KR100259001B1 - An electrolyte for al electrolytic condenser - Google Patents
An electrolyte for al electrolytic condenser Download PDFInfo
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- KR100259001B1 KR100259001B1 KR1019980010078A KR19980010078A KR100259001B1 KR 100259001 B1 KR100259001 B1 KR 100259001B1 KR 1019980010078 A KR1019980010078 A KR 1019980010078A KR 19980010078 A KR19980010078 A KR 19980010078A KR 100259001 B1 KR100259001 B1 KR 100259001B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
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- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
본 발명은 알루미늄 전해콘덴서용 전해액에 관한 것으로, 특히 전해액의 전도도를 향상시키며 전해 콘덴서의 손실값(tanδ)을 일정수준이하로 낮추고 저온 및 고온에서 안정된 제품특성을 가지고 있는 알루미늄 전해콘덴서용 전해액에 관한 것이다.The present invention relates to an electrolytic solution for an aluminum electrolytic capacitor, and more particularly, to an electrolytic solution for an aluminum electrolytic capacitor which improves conductivity of an electrolytic solution, lowers a loss value (tanδ) of an electrolytic capacitor to a predetermined level, and has stable product characteristics at low and high temperatures. will be.
일반적으로 알루미늄 전해콘덴서는 전극으로 알루미늄 박판을 사용하고, 전해질로서 암모늄에 염류와 쌍극성 유기용매에 용해된 유기산으로 구성되어 있는 액체 전해질을 사용하여 단위면적당 정전용량이 높아 부품의 소형, 고용량화에 적합한 콘덴서이다.In general, aluminum electrolytic capacitors use aluminum thin plates as electrodes, and liquid electrolytes composed of salts in ammonium and organic acids dissolved in bipolar organic solvents as electrolytes, and have high capacitance per unit area. It is a capacitor.
상기한 콘덴서중 고압용 콘덴서에 사용되는 전해액은 에틸렌 글리콜을 주체로한 용매에 아제라인산(Azelaic acid)또는 세바틴산(Sebatic acid)과 같은 고급의 직쇄 이염기성산 또는 상기한 산의 암모늄염을 용질로하고 전해콘덴서의 수명특성을 개선하기 위해 파라니트로페놀(p-nitrophenol)과 같은 니트로 화합물을 첨가하여 구성하였다.Among the condensers, the electrolytic solution used for the high pressure condenser is composed of a high-quality straight-chain dibasic acid such as azelaic acid or sebatic acid or an ammonium salt of the above acid in a solvent mainly composed of ethylene glycol. In order to improve the life characteristics of the electrolytic capacitor, it was composed by adding a nitro compound such as paranitrophenol (p-nitrophenol).
이에 비해서 저압용 콘덴서에 사용되는 전해액은 에틸렌 글리콜(EG)과 물(H2O)로 된 혼합용매에 카르본 산의 암모늄염을 용질로 하고 있는 조성을 하고 있다.On the other hand, the electrolyte solution used for the low pressure capacitor has a composition in which ammonium salt of carboxylic acid is used as a solute in a mixed solvent of ethylene glycol (EG) and water (H 2 O).
그러나 이러한 조성을 가지는 종래의 저압용 전해액은 저온에서 점도가 쉽게 상승되면서 콘덴서의 저온특성을 악화시킬 뿐만 아니라, 고온 분위기중에서 부하시험시에 콘덴서의 양극산화 피막 및 음극막이 등 알루미늄 전극이 전해액에 포함된 물과 반응하면서 수소가스를 발생시키게 되면서 콘덴서 내의 압력이 증가하게 되어 콘덴서의 안전수단으로 내장된 벤트(Bent)부가 위로 팽창하게 되면서 단자연결부가 단락되어져 콘덴서 작용을 못하게 되는 경우가 빈번하게 발생하는 문제점이 있었다.However, the conventional low pressure electrolyte having such a composition not only deteriorates the low temperature characteristics of the capacitor as the viscosity is easily increased at low temperatures, and also includes an aluminum electrode such as an anodized film and a cathode film of the capacitor during the load test in a high temperature atmosphere. As hydrogen gas is generated while reacting with water, the pressure in the condenser increases, and the vent part embedded as a safety means of the condenser expands upwards, and the terminal connection part is short-circuited to prevent the condenser from working. There was this.
