JP2643345B2 - Electrolyte for aluminum electrolytic capacitors - Google Patents
Electrolyte for aluminum electrolytic capacitorsInfo
- Publication number
- JP2643345B2 JP2643345B2 JP21395288A JP21395288A JP2643345B2 JP 2643345 B2 JP2643345 B2 JP 2643345B2 JP 21395288 A JP21395288 A JP 21395288A JP 21395288 A JP21395288 A JP 21395288A JP 2643345 B2 JP2643345 B2 JP 2643345B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolyte
- aluminum electrolytic
- acid
- ethylene glycol
- electrolytic 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
- 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 本発明はアルミ電解コンデンサ用電解液に関するもの
である。Description: TECHNICAL FIELD The present invention relates to an electrolytic solution for an aluminum electrolytic capacitor.
従来の技術 従来、この種の電解液としては、火花発生電圧を比較
的高くできることからエチレングリコールに硼酸または
硼酸アンモニウムを溶解した電解液が用いられていた。
しかしこのような電解液は硼酸から直接放出される結晶
水と、エチレングリコールと硼酸とのエステル化によっ
て生ずる縮合水とで電解液中に多量の水分が生成し、そ
れ自身の蒸気圧及びアルミニウムとの水和反応により発
生するガスによりアルミ電解コンデンサのパッケージ内
の内圧を上昇し、これを破壊に至らしめるという問題が
あった。2. Description of the Related Art Conventionally, as this type of electrolyte, an electrolyte obtained by dissolving boric acid or ammonium borate in ethylene glycol has been used because a spark generation voltage can be relatively high.
However, in such an electrolytic solution, a large amount of water is generated in the electrolytic solution by water of crystallization directly released from boric acid and condensed water generated by esterification of ethylene glycol and boric acid, and its vapor pressure and aluminum There is a problem that the gas generated by the hydration reaction increases the internal pressure in the package of the aluminum electrolytic capacitor, which is destroyed.
このような問題点を解決するためにエチレングリコー
ルとのエステル化反応が比較的遅く、しかも高い火花電
圧が得られるアゼライン酸，セバシン酸等に代表される
直鎖高次カルボン酸またはその塩を用いた電解液が提案
されている。しかしこれらのカルボン酸ではエチレング
リコールに対する溶解性が悪く、比電導度が低いため
に、アルミ電解コンデンサの損失角の正接（tanδ）が
高いという問題点があった。In order to solve such a problem, a linear higher carboxylic acid represented by azelaic acid, sebacic acid or the like or a salt thereof, in which an esterification reaction with ethylene glycol is relatively slow and a high spark voltage is obtained. Electrolytes have been proposed. However, these carboxylic acids have poor solubility in ethylene glycol and low specific conductivity, and thus have a problem that the loss angle tangent (tan δ) of the aluminum electrolytic capacitor is high.
また、エチレングリコールに対する溶解性を高め、比
電導度をあげられる溶質としえ1,6デカンジカルボン酸,
5,6デカンジカルボン酸等の側鎖ジカルボン酸またはそ
の塩が知られているが、これらでもまだ比電導度的には
不充分であった。Also, it can increase the solubility in ethylene glycol and increase the specific conductivity.
Side chain dicarboxylic acids such as 5,6 decane dicarboxylic acid and salts thereof are known, but these still have insufficient specific conductivities.
発明が解決しようとする課題 本発明はこのような従来の課題を同時に解決するもの
であり、低損失でしかも高温において安定に動作し、か
つ火花発生電圧の高いアルミ電解コンデンサの中高圧用
電解液を提供するものである。Problems to be Solved by the Invention The present invention simultaneously solves such conventional problems, and operates at a low loss and stably at a high temperature, and has a high spark generation voltage. Is provided.
課題を解決するための手段 この課題を解決するために本発明においては、エチレ
ングリコールを主とした溶媒に、ゲラン酸またはその塩
を単独または一種類以上の他の溶質と共に溶解させたも
ので電解液を構成する。Means for Solving the Problems In order to solve this problem, in the present invention, gellanic acid or a salt thereof is dissolved alone or in combination with one or more other solutes in a solvent mainly containing ethylene glycol. Make up the liquid.
作用 本発明のゲラン酸は以下に示されるような不飽和側鎖
モノカルボン酸である。Action Gellanic acid of the present invention is an unsaturated side chain monocarboxylic acid as shown below.
