DE1108812B - Electrolyte for electrolytic capacitors - Google Patents
Electrolyte for electrolytic capacitorsInfo
- Publication number
- DE1108812B DE1108812B DEV10690A DEV0010690A DE1108812B DE 1108812 B DE1108812 B DE 1108812B DE V10690 A DEV10690 A DE V10690A DE V0010690 A DEV0010690 A DE V0010690A DE 1108812 B DE1108812 B DE 1108812B
- Authority
- DE
- Germany
- Prior art keywords
- electrolyte
- electrolytic capacitors
- allyl alcohol
- solvent
- base
- 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.)
- Pending
Links
- 239000003792 electrolyte Substances 0.000 title claims description 25
- 239000003990 capacitor Substances 0.000 title claims description 14
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 10
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 230000032050 esterification Effects 0.000 claims 1
- 238000005886 esterification reaction Methods 0.000 claims 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 3
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 150000004808 allyl alcohols Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
- H01G11/62—Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Description
Elektrolyt für elektrolytische Kondensatoren Gegenstand der Erfindung ist ein Elektrolyt für elektrolytische Kondensatoren für tiefe Temperaturen.Electrolyte for electrolytic capacitors is the subject of the invention is an electrolyte for electrolytic capacitors for low temperatures.
Für elektrolytische Kondensatoren werden im allgemeinen Elektrolyte verwendet, die aus schwachen Säuren, insbesondere Borsäure bzw. deren Salzen und Alkoholen, vorzugsweise Glykol oder Glycerin, zusammengesetzt sind. Diese Bestandteile werden einem Kochprozeß unterworfen, durch den sie zum Teil verestert werden und gleichzeitig dickflüssigere Konsistenz annehmen, indem das Lösungs- und Esterwasser entsprechend der angewendeten Kochtemperatur sich verflüchtigt. Derartige Elektrolyte sind für den Betrieb in Kondensatoren bei tiefen Temperaturen nicht brauchbar, da sie zu zähflüssig werden und zum Teil auskristallisieren, wodurch ihre Leitfähigkeit unter das geforderte Minimum absinkt, und Korrosionsgefahr für das verwendete Elektrodenmaterial besteht. Zur Vermeidung dieser Nachteile wurden bereits Wege beschritten, den beschriebenen Elektrolyten durch Lösen in nicht wäßrigen Lösungsmitteln, z. B. ein- oder mehrwertigen Alkoholen, Äthern, Estern, Ketonen usw., zu verdünnen und damit sowohl die Leitfähigkeit auf den gewünschten Wert zu erhöhen als auch gleichzeitig die Korrosionsgefahr durch Auskristallisieren bei tiefen Temperaturen zu verhindern. Derartige Lösungsmittel, wie z. B. Methylglykal, ergeben im allgemeinen eine Erweiterung des Betriebstemperaturbereiches der Kondensatoren bis etwa - 40°C, jedoch wird die obere Grenze der Betriebstemperatur, die für die Tieftemperatur-Elektrolytkondensatoren -f- 70°C beträgt, infolge des erhöhten Dampfdruckes, den derartige Lösungsmittel aufweisen, eingeschränkt. Gleichzeitig tritt bei Absinken der Temperatur unter etwa - 10° C ein sprunghafter Kapazitätsrückgang ein, der es erschwert, die gemäß DIN-Vorschriften für Temperaturen von - 40° C zugelassenen Werte für den Kapazitätsabfall einzuhalten. In analoger Weise steigt mit fallender Temperatur der Verlustfaktor beachtlich an. Um die genannten Nachteile beheben zu können, war man bereits um ein geeignetes Lösungsmittel bemüht, das den Elektrolyt auch für einen erweiterten Temperaturbereich verwendbar macht. Zunächst wurde aber nur das Lösungsmittel Furfurylalkohol gefunden, das wohl für weit höhere Betriebstemperaturen als bisher brauchbar ist, jedoch nicht für tiefere.Electrolytes are generally used for electrolytic capacitors used, the weak acids, especially boric acid or its salts and Alcohols, preferably