본 발명은 상기한 문제점을 해결하기 위한 것으로, 충분한 내전압을 가지게 되어 하이리플용 전해콘덴서의 소형화가 가능하고, 고온에서의 특성이 안정되어 사용온도범위가 확대되며, 장시간 사용가능하도록 된 알루미늄 전해콘덴서용 전해액을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, has a sufficient withstand voltage, it is possible to miniaturize the electrolytic capacitor for high-ripple, stable at high temperatures, the use temperature range is expanded, and the aluminum electrolytic capacitor is to be used for a long time The purpose is to provide a solvent solution.
상기의 목적을 달성하기 위한 알루미늄 전해콘덴서용 전해액은, 감마부틸락톤 60∼65 중량%, 에틸렌 글리콜 6∼8 중량%, 프탈산 10 중량%, 트리에틸아민 10∼17 중량%, 파라니트로 벤조인산 1 중량%, 방향족 니트로화합물 0.5∼1.0 중량%, 붕산 2%, 솔비톨 3%로 이루어진 것을 특징으로 한다.The electrolytic solution for aluminum electrolytic capacitors for achieving the above object is 60 to 65% by weight of gamma butyl lactone, 6 to 8% by weight of ethylene glycol, 10% by weight of phthalic acid, 10 to 17% by weight of triethylamine, paranitro benzoic acid 1 Wt%, aromatic nitro compound 0.5-1.0 wt%, boric acid 2%, sorbitol is characterized in that 3%.
상기한 조성의 전해액을 콘덴서에 적용시킨 결과, -55℃의 저온에서 전기적 특성이 우수할 뿐아니라 105℃의 고온에서의 부하 수명시험특성도 개선되는 효과가 있었다.As a result of applying the electrolytic solution having the above composition to the capacitor, not only the electrical characteristics were excellent at low temperatures of -55 ° C., but also the load life test characteristics at high temperatures of 105 ° C. were improved.
본 발명을 상세히 설명하면 다음과 같다.The present invention is described in detail as follows.
본 발명의 알루미늄 전해콘덴서용 전해액은, 감마부틸락톤 60∼65 중량%, 에틸렌 글리콜 6∼8 중량%, 프탈산 10 중량%, 트리에틸아민 10∼17 중량%, 파라니트로 벤조인산 1 중량%, 방향족 니트로 화합물 0.5∼1.0 중량%, 붕산 2 중량%, 솔비톨 3 중량%로 이루어진 것이다.The electrolyte solution for aluminum electrolytic capacitors of the present invention is 60 to 65% by weight of gamma butyl lactone, 6 to 8% by weight of ethylene glycol, 10% by weight of phthalic acid, 10 to 17% by weight of triethylamine, 1% by weight of paranitrobenzoic acid, aromatic Nitro compound 0.5 to 1.0% by weight, boric acid 2% by weight, sorbitol 3% by weight.
여기서 상기 감마부틸락톤을 주용매로 사용한 것은 에틸렌 글리콜 보다 응고점이 낮기 때문이다.The reason why the gamma butyl lactone is used as the main solvent is that the coagulation point is lower than that of ethylene glycol.
그리고 전해액의 PH가 3.5 미만 7 이상이면 고온수명특성이 저하하기 때문에 전해액의 PH를 3.5∼7 범위내로 유지하기 위하여 트리에틸아민을 첨가하도록 된 것이다.When the pH of the electrolyte is less than 3.5 and 7 or more, the high temperature life characteristic is lowered, so that triethylamine is added to maintain the pH of the electrolyte within the range of 3.5-7.
또한, 전해액의 사용내전압을 향상시키기 위해서는 붕산 1.0∼5.0 중량%, 다가알코올인 솔비톨을 3.0∼8.0 중량%를 첨가하는 것이 바람직하다.Moreover, in order to improve the breakdown voltage of electrolyte solution, it is preferable to add 1.0-5.0 weight% of boric acid and 3.0-8.0 weight% of sorbitol which is a polyhydric alcohol.
다음에서 본발명에 따른 실시예 1의 전해액은 감마부틸락톤 62 중량%, 에틸렌 글리콜 8.0 중량%, 프탈산 10.0 중량%, 트리에틸아민 14 중량%, 파라니트로벤조인산 1 중량%, 붕산 2.0 중량%, 솔비톨 3 중량%의 조성으로 구성하였다.Next, the electrolyte solution of Example 1 according to the present invention is 62% by weight of gamma butyllactone, 8.0% by weight of ethylene glycol, 10.0% by weight of phthalic acid, 14% by weight of triethylamine, 1% by weight of paranitrobenzoic acid, 2.0% by weight of boric acid, Sorbitol consisted of 3% by weight of composition.
