitors is 85 ℃, as the working time of the capacitor wound with ordinary polypropylene capacitor film increases, its internal temperature rises rapidly, which leads to a sharp decline in the stability of the capacitor, and even causes the capacitor to fail

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  • Preparation method of ultra-thin high-temperature-resistant capacitor film applied to capacitors of electric and hybrid vehicles

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Embodiment 1

[0027] 1) Raw material preparation: adopt the polypropylene granules of the model HC318BF produced by BOREALLSPOLYMERS. It is required that the isotacticity of the polypropylene raw material (tacticity polymer accounts for the percentage of all polymers) is more than 99%, and the ash content is less than 15ppm. Melt index 3.2-3.7g / 10min, molecular weight distribution coefficient 4.5-5.5 (under humidity 70%, temperature below 35 ℃, dark storage);

[0028] 2) Extrusion by extruder: Put the raw materials in step (1) into the extruder, and the raw materials are melted through the feeding section with a temperature of 230-235°C, the melting section with a temperature of 250-255°C, and the homogenization section with a temperature of 255-260°C Plasticize, then go to the metering pump, pass through the fine filter (the pore size of the filter screen is required to be 15μm), and then extrude through the extruder die (die temperature 230-240°C); the P2 pressure control of the extrusion ...

Embodiment 2

[0037] 1) Raw material preparation: adopt the polypropylene granules of the model HC318BF produced by BOREALLSPOLYMERS. It is required that the isotacticity of the polypropylene raw material (tacticity polymer accounts for the percentage of all polymers) is more than 99%, and the ash content is less than 15ppm. Melt index 3.2-3.7g / 10min, molecular weight distribution coefficient 4.5-5.5 (under humidity 70%, temperature below 35 ℃, dark storage);

[0038] 2) Extrusion by extruder: Put the raw materials in step (1) into the extruder, and the raw materials are melted through the feeding section with a temperature of 240-245°C, the melting section with a temperature of 255-260°C, and the homogenization section with a temperature of 255-260°C Plasticize, then go to the metering pump, pass through the fine filter (the filter screen aperture requires 15μm), and then extrude through the extruder die (die temperature 250-255°C); the pressure of the extrusion system is 65- 70bar (1bar=0...

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Abstract

The invention discloses a preparation method of an ultrathin high-temperature resistant capacitance film applied to capacitors of power-driven and hybrid electric vehicles. The preparation method comprises the steps of throwing polypropylene into an extruder to perform melt extrusion, wherein the isotacticity of the polypropylene is higher than 99 percent, ash content is smaller than 15ppm, a melt index ranges from 3.2g / 10min to 3.7g / 10min, and a molecular weight distribution coefficient ranges from 4.5 to 5.5; drawing the polypropylene subjected to melt extrusion to a chilling roller with the temperature of 85 DEG C-100 DEG C to perform cooling forming to obtain a cast piece; performing longitudinal extension, transverse extension, thickness measurement, corona, primary aging treatment and second aging treatment on the cast piece to obtain the capacitance film. The ultrathin high-temperature resistant capacitance film has the advantages of being ultrathin, good in thickness uniformity, resistant to high temperature, good in film-forming property, excellent in mechanical performance and electric performance and capable of being applied to capacitors of power-driven and hybrid electric vehicles.

Description

technical field [0001] The invention belongs to the technical field of polypropylene capacitor films, and in particular relates to a method for preparing an ultra-thin (2-3 μm in thickness) high-temperature-resistant (above 110° C.) capacitor film applied to capacitors of electric and hybrid vehicles. technical background [0002] With the rapid development of science and technology, the automobile manufacturing industry has achieved unprecedented results, and the comprehensive innovation of technology has brought a high-speed growth market for electronic components, especially the increasing demand for ultra-thin high-temperature resistant polypropylene film capacitors. With the improvement of propylene capacitor film technology and the development of ultra-thin, ultra-thin high-temperature resistant polypropylene film capacitors have begun to be used in electric and hybrid vehicles. In the "12th Five-Year Plan", the national government vigorously advocates energy conservat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/00H01G4/06
Inventor 黄剑鹏崔云振
Owner NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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