DE905418C - Process for the production of casein threads or fibers - Google Patents

Description

P. 175)

ISSUED MARCH 1, 1954

F 358 IV c 129 b

The invention relates to the production of artificial textile threads or fibers, which are essentially formed from casein, and relates to washing manipulations and / or or insolubilization of freshly spun structures.

Italian patent 348 661 stipulates that in the production of casein fibers or mixed casein-cellulose fibers, the aftertreatment the filaments in a sodium chloride and / or aluminum salt bath after precipitation Immediate or subsequent addition of formaldehyde must be carried out to prevent the destruction to prevent the formation.

The new invention relates to a method for the production of casein threads or fibers, which therein consists that the by spinning a casein solution in a bath containing acids and salts or threads or fibers obtained in baths already used for the production of synthetic viscose threads in one or more containing one or more neutral salts and / or acid salts Salt baths chosen from ammonium salts, alkali salts and alkaline earth salts, with the addition of formaldehyde in the first bath and / or at least in one of the following baths be treated afterwards.

It has also been found that a felling bath can also be used for the spinning of viscose artificial silk can use used baths, which are depleted in their content of acids and salts; others can also go to these baths

905413

Salts are added so that. not less than 25 grams per liter of sulfuric acid is present in the bath which has a density above 1.180, to which both the acid present in the bath and the salts contribute. -

The casein threads or fibers precipitated in these baths with a low density and acidic unit stick together not with each other if they are subsequently put into salt wash solutions and / or insolubilizing solutions be dived.

R u η g sb e i s ρ i e Ie

A. The precipitated threads are in one or more, e.g. 150g sodium sulfate, 50g zinc sulfate, 30 g of magnesium sulphate, with or without the addition of aluminum salts, containing sodium chloride Baths treated. The formaldehyde can be added to the first bath or to a subsequent salt bath of the same composition or the salts and the quantities involved can be changed. The specific Salt quantities are per liter of bath water.

B. The precipitated and stacked fibers are treated in one or more salt baths, which z. B. 30 g ammonium sulfate, 30 g ammonium chloride, 100 g sodium chloride, 150 g aluminum sulfate contain. The formaldehyde can be used in the first salt bath or in a subsequent salt bath the same composition can be added, the salts and the relevant Quantities can be changed. The specific amounts of salt are per liter of bath water.

C. The content of salts in the baths according to Examples A and B can be in the broadest Limits fluctuate and can even reach the salt saturation of the baths, whereby also other salts of alkali metals and alkaline earth salts, ammonium and the like can be used, z. B. Acetates, Formates, Chlorides, Sulphates, etc. A A very low salt content is possible if other substances are added to the baths, their own Increase density; these substances must of course not have to be solvents of casein, but the same be neutral, acidic or coagulate the casein.

D-. The felled threads are in an or treated several salt baths, the z. B. per liter of bath water 200 g of sodium sulfuric acid, 50 g Contain aluminum formate and 30 to 40 g formaldehyde.

Claims (3)

Patent claims: i. Process for the production of casein threads or fibers, characterized in that they are produced by spinning a casein solution in a bath containing acids and salts or in the manufacture of synthetic viscose threads used baths obtained threads or fibers in one or more one or more. neutral salts and / or salt baths containing acid salts, which are among the ammonium salts, Alkali salts and alkaline earth salts are selected, with the addition of formaldehyde in the first bath and / or at least in treated in one of the following baths. 2. The method according to claim 1, characterized in that that aluminum salts are added to one or more of the aftertreatment baths. 3. The method according to claims 1 and 2, characterized in that the precipitation "of the filaments in the acidic salty baths that have already been used for spinning the viscose artificial silk, with the addition of others soluble salts is carried out, the density of these baths is above 1.180 and the sulfuric acid content exceeds 25 g per liter.