このゲラン酸はエチレングリコールへの溶解性を高く
し得るメチル基の側鎖と不飽和結合を有し、比較的高い
比電導度と、しかもその分子量により適度の粘性から高
い火花電圧も得ることが出来る。 This gellanic acid has an unsaturated bond with the side chain of the methyl group that can increase the solubility in ethylene glycol, and can obtain a relatively high specific conductivity and, from its moderate viscosity, a high sparking voltage due to its molecular weight. I can do it.
実施例 以下本発明による実施例について述べる。EXAMPLES Examples according to the present invention will be described below.
第１図はゲラン酸のアンモニウム塩をエチレングリコ
ールに溶解した時の溶解量と30℃における比電導度の関
係を、従来の直鎖及び側鎖ジカルボン酸のアンモニウム
塩と比較した図であるがゲラン酸アンモニウムの溶解性
がきわめて高いことがわかる。FIG. 1 is a graph showing the relationship between the amount of gellanic acid ammonium salt dissolved in ethylene glycol and the specific conductivity at 30 ° C. compared with the conventional ammonium salt of linear and side chain dicarboxylic acid. It can be seen that the solubility of ammonium acid is extremely high.
また第１表に本発明の実施例と従来例との組成及び30
℃における比電導度，火花電圧，含水率についての特性
比較を示す。Table 1 shows the compositions of the examples of the present invention and the conventional examples.
A comparison of characteristics of specific conductivity, spark voltage and water content at ℃ is shown.
この第１表の結果から明らかな様にゲラン酸アンモニ
ウムを用いた電解液は、高い比電導度と火花電圧を示し
ていることが判る。 As is evident from the results in Table 1, it can be seen that the electrolytic solution using ammonium gellanate has a high specific conductivity and a high spark voltage.
第２表には第１表の組成に基づく本発明の実施例の電
解液を使ったアルミ電解コンデンサ（400V220μＦ）の1
05℃1000時間後の高温負荷試験結果を示す。サンプル数
は各ｎ＝５個で値は平均値である。Table 2 shows one of the aluminum electrolytic capacitors (400 V 220 μF) using the electrolyte of the embodiment of the present invention based on the composition of Table 1.
The results of a high-temperature load test after 1000 hours at 05 ° C are shown. The number of samples is n = 5, and the values are average values.
本発明の実施例の電解液を使ったものは、全ての特性
において改善されているが、とりわけtanδについてそ
の効果が顕著である。In the case of using the electrolytic solution of the embodiment of the present invention, all the characteristics are improved, but the effect is particularly remarkable for tan δ.
発明の効果 以上のように本発明は低損失で、しかも高温において
安定に動作し、かつ火花電圧の高い中高圧アルミ電解コ
ンデンサ用電解液を提供するもので、本発明の電解液を
使用することにより中高圧アルミ電解コンデンサの信頼
性を著しく向上させることが出来る。 Effect of the Invention As described above, the present invention provides an electrolyte for a medium-to-high pressure aluminum electrolytic capacitor with low loss, which operates stably at high temperature, and has a high spark voltage. As a result, the reliability of the medium-high voltage aluminum electrolytic capacitor can be remarkably improved.
第１図は従来の電解液と本発明の電解液の溶質のエチ
レングリコールに対する溶解量と比電導度の関係を示し
た特性図である。FIG. 1 is a characteristic diagram showing the relationship between the amount of solute dissolved in ethylene glycol and the specific conductivity of a conventional electrolytic solution and the electrolytic solution of the present invention.
Claims (1)
ラン酸またはその塩を単独または１種類以上の他の溶質
と共に溶解させたことを特徴とするアルミ電解コンデン
サ用電解液。1. An electrolytic solution for an aluminum electrolytic capacitor, wherein gellanic acid or a salt thereof is dissolved alone or together with at least one other solute in a solvent mainly composed of ethylene glycol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21395288A JP2643345B2 (en) | 1988-08-29 | 1988-08-29 | Electrolyte for aluminum electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21395288A JP2643345B2 (en) | 1988-08-29 | 1988-08-29 | Electrolyte for aluminum electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0262027A JPH0262027A (en) | 1990-03-01 |
| JP2643345B2 true JP2643345B2 (en) | 1997-08-20 |
Family
ID=16647770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21395288A Expired - Lifetime JP2643345B2 (en) | 1988-08-29 | 1988-08-29 | Electrolyte for aluminum electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2643345B2 (en) |
-
1988
- 1988-08-29 JP JP21395288A patent/JP2643345B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0262027A (en) | 1990-03-01 |
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