DE627276C - Process for dyeing vegetable fibers using alkali salts of tetrasulphuric acid esters of tetrahydro-1, 2-2 ', 1'-dianthraquinonazine and its derivatives - Google Patents

Description

Method for dyeing vegetable fibers using Alkali salts of the tetrasulphuric acid esters of tetrahydro-1,2-2,1 dianthraquinonazine and its derivatives The tetrasulphuric acid esters of tetrahydro-I, 2-2, I'-dianthraquinonazine and its derivatives (prepared, for example, according to the patent specifications 470 809, 579 527, 580013, 580 534 and 584 718 known methods) have a very low affinity for vegetable fibers. By adding salts, e.g. B. sodium sulfate, the absorption capacity of the fibers for the ester salts mentioned can be used in the dye bath can be increased somewhat (see patent specification 432 7a6). But even this can only be done at a higher level Ester salt concentration in the dye bath dyeings of medium strength are obtained, a large part of the ester still remaining unused in the dyebath.

It has now been found that at a certain bath concentration Can produce much deeper colorations if the coloration is smaller in the presence Amounts of own organic acid, such as. B. formic acid, acetic acid, lactic acid, is made. Instead of organic acids, small amounts can be very diluted Mineral acids or acidic salts such as ammonium acetate, ammonium formate, Ammonium sulfate, can be used. It is convenient to use salts such as sodium acetate, sodium formate or sodium sulfate, to mitigate the effects of the acid. An addition of sodium chloride or sodium sulfate causes a better absorption of the here too Esters on the fiber. The amount of acid added depends on the composition of the ester used and can vary within certain limits. The baths pull out almost completely. -The present dyeing process also allows, of course the use of the tetrasulfuric acid esters mentioned in a mixture with sulfuric acid esters of other leuco vat dyes or compounds; which on the barrels through acidic oxidation converts into dyes.

The process is illustrated by the following examples, without it limited to the following information with regard to the proportions and temperatures shall be. Example i The following dye bath is prepared for 10 kg of cotton rope: 2001 water, 100g tetrasulfuric acid ester salt of 3, 3-dichlorotetrahydro - 1, 2-2, 1'-dianthraquinone azine, 5 kg anhydrous sodium sulfate, 500 g sodium acetate.

The material to be dyed is treated at room temperature for i @ 5 minutes in this fleet. Then 41 10% acetic acid is added and another one is colored Quarter of an hour at 4mm temperature with good changing. Then! Takes place again an addition of 4 1 10% acetic acid. You dye again another quarter of an hour at room temperature. Then the yarn is then, without to rinse, wrung out or ejected. The coloring is now in a fresh Bath developed by acidic oxidation. For this purpose, the goods are kept at room temperature in a bath containing 2001 water, 72 kg of 96 percent sulfuric acid and 0.2 kg Sodium nitrite, removed during 10 meows, then rinsed well, neutralized and soaped at the boil. A strong blue color of excellent is obtained Authenticity properties.-BeiSpiel2 For 8 kg of cotton the jigger is made with the following Dyebath charged: 80 1 water, 40 g tetrasulfuric acid ester salt of 3, 3'-dichlorotetrahydro-1, 2-2'-dianthraquinonazine, 80 g of sodium isobutylnaphthalenesulfonate and 200 g of sodium acetate.

The dye is treated at room temperature with a solution of 2 kg anhydrous sodium sulfate and repeats the dyeing and aftertreatment five times, with the dye bath in the last four courses each time 0.4 kg of 1% Acetic acid can be added. The duration of a course should be 8 to 10 minutes. When the dyeing is finished, the dyebath is drained. Then the jigger is with 8o linen oxidation bath containing 36g 96 percent sulfuric acid and 1g sodium mitrite per liter contains, loaded. You give two courses at normal temperature, rinse, neutralize and soaps in the usual way while cooking. A blue coloration of -very good ones is obtained Authenticity properties.

Example 3 The following dye bath is prepared for 10kg of viscose strand silk: 2001 Waters, 100g tetrasulfuric acid ester salt of tetralihydro-1,2-2 ', I dianthraquinonazine 2 percent, 5 kg of anhydrous sodium sulfate and 500 g of sodium acetate.

The material to be dyed is treated at room temperature for 15 minutes in this fleet. Then, as described in Example I, acetic acid is added. The colored strand is developed, rinsed, and in a fresh oxidation bath neutralized. Finally, in his bath, 5 g of Marseilles soap per liter and contains 3 g of crystallized sodium sulfite, soaped at 80 ° C.

A strong blue coloration of the viscose silk from the known ones is obtained excellent fastness properties.

In a corresponding manner, staining with the easily soluble Ester salts of 3, 3 '- dimethyltetrahydro - 1,' 2-2 ', I - dianthraquinone azine, TefrahydrQ - I, 2 - 2 ', I' - dianthrachiriOnazin - 3, 3 'dicarboxylic acid, tetrahydro-1, 2-2', I'-dianthraquinonazine-3, 3'-disulfonic acid diethylamide made from vegetable fiber will..........

Claims (2)

PATENT CLAIMS: I. Process for dyeing vegetable fibers under Use of full A1 potassium salts of the tetrasulfuric acid esters of tetrahydro - I, 2-2 ' I '- dianthraquinonazine and its derivatives, characterized in that dye baths with a low content of organic acids or dilute mineral acids or acidic salts are used and the color, as usual, develops. 2nd embodiment of the method according to claim i, characterized idura the use of dye baths with a lingering ': content of salts which -decrease the acidity of the bath. ; -