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
• • 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
  • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
  • D06P1/0032—Determining dye recipes and dyeing parameters; Colour matching or monitoring
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S8/00—Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
  • Y10S8/916—Natural fiber dyeing
  • Y10S8/917—Wool or silk

Definitions

• the present invention relates to a process for the level dyeing of wool or the wool portion of fiber mixtures according to the pull-out dyeing technique in a strongly acidic medium with aqueous liquors of reactive dyes which have at least one group in their molecule which, under fixing conditions with the fiber via the vinyl sulfone form nucleophilic addition occurs in reaction.
• the dyeing of wool with reactive dyes is well known in practice.
• the textile material is treated with aqueous solutions of these dyes at temperatures of 98 ° to 106 ° C. and, depending on the desired depth of color, at precisely staggered pH values between 4.5 and 6.5, in order to achieve level and true dyeings.
• S 8126 "(R) Remazolan dyes on wool” from Farbwerke Hoechst AG describes a process by which reactive dyes of the vinylsulfone type in the form of the ⁇ -sulfatoethylsulfone derivatives are obtained by pulling them out of strongly acidic liquors at pH Values from 2 to 3 (adjusted with sulfuric acid) can be dyed on wool items.
• This procedure is characterized by a very slow heating of the dye bath from the initial temperature of 50 ° C to the actual dyeing temperature of 8 ° to 100 ° C and a subsequent long dyeing time of 60 to 90 minutes at the dyeing temperature. In total, pure dyeing times of 2 to 2 1/2 hours are expected for the implementation of this dyeing technique.
• level dyeings can only be obtained if extended heating times are taken into account.
• the task of the invention in question was therefore to develop a rapid dyeing process for wool with reactive dyes using the exhaust method, which, in addition to good levelness of the dyeings, has sufficient fastness properties of the same with a significant reduction in the total treatment time for the dye material compared to the working methods of the same type previously introduced for dyeing leaves.
• the object set out above is achieved according to the invention in that the reactive dyes of the vinylsulfone type and, if appropriate, all other ingredients, but no pull-out liquor containing the acid or acid-releasing agent required for fixing the dyes together with the dyestuff as quickly as possible and all at once Dyeing temperature in the range of 95 ° to 110 * 0 heated, d ate after reaching the same while maintaining appropriate isothermal conditions for the color Fabric fixation then adds sulfuric acid to the heated dye bath - distributed over a longer period of time - and the wool dyes at pH values between 2 and 3.
• the metering of the acid over a longer period of time to the dye liquor based on fixing conditions for the dye can be carried out quantitatively both linearly and progressively, but the time at which the bath temperature is kept constant in the course of the acid inflow is included in the total dyeing time and consequently, the latter is not extended in accordance with the procedure.
• the pure dosing time can be from 10 to 45 minutes, which advantageously shortens the total dyeing time (including dosing time) to a maximum of 70 minutes.
• the same quantity of acid is introduced into the dyebath p ro unit time. This can be done by introducing the sulfuric acid, usually diluted with water, either discontinuously in the same portions and at the same time intervals, or by continuously flowing it in the same amount per unit of time.
• a progressive dosing of the acidic fixer brings an increasing amount of acid into the dye bath per unit of time as the dosing time progresses, which can also be done manually.
• Newer dosing devices do this type of dosing automatically, so that only the desired slope of the progression according to a given mathematical function, e.g. linear, exponential or in the manner of a parabolic function.
• the amount of sulfuric acid to be introduced - like the dyeing time - depends on the desired depth of dyeing. If you charge 96% sulfuric acid, 3 to 5% of the wool weight is required. However, the concentrated acid in the claimed process is expediently diluted with water. On the one hand, this reduces the dangers when dealing with the acid, on the other hand, it allows a staggered, more even dosage.
• the dyeing process according to the present invention mainly comes down to ordinary, i.e. wool that has not been pretreated with an anti-felt finish or fiber mixes constructed in this way.
• wool is understood to mean that in any processing state, that is to say as a flake, sliver, yarn, piece goods or also in the form of finished parts.
