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
  • D06P3/02—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 dyeing of wool with reactive dyes containing sulfo groups by the exhaust method.
• German patent application DE-B-28 45 516 describes a process with this aim, according to which metal complex dyes with a maximum of two sulfo groups from an aqueous medium at pH values of about 5 and temperatures between 70 ° and 85 ° C in the presence of high Amounts of neutral salts are dyed on the textile.
• this known way of working is limited to the treatment of felt-free finished wool fibers, which have a stronger drawing power for the type of dye used than untreated wool.
• the actual, narrower temperature range used in practice extends from 77 ° to 80 ° C.
• an ammoniacal aftertreatment of the finished dyeing is expedient in order to remove unfixed dye components from the fiber.
• the purpose of the present invention is to develop a low-temperature dyeing process with the aid of which it is possible to do it in a relatively simple manner and with little effort, ordinary wool fibers, that is to say one which has not been pretreated with an anti-felt finish, and which is normally only slightly below 80 ° C.
• Draw capacity for the most important treatment agents to be permanently applied to the fiber with reactive dyes temperatures even lower than in the conventional case when using metal complex compounds, for example in the range between 60 ° and 75 ° C, and thus a very large group of people who not only covers the textile industry, namely also individual households, a widely applicable dyeing technique for wool articles to shoot.
• an aqueous liquor containing the dissolved reactive dyes is added to the fiber material made of wool or wool-containing fiber mixtures with the addition of 4 to 10% (based on the weight of the dry wool) of at least one acid and / or acid Salt acts at temperatures between 55 ° and 70 ° C, preferably between 60 ° and 68 ° C.
• the dyeing process is completed in 45 to 90 minutes.
• the dyeings that can be achieved are perfectly irrelevant and dyed through. In this respect, it could not have been foreseen that the setting of certain acidic conditions by the addition of acid to pH values of 1.8 to 3.5, preferably 2.4 to 3, would allow the temperature in the new dyeing process to be reduced. The lowering of the dyeing temperature is considerable.
• the advantages of the new process are also excellent extraction of the dye bath, levelness of the dyed wool, protection of the fibers and energy saving.
• the level of authenticity of the dyeings is naturally higher when using reactive dyes than, for example, in the case of acid dyes or wool dyes.
• the entire color range can also be produced on wool according to the invention; it can be used to produce both brilliant and muted shades.
• the disadvantages of the method according to the prior art from DE-B-28 45 516 are that no brilliant shades can be achieved when using metal complex dyes.
• metal complex dyes cannot be dyed in the pull-out process at temperatures around 60 ° C: on the one hand, the low drawing power of this dye class is not sufficient under these conditions to achieve economical dyeing, and then the levelness in such a case is even The dye is completely insufficient. It should not be forgotten that in connection with metal complex dyestuffs, a possible waste water pollution due to the metal content is more important than when using reactive dyestuffs for this task.
• Suitable reactive dyes for carrying out the process according to the invention are all chemical compounds listed in the Color Index, 3rd edition 1971 and supplements 1975 under the generic term “reactive dyes”, which covalently bond with fibers containing OH groups and / or NH groups are able to accept.
• organic and inorganic acids or salts thereof are taken into account in the process.
• organic acids used are: tartaric acid (8%), succinic acid (10%), amidosulfonic acid (7%); on inorganic acids, sulfuric acid (4%) or salt potassium hydrogen sulfate (9%) are suitable.
• the numbers in brackets are the predominant amounts of such acidic agents, based on the weight of the goods.
• the leveling agents customary for dyeing wool with reactive dyes are generally of a nonionic or anionic nature, e.g. Alkylene oxide adducts with fatty amines or condensation products from naphthalenesulfonic acids and formaldehyde are also used.
• the fastness properties of the dyeings produced in the claimed dyeing process correspond to those of whale dyes if no post-treatment operation is carried out after the dyeing process has ended.
• an aftertreatment following the actual dyeing operation which without prior drying of the dyeing at pH values from 8 to 9, preferably pH 8.5, and at temperatures from 40 ° to 70 ° C. for a period of 10 to 20 minutes, preferably 15 minutes, a fastness level is achieved which corresponds to that of dyeings with selected reactive dyes, dyed under cooking temperature conditions.
• This optionally supplementary measure exposes the dyed goods to the influence of a weakly alkaline medium, which can be accomplished in an optionally fresh, aqueous bath with the participation of 1 to 2 g / 1 of soda or by means of a dilute aqueous solution of ammonia.
• the applied amount of ammonia in this case varies between 0.1 and 3 cm3 / 1, preferably (25% strength) are added 0.5 to 2 cm 3/1 ammonia.
• the low temperature dyeing process for wool fibers according to the present invention mainly comes to normal, i.e. wool that is not felt-free or has a low-felt finish or fiber mixes constructed in this way.
• the dyebath and the fabric heat up to 60 ° C in one go (without the slow warming of 1 ° C per minute that is otherwise common with wool dyeing) and dye the fabric for 1 hour at this temperature.
• the wool material dyed in this way is then aftertreated in a fresh, aqueous bath with the addition of 1.5 g / l of soda at 70 ° C. for 20 minutes, rinsed warm and cold with water and finished.
• a rich, full yellow dyeing is obtained on the wool, which has very good wash fastness properties in mechanical washing according to DIN 54 014 (40 ° C) and according to DIN 54 013 (50 ° C) and has good alkaline fastness to perspiration according to DIN 54 020 .
• aqueous bath with the help of 1 g / 1 soda for 20 minutes at 70 ° C and rinsed with water warm and cold.
• a gold-yellow dyeing with very good wash fastness properties is obtained on the wool fabric.
• the machine's automatic system warms up to a temperature of 60 ° C and the dyeing process continues for 1 hour under these changed conditions.
• the article thus dyed is treated for 20 minutes at 70 ° C. in an aqueous bath with the addition of 1 g / l of soda and rinsed with water.
• the perfectly colored non-woven article has a blue color with very good fastness properties.
• the flawlessly dyed goods result in a very brilliant, bright scarlet color with very good fastness properties.
• the yarn is brown in color with very good fastness properties.

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Cited By (4)

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Citations (5)

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• 1985
  • 1985-02-26 DE DE19853506654 patent/DE3506654A1/de not_active Withdrawn
• 1986
  • 1986-02-15 EP EP86101937A patent/EP0193053A3/fr not_active Withdrawn

Patent Citations (5)

Non-Patent Citations (3)

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