DE2009500A1 - Azo dyes for dyeing polyester fabric contin - yellow and orange - Google Patents

Abstract

Azo dyes for dyeing polyesters continuously yellow and orange. Dyes D-N=N-A (I) (where D is 3-Cl-C6H4-N;N-(1-CH3)-C6H3, 4-HO-C6H4-N=N-C6H4-, 4-CH3O-C6H4-N=N-(3-CH3)-(6-OCH3)-C6H2-, 4-Cl-C6H4-N=N-(2,6-(CH3)2 C6H2-, C6H5-N=N-C6H5-, 1-(CH3)-C6H4-N=N-(2-CH3)C6H4-, 4-(CH3)2N-SO2-C6H4-N=N-(3-CH3)C6H3- or C6H5-N=N-(3:6)(OCH3)2-C6H2-, and A is 3,5-diphenyl-4-hyroxy-; 1-hydroxy-4-t-butyl; 3-chloro-4-hydroxy-; 3-methyl-4-hydroxy; 2,6-dimethyl-4-hydroxy; 3,5-dimethyl-4-chloro-; 2-hydroxy-5-methyl, or 3,5-dimethyl-4-hydroxyphenyl) are used for continuously dyeing polyesters in solvents, pref. trichlorethylene. Yellow to orange and light brown shades are obtained. Operation reliability is high and speck formation by dye pptn. is prevented.

Description

Process for the continuous dyeing of textile material made of polyesters in solvents The invention relates to a process for the continuous dyeing of textile material made of polyesters in solvents, which is characterized in that dyes of the general formula D-NsN-A are used, in which D is a radical of the formula and A is a radical of the formula mean.

Polyesters that can be dyed using the continuous process, are, for example, polyethylene glycol terephthalate or products with an analogous chemical structure. Suitable solvents for the new process are e.g. chlorinated hydrocarbons, like 1.1.1-trichloroethane, perchlorethylene or trichlorethylene.

The solvents can also be used as a mixture and with additions of solubilizers for the dyes such as methanol, ethanol, dimethylformamide or N-methylpyrrolidone, can be used, however, the use of pure solvents and in particular preferred by trichlorethylene.

The new dyeing process is expediently carried out so that the dye or a mixture of dyes is dissolved at room or elevated temperature and impregnating the textile material with the solution. Then the dye fixed by the usual methods, with intermediate drying also switched on can be.

The impregnation of the textile material with the dye solution can e.g. by a dipping process, by spraying or by padding. Most of the solvent is then expediently in the hot air stream removed from the goods and the dye in a known manner by steaming with water or Solvent vapor, preferably under pressure at 150 ° C, or by dry heat treatment with Hot air, contact heat, treatment with a high frequency field or irradiation with Infrared fixed. Drying between the impregnation and the fixing stage can be carried out can then be avoided if the goods are immediately put into one after impregnation Damper retracts.

In contrast to the aqueous dye dispersions in the conventional Working method, solvent liquors represent real solutions of the dye in question in the solvent. Wetting, dispersing and softening agents are naturally not required, so that the whole staining system is considerably simplified. The risk of speck formation due to dye precipitation is excluded or is at least considerably restricted. This ensures a high level of operational reliability.

A considerable simplification can also be achieved with the finish of the dyes take place. It is not only possible to use the dyes in the form of dried presscakes to use, but you can also add all kinds of thickening agents to the dye. The following can be used as thickening agents: Salts of all kinds, inorganic polymers (e.g. Silica gel), carbohydrates such as sugar, starch, dextrin etc.

or organic polymers, insofar as these substances are in the solvent are insoluble. The grain size of the dyes is not one, as is the case with dispersions critical size, so that the lengthy grinding processes can also be shortened considerably can.

The use of thickening agents which are soluble in the solvent, e.g. Polyvinyl esters, such as polyacrylic acid ethyl ester, are possible.

Salche products can, for example, be rewashed with solvents, for example after heat setting, together with the unfixed dye can be removed from the goods again4 Almonds can be used to make the dye liquor Dyestuff with stirring at room temperature or optionally with heating in the Dissolve solvent. One can also proceed in such a way that one is in a heatable batch container the liquor circulates through a filter at temperatures between 0 ° and 600 ° C. After adding the dye, it settles on the filter and becomes more and dissolved down according to its solubility.

The above-mentioned adjusting agents, which are not soluble in the solvent, remain on the filter. The liquor can also be circulated via the padder chassis done so that one always works with a "bare fleet."

To avoid dye migration during intermediate drying the liquor can also be thickeners which are soluble in the solvent, such as polyvinyl esters or add cellulose ester.

Example 1 5.0 g of the dye of the formula are dissolved in 1000 ml of trichlorethylene with stirring. Fabric made of polyethylene glycol terephthalate is impregnated with the filtered clear dye solution at room temperature, the impregnated fabric is squeezed to about 200% of its dry weight and dried at 40 to 80 ° C. in a stream of air. The dye is then fixed by thermosoling (2 minutes at 210 ° C). An orange-yellow dyeing with good lightfastness and good sublimation fastness is obtained.

Example 2 5.0 g of the dye of the formula are dissolved in 1000 ml of trichlorethylene with stirring. 30 g of a 20% polyethyl acrylate thickener in trichlorethylene are added to the dye solution obtained. The dye solution clarified by filtration is used to impregnate fabric made of polyethylene glycol terephthalate at room temperature, and the impregnated fabric is squeezed to about 200; its dry weight and it is dried at 40 to 80 ° C. in a stream of air. The dye is then fixed by thermosoling (2 minutes at 210 ° C.). An orange dyeing with good fastness to light and good fastness to sublimation is obtained.

Similarly good dyeing results are obtained when impregnated and dried fabrics are not heat-set, but at 1300C for 10 minutes steamed under pressure, is used instead of the dye mentioned in Example 1 one of the dyes given in the table below is also obtained well developed dyeings with good to very good light and sublimation fastness properties.

Example dye shade on polyester orange yellow yellow -6 example dye shade on polyester C1 6 CH30 e N = N t N = N- t OH yellow 6 CH30 N = NN3 = OH yellow 3 7 N = NN = N3Cl yellow tH3 Cl 8 C1- tN = Ns 2 N = N OH yellow & -9 z / 9 G1 4 N = NbN = N 9 OH yellow C1 10 5 N = N oN zuN + H light brown off3 N = NN = FH, yellow 1t $ N = N t - N = N t OH yellow 3 Cfi3 CH CH3 9d N = NN3 = yellow Example dye shade on polyester CH GHt 13 C1 e N = = N + N - N 4 OH yellow 14 5 N NN = -OEP yellow C6H5 OH 15 (cm3) 2 N - O2S - N = HN = yellow 3 CH3 Ig ci M = MI8-N = N CffQ, 16 c = N = N = N <0E yellow CH3 CH3 OCH3 17 to N = N ß N = No 0H orange OC}

Claims (2)

Claims 1. A process for the continuous dyeing of textile material made of polyesters in solvents, characterized in that dyes of the general formula DN: NA are used, in which D is a radical of the formula and A is a radical of the formula mean. 2. The method according to claim 1 »characterized in that trichlorethylene used as a solvent.