DE708355C - Process for increasing the absorption capacity of spacers made of fibrous material for electrolytic capacitors - Google Patents

Description

Process for increasing the absorbency of fibrous material existing spacers for electrolytic capacitors with the so-called dry electrolytic capacitors it is necessary to use the spacer, which is preferably made of absorbent fiber, like textiles or. Paper, consists of soaking with the electrolyte. Because the electrolyte usually a very viscous mass at normal temperature is the impregnation process generally carried out at a higher temperature. Until it is completely saturated a relatively long time is required. In some cases, the impregnation is also used made under reduced or increased pressure.

It has now become known. Made of non-fibrous material, such as. B. hard rubber or celluloaid to produce spacers for .electrolytic cells in such a way that these spacers are made very porous. The surfaces of this The resulting pores are covered with hygroscopic substances in order to achieve a faster To be able to cause penetration of the electrolyte into the spacer.

The production of such a spacer is, however, proportionate expensive and cumbersome, since it is first necessary to make this porous and the surfaces of the pores as evenly as possible with the hygroscopic substance to cover. It can also be seen that a special element, namely the hygroscopic substance, must be provided in order to absorb the electrolyte on the part of the non-fibrous spacer.

In contrast, the present invention has an electrolytic one Capacitor on the subject in which, according to the invention, the absorbency of the electrolyte carrier Serving pulp material is enlarged in that the spacers with those wetting agents are treated which have no free strong acid groups. Even small amounts of these wetting agents lower the surface tension of the liquid used, e.g. B. the electrolyte, so that this at high speed can penetrate into the fibers of the fibrous material.

With this wetting agent, therefore, a faster and more thorough one Wetting and impregnation of the spacer with the electrolyte achieved.

Wetting agents known as such in textile manufacture come in primarily ricinoleic acid (castoroleic acid) and its salts, such as. B. ricinolsaures Ammonium, or ricinolate sodium, contemplated; further the combined sulfuric acid-e-castor oil acid compounds and their esters, which are characterized by a special wetting effect .. Also esters of sulfonic acids aromatic.-hydrocarbons, which are also still substituted. can be, e.g. B. Naphtho sulfosate butyl ester. There are also substitute products of urea into consideration. All wetting agents known in the textile industry can be used which do not damage the function in electrolytic capacitors Have effects.

The use of wetting agents can create more favorable working conditions of pressure, temperature and time for the impregnation process can be selected. Another The advantage of the invention is that the structural components are also less stringent tasks must be made. Uncleaned, raw tissue, which as a result of its lack of absorbency was previously unusable when in use the appropriate wetting agents are used, as well as very dense papers, the offer many advantages in terms of high breakdown voltages and are cheaper than woven fabrics are. The same is true of the electrolyte used in the present invention viscos can be chosen. As a result of the wetting agent, the temperature during impregnation can be kept lower and the impregnation time itself is much shorter the unfavorable properties of the electrolyte, which would otherwise be caused by evaporation, Decomposition or oxidation occur, practically avoided.

The wetting agent can essentially be used in two different ways. According to the former, the spacer is treated with a solution of the Netznii: ttels before the actual impregnation and thus made receptive. The actual impregnation now follows, possibly after an intervening washing process. The excess amount of the wetting agent is washed out again by the washing process; Due to the change in the fiber, the spacer is then in a state that is favorable for the absorption of the electrolyte. After the second working method, this becomes Wetting agent directly added to the electrolyte set. . The first mode of operation has the advantage that I only use the wetting agent in very small , # centration is located in the finished capacitor lind a disturbance of the capacitor functions avoids. The second way of working has the advantage of easier hand exercise.

Claims (1)

11: 1 "I'i: N-1 ': 1Ns1'iti`C111 :: i. Procedure for enlarging the absorbency of fiber stole material existing spacers for electrical lytic capacitors, characterized by draws that the spacers with such Wetting agents are treated that do not have any have free strong acid groups. Method according to claim i, characterized golizeiclnier, d; l .; the wetting agent dem Elektrulyteli zu, esutzt @ vü-d. 3. The method according to Alisagh i, thereby marked, d113 the spacer with treated with a solution of the wetting agent will. Method according to claims i to 3, characterized in that as a wetting agent Richiolic acid or its salts are used will. 5. The method according to claim t to 3, dadurchekennzeicbnet, dal @ as a wetting agent stilftiri (-rte l "icinols; iure or their salts bz \ v. Esters can be used. G. The method according to claims i to 3, This means that it is used as a wetting agent Esters of sulfo acids of aromatic carbon ivhydrogen, possibly still substituted, turns R-erdell. Method according to claims i to 3, thereby gekeinizeicbnet, dali as a wetting agent Derivatives of urea are used. S. The method according to claim i or fol- genden, characterized in that the Spacer before imprinting with a solution of the network medium in scliu (3 is dealt with and that the excessive amount of the wetting agent a washing process') before impregnation again from eiv asclien.