JP4576317B2 - Electrolytic solution for driving electrolytic capacitors - Google Patents
Electrolytic solution for driving electrolytic capacitors Download PDFInfo
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- JP4576317B2 JP4576317B2 JP2005307140A JP2005307140A JP4576317B2 JP 4576317 B2 JP4576317 B2 JP 4576317B2 JP 2005307140 A JP2005307140 A JP 2005307140A JP 2005307140 A JP2005307140 A JP 2005307140A JP 4576317 B2 JP4576317 B2 JP 4576317B2
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- 239000003990 capacitor Substances 0.000 title claims abstract description 21
- 239000008151 electrolyte solution Substances 0.000 title claims description 33
- GHOKWGTUZJEAQD-ZETCQYMHSA-N (D)-(+)-Pantothenic acid Chemical compound OCC(C)(C)[C@@H](O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-ZETCQYMHSA-N 0.000 claims abstract description 32
- GHOKWGTUZJEAQD-UHFFFAOYSA-N Chick antidermatitis factor Natural products OCC(C)(C)C(O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229940055726 pantothenic acid Drugs 0.000 claims abstract description 16
- 235000019161 pantothenic acid Nutrition 0.000 claims abstract description 16
- 239000011713 pantothenic acid Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 8
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 8
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 claims description 6
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 6
- 235000011007 phosphoric acid Nutrition 0.000 claims description 5
- 239000005711 Benzoic acid Substances 0.000 claims description 4
- 239000001361 adipic acid Substances 0.000 claims description 4
- 235000011037 adipic acid Nutrition 0.000 claims description 4
- 235000010233 benzoic acid Nutrition 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 claims description 3
- DBQPPCHZHNFTCV-UHFFFAOYSA-N 2-(2-hydroxyethoxy)ethyl dihydrogen phosphate Chemical compound OCCOCCOP(O)(O)=O DBQPPCHZHNFTCV-UHFFFAOYSA-N 0.000 claims description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- KKUKTXOBAWVSHC-UHFFFAOYSA-N Dimethylphosphate Chemical compound COP(O)(=O)OC KKUKTXOBAWVSHC-UHFFFAOYSA-N 0.000 claims description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 3
- UCQFCFPECQILOL-UHFFFAOYSA-N diethyl hydrogen phosphate Chemical compound CCOP(O)(=O)OCC UCQFCFPECQILOL-UHFFFAOYSA-N 0.000 claims description 3
- QVKQJEWZVQFGIY-UHFFFAOYSA-N dipropyl hydrogen phosphate Chemical compound CCCOP(O)(=O)OCCC QVKQJEWZVQFGIY-UHFFFAOYSA-N 0.000 claims description 3
- ZJXZSIYSNXKHEA-UHFFFAOYSA-L ethyl phosphate(2-) Chemical compound CCOP([O-])([O-])=O ZJXZSIYSNXKHEA-UHFFFAOYSA-L 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 239000001530 fumaric acid Substances 0.000 claims description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 3
- 239000011976 maleic acid Substances 0.000 claims description 3
- CAAULPUQFIIOTL-UHFFFAOYSA-N methyl dihydrogen phosphate Chemical compound COP(O)(O)=O CAAULPUQFIIOTL-UHFFFAOYSA-N 0.000 claims description 3
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 3
- 235000019260 propionic acid Nutrition 0.000 claims description 3
- MHZDONKZSXBOGL-UHFFFAOYSA-N propyl dihydrogen phosphate Chemical compound CCCOP(O)(O)=O MHZDONKZSXBOGL-UHFFFAOYSA-N 0.000 claims description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 3
- PCIBVZXUNDZWRL-UHFFFAOYSA-N ethylene glycol monophosphate Chemical compound OCCOP(O)(O)=O PCIBVZXUNDZWRL-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 2
- 239000011888 foil Substances 0.000 abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- JTWHVBNYYWFXSI-UHFFFAOYSA-N 2-nitro-1-phenylethanone Chemical compound [O-][N+](=O)CC(=O)C1=CC=CC=C1 JTWHVBNYYWFXSI-UHFFFAOYSA-N 0.000 description 1
- IQUPABOKLQSFBK-UHFFFAOYSA-N 2-nitrophenol Chemical compound OC1=CC=CC=C1[N+]([O-])=O IQUPABOKLQSFBK-UHFFFAOYSA-N 0.000 description 1
- VYWYYJYRVSBHJQ-UHFFFAOYSA-N 3,5-dinitrobenzoic acid Chemical compound OC(=O)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1 VYWYYJYRVSBHJQ-UHFFFAOYSA-N 0.000 description 1
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 1
- 239000001741 Ammonium adipate Substances 0.000 description 1
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- BNUHAJGCKIQFGE-UHFFFAOYSA-N Nitroanisol Chemical compound COC1=CC=C([N+]([O-])=O)C=C1 BNUHAJGCKIQFGE-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-PHYPRBDBSA-N alpha-D-galactose Chemical compound OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-PHYPRBDBSA-N 0.000 description 1
- 235000019293 ammonium adipate Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 1
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000594 mannitol Substances 0.000 description 1
- 235000010355 mannitol Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002828 nitro derivatives Chemical class 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000000346 sugar Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
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Abstract
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）に関するものである。 The present invention relates to an electrolytic solution for driving an electrolytic capacitor (hereinafter referred to as an electrolytic solution).
