WO2017153505A1 - Procédé d'ennoblissement du cuir - Google Patents

Procédé d'ennoblissement du cuir Download PDF

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Publication number
WO2017153505A1
WO2017153505A1 PCT/EP2017/055503 EP2017055503W WO2017153505A1 WO 2017153505 A1 WO2017153505 A1 WO 2017153505A1 EP 2017055503 W EP2017055503 W EP 2017055503W WO 2017153505 A1 WO2017153505 A1 WO 2017153505A1
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WO
WIPO (PCT)
Prior art keywords
solution
coat
hide
water
carried out
Prior art date
Application number
PCT/EP2017/055503
Other languages
German (de)
English (en)
Inventor
Uwe Holubeck
Original Assignee
Holupelli Consult Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Holupelli Consult Gmbh filed Critical Holupelli Consult Gmbh
Priority to CN201780015861.9A priority Critical patent/CN109072546A/zh
Publication of WO2017153505A1 publication Critical patent/WO2017153505A1/fr

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Classifications

    • 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
    • C14C3/22—Chemical tanning by organic agents using polymerisation products
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/44—Mechanical treatment of leather surfaces
    • C14B1/54—Ironing
    • 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
    • C14C11/00—Surface finishing of leather
    • C14C11/003—Surface finishing of leather using macromolecular compounds
    • 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
    • C14C11/00—Surface finishing of leather
    • C14C11/003—Surface finishing of leather using macromolecular compounds
    • C14C11/006—Surface finishing of leather using macromolecular compounds using polymeric products of isocyanates (or isothiocyanates) with compounds having active hydrogen
    • 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
    • C14C13/00—Manufacture of special kinds or leather, e.g. vellum
    • 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
    • C14C3/28—Multi-step processes
    • 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
    • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
    • C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
    • 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
    • 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
    • D06P1/52—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 synthetic macromolecular substances
    • D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
    • 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
    • D06P1/52—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 synthetic macromolecular substances
    • D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
    • D06P1/5285—Polyurethanes; Polyurea; Polyguanides
    • 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
    • D06P3/3293—Material containing basic nitrogen containing amide groups leather skins mineral dyeing

