JPH08273985A - Electrolyte for driving electrolytic capacitor - Google Patents

Abstract

PURPOSE: To provide electrolytic capacitor driving electrolyte which does not color human organism nor machine even when it adheres to human organism or machine and prevents the spark generating voltage from reducing by using organic peroxide as gas absorbent for driving electrolyte. CONSTITUTION: Organic peroxide is added to electrolyte which is provided by adding organic carboxylic acid or boric acid or salt of these to a solvent. The organic peroxide is the mixture of one or two materials of the following: 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane, 1,3-bis-(t- butylperoxyisopropyl)benzene, t-butylperoxyisopropyl carbonate. At least 0.5wt.% organic peroxide is to be added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution for driving an electrolytic capacitor, and more particularly to an electrolytic solution for driving an electrolytic capacitor containing a novel absorbent for absorbing gas generated from a capacitor element.

[0002]

2. Description of the Related Art Conventionally, as an electrolytic solution for driving an electrolytic capacitor, ethylene glycol, diethylene glycol,
γ-butyrolactone, monomethylformamide, dimethylformamide and the like as a solvent, in which an inorganic acid or its ammonium salt (boric acid, ammonium borate, etc.) is dissolved, or an organic acid (sebacic acid, azelaic acid, benzoic acid, 1,6 -Decanedicarboxylic acid, 1-methyl-
1,7-Heptanedicarboxylic acid, 1,3-dimethyl-
1,3,9-nonanetricarboxylic acid or the like) or a salt thereof is used as a solute, and in order to absorb hydrogen gas generated from the capacitor element, paranitrophenol, paranitrobenzoic acid, paranitroacetophenone or the like is used as a gas absorbent. Nitro compound was added.

Explaining the generation mechanism of this hydrogen gas, the water contained in the driving electrolyte is electrolyzed by the leakage current flowing through the capacitor element to generate hydrogen gas from the cathode foil.

[0004]

However, the above-mentioned nitro compounds have a strong property of developing a yellow color, are difficult to remove when they adhere to a human body or a machine, and have a problem of lowering the spark generation voltage of the electrolytic solution. Yes, there was a limit to the voltage used.

The present invention has been made to solve the above-mentioned drawbacks. By using an organic peroxide instead of a nitro compound as a gas absorbent of a driving electrolyte, the present invention can be applied to a human body or a machine. It is intended to provide an electrolytic solution for driving an electrolytic capacitor, which does not develop a color even when adhered and does not reduce the spark generation voltage.

[0006]

In the electrolytic solution for driving an electrolytic capacitor according to the present invention, the invention according to claim 1 provides a driving electrolytic solution in which an organic carboxylic acid or boric acid or a salt thereof is added as a solute to a solvent. The electrolytic solution for driving an electrolytic capacitor is characterized by adding an organic peroxide. The invention of claim 2 is a driving electrolyte solution in which the solvent in claim 1 is one kind or a mixture of two or more kinds of ethylene glycol, diethylene glycol, γ-butyrolactone, monomethylformamide and dimethylformamide. In the invention, the organic carboxylic acid is sebacic acid, azelaic acid, benzoic acid, 1,6-decanedicarboxylic acid, 1-methyl-1,7-heptanedicarboxylic acid,
A driving electrolytic solution comprising one or a mixture of two or more of 1,3-dimethyl-1,3,9-nonanetricarboxylic acid, wherein the organic peroxide is 1,1-dicarboxylic acid. -T
-Butylperoxy-3,3,5-trimethylcyclohexane, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane,
2,5-Dimethyl-2,5-di (t-butylperoxy) hexene, 1,3bis- (t-butylperoxy)-
iso-propyl) benzene, t-butylperoxy-
A driving electrolytic solution comprising one kind or a mixture of two or more kinds of iso-propyl carbonate. Claim 5 is a driving electrolytic solution containing at least 0.5% by weight of this organic peroxide.

[0007]

According to the electrolytic capacitor driving electrolytic solution configured as described above, the organic peroxide is similar to the nitro compound in that it contains hydrogen gas generated by the moisture of the driving electrolytic solution and the leakage current flowing through the capacitor element. In addition to having the function of absorbing, the driving electrolyte solution containing this peroxide has the characteristics that no decrease in the spark generation voltage is observed, and it is colorless and transparent and should be colored even if it adheres to the human body or machinery. Since there is no nitro compound, it is much easier to handle and work as compared with the case of adding a nitro compound.

[0008]

EXAMPLES Examples of the electrolytic solution for driving an electrolytic capacitor according to the present invention will be described below.

