RU2049838C1 - Two-phase method of suspension dyeing of cellulose-containing textile material - Google Patents

Abstract

FIELD: textile industry. SUBSTANCE: preparation on the base of aqueous-alkali solution of sodium oxymethyl sulfinate, hydroxyethylidene diphosphoric acid and sodium silicate or preparation on the base of sodium oxymethyl sulfinate, oxy- and hydroxyethylidene diphosphoric acid, sodium carbonate and carboxymethyl cellulose or their mixture are used as reducing agent during dyeing. Quantity of said agent is 30-150 g/l. Impregnation is carried out by alkali-reducing composition at temperature not higher 70 C. EFFECT: decreases prematurity of reduction of dye, decreases losses of dye. 3 tbl

Description

 The invention relates to the dyeing of cellulose-containing textile material with vat dyes, which are widely used for continuous and batch processes due to the fact that they provide very high strength dyes in a wide range of colors and shades.

 The known two-phase method of suspension dyeing with vat dyes [1] It is based on applying the dye to the fiber in unreduced form and converting it into the sodium salt of the leuko compound directly in the fiber. Although the method makes it possible to obtain colors of any intensity from light to dark, but in industrial practice it is used exclusively to obtain dark colors.

 The method is implemented as follows.

Impregnation of the fabric with a dye suspension containing, g / l: Dye D 5-50
Nonionic wetting agent 1-2
Dispersant (sulfo-olein SC) 4-5
Impregnation temperature not higher than 40 ^о С
Spin.

Drying at temperatures above 100 ° ^C.

Impregnation with an alkaline reduction solution containing, g / l: Sodium hydrosulfate 20-100
Sodium hydroxide (32%) 20-120 Sodium chloride 5-25
The impregnation of the fabric alkaline reducing solution is carried out at 20-25 ^{° C} (the jacket proyavitelnoy padding continuously supplied cold water) in order to prevent premature decomposition of sodium hydrosulfite.

 The content of alkali, hydrosulfite and electrolyte is determined depending on the concentration of the dye in the suspension and its amount deposited on the fabric.

Spin 60-110%
Steaming in an atmosphere of saturated water vapor for 30-60 s.

 Oxidation in the air goggles and in the first two wash baths with cold water.

 Rinsing with warm water, hot in the presence of TMS (soap), warm and cold water.

 Having undoubted advantages, this method also has the disadvantage of instability of the hydrosulfite solution. In addition, the degree of useful use of the dye is only 75-85%. Most of the loss of the dye is associated with its descent from the fabric when it is impregnated in a development bath, since it undergoes a hydrosulfite transition to a soluble state even at room temperature.

 Attempts are known to increase the degree of useful use of the dye through the use of various reducing agents, for example, a mixture of hydrosulfite with thiourea dioxide. However, thiourea begins to restore the dye already in the alkaline reduction bath, so the dye is also inevitable. In addition, the industrial production of thiourea dioxide in quantities sufficient for the operation of textile enterprises has not been established [2] Using a mixture of hydrosulfite with rongalite as a reducing agent also does not solve the problem of increasing the degree of useful use of dye, since it takes several minutes to recover vat dyes with rongalite, which significantly exceeds the usual technological time of steaming on modern lines of suspension dyeing. It is possible to reduce the recovery time of the dye with rongalite using special catalysts [3] up to 45-60 s, which will already correspond to the time provided for by the technological characteristics of the equipment. However, catalysts for rongalite are still not commercially available.

 Thus, despite the significant number of known variants of the two-phase suspension method of dyeing with vat dyes, no solution has been found to date that allows to increase the useful use of the dye with a minimum consumption of reducing agent.

 The purpose of the invention is to find a two-phase suspension method for dyeing cellulose-containing material with vat dyes, which allows to increase the degree of useful use of the dye by reducing its loss due to premature reduction in the developing bath, while reducing the consumption of reducing agent.

This problem was solved by a two-phase method of suspension dyeing, including impregnation of the material with a slurry of a bottoms dye, extraction, drying, impregnation with an alkaline reduction solution containing sodium hydroxide, a reducing agent, sodium chloride and water, extraction, steaming, oxidation and washing, in which according to the invention the impregnation alkaline reducing solution is carried out at heating to a temperature not higher than 70 ° ^C, the reducing agent used in an amount of 30-150 g / l, and used as reducing agent taken alone or in mixture Dru other medications "Ronteks" and "Roncoli" representing the composition based on sodium formaldehyde sulfoxylate, etilidendifosfonovoy acid derivative and an alkali agent.