Definitions

  • the invention relates to measures for the treatment and refinement of leather.
  • a process for producing leather shrinkage comprising the following steps: a) washing at least one chromium-tanned coat (Chromewetblue) in a washing solution, b) neutralizing the treated coat in a neutralization solution, c) pre-lubricating the coat, d F) dyeing the coat in a dyeing solution, e) fatliquoring by addition of a fatliquoring mixture, f) fixation by addition of formic acid, g) final clay adjustment, h) fixation, i) washing of the coat, j) drying of the coat, k) application of a coat Binder mixture solution, 1) application of an aqueous emulsion varnish, m) ironing and cleats of the coat, n) walking of the coat under continuous moisture supply, o) dehairing of the coat, p) conditioning of the coat and further reduction of the moisture content and q) application of a fixation
  • the invention thus relates to a process for producing leather shrinkage comprising the following steps:
  • pre-fatting comprising incubating the coat with about 0.5% (w / w) solution of a fatty acid ester, about 2% (w / w) solution of a polymer tanning agent and about 20% (w / w) solution of a retanning agent;
  • greasing by addition of about 100% (w / w) water and about 4.5% greasing mixture, said greasing mixture comprising about 45% (w / w) long-chain paraffins and about 55% (w / w) sulfited oils;
  • binder mixture solution comprising binder mixture and an inorganic pigment dispersion in the ratio 4: 1, the binder mixture solution having about 40% (w / w) finely divided polyurethane dispersion and about 30% (w / w) modified polyurethane / acrylate copolymer emulsion;
  • Polyurethane dispersion wherein the polyurethane is 2-Isocyant crosslinked and a
  • concentrations in percent by weight relate to the shaved weight of the coat to be treated.
  • the term "about” is to be understood as meaning that the concentrations can deviate from the stated value by +/- 15%, preferably +/- 10% or preferably +/- 5%. However, particularly preferably, the concentrations correspond exactly to the values mentioned. This interpretation applies accordingly to quantities, times or temperatures.
  • Chromwetblue also a plurality of leathers, i. to understand two, three or more Chromwetblues, which are treated by the method according to the invention.
  • steps of the moist treatment ie steps a) to i) are preferably carried out in mobile vessels and preferably in rotatable vessels. Particularly preferred for this wood barrels are suitable.
  • the skins can be left in the same vessel for carrying out the individual process steps or transferred to a different vessel in each case.
  • drying steps used in the process can be carried out using vacuum drying techniques, hanging drying or drying tunnels. Walk and stretch treatments are preferably carried out by means of rolling machines.
  • the application of binder mixture solution in step k) and fixation solution in step q) is preferably carried out by means of a rotary sprayer.
  • step k) the application is carried out 2 to 3 times, wherein the binder mixture solution is applied in an amount of about 10-15 g per square foot. Subsequently, a filming by means of continuous dry tunnel at about 80 ° preferably takes place. The steps are preferably repeated 3 times.
  • step q it is preferable to apply the fixing solution in an amount of 10 mg per square foot.
  • Ironing steps are preferably carried out by means of a continuous ironing machine at about 80 ° C.
  • the tunnel is preferably carried out with a continuous roller machine.
  • non-ionic surfactant refers to a surfactant which contains no dissociable functional groups and which does not separate into ions in aqueous solution.
  • Non-ionic surfactants generally consist of a nonpolar and a polar part.As a non-polar part is usually a fatty alcohol (preferred chain length between C 12 and C 18) or octyl- or nonylphenols as polar groups it is possible to use a hydroxyl group or an ether group which are present, for example, in polyethylene glycol or monosaccharides
  • a "nonionic surfactant” in the sense of the invention is particularly preferably a polyalkylene glycol ether (fatty alcohol ethoxylates (FAEO), fatty alcohol propoxylates (FAPO), alkylglucosides, alkylpolyglucosides (APG), octylphenol ethoxylates or Nony lpheno lethoxy latex.
  • FAEO fatty alcohol ethoxy
  • a tanning agent in the context of the invention, a tanning agent is referred to, which consists of macromolecules, so-called constitutional repeating units or repeating units.
  • Acrylates and polyurethanes for example, can be used as base bodies for tanning-active, artificially produced polymers.
  • Aldehydes, isocyanates, isothiocyanates and succinimide esters can be used as reactive groups.
  • a polymer tanning agent in the context of the invention preferably consists of a condensate of aliphatic aldehydes and one or more compounds selected from the group consisting of urea, dicyandiamide, melamine and guanidine, particularly preferably a condensation product of dicyandiamide and formaldehyde.
  • Retanning is the post-treatment of pre-tanned, often chrome-tanned leather.
  • the retanning is preferably the emphasis on special Features of the type of leather, such as the optimization of color, grain fineness, grain firmness, softness, fullness, shape retention, weight of the leather, behavior against water (hydrophobicity) or the fixation of tannins.
  • Suitable retanning agents may be synthetic or natural substances, for example mineral tanning agents such as chromium, aluminum or zirconium, synthetic retanning agents such as naphthalene-phenol condensates, fats or aldehydes.
  • a "retanning agent" within the meaning of the invention is preferably a synthetic retanning agent, for example a naphthalene-phenol condensate product.
  • anionic dyes also called acid dyes
  • dyes are called having one or more acid residues, usually sulfonic acid residues, and raise from aqueous medium directly onto the fiber.
  • Anionic dyes are preferably used for dyeing polyamide fibers and wool on which they undergo electrovalent bonds with the amino group.
  • Anionic dyes typically have azo, nitro or anthraquinone chromophores.
  • Representative of the anionic dyes are, for example, naphthol yellow S and the patent blue dyes.
  • An "anionic dye in the context of the invention is preferably an anionic dye of the acidic substantive dye type, more preferably Congo red or benzopurpurin.
  • a "finely divided polyurethane dispersion” is preferably a free-flowing two-phase system consisting of water and a polymer, ie a dispersed plastic which belongs to the class of polyurethanes, for example isocyanates, polyols and polyamines, and optionally further components.
  • the polyurethane particles are typically present in a stable dispersion and are spherical formations in a size range between about 30 nm and 1000 nm, thereby providing a milky white appearance of the dispersion.
  • the size distribution can have both a maximum (monomodal) and two maxima (bimodal). Below 50 nm particle size, the dispersion appears increasingly transparent, above 1000 nm, the particles tend to settle.
  • the proportion by weight of the polyurethane solid in the dispersion is usually between 30% to 60%.
  • the so-called LD value light transmission value of the dispersion
  • the LD value is preferably measured by measuring the dispersion in 0.01% (w / w) aqueous solution in a 2.5 cm edge length cuvette with 546 nm wavelength light and measuring the permeability of water among the compares the above conditions. The permeability of water is given as 100%. The finer the dispersion, the higher the LD value measured by the method described above.
  • Preferred finely divided dispersions are also disclosed in the published patent applications EP 0 257 412 A1, WO 2010/139654 A2.
  • a "modified polyurethane / acrylate copolymer emulsion" in the context of the invention is preferably an emulsion of a polyurethane-acrylate copolymer having chemical modifications.
  • acrylate copolymer when a copolymer is referred to as acrylate copolymer, this is to be understood as meaning copolymers which have been copolymerized from acrylic acid or its derivatives. Included within the term acrylate within the meaning of the invention are also acrylamides, acrylic esters such as acrylic acetates, etc., but also copolymers in which the acrylate is the predominantly present polymer.
  • copolymers are copolymers derived from acrylic acid or methacrylic acid and derivatives thereof, such as amides and esters, in particular acrylic acid, acrylamides and acrylic esters. They may optionally contain basic comonomers, such as primary, secondary, tertiary or quaternary amino substituents, e.g.
  • Quaternization products of dimethylaminoethylmethacrylate or diallyldimethylammonium acrylic acid moieties ; hydrophobic substituents, such as long-chain alkyl groups having 10 to 30, preferably 12 to 24 carbon atoms, acidic substituents, such as sulfonate, phosphate and carboxyl groups or hydroxyl groups, such as vinyl alcohol.
  • Copolymers of vinylpyrrolidone / acrylate or dialkylaminoalkyl methacrylate are also suitable.
