CS267726B1 - Symmetrical 1 to 2 cobalt-complex sulphosubstituted azo-dyestuff and method of its preparation - Google Patents

Abstract

Symmetrical 1: 2 cobalt-complex sulfosubstituted azo dyes of formula I, where X and Υ Η, N0_, SO 2 H, Cl; + Z H, + SO, H; R is alkyl or H and Me NH 4, Na, H are prepared by coordination azo dyes of formula II, wherein each symbol has the meaning given with Co 'or Co' salts with addition of oxidants in an acidic to neutral environment.

Description

The invention relates to symmetrical 1: 2 cobalt-complex sulfosubstituted azo dyes of the formula I based on cobalt complexes.

/ 1 /

At \ 11

X and Y = H, NO ₂ , SO 2 H, Cl; Z = H, SO 2 and R = H, alkyl of 1 to 5 carbon atoms and process for their preparation. The dyes in question dye natural and synthetic polyamide materials, polyurethane materials and leather with highly stable green shades from weakly acidic to neutral dye baths. The dyes are characterized not only by high dyeing power, high cold solubility, excellent ductility and high color fastnesses, but also by good combinability and other dyes for wool assortments.

In recent years, a range of acid sulfosubstituted 1: 2 metal complex o, o-dihydroxy, o, o-aminohydroxy azo dyes, characterized by high stability, high solubility and universal use / dyeing and printing of wool and silk, polyamide and polyurethane fibers, or mixtures thereof; also for dyeing leather with the requirement of high abrasion resistance /,

In connection with the development of dyeing requiring continuous dyeing processes with high capacity utilization of the process, the requirement of highly concentrated baths is solved by increasing the solubility of dyes. By increasing the solubility of highly stable metal * complex azo dyes or solubilization by suitable substitution of ionic character. The condition for equalization of metal complex dyes. The quality of dyeing in achieving rich shades can also be achieved with dyes solubilized by ionic sulpho groups. The reduction in the equality of the dyeing and the elongation (by increasing the negative charge of the dye complex by this substitution) can be compensated by a suitable substitution topography using suitable textile auxiliaries.

All the above requirements in terms of required green shades, their combinability with other ranges of dyes for woolen materials and their application properties are met by the newly found symmetrical 1: 2 cobalt-complex sulfosubstituted dyes according to the invention of general formula I

/ 1 /

CS 267’726 B1 where X and ϊ = H, NO ,, SOjH, Cl; Z = H, SO 2 H and R = H, alkyl of 1 to 5 carbon atoms. Dyes which can be easily transported by relatively easy coordination of the azo dyes of the general formula in acidic and neutral environments with cobalt salts or cobalt salts without or with the addition of certain weaker oxidants (hydrogen peroxides, atmospheric oxygen, sulphites, hypochlorites or chlorites).

The examples below illustrate an embodiment of the preparation of the dyes according to the invention by designating the shade of the resulting dye.

Example l

0.01 mol of the appropriate aminophenol was dissolved in 10 ml of water and 5 ml HC1 / 10 M / zdiazotováno and 0.7 g _of NaN0 at room temperature. The reaction mixture was blunted with about 0.2 g of sulfamic acid and added to a prepared suspension of 0.01 mol of the corresponding 2-aminonaphthalene derivative with 15 ml of a 2.5 N solution (NH 4) 2 SO 4 heated to 50 ° C. After mixing the mixtures with the reactants, the resulting pH was adjusted to 3.0 to 3.5 with 10 N 1 SO 4 and the mixture was allowed to react for about 5 to 12 hours at 70 to 80 ° C. Then, the pH was adjusted to 4 to 8.5 with NH 4 OH. 0.005 mol of cobalt sulfate was added with 0.0005 mol of H 2 _O and the reaction mixture was heated at 85-90 ° C for 15-30 minutes. Drying of the reaction mixture gave the corresponding metal complex dye.

Example 2 already 10

In a manner similar to Example 1, with different combinations of X, Y and Z,

ready dyes with shade listed below table. Example X Y OF shade / wave / 2 6-S0 ₃ H 4-N0 ₂ 6-SOjH olive 3 H ’ 4-NO ,, 6-SO ₃ H olive 4 H 4-N0 ₂ 5-SO ₃ H olive 5 5-NO ₂ if 6-S0 ₃ H bluish green 6 5-N0 ₂ H 5-SO ₃ H bluish green 7 6-NO, 4-SOjH H dark green 8 6-SOjH 4-NO ,, H bluish green 9 6-S0 ₃ H 4-C1 H bluish green 10 H 4-S0 ₃ H H khaki

CS 267 <26 β]

Claims (2)

1. Symmetrical 1: 2 cobalt complex complex sulfosubstituted azo dye of general formula I, wherein Me = ΝΗ ,, XaT, H 4 ’ X and Ϊ = H, NO ₂ , SO ₃ H, Cl; Z = H, SO 2 H and R = H, alkyl of 1 to 5 carbon atoms. 2. Process for the preparation of a symmetrical cobalt complex azo dye according to point 1 by coordinating azo dyes of general formula II from ° R Á- N = N / 11 / with cobalt or cobalt salts in an acidic to neutral medium, characterized in that the coordination is carried out optionally with the addition of oxidants such as hydrogen peroxides, atmospheric oxygen, sulfites or chlorite.