US20050028291A1 - Changing the color or dyed textile substrates - Google Patents

Changing the color or dyed textile substrates Download PDF

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Publication number
US20050028291A1
US20050028291A1 US10/498,161 US49816104A US2005028291A1 US 20050028291 A1 US20050028291 A1 US 20050028291A1 US 49816104 A US49816104 A US 49816104A US 2005028291 A1 US2005028291 A1 US 2005028291A1
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generated
inorganic
redox
metal
reducing
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Thomas Bechtold
Wolfgang Schrott
Peter Maier
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Dystar Textilfarben GmbH and Co Deutschland KG
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Dystar Textilfarben GmbH and Co Deutschland KG
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Publication of US20050028291A1 publication Critical patent/US20050028291A1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/13—Fugitive dyeing or stripping dyes
    • D06P5/134—Fugitive dyeing or stripping dyes with reductants
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/13—Fugitive dyeing or stripping dyes
    • D06P5/132—Fugitive dyeing or stripping dyes with oxidants
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/15—Locally discharging the dyes
    • D06P5/153—Locally discharging the dyes with oxidants
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/15—Locally discharging the dyes
    • D06P5/155—Locally discharging the dyes with reductants
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/20—Physical treatments affecting dyeing, e.g. ultrasonic or electric
    • D06P5/2016—Application of electric energy

Definitions

  • the present invention relates to a process for changing the color of dyed textile substrates by the action of reducing or oxidizing agents which are electrochemically generated in aqueous solution.
  • Bleaching is of fundamental importance in the manufacture of textile products, its original function being to destroy the natural colored constituents of the fibrous materials prior to the dyeing operation.
  • Reductive bleaching processes are employed on azo dyes in a wide variety of process stages.
  • the discharging of a dye is normally based on the reductive destruction of azo dyes by the local application of reducing agents (formaldehydesulfoxylates).
  • reducing agents formaldehydesulfoxylates
  • off-shade dyeings are stripped off again, ie decolorized, by means of suitable reducing agents (sodium dithionite), so that the textile material may be redyed.
  • suitable reducing agents sodium dithionite
  • iron-triethanolamine complexes can be used as regenerable reducing agents for dyeing vat dyes, sulfur dyes and indigo and also for decolorizing azo dyes.
  • other complexing agents such as gluconic acid, hydroxyethylenediaminetriacetic acid, etc. are suitable as well.
  • hypochlorite has already been investigated at length, the publications in this field focusing on the generation of hypochlorite-containing solutions for subsequent use in bleaching operations (Rengaranjan et al., India. bull. Electrochem. 1993 9(11-12) 642-643 and Tong C., CN88101765). Similarly, the anodic generation of hypochlorite has also been described for textile washing and bleaching (see EP 0 002423 A1).
  • the present invention provides a process for obtaining color changes on dyed textile substrates by treating the dyed textile substrates with an electrochemically generated aqueous solution of reducing or oxidizing agents, which comprises controlling the cell current in such a way that the solution, when in contact with the dyed textile substrate, has a suitable redox potential to obtain the color change.
  • color changes are especially lightenings, hue shifts and deliberate unlevelnesses (microscopic or macroscopic).
  • the reducing or oxidizing agents required to obtain the desired color changes are electrochemically generated according to the process of the invention, customarily in an electrolytic cell or an apparatus which can perform the functions of an electrolytic cell.
  • a suitable redox system or redox couple is introduced into the cell and the reducing or oxidizing agent is generated therefrom by electrochemical means.
  • Suitable electrolytic cells will be known to one skilled in the art. They are generally made up of a working electrode, a counterelectrode and also power feed and power supply. Where appropriate, the cell contains a membrane to divide the anode and cathode spaces; but, depending on the redox system used, it is also possible to use a simpler and less costly undivided form of the cell.