  • Polyurethanes also include polyurethane polyvinyl pyrrolidones, polyester polyurethanes, polyether polyurethanes and polyureas.
  • the polyurethane may be, for example, an aliphatic, cycloaliphatic or aromatic polyurethane, polyurea / urethane or polyurea copolymer.
  • Polyurethanes may also be prepared from straight or branched polyesters or alkyd compounds that have mobile hydrogen.
  • Chromwetblue tanned intermediate with a chromium oxide content of at least 1.5%) is used here.
  • Chromium tanning to produce chromium blues typically employs chromium (III) salts (chromium hydroxide). Corresponding methods are known in the art.
  • the dyeing is achieved at 50% water 20 ° C with 1.0% ammonia and anionic dyes, preferably acidic substantive dyes over 60 minutes at about 12 U / min and 60 ° in the same medium with the addition of 100% water 45% active ingredient content and sulfited oils approx. 55% active ingredient content in a ratio of 1: 1 over 40 minutes greased and by addition of 3.5% formic acid 85%> 60 Minutes fixed.
  • the final tone adjustment of the color is done in a fresh bath with 200% water at 50 ° C and an addition of anionic dyes of the acidic noun type for 60 minutes and is fixed by the addition of 0.5-1.0%) formic acid 85% for 20 minutes and completed.
  • the final pH is between 3.5 and 3.6.
  • the drying is initiated by an intensive wilting and stretching by means of commercial rolling machines. There is a predrying using vacuum technology at 60 ° C for 3 minutes and drying in a drying tunnel for 8 hours at 50 ° C. By intensively rewetting the leather matrix to> 50% water content, reconditioning of the fiber is achieved. This is followed by re-drying of the leather matrix to less than 15% water content by means of vacuum technology at 60 ° C. for 1-2 minutes and hanging drying for at least 8 hours at 40 ° C.
  • the intensive softening of the fiber is carried out by means of a commercial continuous roller machine with pen tools and is preparatory operation for the surface coating (dressing).
  • the finish consists of a mixture of finely divided polymers about 40% active ingredient content and finely divided polyurethane dispersions about 30% active ingredient content (modified polyurethane / acrylate copolymer emulsion), which their coloring by the addition of obtained inorganic pigment dispersions.
  • 400 parts of binder mixture are mixed with 100 parts of inorganic pigments and 350 to 400 parts of water.
  • the binder mixture is applied 2-3 times (10 to 15 g / square foot of leather) by means of a commercially available rotary sprayer on the leather surface and then filmed with a continuous ironing machine with 80 ° C. This operation is repeated 3 times.
  • an aqueous polyurethane-based emulsion varnish with about 25% (w / w) active ingredient content of about 10 g / square foot of leather, the dressing film is adjusted medium hard.
  • the ironing machine is then ironed at approx. 80 ° C.
  • an intensive fiber loosening is achieved, which represents a preliminary work for the subsequent walking in the Walk barrel.
  • the working process Walken is decisive for the expression of the wholegrain grain and the resulting leather surface (shrink optics).
  • Final setting of the shrinkage scars is achieved by applying 2-isocyanate crosslinked, aqueous, finely divided polyurethene dispersions (about 30%) in a mixing ratio of 30 parts binder in 100 parts water with an application rate of at least 10 mg / square foot of leather using a commercial grade Rotary sprayer achieved.
  • the leather shrinkage has a coat thickness of 2 to 3 mm, preferably 2.3 to 2.5 mm.
  • step a) is carried out at about 40 ° C. for about 30 minutes.
  • step b) is carried out at about 40 ° C. for about 150 min and a final pH greater than pH 6.0 in the solution is achieved.
  • the incubation time for the incubation of the coat in step c) with about 0.5% (w / w) solution of a fatty acid ester about 60 minutes, with about 2% (w / w) solution of a polymer tanning agent for about 40 minutes and with the about 20% (w / w) solution of a retanning agent for 60 minutes.
  • step e) is carried out for about 40 minutes.
  • step g) is carried out for about 60 minutes at about 50 ° C.
  • step h) is carried out for about 20 minutes and a final pH value between 3.5 and 3.6 in the solution is achieved.
  • step i) is carried out for about 10 minutes at about 20 ° C.
  • step j) comprises a step in which the coat is wiped and stretched, predried using vacuum at about 60 ° C. for about 3 minutes and for about 8 hours ( h) is dried at about 50 ° C.
  • step n) for about 2 hours and the dehumidifying in step o) for about 6 to 8 hours in a rotating vessel at 18 U / min for about 10 minutes at about 20 ° C be performed.
  • step p) is carried out for about 2 hours at about 40 ° C.
  • the invention also relates to a leather shrink, which is obtainable by the method according to the invention described above and preferably has a coat thickness of 2 to 3 mm, preferably 2.3 to 2.5 mm.
  • FIG. 1 shows a schematic overview of the process according to the invention, comprising the steps of washing at least one chromium-tanned coat (Chromwetblue) in a washing solution containing 200% (w / w) water and 0.2% (based on the shaved weight of the hide) ( w / w) of a nonionic surfactant (101); Neutralizing the treated hide in a neutralization solution containing 100% (w / w) water, 1.5% (w / w) sodium formate and 3% (w / w) sodium bicarbonate (102) based on the shaved weight of the hide; Pre-greasing comprising incubating the coat with 0.5% (w / w) solution of a fatty acid ester, 2% (w / w) solution of a polymer tanning agent and 20% (w / w) solution of a retanning agent (103); Dyeing the coat in a dyeing solution comprising 50% (w / w)
  • Figure 2 shows the surface of a uniform calf leather shrinkage, which was produced by the method according to the invention.
  • FIG. 2B shows the surface of a nonuniform calf leather shrinkage which was not produced by the method according to the invention.
  • Chromwetblue (tanned intermediate with a chromium oxide content of at least 1.5%) was used.
  • the dyeing was achieved at 50%> water 20 ° C with 1.5% ammonia and acidic dye for about 60 minutes at about 12 U / min and in the same medium with the addition of 100% water 60 ° C and 4, 55% active ingredient content in a ratio of 1: 1 over 40 minutes greased and fixed by addition of 3.5% formic acid 85%> over 60 minutes 5% fat medium mixture of long-chain paraffins about 45% active ingredient and sulfited oils.
  • the final tone adjustment of the color was done in a fresh bath with 200% water at 50 ° C and an addition of anionic dyes of the acidic noun type for 60 minutes and was fixed by the addition of 0.5-1.0%) formic acid 85% for 20 minutes and completed.
  • the final pH is between 3.5 and 3.6.
  • the drying was initiated by intensive wilting and stretching by means of commercial roller machines. Pre-drying was carried out using the vacuum technique at 60 ° C. for 3 minutes and desiccation in the drying tunnel for 8 hours at 50 ° C. By intensively rewetting the leather matrix to> 50% water content, reconditioning of the fiber was achieved. This was followed by re-drying of the leather matrix to less than 15% water content by means of vacuum technology at 60 ° C. for 1-2 minutes and hanging drying for at least 8 hours at 40 ° C. The intensive softening of the fiber was carried out by means of a commercial continuous rolling machine with pen tools and is preparatory operation for the surface coating (dressing).
  • the finish consisted of a mixture of finely divided polymers about 40% active ingredient content and finely divided polyurethane dispersions about 30% active ingredient content (Modified polyurethane / Acrylatcopolymeremulsion), which receive their color by the addition of inorganic pigment dispersions.
  • 400 parts of binder mixture were mixed with 100 parts of inorganic pigments and 350-400 parts of water.
  • the binder mixture is applied to the leather surface 2-3 times (10-15gr / square foot of leather) by means of a commercially available rotary sprayer and connected with a through-press machine at 80 ° C filmed. This operation was repeated 3 times.
  • an aqueous emulsion varnish based on polyurethane 25% active ingredient content of approximately 10gr / square foot of leather the dressing film was adjusted medium hard.
  • the ironing machine was ironed at about 80 ° C. Through a repeated tunneling by means of the continuous roller machine, an intensive fiber loosening was achieved, which represents a preparatory work for the subsequent walking in the barrel barrel.
  • the working process Walken is decisive for the expression of the wholegrain grain and the resulting leather surface (shrink optics).
  • the final fixation of the shrinkage scars was achieved by applying 2-isocyanate crosslinked, aqueous, finely divided polyurethane dispersions (about 30%) in a mixing ratio of 30 parts binder in 100 parts water with an application amount of at least 10 mg / square foot of leather by means of a commercial Rotary sprayer achieved.
  • the calf leather shrinkage thus obtained shows predominantly a homogeneously designed surface as shown in FIG. 2A.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Abstract

