The method of obtaining colored containing cellulose textile materials

 

(57) Abstract:

Describes how to obtain colored containing cellulose textile materials by processing the source material of the dyeing solution containing leucoindigo, alkali and reducing agent, with subsequent fixation of the selected textile material of a dye by oxidation, washing and drying, which is that the use of leucoindigo, obtained by catalytic hydrogenation of Indigo, and added to the dye solution in the form of an aqueous-alkaline solution. Way better meet the requirements of environmental protection. 6 C.p. f-crystals, 1 table.

The invention relates to a process of dyeing containing cellulose textile materials, in particular to a method for producing dyed containing cellulose textile materials.

A method of obtaining colored containing cellulose textile materials by treatment of the source material containing leucoindigo dye solution in the presence of a mediator in an electrochemical conditions, fixation of selected textile material of the dye by oxidation with subsequent washing and drying of the painted material (see application WO 90/15182, D 06 P 1/22, 1990).

the definition by using the so-called mediators. Mediators represent a reversible redox system, which restores the dye, while they themselves are oxidized, and then re-established at the cathode and again are available for recovery of the dye. To recover the entire amount needed for dyeing Indigo necessary, however, huge charges and large surface electrodes. Furthermore, in the dye solution it is necessary to add a large number of conductive salt (about 1.5 g/l of sodium hydroxide, 30 g/l of sodium sulfate) to provide sufficient conductivity, in order to reduce ohmic losses and the required electrode surface. The consequence, however, is undesirable load of wastewater sulfate.

The closest creature to the invention is a method of obtaining a colored cellulose-containing materials processing of raw material dyeing solution containing the pre-restored Indigo in leucoindigo, as well as alkali and a reducing agent, with subsequent fixation of the dye oxidation, washing and drying (see N.In. Gordeeva and other VAT dyes in the textile industry.- M: Easy. ind, 1979. C. 106-109).

Sagalow, which meets the increasing requirements of environmental protection while maintaining the high quality characteristics of dyed textile materials.

The problem is solved by a method of obtaining colored containing cellulose textile materials by processing the source material of the dyeing solution containing leucoindigo, alkali and reducing agent, with subsequent fixation of the selected textile material of a dye by oxidation, washing and drying, due to the fact that they use leucoindigo, obtained by catalytic hydrogenation of Indigo, and added to the dye solution in the form of an aqueous-alkaline solution.

Preferably use a dye solution, to which is added 10-35% by weight, in particular 10 to 25% by weight, aqueous-alkaline solution of leucoindigo.

The content of alkali in aqueous-alkaline solution, in particular of sodium hydroxide, with a total of 2 to 10 wt.%, preferably 4-5 wt.%. If for dyeing preferably higher alkali content, by adding additional alkali in lacondeguy solution or dye solution, you can install the desired content.

The solubility of leucoindigo in these solutions very vasculat well-known way, in particular by restoring Indigo in alkaline paste, usually containing 10-35 wt.% Indigo and 2 to 10 wt.% of sodium hydroxide, using Raney Nickel as catalyst, under hydrogen pressure, in General equal to 2-4 bar, and the temperature in General is 60 - 90oC.

After further clarification received lacondeguy the appropriate solution without air and in the atmosphere of inert gas, preferably under a nitrogen pressure of approximately 0.1 bar, fill in the tanks. To reduce the possibility of undesirable oxidation by air, you can optionally add approximately 0.05 - 0.2 wt.% reductant and/or oxygen absorbent substance. As a suitable reducing agent, for example, dithionite sodium dioxide thiourea, derivatives sulfinol acid, and organic reducing agents.

The dyeing process can be done the usual dyeing using Indigo way, preferably is a continuous mode of operation.

Preparation of uterine cube disappears, instead only have gradually add lacondeguy solution in the dyeing solution. Only during the dyeing process small amounts restore the ear canals and on the surface of the dye solution of Indigo. The necessary number of hydrosulfite, however, significantly less than the amount of reducing agent required in the method prototype.

After extraction and air oxidation krashenyie you can finish, as usual, washing and drying.

In a particular implementation of the proposed method oxidized during dyeing as a result of contact with air in the air channels and on the surface of the dye solution share leucoindigo restore by electrochemical in the presence of neurotransmitter systems.

The electrodes may consist of conventional materials, such as, for example, stainless steel, titanium, lead, preferably, for example, copper.

Electrode potential is set at a level which prevents the formation of hydrogen at the cathode, but ensuring the regeneration of neurotransmitter systems, and the need to consider the strain when transferring electrons.

As a mediator suitable reversible organic or inorganic redox systems, the redox potential of which catogne needed to restore Indigo capacity equal to approximately 60 mV.

Work capacity is ectrode the upper limit operating voltage of about 1.1, so typically operate at a potential of 600 - 1100 mV.

Examples of suitable organic mediators are quinoid compounds such as anthracenesulfonic and hydroxyanthraquinone. Usually organic mediator used at a concentration of 0.5 to 10-3- 310-3preferably 1,510-3mol organic mediator/l of dye solution.

Examples of suitable inorganic mediators represent a complex salts of transition metals. Preferred system consisting of iron (II/III)/triethanolamine/sodium flaw in a weight ratio of about 1:8: 16 with the potential of up to about 980 mV. Typical concentration of 0.2 to 2, preferably 0.4 to 0.8 g of iron sulfate (II)/l dye solution.

A significant advantage of this implementation is the ability to work without additives environmentally negative conductive salt, such as sodium sulfate, due to the good electrical conductivity of the dye solution in use is obtained by hydrogenation leucoindigo solution. You only need a small amount of sodium clicking to establish optimal for dyeing pH.

