JP2007081138A - Electrolyte for driving electrolytic capacitor - Google Patents

Electrolyte for driving electrolytic capacitor Download PDF

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JP2007081138A
JP2007081138A JP2005267148A JP2005267148A JP2007081138A JP 2007081138 A JP2007081138 A JP 2007081138A JP 2005267148 A JP2005267148 A JP 2005267148A JP 2005267148 A JP2005267148 A JP 2005267148A JP 2007081138 A JP2007081138 A JP 2007081138A
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electrolyte
electrolytic capacitor
water
hinokitiol
electrolytic solution
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JP4668749B2 (en
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Kunio Tsuji
邦夫 辻
Akihiro Matsuda
晃啓 松田
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Nichicon Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolyte capable of composing a reliable electrolytic capacitor under a high-temperature condition even if resistance is decreased by adding water. <P>SOLUTION: Hinokitiol shown by a chemical expression is blended to the electrolyte where at least a high-class dibasic acid or its salt is blended to a solvent in which ethyleneglycol and water are mixed. The hinokitiol suppresses hydration reaction between electrode foil under a high temperature and water in the electrolyte, thus suppressing an increase in leaked current in the electrolytic capacitor without any loads at a high temperature even if the resistance is decreased by adding water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電解コンデンサの駆動用電解液(以下、電解液と称す)の改良に関するものである。   The present invention relates to an improvement in an electrolytic solution for driving an electrolytic capacitor (hereinafter referred to as an electrolytic solution).

近年の電解コンデンサの小型化に伴い、電解コンデンサの陽極箔にはエッチング倍率の高いものが使用されるようになったため、比抵抗の低い電解液が要求されている。従来、中高圧用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を主溶媒とし、高級二塩基酸またはそのアンモニウム塩とホウ酸またはそのアンモニウム塩を溶解し、電解液の耐電圧を上昇させるため、マンニトール、ソルビトール等の多価アルコールを添加した電解液が提案されている(例えば、特許文献1〜3参照)。
特公平7−48459号公報(第1−4頁) 特公平7−48460号公報(第1−3頁) 特公平7−63047号公報(第1−4頁)
Along with the recent miniaturization of electrolytic capacitors, the anode foil of electrolytic capacitors has come to be used with a high etching magnification, so that an electrolytic solution having a low specific resistance is required. Conventionally, as an electrolytic solution of an aluminum electrolytic capacitor for medium to high pressure, ethylene glycol is used as a main solvent, a higher dibasic acid or its ammonium salt and boric acid or its ammonium salt are dissolved, and the withstand voltage of the electrolytic solution is increased. An electrolytic solution to which a polyhydric alcohol such as mannitol or sorbitol is added has been proposed (for example, see Patent Documents 1 to 3).
Japanese Examined Patent Publication No. 7-48459 (page 1-4) Japanese Patent Publication No. 7-48460 (page 1-3) Japanese Examined Patent Publication No. 7-63047 (page 1-4)

上記電解液で低比抵抗のものを得るには、電解質の濃度を高くするか、水を多量に添加しなければならない。しかしながら、電解質の濃度の増加は電解質の析出、耐電圧低下を起こす。また、水を多量に添加した場合、電解コンデンサの高温無負荷時の漏れ電流を増加させるため、105℃での使用は困難である。   To obtain a low specific resistance electrolyte solution, the electrolyte concentration must be increased or a large amount of water must be added. However, an increase in the electrolyte concentration causes electrolyte deposition and a decrease in withstand voltage. In addition, when a large amount of water is added, the leakage current at high temperature and no load of the electrolytic capacitor is increased, so that it is difficult to use at 105 ° C.

以上の問題点に鑑みて、本発明の課題は、水の添加により低比抵抗化を図った場合でも、高温条件下での信頼性が高い電解コンデンサを構成可能な電解液を提供することにある。   In view of the above problems, an object of the present invention is to provide an electrolytic solution that can constitute an electrolytic capacitor having high reliability under high temperature conditions even when the specific resistance is reduced by adding water. is there.

上記課題を解決するために、本発明に係る電解コンデンサの駆動用電解液では、エチレングリコールと水とを混合した溶媒に、少なくとも、有機カルボン酸あるいはその塩と、以下の化学式で示されるヒノキチオールとを配合したことを特徴とする。   In order to solve the above problems, in the electrolytic solution for driving an electrolytic capacitor according to the present invention, a solvent obtained by mixing ethylene glycol and water, at least an organic carboxylic acid or a salt thereof, and a hinokitiol represented by the following chemical formula: It is characterized by blending.

Figure 2007081138
Figure 2007081138

本発明において、ヒノキチオールの配合量は、例えば、電解液全体に対して0.1〜1.0wt%であることが好ましい。   In this invention, it is preferable that the compounding quantity of hinokitiol is 0.1-1.0 wt% with respect to the whole electrolyte solution, for example.