  • Particularly suitable electrolytic cells have a large active electrode area and accordingly preference is given not only to planar electrodes, for example in the form of plates, but also to three-dimensional electrodes (foraminous sheets, wire cloths, webs, felts, flowing electrodes, shaking electrodes, porous sintered plates), particular preference being given to multicathode systems.
  • planar electrodes for example in the form of plates
  • three-dimensional electrodes foraminous sheets, wire cloths, webs, felts, flowing electrodes, shaking electrodes, porous sintered plates
  • Suitable electrode materials are known to one skilled in the art and are to be selected according to the requirements, particular preference being given to noble metals, stainless steel, graphite and carbon and also titanium sheet coated with noble metal oxide.
  • the electrolytic cell is constructed as a flowthrough cell which communicates directly with a treatment assembly into which the aqueous solution containing the reducing or oxidizing agent (treatment liquor) is pumped and in which the color change on the textile material is generated.
  • the solution can subsequently be returned back into the electrolytic cell for regeneration. There is no continuous loading and unloading of the machine for preparatory rinses or a wash after the electrochemical treatment step.
  • Useful treatment assemblies include the apparatuses customary for wet processing or washing textiles. Suitable are in particular textile machines, such as a yarn dyeing machine, jigger, jet dyeing machine or continuous machine.
  • textile machines such as a yarn dyeing machine, jigger, jet dyeing machine or continuous machine.
  • the treatment of textiles in tube form is carried out for example in overflow machines or jet dyeing machines, the treatment of piece goods takes place on beam dyeing machines and the treatment of fully made-up garments on fully-fashioned machines or drum dyeing machines.
  • the electrolytic cell is directly configured as a treatment assembly, or parts of the treatment assembly act as electrodes, so that electrolyte circulation between electrolytic cell and treatment assembly is obviated.
  • the electrodes can in this way be disposed in the direct vicinity of the textile material, so that locally confined dye change can be achieved.
  • the geometry of the electrodes depends on the desired result. If the electrode generating the reducing or oxidizing agent is for example pressed in the form of a stamp onto the textile which contains electrolyte or is in the treatment bath, a patternwise color change can be obtained after the current has been switched on. In another variant according to the invention, fully made-up parts, for example trousers, are pulled over electroconductive supports of appropriate shape, which act as electrodes, and subjected to the process according to the invention.
  • the dyed textile material is subjected to mechanical and/or hydrodynamic treatment at the same time as being subjected to the action of the reducing or oxidizing agent.
  • This is accomplished for example by stirring or recirculating in the treatment apparatus.
  • the mechanical treatment is accomplished for example by agitating the textile material in the rotating drum, whereas in the case of the treatment of dyed textile material in rope form or open width a mechanical treatment can be effected for example by squeeze systems, rolls or rollers, for example immersion squeeze systems etc.
  • any mechanical treatment required can also be effected by adding abrasive materials to the treatment liquor.
  • Useful abrasive materials include for example pumice, suitable plastics or metals.
  • a mechanical treatment at a microscopic level can be effected by adding suitable abrasive powders, for example abradant or metal powder.
  • a mechanical treatment can also have coupled to it a hydrodynamic treatment, for example in a squeeze system, in a drum washer, during the treatment in a jet dyeing machine or overflow dyeing machine.
  • a specific hydrodynamic stress can also be caused by an intensive liquor flow (spray tubes, aspirating, sieve drum washer) or for example by vibration or ultrasound.
  • a suitable redox potential in the solution in immediate neighborhood to the dyed textile substrate is the setting of a suitable redox potential in the solution in immediate neighborhood to the dyed textile substrate.
  • the redox potential need not be mandatorily kept constant at one value, it is also possible for defined different redox potential levels to follow each other.
  • a person skilled in the art is easily able to determine the necessary redox potential for the desired color change by simple experimentation for a system which otherwise remains the same.
  • the redox potential of the treatment solution can be measured with a redox electrode, for example a Pt combination electrode with Ag/AgCl 3 M KCl reference electrode.