L'invention concerne des mesures pour le traitement et l'ennoblissement du cuir. Elle concerne en particulier un procédé de fabrication de cuir rétracté comprenant les étapes suivantes : a) le lavage d'au moins une peau tannée au chrome (chromwetblue) dans une solution de lavage ; b) la neutralisation de la peau traitée dans une solution de neutralisation ; c) le pré-graissage de la peau ; d) la coloration de la peau dans une solution de teinture ; e) le graissage par addition de mélange d'agents de graissage ; f) la fixation par addition d'acide formique ; g) le réglage de la teinte finale ; h) la fixation ; i) le lavage de la peau ; j) le séchage de la peau ; k) l'application d'une solution de mélange de liants ; l) l'application d'une émulsion de laque aqueuse à base de polyuréthane ; m) le repassage et le roulage de la peau ; n) le foulage de la peau sous apport continu d'humidité ; o) la déshumidification de la peau ; p) le conditionnement de la peau et la réduction ultérieure de la teneur en humidité ; et q) l'application d'une solution de fixation.
PCT/EP2017/055503 2016-03-10 2017-03-09 Procédé d'ennoblissement du cuir WO2017153505A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201780015861.9A CN109072546A (zh) 2016-03-10 2017-03-09 用于精制皮革的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16159622.6 2016-03-10
EP16159622.6A EP3216916B1 (fr) 2016-03-10 2016-03-10 Procede d'amelioration du cuir

