JP3499639B2 - Electrolyte for driving electrolytic capacitors - Google Patents
Electrolyte for driving electrolytic capacitorsInfo
- Publication number
- JP3499639B2 JP3499639B2 JP06452695A JP6452695A JP3499639B2 JP 3499639 B2 JP3499639 B2 JP 3499639B2 JP 06452695 A JP06452695 A JP 06452695A JP 6452695 A JP6452695 A JP 6452695A JP 3499639 B2 JP3499639 B2 JP 3499639B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic solution
- acid
- electrolyte
- electrolytic
- salt
- 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 - Fee Related
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、電解コンデンサの駆動
用電解液、特に中高圧用アルミ電解コンデンサの駆動用
電解液に関し、耐電圧の向上および高温での寿命特性の
長期安定化を実現した電解コンデンサの駆動用電解液
（以下、電解液という）に関するものである。
【０００２】
【従来の技術】従来、特に中高圧用のアルミニウム電解
コンデンサの電解液としては、エチレングリコールにホ
ウ酸あるいはホウ酸アンモニウムを溶解した、いわゆる
エチレングリコールホウ酸系の電解液が８５℃用電解コ
ンデンサに多用されている。この種の電解液は、難燃性
という優れた特性を有する反面、ホウ酸とエチレングリ
コールとのエステル化反応によるエステル化水の発生お
よびこれに起因した水素ガスの発生により、１０５℃用
電解コンデンサへの対応が困難な状況にあった。一方、
高温下での耐電圧性を向上させる目的で炭素数が８から
２２である二塩基酸のアンモニウム塩を使用した電解液
も知られている。後者においては、モノカルボン酸であ
るにもかかわらず、化成性に優れ、かつベンゼン環を持
っていることで高温下で安定な安息香酸またはその塩と
組み合わせて用いられている。このような二塩基酸のア
ンモニウム塩に安息香酸またはその塩を組み合わせてエ
チレングリコールに溶解された電解液においては、耐熱
性の面で大幅な改善効果が認められるものの、高温下で
はエステル化を経てアミド化した析出物が電極表面を覆
うことによる容量減少及びtanδの増大を避けることが
出来なかった。また、安息香酸の熱的安定性は非常に優
れているものの、耐電圧的に限界があった。
【０００３】
【発明が解決しようとする課題】本発明は上記の問題点
を解決するため、電解液を改良することにより、初期の
tanδ値を低く抑えるとともに、高温下での容量変化及び
tanδ増加を長期にわたって小さく抑えることができ、か
つ耐電圧性をも改善した中高圧用コンデンサを提供する
ことを目的としている。
【０００４】
【課題を解決するための手段】本発明は上記の課題を解
決するため、多価アルコールを主溶媒とした電解コンデ
ンサ用電解液において、化２で示されるベンゼン基を有
するモノカルボン酸、またはその塩を溶解させたことを
特徴としている。即ち、エチレングリコール，１，３−
プロパンジオールを主体として用いた溶媒に、化１に示
した酸またはその塩（塩としてはアンモニウム塩が一般
的）のいずれか一種類以上を溶質として溶解させた電解
液である。
【０００５】
【化２】
【０００６】
【作用】ベンゼン環に付加しているカルボキシル基を含
む側鎖の炭素数が安息香酸より大きいことにより、電解
液の耐電圧が向上する。また、ベンゼン環がπ電子結合
により形成されていることから高温での電解液の安定性
が保持される。更に二塩基酸のアンモニウム塩のエステ
ル化反応が安息香酸による場合よりも緩和されるので、
アミド化した析出物による容量減少及びtanδ増大が抑
えられる。
【０００７】
【実施例】以下、本発明の具体的実施例について記す。
表１は本発明の実施例及び従来例の中高圧用電解液の組
成、比抵抗および火花発生電圧について比較した結果を
示す。表１において、電解液試料記号Ａは従来例、Ｂ，
Ｃ，Ｄ，Ｅは本発明の実施例、Ｆは参考例である。
【０００８】
【表１】
【０００９】表１から明らかなように、従来例に使用し
た安息香酸アンモニウムとほぼ等モルの化１に示すアン
モニウム塩を用いると、比抵抗の変化はごくわずかであ
るのに対して、耐電圧の向上は大きい。
【０００９】このように、本発明における好ましい実施
態様は、中圧用ではエチレングリコールを主体とし、水
分を１重量％から８重量％含む溶媒に、アゼライン酸の
塩類あるいはセバシン酸等の高級二塩基酸の塩類ととも
に、本発明による化１に示した酸あるいはそのアンモニ
ウム塩を溶解させた電解液である。また必要に応じて、
ホウ酸、マンニット、亜燐酸、次亜リン酸もしくはその
塩を添加すると、更に特性を改善することができる。
【００１０】化１に示した酸あるいはその塩の溶解量
は、０．５ｗｔ％から１０ｗｔ％の範囲が良い。０．５
ｗｔ％未満の場合には耐電圧を向上させる効果を奏せ
ず、また１０ｗｔ％を超えると火花発生電圧が低下して
しまう。
【００１１】なお、これらの実施例以外にも、他の溶質
との混合、あるいは低温特性の改善のためエチレングリ
コールの一部を２−エチル−１，３−ヘキサンジオール
に置き換えるなど、多枝にわたる応用が可能である。
【００１２】
【発明の効果】以上のように、多価アルコールを主溶媒
とした電解コンデンサ用電解液において、本発明による
前記の一般式で表されるベンジル基を有するモノカルボ
ン酸またはその塩を溶質とした電解液は、電解液の耐電
圧を向上させることが可能であり、また、高温での電解
液の安定性を保持することができるので、工業的ならび
に実用的価値の大なるものである。Description: 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 aluminum electrolytic capacitor for medium and high pressures. The present invention relates to an electrolytic solution for driving an electrolytic capacitor (hereinafter, referred to as an electrolytic solution) that realizes long-term stabilization of the life characteristics of the electrolytic capacitor. 