JPH0690992B2 - Electrolytic solution for electrolytic capacitors - Google Patents
Electrolytic solution for electrolytic capacitorsInfo
- Publication number
- JPH0690992B2 JPH0690992B2 JP21629088A JP21629088A JPH0690992B2 JP H0690992 B2 JPH0690992 B2 JP H0690992B2 JP 21629088 A JP21629088 A JP 21629088A JP 21629088 A JP21629088 A JP 21629088A JP H0690992 B2 JPH0690992 B2 JP H0690992B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic solution
- electrolytic
- vinyl acetate
- alcohol
- vinyl
- 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
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、耐圧特性に優れ、かつ電解液の調整を容易に
する電解コンデンサ用電解液に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution for an electrolytic capacitor, which has excellent pressure resistance and facilitates adjustment of the electrolytic solution.
従来の技術 アルミ電解コンデンサは、陽極酸化皮膜の厚さと電解液
が耐圧が使用電圧に耐えられるよう決定される。このた
め、高圧用のアルミ電解コンデンサを製作する上で電解
液の耐圧を向上させることは必要不可欠である。高耐圧
の電解液を得るために溶媒や添加物の検討が行われてき
た。電解液の耐圧を向上するものとしてポリビニルアル
コールとホウ酸を添加した電解液が特開昭60-91618号と
して公知である。2. Description of the Related Art Aluminum electrolytic capacitors are determined so that the thickness of the anodic oxide film and the withstand voltage of the electrolytic solution can withstand the working voltage. Therefore, it is indispensable to improve the withstand voltage of the electrolytic solution when manufacturing an aluminum electrolytic capacitor for high voltage. Solvents and additives have been studied in order to obtain a high-voltage electrolyte. An electrolytic solution in which polyvinyl alcohol and boric acid are added is known as JP-A-60-91618 for improving the withstand voltage of the electrolytic solution.
発明が解決しようとする課題 電解液に用いられるポリビニルアルコールは、水に対し
ては優れた溶解性を示すが、多価アルコール等の有機溶
媒には溶解能力が低い欠点がある。これはポリビニルア
ルコールの構造に起因している。ポリビニルアルコール
を溶解させる手段として溶媒の温度を極度に高め、激し
い攪拌を行わねばならず作業性が悪かった。Problems to be Solved by the Invention Polyvinyl alcohol used in an electrolytic solution has excellent solubility in water, but has a drawback that its solubility in organic solvents such as polyhydric alcohol is low. This is due to the structure of polyvinyl alcohol. As a means for dissolving polyvinyl alcohol, the temperature of the solvent has to be extremely raised and vigorous stirring has to be carried out, resulting in poor workability.
課題を解決するための手段 本発明の電解コンデンサの電解液は、多価アルコールを
溶媒とする有機酸系電解液を用い、この有機酸系電解液
に酢酸ビニルとビニルアルコールの共重合体を添加する
ことを特徴とするものである。Means for Solving the Problems As the electrolytic solution of the electrolytic capacitor of the present invention, an organic acid electrolytic solution using a polyhydric alcohol as a solvent is used, and a copolymer of vinyl acetate and vinyl alcohol is added to the organic acid electrolytic solution. It is characterized by doing.
この酢酸ビニルとビニルアルコールの共重合体におい
て、酢酸ビニルの割合は10〜40％にするとよい。In this copolymer of vinyl acetate and vinyl alcohol, the proportion of vinyl acetate is preferably 10-40%.
作用 本発明の電解コンデンサの電解液に、酢酸ビニルとビニ
ルアルコールの共重合体を添加することによりポリマー
中にアセチル基が適当に導入され、水酸基同志の静電的
な結合が阻止される。このため、ポリビニルアルコール
の結晶が著しく低下し、多価アルコールへの溶解速度が
増し電解液の調整を迅速に行うことが可能になる。Action By adding a copolymer of vinyl acetate and vinyl alcohol to the electrolytic solution of the electrolytic capacitor of the present invention, an acetyl group is appropriately introduced into the polymer and electrostatic coupling between hydroxyl groups is prevented. Therefore, the crystals of polyvinyl alcohol are remarkably reduced, the dissolution rate in the polyhydric alcohol is increased, and the electrolytic solution can be adjusted quickly.
