CS252595B1 - Grey till back 1 to 2 chromocomplex azo-dye stuffs - Google Patents

Description

The invention relates to gray to black 1: 2 chromocomplex azo dyes.

In the dyeing and printing of wool and PAD, the assortment of acidic, sulfosubstituted 1: 2 metal-complex o, o'-dihydroxyazo-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 ο, ο'-dihydroxy-, o-hydroxy-o'-kaioxy- or o-hydroxy-o'-aminoazo dyes .

The water solubility of these 1: 2 metal-complex azo dyes is enhanced by suitable substitution. 1: 2 metal-complex dyes solubilized with non-ionic hydrophilicity-increasing substituents such as sulfamoyl or methanesulfonyl groups are known. However, the production of these dyes is relatively expensive.

The same dyeing qualities were also achieved using dyes solubilized with sulfo groups. However, the incorporation of sulfo groups into the 1: 2 molecule of the metal 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 the color anion and, of course, can adversely affect its dyeing properties, especially dyeing and dyeing.

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

Monosulfonated 1: 2 chromium complex dyes (I) are usually prepared by coordination chromatization of unsulfonated o, o- ^1- dihydroxyazo dyes having one sulfo group per molecule. When 1: 2 chromium-complex dye is to a small extent, both without sulfo group and with two

1: 1 ohromkomplexu of about ¹ -dihydroxyazobarviva Ostet reaction formed besides the desired asymmetric two symmetrical 1: 2 chromkomplexní dye, a sulfo group (II) in a molecule.

We have now found a gray to black 1: 2 chromium complex dye consisting of a mixture of monosulfonated (I) and disulfonated (II) 1: 2 chromium complex according to the invention

I kde

M = Na, K, NH ₄ both Z = H or NO 2

^X 2 = ^N ° 2 ' in range: ; 0.50 to 0.80 mol ^X 1 = ^N0 2- in range: i 0.20 to 0.50 mol ^Y 1 = H, in range: 0.70 to 0.90 mol ^Y 2 = NHCOCH3, in range: i 0,10 to 0.30 mol in ratio I: II = 0.05 to 0.95: 0.95 , to 0.05

and can be co-ordinated by co-ordinating chromoscopy of a mixture of unsulfonated and sulfonated o, o- ¹ -dihydroxyazo dye and a 1: 1 chromo complex of o, o'-dihydroxyazo dye containing one sulfo group per molecule, or directly by wet mixing I and II respectively. dry.

By increasing the disulfonated 1: 2 bromocomplex (II) content of the present invention, the dyeing properties of the monosulfonated 1: 2 chromium complex are favorably affected: dyes with a higher proportion of disulfonated component (II) exhibit a marked improvement in cold solubility while maintaining other dyeing properties such as ductility and leveling; wool and PAD stain from a weakly acid to neutral bath, they can be well combined with other dyes of the same or even other metal-complex assortment, or with conventional acid dyes.

Example 1

54.2 g (0.1 mol) of chromium (III) chromium 1: 1 monoazo dye complex 6-nitro-1-diazo-2-naphthol-4-sulfoacid 2-naphthol paste is introduced into a warm alkaline suspension of 19.2 g at 70 ° C (0.06 mol) monoazo dyes of 2 parts 4,5-nitro-2-aminophenol and 1 part 4-nitro-2-aminophenol parts 2-naphthol and 1 part 1,7-acetaminonaphthol (as a paste or coupling suspension), and 17.6 g (0.04 mol) of 6-nitro-1-diazo-2-naphthol-4-sulfoacid-1,2-naphthol monoazo dye (as a paste or coupling suspension). After a few hours of heating at 80-90 ° C, a 1: 2 solution of the chromium complex was formed in black. Evaporation gave 140 g of a strong dye which stains wool and PAD with a black shade.

Example 2

To a solution containing 80 g of ostalanic black FBGL is added a solution containing 20 g of chromium 1: 2 monoazo dye complex 1-diazo-2-naphthol-4-sulfoacid-2-naphthol. After mixing, the mixed dye is isolated by evaporation. 100 g of a dye are obtained which stains the wool and the PAD with a gray shade.

Example 3 g of ostalan black FBGL and 30 g of chromium 1: 2 monoazo dye complex 6-nitro-1-diazo-2-naphthol-4-sulfo-2-naphthol are homogenized. 100 g of dye are obtained which stains wool and PAD with a black shade.

Claims (2)

OBJECT OF THE INVENTION gray to black 1: 2 chromium-complex azo dyes characterized in that the sulfonated (X) and disulfonated (II) 1: 2 bromocomplexes consist of a monocode mixture 2M M = Na in the range of 0.50 to 0.80 moles 0.20 to 0.50 moles in a ratio of 1:11 = 0.05 to 0.95: 0.95 to 0.05.