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A kind of high-performance ultra-thin polypropylene capacitor film and its manufacturing method

A technology of polypropylene capacitors and polypropylene, which is applied in the field of high-performance ultra-thin polypropylene capacitor film and its manufacturing, can solve the problems of difficult miniaturization of high-power capacitors, differences in mechanical strength, obvious bow effect, etc., to reduce heat Effect of shrinkage, low shrinkage, and improvement of thickness uniformity

Active Publication Date: 2016-05-04
永威(天津)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it adopts distributed stretching technology, and the thickness of the final film is 4.8 μm, which is difficult to further meet the miniaturization requirements of some special high-power capacitors, such as the film below 3.5 μm required by pure electric vehicles and hybrid vehicles.
In addition, the film produced by bidirectional stretching gradually has the problem of anisotropy in the two directions because it is difficult to crystallize orientation after longitudinal stretching crystallization orientation and then transverse stretching. The product bow effect is obvious and the mechanical strength is different.
Therefore, there is no polypropylene film for capacitors that satisfies the above-mentioned thinning, high temperature resistance, high pressure resistance and processing adaptability in the market so far.

Method used

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  • A kind of high-performance ultra-thin polypropylene capacitor film and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The polypropylene raw material whose isotacticity is greater than 98%, the ash content is less than 20ppm, and the melt index (MFI) is 2.6g / 10min is used. The raw materials are melted and plasticized at 260°C, processed through a filter, and extruded into a T-shaped die with a die temperature of 250°C to form thin sheets. The filter adopts a pleated filter core, and the filter is heated by oil vapor.

[0033] The above sheet is cooled and shaped by chilling roll and high-pressure air knife, wherein the air knife pressure is 110mbar; the chilling roll adopts a spiral groove flow channel, and the temperature of the air knife and chilling roll is 100°C. The thickness of the cast sheet obtained by shaping is 48 times the thickness of the designed product. Thick sheets are sequentially stretched through four sets of preheating rollers, and stretched synchronously under the condition that the stretching ratio is 6 times in the longitudinal direction and 8 times in the transv...

Embodiment 2

[0035] Adopt the same embodiment as Example 1, but the cast sheet thickness is 45 times of the design product thickness, and the draw ratio is 5 times in the longitudinal direction and 9 times in the transverse direction. The temperature of the preheating zone along the feeding direction gradually increases to 123°C, 133°C and 145°C; the temperature of the stretching zone is 150°C, 155°C, 160°C, 165°C; the temperature of the heat setting zone is 160°C, 155°C °C, 145 °C. The thickness of the finally obtained polypropylene capacitor film is 2.5 μm.

Embodiment 3

[0037] Adopt the same embodiment as Example 1, but the extrusion temperature is 250°C, the cast sheet thickness is 40 times the design product thickness, and the stretch ratio is 5 times in the longitudinal direction and 8 times in the transverse direction. The temperature of the preheating zone along the feeding direction gradually increases to 120°C, 130°C and 145°C; the temperature of the stretching zone is 148°C, 152°C, 158°C, 162°C; the heat setting zone is 160°C, 155°C, 145°C. The thickness of the finally obtained polypropylene capacitor film is 4.0 μm.

[0038] The main test method is GB / T12802, and the results are shown in Table 1.

[0039] Table 1

[0040]

[0041] From the examples and test results, the present invention selects high-purity electrical-grade polypropylene raw material and adopts the 2-4 μm ultra-thin biaxially stretched film polypropylene film prepared by a bidirectional simultaneous stretching process, and its heat resistance, dielectric strengt...

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Abstract

The invention relates to a high-performance ultrathin polypropylene capacitor film and a preparation method thereof. The preparation method comprises the following steps: with high-purity electrician-grade polypropylene as raw material, sequentially carrying out melt extrusion and casting, then carrying out bidirectional synchronous drawing in a drawing ratio of 40-50 times, then cooling for sizing, carrying out trimming and corona treatment, thus obtaining the polypropylene capacitor film finished product with the thickness of 2-4 micrometers. The polypropylene capacitor film prepared by adopting the preparation method has the thermal shrinkage in a machine direction (MD) of 1.5-2.5% and the thermal shrinkage in a transverse direction (TD) of 0.15-0.5% and is especially applicable to a dielectric insulating film in a high-capacity, small-volume, high-power, direct-current and high-voltage capacitor.

Description

technical field [0001] The invention relates to a high-performance ultra-thin polypropylene capacitor film and a manufacturing method thereof, and is especially suitable for ultra-thin high-temperature-resistant polypropylene film used as a dielectric in high-capacity, small-volume, high-power, electric power and other high-voltage capacitors. Background technique [0002] Polypropylene film has stable physical properties, excellent mechanical strength and excellent electrical insulation performance, especially the polypropylene film produced by biaxial stretching, which has light weight, low loss, high voltage breakdown field strength, and electrical insulation Excellent mechanical properties and other characteristics make it especially suitable for film capacitors in the field of strong electricity under power frequency, such as power capacitors, electrical equipment capacitors, electric locomotive capacitors, hybrid electric vehicle capacitors, etc. [0003] With the deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
Inventor 曹君李晓敏黄渝鸿陈凤韩青霞阳龑李涛杨帆袁彬彬
Owner 永威(天津)科技有限公司
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