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Capacitor separator and capacitor

A technology for capacitors and diaphragms, which is applied in the field of diaphragms for capacitors and capacitors. It can solve problems such as deterioration of impedance characteristics and increase in paper density, and achieve miniaturization, strength characteristics, and excellent short-circuit resistance.

Inactive Publication Date: 2016-08-31
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using highly tapped 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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  • Capacitor separator and capacitor
  • Capacitor separator and capacitor
  • Capacitor separator and capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121]The pulp was dissolved using TCF with a degree of polymerization of 700 to prepare a cellulose / NMMO solution having a composition of cellulose / NMMO=5 / 95 (% by weight, the same applies hereinafter). To the obtained cellulose / NMMO solution, PET fibers with a diameter of 3 μm and a fiber length of 1.0 mm were added in such an amount that cellulose / PET fibers=70 / 30, and a T-die extruder was used to form a slit of 0.15 mm. Extruded to the water (H 2 O) In a coagulation bath composed of regenerated cellulose. The regenerated cellulose was washed with a three-tank ion-exchanged water washing bath, then solvent-replaced with a three-tank isopropanol (hereinafter referred to as "IPA") bath, and dried with a tumble dryer to produce Thickness 29.8μm, density 0.31g / cm 3 , A porous membrane with an average pore diameter of 0.24 μm.

Embodiment 2

[0123] TCF linter pulp with a degree of polymerization of 1500 was used to prepare a cellulose / NMMO solution composed of cellulose / NMMO=10 / 90. To the obtained cellulose / NMMO solution, PET fibers with a diameter of 3 μm and a fiber length of 1.5 mm were added in such an amount that cellulose / PET fibers=50 / 50, and a T-die extruder was used to form a slit of 0.04 mm. After extruding and passing through an air gap of 10 mm, the cellulose was regenerated by dipping in a poor solvent coagulation bath of 20% by weight of NMMO. The regenerated cellulose was washed with a three-tank ion-exchange water washing bath, and then freeze-dried to obtain a thickness of 29.6 μm and a density of 0.11 g / cm 3 , A porous membrane with an average pore diameter of 4.97 μm.

Embodiment 3

[0125] TCF linter pulp with a degree of polymerization of 1500 was used to prepare a cellulose / NMMO solution composed of cellulose / NMMO=10 / 90. To the obtained cellulose / NMMO solution, a PET fiber with a diameter of 0.7 μm and a fiber length of 0.5 mm was added in such an amount that cellulose / PET fiber=99.5 / 0.5, and a T-die extruder was used to form a 0.04 mm Slit extrusion, passing through an air gap of 10mm, dipping in 20 wt% NMMO poor solvent coagulation bath to regenerate cellulose. The regenerated cellulose was washed with a three-tank ion-exchange water washing bath, and then freeze-dried to obtain a thickness of 28.8 μm and a density of 0.12 g / cm 3 , A porous membrane with an average pore diameter of 4.55 μm.

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PUM

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Abstract

A capacitor separator having excellent impedance characteristics and short-circuiting resistance, and allowing the capacitor to be reduced in size and / or increased in capacitance; and a capacitor in which the separator is used are provided. The separator for the capacitor includes a porous film made of cellulose dissolved and regenerated without forming a cellulose derivative (A) and a fibrous component (B), for example, the fibrous component (B) can be one or more kinds of fibers selected from a plant-based pulp, regenerated cellulose fiber, cellulose fiber, animal fiber, inorganic fiber, and synthetic fiber that are available as paper raw material. The regenerated cellulose (A) can be obtained by forming in a film form a cellulose solution made by dissolving cellulose in an amine oxide solvent, immersing the resulting cellulose solution in water or a poor solvent of the amine oxide solvent so as to coagulate and regenerate the cellulose, washing the regenerated cellulose with water to remove the amine oxide solvent, and drying the resulting cellulose, and therefore the porous film is a porous film the chlorine content of which is 2 ppm or below, the sulfate content of which is 10 ppm or below, the thickness of which is 3-70 mum, the density of which is 0.1 g / cm<3> or above, and the average pore diameter of which is 5 mum or below. The capacitor is characterized by adopting the separator.

Description

technical field [0001] The present invention relates to a separator for capacitors and a capacitor. 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) [0007] S: Area of ​​the electrode (m 2 ) [0008] d: Distance between electrodes (m) [0009] In an aluminum electrolytic capacitor, the diaphragm in the capacitor element is impregnated with an electrolyte solution, and the electrolyte solution impregnated with the diaphragm forms a true cathode, while the surface of the anode aluminum foil is formed by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/52H01G9/02H01G11/84
CPCH01G9/02H01G11/52H01G9/045Y02E60/13
Inventor 田中宏典藤本直树
Owner NIPPON KODOSHI
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