JPS62263625A - Electrolyte for driving electrolytic capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrolytic solution for driving an electrolytic capacitor,
By significantly lowering the specific resistance of the electrolyte, the loss angle tangent and high frequency characteristics of electrolytic capacitors are improved.
Furthermore, the present invention provides an electrolytic capacitor that can be used at high temperatures, has a long life, and is highly reliable, capable of suppressing changes in capacitance and increases in leakage current.

[Prior Art and Cutting Point] Conventionally, so-called ethylene glycol/boric acid ester-based electrolytes have been used as electrolytes for driving aluminum electrolytic capacitors, especially for medium and high voltages. This type of electrolyte is
Heating progresses the esterification reaction between ethylene glycol and boric acid, and water is produced at this time.This water reacts with the aluminum foil, which is the material of the capacitor element Y in the electrolytic capacitor, and dissolves it. Electrolytic capacitors using this 'electrolyte' operate at higher temperatures in order to generate gas and raise the internal pressure of the 'C' capacitor. 1 of f! Cannot be used against targets! 6. In addition, in order to solve the above-mentioned problem, an electrolytic solution in the same system that accelerates Nisderization and is removed from the formation has also been proposed, and although the reaction with water is suppressed, the electrolytic solution The viscosity increases, and the specific resistance becomes extremely high.
The tangent and impedance at high frequencies increased significantly, making it impossible to meet the demands for high characteristics. For these reasons, ethyl non-glycol/Nisder borate electrolytes are not used in high-temperature electrolytic capacitors.
Organic acid-based electrolytes containing organic acids or their salts with relatively large molecular weights as solutes have been used and studied.

As a solute in organic acid-based electrolytes for medium and high pressures,
No. 13293 f, an electrolytic solution j for driving a Q solution capacitor is known, but such an electrolytic solution containing a tribasic acid (l 6-decanedicarboxylic acid) is an ethylene glycol-boric acid based electrolytic solution from the Congregation Song Dynasty. It is possible to obtain a capacitor with lower resistance and superior electrical characteristics compared to the conventional capacitor. However, the spark voltage was around 4°Ov, making it difficult to apply it to products with a rated voltage of 400V.

[Improvements and Summary of the Invention] However, the present invention can eliminate the above-mentioned drawbacks. Specifically, the present invention can eliminate the above-mentioned drawbacks. The present invention provides an electrolytic solution for driving an electrolytic capacitor that can be used at a rated voltage of 400 V by using one or more of basic acids or salts thereof.

[Example] First, specific examples of tribasic acids having a total number of carbon atoms of 12 to 34 and having a vinyl group or a carboxyl group in the side chain will be shown.

In the present invention, the solvent used is one or more of alcohols (such as ethylene glycol).

Next, 1,6-decanedicarboxylic acid or its salt, ↓
5 and Compounds 1 to 5, a mixture of tribasic acids or salts thereof, dissolved in a solvent. It is shown in the 1fi1 table.

The electrolyte composition is wt%, and the ratio of resistance (Ω・cm) is 2 when the liquid temperature is 2.
The spark voltage is 6°C at 0"C. Also, the spark voltage is 85°C.

Among the electrolytes shown in No. 1k, electrolytic converters using the electrolytes of Comparative Examples 1 and 2 and Example 3 (rating 4 Q
OV -10μF) 0) Each 20% M
Table 2 shows the results of a high-temperature load test at a temperature of 105° C. and a rated voltage applied for 100 t) hours.

Table 2 (400V/10.4zF) [Effects of the Invention] As can be seen from Table 2, in Conventional Example 1, the tangent of the K1 loss angle is about three times that of Example 1. Furthermore, in Conventional Example 2, it could not be commercialized due to insufficient spark voltage of the electrolyte.

As is clear from this example, the electrolytic solution of the present invention has a
The specific resistance will rise slightly, but the spark voltage will be 20~20.
The capacitor increases by 40V and can be used with electrolytic capacitors with a rated voltage of 400V, which was previously not possible.

[Scope of practical application of the invention] In addition, in the components of the electrolytic solution according to the present invention, the total number of carbon atoms is 12 to 12.
The mixing amount of the tribasic acid having a vinyl group or carboxyl group in the side chain of 34 or its salt is preferably in the range of 1 to 10 wt%. The spark voltage of the electrolyte decreases as the mixture M of tribasic acid or its salt having a vinyl group or carboxyl group in the side chain with a total carbon number of 12 to 34 increases, but at 10 wt% or more F Spark voltage does not improve. For example, 5wt of 1,6-decanedicarboxylic acid ammonium salt
Figure 1 shows the changes in concentration and spark voltage when Compound 1 (n = 5) was added to an electrolytic solution containing %.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the relationship between the concentration of Compound 1 (n=5) added to 1.6-decanedicarboxylic acid ammonium salt and the spark voltage of the electrolytic solution.

Claims (2)

[Claims] (1) 1,6-decanedicarboxylic acid or a salt thereof, and one or more dibasic acids having a total number of carbon atoms of 12 to 34 and having a vinyl group or a carboxyl group in the side chain, or a salt thereof. An electrolytic solution for driving an electrolytic capacitor characterized by comprising a solute and an organic polar solvent. (2) The electrolytic solution for driving an electrolytic capacitor according to claim (1), wherein the organic polar solvent is composed of one or more types of polyhydric alcohols.