Publications (1)

Publication Number Publication Date
WO2017153505A1 true WO2017153505A1 (fr) 2017-09-14

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PCT/EP2017/055503 WO2017153505A1 (fr) 2016-03-10 2017-03-09 Procédé d'ennoblissement du cuir

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EP (1) EP3216916B1 (fr)
CN (1) CN109072546A (fr)
DK (1) DK3216916T3 (fr)
ES (1) ES2702480T3 (fr)
PL (1) PL3216916T3 (fr)
WO (1) WO2017153505A1 (fr)

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CN112725545A (zh) * 2020-12-10 2021-04-30 兴业皮革科技股份有限公司 一种仿油磨砂革的涂饰加工工艺
CN116004930A (zh) * 2023-02-27 2023-04-25 峰安皮业股份有限公司 一种环保耐磨pu牛二层皮革的制作工艺
CN116144845A (zh) * 2022-09-08 2023-05-23 绍兴海滨皮革有限公司 高色牢度水性三防皮革及其制备工艺
CN117683951A (zh) * 2024-01-23 2024-03-12 步威（清远）皮革有限公司 一种高强度、抗撕拉牛二层反毛皮及其制备工艺

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CN114540557A (zh) * 2021-12-14 2022-05-27 浙江中辉裘革科技有限公司 一种羊皮仿琥珀毛革生产工艺

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CN112725545A (zh) * 2020-12-10 2021-04-30 兴业皮革科技股份有限公司 一种仿油磨砂革的涂饰加工工艺
CN116144845A (zh) * 2022-09-08 2023-05-23 绍兴海滨皮革有限公司 高色牢度水性三防皮革及其制备工艺
CN116004930A (zh) * 2023-02-27 2023-04-25 峰安皮业股份有限公司 一种环保耐磨pu牛二层皮革的制作工艺
CN116004930B (zh) * 2023-02-27 2024-01-05 峰安皮业股份有限公司 一种环保耐磨pu牛二层皮革的制作工艺
CN117683951A (zh) * 2024-01-23 2024-03-12 步威（清远）皮革有限公司 一种高强度、抗撕拉牛二层反毛皮及其制备工艺

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EP3216916B1 (fr) 2018-09-26
DK3216916T3 (en) 2019-01-21
CN109072546A (zh) 2018-12-21

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