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Process for preparing PVDF insulation dielectric layer material for sulfuric dielectric capacitor

An insulating dielectric layer and capacitor technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low acid absorption rate and poor hydrophilicity of filament non-woven fabrics, and achieve high acid absorption rate, small dimensional deformation, heat small shrink effect

Inactive Publication Date: 2012-02-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since PVDF is a hydrophobic material with a water contact angle > 90°, the hydrophilicity of the obtained filament nonwovens is poor and the acid absorption rate is low. Therefore, it is necessary to select a suitable monomer and method for spinning Hydrophilic modification of sticky filament nonwovens

Method used

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  • Process for preparing PVDF insulation dielectric layer material for sulfuric dielectric capacitor
  • Process for preparing PVDF insulation dielectric layer material for sulfuric dielectric capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the PVDF raw material is first sent from the hopper 1 to the screw extruder 2 for melt extrusion. The temperature of the screw extruder 2 is 260°C. After the material is fully melted, it is sent to the filtration system 3, where the material is After the impurities (such as carbon, ash, etc.) are filtered out, the material enters the metering pump 5 through the melt pipe 4, and the temperature of the metering pump 5 and the distribution pipe 6 is kept at about 260°C. Spinning is carried out in the spinning chamber 8, and the filaments spun by the spinning assembly 7 are air-cooled by the cooling windshield 9 to form crystallized primary growth filaments. The as-grown filaments are sent into the air drafter 10 for drafting at a drafting speed of 3500 m / min, and fibers with a fiber size and fineness of 15 μm are obtained after drafting. The filaments coming out of the air drafter 10 are sent to the web forming machine 11 for laying. A suction s...

Embodiment 2

[0028] Such as figure 1As shown, the PVDF raw material is first sent from the hopper 1 to the screw extruder 2 for melt extrusion. The temperature of the screw extruder 2 is 280°C. After the material is fully melted, it is sent to the filtration system 3, where the material is After the impurities (such as carbon, ash, etc.) are filtered out, the material enters the metering pump 5 through the melt pipe 4, and the temperature of the metering pump 5 and the distribution pipe 6 is kept at about 280°C. Spinning is carried out in the spinning chamber 8, and the filaments spun by the spinning assembly 7 are air-cooled by the cooling windshield 9 to form crystallized primary growth filaments. The as-grown filaments are sent into the air drafter 10 for drafting at a drafting speed of 4000 m / min. After drafting, fibers with a fiber size and fineness of 11 μm are obtained. The filaments coming out of the air drafter 10 are sent to the web forming machine 11 for laying. A suction syste...

Embodiment 3

[0030] Such as figure 1 As shown, the PVDF raw material is first sent from the hopper 1 to the screw extruder 2 for melt extrusion. The temperature of the screw extruder 2 is 220°C. After the material is fully melted, it is sent to the filtration system 3, where the material is After the impurities (such as carbon, ash, etc.) are filtered out, the material enters the metering pump 5 through the melt pipe 4, and the temperature of the metering pump 5 and the distribution pipe 6 is kept at about 220°C. Spinning is carried out in the spinning chamber 8, and the filaments spun by the spinning assembly 7 are air-cooled by the cooling windshield 9 to form crystallized primary growth filaments. The as-grown filaments are sent into the air drafter 10 for drafting at a drafting speed of 3500 m / min, and fibers with a fiber size and fineness of 18 μm are obtained after drafting. The filaments coming out of the air drafter 10 are sent to the web forming machine 11 for laying. A suction s...

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Abstract

The invention discloses a process for preparing a PVDF insulation dielectric layer material for a sulfuric dielectric capacitor, which utilizes a low-temperature plasma graft polymerization technique to enable hydrophilic monomer MAH to be in graft polymerization on the surface of PVDF spunbond filament nonwoven fabric, can improve hydrophily thereof, can increase acid absorption rate and acid maintaining rate, and can meet requirements of insulation dielectric layers of high-temperature high-acid electrolyte capacitors. The process for preparing a PVDF insulation dielectric layer material for a sulfuric dielectric capacitor firstly utilizes a spunbond process to spin the PVDF filament nonwoven fabric, and then improves the hydrophily of the spun PVDF filament nonwoven fabric.

Description

technical field [0001] The invention relates to a preparation method of an insulating dielectric layer material, in particular to a preparation method of a PVDF insulating dielectric layer material for sulfuric acid dielectric capacitors. Background technique [0002] As an important part of the electrolytic capacitor or battery system, the insulating dielectric layer is mainly used to separate the positive and negative active materials of the capacitor or battery system to avoid short-circuiting of the positive and negative electrodes. During the working process of the battery, the insulating dielectric layer itself does not directly participate in the electrochemical energy storage process. In the process of charging and discharging, the insulating dielectric layer acts as a channel for the smooth migration of ions in the electrolyte. [0003] When the main electrolyte component of the electrolytic capacitor is sulfuric acid and it is used at high temperature, the existin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M14/28D04H3/16H01G9/02
Inventor 魏无际黄健梁海霞祝佳丽方显力
Owner NANJING TECH UNIV