2. Description of the Related Art Conventionally, so-called ethylene glycol boric acid-based electrolytes in which boric acid or ammonium borate is dissolved in ethylene glycol are used as electrolytes for aluminum electrolytic capacitors for medium and high pressures, especially for 85 ° C. It is widely used for electrolytic capacitors. This type of electrolytic solution has excellent characteristics of flame retardancy, but on the other hand, the generation of esterified water by the esterification reaction between boric acid and ethylene glycol and the generation of hydrogen gas resulting therefrom, the electrolytic capacitor for 105 ° C. The situation was difficult to deal with. on the other hand,
An electrolytic solution using an ammonium salt of a dibasic acid having 8 to 22 carbon atoms for the purpose of improving the withstand voltage at high temperatures is also known. In the latter, despite being a monocarboxylic acid, they are used in combination with benzoic acid or a salt thereof, which is excellent in chemical conversion properties and has a benzene ring, which is stable at high temperatures. In an electrolytic solution obtained by dissolving benzoic acid or a salt thereof in ethylene glycol in combination with an ammonium salt of such a dibasic acid, although a significant improvement effect is observed in terms of heat resistance, the ester solution undergoes esterification at a high temperature. The reduction in capacity and the increase in tan δ due to the amidated precipitate covering the electrode surface could not be avoided. Although benzoic acid has very good thermal stability, it has a limit in withstand voltage. [0003] The present invention solves the above-mentioned problems by improving the electrolyte solution to improve the initial solution.
While keeping the tan δ value low, capacity change at high temperature and
It is an object of the present invention to provide a medium- and high-voltage capacitor that can suppress the increase in tan δ over a long period of time and has improved withstand voltage. [0004] In order to solve the above-mentioned problems, the present invention relates to a monocarboxylic acid having a benzene group represented by Chemical formula 2 in an electrolytic solution for an electrolytic capacitor using a polyhydric alcohol as a main solvent. Or a salt thereof is dissolved. That is, ethylene glycol, 1,3-
This is an electrolytic solution in which at least one of the acids shown in Chemical Formula 1 or salts thereof (generally ammonium salts) is dissolved as a solute in a solvent mainly containing propanediol. [0005] When the number of carbon atoms in the side chain containing the carboxyl group added to the benzene ring is larger than that of benzoic acid, the withstand voltage of the electrolytic solution is improved. Further, since the benzene ring is formed by π-electron bonds, the stability of the electrolytic solution at high temperatures is maintained. Further, since the esterification reaction of the ammonium salt of the dibasic acid is moderated compared to the case of using benzoic acid,
A decrease in capacity and an increase in tan δ due to amidated precipitates are suppressed. Hereinafter, specific examples of the present invention will be described.
