JP2000058393A - Electrolytic solution for driving aluminium electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the specific resistance of electrolytic solution and to sufficiently correspond to the request of a market by using at least one type of either ethylene glycol or γ-butyrolactone as solvent with 2-methyl-1-pyrroline or the salt of it as solute. SOLUTION: 2-methyl-1-pyrroline or its salt represented by the formula is used as solute in electrolytic solution for driving aluminum electrolytic capacitor. Solvent where at least one type from ethylene glycol or γ-butyrolactone is made to be a main component is used as solvent dissolving the solute. At this time, the added amount of 2-methyl-1-pyrroline or the salt of it is set to be from about 15 to about 40 weight %. 2-methyl-1-pyrroline has features in that the degree of dissociation is high, the molecular weight is low, and the boiling point is high. Thus, the specific resistance of driving electrolysis solution is made to drop, the heat resistance is improved and to be sufficient capable of responding sufficient to the market request is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolyte for driving an aluminum electrolytic capacitor (hereinafter referred to as an electrolyte), and more particularly to an electrolyte having improved specific resistance.

[0002]

2. Description of the Related Art Conventionally, as a driving electrolyte for an aluminum electrolytic capacitor for low pressure, a solvent containing γ-butyrolactone as a main component and a salt of a carboxylic acid such as phthalic acid or maleic acid with triethylamine as a main solute are used. An electrolytic solution that has been dissolved was used.

[0003]

The electrolytes using these as solutes have a high specific resistance and have a problem that they cannot sufficiently meet the demands of the market.

[0004]

The present invention focuses on 2-methyl-1-pyrroline having a high degree of dissociation and a small molecular weight, and solves the above-mentioned problems by applying its characteristics to an electrolytic solution. It is. That is, 2-methyl-1
-An electrolytic solution for driving an aluminum electrolytic capacitor, wherein pyrroline (Formula 2) or a salt thereof is used as a solute.

[0005]

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[0006] The solvent for dissolving the solute is γ-
An electrolytic solution for driving an aluminum electrolytic capacitor as described above, wherein butyrolactone or ethylene glycol is used as a main solvent.

[0007] Further, there is provided an electrolytic solution for driving an aluminum electrolytic capacitor as described above, wherein 2-methyl-1-pyrroline or a salt thereof is used as a solute at 15 to 40% by weight.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION 2-Methyl-1-pyrroline has a structure as shown in Chemical formula 2, and has a higher degree of dissociation, a lower molecular weight and a higher boiling point than triethylamine (as shown in Chemical formula 3). The specific resistance can be made lower than that of an electrolytic solution using triethylamine, and the heat resistance can be improved.

[0009]

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[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete contents of the embodiments will be described below. Γ-butyrolactone as the main solvent, ethylene glycol as the auxiliary solvent, triethylamine hydrogen phthalate as the main solute in the conventional example, and hydrogen phthalate 2 as an example of the present invention.
-Methyl-1-pyrroline salt was used. Table 1 shows the electrolyte compositions and the specific resistances of the examples, comparative examples, and conventional examples. The example exhibits 129 Ω · cm (conventional example 168 Ω · cm) at the same solute concentration as the comparative example, and a low specific resistance of 23% can be realized. When the concentration of 2-methyl-1-pyrroline hydrogen phthalate is 10 wt% or less,
%, There is no effect on the reduction of the specific resistance, and 15 to 4
A range of 0 wt% is preferred.

[0011]

[Table 1]

[0012]

As described above, it is clear that the electrolytic solution for driving an aluminum electrolytic capacitor using 2-methyl-1-pyrroline or a salt thereof as a solute can reduce the specific resistance and sufficiently meet the demands of the market. is there.

Claims (3)

[Claims] 1. An electrolytic solution for driving an aluminum electrolytic capacitor, wherein 2-methyl-1-pyrroline (formula 1) or a salt thereof is used as a solute. Embedded image 2. The electrolytic solution for driving an aluminum electrolytic capacitor according to claim 1, wherein the solvent for dissolving the solute is γ-butyrolactone or ethylene glycol as a main solvent. 3. The electrolytic solution for driving an aluminum electrolytic capacitor according to claim 1, wherein 2-methyl-1-pyrroline or a salt thereof is used as a solute in an amount of 15 to 40% by weight.