  • the redox potential in the treatment liquor may preferably be measured and controlled by a measurement of the rest potential, in which case the working electrode also serves as the measuring electrode and the electrolytic current is interrupted for the period of the potential measurement.
  • the reference electrode required can be installed alongside the working electrodes, since the potential measurement is only carried out during the currentless period of the working electrode. The time required to measure the potential must be determined in preliminary tests, since, once the current has been switched off, a minimum time period is necessary to allow the working electrode to adapt to the solution potential.
  • the redox potential is preferably measured in the treatment apparatus, more preferably in the immediate vicinity of the dyed textile substrate.
  • the redox potentials needed vary with the dye and the general conditions, but preferably range from +100 to +2000 mV and more preferably from +400 to +1600 mV in the case of oxidations and preferably from ⁇ 300 to ⁇ 1800 mV and more preferably from ⁇ 400 to ⁇ 1200 mV in the case of reductions.
  • the necessary potentials are set by controlling the cell current, current densities generally being in the range from 0.1 mA/cm 2 to 1 A/cm 2 and preferably in the range from 1 mA/cm 2 to 0.1 A/cm 2 .
  • the process of the invention can be carried out with reducing or oxidizing agents.
  • Reducing agents are generated cathodically and oxidizing agents anodically from reversible redox systems.
  • halides for example sodium chloride or sodium bromide
  • hypohalites can be subjected to anodic oxidation to form hypohalites which are oxidizing agents.
  • any inorganic or organic redox systems can be used whereby the necessary potential can be obtained. A person skilled in the art is therefore easily able to find suitable redox systems.
  • the process of the invention is carried out with inorganic reducing or oxidizing agents.
  • the reducing and oxidizing agents mentioned can each also be used in mixtures with other reducing and oxidizing agents respectively, in which case the mixing ratios within each mixture are not critical.
  • the reducing and oxidizing agents are preferably used in the concentration range from 0.1 mmol/l to 5 mol/l and more preferably between 1 mmol/l and 0.1 mol/l.
  • the process according to the invention is customarily carried out at temperatures which are adapted to the dye, to the redox system and especially to the color change to be obtained.
  • the process according to the invention is preferably carried out between 15° C. and 150° C., more preferably between 20° C. and 95° C. and most preferably between 40° C. and 60° C.
  • the dyed textile substrates to be treated there are no technical restrictions, since the process according to the invention can be adapted to the material. They can be present in the form of fibers, yarns, wovens, knits or already as wholly or partly made-up products.
  • the dyed textile substrates are preferably composed of fiber materials composed of cellulose fibers, synthetic fibers or blends thereof.
  • textile substrates composed of cellulose fibers and blends thereof with manufactured fibers, such as polyester or polyamide fibers.
  • textile substrates composed of polyester or polyamide fibers can be used as well.
  • dyes to be changed can all be color changed according to the invention.
  • Cellulose fibers can be dyed with any class of dye customary for this substrate, preference being given to reactive dyes, vat dyes, sulfur dyes or direct dyes.
  • Substrates composed of polyester fibers can be dyed with disperse dyes for example.
  • the process according to the invention is particularly preferable for treating indigo-dyed cotton substrates.
  • the dye and the redox system have to be adapted to each other, ie the reducing or oxidizing agent has to be able to react with the dye to be able to change the dyeing.
  • dyes containing azo groups can be reductively cleaved or indigo can be subjected to a reversible dye reduction.
  • the treatment liquor is preferably circulated between the treatment assembly and the electrolytic cell in such a way that the electrochemically generated amount of active chemicals can be transported into the treatment assembly as well and the given concentration of chemicals to be reacted does not limit the current density of the electrolytic cell.
  • This adaptation can be effected by customary calculations based on electrolytic current and concentration of redox system used. If, for example, the cell current is 20 A and the concentration of redox system is 0.05 mol/l and the concentration of starting chemical is not to drop below 0.04 mol/l, a circulation rate of 1.24 l/min is necessary between the treatment assembly and the cell.