glycol or glycerin, are composed. These components are subjected to a cooking process through which they are partially esterified and at the same time take on a thicker consistency by adding the solution and ester water volatilizes according to the cooking temperature used. Such electrolytes are not suitable for operation in capacitors at low temperatures because they become too viscous and partially crystallize, reducing their conductivity drops below the required minimum, and there is a risk of corrosion for the electrode material used consists. To avoid these disadvantages, ways have already been taken, the one described Electrolytes by dissolving in non-aqueous solvents, e.g. B. mono- or polyvalent Alcohols, ethers, esters, ketones, etc., dilute and thus both the conductivity to increase to the desired value and at the same time reduce the risk of corrosion Prevent crystallization at low temperatures. Such solvents, such as B. methylglycal, generally result in an expansion of the operating temperature range of the capacitors down to about - 40 ° C, but the upper limit of the operating temperature, which for the low-temperature electrolytic capacitors -f- is 70 ° C, due to the increased vapor pressure that such solvents have limited. Simultaneously When the temperature drops below about - 10 ° C, a sudden drop in capacity occurs one that makes it difficult to use the DIN regulations for temperatures of - 40 ° C The values for the drop in capacity must be observed. In an analogous way increases with decreasing Temperature, the loss factor increases considerably. To remedy the mentioned disadvantages can, one was already trying to find a suitable solvent that the electrolyte also makes it usable for an extended temperature range. But first it was only the solvent furfuryl alcohol was found, which is probably for much higher operating temperatures than is usable up to now, but not for deeper ones.
In dem weiteren Bestreben, ein Lösungsmittel zu finden, das sowohl für relativ hohe als für besonders tiefe Betriebstemperaturen geeignet ist, wurden entsprechende Versuche an einer Reihe von verschiedenen Substanzen durchgeführt und dabei folgende Erkenntnisse gewonnen: Zur Herstellung von Elektrolyten für den genannten Zweck hat es sich als notwendig erwiesen, solche Elektrolyte zu verwenden, bei denen der Grundelektrolyt mit einem solchen Lösungsmittel verdünnt ist, das gleichzeitig einen Siedepunkt >_ '.- 90° C und einen Erstarrungspunkt von mindestens -70°C - möglichst jedoch noch tiefer - hat, das außerdem hydrophilen Charakter trägt, d. h. mit Wasser in jedem Verhältnis mischbar ist und sich weder selbst noch durch seine Umsetzungsprodukte auf die übrigen Komponenten des Elektrolyten oder die Aufbaumaterialien des Kondensators schädlich auswirkt. Diese Forderungen werden gemäß der Erfindung dadurch erfüllt, daß als Lösungsmittel für den Grundelektrolyten bzw. für die Herstellung des Grundelektrolyten Allylalkohol verwendet wird. Einen brauchbaren Elektrolyten erhält man z. B. durch Mischen von kristalliner Borsäure mit Glykol in einem Gewichtsverhältnis von 1 : 2 und Zugabe von konzentriertem Ammoniak bis zum pH 6,0. Diese Bestandteile werden bis zum Erreichen einer Temperatur von + 130 bis 135° C erwärmt und nach dem Erkalten in der doppelten Gewichtsmenge Allylalkohol gelöst. Die Leitfähigkeit dieser Lösung beträgt bei '-. 30° C etwa 1900 gS/cm, bei - 40° C etwa 63 gS/cm und bei -60°C etwa 10 gS/cm. Die Funkenspannung eines so hergestellten Elektrolyten, gemessen an glatten Aluminium-Elektroden, liegt bei 470 bis 500 V. Kondensatoren (6/8 V, glatte Folie), die mit dem beschriebenen Elektrolyten hergestellt wurden, ergaben für -40°C einen Kapazitätsabfall von etwa 22-1/o gegenüber der Kapazität bei Raumtemperatur (zulässig nach den DIN-Vorschriften ist ein Kapazitätsabfall von 50 %). Der Verlustfaktor dieser Kondensatoren hat bei - 40° C einen Wert von etwa 0,4 ... 