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
  • 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
  • D06P1/0004—General aspects of dyeing
• • 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
  • D06P3/6025—Natural or regenerated cellulose using vat or sulfur 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
  • Y10S8/916—Natural fiber dyeing
  • Y10S8/918—Cellulose textile

Definitions

• the present invention relates to a method for dyeing textile cellulose materials with vat dyes by means of a metering device and to the cellulose material dyed by means of this method.
• the fiber levelness in particular the outside / inside levelness of bobbins, is significantly increased using a process in which the chemicals required for the dyeing process are introduced and then the dye or the stock is added to the dye bath.
• the present invention therefore relates to a process for dyeing cellulosic fiber materials, characterized in that the for Completely or partially submits the auxiliary chemicals required in the dyeing process to the dye bath, then metered the vat dyes or their leuco compounds with the aid of a metering device over a period of time to the dye bath at temperatures of 20 to 100 ° C and then dyed the fiber material at the same or elevated temperature.
• the dye or the leuco compound is expediently metered in continuously over a certain time interval until a sufficient amount of dye has been added for the respective dyeing process.
• the metering can be linear, on the one hand, i.e. that the same amount of dye is always added in the dosing phase in every time interval.
• Another possibility is the degressive dosing of the dye, i.e. the amount added per unit of time is very large at the beginning of the dosing phase, but then decreases more and more as the dosing time progresses.
• the dosage can also be progressive, i.e. the amount added per unit of time is very small at the start of the dosing phase, but then increases as the dosing time progresses.
• the dye or the leuco compound is advantageously metered directly into the liquor circuit, preferably with automatically controlled devices.
• liquid dosing e.g. pneumatic or electrically driven piston diaphragm pumps.
• These pumps are equipped with a microprocessor control unit with which the control parameters necessary for the respective dyeing process, such as the amount of dye to be metered, the metering time, the "degressivity” or the “progressivity” can be set.
• the control units can also be equipped with fixed dosing programs.
• vat dyes added to the dyebath these are expediently used as finely divided dispersions which are obtained by grinding in the presence of customary dispersants.
• dye dispersions in which the raw dye is only coarsely ground for homogenization, small amounts of nonionic and / or anionic dispersants being used as grinding aids (dye in coarsely dispersed form).
• the viscosity is adjusted using commercially available thickeners, preferably based on polymeric acrylic acid, set to values between 1x103 - 2x104 mPas.
• Anionic or nonionic surfactants can be used as dispersants, which can be present alone or as mixtures with one another or consisting of an anionic and a nonionic surfactant.
• the anionic surfactants are normally in the form of their alkali metal salts, ammonium salts or amine salts.
• Aromatic sulfonic acids such as e.g. Oxiligninsulfonic acid or formaldehyde condensation products from aromatic sulfonic acids, formaldehyde and optionally mono- or bifunctional phenols such as. B. from cresol, ⁇ -naphtholsulfonic acid and formaldehyde, from benzenesulfonic acid, formaldehyde and naphthalenesulfonic acid or from naphthalenesulfonic acid, dihydroxydiphenyl sulfone and formaldehyde.
• Oxiligninsulfonic acid or formaldehyde condensation products from aromatic sulfonic acids, formaldehyde and optionally mono- or bifunctional phenols
• B. from cresol, ⁇ -naphtholsulfonic acid and formaldehyde, from benzenesulfonic acid, formaldehyde and naphthalenesulfonic acid or from naphthalenesul
• Untreated cellulose is particularly suitable as cellulose material, e.g. Hemp, linen, jute, native cotton, as well as fiber blends e.g. those made of polyacrylonitrile / cotton or polyester / cotton, and fiber materials based on regenerated cellulose (viscose) are also suitable.
• the cellulose material can be in a wide variety of processing forms, e.g. as loose material, yarn, woven or knitted fabric. Cotton which is processed as yarn is preferably suitable for the process according to the invention.
• the dyeing of the cotton is dyed in the form of the skein, the pressed or non-pressed cheese or the warp beam.
• all dyeing methods can be used in which dyeing is carried out with a moving liquor and standing fiber material.
• the dyeing of the fiber material is preferably carried out in the form of the cheese.
• the spools for the dyeing process are placed on perforated metal spindles or triangular spindles into which the liquors are pressed. Further details on the dyeing of yarn and the apparatuses required for this can be found in H. Rath, "Textbook of Textile Chemistry", 3rd edition, p. 642 ff (1972).
• vat dyes are higher fused and heterocyclic benzoquinones or naphthoquinones and in particular anthraquinone or indigoid dyes.
• vat dyes used according to the invention are listed in the Color Index 3rd Edition (1971) Vol. 3 on pages 3649 to 3837 under the name "Vat Dyes”.
• the amount of dyes added to the dye liquor depends on the desired color strength. In general, amounts of 0.01 to 10, preferably 0.05 to 3 percent by weight, based on the cellulose material used, have proven successful.
• the dyeing liquors contain the auxiliary chemicals common for vat dyeing.