The drug "Rontex" (TU 6-36-5744684-36-90) has a composition, wt. Rongalit 100% 22-25 Caustic soda 100% 7-9
Hydroxyethylidene diphosphonic acid 0.8-0.9 Sodium silicate 4.1-4.7 Water Up to 100
The drug "Roncol" has a composition, wt. Rongalit 100% 27-30
Hydroxy or hydroxy
ethylidene diphosphonic acid 1.0-1.2 Sodium carbonate 6.0-7.0 Carboxymethyl cellulose 2.0-2.5 Water Up to 100
The drug "Roncol" is prepared as follows.

The enameled steel unit equipped with a stirrer was charged with a solution of Rongalit, the remaining components were added and stirred for 90-120 min on heating from 20 to 50-55 ^C. The mixture was then fed to the evaporation to a desired concentration of Rongalit. Evaporation is carried out at 55-60 ^{° C} under vacuum of 0.8-0.9 kgf / cm ² under constant agitation. Evaporation control is carried out by the amount of distilled water in the receiver, which is determined by calculation, depending on the initial concentration of rongalite.

 When using a mixture of "Rontex" and "Roncol" in a container containing a certain amount of water and alkali, add both drugs and mix. Drugs can be used in any ratio.

As a reducing agent in the known method using hydrosulfite, which contains in final form 82% of the active substance. The amount of active substance in "Rontex" and "Roncol" is 25 and 29%, respectively. When converted to 100% active substance, its consumption in the known method and claimed will be at a dye concentration in suspension (g / l)
5 g / l 50 g / l for hydrosulfite 16.4 82.0 for Rontex 7.5 37.5 for Roncol 8.7 43.5
Thus, the consumption of the active substance in the claimed method is 1.9-2.2 times lower than in the known method.

The method can be implemented for dyeing various cellulose-containing textile materials (yarn, fabric). Cube dyes of various chemical nature can be used to obtain frontal colors and intensities from light to dark shades. The invention is implemented as follows. The material is impregnated with a composition containing, as in the known methods, a vat dye, a nonionic type wetting agent and a substance having dispersing properties, for example, an NF type dispersant or SK sulfolein or NB wetting agent. The impregnation is carried out by heating, but not above 40 ^C. The cake material is dried at a temperature not higher than 100 ^{° C,} then impregnated with an alkaline reducing solution containing sodium hydroxide (32%) and sodium chloride in concentrations conventionally employed in similar technologies, as well as a reducing agent, which is used as "Rontex" or "Roncol" or a mixture thereof in any ratio. Impregnating under heating, but not higher than 70 ° ^C. The filter material zaparivayut in a medium of saturated steam, and then oxidized by known methods, namely, first in air and then in cold running water, adding hydrogen peroxide and if necessary acetic acid. Then the material is washed according to the technology generally accepted for vat dyes.

 The relative color intensity of the samples was determined by the Kubelka-Munk formula, the dye content on the fiber by the method of sulfuric acid sols, the color fastness to dry friction and wet wiping according to standard methods.

 In the table. 1-3 show the results of dyeing according to the invention for various dyes under various conditions.

 In examples 1, 5, 9, 13, 15, 17, 19, 21, 23, the results of dyeing by the prototype method under comparable conditions are shown for comparison.

Claims (1)

TWO-PHASE METHOD OF SUSPENSION DYEING OF CELLULOSE-CONTAINING TEXTILE MATERIAL by impregnation of suspensions of distillation dye followed by pressing, drying, impregnation with an alkali-reducing composition containing caustic soda, a reducing agent, sodium chloride, washing, water, water, sodium chloride, water and other reducing agent use the drug "Rontex" based on an aqueous-alkaline solution of sodium oxymethyl sulfinate, hydroxyethylidene diphosphonic acid and sodium silicate, or prep rats based on sodium oxymethyl sulfyanate, hydroxyethylidene diphosphonic acid, sodium carbonate and carboxymethyl cellulose, or a mixture thereof in an amount of 30-150 g / l, and the alkali-impregnating composition is impregnated at a temperature not exceeding 70 ^o C.

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