本発明において、電解液を中高圧用として構成する場合、前記有機カルボン酸としては、高級二塩基酸が用いられる。また、水の混合量は、電解液全体に対して2.0〜10.0wt%であることが好ましい。   In the present invention, when the electrolytic solution is configured for medium to high pressure, a higher dibasic acid is used as the organic carboxylic acid. Moreover, it is preferable that the mixing amount of water is 2.0-10.0 wt% with respect to the whole electrolyte solution.

上記高級二塩基酸としては、アゼライン酸、セバシン酸、1,6−デカンジカルボン酸、5,6−デカンジカルボン酸、7−ビニルヘキサデセン−1,16−ジカルボン酸等を例示することができる。   Examples of the higher dibasic acid include azelaic acid, sebacic acid, 1,6-decanedicarboxylic acid, 5,6-decanedicarboxylic acid, 7-vinylhexadecene-1,16-dicarboxylic acid and the like.

高級二塩基酸の塩としては、アンモニウム塩の他、メチルアミン、エチルアミン、t−ブチルアミン等の一級アミン塩、ジメチルアミン、エチルメチルアミン、ジエチルアミン等の二級アミン塩、トリメチルアミン、ジエチルメチルアミン、エチルジメチルアミン、トリエチルアミン等の三級アミン塩、テトラメチルアンモニウム、トリエチルメチルアンモニウム等の四級アンモニウム塩等を例示することができる。   As salts of higher dibasic acids, in addition to ammonium salts, primary amine salts such as methylamine, ethylamine, t-butylamine, secondary amine salts such as dimethylamine, ethylmethylamine, diethylamine, trimethylamine, diethylmethylamine, ethyl Examples thereof include tertiary amine salts such as dimethylamine and triethylamine, and quaternary ammonium salts such as tetramethylammonium and triethylmethylammonium.

本発明では、電解液にヒノキチオールを配合したため、高温下での電極箔と水との水和反応を抑制することができる。従って、水の添加により低比抵抗化を図った場合でも、高温無負荷での漏れ電流の増大を抑えることができるなど、高温条件下での高い信頼性を得ることができる。また、低比抵抗化を図るにあたって、電解質の増量を必要としないので、耐電圧を低下させることもない。   In this invention, since hinokitiol was mix | blended with electrolyte solution, the hydration reaction of the electrode foil and water under high temperature can be suppressed. Therefore, even when the specific resistance is reduced by adding water, it is possible to obtain high reliability under high temperature conditions, such as suppressing increase in leakage current at high temperature and no load. In addition, in order to reduce the specific resistance, it is not necessary to increase the amount of electrolyte, so that the withstand voltage is not lowered.

以下、実施例に基づいて、本発明をより具体的に説明する。まず、表1、2に示す組成で電解液を調合し、30℃における比抵抗を測定した。   Hereinafter, based on an Example, this invention is demonstrated more concretely. First, an electrolyte solution was prepared with the compositions shown in Tables 1 and 2, and the specific resistance at 30 ° C. was measured.

Figure 2007081138
Figure 2007081138

Figure 2007081138
Figure 2007081138

次に、表1、2の電解液を使用して、定格400V−22μF(φ16×25mmL)の電解コンデンサを各10個作製し、tanδ、漏れ電流について初期特性を測定した後、高温無負荷試験(105℃、3000時間放置)を行い、表3に示す結果を得た。   Next, 10 electrolytic capacitors each rated 400V-22μF (φ16 × 25mmL) were prepared using the electrolytes shown in Tables 1 and 2, and initial characteristics were measured for tan δ and leakage current. (Standing at 105 ° C. for 3000 hours) was performed, and the results shown in Table 3 were obtained.

Figure 2007081138
Figure 2007081138

表3より明らかなように、ヒノキチオールを添加しなかった従来例1〜3と比較し、本発明の実施例1〜12に係る電解液を用いた電解コンデンサは、高温無負荷試験において、漏れ電流の増大が抑制され、優れた特性を示している。   As is apparent from Table 3, compared with the conventional examples 1 to 3 in which hinokitiol was not added, the electrolytic capacitors using the electrolytic solutions according to the examples 1 to 12 of the present invention had a leakage current in a high temperature no-load test. Increase is suppressed, and excellent characteristics are exhibited.

