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
  • D06P1/44—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 using insoluble pigments or auxiliary substances, e.g. binders
  • D06P1/64—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 using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
  • D06P1/651—Compounds without nitrogen
  • D06P1/65106—Oxygen-containing compounds
  • D06P1/65118—Compounds containing hydroxyl groups
• • 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
  • D06P5/12—Reserving parts of the material before dyeing or printing ; Locally decreasing dye affinity by chemical means
• • 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
  • D06P5/15—Locally discharging the dyes
  • D06P5/155—Locally discharging the dyes with reductants

Definitions

• etching agents which contain reducing agents, e.g. according to DE-PS 2 753 696, a mixture of an ammonia derivative which has at least one residue of an alkali metal or ammonium salt of methanesulfinic acid and glucose and, according to the process of DE-OS 31 06 036, a mixture of alkali or ammonium salts of hydroxymethanesulfinic acid and Hexamethylenetetramine.
• Reducible dyes are used for the base coloring, which are to be destroyed as completely as possible by the etching agents. To achieve colorful effects, non-reducible dyes are used, which must not be attacked by the etchant.
• the reducing etchants most often used in the known methods still have disadvantages.
• destruction of the so-called "etch-resistant" illumination dyes by strong reducing agents is observed, while on the other hand, when using weaker reducing agents, especially in deep-colored funds, the base dyes are not completely destroyed. This leads to cloudy printing.
• the printing pastes containing etching agents also have insufficient stability as a result of premature decomposition of the reducing agent and / or partial destruction of the so-called “etching-resistant” illumination dye.
• the invention has for its object to provide a method for printing synthetic fibers made of polyester, triacetate, acetate and polyacetate and their mixtures with one another with disperse dyes by the etching or etching reserve method, in which one can fall back on more stable etching-containing printing pastes and in which it is possible to achieve clearer nuances of the illumination dyes on deep-colored bases than is possible with the known processes.
• Textile e.g. Woven or knitted fabrics made of polyester, cellulose triacetate, cellulose acetate and polyamide or mixtures thereof. Textiles made from the materials mentioned are commercially available.
• the etching reserve process can be carried out, for example, by first padding the textile material with a liquor which contains an etchable disperse dye. Instead of padding, the textile material can also be printed with a printing paste which contains an etchable disperse dye and a synthetic or natural thickener. The textile material is then dried under conditions such that the dyes are not yet fixed. Then it is printed with a mixture of an etch-resistant disperse dye and the etchant mixture and dried. The dyes are then fixed, e.g.
• the etchable dye is destroyed at the locations on which the mixture of the etch-resistant dye and the etchant has been printed. This procedure is called the etching reserve because the base of the goods is colored, but the dye is not yet fixed.
• a variant of the etching reserve method is that the mixture of etch-resistant dye and etchant is printed on the textile and immediately afterwards the etchable dye is overprinted over the entire surface and the material is then dried and the dyes are fixed.
• an etchable dye that has already been fixed on the tissue is etched with the etchant mixture according to the pattern.
• White etching is also possible with all process variants, i.e. In this case, a printing paste is used which contains the etchant mixture but does not contain any dye.
• the etchant mixture contains as component a) at least one compound of the formula I or an alkali metal or ammonium thiocyanate.
• the compounds of formula I are known, sometimes even large-scale products.
• Preferred compounds of formula I are the sodium, potassium or ammonium salts of anthranilic acid and phenylglycine.
• Compounds of formula II are e.g. known from DE-PS 1 104 484. They can be produced using known methods, e.g. by reacting the compounds of the formulas I with sodium hydroximethanesulfinate.
• the etchant mixture contains, for example, an alkali or ammonium salt of anthranilo-N-methanesulfinic acid or N-phenylglycino-N-methanesulfinic acid (compounds of the formula II).
• an alkali or ammonium salt of anthranilo-N-methanesulfinic acid or N-phenylglycino-N-methanesulfinic acid compounds of the formula II.
• the sodium and potassium salts are used as alkali salts. It is of course also possible to use mixtures of sodium and potassium salts or of sodium and ammonium salts of the compounds of the formulas I, II and thiocyanic acid.
• the etchant mixture can also contain a water-soluble hydroxymethane or hydroxyethanesulfinate as component b).
• a water-soluble hydroxymethane or hydroxyethanesulfinate as component b).
• Suitable reducing agents are also ammonia derivatives which contain at least one residue of an alkali metal or ammonium salt of methanesulfinic acid or ethanesulfinic acid.
• ammonia derivatives are prepared in a known manner by reacting ammonia or its derivatives which carry at least one hydrogen atom bonded to nitrogen with alkali metal or ammonium salts of hydroxymethanesulfinic acid or hydroxyethanesulfinic acid (compounds of the formula III). This reaction proceeds with the elimination of water.
• sodium and potassium salts of the ammonia derivatives of methanesulfinic acid for example sodium iminodimethanesulfinate, which has the formula has and is prepared by reacting ammonia with sodium hydroxymethanesulfius in a molar ratio of 1: 2 and the compound of the formula which is obtained by reacting ammonia with the sodium salt of hydroxymethanesulfinic acid in a molar ratio of 1: 1.
• component b) it is also possible to use mixtures of the different water-soluble compounds containing sulfinic acid groups, and also in particular to use the compounds of the formula II together with a salt of thiocyanic acid, e.g. Mixtures of an alkali or ammonium salt of thiocyanic acid with an alkali or ammonium salt of anthranilo-N-methanesulfinic acid or N-phenylglycino-N-methanesulfinic acid. At least 100 g of water-soluble compounds dissolve per liter of water at a temperature of 20 ° C.
