CS270782B1 - Green 1: 2 chromocomplex azo dye - Google Patents

Abstract

The solution is a 1:2 chromocomplex azo dye with an olive green shade for dyeing wool and PAO. It consists of an unsymmetrical 1:2 chromium complex of the azo dye 2-aminophenol-4-methylsulfamide->· acetoacet- -o-chloranilide bound via the central chromium ion with the azo dye 2-hydroxy-6-nitro-4-naphthalenesulfonic acid-1-azo- 1 - -(2-hydroxynaphthalene).

Description

The invention relates to a green 1: 2 chromocomplex azo dye, for dyeing wool and PAD.

With the introduction of modern technologies for dyeing textile materials, the demands of the textile industry on the quality of dyes, especially on their solubility, have increased. This fact has forced the rapid development of 1: 2 metal complex dyes, the solubility of which is ensured by the presence of at least one sulpho group in the molecule. Dyes whose yellow component contains acetoacetanilide or acetoacet-o-chloroanilide as a passive component are currently used for brown-green shades, most often in combination with 4-nitro-2-aminophenol or 2-amino-4-nitrophenol-6-sulfoic acid. A common disadvantage of 1: 2 metal complex dyes with one sulio group, which have acetoacetanilide or acetoacet-o-chloroanilide incorporated in their molecule, is either lower water solubility or preparation problems requiring special technological procedures associated with the synthesis of the dye in organic solvents. Manufacturers often circumvent these disadvantages by formulating mixed brands, which, however, places higher demands on the raw material base.

It has now been found that the above disadvantages are eliminated by the green 1: 2 chromocomplex azo dye according to the invention, of the general formula

X

where R = H or -CH 2

X = H or -Cl and Me is an alkali metal or NH 2.

The advantages of the dye according to the invention lie in its high cold solubility (00 to 100 g / l) and in particular in the possibility of its preparation by the commonly used coordination chromination in an aqueous medium.

Example 1

Alkaline coupling suspension 0.109 mol of azo dye 2-aminophenol-4-methylsulfamide - * acetoacet-o-chloroanilide (V = 550 ml) is heated to 70 ° C and at this temperature an aqueous suspension of 56.5 g of a 1: 1 chromium complex of azo dye is added 2-Hydroxy-6-nitro-4-naphthalenesulfonic acid-1-azo-1- (2-hydroxynaphthalene) and the reaction mixture was heated to 90 ° C with stirring. It is maintained at this temperature for 1.5 to 2 hours. After drying, 158 g of a strong dye (λmax ⁼ 445 nm) are obtained, coloring the wool and PAD with an olive green tint.

Example 2 '

The alkaline coupling suspension containing 0.05 mol of the dye 2-aminophenol-4-sulfamide -> acetoacet-o-chloroanilide is heated to 70 DEG C. and an aqueous suspension of 27 g of a 1: 1 chromium complex is added as in Example 1 and heated to 90 ° C. After two hours of heating, the coordination chromium plating is complete. After drying, 61 g of dye (λ = 454 nm) are obtained, coloring the wool and PAD with an olive green tint. .

Example 3

The alkaline coupling suspension containing 0.05 mol of the dye 2-aminophenol-4-methylsulphonamide - acetoacetanilide is heated to 70 DEG C. and an aqueous suspension of 27 g of a 1: 1 chromium complex is added as in Example 1 and heated to 90 DEG C. ° C, the melting point is maintained for 2 h. After drying, 5 g of a strong dye (λ _max 447 nm) coloring the wool and PAD with an olive green tint are isolated.

Claims (1)

OBJECT OF THE INVENTION Green 1: 2 chromocomplex azo dye of the general formula wherein R = -H or -CH 2, X = -H or - Cl and Me is an alkali metal cation or ammonium group.