JPS6258650B2 - - Google Patents
Info
- Publication number
- JPS6258650B2 JPS6258650B2 JP10892982A JP10892982A JPS6258650B2 JP S6258650 B2 JPS6258650 B2 JP S6258650B2 JP 10892982 A JP10892982 A JP 10892982A JP 10892982 A JP10892982 A JP 10892982A JP S6258650 B2 JPS6258650 B2 JP S6258650B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic solution
- capacitor
- added
- corrosion
- boron oxide
- 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
Links
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 27
- 239000003990 capacitor Substances 0.000 claims description 20
- 239000008151 electrolyte solution Substances 0.000 claims description 13
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052810 boron oxide Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 150000003863 ammonium salts Chemical class 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical class OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical class OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 4
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical class OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 claims description 4
- 239000001361 adipic acid Chemical class 0.000 claims description 2
- 235000011037 adipic acid Nutrition 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- 239000003792 electrolyte Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 2
- 239000001741 Ammonium adipate Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000019293 ammonium adipate Nutrition 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Description
本発明はアルミニウム電解コンデンサ駆動用電
解液の改良に関する。
従来、この種電解液として、エチレングリコー
ルを主溶媒とし、これに有機カルボン酸のアンモ
ニウム塩を溶解したものが知られている。
斯る電解液は、コンデンサの低温特性などに於
て秀れた効果をもたらすが、半面、コンデンサの
高温負荷試験中に腐蝕が発生する欠点を有する。
即ち、この腐蝕を、図の典型的アルミニウム電解
コンデンサに於て説明すると、コンデンサは、巻
回素子１、該素子を収納するケース２、該ケース
の開口を封口し、合成樹脂板４及びゴム板５の合
体からなる封口板３、外部端子６、該外部端子と
リード箔７とを接続する内部端子８とから構成さ
れるが、高温負荷試験中に、特にリード箔７や内
部端子８に腐蝕が見られる。腐蝕は充放電やリツ
プル電流を流すことにより加速され、ついにはリ
ード箔７などが腐蝕切断されるに至る。
従つて本発明目的は、エチレングリコールと有
機カルボン酸のアンモニウム塩との組合せになる
電解液に於て、その秀れた特性を損うことなく、
上記腐蝕の発生を防止し得る改良されたアルミニ
ウム電解コンデンサ駆動用電解液を提供するにあ
る。
即ち、本発明電解液は、主溶媒エチレングリコ
ールにイオノーゲンとして有機カルボン酸のアン
モニウム塩を溶解した電解液に酸化ホウ素
（B2O3）を0.5〜10重量％添加したことを特徴とす
るものであり、これにより、特に、ポリプロピレ
ン樹脂を内面とする封口板で封口されたアルミニ
ウム電解コンデンサにおいて、所期の目的が有効
に達せられる。
本発明電解液に於て、酸化ホウ素の添加量が
0.5重量％より少ない場合には腐蝕抑制または防
止効果がほとんど認められず、一方10重量％を越
えると腐蝕防止効果は十分であるものゝ、副作用
として電解液の粘度が高くなり、電導度も低くな
るため、コンデンサの低温特性に於ける容量減少
及び損失の増大を来たし好ましくない。従つてこ
れらの添加量範囲は本発明から除外される。
又、本発明電解液に於て、有機カルボン酸のア
ンモニウム塩としては、アジピン酸、スベリン
酸、セバチン酸などの各アンモニウム塩が好適で
ある。
更に、本発明電解液に於て、溶媒としてのエチ
レングリコールと溶質としての有機カルボン酸の
アンモニウム塩との含有割合は任意であり、通常
斯る溶質は溶解量限度内で使用される。
以下本発明実施例を述べる。
本発明実施例に於て、添加剤である酸化ホウ素
は溶媒に100℃前後で良く溶解し、従つて通常の
手法で溶媒、溶質及び添加剤が混合されて電解液
が作成され、次いでその電解液を用いて既述の図
示せる形態のコンデンサが作成された。以下の試
験は斯るコンデンサによりなされたものである。
尚コンデンサの定格は160V、680μＦであり、又
リツプル負荷試験は、温度85℃、リツプル電流60
Hz、2A、電流印加時間500時間の条件下で行なわ
れた。
The present invention relates to improvements in electrolytes for driving aluminum electrolytic capacitors. Conventionally, as this kind of electrolytic solution, one in which an ammonium salt of an organic carboxylic acid is dissolved in ethylene glycol as a main solvent is known. Although such an electrolyte has excellent effects on the low-temperature characteristics of the capacitor, it has the disadvantage that corrosion occurs during high-temperature load tests of the capacitor.
