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
  • 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
  • D06P3/16—Wool using acid dyes
• • 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
  • Y10S8/02—Vinyl sulfones and precursors thereof
• • 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 blends using the exhaust dyeing technique with aqueous liquors of dyes which are drawn under strongly acidic conditions.
• the dyeing of wool from an aqueous medium with acid dyes at pH values from 2 to 3 is well known. This pH is usually generated by adding strong acids to the dyebath, e.g. B. of sulfuric acid or formic acid.
• the dyes used in practice generally give a fastness level on the dyed textile material, which is sufficient for woolen piece goods, but is not sufficient for sliver, yarn or flake.
• the leveling behavior of the dyes applied in this way, on the other hand, is good and normally presents no difficulties.
• dyeing wool with reactive dyes is now familiar to the person skilled in the art.
• This class of dyes is used on wool taking a variety of precautions at pH values in the range of 5.5 colored up to 6.5.
• the said restrictive precautions such as maintaining temperature levels, dyeing process with very long heating times of the liquor, etc., primarily serve to achieve level dyeings, since this is usually the problem with dyeing wool with reactive dyes. This results in dyeings with a very high level of fastness under these weakly acidic conditions.
• the sample card S 8126 "®Remazolan dyes on wool” from Farbwerke Hoechst AG from 1963 describes the dyeing of woolen articles with reactive dyes of the vinylsulfone type even from strongly acidic liquors, but the dyeing process explained there has not yet developed removes the prejudice that level stains can only be obtained if extended heating times are observed.
• the authenticity properties of such dyeings produced in a strongly acidic environment are, however, somewhat lower than the standard according to the above-mentioned working technique at weakly acidic pH values.
• the object of the invention in question was therefore to develop a dyeing process for wool, which allows the dyer, while maintaining excellent levelness, to obtain dyeings under strongly acidic conditions, but with an increased level of fastness, and which enables the weaknesses in the ranges to be weak switch off the strongly acidic acid dyes without having to change the dyeing process
• Suitable reactive dyes for carrying out the invention are the organic dyes known in the Color Index, 3rd edition 1971 and additions 1975 under the generic term “CI Reactive Dyes”, which form a covalent bond with fibers containing OH groups and / or NH groups are able. These are predominantly those dyes which contain at least one group which is reactive with hydroxyl or amino groups in the fiber material having a polyamide structure, a precursor therefor or a substituent which is reactive with the constituents of the fiber molecule mentioned.
• dyes of the vinyl sulfone type are used for the present process, with which the fiber reacts via an addition mechanism via the vinyl sulfone form of the dye.
• such dyes as precursors of this characteristic group can have the ß-sulfatoethylsulfone group, the ß-chloroethylsulfone group or the ß-dialkylamino-ethylsulfone group, which during the dyeing process with the interim formation of the vinylsulfone - Form react with the fiber.
• Reactive dyes with other reactive systems can only be used for the new process after an extremely strict selection, because only individual dyes from such ranges can be dyed on wool under the strongly acidic application conditions.
• dyes which, in addition to a reactive radical of the vinylsulfone type or a reactive group described above as a precursor thereof, additionally have one or more groups which react with the wool according to the substitution mechanism, e.g. a monochlorotriazinyl or monofluorotriazinyl group, on wool articles according to the process give dyeings with excellent levelness and very high fastness properties.
• Particularly suitable as the base of the chromophoric system of these organic dyes with reactive groups 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 dyer is thus given the opportunity to use his dye store even better by combining conventional acid dyes with reactive dyes, without being forced to give up the dyeing process introduced hitherto due to the shortcomings in trichromatic behavior To suffer loss of authenticity.
• Sulfuric acid is expediently used as the acid for adjusting the pH from 2 to 3 in the dyeing according to the invention. Amounts of 3 to 5 ⁇ of 96% H 2 SO 4 , based on the wool weight, are required.
• the pull-out dyeing method according to the invention mainly comes to ordinary, i.e. wool that has not been pretreated with an anti-felt finish or fiber mixes constructed in this way. In general, it is used for dyeing piece goods, where the leveling of the dyeings is particularly important. However, the higher authenticity level of the dyeings that can be achieved also allows this dyeing technique to be used for a different presentation of the wool in special cases
• the pull-out liquor with all ingredients is prepared at 50 ° C.
• the bath is now heated to the dyeing temperature (95 ° to 110 ° C.) within 30 to 50 minutes and the goods are then dyed for 60 to 90 minutes under these temperature conditions.
• the resulting dye is then cooled by adding cold water to the dyeing tank, then rinsed clear and dried.
• the aforementioned method has certain disadvantages compared to the following variant, so that the latter will generally be preferred. These disadvantages are primarily the longer dyeing time (2 to 2 1/2 hours). In addition, carbonized wool must be neutralized before the dyeing process, which in turn means more time and more chemicals.
• the dyebath is added with both types of dye and auxiliaries, but without the sulfuric acid required for dye fixation 50 ° C, drives the liquor to the dyeing temperature (95 ° to 110 ° C) as quickly as the mechanical equipment allows and then doses the acidity of the liquor under fixing conditions for the dyes over a longer period (20 to 40 minutes) distributed in linear or progressive quantities, the time of metering being included in the total staining time of 60 to 90 minutes.
• the relevant measures can be carried out discontinuously in portions and also continuously in terms of quantity in accordance with a predetermined time schedule.
• the dyed goods are then cooled, rinsed and dried.
• This second process variant results in a significant reduction in dyeing time (only 80 to 120 minutes in total).
• the authenticity level of the dyeings as well as their loss (levelness) are completely preserved.
• carbonized wool which does not have to be subjected to prior neutralization, is also suitable for the dyeing treatment in accordance with this variant, so that the total time saved in this special case is even greater.
• 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 correctly.
• the bath temperature is now raised to 98 ° C. within 40 minutes and the goods are then dyed for 80 minutes under these temperature conditions. Then you cool the dyed wool by adding cold water to the bath and then rinse the latter clear with further water.
• the metering process is carried out manually in such a way that the acid is poured into 20 liters of cold water and linear amounts of 4 liters each (in the last time the rest) of the total volume of this dilute acid are added to the dye bath in portions. After the acid addition has ended, the wool is dyed for a further 40 minutes at 100 ° C., the dyed material is then cooled, rinsed with water and finished.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)
• Compounds Of Unknown Constitution (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

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Cited By (3)

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• 1985
  • 1985-12-18 DE DE19853544796 patent/DE3544796A1/de not_active Withdrawn
• 1986
  • 1986-12-12 AT AT86117358T patent/ATE53080T1/de not_active IP Right Cessation
  • 1986-12-12 DE DE8686117358T patent/DE3671486D1/de not_active Expired - Fee Related
  • 1986-12-12 EP EP86117358A patent/EP0226982B1/fr not_active Expired - Lifetime
  • 1986-12-16 US US06/942,520 patent/US4911735A/en not_active Expired - Fee Related

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