CS252334B1 - Blue 1: 2 chromcomplex azo dye - Google Patents

Abstract

Blue 1:2 chromium complex azo dyes for dyeing wool and PAD from a weakly acidic to neutral bath are a mixture of a monosulfonated 1:2 chromium complex of the general formula I, where X represents -NO2 and Y, H or X represents H and Y represents a chlorine atom and M represents t Na, K, NH^ and a disulfonated 1:2 chromium complex of the general formula II, where X, Y and M have the above-mentioned meaning in the ratio I:II of 0.05 to 0.95:0.95 to 0.05.

Description

The invention relates to blue 1: 2 chromium complex azo dyes.

In the dyeing and printing of wool and PAD, the assortment of acidic, sulfosubstituted 1: 2 metal-complex azo dyes has been emerging in recent years, characterized by high stability, high cold-solubility, excellent leveling and extensibility and universal use.

They are coordination complexes 1 of the metal atom with the coordination number 6 (most often chromium or cobalt) with two identical or different o, 6-dihydroxy, o-hydroxy-6-carboxy or o-hydroxy-6-aminoazo dyes.

The water-solubility of these 1: 2 metal-complex azo dyes is increased by suitable substitution.

1: 2 metal-complex dyes solublized with non-ionic hydrophilicity-increasing substituents, such as sulfamoyl or methanesulfonyl groups, are known. However, the production of these dyes is expensive.

The same dyeing qualities were achieved by using dyes solubilized with sulfo groups. However, the incorporation of sulfo groups into a 1: 2 metal complex complex dye is not without problems. While non-ionically substituted 1: 2 metal complexes are essentially monovalent acid salts, substitution with sulfo groups increases the negative charge of color anions and thereby obviously adversely affects its dyeing properties. vytažllvost.

Moreover, the dyeing behavior is influenced not only by the electric charge, the substitution topography and the spatial arrangement of the color complex molecule.

Monosulfonated 1: 2 chromium complex dyes (1) are usually prepared by co-ordinating chromation of unsulfonated o, δ-dihydroxy, o-hydroxy-δ-carboxy or o-hydroxy-δ-aminoazo dyes with 1: 1 chromium complex o, δ-dihydroxy, o- hydroxy-6-carboxy or o-hydroxy-6-aminoazo dyes having one sulfo group per molecule. In this reaction, in addition to the desired asymmetric 1: 2 chromocomplex dye, two symmetrical 1: 2 chromocomplex azo dyes are formed to a small extent, both without sulfo group and with two sulfo groups (11) in the molecule.

Modrá Blue 1: 2 chromocomplex azo dyes consisting of a mixture of monosulfonated (1) and disulfonated (11/1: 2 chromium complex) according to the invention have now been found

where: X = NO ₂ , Y = HX - Η, Y - CL in a ratio of 1:11 - 0,05 to 0,95: 0,95 to 0,05 and obtainable by coordinating the mixture of non-sulphonated and sulphonated o , .alpha.-dihydroxyazo dyes having a 1: 1 chromium complex of .alpha.-dihydroxyazo dyes having a single sulfo group per molecule; or directly by wet mixing I and II respectively. dry.

By increasing the content of disulfonated 1: 2 chromium complex (11), the dyeing properties of the monosulfonated 1: 2 chromium complex (11) can be favorably influenced: dyes with a higher proportion of disulfonated component (11) show a marked improvement in cold solubility while maintaining other dyeing properties such as ductility and leveling . Wool and PAD dye from a weakly acid to neutral bath, they can be well combined with other dyes of the same or other metal-complex assortment or with common acid dyes.

He did

49.7 g (0.1 mol) of chromium 1: 1 1-diazo-2-naphthol-4-sulfoacid nonoazo dye complex

- 2-Naphthol in the form of a paste is introduced into a 60 ° C warm alkaline suspension of 21.63 g of the 5-nitro-2-aminophenol-1 monoazo dye. 2-naphthol (0.07 mol) and 11.82 g of 1-diazo-2-naphthol-4-sulfoacid monoazo dye 2-naphthol (0.03 mol). After a few hours of heating to 80-90 ° C, a 1: 2 mixed-dye complex dye solution was formed. Evaporation gave 120 g of a strong dye which stains wool and PAD greenish blue.

Example 2

49.7 g (0.1 mol) of chromium 1: 1 monoazo dye complex 1-diazo-2-naphthol-4-sulfoacid

2-Naphthol in the form of a paste is introduced into a 70 ° C warm alkaline suspension 23.9 g of 4-chloro-2-aminophenol-2-naphthol monoazo dye (0.08 mol) and 7.88 g of 1-diazo-2- monoazo dye naphthol-4-sulfoacid -> 2-naphthol (0.02 mol). After a few hours of heating at 90 ° C to 95 ° C, a 1: 2 mixed-color dye solution is formed. Salting out of NaCl yields 120 g of a strong dye which stains wool and PAD blue.

Example 3

49.7 g (0.1 mol) of chromium (III) 1: 1 monoazo dye complex 1-diazo-2-naphthol-4-sulfoacid> 2-naphthol paste is added to a 70 ° C warm alkaline suspension of monoazo dyes prepared by coupling 14, 4 g of 2-naphthol (0.1 mol) with 5 g of 1-diazo-2-naphthol-4-sulfoacid (0.02 mol) and diazotized 9.24 g of 5-nitro-2-aminophenol (0.06 mol) and 2.88 g of 4-chloro-2-aminophenol (0.02 mol). After heating at 90 ° C for several hours, a 1: 2 solution of chromium (III) complex was formed, which was evaporated to give 120 g of a strong dye which dyed wool and PAD greenish blue.

Example 4 g of dye I and 20 g of dye II are homogenized. 100 g of dye are obtained which stains wool and PAD with a greenish-blue hue.

Claims (1)

OBJECT OF THE INVENTION w Blue 1: 2 chromium complex dye characterized by consisting of a mixture of monosulfonated (1) and disulfonated (11/1: 2 chromium complex) I II Where M = Na, K, NH ₄ where when: X - NO ₂ , Y - HX * Η, Y - Cl in the ratio of I: II - 0.05 to 0.95: 0.95 to 0.05.