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
  • D06P3/32—Material containing basic nitrogen containing amide groups leather skins
  • D06P3/328—Material containing basic nitrogen containing amide groups leather skins preparing non-azo dyes on the material
• • C—CHEMISTRY; METALLURGY
  • C14—SKINS; HIDES; PELTS; LEATHER
  • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
  • C14C3/00—Tanning; Compositions for tanning
  • C14C3/02—Chemical tanning
  • C14C3/08—Chemical tanning by organic agents
• • C—CHEMISTRY; METALLURGY
  • C14—SKINS; HIDES; PELTS; LEATHER
  • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
  • C14C3/00—Tanning; Compositions for tanning
  • C14C3/02—Chemical tanning
  • C14C3/08—Chemical tanning by organic agents
  • C14C3/10—Vegetable tanning
• • C—CHEMISTRY; METALLURGY
  • C14—SKINS; HIDES; PELTS; LEATHER
  • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
  • C14C3/00—Tanning; Compositions for tanning
  • C14C3/02—Chemical tanning
  • C14C3/08—Chemical tanning by organic agents
  • C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
  • C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
• • 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
  • D06P1/34—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 natural dyestuffs
• • 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
  • D06P3/32—Material containing basic nitrogen containing amide groups leather skins
  • D06P3/3206—Material containing basic nitrogen containing amide groups leather skins using acid 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
  • D06P3/32—Material containing basic nitrogen containing amide groups leather skins
  • D06P3/3273—Material containing basic nitrogen containing amide groups leather skins preparing azo dyes on the material

