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Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor

A technology of biaxial stretching and manufacturing method, used in applications, household appliances, flat products, etc., can solve the problems of poor product quality and performance, difficult to meet the breakdown voltage of power capacitors, and electrical weaknesses.

Active Publication Date: 2010-10-20
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the ultra-thin biaxially oriented polypropylene roughened film products with a thickness of 6 μm to 8 μm produced by the existing technology have poor product quality and performance, and it is difficult to meet the requirements of breakdown voltage and electrical weakness of power capacitors under high field strength.

Method used

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  • Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor
  • Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor
  • Manufacturing method of super thin bidirectional stretched polypropylene coarse thin film for capacitor

Examples

Experimental program
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Embodiment 1

[0025] A method for manufacturing an ultra-thin biaxially oriented polypropylene roughened film for capacitors, comprising the following steps:

[0026] (1) The method of mixing and co-extruding with three-layer composite die head, main extruder and auxiliary extruder; using two kinds of special thickeners for electrical grade with an isotacticity of 95% to 98%, an ash content of less than 30ppm, and a different melt index. Polypropylene resin material; core layer material melt index is 2.5g / 10min~3.2g / 10min, extrusion ratio is 65%~75%, extruded by main extruder, extrusion temperature is 230℃~250℃; The melt index of the surface layer material is 3.5g / 10min~4.2g / 10min, the extrusion ratio is 25%~35%, extruded by the auxiliary extruder, and the extrusion temperature is 210℃~230℃;

[0027] (2) When the melt is cooled, the temperature of the cooling roll is controlled at 95°C to 105°C. At the same time, when the melt is attached to the cooling roll, the back side is cooled by a he...

Embodiment 2

[0030] A method for manufacturing an ultra-thin biaxially oriented polypropylene roughened film for capacitors, comprising the following steps:

[0031] a. Ingredients: The ingredients are formulated according to the weight percentage of 65% of the core layer material and 35% of the surface layer material. The core layer material adopts an isotacticity of 95% to 98%, an ash content of less than 30ppm, and a melt index of 2.5g / 10min to 3.2 g / 10min polypropylene resin material (manufacturers include Borealis HC312BF, Japan Mitsui Chemicals F104A-1, etc., and other embodiments can be the same), and the surface layer material adopts an isotacticity of 95% to 98%, an ash content of less than 30ppm, A polypropylene resin material with a melt index of 3.5g / 10min to 4.2g / 10min (manufacturers include Borealis HC314BF, Mitsui Chemicals F104A, etc., and other embodiments can be the same);

[0032] b. Melt extrusion: the core layer material and the surface layer material are melted by the...

Embodiment 3

[0037] A method for manufacturing an ultra-thin biaxially oriented polypropylene roughened film for capacitors, comprising the following steps:

[0038] a. Ingredients: The ingredients are formulated according to the weight percentage of 75% of the core layer material and 25% of the surface layer material. The core layer material adopts an isotacticity of 95% to 98%, an ash content of less than 30ppm, and a melt index of 2.5g / 10min to 3.2 g / 10min polypropylene resin material, the surface layer material adopts a polypropylene resin material with an isotacticity of 95% to 98%, an ash content of less than 30ppm, and a melt index of 3.5g / 10min to 4.2g / 10min; the core layer The materials and surface materials are all electrical grade special polypropylene resin materials;

[0039] b. Melt extrusion: the core layer material and the surface layer material are melted by the main and auxiliary double extruders at the same time, and then extruded through the auxiliary-main-auxiliary thr...

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Abstract

The invention discloses a manufacturing method of a super thin bidirectional stretched polypropylene coarse thin film for a capacitor. The manufacturing method is characterized by comprising the following steps of: adopting two polypropylene resin materials with degree of isotacticity of 95-98%, ash content being smaller than 30ppm and different melt indexes, melting by a primary extruder and an auxiliary extruder, extruding by a three-layered compound die head, cooling and forming at 95-105 DEG C via a cooling roller and a casting piece air knife; then stretching longitudinally with 4.5-5.0 fold of draw ratio, and forming the coarse thin film product with three-dimensional netty groove structures which are communicated with each other after stretching horizontally with 8-9 fold of draw ratio. The polypropylene coarse thin film prepared by using the invention can not only ensure good oil immersion property of the capacitor, but also satisfy the voltage resisting requirements of the capacitor under high field intensity, and is particularly suitable for being used as an electrical medium in power capacitors with large capacity, small volume and high power and the like.

Description

technical field [0001] The invention belongs to the preparation method of polymer compound obtained by only using carbon-carbon unsaturated bond reaction, and relates to a method for manufacturing ultra-thin biaxially stretched polypropylene roughened film for capacitors; it is especially suitable for the thickness of 6 μm-8 μm Manufacture of ultra-thin biaxially stretched polypropylene roughened film for capacitors; the prepared polypropylene roughened film is suitable for the manufacture of large-capacity, small-volume, high-power power capacitor products. Background technique [0002] As a non-polar dielectric material, biaxially oriented polypropylene film has the characteristics of light weight, low loss, good stability, excellent electrical insulation and mechanical properties, and is an ideal dielectric material for high-voltage power capacitors and low-voltage electronic capacitors. It is widely used in Capacitors in various industries. With the development of socie...

Claims

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Application Information

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IPC IPC(8): B29C55/14B29C47/06B29C47/92B29C47/88B29K23/00B29L7/00B29C48/08B29C48/92
CPCB29C48/08B29C48/914B29C48/917
Inventor 申时林苏里勇柯希斌李高聪谢晋
Owner SICHUAN DONGFANG INSULATING MATERIAL
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