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Polypropylene film and film capacitor

A polypropylene film and breakdown voltage technology, applied in the field of polypropylene film, can solve the problems of low withstand voltage, low stretching ratio, unevenness, etc., achieve high withstand voltage and reliability, and suppress insulation breakdown voltage. , the effect of less insulation defects

Active Publication Date: 2017-04-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by adding long-chain branched polypropylene to the polypropylene resin with controlled molecular weight distribution, although an increase in the 125°C withstand voltage was observed, due to the low draw ratio and the high cooling and solidification temperature of the molten sheet, it formed during stretching. Voids originate from the crystallization transition from β crystal to α crystal, so the withstand voltage becomes lower depending on the measurement site, and there are many cases of inhomogeneity when viewed from the entire film. The improvement of withstand voltage and reliability is sufficient

Method used

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  • Polypropylene film and film capacitor
  • Polypropylene film and film capacitor

Examples

Experimental program
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Embodiment 1

[0164] With respect to 100 parts by mass of polypropylene resin polymerized with a Ziegler-Natta catalyst, having an isotactic pentad fraction of 0.98, a melting point of 167° C., and a melt flow rate (MFR) of 2.6 g / 10 minutes, Kneading and extruding was carried out with an extruder set at 240°C so that the concentration of "α crystal nucleating agent manufactured by Milliken; NX8000", which is a noni alcohol-based melting type nucleating agent, was 0.3 parts by mass, and the bar The solids were water-cooled and then fragmented as polypropylene resin raw material (B). As the polypropylene resin for layer A, with respect to 100 parts by mass of PP resin having an isotactic pentad fraction of 0.98, a melting point of 167° C., and a melt flow rate (MFR) of 2.6 g / 10 minutes, Kneading and extruding was carried out with an extruder set at 240° C. so that “silica particles with an average particle diameter of 0.3 μm manufactured by Denki Kagaku Kogyo Co., Ltd.: SFP-20MHE (silane coup...

Embodiment 2

[0166]A polypropylene film having a thickness of 2.2 μm was obtained in the same manner as in Example 1 except that the polypropylene resin of the B layer did not contain a melt-type nucleating agent. The characteristics and capacitor characteristics of the polypropylene film of this example are shown in Table 1, and the reliability as a capacitor is very excellent, and the withstand voltage is at a level that is not problematic in practical use.

Embodiment 3

[0168] Except having set the conditions of the heat treatment temperature after biaxial stretching to the conditions described in Table 1, it carried out similarly to Example 1, and obtained the polypropylene film. The characteristics and capacitor characteristics of the polypropylene film of this example are shown in Table 1, and both the withstand voltage and reliability as a capacitor are at levels that are not problematic in practical use.

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Abstract

A polypropylene film wherein, a percentage (125R%) calculated by measuring the dielectric breakdown voltage (V / [mu]m) of the film at 30 points in a 125 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 50%; and a percentage (23R%) calculated by measuring the dielectric breakdown voltage (V / [mu]m) of the film at 30 points in a 23 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 20%. The present invention relates to a polypropylene film having few insulation defects and minimal variance of dielectric breakdown voltage in high-temperature environments, and in particular there is provided a polypropylene film that exhibits high withstand voltage and reliability in high-voltage capacitor applications.

Description

technical field [0001] The present invention relates to a polypropylene film suitable for packaging, industrial use, etc., and more specifically, it relates to the use as a capacitor dielectric with less insulation defects and suppression of uneven dielectric breakdown voltage in high-temperature environments, especially for use in high-voltage capacitors A polypropylene film capable of exhibiting high withstand voltage and reliability. Background technique [0002] Polypropylene films are excellent in transparency, mechanical properties, electrical properties, etc., and thus are used in various applications such as packaging applications, tape applications, cable packaging, and electrical applications including capacitors. [0003] Among them, the use in capacitors is not limited to DC applications and AC applications because of its excellent withstand voltage characteristics and low loss characteristics, and it is particularly preferably used in high-voltage capacitors. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B32B27/32C08L23/12H01B3/00H01B3/44H01G4/18
CPCB32B27/32C08J5/18C08L23/12H01G4/18H01G4/33H01B3/441Y02T10/70
Inventor 今西康之大仓正寿冈田一马久万琢也
Owner TORAY IND INC
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