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
  • 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
  • D06P3/02—Material containing basic nitrogen
  • D06P3/04—Material containing basic nitrogen containing amide groups
  • D06P3/14—Wool
  • D06P3/148—Wool using reactive dyes

Definitions

• the present invention relates to the continuous and uniform real dyeing of wool fibers with reactive dyes containing sulfo groups after a pad-steaming process without intermediate drying.
• This subheading also includes products that allow working in two-phase dyeing liquors. Processes in the category previously discussed bring with them a high water consumption and consequently require the consumption of a lot of energy and a correspondingly large amount of labor. Today, however, energy savings and easy-to-remove wastewater play an important role.
• the invention explained below is based on the object of eliminating the disadvantages of the known processes for the continuous dyeing of wool fibers with sulfo-containing reactive dyes in relation to the length of the dyeing time, and in particular to shorten the steaming time.
• the mandatory use of textile auxiliaries should be as low as possible, so that the emission of such polluted wastewater is largely reduced.
• the fiber material to be dyed is padded with an aqueous dye liquor containing 20 to 50 g / l, preferably 30 to 40 g / l of sodium acetate, in addition to the dissolved dyestuffs, and after removing the excess liquor, the wet padding is for the purpose Dye fixation for 5 to 13 minutes, preferably 9 to 12 minutes, the action of saturated steam at temperatures from 102 ° to 115 ° C.
• the feasibility of the new process is based on the principle of adding large amounts of sodium acetate to the padding liquor combined with a subsequent short-term steaming process without prior drying of the padding with the reactive dyes.
• concentration of sodium acetate is such that it is present in the dye preparation in a significant excess based on the amount that would be required for the setting and maintenance of weakly acidic to neutral pH conditions.
• the method of operation according to the invention allows the wool material without the involvement of additional textile; to dye tools or solubilizers continuously.
• the claimed pad dyeing technique is characterized above all by the fact that the color strength is very high. Process products is achieved. The product image that is obtainable in this way is outstanding, resulting in color yields that are up to 100% greater than with the previously usual methods for continuous wool dyeing.
• the level of authenticity that can be achieved with the high color strength of the dyeings must be regarded as surprising.
• the extraordinarily good fastness properties result from the covalent bond between dye and wool fiber that takes place within a very short time, which in turn has its origin in the use of sodium acetate.
• no additional measures such as pH control etc. need to be taken, so that the implementation of the method described is very simplified.
• Fiber damage does not occur in the course of the dyeing process according to the invention, although the pH of the padding liquor is about 9 at the start of the treatment. Firstly, the exposure time in this environment is very short, it is only a few seconds, and immediately after the goods enter the steamer, acetic acid is released, which then shifts the pH value to weakly acidic. At the end of the steam treatment, however, the padding liquor medium is shifted back to alkaline, but this state also only lasts for a few seconds and at the same time replaces an alkaline aftertreatment of the dyeings produced.
• a very special advantage under the given conditions is the stability of the padding liquors, which is over 24 hours in this very weakly alkaline environment. This makes the entire dyeing process easier to handle.
• the padding liquors used according to the invention can additionally contain thickeners, so that they can also be used for Vigoureux printing due to the more viscous consistency set in accordance with a modification of the present invention.
• the rest of the procedure, in particular the measures for dye fixation, remains the same.
• wool fibers are particularly suitable in the form of sliver, yarn, thread sheets and bundles of yarn, but also fabrics.
• individual threads can also be treated in this way, but the effectiveness of the method is questioned in this case.
• the new process is also suitable for dyeing the wool portion of fiber blends.
• the dyeing technique according to the present invention can also be applied to wool fibers which have been subjected to a "felt-free" finishing process - such wool is generally referred to as "superwashed” wool.
• These are wool fibers, for example, with a polyimine or polyacrylic resin film (according to the information in Melliand textile reports 9/1971, page 1100, or in the Journal of the Society of Dyers and Colourists, Volume 88, Number 3/1972, pages 93-100).
• a textile article made from this material must withstand the hard stresses not required and not achieved with normal wool, such as washing several times at 60 ° C with the use of household detergents containing perborate, without matting, and consequently be color-fast. Such requirements at this high fastness level, especially in the detergents and perspiration fastness, are achieved in the first 'line of dyeings with reactive dyes.
• the organic dyes known under this term come into consideration as reactive dyes.
• This class of dyes is referred to in the Color Index, 3rd edition 1971 as "reactive dyes". These are predominantly those dyes which contain at least one group which is reactive with the amino groups of polyamide fibers, a precursor therefor or a substituent which is reactive with the amino groups of polyamide fibers.
• Particularly suitable as the basic body of the organic dyes are those from the azo, anthraquinone and
• Phthalocyanine dyes where the azo and phthalocyanine dyes can be both metal-free and metal-containing.