Example A Table 1 shows the composition of each driving electrolytic solution of the conventional example, the example, and the reference example, and Table 2 shows a rating of 50V-2200 μF produced using these driving electrolytic solutions. Case size φ18
High temperature load test (1000 h at 105 ° C with 50 V applied) for each 20 mm x L35 mm capacitors
The external appearance and the amount of hydrogen gas are shown below. The hydrogen gas amount (ml) shown in Table 2 is an average value of 20 samples, and the explosion-proof valve is made of an aluminum case with a flaw.

[0010]

[Table 1]

[0011]

[Table 2]

As is clear from Table 2, in Reference Example 1 in which the addition amount of the organic peroxide (t-butylperoxy-iso-propylcarbonate) was 0.3% by weight, the hydrogen gas amount was in the conventional example or the example. It was about 3 to 6 times as much as that of No. 1, and all explosion-proof valves swelled. In Example 8 in which the same organic peroxide was added by 0.5% by weight, there was no abnormality at all, so when the amount of the organic peroxide added was small, the gas absorption capacity might be insufficient. In case of, 0.5% by weight
Abnormal addition is required. Further, in Reference Example 2 in which no nitro compound or organic peroxide was added at all, the generated hydrogen gas could not be absorbed, so that all explosion-proof valves were operating.

From these results, it can be seen that the example has a gas absorption capacity equivalent to that of a nitro compound conventionally used as a gas absorbent.

Example B Next, the spark generation voltage was investigated for the driving electrolyte solutions shown in Conventional Examples 1 and 2 and Examples 1 and 2, and the results are shown in Table 3. The only difference between this conventional example and the example is that the added gas absorbent is a nitro compound in the conventional example and an organic peroxide in the example.

[0015]

[Table 3]

As shown in Table 3, in the examples in which the organic peroxide was added, the voltage was 40 to 50 V higher than that in the conventional example in which the nitro compound was added, and the decrease in the spark voltage due to the addition of the gas absorbent is prevented. be able to.

In the above examples, the case where ethylene glycol or γ-butyrolactone was used as the solvent was described. However, the same applies when diethylene glycol, monomeerformamide, dimethylformamide are used alone or in an abnormal mixture of two kinds. The effect of can be obtained.

As the organic carboxylic acid, in addition to those shown in the examples, azelaic acid and 1-methyl-1,7
-Heptanedicarboxylic acid, 1,3-dimethyl-1,3
You may use 9-nonane tricarboxylic acid etc. individually or in mixture of 2 or more types.

[0019]

As described above, according to the electrolytic capacitor driving electrolytic solution of the present invention, since the organic peroxide is used as the gas absorbent, the conventionally used nitro compound and the absorption capacity are In the same manner, it is possible to obtain the effect of reducing the spark generation voltage, which has been a drawback of nitro compounds, and preventing the adherence of color to the human body or machine.

Claims (5)

[Claims] 1. An electrolytic solution for driving an electrolytic capacitor, wherein an organic peroxide is added to a driving electrolyte solution in which an organic carboxylic acid or boric acid or a salt thereof is added as a solute to a solvent. 2. The electrolytic solution for driving an electrolytic capacitor according to claim 1, wherein the solvent comprises one kind or a mixture of two or more kinds among ethylene glycol, diethylene glycol, γ-butyrolactone, monomethylformamide and dimethylformamide. . 3. The organic carboxylic acid is adipic acid, sebacic acid, azelaic acid, benzoic acid, 1,6-decanedicarboxylic acid, 1-methyl-1,7-heptanedicarboxylic acid,
The compound according to claim 1 or claim 1, which comprises one or a mixture of 1,3-dimethyl-1,3,9-nonanetricarboxylic acid, maleic acid, citraconic acid, salicylic acid and phthalic acid. 2. An electrolytic solution for driving an electrolytic capacitor as described in 2. 4. The organic peroxide is 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane,
Di-t-butyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, 2,5-dimethyl-
2,5-di (t-butylperoxy) hexane, 2,5
-Dimethyl-2,5-di (t-butylperoxy) hexene, 1,3 bis- (t-butylperoxy-iso-
Propyl) benzene, t-butylperoxy-iso-
The electrolytic solution for driving an electrolytic capacitor according to any one of claims 1 to 3, which is composed of one kind or a mixture of two or more kinds of propyl carbonate. 5. The amount of organic peroxide added is at least 0.
It is 5% by weight, and the electrolytic solution for driving an electrolytic capacitor according to any one of claims 1 to 4.