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Separator for aluminium electrolytic capacitor, and aluminium electrolytic capacitor

A technology of aluminum electrolytic capacitors and diaphragms, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of increased paper density and deterioration of impedance characteristics, and achieve the effect of excellent short-circuit resistance and miniaturization of capacitors.

Inactive Publication Date: 2015-09-16
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using highly disintegrated pulp, thin paper of about 10 μm can be produced, but the density of the paper increases, and the impedance characteristics are extremely deteriorated

Method used

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  • Separator for aluminium electrolytic capacitor, and aluminium electrolytic capacitor
  • Separator for aluminium electrolytic capacitor, and aluminium electrolytic capacitor
  • Separator for aluminium electrolytic capacitor, and aluminium electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] TCF linter pulp with a degree of polymerization of 1500 was used to prepare a cellulose / NMMO solution composed of cellulose / NMMO=10 / 90. The obtained cellulose / NMMO solution was extruded using a T-die extruder with a slit of 0.05mm. After passing through an air gap of 10mm, it was dipped in a poor solvent coagulation bath of 20% by weight of NMMO to regenerate cellulose. . The regenerated cellulose was washed with a three-tank ion-exchange water washing bath, and then freeze-dried to a thickness of 28.1 μm and a density of 0.11 g / cm 3 , average pore diameter 4.53μm, weight per square meter 3.1g / m 2 , A cellulose porous membrane with a chlorine content of 0.2 ppm and a sulfate content of 1.7 ppm.

Embodiment 2

[0109] TCF with a degree of polymerization of 800 was used to dissolve the pulp to obtain a cellulose / NMMO solution composed of cellulose / NMMO=5 / 95. In the obtained cellulose / NMMO solution, add polymethyl methacrylate particles with a diameter of 5 μm to an amount of 200% by weight relative to the cellulose, and after uniformly dispersing, use a T-die type extrusion molding machine, and use a 0.2 mm The slit width is extruded, and after passing through an air gap of 10 mm, it is dipped in a poor solvent coagulation bath of 20% by weight of NMMO to regenerate cellulose. The regenerated cellulose was washed with a 3-tank ion-exchanged water washing bath, then dissolved and removed with a 3-tank acetone bath to remove polymethyl methacrylate particles, and after solvent replacement was performed with a 3-tank isopropanol bath, the Dried in a type dryer to obtain a thickness of 51.2 μm and a density of 0.19 g / cm 3 , average pore diameter 2.96μm, weight per square meter 9.7g / m 2 ...

Embodiment 3

[0111] TCF with a degree of polymerization of 800 was used to dissolve the pulp to obtain a cellulose / NMMO solution composed of cellulose / NMMO=3 / 97. Silicon particles with a diameter of 1 μm were added to the obtained cellulose / NMMO solution to 100% by weight relative to the cellulose, and glycerol as a plasticizer was added to 1% by weight relative to the cellulose. After uniform dispersion, the T-die method was used to The extruder is extruded with a slit width of 0.1 mm, and after passing through an air gap of 10 mm, it is dipped in a poor solvent coagulation bath of 20% by weight of NMMO to regenerate cellulose. The regenerated cellulose was washed with 3 tanks of ion-exchanged water baths, dissolved and removed with 3 tanks of 30% by weight potassium hydroxide aqueous solution to remove silicon particles, washed with 3 tanks of ion-exchanged water baths, and dried by drum Machine to dry, made thickness 5.5μm, density 0.72g / cm 3 , average pore size 0.15μm, weight per squa...

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Abstract

[Problem] To provide a separator for an aluminium electrolytic capacitor and an aluminium electrolytic capacitor, the separator exhibiting excellent impedance characteristics and short-circuiting resistance, and comprising a cellulose porous membrane manufactured using an amine oxide cellulose solution. [Solution] A separator for an aluminium electrolytic capacitor and an aluminium electrolytic capacitor that is characterised by using the separator, the separator being formed from a cellulose porous membrane that comprises regenerated cellulose that has been dissolved and regenerated without forming a cellulose derivative, the cellulose porous membrane comprising regenerated cellulose that is obtained by forming a cellulose solution, which is cellulose dissolved in an amine oxide solvent or the like, into a membrane, solidifying and regenerating cellulose by immersing the membrane in water or a poor solvent of an amine oxide solvent, and, after having removed the amine oxide solvent from the regenerated cellulose, drying the result.

Description

technical field [0001] The present invention relates to a diaphragm for an aluminum electrolytic capacitor and an aluminum electrolytic capacitor, for example, an aluminum electrolytic capacitor capable of reducing the size and / or increasing the capacity and / or reducing the impedance of the capacitor by using a cellulose porous film made of regenerated cellulose as the diaphragm A diaphragm and an aluminum electrolytic capacitor using the diaphragm. Background technique [0002] A general aluminum electrolytic capacitor is made by inserting a separator between the anode aluminum foil and the cathode aluminum foil and then winding it to make a capacitor element. The capacitor element is impregnated with electrolyte, put into the container, sealed, and then aged. . [0003] The electrostatic capacity of the capacitor is represented by the following formula (1). [0004] C=ε·S / d···Formula (1) [0005] C: Capacitance (F) [0006] ε: Permittivity of the dielectric (F / m) [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02
CPCH01G9/02H01G9/035H01G9/045
Inventor 田中宏典藤本直树
Owner NIPPON KODOSHI
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