그리고 비교되는 종래의 전해액은, 에틸렌 글리콜 62 중량%, 물(H2O) 16 중량%, 암모늄아디페이트 12 중량%의 조성으로 구성하였다.And a conventional electrolyte to be compared, 62% by weight of ethylene glycol, water (H 2 O) 16% by weight, and consists of a composition of 12 wt% ammonium adipate.
그리하여 상기한 본 발명예와 종래예를 각각 25℃의 측정온도에서 TOA사 제품의 CM-8ET 전도도계를 사용하여 전도도를 측정하고, 내전압은 시료 1㎠당 1mA를 인가하여 측정한 결과를 다음 표 1에 나타내었다.Thus, the above-described examples of the present invention and the prior art were measured using a CM-8ET conductivity meter manufactured by TOA at a measurement temperature of 25 ° C., respectively, and the withstand voltage was measured by applying 1 mA per 1 cm 2 of the sample. 1 is shown.
상기 표 1에서 본 발명의 물리적 특성은 전도도 6.0mS/cm, 내전압 110V를 나타내었고, 종래예의 물리적특성은 전도도 5.6mS/cm, 내전압 120V를 나타내었다.In Table 1, the physical properties of the present invention showed a conductivity of 6.0mS / cm, withstand voltage 110V, and the physical properties of the conventional example showed a conductivity of 5.6mS / cm and a breakdown voltage of 120V.
또한, 본 발명예와 종래예를 각각 용량 63V/100μF의 전해톤덴서 크기 (10Φ×16ℓ)로 제품화하여 전기적 특성의 결과를 표 2에 나타내었다.In addition, Table 2 shows the results of the electrical characteristics of the present invention and the conventional example by commercializing the electrolytic tone capacitor size (10Φ x 16L) with a capacity of 63V / 100μF, respectively.
여기서 CAP의 단위는 μF 이고, tanδ의 단위는 %이며, LC는 μA이고, ΔC는 초기 CAP에 대한 변화율을 표시한다.Where the unit of CAP is μF, the unit of tanδ is%, LC is μA and ΔC represents the rate of change for the initial CAP.
상기한 결과에 따르면 본 발명의 알루미늄 전해콘덴서용 전해액은 종래 전해액에 비하여 -55℃에서 측정한 CAP 및 tanδ를 비교해 볼대 저온에서의 전기적 특성이 향상된 것을 알 수 있다.According to the above results, it can be seen that the electrolytic solution for the aluminum electrolytic capacitor of the present invention has improved electrical characteristics at low temperatures compared to the CAP and tan δ measured at -55 ° C. compared with the conventional electrolyte solution.
더욱이 105℃의 고온부하시험에서의 특성도 종래예에 비해 개선된 것을 알 수 있다.Furthermore, it can be seen that the properties in the high temperature load test at 105 ° C. are also improved compared with the conventional example.
본 발명의 효과는 에틸렌 글리콜 보다 응고점이 낮은 감마부틸락톤을 주용매로 하고, 여기에 에틸렌 글리콜 용매를 혼합시킨 혼합용매에 프탈산과 트리에틸아민으로 전해액의 pH를 3.5∼7범위내로 조성하므로써 전해콘덴서의 저온특성 및 고온수명특성을 개선하게 되는 효과가 있는 것이다.The effect of the present invention is that the electrolytic capacitor is composed of gamma butyl lactone having a lower coagulation point than ethylene glycol as the main solvent, and the pH of the electrolyte is set within the range of 3.5 to 7 with phthalic acid and triethylamine in a mixed solvent in which an ethylene glycol solvent is mixed. It has the effect of improving the low temperature characteristics and high temperature life characteristics of the.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019980010078A KR100259001B1 (en) | 1998-03-24 | 1998-03-24 | An electrolyte for al electrolytic condenser |
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| KR1019980010078A KR100259001B1 (en) | 1998-03-24 | 1998-03-24 | An electrolyte for al electrolytic condenser |
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| KR19990075705A KR19990075705A (en) | 1999-10-15 |
| KR100259001B1 true KR100259001B1 (en) | 2000-06-15 |
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