JPH0693418B2 - Electrolytic solution for electrolytic capacitors - Google Patents
Electrolytic solution for electrolytic capacitorsInfo
- Publication number
- JPH0693418B2 JPH0693418B2 JP11214290A JP11214290A JPH0693418B2 JP H0693418 B2 JPH0693418 B2 JP H0693418B2 JP 11214290 A JP11214290 A JP 11214290A JP 11214290 A JP11214290 A JP 11214290A JP H0693418 B2 JPH0693418 B2 JP H0693418B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic
- acid
- electrolytic solution
- phosphoric acid
- capacitors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は中高圧用の電解コンデンサ用電解液に関する。TECHNICAL FIELD The present invention relates to an electrolytic solution for medium- and high-voltage electrolytic capacitors.
（従来の技術） 電子機器には、種々の特徴を有する電解コンデンサが用
いられている。例えば、スイッチング周波数の高い安定
化電源には、高周波に対して低インピーダンス特性を有
し、上限使用温度の高い電解コンデンサが使われる。(Prior Art) Electrolytic capacitors having various characteristics are used in electronic devices. For example, a stabilized power supply with a high switching frequency uses an electrolytic capacitor having a low impedance characteristic with respect to a high frequency and a high upper limit operating temperature.
この条件を満たす電解コンデンサには、1.6−デカンジ
カルボン酸やアゼライン酸、セバシン酸、1.10−デカン
ジカルボン酸等の有機二塩基性酸のアンモニウム塩を主
な溶質とする電解液が含浸されている。特に、有機二塩
基性酸のなかでも側鎖にアルキル基を有する長鎖二塩基
性酸が中高圧用として優れている。An electrolytic capacitor satisfying this condition is impregnated with an electrolytic solution containing an ammonium salt of an organic dibasic acid such as 1.6-decanedicarboxylic acid, azelaic acid, sebacic acid or 1.10-decanedicarboxylic acid as a main solute. In particular, among organic dibasic acids, long-chain dibasic acids having an alkyl group in the side chain are excellent for medium and high pressure.
（発明が解決しようとする課題） しかし、鎖側にアルキル基を有する長鎖二塩基性酸は、
長期間高温状態におくと、一部が低級カルボン酸に分解
するために、電解液の化成性が低下する。そのためにコ
ンデンサは、耐圧が低下し、漏れ電流（以下LCと略す）
が増大し、ガスを発生し易くなり、防爆弁が作動して容
易に不良になる。(Problems to be solved by the invention) However, a long-chain dibasic acid having an alkyl group on the chain side is
When it is kept at a high temperature for a long period of time, a part of it is decomposed into lower carboxylic acid, so that the chemical conversion property of the electrolytic solution is lowered. Therefore, the breakdown voltage of the capacitor is reduced, and the leakage current (abbreviated as LC below)
, The gas is likely to be generated, and the explosion-proof valve operates to easily cause a failure.
本発明の目的は、以上の欠点を改良し、コンデンサのLC
や耐圧を改善できガス発生を抑制できる電解コンデンサ
用電解液を提供するものである。The object of the present invention is to remedy the above drawbacks and to improve the LC of capacitors.
It is intended to provide an electrolytic solution for an electrolytic capacitor which can improve the withstand voltage and suppress gas generation.
（課題を解決するための手段） 本発明は、上記の目的を達成するために、多価アルコー
ル類を主体とする溶媒に、炭素数12で側鎖にアルキル基
を有する長鎖二塩基性酸またはその塩の少なくとも１種
類を溶解した電解コンデンサ用電解液において、Ｐ−ニ
トロ安息香酸またはその塩のうち少なくとも１種類と、
リン酸の縮重合体またはリン酸エステルの縮重合体のう
ち少なくとも１種類とを添加することを特徴とする電解
コンデンサ用電解液を提供するものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a solvent mainly composed of polyhydric alcohols, a long-chain dibasic acid having 12 carbon atoms and an alkyl group in a side chain. Alternatively, in an electrolytic solution for an electrolytic capacitor in which at least one kind of its salt is dissolved, at least one kind of P-nitrobenzoic acid or its salt,
The present invention provides an electrolytic solution for an electrolytic capacitor, which comprises adding at least one of a polycondensate of phosphoric acid and a polycondensate of phosphoric acid ester.