In the table for comparison, the comparative is igraonice sodium;

30 g/l of sodium sulfate;

4 g/l of triethanolamine;

0.5 g/l sulfate heptahydrate iron (II);

2 g/l bramantyo;

b) 0 g/l sodium sulphate

and dyeing system (Ia - e) used in the proposed method, consisting of

1.4 g/l of sodium hydroxide;

4 g/l of triethanolamine;

0.5 g/l sulfate heptahydrate iron (II);

x g/l leucoindigo in the form of sodium salt.

Also without the use of sodium sulfate as the conductive salt in the painting system according to the invention, particularly preferred when the content of leucoindigo equal to 7 to 35 g/l (in particular preferred 8 - 15 g/l), there is sufficient conductivity > 11 MSSM-1.

If to carry out the method according to the prototype using the above dye system without the addition of sodium sulfate, the required voltage or surface electrodes, increased to triple the value at reduced current density. The consequence would be an increase in power consumption of up to triple the value.

As used previously restored Indigo, we need to restore only oxidized by contact with air at dyeing Indigo. The amount of contact with air depends on the design of dye set is the your centrifuging devices and short sections of the passage through the air.

Particularly preferred plants for dyeing width, in which a beam of yarn consisting of about 4000 threads (metric 12) evenly distributed over the working width. Of these facilities should be called, in particular, the installation type "Loopdye" "Loopdye"company "Looptex" (, Lugano/Switzerland), which uses only one trough to the dye solution with only a small amount, and only one wringer unit.

When using the installation type "Loopdye" to restore obtained by contact with air, Indigo usually required the addition of 40 g of 90% of dithionite sodium per minute (when processing 13 kg yarn/min and the content of the Indigo 2%). When using plants for dyeing width with the usual volume of dye bath is necessary additive of about 80 g 90% dithionite sodium per minute.

In terms of electrochemical equivalents, when applied pre-restored Indigo installation type "Loopdye required current total 821 And, as in the case of plants for dyeing width - just 1334 A.

In this implementation the proposed method of dyeing dyeing solution it is advisable served via a flow cell consisting of the us or monopolar, or sequentially. The surface of the electrodes must be such that when the maximum current density and operating capacity below capacity, the formation of molecular hydrogen has sufficient electrochemical reductive equivalents for regenerating leucoindigo.

Proposed method are brilliant in color, comparable with the colourings obtained from a conventional method of dyeing using Indigo, and the proposed method is significantly better for the environment.

Example 1. Continuous dyeing in the plant for dyeing width.

Yarn: cotton yarn

The linear density of yarn: metric number 12 (12 km/kg of yarn)

Number of threads: 4080

Speed: 35 m/min

The number used Indigo: 2% (calculated on the weight of the yarn)

The number of processed yarn: 11.7 kg/min

Length of party: 23 000 m

The volume of dye solution: 1 500 l

Dye solution (1500 l; 7 g/l leucoindigo) prepared by mixing 1200 l of water with 3 l of sodium silk degrees Baumé 38o3 kg of dithionite sodium (about 90%) and 52,5 kg to 20 wt.%-aqueous leucoindigo solution containing sodium hydroxide, equal to 4.8 wt.% is sulfit.

After dyeing, the yarn is washed and dried in the usual way.

Hue, fastness to various influences and appearance of the fabric finished parts after washing to meet the standard.

When the rinsing water consumption equal to 3000 l/h, in the wastewater obtain the concentration of sulfate equal to 1.5 g/L.

Example 2. Continuous dyeing in the plant for dyeing cables.

Yarn: cotton yarn

The linear density of yarn: metric number 12 (12 km/kg of yarn)

Number of threads: 8160 (24 kabalci, each with 340-thread)

The linear density of yarn: metric number 12 (12 km/kg of yarn)

Number of threads: 8160 (24 kabalci, each with 340-thread)

Speed: 25 m/min

The number used Indigo: 2% (calculated on the weight of the yarn)

The number of processed yarn: 17 kg/min

Length of party: 12 000 m

The volume of dye solution: 24 000 l

Dye solution (24000 l; 2 g/l leucoindigo) prepared by mixing 20 000 l of water with 36 l of sodium silk degrees Baumé 38o, 36 kg of dithionite sodium (about 90%) and 240 kg leucoindigo solution of example 1.

During dyeing consumption metered add lacondeguy solution, natchanok, the fastness to various influences, and the appearance of the fabric finished parts after washing to meet the standard.

When the rinsing water consumption equal to 9000 l/h, in the wastewater are concentrations of sulfate, equal to 1.6 g/L.

1. The method of obtaining colored containing cellulose textile materials by processing the source material of the dyeing solution containing leucoindigo, alkali and reducing agent, with subsequent fixation of the selected textile material of a dye by oxidation, washing and drying, characterized in that use leucoindigo, obtained by catalytic hydrogenation of Indigo and added to the dye solution in the form of an aqueous-alkaline solution.

2. The method according to p. 1, characterized in that the use of dye solution, to which was added 10 to 35% by weight of an aqueous-alkaline solution of leucoindigo.

3. The method according to p. 1 or 2, characterized in that the use of dye solution, to which was added an aqueous-alkaline solution of leucoindigo with the alkali content of 2 to 10 wt.%.

4. The method according to PP. 1 to 3, characterized in that the use of dye solution, to which was added an aqueous-alkaline solution of leucoindigo with the content of the hydroxide form employed in the electrochemical conditions of the mediator.

6. The method according to p. 5, characterized in that as the mediator use complex compounds containing transition metals.

7. The method according to p. 5, characterized in that as a mediator using organic redox systems, which in terms of processing reversible.

Priority PP.1 - 4 from 30.03.93.

Priority PP.5 - 7 - from 12.05.93.

 

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