JPH0719730B2 - Electrolytic solution for electrolytic capacitors - Google Patents
Electrolytic solution for electrolytic capacitorsInfo
- Publication number
- JPH0719730B2 JPH0719730B2 JP30019488A JP30019488A JPH0719730B2 JP H0719730 B2 JPH0719730 B2 JP H0719730B2 JP 30019488 A JP30019488 A JP 30019488A JP 30019488 A JP30019488 A JP 30019488A JP H0719730 B2 JPH0719730 B2 JP H0719730B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic solution
- electrolytic
- boric acid
- capacitors
- silicon
- 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
- Compositions Of Macromolecular Compounds (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 本発明は電解コンデンサ用電解液に関し、特に難燃性に
注目した電解コンデンサ用電解液に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution for an electrolytic capacitor, and more particularly to an electrolytic solution for an electrolytic capacitor that focuses on flame retardancy.
従来の技術 一般に電解コンデンサ用電解液は、エチレングリコール
等の有機溶媒を主体に構成されているため、溶質に硼酸
を多量に用いている無機酸系の電解液を別にすれば可燃
性のものが多かった。2. Description of the Related Art Generally, an electrolytic solution for an electrolytic capacitor is mainly composed of an organic solvent such as ethylene glycol, so that it is flammable except for an inorganic acid-based electrolytic solution that uses a large amount of boric acid as a solute. There were many.
しかし、コンデンサの安全性が厳しく要求されるように
なり、コンデンサが破壊しても火災の発生がなきよう、
コンデンサの難燃化が要望されている。However, the safety of capacitors has become strict, and even if the capacitors are destroyed, no fire will occur.
There is a demand for flame retardant capacitors.
公知のエチレングリコール−硼酸系の電解液は難燃性を
有し、硼酸量が増加すると自己消火性を示す。このため
高圧用の大型機種には現在も使用されている。Known ethylene glycol-boric acid-based electrolytes have flame retardancy, and exhibit self-extinguishing properties when the amount of boric acid increases. Therefore, it is still used in large models for high pressure.
発明が解決しようとする課題 エチレングリコール−硼酸系の電解液は、エステル化に
よる水分の生成量が多く、陽極酸化被膜を著しく劣化さ
せること、また、電解液自体の比抵抗が、有機酸アンモ
ニウム塩を溶質とする電解液と対比して大きいという欠
点を有している。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An ethylene glycol-boric acid-based electrolytic solution has a large amount of water produced by esterification, which significantly deteriorates the anodized film, and the specific resistance of the electrolytic solution itself is an organic acid ammonium salt It has a drawback that it is large in comparison with an electrolytic solution containing solute.
最近500WV、550WVといった超高圧用の製品が要求されて
いる。高圧になるほど危険性が増大するので、難燃性は
強く要望されている。しかし従来の無機酸系では良好な
特性をもった電解液は開発が難しかった。Recently, products for ultra-high voltage such as 500WV and 550WV are required. Flame retardancy is strongly desired because the higher the pressure, the greater the danger. However, it has been difficult to develop an electrolytic solution having good characteristics with conventional inorganic acid type.
課題を解決するための手段 本発明は比抵抗の顕著な増大がなく、難燃性を図れ、か
つ耐圧の向上を可能とする電解液を提供する。Means for Solving the Problems The present invention provides an electrolytic solution which has no significant increase in specific resistance, is flame retardant, and is capable of improving withstand voltage.
本発明の電解液は、エチレングリコール等の多価アルコ
ール類を主体とする電解液中に、ケイ素含有ポリビニー
ルアルコールと硼酸又はその塩を溶解するものである。The electrolytic solution of the present invention is one in which a silicon-containing polyvinyl alcohol and boric acid or a salt thereof are dissolved in an electrolytic solution mainly composed of polyhydric alcohols such as ethylene glycol.
特にケイ素含有ポリビニールアルコールのケイ素含有率
が0.1−５重量％、重合度200−1500で、その添加量が0.
5〜８重量％のものがよい。Especially, the silicon content of silicon-containing polyvinyl alcohol is 0.1-5% by weight, the degree of polymerization is 200-1500, and the addition amount is 0.
5-8% by weight is preferable.
作用 ケイ素は化合物が電解液の成分として使用されることは
なかった。それはケイ素化合物が多価アルコールに対
し、溶解度が非常に小さいことが原因である。Action Silicon was never used as a component of the electrolyte. This is because the silicon compound has a very low solubility in the polyhydric alcohol.
本発明で用いるケイ素含有ポリビニールアルコールは、
多価アルコールに溶解し、硼酸を添加することによっ
て、ポリビニルアルコールと同様の耐圧向上効果があ
る。さらに、硼酸と共に燃焼したとき、ケイ素、硼酸、
酸素及び炭素によってガラス状の不燃化物質を形成す
る。The silicon-containing polyvinyl alcohol used in the present invention is
By dissolving in polyhydric alcohol and adding boric acid, the same effect of improving pressure resistance as that of polyvinyl alcohol can be obtained. Furthermore, when burned with boric acid, silicon, boric acid,
A glassy incombustible is formed by oxygen and carbon.