（作用） Ｐ−ニトロ安息香酸やＰ−ニトロ安息香酸アンモニウム
を用いることにより、側鎖にアルキル基を有する長鎖二
塩基性酸が低級カルボル酸に分解する反応を抑制でき
る。そのために、コンデンサのLCの増加や耐圧の低下を
おさえることができる。また、Ｐ−ニトロ安息香酸等
は、電極箔表面で還元されるため、水素ガスの発生を抑
制できる。(Function) By using P-nitrobenzoic acid or ammonium P-nitrobenzoate, it is possible to suppress the reaction of a long-chain dibasic acid having an alkyl group in its side chain to decompose into lower carboxylic acid. Therefore, it is possible to suppress increase of LC and decrease of withstand voltage of the capacitor. Moreover, since P-nitrobenzoic acid and the like are reduced on the surface of the electrode foil, generation of hydrogen gas can be suppressed.
リン酸やリン酸エステルの縮重合体は、アルミニウムイ
オンと反応して電極表面に緻密な保護膜を形成する。こ
の保護膜は高温下においても比較的安定しており、従っ
て、酸化皮膜の耐水性を向上でき、コンデンサのLC増加
をおさえることができる。また、ガス発生も抑制でき
る。The condensation polymer of phosphoric acid or phosphoric acid ester reacts with aluminum ions to form a dense protective film on the electrode surface. This protective film is relatively stable even at high temperatures, so that the water resistance of the oxide film can be improved and the increase in LC of the capacitor can be suppressed. Also, gas generation can be suppressed.
（実施例） 以下、本発明を実施例に基づいて説明する。(Example) Hereinafter, the present invention will be described based on examples.
溶媒はエチレングリコールやジエチレングリコール等の
多価アルコールを主成分として用いる。As the solvent, a polyhydric alcohol such as ethylene glycol or diethylene glycol is used as a main component.
溶質は、炭素12で側鎖にアルキル基を有する長鎖二塩基
性酸またはその塩のうち少なくとも１種類を用いる。こ
れ等の物質には、例えば、1.6−デカンジカルボン酸、
2.5−デカンジカルボン酸、5.6−デカンジカルボン酸、
6.7−デカンジカルボン酸、６−エチル−1.6−オクタン
ジカルボン酸やそれ等の塩がある。As the solute, at least one kind of long-chain dibasic acid having carbon 12 and an alkyl group in a side chain or a salt thereof is used. These substances include, for example, 1.6-decanedicarboxylic acid,
2.5-decanedicarboxylic acid, 5.6-decanedicarboxylic acid,
There are 6.7-decanedicarboxylic acid, 6-ethyl-1.6-octanedicarboxylic acid and salts thereof.
そしてこの溶媒及び溶質からなる液にＰ−ニトロ安息香
酸またはＰ−ニトロ安息香酸アンモニウムを添加する。
なお、これ等の添加量は、0.05〜3.0wt％が好ましく、
0.05wt％未満では効果が低く、3.0wt％より多くなると
火花電圧が低下する。Then, P-nitrobenzoic acid or ammonium P-nitrobenzoate is added to the liquid containing the solvent and the solute.
The addition amount of these is preferably 0.05 to 3.0 wt%,
If it is less than 0.05 wt%, the effect is low, and if it is more than 3.0 wt%, the spark voltage decreases.
また、リン酸の縮重合体またはリン酸エステルの縮重合
体を添加する。これ等の添加量は、0.01〜10.0wt％が好
ましく、0.01wt％未満では効果が低く、10.0wt％を越え
ると火花電圧が低下する。Further, a condensation polymer of phosphoric acid or a condensation polymer of phosphoric acid ester is added. The addition amount of these is preferably 0.01 to 10.0 wt%, and if less than 0.01 wt%, the effect is low, and if it exceeds 10.0 wt%, the spark voltage decreases.
次に、表１の通りの組成からなる実施例と従来例の電解
液を含浸した、定格450V、330μＦのアルミ電解コンデ
ンサについて高温負荷試験を行ない、LC及び耐圧を測定
した。高温負荷試験条件は、温度110℃、印加電圧400V.