Table 1 shows the results of comparison of the composition, specific resistance, and spark generation voltage of the electrolytes of Examples of the present invention and conventional examples for medium and high pressures. In Table 1, electrolyte sample symbol A is a conventional example, and B,
C, D, and E are examples of the present invention, and F is a reference example. [Table 1] As is evident from Table 1, when the ammonium salt shown in Chemical Formula 1 is used in an almost equimolar amount to the ammonium benzoate used in the conventional example, the change in the specific resistance is very small, while the withstand voltage is small. The improvement is great. Thus, in a preferred embodiment of the present invention, a medium containing ethylene glycol for medium pressure and containing 1 to 8% by weight of water is added to a salt of azelaic acid or a higher dibasic acid such as sebacic acid. An electrolyte in which the acid shown in Chemical Formula 1 or its ammonium salt is dissolved together with the salts of the present invention. Also, if necessary,
The properties can be further improved by adding boric acid, mannite, phosphorous acid, hypophosphorous acid or salts thereof. The amount of the acid or the salt thereof shown in Chemical formula 1 is preferably in the range of 0.5 wt% to 10 wt%. 0.5
If it is less than wt%, the effect of improving the withstand voltage will not be exhibited, and if it exceeds 10 wt%, the spark generation voltage will decrease. [0011] In addition to these examples, it is also possible to mix with other solutes or replace ethylene glycol with 2-ethyl-1,3-hexanediol to improve low-temperature characteristics. Application is possible. As described above, a monocarboxylic acid having a benzyl group represented by the above general formula or a salt thereof according to the present invention is used in an electrolytic solution for an electrolytic capacitor using a polyhydric alcohol as a main solvent. The solute electrolytic solution can improve the withstand voltage of the electrolytic solution and can maintain the stability of the electrolytic solution at a high temperature, so that it has great industrial and practical value. is there.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01G 9/035 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H01G 9/035
Claims (1)
デンサ駆動用電解液において、化１で示されるベンジル
基を有するモノカルボン酸、またはその塩を溶解するこ
とを特徴とする電解コンデンサ駆動用電解液。 【化１】 (57) [Claim 1] Dissolving a monocarboxylic acid having a benzyl group represented by Chemical Formula 1 or a salt thereof in an electrolytic solution for driving an electrolytic capacitor using a polyhydric alcohol as a main solvent. An electrolytic solution for driving an electrolytic capacitor. Embedded image
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06452695A JP3499639B2 (en) | 1995-03-23 | 1995-03-23 | Electrolyte for driving electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06452695A JP3499639B2 (en) | 1995-03-23 | 1995-03-23 | Electrolyte for driving electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08264388A JPH08264388A (en) | 1996-10-11 |
| JP3499639B2 true JP3499639B2 (en) | 2004-02-23 |
Family
ID=13260759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06452695A Expired - Fee Related JP3499639B2 (en) | 1995-03-23 | 1995-03-23 | Electrolyte for driving electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3499639B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4653354B2 (en) * | 2001-08-10 | 2011-03-16 | ニチコン株式会社 | Electrolytic solution for electrolytic capacitor drive |
| EP2555619A2 (en) | 2010-04-06 | 2013-02-13 | Bayer Intellectual Property GmbH | Use of 4-phenylbutyric acid and/or the salts thereof for enhancing the stress tolerance of plants |
-
1995
- 1995-03-23 JP JP06452695A patent/JP3499639B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08264388A (en) | 1996-10-11 |
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