アルミニウム電解コンデンサを製造するには、高純度のアルミニウム箔を電気化学的にエッチング処理して表面積を拡大させた後、ホウ酸アンモニウム水溶液、アジピン酸アンモニウム水溶液等の化成液中で化成処理を行い、エッチング箔表面に酸化皮膜を形成して陽極箔を得ている。一方、アルミニウム箔をエッチング処理して陰極箔を得、陰極箔と陽極箔との間にセパレータを挿入し巻回してコンデンサ素子を作製する。このようなコンデンサ素子は、電解液を含浸した後、金属製の筒状ケースに収納される。また、筒状ケースの開口部は、弾性ゴムにより封口され、封口した部位を絞り加工することにより封止される。 In order to manufacture an aluminum electrolytic capacitor, a high-purity aluminum foil is electrochemically etched to increase the surface area, and then subjected to a chemical conversion treatment in a chemical conversion solution such as an aqueous ammonium borate solution or an aqueous ammonium adipate solution. An oxide film is formed on the etching foil surface to obtain an anode foil. On the other hand, the aluminum foil is etched to obtain a cathode foil, and a separator is inserted between the cathode foil and the anode foil and wound to produce a capacitor element. Such a capacitor element is impregnated with an electrolytic solution and then accommodated in a metal cylindrical case. Moreover, the opening part of a cylindrical case is sealed by elastic rubber, and it seals by drawing-processing the sealed site | part.
近年、電子部品のデジタル化が進む中で、電解コンデンサの低損失、低インピーダンス化への要求が高まっており、電解コンデンサに使用する電解液は、高電導度（低比抵抗）化に向けて開発が進められている。従来、低圧用電解液にはエチレングリコールを主溶媒とし、アジピン酸、安息香酸等のアンモニウム塩を溶質とするものが使用されてきたが、近年では、電解液中の水分量を増加させて電解液の比抵抗を低減する方法が提案されている（例えば、特許文献１、２参照）。
しかしながら、電解液中の水の配合量を増加させた場合、電解液中の水とアルミニウム電極箔とが水和反応を起こすため、電解コンデンサの電気特性や寿命を著しく低下させる。このような水和反応は、電解液中の水分量の増加に伴って顕著となるため、水の配合量を高めて電解液の低比抵抗化を図ろうとすると、信頼性を十分に維持することができないという問題点がある。 However, when the amount of water in the electrolytic solution is increased, the water in the electrolytic solution and the aluminum electrode foil cause a hydration reaction, so that the electrical characteristics and life of the electrolytic capacitor are significantly reduced. Such a hydration reaction becomes more significant as the amount of water in the electrolytic solution increases. Therefore, if the amount of water is increased to reduce the specific resistance of the electrolytic solution, the reliability is sufficiently maintained. There is a problem that can not be.
以上の問題に鑑みて、本発明の課題は、水を配合して低比抵抗化を図った場合でも、アルミニウム電極箔の水和反応を抑えることにより、高い信頼性を得ることができる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 capable of obtaining high reliability by suppressing the hydration reaction of the aluminum electrode foil even when water is mixed to reduce the specific resistance. Is to provide.
本発明は上記課題を解決するため、種々検討した結果到達し得た発明であり、パントテン酸を電解液に利用しようとするものである。すなわち、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配合した溶媒に、少なくとも、有機カルボン酸またはその塩と、以下の化学式で示されるパントテン酸とを配合したことを特徴とする。 The present invention is an invention that has been achieved as a result of various studies in order to solve the above-described problems, and intends to utilize pantothenic acid in an electrolytic solution. That is, in the electrolytic solution for driving an electrolytic capacitor according to the present invention, at least an organic carboxylic acid or a salt thereof and pantothenic acid represented by the following chemical formula are blended in a solvent in which ethylene glycol and water are blended. Features.
