JP4520002B2 - Electrolytic solution for driving aluminum electrolytic capacitors - Google Patents
Electrolytic solution for driving aluminum electrolytic capacitors Download PDFInfo
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- JP4520002B2 JP4520002B2 JP2000273055A JP2000273055A JP4520002B2 JP 4520002 B2 JP4520002 B2 JP 4520002B2 JP 2000273055 A JP2000273055 A JP 2000273055A JP 2000273055 A JP2000273055 A JP 2000273055A JP 4520002 B2 JP4520002 B2 JP 4520002B2
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- electrolytic solution
- maleic acid
- electrolytic
- driving
- ethylene glycol
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Description
【０００１】
【発明の属する技術分野】
本発明は、アルミニウム電解コンデンサ駆動用電解液（以下、電解液と称す）に関するものであり、特に電解液の比抵抗の経時変化の改善に関するものである。
【０００２】
【従来の技術】
従来、低圧用アルミニウム電解コンデンサの電解液としては、γ−ブチロラクトンを主成分とする溶媒に、フタル酸やマレイン酸などのカルボン酸類と、トリエチルアミンなどのアミン塩を主溶質として溶解した電解液を用いている。
【０００３】
【発明が解決しようとする課題】
フタル酸塩を主溶質とした電解液は比抵抗が高く、アルミニウム電解コンデンサの低損失化を望む市場の要求に充分に対応できないということから、マレイン酸塩を主溶質として溶解した電解液を用いることが望ましい。
しかしながらマレイン酸塩を主溶質とした電解液は、マレイン酸が脱炭酸反応や重合反応をおこすため、電解液の比抵抗の経時変化が大きいという問題があった。
【０００４】
【課題を解決するための手段】
本発明は、上記課題を解決するため、ラジカル吸収能力を有するポリ−２，２，４−トリメチル−１，２−ジヒドロキノリンを添加することで、マレイン酸の脱炭酸反応や重合反応を阻害し、電解液の比抵抗の経時変化を抑制しようとするものである。すなわち、エチレングリコール、γ−ブチロラクトンのうち少なくとも１種を溶媒とし、マレイン酸またはその塩を主溶質とし、ポリ−２，２，４−トリメチル−１，２−ジヒドロキノリンを０．０１〜５．００ｗｔ％添加したことを特徴とするアルミニウム電解コンデンサ駆動用電解液である。
【０００６】
また、γ−ブチロラクトンを主溶媒とし、副溶媒としてエチレングリコールを１〜２０ｗｔ％添加したことを特徴とする上記アルミニウム電解コンデンサ駆動用電解液である。
【０００７】
【発明の実施の形態】
ポリ−２，２，４−トリメチル−１，２−ジヒドロキノリン（ＴＭＤＱ）は強力なラジカル吸収剤であり、マレイン酸またはその塩を主溶質とした電解液の比抵抗の経時変化の原因であるマレイン酸の脱炭酸反応や重合反応を阻止する効果を有する。
【０００８】
【実施例】
以下、本発明の実施例について具体的に説明する。
表１の組成で電解液を調合し、各電解液を、完全に密封したアンプル管中に封入して１０５℃の恒温槽中に放置し、比抵抗の経時変化を測定した。
【０００９】
【表１】
表１よりＴＭＤＱを０．０１ｗｔ％以上添加した実施例は、１０５℃２０００時間後の電解液の比抵抗の経時変化が従来例より安定していることが分かる。ＴＭＤＱを１０ｗｔ％添加すると電解液に完全に溶解しないため、ＴＭＤＱの添加量は０．０１〜５．００ｗｔ％の範囲が適当である。
【００１１】
実施例では主溶質にマレイン酸水素トリエチルアミンを用いたが、本発明はこれに限定されるものではなく、メチルアミン、エチルアミン等のマレイン酸の１級アミン塩、ジメチルアミン、エチルメチルアミン、ジエチルアミン等のマレイン酸の２級アミン塩、トリメチルアミン、ジメチルエチルアミン、ジエチルメチルアミン、トリエチルアミン等のマレイン酸の３級アミン塩、テトラメチルアンモニウム、テトラエチルアンモニウム等のマレイン酸の４級アンモニウム塩、マレイン酸のイミダゾリニウム塩等種々のマレイン酸塩に適用することができる。
【００１２】
実施例５の電解液を基に、γ−ブチロラクトンとエチレングリコールとの混合量を各種組み合わせた電解液を調合し、−５５℃と＋２０℃の電解液比抵抗を測定した。エチレングリコール量と−５５℃／＋２０℃電解液比抵抗倍率を図１に示す。副溶媒のエチレングリコール量を増やすほど電解液の低比抵抗化が可能だが、図１より副溶媒としてのエチレングリコール量は、１〜２０ｗｔ％の範囲が好ましい。
【００１３】
【発明の効果】
上記のとおり、本発明によるマレイン酸またはその塩を主溶質とし、ポリ−２，２，４−トリメチル−１，２−ジヒドロキノリンを添加したアルミニウム電解コンデンサ駆動用電解液は、低比抵抗でかつ比抵抗の経時変化の抑制が可能であり、工業的価値大なるものである。
【図面の簡単な説明】
【図１】エチレングリコール量と−５５℃／＋２０℃電解液比抵抗倍率との特性図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrolytic solution for driving an aluminum electrolytic capacitor (hereinafter referred to as an electrolytic solution), and in particular, to an improvement in change over time in the specific resistance of the electrolytic solution.
[0002]
[Prior art]
Conventionally, as an electrolytic solution for an aluminum electrolytic capacitor for low pressure, an electrolytic solution obtained by dissolving a carboxylic acid such as phthalic acid or maleic acid and an amine salt such as triethylamine as a main solute in a solvent mainly composed of γ-butyrolactone. ing.