0,5, der ebenfalls sehr günstig liegt.In the further endeavor to find a solvent that is suitable for both relatively high and particularly low operating temperatures, corresponding tests were carried out on a number of different substances and the following findings were made: For the production of electrolytes for the purpose mentioned, it has been found proved necessary to use electrolytes in which the base electrolyte is diluted with such a solvent that has a boiling point> _ '.- 90 ° C and a freezing point of at least -70 ° C - but if possible even lower - has also has a hydrophilic character, ie it is miscible with water in any ratio and does not have a harmful effect either itself or through its reaction products on the other components of the electrolyte or the construction materials of the capacitor. According to the invention, these requirements are met in that allyl alcohol is used as the solvent for the base electrolyte or for the production of the base electrolyte. A usable electrolyte is obtained, for. B. by mixing crystalline boric acid with glycol in a weight ratio of 1: 2 and adding concentrated ammonia to pH 6.0. These components are heated until a temperature of + 130 to 135 ° C is reached and, after cooling, dissolved in twice the amount by weight of allyl alcohol. The conductivity of this solution is at '-. 30 ° C about 1900 gS / cm, at -40 ° C about 63 gS / cm and at -60 ° C about 10 gS / cm. The spark voltage of an electrolyte produced in this way, measured on smooth aluminum electrodes, is 470 to 500 V. 22-1 / o compared to the capacity at room temperature (according to DIN regulations, a capacity drop of 50% is permitted). The loss factor of these capacitors has a value of about 0.4 ... 0.5 at - 40 ° C, which is also very favorable.
Für Hochvolt-Kondensatoren fallen diese Werte noch wesentlich besser aus. Besondere Korrosionserscheinungen nach Dauerversuchen unter Temperaturwechsel und teilweiser stromloser Lagerung konnten an den Aufbaumaterialien der Kondensatoren nicht festgestellt werden. Es ist ferner möglich, auch den Alkohol des Grundelektrolyten (meist Glykol und Glycerin) durch Allylalkohol zu ersetzen, wobei dieser mit der Borsäure oder anderen geeigneten Säuren bzw. deren Salzen teilweise verestert wird. Beim Betrieb von elektrolytischen Kondensatoren können unter Umständen chemische Umwandlungen des Elektrolyten durch den Einfluß des Ionenstromes hervorgerufen werden. Vor allem sind Oxydationserscheinungen an der Anode des Kondensators zu erwarten, welche bei Verwendung der üblichen Alkohole, Glykol usw. als Lösungsmittel leicht zur Bildung von Fettsäuren führen, die ihrerseits teilweise ein ungünstiges Korrosionsverhalten hervorrufen können. Die Oxydation des ungesättigten Allylalkohols führt unter dem Einfiuß des Anodenpotentials bevorzugt zunächst zur Aufspaltung der Doppelbindung, wobei unter anderem zuerst gesättigte mehrwertige Alkohole, die keine korrodierenden Eigenschaften besitzen, gebildet werden.For high-voltage capacitors, these values are even better the end. Particular signs of corrosion after long-term tests with temperature changes and partial electroless storage could be caused by the construction materials of the capacitors cannot be determined. It is also possible to use the alcohol of the base electrolyte (mostly glycol and glycerine) to be replaced by allyl alcohol, this with the Boric acid or other suitable acids or their salts is partially esterified. When operating electrolytic capacitors, chemical Conversions of the electrolyte are caused by the influence of the ion current. Above all, oxidation phenomena are to be expected at the anode of the capacitor, which easily when using the usual alcohols, glycol, etc. as solvents lead to the formation of fatty acids, some of which in turn have an unfavorable corrosion behavior can evoke. The oxidation of the unsaturated allyl alcohol leads under the Influence of the anode potential first of all to split the double bond, where among other things first saturated polyhydric alcohols, which are not corrosive Possess properties, are formed.