DE564198C - Process for the production of a coating on carbon dolls for galvanic elements - Google Patents

Description

Process for the production of a coating on carbon dolls for galvanic Elements It is known that the dolls are made of galvanic elements with a coating from wide-meshed gauze-like canvas to be covered by wrapping is attached to the charcoal doll by twine.

It is also known to provide charcoal dolls of this type with a coating, which consists of a binder, e.g. B. flour, and a porous material, e.g. B. pumice stone, Clay o. The like., Is produced and the set in such a liquid Pulp can be dipped, thereby wrapping the charcoal dolls with canvas or Avoid nettle. It is also known to have such charcoal dolls with a colloidal one Solution, which consists of a solution of silica, its salts and compounds, as is also made from dextrin, starch and similar materials.

However, practice has shown that such dipping agents mentioned above or processes are of little use in that those used for the immersion processes Materials do not have sufficient porosity, etc., in order to e.g. B. the length of work an anode battery of at least q. Months of uninterrupted use guarantee. Rather, after a very short time, each of these materials is Porosity lifted, so that the so-called breathing or working of the individual K ohlepuppen is turned off. Albeit almost the same materials in the process are used according to the invention, this will be a corresponding quantum short cut finest fibers from flax, hemp @o. Like. Attached and thereby the porosity of the dip coating is maintained until the charcoal dolls are completely used up.

By using the materials given above, especially of wheat flour, for the production of the dipping mass it is not possible to use a uniform, to achieve smooth drainage of the mass from the carbon doll after immersion, and since this is an indispensable condition, after the installation of the submerged Carbon doll in the zinc cup (zinc electrode) any mechanical caused by it To avoid disturbances, one adds an appropriate quantity of Chinese bran to the dipping mixture and thereby achieves a smooth, thin-walled coating.

It has also been shown that the specified materials are pulpy Conditions (achieved by adding water) by letting it stand after a few moments Days develop a foul smell by entering into certain bonds and at the same time show certain signs of fermentation. To counter this evil, adds one of the immersion material as a D, esinfectant carbol or the like and thereby achieves that- the immersion inassembled a almost unlimited Shows durability without the side effects described above.

The production method of the dipping compound is roughly as follows: You mix z. B. pumice stone powder, wheat flour, etc. and sets the mixture a corresponding Add a quantity of short-cut fibers. Mixing is expediently carried out in mixing drums or the like as intimately as possible. The mixture itself is stirred through a sieve before the necessary amount of water or the like. Is added. If china bran is used, it can it can be added to the dry mixture from the start. The carbol or the like will also mixed with water right at the beginning.

Claims (1)

PATENT CLAIM: Process for the production of a coating on carbon dolls for galvanic elements etc. without girding by immersion in a paste of liquid (water etc.), porous substances such as pumice stone, clay etc., and a binding agent such as flour, characterized in that Short-cut fibers and china clover with the addition of carbol or the like are mixed into this paste as a disinfectant.