  • liquor ratio the liquor ratio
  • pH the pH
  • assistants such as dispersants, detergents, lubricants or enzymes.
  • the liquor ratio must be taken into account because the redox potential generates a certain concentration of active chemicals and the amount used will vary with the liquor ratio. Since many redox chemicals are strongly pH-dependent, the pH influences not only the measured redox potential but also the chemical reactivity.
  • dispersants and/or wetting agents can modify the penetration of the treatment liquor into the dyed textile material to be treated and also the degree of detachment and dispersion of the dye pigments from the textile material.
  • Lubricants can be used to reduce any shearing effects which arise.
  • Enzymes such as cellulases can detach dyed fiber fragments from the dyed textile substrate to be treated and so intensify any abrasive treatment.
  • Redox-active enzymes such as laccase can under suitable conditions augment dye destruction and hence augment or modify the desired color change.
  • FIG. 1 is a schematic view of an arrangement which is suitable for carrying out the process of the invention.
  • An electrolytic cell made up of a working electrode b, a membrane d, a counterelectrode e, current feeds c and current supply a is used to generate the reducing or oxidizing agent (desired form of the redox couple used) in the liquor k, which is pumped through a circulating system g into the treatment assembly m.
  • the treatment assembly holds the dyed textile substrate f to be treated, which is subjected therein to additional mechanical and/or hydrodynamic stresses.
  • the redox potential in the liquor h in the treatment assembly is measured by the redox measuring means i.
  • the value measured here forms the basis for the adaptation of the supply current strength of the cell current supply a via the control loop l. This provides control over the redox potential and hence over the treatment effect to be achieved on the dyed textile substrate.
  • the treatment liquor is dropped via the outlet j from the treatment assembly, which subsequently effects for example rinsing processes with the textile substrate.
  • the dropped treatment liquor can be sent to a regenerating stage.
  • FIG. 2 shows an arrangement in which the electrolytic cell and the treatment assembly form a unit and the two electrodes are disposed in the immediate vicinity of the dyed textile substrate to be treated, and also the two working phases.
  • the power supply a feeds electricity through lines c to the working electrode b and to the counterelectrode e.
  • the dyed textile substrate f to be treated contains the amount of electrolyte required for electrolysis and hence the cell content h and the treatment liquor k are identical. Since potential measurement is for geometric reasons relatively costly and inconvenient, the measurement is carried out, after the power supply has been interrupted, as a rest potential measurement with the aid of line i, which is connected to the working electrode b, and of the reference electrode n. Potential measurement and current control to set the desired redox potential therefore take place intermittently.
  • Anode expanded titanium metal with Pt mixed oxide coating, two electrodes, each 10 cm in active length and 3.0-3.1 cm in width.
  • the treatment apparatus/electrolytic cell circulation is provided by a peristaltic pump rated 150 ml/min. Inside the treatment apparatus, the liquor is agitated by a magnetic stirrer (500 rpm) with heating.
  • the vessel contains the Pt electrode and reference electrode and also the temperature measurement and a pH measurement system. Constant pH during electrolysis is ensured by metering alkali into the anolyte.
  • Anolyte volume 850 ml, 1 g/l of sodium carbonate p.A. and 10 g/l of NaCl p.A.
  • Catholyte volume 350 ml. Catholyte composition same as anolyte.
  • Fabric weight 11.18 g of indigo-dyed woven cotton (denim).
  • a redox potential of +440 to +470 mV is set at a pH of 10.0 to 10.2 for a period of 35 min by controlling the cell current in the range from 100 mA to 500 mA (cell voltage 2.40 to 5.10 V).
  • Sample 1 is treated for 15 min and sample 2 for 35 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 850 ml, 0.5 g/l of sodium carbonate p.A, 0.5 g/l of sodium bicarbonate and 10 g/l of NaCl p.A, catholyte composition same as anolyte.
  • Fabric weight 10.86 g of indigo-dyed woven cotton (denim).