DCとする。LCは、試料を温度20℃の雰囲気中に24hr放置
後、電圧450V.DCを印加し、５分後の値を測定する。ま
た、耐圧は、LC測定後の試料を定電流6mAで昇圧し、破
壊に至る電圧とする。Next, a high temperature load test was performed on aluminum electrolytic capacitors rated at 450 V and 330 μF, which were impregnated with the electrolytic solutions of Examples and Conventional Examples having the compositions shown in Table 1, and LC and withstand voltage were measured. The high temperature load test conditions are a temperature of 110 ° C and an applied voltage of 400V.
DC. For the LC, the sample is left in an atmosphere at a temperature of 20 ° C. for 24 hours, a voltage of 450 V.DC is applied, and the value after 5 minutes is measured. The withstand voltage is the voltage at which the sample after LC measurement is stepped up with a constant current of 6 mA and is destroyed.
測定結果は表２に示した。The measurement results are shown in Table 2.
表２から明らかな通り、LCについては、6000hr放置後、
実施例１〜実施例８は31〜40μＡ、従来例１〜従来例５
は270〜790μＡとなり、前者は後者の約４〜15％に低減
できる。また、耐圧についても、6000hr放置後、実施例
１〜実施例８は525〜620V、従来例１〜従来例５が460〜
580Vとなり全体的に前者の方が高い値を示している。 As is clear from Table 2, for LC, after being left for 6000 hours,
Examples 1 to 8 are 31 to 40 μA, Conventional Example 1 to Conventional Example 5
Is 270 to 790 μA, and the former can be reduced to about 4 to 15% of the latter. Regarding the pressure resistance, after being left for 6000 hours, 525 to 620 V in Examples 1 to 8 and 460 to in Conventional Example 1 to Conventional Example 5
The value is 580V, and the former shows a higher value overall.
（発明の効果） 以上の通り、本発明によれば、Ｐ−ニトロ安息香酸やそ
の塩、リン酸またはリン酸エステルの縮重合体を添加す
ることにより、高温下におけるLCの増大や耐圧の低下を
抑制できる。また、水素ガスの発生を抑制できるため
に、コンデンサの寿命を延長できる電解コンデンサ用電
解液が得られる。(Effects of the Invention) As described above, according to the present invention, by adding P-nitrobenzoic acid or a salt thereof, a polycondensation polymer of phosphoric acid or a phosphoric acid ester, increase of LC and decrease of pressure resistance at high temperature are achieved. Can be suppressed. Further, since the generation of hydrogen gas can be suppressed, an electrolytic solution for an electrolytic capacitor can be obtained which can extend the life of the capacitor.
Claims (1)
素数12で側鎖にアルキル基を有する長鎖二塩基性酸また
はその塩の少なくとも１種類を溶解した電解コンデンサ
用電解液において、Ｐ−ニトロ安息香酸またはその塩の
うち少なくとも１種類と、リン酸の縮重合体またはリン
酸エステルの縮重合体のうち少なくとも１種類とを添加
することを特徴とする電解コンデンサ用電解液。1. An electrolytic solution for an electrolytic capacitor, wherein at least one kind of a long-chain dibasic acid having 12 carbon atoms and an alkyl group in a side chain or a salt thereof is dissolved in a solvent mainly composed of polyhydric alcohols, An electrolytic solution for an electrolytic capacitor, which comprises adding at least one of P-nitrobenzoic acid or a salt thereof and at least one of a condensation polymer of phosphoric acid or a condensation polymer of phosphoric acid ester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11214290A JPH0693418B2 (en) | 1990-04-27 | 1990-04-27 | Electrolytic solution for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11214290A JPH0693418B2 (en) | 1990-04-27 | 1990-04-27 | Electrolytic solution for electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0410512A JPH0410512A (en) | 1992-01-14 |
| JPH0693418B2 true JPH0693418B2 (en) | 1994-11-16 |
Family
ID=14579271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11214290A Expired - Lifetime JPH0693418B2 (en) | 1990-04-27 | 1990-04-27 | Electrolytic solution for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693418B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06204091A (en) * | 1992-12-29 | 1994-07-22 | Hitachi Aic Inc | Electrolyte for electrolytic capacitor |
| JP7010351B1 (en) * | 2020-09-30 | 2022-01-26 | 日本ケミコン株式会社 | Cathode and electrolytic capacitors |
| JP2024010870A (en) | 2022-07-13 | 2024-01-25 | 日本ケミコン株式会社 | Electrolytic capacitor |
-
1990
- 1990-04-27 JP JP11214290A patent/JPH0693418B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0410512A (en) | 1992-01-14 |
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