ここで、ヒノキチオールの添加量は、0.1〜1.0wt%の範囲が好ましく、0.1wt%未満(実施例2)では、水の配合量が多い場合に高温無負荷試験における漏れ電流増大の抑制効果が得られず、1.0wt%を超えると(実施例7)、比抵抗が高くなり、低比抵抗用途に不向きとなる。また、水の添加量は、2.0〜10.0wt%の範囲が好ましく、2.0wt%未満(実施例8)では比抵抗がやや高いので、低比抵抗用途に不向きであり、10.0wt%を超える(実施例9)と、ヒノキチオールの効果が低下する。   Here, the addition amount of hinokitiol is preferably in the range of 0.1 to 1.0 wt%, and if it is less than 0.1 wt% (Example 2), the leakage current increases in the high temperature no-load test when the amount of water is large. When the amount exceeds 1.0 wt% (Example 7), the specific resistance increases, making it unsuitable for low specific resistance applications. Further, the amount of water added is preferably in the range of 2.0 to 10.0 wt%, and if it is less than 2.0 wt% (Example 8), the specific resistance is slightly high, so it is not suitable for low specific resistance applications. When it exceeds 0 wt% (Example 9), the effect of hinokitiol decreases.

なお、ヒノキチオールを配合した効果は、上記の実施例に限定されるものではなく、先に記載した各種化合物を単独または複数溶解した電解液に用いても実施例と同等の効果があった。また、エチレングリコールと水と混合した溶媒にアジピン酸アンモニウムなどの有機カルボン酸塩を配合した低圧用の電解液においても、本発明を適用すれば、水の添加により低比抵抗化を図った場合でも、高温条件下での信頼性の高い電解コンデンサを実現できる。   In addition, the effect which mix | blended hinokitiol is not limited to said Example, Even if it used it for the electrolyte solution which melt | dissolved the various compounds described previously individually or in multiple, there existed an effect equivalent to an Example. In addition, in the case of an electrolyte for low pressure in which an organic carboxylate such as ammonium adipate is mixed in a solvent mixed with ethylene glycol and water, if the present invention is applied, the specific resistance can be reduced by adding water. However, a highly reliable electrolytic capacitor can be realized under high temperature conditions.

Claims (4)

エチレングリコールと水とを混合した溶媒に、少なくとも、有機カルボン酸あるいはその塩と、以下の化学式で示されるヒノキチオールとを配合したことを特徴とする電解コンデンサの駆動用電解液。
Figure 2007081138
An electrolytic solution for driving an electrolytic capacitor, wherein an organic carboxylic acid or a salt thereof and hinokitiol represented by the following chemical formula are blended in a solvent obtained by mixing ethylene glycol and water.
Figure 2007081138
請求項1において、ヒノキチオールの配合量が、電解液全体に対して0.1〜1.0wt%であることを特徴とする電解コンデンサの駆動用電解液。   The electrolytic solution for driving an electrolytic capacitor according to claim 1, wherein the amount of hinokitiol is 0.1 to 1.0 wt% with respect to the entire electrolytic solution. 請求項1または2において、前記有機カルボン酸は、高級二塩基酸であることを特徴とする電解コンデンサの駆動用電解液。   3. The electrolytic solution for driving an electrolytic capacitor according to claim 1, wherein the organic carboxylic acid is a higher dibasic acid. 請求項3において、水の混合量が電解液全体に対して2.0〜10.0wt%であることを特徴とする電解コンデンサの駆動用電解液。   4. The electrolytic solution for driving an electrolytic capacitor according to claim 3, wherein the amount of water mixed is 2.0 to 10.0 wt% with respect to the entire electrolytic solution.
JP2005267148A 2005-09-14 2005-09-14 Electrolytic solution for electrolytic capacitor drive Expired - Fee Related JP4668749B2 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04330708A (en) * 1990-11-29 1992-11-18 Nichicon Corp Electrolytic solution for driving electrolytic capacitor
JPH09241133A (en) * 1996-03-04 1997-09-16 Pola Chem Ind Inc Hair-growing agent
JP2001288008A (en) * 2000-04-03 2001-10-16 Asahi Kasei Corp Formulation containing hinokitiol
JP2002075794A (en) * 2000-08-31 2002-03-15 Nichicon Corp Electrolyte for driving aluminum electrolytic capacitor
JP2002083741A (en) * 2000-09-08 2002-03-22 Nichicon Corp Electrolysis solution for driving electrolytic capacitor
JP2004186189A (en) * 2002-11-29 2004-07-02 Nichicon Corp Electrolyte for driving electrolytic capacitor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04330708A (en) * 1990-11-29 1992-11-18 Nichicon Corp Electrolytic solution for driving electrolytic capacitor
JPH09241133A (en) * 1996-03-04 1997-09-16 Pola Chem Ind Inc Hair-growing agent
JP2001288008A (en) * 2000-04-03 2001-10-16 Asahi Kasei Corp Formulation containing hinokitiol
JP2002075794A (en) * 2000-08-31 2002-03-15 Nichicon Corp Electrolyte for driving aluminum electrolytic capacitor
JP2002083741A (en) * 2000-09-08 2002-03-22 Nichicon Corp Electrolysis solution for driving electrolytic capacitor
JP2004186189A (en) * 2002-11-29 2004-07-02 Nichicon Corp Electrolyte for driving electrolytic capacitor

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