本発明は、水の配合量を電解液全体に対して３０〜７０ｗｔ％とした電解液に適用することができる。 The present invention can be applied to an electrolytic solution in which the amount of water is 30 to 70 wt% with respect to the entire electrolytic solution.
本発明において、パントテン酸の配合量は、電解液全体に対して０．１〜５．０ｗｔ％であることが好ましい。 In this invention, it is preferable that the compounding quantity of pantothenic acid is 0.1-5.0 wt% with respect to the whole electrolyte solution.
本発明において、前記有機カルボン酸は、例えば、ギ酸、酢酸、プロピオン酸、安息香酸、コハク酸、グルタル酸、アジピン酸、フマル酸、マレイン酸、フタル酸、アゼライン酸、クエン酸のうちの少なくとも１種である。 In the present invention, the organic carboxylic acid is, for example, at least one of formic acid, acetic acid, propionic acid, benzoic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, maleic acid, phthalic acid, azelaic acid, and citric acid. It is a seed.
本発明においては、さらに、電解液がオルトリン酸、亜リン酸、および次亜リン酸のうちの少なくとも１種を含むことが好ましい。また、電解液がリン酸モノメチル、リン酸ジメチル、リン酸モノエチル、リン酸ジエチル、リン酸モノプロピル、リン酸ジプロピル、リン酸モノエチレングリコール、またはリン酸ジエチレングリコールのうちの少なくとも１種を含むことが好ましい。 In the present invention, it is preferable that the electrolytic solution further contains at least one of orthophosphoric acid, phosphorous acid, and hypophosphorous acid. The electrolytic solution may contain at least one of monomethyl phosphate, dimethyl phosphate, monoethyl phosphate, diethyl phosphate, monopropyl phosphate, dipropyl phosphate, monoethylene glycol phosphate, or diethylene glycol phosphate. preferable.
また、本発明に係る電解液には、漏れ電流の低減、耐電圧向上、ガス吸収等の目的でコンデンサの駆動用電解液として一般的に使用される種々の添加剤を加えることができる。添加剤の例として、グルコース、フルクトース、マンニトール、キシロース、ガラクトースなどの糖類、ポリビニルアルコール、ポリエチレングリコール、ポリプロピレングリコールなどの高分子化合物、ニトロフェノール、ニトロアセトフェノン、ニトロアニソール、ジニトロ安息香酸等のニトロ化合物等が挙げられる。 In addition, various additives that are generally used as a driving electrolyte for capacitors can be added to the electrolytic solution according to the present invention for the purpose of reducing leakage current, improving withstand voltage, and absorbing gas. Examples of additives include sugars such as glucose, fructose, mannitol, xylose, galactose, polymer compounds such as polyvinyl alcohol, polyethylene glycol, polypropylene glycol, nitro compounds such as nitrophenol, nitroacetophenone, nitroanisole, and dinitrobenzoic acid. Is mentioned.
本発明に係る電解液に配合したパントテン酸は、アルミニウム電極箔との親和性が高いため、電極箔表面に吸着して電極箔と水とが水和反応を起こすのを抑制する。従って、アルミニウム電極箔が水分によって劣化するのを防止できるので、電解コンデンサの電気特性の劣化や寿命低下を抑制することができ、信頼性の向上を図ることができる。 Since pantothenic acid blended in the electrolytic solution according to the present invention has high affinity with the aluminum electrode foil, the pantothenic acid is adsorbed on the surface of the electrode foil and suppresses the hydration reaction between the electrode foil and water. Therefore, since the aluminum electrode foil can be prevented from being deteriorated by moisture, it is possible to suppress the deterioration of the electrical characteristics and the life of the electrolytic capacitor and to improve the reliability.
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。その結果を表１に示す。 Hereinafter, based on an Example, this invention is demonstrated more concretely. First, an electrolytic solution was prepared with the composition shown in Table 1, and the specific resistance at 30 ° C. was measured. The results are shown in Table 1.