従って、本発明の電解液を素子に含浸し、これを着火さ
せると表面の電解液が燃焼により反応し、素子の表面に
ガラス状被膜を形成し消火作用がある。この後炎を近付
けても不燃性被膜によって着火することはない。Therefore, when the element is impregnated with the electrolytic solution of the present invention and ignited, the electrolytic solution on the surface reacts by combustion to form a glassy film on the surface of the element, which has a fire extinguishing action. After this, even if the flame is brought close to it, the nonflammable coating does not ignite.
硼酸は、電解紙の炭化を促進する働きを有し、エチレン
グリコールとの生成水が着火しにくいが、自己消火性を
もたせるためには多量の硼酸を必要とする。しかし、本
発明における硼酸の量は少くてよく、有機酸系の電解液
に対しても有効であり、難燃性の向上、特性の改善の両
効果が得られる。Boric acid has a function of promoting carbonization of electrolytic paper, and the generated water with ethylene glycol is difficult to ignite, but a large amount of boric acid is required to have self-extinguishing property. However, the amount of boric acid used in the present invention may be small, and it is effective for an organic acid-based electrolytic solution, and both flame retardancy and characteristics can be improved.
実施例 本発明の実施例と従来例とを表１及び表２に示す。Examples Examples of the present invention and conventional examples are shown in Tables 1 and 2.
従来例１〜７及び本発明の実施例１〜８の特性を表３に
示す 表３において、消火時間の欄の「−」表示は自己消火性
を有していないことを示す。又着火回数10回以上のもの
は「着火せず」と認定し、消火時間は記載していない。 Table 3 shows the characteristics of Conventional Examples 1 to 7 and Examples 1 to 8 of the present invention. In Table 3, "-" in the column of fire extinguishing time indicates that it does not have self-extinguishing property. If the number of ignitions is 10 or more, it is certified as "not ignited" and the extinguishing time is not stated.
着火の試験方法は５秒間ガスバーナの火焔をコンデンサ
素子にあてて着火を行ない、３秒間火を離す作業を繰り
返して着火回数を調べる。３秒間以内で消火した場合は
「着火せず」と判定した。Regarding the ignition test method, the flame of a gas burner is applied to the capacitor element for 5 seconds to perform ignition, and the operation of releasing the fire for 3 seconds is repeated to check the number of times of ignition. When the fire was extinguished within 3 seconds, it was judged as "no ignition".
表３によると、従来例に対し本発明実施例のものは、着
火回数は増え、自己消火性を示すような傾向を示す。ま
た、特性については従来のポリビニールアルコールに劣
ることはなく、硼酸を主溶質とする電解液では、難燃性
向上、火花電圧向上を勘案して硼酸量を減少させること
により特性の改善に寄与することができるようになっ
た。According to Table 3, in the example of the present invention, the number of ignition increases and the self-extinguishing property tends to be exhibited in comparison with the conventional example. In addition, the characteristics are not inferior to conventional polyvinyl alcohol, and in the electrolyte solution containing boric acid as the main solute, it contributes to the improvement of characteristics by reducing the amount of boric acid in consideration of flame retardancy improvement and spark voltage improvement. I was able to do it.
発明の効果 従来は、電解液の難燃化をすすめるためには、硼酸を多
量に溶解することによって行ってきたが、本発明はケイ
素含有ポリビニールアルコールが効果があることがわか
り、これを用いることにより、初めて特性に悪影響を及
ぼすことなく有機酸を主溶質とする電解液での難燃化を
実現することができた。また従来より硼酸量の大幅に低
減することができ、特性改善に大いに効果を示した。EFFECTS OF THE INVENTION Conventionally, in order to promote flame retardancy of an electrolytic solution, a large amount of boric acid was dissolved, but the present invention has found that silicon-containing polyvinyl alcohol is effective and uses it. As a result, for the first time, it was possible to achieve flame retardancy with an electrolytic solution containing an organic acid as a main solute without adversely affecting the characteristics. In addition, the amount of boric acid can be greatly reduced compared to the conventional method, and it has been greatly effective in improving the characteristics.
特に、安全性が要求されている高圧用電解液として優れ
た特性を示す電解液をうることができたもので、産業の
発達に寄与すること大なる発明である。In particular, it was possible to obtain an electrolytic solution exhibiting excellent characteristics as a high-voltage electrolytic solution that requires safety, and it is a great invention that contributes to the development of industry.
Claims (1)
い、この電解液にケイ素含有ポリビニールアルコールと
硼酸又はこの塩を溶解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, which comprises using an electrolytic solution containing polyhydric alcohol as a main component, and dissolving silicon-containing polyvinyl alcohol and boric acid or a salt thereof in the electrolytic solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30019488A JPH0719730B2 (en) | 1988-11-28 | 1988-11-28 | Electrolytic solution for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30019488A JPH0719730B2 (en) | 1988-11-28 | 1988-11-28 | Electrolytic solution for electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02146717A JPH02146717A (en) | 1990-06-05 |
| JPH0719730B2 true JPH0719730B2 (en) | 1995-03-06 |
Family
ID=17881868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30019488A Expired - Lifetime JPH0719730B2 (en) | 1988-11-28 | 1988-11-28 | Electrolytic solution for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0719730B2 (en) |
-
1988
- 1988-11-28 JP JP30019488A patent/JPH0719730B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02146717A (en) | 1990-06-05 |
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