[0003]
[Problems to be solved by the invention]
Electrolyte with phthalate as the main solute has high specific resistance, and it cannot sufficiently meet the demands of the market that wants to reduce the loss of aluminum electrolytic capacitors. Therefore, use an electrolyte with maleate as the main solute. It is desirable.
However, the electrolytic solution containing maleate as a main solute has a problem that the specific resistance of the electrolytic solution changes with time because maleic acid undergoes a decarboxylation reaction or a polymerization reaction.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention inhibits maleic acid decarboxylation reaction and polymerization reaction by adding poly-2,2,4-trimethyl-1,2-dihydroquinoline having radical absorption ability. It is intended to suppress the change with time of the specific resistance of the electrolytic solution. That is, at least one of ethylene glycol and γ-butyrolactone is used as a solvent, maleic acid or a salt thereof as a main solute, and poly-2,2,4-trimethyl-1,2-dihydroquinoline is added in an amount of 0.01 to 5. It is an electrolytic solution for driving an aluminum electrolytic capacitor characterized by adding 00 wt% .
[0006]
The above-mentioned electrolytic solution for driving an aluminum electrolytic capacitor is characterized in that γ-butyrolactone is used as a main solvent and ethylene glycol is added as an auxiliary solvent in an amount of 1 to 20 wt%.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Poly-2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) is a powerful radical absorbent, and causes the time-dependent change in specific resistance of an electrolytic solution containing maleic acid or a salt thereof as a main solute. It has the effect of inhibiting maleic acid decarboxylation and polymerization reactions.
[0008]
【Example】
Examples of the present invention will be specifically described below.
An electrolyte solution was prepared with the composition shown in Table 1, and each electrolyte solution was sealed in a completely sealed ampoule tube and allowed to stand in a thermostatic bath at 105 ° C., and a change with time in specific resistance was measured.
[0009]
[Table 1]
From Table 1, it can be seen that in the example in which 0.01 wt% or more of TMDQ was added, the change over time in the specific resistance of the electrolytic solution after 2000 hours at 105 ° C. was more stable than the conventional example. When TMDQ is added in an amount of 10 wt%, it is not completely dissolved in the electrolytic solution.
[0011]
In the examples, triethylamine hydrogen maleate was used as the main solute, but the present invention is not limited to this, and primary amine salts of maleic acid such as methylamine and ethylamine, dimethylamine, ethylmethylamine, diethylamine and the like. Secondary amine salt of maleic acid, tertiary amine salt of maleic acid such as trimethylamine, dimethylethylamine, diethylmethylamine and triethylamine, quaternary ammonium salt of maleic acid such as tetramethylammonium and tetraethylammonium, imidazole of maleic acid It can be applied to various maleates such as nium salts.
[0012]
Based on the electrolyte solution of Example 5, an electrolyte solution in which various amounts of γ-butyrolactone and ethylene glycol were mixed was prepared, and the electrolyte resistivity at −55 ° C. and + 20 ° C. was measured. The ethylene glycol amount and the -55 ° C / + 20 ° C electrolyte resistivity ratio are shown in FIG. Although the specific resistance of the electrolytic solution can be reduced as the amount of the ethylene glycol as the auxiliary solvent is increased, the amount of ethylene glycol as the auxiliary solvent is preferably in the range of 1 to 20 wt% from FIG.
[0013]
【The invention's effect】
As described above, an electrolytic solution for driving an aluminum electrolytic capacitor containing maleic acid or a salt thereof according to the present invention as a main solute and added with poly-2,2,4-trimethyl-1,2-dihydroquinoline has a low specific resistance and It is possible to suppress the change in specific resistance with time, and the industrial value is great.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a characteristic diagram of the amount of ethylene glycol and -55 ° C / + 20 ° C electrolyte resistivity ratio.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273055A JP4520002B2 (en) | 2000-09-08 | 2000-09-08 | Electrolytic solution for driving aluminum electrolytic capacitors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273055A JP4520002B2 (en) | 2000-09-08 | 2000-09-08 | Electrolytic solution for driving aluminum electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002083746A JP2002083746A (en) | 2002-03-22 |
| JP4520002B2 true JP4520002B2 (en) | 2010-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000273055A Expired - Fee Related JP4520002B2 (en) | 2000-09-08 | 2000-09-08 | Electrolytic solution for driving aluminum electrolytic capacitors |
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| Country | Link |
|---|---|
| JP (1) | JP4520002B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415156A (en) * | 1977-07-05 | 1979-02-03 | Nissin Electric Co Ltd | Capacitor |
| JPH01103820A (en) * | 1987-10-16 | 1989-04-20 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2446422A1 (en) * | 1973-10-05 | 1975-04-17 | Gen Electric | LIQUID DIELECTRIC IMPRAEGNATION PREPARATION FOR ELECTRICAL APPARATUS |
| JP2625464B2 (en) * | 1988-02-02 | 1997-07-02 | ニチコン株式会社 | Electrolyte for driving electrolytic capacitors |
| JPH05347235A (en) * | 1992-06-12 | 1993-12-27 | Nichicon Corp | Electrolyte for electrolytic capacitor |
-
2000
- 2000-09-08 JP JP2000273055A patent/JP4520002B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415156A (en) * | 1977-07-05 | 1979-02-03 | Nissin Electric Co Ltd | Capacitor |
| JPH01103820A (en) * | 1987-10-16 | 1989-04-20 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
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| Publication number | Publication date |
|---|---|
| JP2002083746A (en) | 2002-03-22 |
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