High temperature resistant polypropylene capactive film and production thereof

A production method and technology of polypropylene, applied in the direction of capacitors, capacitor manufacturing, fixed capacitor parts, etc., can solve the problems of low tensile strength, easy breakdown of capacitors, and decrease in capacitor capacity, and achieve high tensile strength and perfect The effect of internal microstructure

Inactive Publication Date: 2006-04-12
南通百正电子新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing polypropylene capacitor film, due to its internal microstructure and other reasons, due to the relatively large transverse heat shrinkage rate, in the process of making and using metallized capacitors, the connection between the metal layers at both ends and the metal coating on the surface of the film is not good, causing the dielectric The loss tangent increases, and the temperature of the capacitor rises, which makes the capacitor easy to break down, and due to the serious lateral shrinkage, the capacity of the capacitor decreases; at the same time, the current products have relatively low voltage resistance, low tensile strength, and poor temperature resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The present invention will be further described below in conjunction with embodiment:

[0016] ①Extrusion and plasticization: Take electrical grade polypropylene raw materials, through a conventional vacuum suction system, and through a metal detector, they are sucked into the hopper above the extruder, and then the above polypropylene raw materials are heated and melted by the extruder, and extruded Form a viscous fluid melt with uniform melting;

[0017] ② Filtration: Use 15-40μ (Example 15, 20, 30, 40μ) candle filter to filter the melt, and filter out the mechanical impurities and unmelted materials in the viscous liquid melt;

[0018] ③ Die head shaping: pass the filtered melt through the die head, the temperature of the die head is 230-260°C (can be 230, 240, 250, 260°C), forming a flake melt;

[0019] ④Cooling and forming: the flake melt is cooled and shaped by chilling rollers with a temperature of 50-100°C (can be 50, 70, 85, 100°C) to form a thick sheet contai...

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PUM

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Abstract

A polypropylene capacity film in high temperature resistance has lateral thermal contraction rate <=0.2%, lateral tensile strength >=160 MPa and wetting tension >=37 mN / m when it has been placed at 120 deg.C for ten minutes and it can be produced with the process of extruding and plasticizing, filtering, model head setting, cooling for forming, longitudinal preheating tensile setting and lateral preheating tensile setting.

Description

Technical field: [0001] The invention relates to a capacitance film and a production process. Background technique: [0002] The existing polypropylene capacitor film, due to its internal microstructure and other reasons, due to the relatively large transverse heat shrinkage rate, in the process of making and using metallized capacitors, the connection between the metal layers at both ends and the metal coating on the surface of the film is not good, causing the dielectric The loss tangent increases, and the temperature of the capacitor rises, which makes the capacitor easy to break down, and due to the serious lateral shrinkage, the capacity of the capacitor decreases; at the same time, the current products have relatively low voltage resistance, low tensile strength, and poor temperature resistance. . Invention content: [0003] The object of the present invention is to provide a high temperature resistant polypropylene capacitor film with good thermal stability, high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/002H01G4/14H01G13/00
Inventor 郑立平刘晓东吉亚兵
Owner 南通百正电子新材料股份有限公司
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