DE1048261B - Process for printing textile goods with dyes - Google Patents

Description

Process for printing textile goods with vat dyes It was found that textile goods such as fibers, woven and knitted fabrics from native or regenerated Cellulose, made of natural silk or polyamides, with vat dyes in direct or You can print discharge printing if you use the printing pastes in addition to the usual thickeners water-insoluble reducing agents, alkali hydroxides and acidic alkali or ammonium salts the carbonic acid adds.

As water-insoluble reducing agents are z. B. the alkaline earth or Heavy metal salts, such as the calcium, barium or titanium salts of the hydroxyalkylsulfinic acids, like hydroxymethanesulfinic acid, hydroxyethanesulfinic acid, hydroxy-n-propanesulfinic acid, the hydroxy-iso-propanesulfinic acid or the hydroxy-n-butanesulfinic acid and as acidic Alkali salts of carbonic acid are, for example, sodium or potassium bicarbonate called. From thickeners are z. B. starch or tragacanth and of alkali hydroxides potassium or sodium hydroxide may be mentioned.

It is known that textiles can be produced by direct or discharge printing with vat dyes can print, the printing pastes being alkaline in addition to suitable thickeners : Agents, such as sodium or potassium carbonate or sodium hydroxide and water-soluble Reducing agent, mostly in the form of the sodium salt of hydroxymethanesulfinic acid contain. After drying, the printed goods are then subjected to a heat treatment, z. B. by air-free saturated or superheated steam from 1 to 3 ata at 100 to 110OC, subjected, to fix the dyes. The prints must be as immediate as possible after drying will be steamed because water-soluble reducing agents, like that Sodium salt of hydroxymethanesulfinic acid, due to the action of humidity and the oxygen in the air are decomposed. The consequence of a more or less large one However, decomposition of the reducing agent is insufficient fixation of the dyes during subsequent steaming.

With the application of the new process, one obtains prints that are themselves after a storage time of 100 hours between drying and steaming exactly the same turn out to be flawless like the prints dampened immediately after drying.

The parts given in the examples are parts by weight.

Example 1 A cotton fabric is printed with the following printing paste: 20 parts indanthrene red FBB (Color Index 1956, Vol. II, p. 2460, Vat Red 10 / CI 67 000) 60 parts of thiodiglycol 600 parts starch-tragacanth thickening 80 parts of the calcium salt of hydroxymethanesulfinic acid 50 parts of aqueous sodium hydroxide solution 38 ° B6 50 parts sodium bicarbonate 140 parts of water 1000 parts After printing and drying, it is steamed for 7 minutes in a high-speed steamer in saturated, air-free steam at 100 ° C., rinsed, oxidized, rinsed and the prints finished. Flawless red prints are obtained.

If, after drying, the prints are stored for 96 hours at 20.degree. C. and 650.degree. C. relative humidity and then steamed, the prints turn out to be just as strong in color as prints which are steamed immediately after drying.

In the same way and with equally good success one can also use tissue printed with rayon, viscose or coppery gray.

Example 2 A fabric made of polycaprolactam is printed according to the following procedure 10 parts indanthrene brilliant green FFB (Color Index 1956, Vol. 1I, p. 2519, Vat Green 1 / CI 59 825) 30 parts of glycerin 600 parts starch-tragacanth thickening 80 parts of the calcium salt of hydroxyethanesulfinic acid 30 parts of aqueous sodium hydroxide solution 38 ° B6 50 parts potassium bicarbonate 200 parts of water 1000 parts The procedure described in Example 1 is followed and perfect green prints are obtained which, even after a storage time of 100 hours between drying and steaming, are just as strong in color as if they were steamed immediately after drying.

Example 3 A cotton fabric is dyed with 20% of the red direct dye CI Direct Red 79 / CI 29 065 (Color Index 1956, Vol. II, p.2103) and printed with the following printing paste: 40 parts indanthrene brilliant green FFB (Color Index 1956, Vol. II, p. 2519, Vat Green 1 / CI 59 825) 30 parts of glycerin 600 parts starch-tragacanth thickening 100 parts of the calcium salt of hydroxyethanesulfinic acid 30 parts of aqueous sodium hydroxide solution at 38 ° Be 50 parts potassium bicarbonate 150 parts of water 1000 parts After printing and drying, steaming is carried out for 7 minutes in a rapid steamer at 100 ° C. with air-free steam. The subdued pressure is rinsed cold, oxidized, soaped, rinsed again and dried. A bright green print is obtained on red pre-dyed cotton fabric.

Instead of the pre-dyed cotton fabric, you can also use a orange-red direct dye C. I. Direct Orange 49 / C. I. 29 050 (Color Index 1956, Bd. II, S.2055) to print dyed natural silk fabric. You then get a glowing one green print on orange pre-dyed natural silk fabric.

Claims (1)

PATENT CLAIM: Process for printing textile goods with vat dyes in direct or discharge printing, characterized in that the printing pastes in addition to the common thickeners, water-insoluble reducing agents, alkali hydroxides and contain acidic alkali or ammonium salts of carbonic acid.