DE233278C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- Yes 233 278 CLASS GROUP Sm.

Patented in the German Empire on March 11, 1910.

To pre-pickle the cotton, which is to be dyed with basic dyes, the procedure so far is that first _{treated, squeezed or pulled out in a hot tannin solution for about Y 4} to ι hour, then about Y ₂ hours in a bath of an antimony compound (tartar, antimony salt etc.) fixed, thoroughly rinsed and, if the goods for the tannin etching article (alkaline

ίο etching) was intended, was dried.

According to the present invention, these hitherto required two separate baths Operations carried out in one bath and one operation, whereby a very substantial simplification is achieved.

The present process is carried out by making the cotton with a solution of tannin,. Treated oxalic acid and an antimony compound and ''

ao dries. The thus prepared product can be colored according to ^one rinsing; for the manufacture of the tannin etched article, the imprint ■, the alkaline etching and the steaming can be used? after washing and then the goods | come straight to dyeing after rinsing without the need for the usual acid or ammonia passage. As antimony _; Connection has among other things also that '; Antimony oxalate has been shown to be particularly suitable "because when it is used, the amount of free oxalic acid required for dissolution can be reduced.

For goods that are intended to be colored in a single color, the a stain of only 10 to 25 g of tannin. in the Liters, do not dry after preparation; the procedure is thereby simplified even further.

The colorations produced by the new process differ in terms of color depth And authenticity properties are not produced by the process that has been customary up to now Colorations. In the case of the etched goods, you get very sharp patterns with good White, which is kept completely pure by weak chlorination on the drum. That for special preparation of the goods, which is often used for tannin etched articles, with ammonium oxalate, which is caused by the outflow of the alkaline discharge printing ink and the appearance of racket streaks counteracts, is superfluous with the new process, since here the in the preparation contained oxalic acid works in the same way.

The new single bath method therefore not only allows a simpler and shorter one, but also a more reliable work.

Example I,

Is dissolved separately in 450 g of tannin wooden vats with 7 ¹ / ,, 1 hot water, 450 g of oxalic acid in 3 Y ₄ 1 of hot water and 225 g of tartar emetic in 3Y ₄ 1 of hot water.

The hot solutions are mixed in such a way that the oxalic acid solution to Pour the tannin solution and slowly pour the tartar solution into the Geniisch while stirring can flow in. Tannic acid and oxalic acid can also be dissolved together.

'is for filling a chassis

calculated; the amount of tannin is chosen so that it corresponds to the amount of tannin required to produce the most common colorations Contains 30 g per liter. With stronger or weaker tannage, the amounts of Change oxalic acid and tartar emetic accordingly.

The above solution is best used at 60 to 70 °, expediently on a three-roll foulard with wooden chassis, dries the fabric in the drying chamber, rinses and colors with basic colors.

If the tannin round is to be etched, the alkaline etching color is printed on immediately after drying, steamed for 1Y ₂ minutes, washed on the wide washing machine and colored out.

Example II.

g tannin and 225 g oxalic acid are dissolved in 10 l of hot water and for this purpose the Solution of 415 g. Antimony oxalate added to 5 l of hot water; one can also do something else Add glycerine.

The fabric is treated in this solution as described in Example I.

Claims (1)

. Patent claim: Process for preparing cotton for dyeing with basic dyes, characterized in that the goods are treated with a solution of tannin, oxalic acid and an antimony compound treated.