• Water-insoluble alkaline earth metal salts of compounds of the formula are used as component c) of the etchant to be used according to the invention in which R represents H or a C 1 - to C 3 -alkyl group.
• water-insoluble means that less than 2.5 g of the alkaline earth metal salt can be dissolved in 1 liter of water at a temperature of 20 ° C.
• the calcium salts of sulfinic acid ie the calcium salts of hydroxymethanesulfinic acid, hydroxyethanesulfinic acid, hydroxypropanesulfinic acid or hydroxylbutanesulfinic acid, are preferably used.
• mixtures of the alkaline earth metal salts for example mixtures of the calcium salts of hydroxymethanesulfinic acid and hydroxyethanesulfinic acid or mixtures of the calcium salt of hydroxymethanesulfinic acid and the barium salt of hydroxymethanesulfinic acid or mixtures of the calcium salt of hydroxymethanesulfinic acid and the barium salt of hydroxyethanesulfinic acid.
• the water-insoluble alkaline earth metal salts of component c) of the etchant mixture can be brought into a finely divided form by grinding (dry and preferably wet grinding in the presence of a dispersant) and optionally sieving the ground material.
• the particle size of the water-insoluble salts is preferably below the clear width of the screens of the printing stencils, ie below 0.15 mm, preferably in the range from 0.01 to 0.15 mm.
• Carbohydrates or their derivatives are used as component d) of the etchant used according to the invention.
• Mono- or disaccharides are particularly suitable as carbohydrates and ascorbic acid in particular as carbohydrate derivatives.
• the monosaccharides are e.g. for tetrosis such as erythrosis, especially pentoses such as xylose, arabinose, ribose and in particular hexoses such as glucose, fructose, sorbose, gulose, rhamnose, galactose, mannose and fucose. Lactose, maltose, cellobiose and reducing dextrin types are particularly suitable as disaccharides.
• Glucose both 1-glucose and d-glucose, also called dextrose, d-fructose, lactose, maltose, cellobiose, dextrin and ascorbic acid and their mixture are preferred.
• dextrose adenosine triphosphate
• d-fructose adenosine triphosphate
• lactose adenose
• maltose maltose
• cellobiose cellobiose
• dextrin dextrin
• ascorbic acid e.g. from fructose and glucose
• the printing paste with which the etchant mixture is printed on the textile material usually contains thickeners to adjust the viscosity. It is preferred to use natural thickeners, such as powdered meal ether, starch-tragacanth thickeners and alginates.
• 1000 parts by weight of the printing paste containing caustic contains 10 to 400 parts by weight of the caustic mixture and 20 to 100 parts by weight of the natural thickener.
• synthetic thickeners which are known to be sensitive to electrolytes, but because of the electrolyte content of the etching printing paste, higher amounts are usually required than usual.
• Suitable synthetic thickeners are, for example, high molecular weight polycarboxylic acids, e.g. Polyacrylic acid, polyacrylic acid crosslinked with crosslinking agents and copolymers of ethylene and acrylic acid or copolymers of styrene or ethylene and maleic anhydride.
• the synthetic thickeners develop their effectiveness in the pH range above 6. It is also possible to use mixtures of natural and synthetic thickeners. 1000 parts by weight of the printing pastes contain 0.5 to 50 parts by weight of a disperse dye or a mixture of disperse dyes.
• the printing pastes containing the etchant may also have other additives, e.g. Foam damper, fixative, urea, Xtz auxiliaries, such as Anthraquinone, solvents such as e.g. Biscyanethylformamide, thiodiglycol, glycerin or polyalkylene glycols or substances that either already produce an alkaline pH in the printing paste, e.g. Alkali hydroxides, alkali carbonates or hydrogen carbonates, ammonia, triethanolamine or urotropin or alkali donors, i.e. Agents which release alkali during the fixing process, e.g. the sodium salt of trichloroacetic acid.
• the pH of the printing pastes containing caustic is usually between 7.5 and 13, preferably between 8 and 12.5.
• the process according to the invention is characterized in that even when a small amount of an etch-resistant dye is printed on together with the etchant on a deep-colored fund, clearer nuances of the illuminating dye are obtained than was previously the case.
• the process according to the invention also gives sharp prints.
• the printed fiber materials, especially polyester, suffer little or no fiber damage.
• the printed material is dried and then treated for 10 minutes at a temperature of 170 ° C. with superheated steam under normal pressure.
• the material is then rinsed and reductively cleaned as usual. You get a yellow print on a black background.
• the print is characterized by a clear color and sharp contours.
• the printed material is then dried and then treated for 8 minutes at a temperature of 175 ° C. with superheated steam under normal pressure. Then it is rinsed and cleaned reductively as usual. You get a clear blue print on a black background.
• the printed material is dried and then treated for 12 minutes at a temperature of 175 ° C. with superheated steam under normal pressure.
• the material is then rinsed and reductively cleaned as usual. The result is a clear, yellow, crisp print on a black background.
• the printed material is dried and then treated with saturated steam at a temperature of 102 ° C. under normal pressure for 20 minutes. Then it is rinsed cold, soaped at 30 to 40 ° C, rinsed and dried. You get a sharp, deep pink print on a black background.
• the printed material is dried and then treated for 10 minutes at a temperature of 170 ° C. with superheated steam under normal pressure.
• the material is then rinsed and reductively cleaned as usual. You get a sharp pink print on a blue background.

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

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• 1984
  • 1984-01-18 DE DE19843401500 patent/DE3401500A1/de not_active Withdrawn
  • 1984-12-15 DE DE8484115523T patent/DE3478624D1/de not_active Expired
  • 1984-12-15 EP EP84115523A patent/EP0150405B1/fr not_active Expired

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