Method of dyeing silk or mix it with cotton

 

(57) Abstract:

The inventive dyeing silk or mix it with cotton carried out without the use of an electrolyte in the presence of maleic or citric acid. The method provides a complete setting the dye. Working time dyeing is reduced to 35 - 60 minutes Method can be used when dyeing viscose, staple, and other textile materials.

The invention relates to dyeing and finishing production, in particular to a method of dyeing silk or mix it with cotton with direct dyes without the use of the electrolyte.

It is known that the dyeing of silk of direct dyes is carried out in a neutral, alkaline or acidic environment, and cotton fabrics in a neutral or alkaline medium in the presence of an electrolyte, NaCl, Na2SO4in the amount of 10 to 40 g/l (1).

Dyeing silk or mix it with cotton is carried out by impregnation with an aqueous solution of a direct dye in the presence of 3 to 6 wt. acetic acid and 5 to 10 wt. inorganic salts, such as sodium chloride as electrolyte at a temperature of about 30oC for 15 to 20 minutes, followed by nagrevateli known methods are uneven and insufficient colour intensity as well as the duration of dyeing.

It is also known that the dyeing of silk of direct dyes is carried out in the presence of organic acid - hexamethylenediaminetetra or trimethylpentanediol and electrolyte - aluminium sulfate contributing to the intensity and evenness of color, as well as to improve the color fastness to physico-mechanical stress (3). At the end of dyeing by any known method the fabric is washed with cold, then warm (45 55oC) water and fixed with a solution containing 3 g/l of the drug DCU or DCM, or 0.5 g/l of drug Resistant-2 and 0.5 g/l of 60% acetic acid at 60 70oC.

The present invention provides for the use as organic maleic acid or citric acid, to facilitate the process without the use of the electrolyte.

The following examples explain but not limit the present invention.

Example 1. The dye solution is prepared by adding 0.5 hours acid in an aqueous solution of a direct dye. Another part of the acid added to the dyeing bath at 25 30oC. the Dyeing of silk are known manner with ptx2">

Example 2. Dyeing is carried out in the conditions of example 1, but using an aqueous composition containing a Direct turquoise heavy-duty 1 Mac. Direct yellow To 0.1 wt. and citric acid 0,9 1,0 wt.

To obtain a high color fastness of silk and other textiles after washing for 15 to 20 min it is treated with 0.25 to 0.35 g/l of a carboxylic acid in 65 70oC.

The dyeing of textile materials by a specified method provides full setting the dye.

Working time dyeing is reduced to 35 60 minutes

The method can be applied in the dyeing of viscose, staple, and other textile materials.

Method of dyeing silk or mix it with cotton by impregnation with an aqueous solution of a direct dye in the presence of organic acids, wherein the organic acid is used maleic or citric acid.

 

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