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
CN103448254AActive Publication Date: 2013-12-18HUAWEI POLYIMIDE +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI POLYIMIDE
Publication Date
2013-12-18

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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.
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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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