Definitions

• the present invention involves compositions intended to simultaneously tan and dye hides and their production process.
• tanning extracts for certain specific colours, for example: campeach wood extracts which provide colours ranging from red to black; the campeach hematin contained in the same extract provides a wine dregs red colour; the campeach nigrosine which produces a black colour; the chestnut (Castanea Vesca) which provides a brown colour verging on green; the pine and oak which provide a red colour; the taras which provide a grey colour; the tara hematins which provide a black colour; the gall which produces a light tan colour; and the cochineal which produces a red colour.
• campeach wood extracts which provide colours ranging from red to black
• the campeach hematin contained in the same extract provides a wine dregs red colour
• the campeach nigrosine which produces a black colour
• the chestnut which provides a brown colour verging on green
• the pine and oak which provide a red colour
• the taras which provide a grey colour
• tanning techniques they rely on the penetration of the tanning extracts mentioned above, in the hides and their subsequent fixation with organic acids or metal salts enabling the colour to cross the hides while obtaining treated surfaces on the finished leather.
• tanning-dyeing compositions using natural, recyclable, very abundant tanning agents with a heterogenous or indefinite composition that have a non saturated molecular structure, that is, are electronically unstable, which have the function of the chromophore group.
• This market currently uses natural pyrogallic or pyrocatechic extracts, whether modified or not, which tan by giving the finished leather its natural colour.
• the most common are derived from mimosa (light caramel colour), quebracho (reddish-brown colour), chestnut (greenish-brown colour), pine (red colour), oak (red colour) and tara (light tan colour).
• These tanning products give leather their natural colour which does not sufficiently please the user, easily becomes oxidized and requires an anti-economic dyeing process when compared with chrome-aluminium tanning products which provide equivalent results with 75% less.
• tanning-dyeing compositions in the present invention has the following advantages:
• compositions to simultaneously tan and dye hides and obtain directly dyed leathers includes at least one tanning compound, able to form chromophore groups, consisting of at least one member of the group formed by: the natural pyrocatechic derivatives of quebracho, mimosa and acacia and their tannic acids; the natural pyrogallic derivatives of tara, carob and their tannic acids; naphthalene sulphonic acid condensed with formaldehyde; naphthalene-1 sulphonic acid; phenolsulphonic acid; phenolsulphonic acid condensed with formaldehyde; gallic acid and at least one coupler able to provide the final colour with the chromophore groups of the tanning compound, belonging to the group formed by: triphenyl-methane-sulphonic acid; aniline; p-amine-aceto-aniline; urea-1 acid; p-amine-salicylic acid; di-
• Triphenyl-methane-sulphonic acid 0.3 to 1.5% Aniline 0.5 to 9% P-amino-aceto-aniline 0.01 to 1.5% urea-1 acid 3 to 9% P-amine-salicylic acid 2 to 7% Di-nitro-styrene-sulphonic acid 1 to 2% P-sulphanilic acid 0.02 to 9% P-nitro-aniline 0.2 to 10% Phenolsulphonic acid 0.01 to 8% Benzidine H 0.3 to 6% Benzaldehyde 1 to 7% N,N-dimethylaniline 1 to 11% o-dianisidine CH-CH 0.5 to 4%
• the components providing the final touch may be chosen from the group formed by the compounds indicated below. These compounds are present, if necessary, within the following percentage limits: Trinitril-penta-acetate of aluminium, copper, iron and/or zinc 0.01 to 2% Ethylenediamine-tetracetic acid and its iron, copper and aluminium salts 0.07 to 2% Double oxalate of titanium and potassium 1 to 7% Sulphates of aluminum, iron and copper 1 to 6% Diethylenetriamine-pentacetate of zinc or aluminium 0.01 to 3%
• the products providing the colour are chosen from the group of dyes mentioned below which are found within the following percentage limits: Orange II 0.01 to 0.3% Bismarck brown 0.1 to 0.5% EW black (Direct black 38) 0.5 to 3% Victoria blue (Direct blue 12) 0.01 to 3% R red (Acid red 85) 0.5 to 1% Auramine 0.02 to 0.2% Malachite green 0.02 to 0.2%
• oxidizing agents that may possibly be found in the compositions in the invention, it is necessary to indicate that the latter are chosen from the group mentioned below and that those present are within the percentage weights indicated: potassium perchlorate 0.02 to 5% potassium chlorate 0.08 to 2% hydrogen peroxide 1 to 6% chlorate of soda 0.02 to 5%
• auxilliary compounds which form the optional compounds of the compositions in the present invention, they are chosen from the group indicated below and are respectively found within the following percentage limits:
• the different compounds and their percentage in weight are chosen so that the sum of the weight percentages in which all of the compounds in the composition are present is equal to 100%.
• compositions to simultaneously tan and dye hides may be produced according to the process consisting of treating an aqueous solution of a tanning compound belonging to the group indicated above, with derivatives of naphthalene sulphonic acid whether condensed with formaldehyde or not; adding substances which include nitro, azo, nitrous, azoxy, carbonic and/or quinoid groups in their molecule; oxidizing these groups, if necessary, by incorporating air under pressure; coupling the chromophore base obtained by means of the addition of at least one of the couplers mentioned above; incorporating, if necessary, the auxochrome, carboxyl, hydroxy and amine auxilliary compounds; solubilizing the tanning-dyeing extract obtained by sulphitation with sodium sulphite, sodium bisulfite and/or sulphuric acid; concentrating the product obtained until there are approximately 50% solids; graduating, if necessary, with complex metal salts and/or
• the aqueous solution of the tanning compound is 6° Be, and was cooled to a temperature of not more than 5° C while the substances containing the nitro, azo, nitrous, azoxy, carbonic and/or quinoid groups in their molecule, are added at atmospheric pressure.
• the concentration of the product obtained, following the optional addition of auxochrome, carboxyl, hydroxy and amine auxilliary compounds, and the solubilization of the tanning-dyeing extract by sulphitation with sodium sulphite, sodium bisulphite and/or sulphuric acid, is carried out in a vacuum and at a temperature of 10 °C.
• the final drying of the composition obtained is carried out by passage through a drying chamber and spraying, at an admission temperature of 220 °C and an outlet temperature of 90° to 95°C.
• the final product has the following approximate composition: Tannins 50 to 69% Non tannins 21 to 30% Insolubles 0.0 to 2.3% Ashes 5.5 to 10% Water 6.0 to 6.5% pH at 10% 5.6
• compositions provide leathers dyed tan, orange, brown, red, blue, green and black. It should be noted that subsequent oxidation is generally not required in order to obtain green, red and blue colours.
• Base A is thereby prepared. It is used to obtain the following colours by adding the substances indicated and following the method recommended below:
• compositions are obtained as follows according to the invention: Add 7% condensed naphthalene sulphonic acid to 16,000 kg of pyroacechic tannic solution. Stir for 30 minutes and add 10 to 25% sodium acid sulphate. Control the total solubility and dry. This provides a compound called Base B.
• this base In addition to its use in the preparation of synthetic extracts used in dyeing, this base also has a fixing power on other tanning products, either at the end of traditional tanning or for light tan colours.
• the hides When the hides are intended for sale by weight, they are dyed but not oiled, left to rest and covered for 24 hours, then drained and loaded with 1% magnesium sulphate and glucose, kept dry for 30 minutes and treated with 1% phosphated oil, 1% raw neat's foot oil and 10% water at 40°C. Continue the operation until absorption.
• the hides are soaked without stirring with a quantity of water 400% of the dry weight for 5 hours. They are then treated with a solution consisting of: Water 400% Sodium polysulphide 2% Moistener 0.3% for 14 hours. Then incorporate 0.01% fungicide. Complete soaking, wash and shave.
• pancreatic proteinase (15 UW) for 45 minutes and then check the total deliming. Then wash for 30 minutes.
• wash with acidified water at pH 4 unload and allow to rest for 24 hours. Dry and continue according to the rules of the art.
• pre-tan in the same bath by treating with 5% tinctorial extract for 30 minutes and then with 5% of the same type of extract for 90 to 120 minutes with a 2/3 penetration in the hide. Unload, allow to rest while covered for 24 hours, drain and trim to 2 tenths below the desired thickness.
• the tanning is carried out in the same bath. Treat with 10% of the aforementioned extract for 30 minutes. Check the total and regular passage at pH 3.8 and treat with 0.3% formic acid. Then wash with 200% water at 30 °C and pH 3.8. Wash again if necessary.
• Tinctorial extract solution (12 °Be) 150% Tinctorial extract 10%
• Tinctorial extract 10% Sulphited fish oil 1%
• Tinctorial extract 5% Lubricant 0.1% Tinctorial extract 5%
• Then maintain at a temperature of about 30 °C for approximately 10 hours. Open the rammer, leave the door open and allow to rest for 5 hours in this position;

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3478826

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (2)

• 1992
  • 1992-10-21 ZW ZW168/92A patent/ZW16892A1/xx unknown
  • 1992-10-21 ZA ZA928144A patent/ZA928144B/xx unknown
  • 1992-10-26 EP EP92402905A patent/EP0543689A1/fr not_active Withdrawn
  • 1992-10-27 BR BR929204168A patent/BR9204168A/pt not_active IP Right Cessation

Patent Citations (2)

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