That is, to explain this corrosion in the case of the typical aluminum electrolytic capacitor shown in the figure, the capacitor consists of a wound element 1, a case 2 that houses the element, an opening of the case sealed, a synthetic resin plate 4, and a rubber plate. 5, an external terminal 6, and an internal terminal 8 that connects the external terminal and the lead foil 7. However, during the high temperature load test, the lead foil 7 and the internal terminal 8 were particularly susceptible to corrosion. can be seen. Corrosion is accelerated by charging and discharging and flowing ripple current, and eventually lead foils 7 and the like are corroded and cut. Therefore, the object of the present invention is to provide an electrolytic solution containing a combination of ethylene glycol and an ammonium salt of an organic carboxylic acid without impairing its excellent properties.
An object of the present invention is to provide an improved electrolytic solution for driving an aluminum electrolytic capacitor that can prevent the occurrence of the above-mentioned corrosion. That is, the electrolytic solution of the present invention is characterized in that 0.5 to 10% by weight of boron oxide (B 2 O 3 ) is added to an electrolytic solution in which an ammonium salt of an organic carboxylic acid as an ionogen is dissolved in ethylene glycol as a main solvent. As a result, the intended purpose can be effectively achieved, particularly in aluminum electrolytic capacitors sealed with a sealing plate whose inner surface is made of polypropylene resin. In the electrolyte of the present invention, the amount of boron oxide added is
If it is less than 0.5% by weight, almost no corrosion suppression or prevention effect is observed, while if it exceeds 10% by weight, the corrosion prevention effect is sufficient, but as a side effect, the viscosity of the electrolyte increases and the conductivity decreases. This results in a decrease in capacity and an increase in loss in the low-temperature characteristics of the capacitor, which is undesirable. Therefore, these addition amount ranges are excluded from the present invention. In the electrolytic solution of the present invention, ammonium salts of organic carboxylic acids such as adipic acid, suberic acid, and sebacic acid are suitable. Further, in the electrolytic solution of the present invention, the content ratio of ethylene glycol as a solvent and ammonium salt of an organic carboxylic acid as a solute is arbitrary, and the solute is usually used within the solubility limit. Examples of the present invention will be described below. In the examples of the present invention, the additive boron oxide dissolves well in the solvent at around 100°C, so the solvent, solute, and additives are mixed in a conventional manner to create an electrolytic solution, and then the electrolyte A capacitor of the form described above and shown in the figures was made using the liquid. The following tests were conducted with such a capacitor.
The capacitor rating is 160V and 680μF, and the ripple load test was conducted at a temperature of 85℃ and a ripple current of 60℃.
The test was carried out under the conditions of Hz, 2A, and current application time of 500 hours.
【表】
第１表に於て、Ｚ／Zoは−25℃に於ける120Hz
でのインピーダンスＺと＋20℃に於ける120Hzで
のインピーダンスZoとの比を表わし、この値が
小さいほど低温性が秀れている。又第１表の試験
に供されたコンデンサの封口板３を構成する合成
樹脂板４（図面参照）はフエノール樹脂からな
る。
第１表から明らかな如く、エチレングリコール
と有機カルボン酸のアンモニウム塩からなる基本
電解液に酸化ホウ素を添加した場合、基本電解液
の秀れた低温特性をほとんど損うことなく有効な
腐蝕防止をなすことができる。
尚、ポリプロピレン樹脂はフエノール樹脂より
も電解液による腐蝕が現われ難く、従つて合成樹
脂板４をポリプロピレン樹脂で形成した場合に
も、当然有効な腐蝕防止効果を得ることができ
る。
斯る酸化ホウ素の添加効果はその添加量によつ
て左右される。第２表に、基本電解液としてエチ
レングリコールとアジピン酸アンモニウムを選ん
だ場合を典型例として添加効果を代表的に示す。[Table] In Table 1, Z/Zo is 120Hz at -25℃
It represents the ratio between the impedance Z at 120Hz and the impedance Zo at 120Hz at +20°C, and the smaller this value, the better the low temperature properties. Furthermore, the synthetic resin plate 4 (see drawing) constituting the sealing plate 3 of the capacitors subjected to the tests shown in Table 1 is made of phenolic resin. As is clear from Table 1, when boron oxide is added to a basic electrolyte consisting of ethylene glycol and an ammonium salt of an organic carboxylic acid, it provides effective corrosion protection without substantially impairing the excellent low-temperature properties of the basic electrolyte. It can be done. Note that polypropylene resin is less susceptible to corrosion by electrolyte than phenolic resin, and therefore, even when the synthetic resin plate 4 is formed of polypropylene resin, an effective corrosion prevention effect can naturally be obtained. The effect of adding boron oxide depends on the amount added. Table 2 shows the effects of addition in a typical case where ethylene glycol and ammonium adipate are selected as the basic electrolyte.
