| 摘要 |
PROBLEM TO BE SOLVED: To prevent an electrolytic solution from leaking out from an electrolytic capacitor by a method wherein quaternary ammonium salt is dissolved in a solvent containing an ethylene glycol orγ-butyrolactone as its main component as the main solute of the solvent and a specified amount of 4- hydroxyazobenzene is added to the electrolytic solution. SOLUTION: A solute containing o-tetraethyl phthalate ammonium as its main component is mixed in a solvent containingγ-butyrolactone as its main component and an electrolytic solution is prepared. 0.1 to 3.0wt.% of 4-0 hydroxyazobenzene is added to this electrolytic solution. A capacitor element 5 is impregnated with these electrolytic solutions, the element 5 is housed in an enclosure case 6 made of aluminum, the case 6 is sealed with a butyl rubber sealing material 3, aging is made and an electrolytic capacitor is manufactured. Thereby, as what is adsorbed in the vicinity of the round rod part of a cathode tab terminal 2 out of the 4-hydroxyazobenzene added to the electrolytic solution is bonded with aluminum and chelate insoluble to the solvent is formed, the electrolytic solution can be prevented from leaking out from the electrolytic capacitor.
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