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Biaxially-oriented polypropylene capacitance film resisting high temperature and preparation method thereof

A technology of biaxial stretching and polypropylene, applied in the field of BOPP insulating film and its preparation, can solve the problems of unfavorable performance of PP capacitor film, achieve high industrial application value, improve heat resistance and breakdown strength, and be simple and easy to realize Effect

Active Publication Date: 2013-12-18
HUAWEI POLYIMIDE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is recognized in the prior art that UV irradiation crosslinking is not suitable for the preparation of PP capacitor films, and the degradation reaction of PP during UV irradiation is extremely detrimental to the film properties of PP capacitor films.

Method used

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  • Biaxially-oriented polypropylene capacitance film resisting high temperature and preparation method thereof
  • Biaxially-oriented polypropylene capacitance film resisting high temperature and preparation method thereof
  • Biaxially-oriented polypropylene capacitance film resisting high temperature and preparation method thereof

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Embodiment Construction

[0020] In one embodiment of the present invention, in the polypropylene raw material composition in step (1), the polypropylene resin adopts an isotacticity of 96%-97%, a melt flow index of 2.1-3.5g / 10min, a molecular weight distribution of Mw / Mn=7~9, polypropylene resin with ash content of 10ppm~20ppm. Test the melt flow index according to GB / T3682-2000 and ASTM D1238-98 standards. Put the raw material to be tested into a small tank, and a thin tube is connected at the end of the tank. The diameter of the thin tube is 2.095mm, and the length of the tube is 8mm. Heating to 190°C, under the pressure of 2.16kg weight applied to the upper end of the raw material, measure the extruded weight of the raw material within 10 minutes, which is the flow index of the plastic, and the unit is g / 10min.

[0021] In one embodiment of the present invention, in the polypropylene raw material composition in step (1), the photoinitiator is a benzil derivative such as diphenyl ethylene diketone o...

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Abstract

The invention discloses a preparation method of a polypropylene capacitance film. The preparation method comprises the following steps of: (1) preparing a polypropylene material composite from the following components in parts by weight: 100 parts of polypropylene resin, 0.05-0.15 part of a photoinitiator, 3-5 parts of a cross-linking agent and 0.25-0.35 part of a hindered phenol antioxidant; (2) melting, plasticizing and extruding the polypropylene material composite by an extruder; (3) cooling a extruded melt body and casting into a sheet; (4) stretching the cast sheet in two directions into a film by using a bidirectional stretching equipment; (5) performing ultraviolet (UV) irradiation crosslinking on the stretched thin film; and (6) post-treating the irradiated thin film and reeling the thin film in a reeling machine to obtain a finished product. According to the preparation method of the UV crosslinked BOPP (biaxially-oriented polypropylene) capacitance film, the heat resistance and the breakdown strength of the polypropylene capacitance film are remarkably enhanced, the polypropylene capacitance film can meet the development demands of a strong-current capacitor market on advanced insulating thin film materials, and a new path is opened for high performance of the polypropylene capacitance film. Meanwhile the method is simple and easy to realize and has an extremely high industrial application value.

Description

technical field [0001] The invention relates to a method for manufacturing a polypropylene film, in particular to a BOPP insulating film with high temperature resistance and high breakdown voltage for a high-voltage capacitor and a preparation method thereof. Background technique [0002] Due to the lack of any kind of polar groups oriented under electric field stress in the molecular chain, polypropylene (PP) has the advantages of low dielectric loss and excellent electrical insulation, and the biaxially oriented polypropylene film (BOPP) prepared from it is It is an ideal material for high-voltage power capacitors and low-voltage electronic capacitors, and has been widely used in the field of capacitors. However, with the advancement of science and technology, electrical devices and electrical components continue to develop in the direction of miniaturization and densification. Normal use in equipment strongly requires that BOPP film capacitors must withstand extreme cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C47/92B29C55/12B29C71/04C08L23/12C08K5/13B29L7/00B29C48/92
CPCB29C48/08
Inventor 陈凤李晓敏黄渝鸿韩青霞曹君李涛杨帆袁彬彬阳龑
Owner HUAWEI POLYIMIDE
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