  • a redox potential of +700 to +720 mV is set at a pH of 8.1 for a period of 32 min by controlling the cell current in the range from 200 mA to 500 mA (cell voltage 3.10 to 4.80 V).
  • Sample 1 is treated for 12 min and sample 2 for 32 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of sodium carbonate p.A, 0.1 g/l of sodium bicarbonate and 10 g/l of NaCl p.A, catholyte composition same as anolyte.
  • Fabric weight 10.93 g of indigo-dyed woven cotton (denim).
  • a redox potential of +455 to +555 mV is set at a pH of 10.5 for a period of 45 min by controlling the cell current in the range from 0 mA to 500 mA (cell voltage 5.15 V).
  • Sample 1 is treated for 25 min and sample 2 for 45 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 0.5 g/l of sodium carbonate p.A, 0.5 g/l of sodium bicarbonate and 10 g/l of NaCl p.A, 0.1 g/l of potassium bromide, catholyte composition same as anolyte.
  • Fabric weight 10.90 g of indigo-dyed woven cotton (denim).
  • a redox potential of +720 to +750 mV is set at a pH of 8.1 to 8.6 for a period of 40 min by controlling the cell current in the range from 50 mA to 500 mA (cell voltage 2.4 to 5.0 V).
  • Sample 1 is treated for 20 min and sample 2 for 40 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 0.5 g/l of sodium carbonate p.A, 0.5 g/l of sodium bicarbonate, 10 g/l of NaCl p.A and 0.1 g/l of potassium bromide, catholyte composition same as anolyte.
  • Fabric weight 10.78 g of indigo-dyed woven cotton (denim).
  • a redox potential of +710 to +745 mV is set at a pH of 8.9 to 9.5 for a period of 30 min by controlling the cell current in the range from 50 mA to 500 mA (cell voltage 2.2 to 5.1 V).
  • Sample 1 is treated for 10 min and sample 2 for 30 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of sodium bicarbonate, 10 g/l of NaCl p.A and 0.1 g/l of potassium bromide, catholyte composition same as anolyte.
  • Fabric weight 10.78 g of indigo-dyed woven cotton (denim).
  • a redox potential of +710 to +815 mV is set at a pH of 7.5 to 7.7 for a period of 30 min by controlling the cell current in the range from 20 mA to 500 mA (cell voltage 1.65 to 5.1 V).
  • Sample 1 is treated for 33 min and sample 2 for 63 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of sodium bicarbonate, 10 g/l of NaCl p.A and 0.1 g/l of potassium bromide, catholyte composition same as anolyte.
  • Fabric weight 10.34 g of indigo-dyed woven cotton (denim).
  • a redox potential of +759 to +825 mV is set at a pH of 7.7 to 8.3 for a period of 30 min by controlling the cell current in the range from 500 mA (cell voltage 4.8 to 5.05 V).
  • Sample 1 is treated for 10 min and sample 2 for 30 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 770 ml, 1.0 g/l of violuric acid, 12 g/l of acetic acid and 4 g/l of NaOH,
  • Catholyte 300 ml of aqueous sodium hydroxide solution 40 g/l.
  • a redox potential of +604.7 to +633 mV is set at a pH of 4.6 for a period of 36 min by controlling the cell current in the range from 0 mA to 500 mA (cell voltage 5.3 V).
  • Sample 1 is treated for 16 min and sample 2 for 36 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of violuric acid, 12 g/l of acetic acid and 4 g/l of NaOH,
  • Catholyte 300 ml of aqueous sodium hydroxide solution 40 g/l.
  • a redox potential of +608.7 to +661 mV is set at a pH of 4.6 for a period of 55 min by controlling the cell current in the range from 200 mA to 500 mA (cell voltage 3.2 to 4.55 V).
  • Sample 1 is treated for 31 min and sample 2 for 55 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of violuric acid, 12 g/l of acetic acid and 4 g/l of NaOH,
  • Catholyte 300 ml of aqueous sodium hydroxide solution 40 g/l.