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV10690A DE1108812B (en) | 1956-05-26 | 1956-05-26 | Electrolyte for electrolytic capacitors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV10690A DE1108812B (en) | 1956-05-26 | 1956-05-26 | Electrolyte for electrolytic capacitors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1108812B true DE1108812B (en) | 1961-06-15 |
Family
ID=7573189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV10690A Pending DE1108812B (en) | 1956-05-26 | 1956-05-26 | Electrolyte for electrolytic capacitors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1108812B (en) |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1959130A (en) * | 1931-08-22 | 1934-05-15 | Benwood Linze Company | Condenser |
GB439788A (en) * | 1935-05-28 | 1935-12-13 | Francis Christopher Stephan | Improvements in or relating to electrolytes for use in electrolytic condensers |
FR820613A (en) * | 1936-04-15 | 1937-11-16 | Method and device for the manufacture of electrolytic capacitors with porous and absorbent intermediate layer | |
US2120816A (en) * | 1935-11-01 | 1938-06-14 | Solar Mfg Corp | Impregnating process for electrolytic condensers |
US2122756A (en) * | 1935-09-11 | 1938-07-05 | Seiar Mfg Corp | Electrolytic condenser |
GB504281A (en) * | 1937-10-19 | 1939-04-19 | British Electrolytic Condenser | Improvements in electrolytic cells |
GB504280A (en) * | 1937-10-19 | 1939-04-19 | British Electrolytic Condenser | Improvements in electrolytic cells |
US2168156A (en) * | 1938-07-30 | 1939-08-01 | Gen Electric | Capacitor composition |
CH225451A (en) * | 1940-05-27 | 1943-01-31 | Fides Gmbh | Electrolytic capacitor. |
CH236480A (en) * | 1942-02-18 | 1945-02-15 | Sueddeutsche Apparate Fabrik G | Electrolytic capacitor. |
CH246109A (en) * | 1944-06-08 | 1946-12-15 | Fides Gmbh | Process for the production of metal electrodes of electrical capacitors coated with non-conductive reaction products. |
GB600322A (en) * | 1944-09-07 | 1948-04-06 | Aerovox Corp | Improvement in art of impregnation |
US2444725A (en) * | 1944-08-09 | 1948-07-06 | Sprague Electric Co | Electrolytic condenser |
GB610779A (en) * | 1945-04-30 | 1948-10-20 | Condensateurs Blindes | A method of making electric condensers and apparatus therefor |
GB679539A (en) * | 1947-12-26 | 1952-09-17 | Aerovox Corp | Improvements in electrostatic capacitors |
DE761262C (en) * | 1942-04-02 | 1954-03-08 | Siemens & Halske A G | Device for the impregnation of electrical devices and device parts, in particular layered or wound bodies, e.g. B. of electrostatic or electrolytic capacitors |
CH302295A (en) * | 1944-02-18 | 1954-10-15 | Gmbh Robert Bosch | Electrical device that contains an electrolyte, particularly an electrolytic capacitor. |
-
1956
- 1956-05-26 DE DEV10690A patent/DE1108812B/en active Pending
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1959130A (en) * | 1931-08-22 | 1934-05-15 | Benwood Linze Company | Condenser |
GB439788A (en) * | 1935-05-28 | 1935-12-13 | Francis Christopher Stephan | Improvements in or relating to electrolytes for use in electrolytic condensers |
US2122756A (en) * | 1935-09-11 | 1938-07-05 | Seiar Mfg Corp | Electrolytic condenser |
US2120816A (en) * | 1935-11-01 | 1938-06-14 | Solar Mfg Corp | Impregnating process for electrolytic condensers |