【表】
第２表に於て、Ｚ／Zoは第１表と同義であ
り、又、Ａ及びＢは夫々、第２表の試験に供され
たコンデンサの封口板３の内面を構成する合成樹
脂板４がフエノール樹脂製である場合及びポリプ
ロピレン樹脂製である場合を示す。
第２表から明らかな如く、合成樹脂板４がポリ
プロピレン製の場合酸化ホウ素の添加量が0.5〜
10重量％の範囲で有効である。
尚、本発明に於て、水素ガス発生によるコンデ
ンサ内圧上昇を防ぐための水素吸収剤及び酸化ホ
ウ素の夫々の効果は有効に生ずることが確認され
た。例えば、エチレングリコール100c.c.、アジピ
ン酸アンモニウム５ｇからなる基本電解液に酸化
ホウ素２重量％及び水素吸収剤としてのジニトロ
フエノール0.5ｇを添加した電解液を用いて第１
表と同種の試験をなしたところ、Ｚ／Zoが1.16、
腐蝕発生がなく更にコンデンサ内圧の上昇も認め
られなかつた。
以上の説明より明らかな如く、本発明によれ
ば、主溶媒エチレングリコールにイオノーゲンと
して有機カルボン酸のアンモニウム塩を溶解した
電解液に酸化ホウ素を添加することによりポリプ
ロピレン樹脂を内面とする封口板で封口されたコ
ンデンサ内での腐蝕が防止されて信頼性の高いア
ルミニウム電解コンデンサを得ることができる。[Table] In Table 2, Z/Zo has the same meaning as in Table 1, and A and B each represent the composition constituting the inner surface of the sealing plate 3 of the capacitor subjected to the test in Table 2. A case where the resin plate 4 is made of phenolic resin and a case where the resin plate 4 is made of polypropylene resin are shown. As is clear from Table 2, when the synthetic resin plate 4 is made of polypropylene, the amount of boron oxide added is 0.5~
It is effective in the range of 10% by weight. In the present invention, it has been confirmed that the effects of the hydrogen absorbent and boron oxide to prevent an increase in the internal pressure of the capacitor due to the generation of hydrogen gas are effectively produced. For example, using an electrolytic solution containing 100 c.c. of ethylene glycol and 5 g of ammonium adipate to which 2% by weight of boron oxide and 0.5 g of dinitrophenol as a hydrogen absorbent was added,
When the same type of test as shown in the table was conducted, Z/Zo was 1.16,
No corrosion occurred and no increase in the internal pressure of the capacitor was observed. As is clear from the above description, according to the present invention, boron oxide is added to an electrolytic solution in which an ammonium salt of an organic carboxylic acid as an ionogen is dissolved in ethylene glycol as a main solvent, and the sealing plate is sealed with a polypropylene resin inner surface. Corrosion within the capacitor is prevented and a highly reliable aluminum electrolytic capacitor can be obtained.
図は典型的なアルミニウム電解コンデンサの断
面図を示し、１は巻回素子、２はケース、３は封
口板である。
The figure shows a cross-sectional view of a typical aluminum electrolytic capacitor, where 1 is a wound element, 2 is a case, and 3 is a sealing plate.
Claims (1)
口されたアルミニウム電解コンデンサ用電解液で
あつて、主溶媒エチレングリコールにイオノーゲ
ンとしてスベリン酸、アジピン酸又はセバチン酸
のアンモニウム塩を溶解した電解液に酸化ホウ素
を0.5〜10重量％添加したことを特徴とするアル
ミニウム電解コンデンサ駆動用電解液。1 An electrolytic solution for aluminum electrolytic capacitors sealed with a sealing plate with a polypropylene resin inner surface, in which boron oxide is added to the electrolytic solution in which ammonium salts of suberic acid, adipic acid, or sebacic acid are dissolved as ionogen in ethylene glycol as the main solvent. An electrolytic solution for driving an aluminum electrolytic capacitor, characterized in that 0.5 to 10% by weight is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10892982A JPS584917A (en) | 1982-06-23 | 1982-06-23 | Electrolyte for driving aluminum electrolytic condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10892982A JPS584917A (en) | 1982-06-23 | 1982-06-23 | Electrolyte for driving aluminum electrolytic condenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS584917A JPS584917A (en) | 1983-01-12 |
| JPS6258650B2 true JPS6258650B2 (en) | 1987-12-07 |
Family
ID=14497231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10892982A Granted JPS584917A (en) | 1982-06-23 | 1982-06-23 | Electrolyte for driving aluminum electrolytic condenser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS584917A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013623B2 (en) | 2004-09-13 | 2011-09-06 | Cascade Microtech, Inc. | Double sided probing structures |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2773446B2 (en) * | 1991-03-13 | 1998-07-09 | 日立エーアイシー株式会社 | Electrolyte for electrolytic capacitors |
-
1982
- 1982-06-23 JP JP10892982A patent/JPS584917A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013623B2 (en) | 2004-09-13 | 2011-09-06 | Cascade Microtech, Inc. | Double sided probing structures |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS584917A (en) | 1983-01-12 |
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