  • a redox potential of +564 to +615 mV is set at a pH of 4.6 for a period of 31 min by controlling the cell current in the range from 200 mA to 500 mA (cell voltage 3.25 to 5.2 V).
  • Sample 1 is treated for 11 min and sample 2 for 31 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • the electrolytic cell is constructed and the process is carried out as in use example 1.
  • Anolyte volume 800 ml, 1.0 g/l of violuric acid, 12 g/l of acetic acid and 4 g/l of NaOH,
  • Catholyte 300 ml of aqueous sodium hydroxide solution 40 g/l.
  • a redox potential of +477 to +582 mV is set at a pH of 4.6 for a period of 31 min by controlling the cell current in the range from 0 mA to 500 mA (cell voltage 5.2 V).
  • Sample 1 is treated for 20 min and sample 2 for 40 min under these conditions.
  • the removed samples are rinsed in cold water, whizzed and dried at 110° C.
  • a woven fabric which has been dyed with indigo or red reactive dye and has a mass of 12.4 g for example is wetted with four times the amount (about 50 ml) of a solution of 1.0 g/l of sodium bicarbonate, 10 g/l of NaCl p.A. and 0.1 g/l of potassium bromide.
  • a Pt electrode having a surface area of 2.25 cm 2 serves as a working electrode and a stainless steel electrode serves as a counterelectrode. The potential of the working electrode is measured against Ag/AgCl 3M KCl after interruption of the current and after a delay time of 2 min for adjustment of the potential.
  • a woven fabric which has been dyed with indigo or red reactive dye and has a mass of 12.4 g for example is wetted with four times the amount (about 50 ml) of a 0.024 mol/l iron(II) complex solution (triethanolamine and polyhydroxycarboxylic acid as ligands).
  • a Pt electrode having a surface area of 2.25 cm 2 serves as a working electrode and a stainless steel electrode serves as a counterelectrode. The potential of the working electrode is measured against Ag/AgCl 3M KCl after interruption of the current and after a delay time of 2 min for adjustment of the potential.
  • FIG. 1 A first figure.

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  • Textile Engineering (AREA)
  • Coloring (AREA)
US10/498,161 2001-12-13 2002-12-05 Changing the color or dyed textile substrates Abandoned US20050028291A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10161265A DE10161265A1 (de) 2001-12-13 2001-12-13 Verfahren zur Farbveränderung von gefärbten textilen Substraten
DE10161265.6 2001-12-13
PCT/EP2002/013778 WO2003054289A2 (de) 2001-12-13 2002-12-05 Verfahren zur farbveränderung von gefärbten textilen substraten

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US (1) US20050028291A1 (pt)
EP (1) EP1468139A2 (pt)
CN (1) CN1306110C (pt)
AU (1) AU2002358095A1 (pt)
BR (1) BR0214839A (pt)
CA (1) CA2470080A1 (pt)
DE (1) DE10161265A1 (pt)
HK (1) HK1073142A1 (pt)
MX (1) MXPA04005676A (pt)
TW (1) TWI276667B (pt)
WO (1) WO2003054289A2 (pt)

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US20140143959A1 (en) * 2011-07-29 2014-05-29 Henkel Ag & Co. Kgaa Washing or cleaning agent with electrochemically activatable mediator compound
US20160051948A1 (en) * 2013-09-26 2016-02-25 Shjiazhuang Success Machinery Electrical Co., Ltd. Method and device for emulsifying emulsion explosive
ES2584436A1 (es) * 2016-06-28 2016-09-27 Universitat Politècnica De València Procedimiento electroquímico para el blanqueo de telas que contienen fibras celulósicas naturales
CN109514110A (zh) * 2018-12-29 2019-03-26 江门职业技术学院 一种激光雕刻印花工艺及实施该工艺的设备
WO2019239111A1 (en) 2018-06-12 2019-12-19 Xeros Limited Method for reducing the colour intensity of a coloured textile
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WO2003054289A2 (de) 2003-07-03
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