• Reactive groups and precursors which form such reactive groups include, for example, epoxy groups, the ethyleneimide group, the 'vinyl grouping in the vinylsulfone or acrylic acid radical, also the ⁇ -sulfatoethylsulfone group, the ⁇ -chloroethylsulfone group or the ⁇ -dialkylamino-ethylsulfone group.
• Derivatives of the tetrafluorocyclobutyl series e.g. Tetrafluorocyclobutylacrylic acid, in question.
• the reactive substituents in reactive dyes are those that are easily removable and leave an electrophilic residue.
• suitable substituents are 1 to 3 halogen atoms on the following ring systems: quinoxaline, triazine, pyrimidine, phthalazine, pyridazine and pyridazone.
• Dyes with several identical or different reactive groups can also be used.
• Such reactive dyes of the type defined above often have more than one sulfonic acid group (apart from the reactive constituent of the dye) in the molecule, which can be distributed as desired over the chromophore, but are preferably bound to its aromatic radicals. Based on the color yields achievable with conventional exhaust processes, the above-mentioned dyes yield very good yields in the case of the continuous process according to the invention.
• the claimed process has been found to be superior to the known dyeing methods in which acetic acid (e.g. 25-35 ml / 1 60% acetic acid) or acetic acid together with urea instead of sodium acetate has been added to the padding liquor.
• acetic acid e.g. 25-35 ml / 1 60% acetic acid
• urea instead of sodium acetate
• Woolen fabric made from non-finished woolen fibers in plain weave is padded at a pad temperature of 25 ° C and a liquor absorption of 105% (by weight of the dry goods) with an aqueous liquor which contains a solution of 16 g of the reactive dye of the formula in liters and contains 40 g of sodium acetate.
• This padding liquor is also 10 g / 1 m-nitrobenzenesulfonic acid sodium added as a reducing agent.
• the still moist fiber material is then passed through a damper immediately after the padding process and steamed there for 12 minutes in saturated steam at 103 ° C.
• the textile material treated in this way is then rinsed first with cold water, then with water at 40 ° C. and finally in an aqueous bath with the addition of 1 g / l of a nonionic detergent containing 30% by weight of a reaction product of 1 mol of stearylamine with 12 mol Ethylene oxide, and 1.5 ml / 1 ammonia (pH 8.5) soaped at 55 ° C for 5 minutes. Finally, the dyed goods are rinsed warm and cold with water.
• Knitted fabric made from chlorinated wool fibers is padded with an aqueous liquor containing 16 g of the reactive dye of the formula at a room temperature and a liquor absorption of 95% (by weight of the dry fabric) Contains 45 g of sodium acetate and 8 g of sodium m-nitrobenzenesulfonate.
• the still moist fiber material is then immediately passed through a damper and steamed there at 110 ° C. for 9 minutes.
• the colored goods are aftertreated as in Example 1. A strong, brilliant orange color is obtained.
• Wool yarn from non-chlorinated wool is padded in the form of parallel bundles of yarn at a block temperature of 30 ° C and a liquor absorption of 90% (by weight of the dry goods) by dipping and squeezing three times with an aqueous liquor which contains 20 g of the liter Dye Reactive Blue 19 with the CI no. 61200, 35 g sodium acetate and 9 g m-nitrobenzenesulfonic acid sodium.
• the still moist fiber material is then immediately passed through a steamer without intermediate drying and steamed there at 115 ° C. for 7 minutes. After a subsequent, cold and warm rinsing with water, an aftertreatment is carried out as described in Example 1. A navy blue dyeing is obtained on the yarn.
• Chlorinated wool fabric (plain weave) is padded with an aqueous liquor at room temperature and a liquor absorption of 100% (by weight of the dry goods), which is in liters 16 g of the reactive dye of the formula Contains 50 g of sodium acetate and 10 g of sodium m-nitrobenzenesulfonate.
• the still moist wool material is then steamed in a steamer at 102 ° C. for 13 minutes without intermediate drying and aftertreated as described in Example 1. A strong red color is obtained.
• Example 4 The type and amounts of the additives and the implementation of the process can also be found in Example 4. A deep, flowery black is obtained on the wool fabric.
• Wool comb which has been equipped with polymer-free polyamide-epichlorohydrin, is padded at room temperature and with a liquor absorption of 110% (by weight of the dry goods) with an aqueous liquor which contains 15 g of the dye Reactive Red 4 with the CI no . 18 contains 105 and 45 g of sodium acetate.
• the still moist fiber material is passed through a damper immediately after the padding process and steamed there for 11 minutes at 102 ° C. to fix the dye.
• the textile material treated in this way is then rinsed first with cold water, then with water at 40 ° C. and then in an aqueous bath with the addition of 1 g / l of a nonionic detergent containing 30% by weight of a reaction product of 1 mol of stearylamine with 12 mol Ethylene oxide, and 1.5 ml / 1 ammonia (pH 8.5) soaped at 55 ° C for 5 minutes.
• the dyed goods are then rinsed warm and cold with water. A very strong red color is obtained.
• Wollkammzug is padded at room temperature and a liquor absorption of 100% (by weight of the dry goods) with an aqueous liquor containing 16 g of the reactive dye of the formula in liters Contains 50 g of sodium acetate and 10 g of sodium m-nitrobenzenesulfonate.
• the still moist wool material is steamed for 6 minutes at 115 ° C immediately after padding.
• the post-treatment of the goods so dyed is carried out as in Example 6. The result is a strong, clear blue color.

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Citations (6)

• 1981
  • 1981-02-18 DE DE19813105906 patent/DE3105906A1/de not_active Withdrawn
• 1982
  • 1982-02-17 EP EP82101147A patent/EP0058432B1/fr not_active Expired
  • 1982-02-17 DE DE8282101147T patent/DE3261322D1/de not_active Expired

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