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Preparation method of corona-treated polypropylene coarsened capacitor film

A corona treatment and polypropylene technology is applied in the field of preparation of corona treated polypropylene roughened capacitor films, which can solve the problems of poor heat dissipation, poor high temperature stability and high thermal shrinkage rate, and achieve stable performance of each phase and high thermal deformation temperature. , The effect of high temperature stability

Active Publication Date: 2012-06-20
NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the development requirements of miniaturization of electrical devices and densification of components, but due to the problem of poor heat dissipation due to miniaturization and densification of components, especially for capacitors used in AC circuits, it is necessary not only to suppress the internal heating of the capacitor itself, but also to Considering the ambient temperature used, if the temperature is too high (generally above 90°C), the stability of the capacitor will drop sharply, and even cause the capacitor to fail, which will bring serious safety hazards to the electrical machine, so increase the thickness to 2.8μm ~ 3.2μm The stability of polypropylene film capacitors in high temperature environments, so that the capacitors made of polypropylene films can work stably at higher temperatures is an important research project at present
Therefore, the polypropylene capacitor film produced by the corona-treated polypropylene roughened capacitor film of the prior art has high thermal shrinkage rate and poor performance stability at high temperature, that is, the problem of poor high temperature stability.

Method used

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  • Preparation method of corona-treated polypropylene coarsened capacitor film
  • Preparation method of corona-treated polypropylene coarsened capacitor film

Examples

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Embodiment 1

[0021] A preparation method for corona-treated polypropylene roughened capacitance film, it comprises the following steps:

[0022] 1) Selection and preparation of raw materials: Use polypropylene raw materials with isotacticity ≥ 99% and ash content less than 20ppm; and dry at 35°C for 10 hours in an environment with a humidity of 30% to 40%;

[0023] 2) Extrusion of cast sheet by extruder: put the polypropylene raw material treated in step 1) into the extruder to extrude into sheet melt, and the temperature of the extruder is 230°C;

[0024] 3) Chilling roll and air shower cooling: the flake melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain a thick sheet, and the temperature of the chilling roll is 95°C;

[0025] 4) Longitudinal stretching: preheat, stretch and shape the thick sheet obtained in step 3) in sequence. The preheating temperature is 100~140°C, the stretching temperature is 130~157°C, and the stretching ratio is 5.0~ 5.5, the...

Embodiment 2

[0033] A preparation method for corona-treated polypropylene roughened capacitance film, it comprises the following steps:

[0034] 1) Selection and preparation of raw materials: Use polypropylene raw materials with isotacticity ≥ 99% and ash content less than 20ppm; and dry at 45°C for 12 hours in an environment with a humidity of 30% to 40%;

[0035] 2) Extrusion of cast sheet by extruder: put the polypropylene raw material processed in step 1) into the extruder to extrude into sheet-like melt, and the temperature of the extruder is 240°C;

[0036] 3) Chilling roll and air shower cooling: the flake melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain a thick sheet, and the temperature of the chilling roll is 100°C;

[0037] 4) Longitudinal stretching: preheat, stretch and shape the thick sheet obtained in step 3) in sequence. The preheating temperature is 100~140°C, the stretching temperature is 130~157°C, and the stretching ratio is 5.0~ ...

Embodiment 3

[0045] A preparation method for corona-treated polypropylene roughened capacitance film, it comprises the following steps:

[0046] 1) Selection and preparation of raw materials: Use polypropylene raw materials with isotacticity ≥ 99% and ash content less than 20ppm; and dry for 20 hours at 35~45°C and humidity 30%~40%;

[0047] 2) Extrusion of cast sheet by extruder: put the polypropylene raw material processed in step 1) into the extruder to extrude into sheet melt, and the temperature of the extruder is 260°C;

[0048] 3) Chilling roll and air shower cooling: the flake melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain a thick sheet, and the temperature of the chilling roll is 110°C;

[0049] 4) Longitudinal stretching: preheat, stretch and shape the thick sheet obtained in step 3) in sequence. The preheating temperature is 100~140°C, the stretching temperature is 130~157°C, and the stretching ratio is 5.0~ 5.5, the setting temperature is...

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Abstract

The invention discloses a preparation method of a polypropylene capacitor film which allows double-sided metalization. The method comprises the following steps: (1) selecting and preparing raw materials; (2) extruding cast sheets through an extruder; (3) cooling with a chilling roll or an air shower; (4) performing longitudinal stretching; (5) performing lateral stretching; (6) measuring thickness, cutting edges and performing corona treatment; (7) rolling; (8) performing first aging treatment; (9) cutting, and (10) performing second aging treatment. Compared with the prior art, the polypropylene capacitor film prepared by the method has the characteristics of low hot shrinkage rate and stable performance at high temperature, namely good high-temperature stability.

Description

technical field [0001] The invention belongs to the field of capacitor film preparation, in particular to a method for preparing a corona-treated polypropylene roughened capacitor film with a thickness of 2.8 μm to 3.2 μm. Background technique [0002] Polypropylene capacitor film is biaxially oriented polypropylene film for capacitors. The abbreviation of biaxially oriented polypropylene film is BOPP, which is the abbreviation of the English name "Biaxially Oriented Polypropylene" of biaxially oriented polypropylene film. The corona-treated polypropylene roughened capacitor film is mainly used for metallized film, paper composite dielectric capacitor or full-film dielectric capacitor, code-named MRP. [0003] Biaxially oriented polypropylene film for capacitors has high mechanical and electrical properties. Compared with capacitors made of ordinary films, capacitors made of polypropylene films have low thermal shrinkage, stable performance, and high temperature resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C55/14B29C71/00
Inventor 黄剑鹏张永豪
Owner NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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