A high temperature resistant biaxially stretched polypropylene capacitor film and its manufacturing method
A polypropylene, capacitor film technology, used in flat products, other household appliances, applications, etc., can solve the problems of unfavorable performance of PP capacitor film, achieve high industrial application value, simple and easy to implement, improve heat resistance and shock resistance. The effect of wear strength
Active Publication Date: 2016-03-09
HUAWEI POLYIMIDE +1
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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.
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[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 ASTMD1238-98 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 or...
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Abstract
A method for preparing a polypropylene capacitor film, comprising the following steps: (1) preparing a polypropylene raw material composition in the following proportions by weight: 100 parts of polypropylene resin, 0.05-0.15 parts of photoinitiator, and 3-5 parts of crosslinking agent , the hindered phenolic antioxidant is 0.25-0.35 parts; (2) The polypropylene raw material composition is melted and plasticized and extruded through an extruder; (3) The extruded melt is cooled and cast; Stretching equipment stretches to form a film; (5) The stretched film is cross-linked by ultraviolet (UV) radiation; (6) The irradiated film is post-treated and enters the winder for winding to obtain the finished product. The UV cross-linked biaxially oriented polypropylene (BOPP) capacitor film preparation method provided by the present invention significantly improves the heat resistance and breakdown strength of the polypropylene capacitor film, so that it can meet the requirements of high-end insulating film materials in the strong electric capacitor market. The development needs of the industry have opened up a new path for realizing the high performance of the polypropylene capacitor film. Simultaneously, the method is simple and easy to implement, and has 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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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