• carbonized wool is also suitable for the dyeing treatment according to the invention, which need not be neutralized before dyeing. With all other dyeing processes for wool, this is a prerequisite for level dyeing failure. This time can also be saved in the new method, so that the total time saved is even greater.
• the organic dyes of the vinylsulfone type known under this generic term are used as reactive dyes, with which the fiber reacts according to an addition mechanism via the vinylsulfone form of the dye.
• This dye class is referred to in the Color Index, 3rd Auflape 1Q71 and supplements 1 q 75 as "CI Reactive Dyes" and includes chemical compounds with a dye character that are able to form a covalent bond with fibers containing OH groups and / or NH groups.
• the vinyl sulfone radical itself as the group which is reactive in such dyes with hyaroxyl or amino groups in the fiber material with a polyamide structure
• this characteristic grouping in particular the ß-sulfatoethylsulfone group, the ß-chloroethylsulfone group or the ß-Dialkylamino-ethylsulfone distr belong, which occur during the dyeing process with the intermediate formation of the vinyl sulfone form with the fiber in reaction.
• Reactive dyes with other reactive systems can also be dyed according to the invention, but it is a strict selection of dyes is required here, since the risk of receiving uneven dyeings is not completely eliminated by the new process for these dyes.
• dyes which, in addition to a reactive residue of the vinylsulfone type or a reactive grouping already described as a precursor thereof, additionally result in a grouping which reacts with the wool according to the substitution mechanism, e.g. a monochlorotriazinyl or monofluorotriazinyl group, very level dyeings with even better fastness properties.
• Particularly suitable as the base of the chromophoric system of these organic dyes are those from the series of the azo, anthraquinone and phthalocyanine compounds, it being possible for the azo and phthalocyanine dyes to be both metal-free and metal-containing.
• Reactive dyes of the type defined above often have more than one sulfonic acid group (except in the reactive grouping of the dye) in the molecule, which can be distributed as desired over the chromophore, but are preferably bound to its aromatic radicals.
• the bath temperature is kept constant during the acid addition and for a certain time afterwards. After the intended dyeing time, the dyeing is completed as usual for wool.
• the authenticity level of wool articles dyed according to the process which after the dyeing process is already at the level of real acid dyes, can be achieved by an ammoniacal aftertreatment of the dyeing at pH 8 to 8.5 and 80 * C can be further improved over 10 minutes.
• the following examples are not intended to restrict the claimed process in any way, especially not with regard to the reactive dyes used, but merely serve to illustrate the procedure according to the present invention.
• the l s in these exemplary embodiments contained percentages relate to the weight of the articles so marked and are calculated in the case of wool to the dry state of the color material.
• the reactive dyes mentioned are used in commercial form and quality. Dyes, which are conversion products of sulfonyl reactive dyes with N-methyl taurine, are present in the structure represented by the respective formula after being dissolved in accordance with the regulations.
• the temperature of the bath is kept constant at 100'C.
• the acid introduced has therefore been preheated to about the dyeing temperature.
• the goods are further dyed for a further 30 minutes at the same temperature. Then the extracted liquor, including the dyed wool, is cooled, the latter rinsed with water and finished as usual.
• a brilliant red dyeing of the knitted fabric with good general fastness properties is obtained. Contrary to expectations, the levelness of the coloring is very good, the coloring is excellent.
• the goods are further dyed at 106 ° C. for 10 minutes, then cooled together with the liquor, rinsed with water and finished as usual for wool.
• the liquor is cooled by adding cold water, rinsed clear and then the colored goods can be removed from the dyeing kettle.
• a dark blue (navy) color is obtained; of the fabric with excellent levelness and a very nice product appearance.
• the fabric is then dyed for a further 30 minutes at 106 ° C., the liquor and the goods are then cooled, the latter is rinsed with water and the dyed goods are finally finished in the customary manner.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)

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Citations (6)

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• 1985
  • 1985-12-18 DE DE19853544793 patent/DE3544793A1/de not_active Withdrawn
• 1986
  • 1986-12-12 AT AT86117353T patent/ATE44168T1/de not_active IP Right Cessation
  • 1986-12-12 EP EP86117353A patent/EP0226198B1/fr not_active Expired
  • 1986-12-12 DE DE8686117353T patent/DE3664064D1/de not_active Expired
  • 1986-12-16 US US06/942,530 patent/US4746324A/en not_active Expired - Fee Related

Patent Citations (6)

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