Dyeing liquor and dyeing method for reducing indigo blue through indirect electrochemistry of single solute

A dyeing method and electrochemical technology, applied in dyeing, textile and papermaking, etc., can solve the problems of low electron transfer efficiency, high energy consumption, low dyeing efficiency, etc., to speed up electrochemical reduction rate, improve current efficiency, ensure The effect of dyeing quality

Inactive Publication Date: 2018-10-30
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a dye solution and a dyeing method for indirect electrochemical reduction of indigo by solutes, aiming to solve the problems of low dyeing efficiency and energy loss caused by the low electron transfer efficiency between indigo and electrode surface in the electrochemical reduction indigo dye solution in the prior art. high consumption

Method used

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  • Dyeing liquor and dyeing method for reducing indigo blue through indirect electrochemistry of single solute

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of method that uses the dye liquor of single solute indirect electrochemical reduction indigo to carry out dyeing, it comprises the steps:

[0022] The dyeing solution is placed in the electrolytic tank, the dyeing solution contains 0.01mol / L sodium hydroxide, 0.02mol / L 1,8-dihydroxyanthraquinone and 0.01mol / L indigo dye, the cathode is 20 mesh copper mesh, and the anode is 20 Stainless steel mesh, the electrolytic reduction temperature is 60°C, the electrolytic current density is 0.08 ampere / square decimeter, and the electrolytic solution is completely reduced to the reducing solution, and the reducing solution is introduced into the dyeing tank through the first pumping pump to dye the yarn. The dyeing process During every 20 minutes, the 1 / 2 volume part of the oxidized dye solution is pumped back into the electrolytic cell by the second suction pump, and the part of the oxidized reducing solution is electrochemically reduced in the electrolytic cell to realize ...

Embodiment 2

[0024] A kind of method that uses the dye liquor of single solute indirect electrochemical reduction indigo to carry out dyeing, it comprises the steps:

[0025] The dyeing solution is placed in the electrolytic tank, the dyeing solution contains 0.1mol / L sodium hydroxide, 0.05mol / L 2,6-dihydroxyanthraquinone, 0.03mol / L indigo dye, the cathode is 80 mesh stainless steel mesh, and the anode is 80 Nickel mesh, the electrolytic reduction temperature is 45°C, the electrolytic current density is 0.5 ampere / square decimeter, and the electrolyte is completely reduced to the reducing solution, and the reducing solution is introduced into the dyeing tank through the first pumping pump to dye the yarn. The dyeing process During every 20 minutes, the 1 / 2 volume part of the oxidized dye solution is pumped back into the electrolytic cell by the second suction pump, and the part of the oxidized reducing solution is electrochemically reduced in the electrolytic cell to realize reduction and ...

Embodiment 3

[0027] A kind of method that uses the dye liquor of single solute indirect electrochemical reduction indigo to carry out dyeing, it comprises the steps:

[0028] The dye solution is placed in an electrolytic tank, the dye solution contains 0.05mol / L sodium hydroxide, 0.002mol / L 2,6-dihydroxyanthraquinone, 0.01mol / L indigo dye, the cathode is a stainless steel sheet, and the anode is a copper sheet. The electrolytic reduction temperature is 40°C, the electrolytic current density is 2 amps / dm2, and when the electrolyte is completely reduced to a reducing solution, the reducing solution is introduced into the dyeing tank through the first pumping pump to dye the yarn. During the dyeing process, every After 20 minutes, 1 / 2 of the volume of the oxidized dye solution is pumped back to the electrolytic tank by the second pump, and the part of the oxidized reducing solution is electrochemically reduced in the electrolytic tank to realize reduction and inter-dyeing dye solution cycle, ...

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Abstract

The invention relates to dyeing liquor and a dyeing method for reducing indigo blue through indirect electrochemistry of a single solute. The dyeing liquor takes water as a solvent and is prepared from the following raw materials at concentrations: strong base at 0.01 to 0.1 mol/L, an electron transfer promoter at 0.001 to 0.1 mol/L and an indigo blue dye at 0.01 to 0.1 mol/L. The dyeing method comprises the following steps: firstly, completely reducing the dyeing liquor in an electrolytic tank, then transferring the dyeing liquor into a dyeing tank, dyeing yarn, pumping part of oxidized dyeing liquor back into the electrolytic tank in the dyeing process, then reducing the dyeing liquor, pumping the reduced dyeing liquor into the dyeing tank to dye the yarn, continuously performing the dyeing, and pumping back the oxidized part of the dyeing liquor for reducing and reuse. The dyeing liquor has the beneficial effects that dioxyanthraquinone is used as the electron transfer promoter, sothat the electrochemical reducing rate is effectively increased, and the current efficiency is improved; after the electron transfer promoter is added, the indigo blue can be reduced in the alkaline solution at a relatively low concentration, so that the chemical consumption is reduced, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of vat dyeing of indigo dye, and in particular relates to a dye solution and a dyeing method for indirect electrochemical reduction of indigo with single solute. Background technique [0002] Indigo is one of the oldest known dyes. The consumption of dye was enormous due to the popularity of blue jeans, which were dyed with indigo. The consumption of indigo and other vat dyes reaches about 33 million kg per year. Indigo can be used in the dyeing process, but needs to be reduced to its water-soluble leuco form. Its reduced form has a high affinity for cellulose fibers and is thus readily absorbed into the fibers, where it remains when it is reoxidized back to its blue insoluble form. Industrial reduction is performed with sodium dithionite because the formation of by-product wastes such as sulfites, sulphates and sulfur poses an environmental problem. Therefore, the existence of alternatives to sodium dithionite fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/22D06P1/651
CPCD06P1/228D06P1/65118
Inventor 熊伟谭晓冬徐杰易长海
Owner WUHAN TEXTILE UNIV
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