Classifications

• • 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
  • D06P5/02—After-treatment
• • 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
  • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
  • D06P3/58—Material containing hydroxyl groups
  • D06P3/60—Natural or regenerated cellulose
  • D06P3/66—Natural or regenerated cellulose using reactive dyes

Definitions

• the present invention relates to the technical field of dyeing with reactive dyes.
• Reactive dyes are widely used for dyeing cellulosic fibers, i.e., particularly cotton.
• they contain reactive groups, known as reactive anchors, which in the course of dyeing from an aqueous liquor under alkaline conditions combine with the hydroxyl groups of the cellulose to form covalent bonds. It is thus possible to obtain dyeings which have particularly good wetfastnesses.
• reactive anchors reactive groups, known as reactive anchors, which in the course of dyeing from an aqueous liquor under alkaline conditions combine with the hydroxyl groups of the cellulose to form covalent bonds. It is thus possible to obtain dyeings which have particularly good wetfastnesses.
• the desired reaction of the reactive group with the cellulose there is also a reaction taking place with water, causing the dye to become hydrolyzed. The hydrolyzed dye is no longer able to react with the cellulose and remains on the fiber in unattached form.
• This hydrolyzed dye has to be removed as completely as possible after the dyeing step, since it would otherwise have an adverse effect on the wetfastnesses of the dyeing.
• the dyed textile material is treated in costly, inconvenient and time-intensive rinsing steps at temperatures of up to 95°C, in the course of which appreciable amounts of water and energy are consumed.
• circular knits exhaust-dyed in jet machines are generally washed off batchwise.
• the textile material gathered into a rope on a lot- or piecewise basis, is propelled by a jet nozzle either with rinse liquor, with air/steam or with a combination of the two media and moves into a scray.
• the washoff operation itself follows directly on from the dyeing step and always takes the form of initially discharging the dyeing liquor, then making good the lost liquor by replenishing with fresh water, heating if necessary, propelling the fabric rope in this treatment liquor for a defined period by means of the technique described above, discharging again, and repeating this operation until the rinse water is colorless and the fabric no longer releases hydrolyzed dye.
• up to 6 rinse baths at various temperatures are generally needed, as the following schedule for washing off heterocyclic reactive anchor systems illustrates:
• the individual treatment baths may optionally be additionally mixed with auxiliary chemicals for enhanced effects and efficiency.
• liquor ratio mass of water to weight of fabric.
• EP 0 088 273 A2 discloses an aftertreatment process for reactive dyeings which consists of a sequence of alternating aqueous rinse and liquorless hot treatment operations. Rinse and liquorless hot treatment operations each need to be carried out 2 to 8 times to obtain an acceptable result. The process thus has appreciable water, energy and time requirements and does not meet present-day requirements in terms of ecology and economy.
• the present invention provides a process for washing off reactive-dyed textile material, which process consists of the sequence
• the process of the present invention generally immediately follows the dyeing step.
• the first and second rinsing steps are carried out at a temperature of 70 to 95°C and each takes from 5 to 15 minutes, particularly advantageously 9 to 11 minutes.
• the first and second rinsing steps can be carried out in a single rinse bath or in two or more successive rinse baths. It is preferred to carry out the first rinsing step in two successive rinse baths and the second rinsing step in a single rinse bath.
• the temperature is preferably maintained at 70 to 100 0 C.
• it is preferably agitated, for example with air or with steam, during the dwelling step.
• no measures whatsoever are taken during the dwelling step.
• the dwelling step preferably takes from 10 to 15 minutes.
• a textile fabric rope batch-dyed in a jet dyeing machine is rinsed by discharging the dyeing liquor and in the jet transportation apparatus rinsing once at 70 - 95°C for 9 to 11 minutes, then circulating the fabric at 70 - 100 0 C and a liquor ratio of 150 - 300% via air/steam propulsion and then finally rinsing once more at 70 - 95°C for 9 to 11 minutes.
• Particularly preferred assemblies in which this process can be carried out are for example the machines described in EP 0 310 013 A1 , EP 1 024 220 A2 and EP 1 526 205 A2, and also drum-type washing machines with tumbler function.
• a continuously dyed textile material is led after dyeing into a continuous washing assembly where the first rinsing step takes place, then into a suitable apparatus for the dwelling step and finally into a further continuous washing assembly where the second rinsing step takes place.
• Suitable continuous washing assemblies are known to a person skilled in the art.
• Apparatuses suitable for the dwelling step are in particular steamers, particularly in the manner of the E-Control steamer, J-boxes, roller bed steamers, festoon loop steamers or tumblers. These apparatuses are known to a person skilled in the art and are customarily used in the textile industry.
• the process of the present invention can be used to wash off in particular textile materials composed of natural or modified hydroxyl-containing or natural, modified or synthetic carboxamido-containing fiber materials.
• Cotton is a particularly preferred textile material.
• the textile material is preferably in the form of circular knits, in particular circular knits and wovens.
• a customary jet dyeing machine with air propulsion is used to dye a 180 g/m 2 circular knit by an isothermal process in a liquor ratio of 8:1 with 1.5% of C.I. Reactive Red 198 based on the fabric weight for 60 min.
• the dyeing liquor is discharged and the machine is refilled with fresh water to a liquor ratio of 8:1. After circulating at 80 0 C for 10 min, the liquor is again discharged down to a fabric residual moisture content of about 250 - 300%.
• the fabric rope is further circulated for 15 min via purely air propulsion with air preheated to 70 0 C and in the process further freed of excess rinsing liquor at a wipe-off device.
• the material obtained corresponds in its fastness level to a material conventionally washed off with 7 baths.
• a conventional jet dyeing machine with air propulsion is used to dye a 140 g/m 2 woven fabric by an isothermal process in a liquor ratio of 8:1 with 2% of C.I. Reactive Yellow 145 based on the fabric weight for 60 min.
• the dyeing liquor is discharged and the machine is refilled with fresh water up to a liquor ratio of 8:1.
• the liquor is circulated at 80 0 C for 10 min and then discharged again.
• the fabric is removed from the machine, dewatered by passing it through a pad- mangle and presented to a festoon loop steamer for thermal treatment. Following a dwell time of 10 min at 80°C, the fabric additionally passes through two continuous washing compartments filled with water at 80°C. The fabric is subsequently squeezed off, plaited down and dried.
• the fastness level corresponds to that of a fabric continuously washed off by conventional methods.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=41110848

Family Applications (1)

Country Status (5)

Citations (3)

• 2009
  • 2009-07-10 WO PCT/EP2009/058856 patent/WO2010007008A1/en active Application Filing
  • 2009-07-10 BR BRPI0915929A patent/BRPI0915929A2/pt not_active Application Discontinuation
  • 2009-07-10 MX MX2011000591A patent/MX2011000591A/es unknown
  • 2009-07-10 CN CN2009801275598A patent/CN102112681A/zh active Pending
  • 2009-07-10 EP EP09780457A patent/EP2304098A1/en not_active Withdrawn

Patent Citations (3)

Also Published As

Similar Documents

Legal Events