次に、表１に示す電解液を使用して、定格６．３Ｖ−１５００μＦ（φ１０×１２．５ｍｍＬ）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測定後、高温負荷試験（１０５℃、定格電圧３０００時間印加）を行い、表２の結果を得た。 Next, 10 electrolytic capacitors each having a rating of 6.3 V-1500 μF (φ10 × 12.5 mmL) were prepared using the electrolyte shown in Table 1, and after initial characteristics measurement of tan δ and leakage current, high temperature load test (Applied at 105 ° C. and a rated voltage of 3000 hours) and the results shown in Table 2 were obtained.
表２において、水分の配合量が等しいもの同士、すなわち、水分量５０ｗｔ％の従来例２と実施例２〜５を比較すると、パントテン酸を添加した場合、高温負荷試験においてｔａｎδ、漏れ電流の増大および弁膨張等が抑制され、優れた特性を示している。 In Table 2, when the blending amounts of water are equal, that is, when Comparative Example 2 having a water content of 50 wt% and Examples 2 to 5 are compared, when pantothenic acid is added, tan δ and leakage current increase in a high-temperature load test Further, valve expansion and the like are suppressed, and excellent characteristics are shown.
ここで、パントテン酸の配合量は、電解液全体に対して０．１ｗｔ％未満（実施例１）、または５．０ｗｔ％を超える（実施例６）と、弁膨張を抑制する効果が十分でない。よって、パントテン酸の配合量は０．１〜５．０ｗｔ％の範囲が好ましい。また、水分の配合量は、電解液全体に対して３０ｗｔ％未満では比抵抗が高く（実施例１０）、配合量が７０ｗｔ％を超えると、低比抵抗化は実現するものの、パントテン酸の効果が低下することが分かる（実施例１１）。よって、水分の配合量は３０〜７０ｗｔ％が好ましい。 Here, when the compounding amount of pantothenic acid is less than 0.1 wt% (Example 1) or more than 5.0 wt% (Example 6) with respect to the entire electrolyte solution, the effect of suppressing valve expansion is not sufficient. . Therefore, the blending amount of pantothenic acid is preferably in the range of 0.1 to 5.0 wt%. In addition, the specific amount of moisture is less than 30 wt% with respect to the whole electrolyte solution (Example 10). When the added amount exceeds 70 wt%, the specific resistance is reduced, but the effect of pantothenic acid is achieved. (Example 11). Therefore, the blending amount of moisture is preferably 30 to 70 wt%.
また、上記実施例の他、ギ酸、酢酸、プロピオン酸、安息香酸、コハク酸、グルタル酸、アジピン酸、フマル酸、マレイン酸、フタル酸、アゼライン酸、クエン酸、またはそれらの塩を濃度を変えて配合した電解液でも、パントテン酸によって、電気特性の劣化や寿命低下を抑制できる結果が得られた。
また、電解液に対して、他のリン酸類として、亜リン酸、次亜リン酸、リン酸モノメチル、リン酸ジメチル、リン酸モノエチル、リン酸ジエチル、リン酸モノプロピル、リン酸ジプロピル、リン酸モノエチレングリコール、リン酸ジエチレングリコールを配合した場合でも、パントテン酸と組合わせることで、高温負荷試験におけるｔａｎδ、漏れ電流の増大および弁膨脹を抑制できる効果が得られた。
In addition to the above examples, the concentrations of formic acid, acetic acid, propionic acid, benzoic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, maleic acid, phthalic acid, azelaic acid, citric acid, or salts thereof are changed. Even with the electrolytic solution blended in this way, it was possible to suppress the deterioration of electrical characteristics and the decrease in life by pantothenic acid.
In addition, phosphoric acid, hypophosphorous acid, monomethyl phosphate, dimethyl phosphate, monoethyl phosphate, diethyl phosphate, monopropyl phosphate, dipropyl phosphate, phosphoric acid as other phosphoric acids for the electrolyte Even when monoethylene glycol and diethylene glycol phosphate were blended, by combining with pantothenic acid, an effect of suppressing tan δ, increase in leakage current and valve expansion in a high temperature load test was obtained.
なお、本発明は上記実施例に限定されるものではなく、先に例示した各種溶質を単独または複数溶解した電解液や、さらに、電解コンデンサの駆動用電解液に使用される一般的な添加剤を加えた電解液についても上記実施例と同等の効果があった。 In addition, this invention is not limited to the said Example, The general additive used for the electrolyte solution which melt | dissolved the various solutes illustrated previously individually or more than one, and also for the electrolytic solution for driving an electrolytic capacitor The electrolyte solution to which was added also had the same effect as the above example.
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