Polypropylene capacitor film with high breakdown voltage

A high breakdown voltage, capacitor film technology, applied in the field of capacitor film, can solve the problems of difficulty in obtaining BOPP film, inability to meet oil immersion, poor compatibility, etc.

Pending Publication Date: 2022-02-08
ANHUI FEIDA ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the surface roughness is small and the porosity is small, although the breakdown voltage is increased, it cannot meet the needs of oil immersion in capacitor manufacturing; when the surface roughness is large and the porosity is large, although it can meet the needs of oil immersion in capacitor manufacturing , but the breakdown voltage of the capacitor will decrease, and the electrical weakness will increase. Therefore, the two performance indicators of the polypropylene capacitor film need to achieve a balance (that is, the breakdown voltage and surface roughness meet the performance indicators required by the capacitor at the same time)
[0004] Prior art CN102049859A discloses a BOPP film production technology for multi-layer composite structure capacitors, by layering raw materials with high crystallinity of α crystal form and raw materials with high crystallinity of β crystal form to obtain rough surface and high withstand voltage BOPP film, but the compatibility of the above two raw materials is poor, it is difficult to obtain the BOPP film with this ideal effect in actual production

Method used

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  • Polypropylene capacitor film with high breakdown voltage
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Experimental program
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Effect test

Embodiment 1

[0025] This embodiment proposes a polypropylene capacitor film with high breakdown voltage, which is prepared by the following method:

[0026] Heat polypropylene with an isotacticity of 98.5%, an ash content of 20ppm, and a melt index of 3.1g / 10min (according to GB / T3682-2000 standard test) to 140°C and keep it warm for 15min. After cooling to room temperature, pre-crystallization is obtained. Polypropylene; the β-nucleating agent (5,12-dihydro-quinolino[2,3-b]acridine-7,14-dione of the pre-crystallized polypropylene and polypropylene mass 0.1%) ) is added into a twin-screw extruder, and melted and extruded by the extruder, and the extrusion temperature is controlled at 250° C. to obtain a sheet-like melt;

[0027] The resulting flake melt is cooled by the cooling roll and the casting air knife. The temperature of the cooling roll is controlled at 100°C, and the gas temperature of the casting air knife is consistent with that of the cooling roll. The biaxial stretching equip...

Embodiment 2

[0029] This embodiment proposes a polypropylene capacitor film with high breakdown voltage, which is prepared by the following method:

[0030] Heat polypropylene with an isotacticity of 98.5%, an ash content of 20ppm, and a melt index of 3.1g / 10min (according to GB / T3682-2000 standard test) to 130°C and keep it warm for 20min. After cooling to room temperature, pre-crystallization is obtained. The polypropylene; the β-nucleating agent (5,12-dihydro-quinolino[2,3-b]acridine-7,14-dione of the pre-crystallized polypropylene and polypropylene mass 0.05%) ) is added into a twin-screw extruder, and melted and extruded by the extruder, and the extrusion temperature is controlled at 260° C. to obtain a sheet-like melt;

[0031] The obtained flake melt is cooled by the cooling roll and the casting air knife. The temperature of the cooling roll is controlled at 105°C, and the gas temperature of the casting air knife is consistent with that of the cooling roll. The biaxial stretching e...

Embodiment 3

[0033] This embodiment proposes a polypropylene capacitor film with high breakdown voltage, which is prepared by the following method:

[0034] Heat polypropylene with an isotacticity of 98.5%, an ash content of 20ppm, and a melt index of 3.1g / 10min (according to GB / T3682-2000 standard test) to 150°C and keep it warm for 5min. After cooling to room temperature, pre-crystallization is obtained. Polypropylene; the β-nucleating agent (5,12-dihydro-quinolino[2,3-b]acridine-7,14-dione of the pre-crystallized polypropylene and polypropylene mass 1%) ) into a twin-screw extruder, melted and extruded using the extruder, and the extrusion temperature is controlled at 240°C to obtain a sheet-like melt;

[0035] The resulting flake melt is cooled by the cooling roll and the casting air knife. The temperature of the cooling roll is controlled at 100°C, and the gas temperature of the casting air knife is consistent with that of the cooling roll. The biaxial stretching equipment carries ou...

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Abstract

The invention discloses a polypropylene capacitor film with high breakdown voltage, which is obtained by blending and extruding raw materials including isotatic polypropylene and a beta-nucleating agent through an extruder and then synchronously conducting stretching through two-way stretching equipment. The isotactic polypropylene is subjected to pre-crystallization treatment before being subjected to blending extrusion through an extruder. The polypropylene capacitor film provided by the invention has high oil immersion property and high voltage resistance.

Description

technical field [0001] The invention belongs to the field of capacitor films, in particular to a polypropylene capacitor film with high breakdown voltage. Background technique [0002] The main raw materials of film capacitors are capacitor films, metal materials, resin materials, lead wires and tab materials, and shell materials. Among them, capacitor films account for about 2 / 3 of the total cost of all raw materials. Among them, polypropylene capacitor films are the most common. . Polypropylene capacitor film is generally prepared by biaxial stretching process, which has high requirements on the quality of raw materials, and the quality of raw materials directly affects the quality of capacitor film and capacitors. Therefore, in the BOPP film industry, capacitor films have higher added value than ordinary packaging films, and their raw material prices are relatively higher. [0003] High and low voltage power capacitors require the polypropylene capacitor film not only t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/3437C08J5/18H01G4/33
CPCC08J5/18H01G4/33C08J2323/12C08K5/3437
Inventor 华玲萍胡忠胜王汝文谢成余淼
Owner ANHUI FEIDA ELECTRICAL TECH CO LTD
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