• Alkali such as sodium carbonate, potassium hydroxide, sodium hydroxide or alkali dispenser such as e.g. Sodium chloroacetate into consideration.
• Sodium hydroxide is preferably used.
• the reducing agents should also be mentioned, preferably using hydrosulfite.
• the dyeing liquor can also contain other customary dyeing auxiliary products, such as Electrolytes such as sodium chloride or sodium sulfate or commercially available wetting, leveling and dispersing agents. These auxiliary chemicals are added to the dye bath completely or only partially before the actual dyeing process; if the addition is only partial, the rest is added with the dye or the leuco compound.
• auxiliary chemicals such as Electrolytes such as sodium chloride or sodium sulfate or commercially available wetting, leveling and dispersing agents.
• the dyeings are advantageously carried out from an aqueous liquor using the exhaust process.
• the liquor ratio depends on the equipment, the substrate and the form of presentation. However, it can be chosen within a wide range, e.g. 1: 4 to 1: 100, but is usually between 1: 6 to 1:15.
• the dyeing process according to the invention can be carried out at temperatures from 20 to 110 ° C. will.
• the temperature is preferably between 30 and 100 ° C or 30 and 80 ° C.
• the dyeing process is expediently carried out in such a way that all chemicals are placed in the dyeing liquor and the fiber material is pretreated at a temperature of 20 to 100 ° C., preferably 20 to 80 ° C.
• the lead time is 5 to 20, preferably 5 to 15 or 5 to 10 minutes.
• the total amount of dye is then metered in linearly, degressively or, if appropriate, progressively at the same and constant temperature over a period of 15 to 40, preferably 20 to 40 minutes.
• the temperature of the dyebath is then increased to 60 to 110 ° C. in the course of 15 to 25 minutes, with a corresponding constant heating rate, and dyeing is carried out for 30 to 60 minutes at the final temperature reached.
• the coloring can also be isothermal, i.e. be carried out at constant temperature. After staining, cool to 50 to 70 ° C.
• the dyed fiber material is rinsed and oxidized as usual, with hydrogen peroxide usually being used for the oxidation.
• the dyed cellulose material is soaped in the usual way.
• the substrate is treated at cooking temperature in a solution which contains soap or synthetic detergent and optionally sodium carbonate.
• the process according to the invention gives uniform and vivid colorations which are distinguished by good dye yields.
• level dyeings are achieved, the cellulose material showing a calm appearance and having good light and wet fastness properties.
• the percentages always relate to the weight, unless stated otherwise.
• the amounts of the dyes relate to commercial, i.e. coupé goods and with the aids on pure substance.
• the pretreatment time (lead time) is 10 minutes at 40 ° C. It is driven with one-sided inside / outside circulation. The flow rate is approx. 7 l / kg / min.
• the dyeing is then carried out in the same bath.
• the process is one-sided inside / outside circulation.
• the following dye mixture is used: 3.25 g of the dye of the formula (102) 4.05 g of the dye of the formula and 5.40 g of the dye of the formula
• This dye mixture is dispersed with 11 g of oxilignin sulfonate in 2 liters of water.
• one of the dye dispersions of Examples 1 to 3 can also be used.
• the liquor is heated to 40 ° C.
• the dispersed dye mixture is metered in linearly at a temperature of about 60 ml / min within 30 minutes.
• the mixture is then heated to 80 ° C at a heating rate of 1.5 ° C / minute.
• the dyeing is continued for 45 minutes at this temperature and then allowed to cool to 60 ° C. at a cooling rate of 2 ° C./minute.
• the dyed fiber material is then removed from the dyeing machine and oxidized with hydrogen peroxide. The coloring is then completed in the usual way.
• Example 4 The procedure is as described in Example 4, with the difference that in the liquor is replaced by 200 ml of sodium hydroxide solution and 40 g of hydrosulfite instead of 300 ml of sodium hydroxide solution and 60 g of hydrosulfite, and an additional 100 ml of sodium hydroxide solution and 20 g of hydrosulfite are added to the dye mixture, and the resulting leuco form is metered in.
• the mixture is taken in at 40 ° C. and the liquor is heated to 110 ° C. within 30 minutes. At this temperature, treatment is continued for a further 30 minutes and the temperature is then reduced to 85 ° C. within 15 minutes. The goods are then rinsed in the usual way.
• the pretreatment time is 15 minutes at a temperature of 80 ° C. It is driven with one-sided inside / outside circulation.
• the dyeing is then carried out in the same bath.
• the process is one-sided inside / outside circulation.
• the following dye mixture is used: 0.052% of the dye of the formula (104), 0.048% of the dye of the formula (105) 0.276% of the dye of the formula 0.040% of the dye of the formula
• This dye mixture is coarsely dispersed with 11 g of oxilignin sulfonate in 2 liters of water.
• the dispersed dye mixture is metered in linearly at a metering rate of approximately 120 ml / min within 15 minutes.
• the dyeing is isothermal for a further 30 minutes and then allowed to cool to 60 ° C. at a cooling rate of 1.5 ° / minute.
• the dyed fiber material is then removed from the dyeing machine and oxidized with hydrogen peroxide. The coloring is then finished as usual.
• the pretreatment time is 15 minutes at 90 ° C.
• a level coloring of the cross-wound bobbins is obtained.

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• 1991
  • 1991-07-30 EP EP91810606A patent/EP0470932A1/fr not_active Ceased
  • 1991-08-07 US US07/741,388 patent/US5176715A/en not_active Expired - Fee Related

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