FR820613A (en) * | 1936-04-15 | 1937-11-16 | Method and device for the manufacture of electrolytic capacitors with porous and absorbent intermediate layer | |
GB504281A (en) * | 1937-10-19 | 1939-04-19 | British Electrolytic Condenser | Improvements in electrolytic cells |
GB504280A (en) * | 1937-10-19 | 1939-04-19 | British Electrolytic Condenser | Improvements in electrolytic cells |
US2168156A (en) * | 1938-07-30 | 1939-08-01 | Gen Electric | Capacitor composition |
CH225451A (en) * | 1940-05-27 | 1943-01-31 | Fides Gmbh | Electrolytic capacitor. |
CH236480A (en) * | 1942-02-18 | 1945-02-15 | Sueddeutsche Apparate Fabrik G | Electrolytic capacitor. |
DE761262C (en) * | 1942-04-02 | 1954-03-08 | Siemens & Halske A G | Device for the impregnation of electrical devices and device parts, in particular layered or wound bodies, e.g. B. of electrostatic or electrolytic capacitors |
CH302295A (en) * | 1944-02-18 | 1954-10-15 | Gmbh Robert Bosch | Electrical device that contains an electrolyte, particularly an electrolytic capacitor. |
CH246109A (en) * | 1944-06-08 | 1946-12-15 | Fides Gmbh | Process for the production of metal electrodes of electrical capacitors coated with non-conductive reaction products. |
US2444725A (en) * | 1944-08-09 | 1948-07-06 | Sprague Electric Co | Electrolytic condenser |
GB600322A (en) * | 1944-09-07 | 1948-04-06 | Aerovox Corp | Improvement in art of impregnation |
GB610779A (en) * | 1945-04-30 | 1948-10-20 | Condensateurs Blindes | A method of making electric condensers and apparatus therefor |
GB679539A (en) * | 1947-12-26 | 1952-09-17 | Aerovox Corp | Improvements in electrostatic capacitors |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2618616C3 (en) | Electrolyte for electrolytic capacitors | |
DE2209095B2 (en) | ELECTROLYTE FOR ELECTROLYTE CAPACITORS | |
DE68919064T2 (en) | Long chain dicarboxylic acid containing electrolyte for aluminum electrolytic capacitors for high voltage. | |
DE2118435A1 (en) | ||
DE1546079B2 (en) | AZEOTROPIC SOLVENT MIXTURE IN PARTICULAR FOR THE REMOVAL OF A RESIN FLUX FROM PRINTED CIRCUITS | |
DE1108812B (en) | Electrolyte for electrolytic capacitors | |
DE2549951A1 (en) | CAPACITOR AND METHOD FOR PRODUCING THE ELECTROLYTE | |
DE3889020T2 (en) | Electrolytic capacitor. | |
DE1291834B (en) | Process for the electrochemical roughening of heavy metal bodies for their use as electrodes in electrolytic capacitors | |
CH501302A (en) | Solution of partly neutralizer phthalic acid in ethylene - glycol monomethyl ether as capacitor electrolytic | |
DE2049098A1 (en) | Capacitor electrolyte - contg gamma-butyrolactone and/or dmf and a gl | |
DE1614166C2 (en) | Electrolytic capacitor | |
DE461493C (en) | Electrically insulating mass for the construction of partitions u. like | |
DE2238463A1 (en) | Electrolyte for electrolytic capacitors - contg monomethylformamide as a solvent | |
DE970448C (en) | Electrolyte for electrolytic capacitors | |
DE1221728B (en) | Electrolyte with improved conductivity for low temperatures for electrolytic capacitors with aluminum electrodes | |
DE1564733C2 (en) | Electrolytic capacitor | |
DE2030876C3 (en) | Electrolyte for electrolytic capacitors | |
DE878416C (en) | Operating or forming electrolyte for electrolytic capacitors | |
DE870459C (en) | Process for the production of an electrolyte for solid electrolytic capacitors | |
DE1546079C (en) | Azeotropic solvent mixture, ms special for removing resin flow by means of printed circuit boards | |
DE2030876B2 (en) | ELECTROLYTE FOR ELECTROLYTE CAPACITORS | |
DE1614833C (en) | Anhydrous electrolyte for electrolytic capacitors | |
DE2458452C3 (en) | Aluminum electrolytic capacitor | |
DE1900522C (en) | Process for the preparation of an electrolyte for an electrolytic capacitor |