実施例 第１図は、エチレングリコール等の多価アルコールに対
し、５重量％のポリマーを溶かしたときの、酢酸ビニル
とビニルアルコール添加の割合における溶解時間（温度
150℃）との関係を示すグラフである。ポリマーの多価
アルコールへの溶解速度が、酢酸ビニルの添加割合に依
存していることがわかる。ポリマーが多価アルコールに
対し良好なる溶解性を示す酢酸ビニルの添加割合の範囲
は10〜40重量％である。10重量％以下の領域では、ポリ
マー中に存在する水酸基同志の静電的な結合が強まり、
40重量％以上の領域では疎水性のアセチル基が多く存在
するために、ビニルアルコールの溶解速度は極めて遅く
なる。このように、ビニルアルコールのケン化度を調節
することにより各種の多価アルコールへの溶解性を改善
することができ、電解液調整時間の短縮化が可能とな
る。Example FIG. 1 shows the dissolution time (temperature) at the rate of addition of vinyl acetate and vinyl alcohol when 5% by weight of a polymer was dissolved in a polyhydric alcohol such as ethylene glycol.
It is a graph showing the relationship with (150 ° C). It can be seen that the dissolution rate of the polymer in the polyhydric alcohol depends on the addition ratio of vinyl acetate. The addition ratio of vinyl acetate showing good solubility of the polymer in the polyhydric alcohol is 10 to 40% by weight. In the range of 10% by weight or less, the electrostatic bond between the hydroxyl groups existing in the polymer is strengthened,
In the region of 40% by weight or more, the dissolution rate of vinyl alcohol is extremely slow because many hydrophobic acetyl groups are present. As described above, by adjusting the saponification degree of vinyl alcohol, the solubility in various polyhydric alcohols can be improved, and the electrolyte solution adjustment time can be shortened.
表１は、エチレングリコールを溶媒とし、ブチルオクタ
ンニ酸アンモン及びカプリル酸アンモンを電解質とした
電解液とこれに酢酸ビニルとビニルアルコールの共重合
体を添加した電解液の比抵抗値と火花電圧を比較したも
のである。比抵抗の増加はなく火花電圧を大幅に上昇さ
せることができた。Table 1 shows the specific resistance value and the spark voltage of an electrolytic solution using ethylene glycol as a solvent and ammonium butyloctanoate and ammonium caprylate as electrolytes and an electrolytic solution obtained by adding a copolymer of vinyl acetate and vinyl alcohol to the electrolytic solution. It is a comparison. There was no increase in the specific resistance, and the spark voltage could be greatly increased.
発明の効果 本発明の電解液は、酢酸ビニルとビニルアルコールの共
重合体を添加することにより、電解液の調整が容易で、
かつ耐圧特性の優れた高圧用の電解液が得られた。 Effect of the Invention The electrolytic solution of the present invention is easy to adjust by adding a copolymer of vinyl acetate and vinyl alcohol,
Moreover, an electrolytic solution for high voltage having excellent pressure resistance was obtained.
第１図は、酢酸ビニルを添加した割合における多価アル
コールの溶解時間を示す曲線図である。FIG. 1 is a curve diagram showing the dissolution time of polyhydric alcohol in the proportion of vinyl acetate added.
Claims (2)
液に酢酸ビニルとビニルアルコールの共重合体を添加す
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, characterized in that a copolymer of vinyl acetate and vinyl alcohol is added to an organic acid-based electrolytic solution using a polyhydric alcohol as a solvent.
ルアルコールの共重合体における酢酸ビニルの添加割合
が10〜40％である電解コンデンサ用電解液。2. An electrolytic solution for an electrolytic capacitor according to claim 1, wherein the vinyl acetate addition ratio in the copolymer of vinyl acetate and vinyl alcohol is 10 to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21629088A JPH0690992B2 (en) | 1988-09-01 | 1988-09-01 | Electrolytic solution for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21629088A JPH0690992B2 (en) | 1988-09-01 | 1988-09-01 | Electrolytic solution for electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0266919A JPH0266919A (en) | 1990-03-07 |
| JPH0690992B2 true JPH0690992B2 (en) | 1994-11-14 |
Family
ID=16686218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21629088A Expired - Lifetime JPH0690992B2 (en) | 1988-09-01 | 1988-09-01 | Electrolytic solution for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0690992B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3705864B2 (en) * | 1996-05-09 | 2005-10-12 | ニチコン株式会社 | Electrolytic solution for electrolytic capacitor drive |
| JP4699649B2 (en) * | 2001-08-23 | 2011-06-15 | ニチコン株式会社 | Electrolytic solution for electrolytic capacitor drive |
-
1988
- 1988-09-01 JP JP21629088A patent/JPH0690992B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0266919A (en) | 1990-03-07 |
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