DE411384C - Process for the production of acidic azo dyes - Google Patents

Description

Process for the production of acidic azo dyes. It was found, that you get new, valuable, acidic dyes if you use the i-Oxvnaphthalin-8-sulfamide with diazo compounds, which differ from the aminonaphthols, their substitution products and derivatives derived, combined and the dyes thus obtained with chromium donating itteln treated.

2 The dyes obtained in this way form bronzing powders; they dissolve in pure water with a blue to greenish-black color, which color changes to violet or black-violet on the addition of caustic alkali. On wool, they produce blue to green-black color tones, which are characterized by excellent uniformity, excellent lightfastness and very good millfastness.

Example i.

22.3 parts of i-oxynaphthalene-8-sulfamic acid, cold in an excess dissolved aqueous Ätzlalilösung, "earth with 27.2 parts of i-diazo-2-oxvnaphthalene-4.-sulfonic acid Sodium added. Is the clutch that starts immediately, which is expediently under io ° is held, the mass is made neutral with dilute hydrochloric acid, whereupon the precipitated new dye is filtered off. He represents a dark Powder, "which is in pure water with red-violet, in concentrated sulfuric acid dissolves with blue, in dilute sodium hydroxide solution with a blue-red color. He colors from sour Bathe the '\ full red-violet, after chrome plating the color turns to blue around.

The halogenated diazo compounds of r amino-2-oxynaphthalene-I-sulfonic acid and the diazo derivatives of i-amino-2-oxynaphthalene-6-sulfonic acid and 4-N-ethylene sulfic acid of i-amino-2-naphthol produce similar dyes.

Example 2.

22.3 parts of i-Oxvnaphthaliti-8-sulfamide, cold in an excess dissolved aqueous _ \ tzkkalilösung, are at 10 ° with 29.5 parts of nitrated i-diazo-2-oxynaphthalene, in-d.-sulfonic acid offset. The clutch works immediately. After the diazo compound disappeared is, the reaction product is made neutral with dilute hydrochloric acid and the precipitated dye filtered. The dye obtained in this way represents a dark one Powder, which is in pure water and in dilute sodium hydroxide solution with red-violet and dissolves in concentrated sulfuric acid with a dark blue color. He dyes wool from acid bath black-violet, <-lurch chroming beats the hue changes to black.

The diazo compound of a-amino-i-oxy-.i-nitronaphthalite-7-sulfonic acid delivers a similar product.

Example 3.

4.7.2 parts of the dye of Example i are in a boiling Mixture of 22.4 parts of potassium hydroxide, 8.36 parts of chromium oxide, 9 parts of glycerine and 13o parts of water entered and refluxed for a long time. On that the reaction mixture is diluted with 300 parts of water, neutral with hydrochloric acid and the new chromium compound precipitated with table salt. Dried notes it is a bronzing powder. It dyes wool from an acid bath in very even real, blue tones.

A very similar chromium compound is created when you use the alkaline Chromizing according to the method of patents 338o86 and 369585. Example.. 24, o parts of the dye of Example i are dissolved in 500 parts of boiling water, finitely added a chromium formate solution corresponding to 9.5 parts of Cr, O 3 and 24 hours boiled ant reflux condenser. This is followed by partial evaporation; when it cools down the new chromium compound emerges in the form of shiny crystals. This chromium compound dissolves in pure water with blue, in dilute sodium hydroxide solution with v ioletter Color on. She dyes wool from an acid bath in very even, genuine and pure, greenish blue shades.

If fluorochromium or chromium acetate is used instead of chromium formate, the result is one also uses chromium compounds, «- dye these wools really and irrelevantly blue.

Blue dyes are also obtained by treatment with chromium-releasing substances Averaging the dyes obtained by coupling the i-oxynaphthalene-4-sulfamide with at the end of the i. Diazo compounds mentioned as examples.

Example 5.

26 parts of the dye of Example 2 are in 500 parts of water Dissolved at the boil, mixed with a fluorochrome solution corresponding to 9.5 parts of Cr., 0 and boiled on the reflux condenser for 24 hours, possibly with the addition of glass. On that is partially evaporated and the chromium compound formed is obtained by salting out. This chromium compound forms a shiny bronze powder; it solves = I in pure Water with green-black, in dilute sodium hydroxide solution with purple-black color. She dyes acidic bath wool in black, real shades.

If instead of fluorine chromium, other chromium-releasing agents, such as. B. freshly precipitated chromium hydroxide hydrate, one also gets chromium compounds, which wool dye really black.

A black dye with the same properties is also obtained, if you use the dye from i-oxynaplithalin-8-sulfamide and the diazo compound of 2-Amitio-I - oxy - 4 - nitronaphthalene - 7 - sulfosätire with chromium donating agents treated.

Claims (1)

PATENT-ANSPRUCIi: Process for the production of acidic azo dyes, characterized in that the i-oxynaphthalene-8-sulfamide with diazo compounds, which differ from the ortho-aminonaphthols, their substitution products and derivatives derive, combined and the dyes thus obtained with chromium donating agents treated.