DE539468C - Process for dyeing smooth fabrics or fabrics printed with reserves made from animal fibers with leuco ester salts of Kuepen dyes in an alkaline bath - Google Patents

Description

Process for dyeing smooth fabrics or fabrics printed with reserves animal fibers with leuco ester salts of vat dyes in an alkaline bath Up until now it was customary to use leuco ester salts of vat dyes in an acidic medium at higher Apply temperature to the animal fiber and the dye by subsequent To develop oxidation on the fiber. In British patent specification 26o 638 it is also the treatment of animal fibers with alkaline solutions of a leuco ester salt of an isopene dye mentioned.

It has now been found that the leuco ester salts of the vat dyes let it fix in an alkaline medium on the animal fiber particularly advantageously, if reducing agents are added to the bath, the subsequent oxidation of the Dye can be done by one of the customary methods. l`Surprisingly is no higher for the fixation of the leuco ester salts on the animal fibers Temperature required, rather it already takes place at ordinary temperature themselves.

Compared with the previously used dyeing methods, this brings a new cold dyeing method practical advantages in multiple ways with itself. So it is as opposed to the previously usual coloring methods easily possible through suitable combinations of mixed shades to manufacture. Furthermore, you can first of all fat, wax and other on the material to be dyed Apply mechanical reserves that result in the subsequent fixation of the ester salts the fact that temperature increases are avoided without damage tolerate. In this way, white or colored batik effects are obtained on a colored base of a purity and beauty as hitherto obtained with the use of leuco ester salts could not be obtained from vat dyes.

The present process can be used not only for the animal fibers but also for mixed fabrics containing them. Example i Bleached wool is first provided with a wax reserve (beeswax) that is common in batik articles and then treated in the following way: After about one hour of treatment in the cold, washing is carried out in water and the dye is developed in a bath containing 20 g of potassium persulfate, 20 cc of sulfuric acid 66 ° Be per liter, at about 35 ° (cf. Patent 486 17q), then washed and dried . The wax is then removed in the manner customary for batik articles (e.g. treatment with petrol, benzene or the like) and finally, if necessary, warm soaped and washed again. In this way you get white effects on a purple background. Example The dyeing is carried out as described in Example i. After the wax reserve has been thoroughly removed, the material to be dyed is printed again with the same wax reserve in any pattern after drying. B. io g of an ester salt of the dye, prepared according to example i of patent 42 053, per liter of liquor, dyed cold, washed, taken through the oxidation bath specified in example i and, as further indicated there, aftertreated. After removing the wax reserve, white and yellow effects are then obtained on a violet background and on the mixed shade of violet with yellow. Example 3 The wool, silk, etc. is dyed in light to medium shades, e.g. B. with an acid or substantive dye suitable for wool and silk, and applies the wax reserve to the pre-dyed and previously dried goods and colors as in Example i with a leuco ester salt in the manner specified there.

By adding hydrosulfite conc. Powder for the latter dye bath, if the pre-coloring is made with etchable dyes, much livelier ones Composition of shades can be achieved, as in place of the usual over-dyeing the pure hue obtained by the coincidence of the two hues of the dye used for dyeing is obtained. Example q. One colors the wool, silk or the like with the sulfuric acid ester of the leuco compound of 5 # 5'-diethoxythioindigos on wax reserve in the manner indicated in example i and thus has white effects on an orange background. You can then either with acid or dye over other wool dyes, whereby it should be noted that in addition to the colorful effect, which results from the dyes used for over-dyeing, also a mixed dyeing obtained from both dyes as a reason.

Example s silk (weighted and carefree), if necessary beforehand is provided with a wax reserve, is colored according to Example i with a leuco ester salt and then after a short rinse in water in a bath containing 1 to 2 g of potassium chromium and 10 cc sulfuric acid per liter. Then, as stated in example i, further treated.

Example 6 Bleached piece of wool or weighted or light weight silk is printed on the roller printing machine with deeply engraved heated rollers with a fat reserve of approximately the following composition: 50 g beeswax, 65o g rosin, 3o- whale advice, i 5 g melted mutton tallow, 25g paraffin and 230 g turpentine oil 1000 g. After printing, it is dyed, rinsed and post-oxidized in a dyebath of a leuco ester salt of the composition given in Example i. After development has taken place, it is washed thoroughly, dried and the fat reserve is drawn off with one of the known solvents. Example ? It is dyed in dyebaths of leuco ester salts of the composition given in Example i in the cold on suitable dyeing machines, e.g. B. piece dyeing vats or jiggers, and oxidized in the aforementioned manner, whereby uni dyeings can be produced. Example 8 Spun or woven dyed material (light-weight or weighted silk or chlorinated wool) is printed in equipment ready for printing and possibly previously with wax reserve, in a bath of the following composition Treated cold to slightly lukewarm for one hour. Then the dye is developed either according to example i with potassium persulphate sulfuric acid or according to example with chromium potassium sulfuric acid.

Example 9 The textiles listed in Example 18 are in a bath of the following composition Treated for about an hour and then finished as indicated in Example 8.

Claims (1)

PATENT CLAIM: Process for dyeing smooth or printed with reserves Fabric made from animal fibers with leuco ester salts of vat dyes in alkaline Bath, characterized in that the tissues are added to the alkaline bath colors of reducing agents and then the colorations in the usual way with suitable Oxidizing agents developed.