EP2205768A1 - Verfahren zur herstellung von leder - Google Patents
Verfahren zur herstellung von lederInfo
- Publication number
- EP2205768A1 EP2205768A1 EP08841840A EP08841840A EP2205768A1 EP 2205768 A1 EP2205768 A1 EP 2205768A1 EP 08841840 A EP08841840 A EP 08841840A EP 08841840 A EP08841840 A EP 08841840A EP 2205768 A1 EP2205768 A1 EP 2205768A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glycol
- formaldehyde
- melamine
- formulation
- free
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000010985 leather Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 78
- 238000009472 formulation Methods 0.000 claims abstract description 73
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 41
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 239000011877 solvent mixture Substances 0.000 claims abstract description 14
- 241001465754 Metazoa Species 0.000 claims abstract description 10
- 239000011265 semifinished product Substances 0.000 claims abstract description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 37
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 24
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 24
- 150000005846 sugar alcohols Polymers 0.000 claims description 20
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 15
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- UWHCKJMYHZGTIT-UHFFFAOYSA-N Tetraethylene glycol, Natural products OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 claims description 4
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 claims description 4
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 34
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000000243 solution Substances 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000002156 mixing Methods 0.000 description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- 235000013311 vegetables Nutrition 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000013011 aqueous formulation Substances 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920001864 tannin Polymers 0.000 description 3
- 239000001648 tannin Substances 0.000 description 3
- 235000018553 tannin Nutrition 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 2
- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052615 phyllosilicate Inorganic materials 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- SKCQDFLBBMGDPT-UHFFFAOYSA-L 4-((2,4-dihydroxy-5-((2-hydroxy-3,5-dinitrophenyl)azo)-3-((4-nitrophenyl)azo)phenyl)azo)-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt Chemical compound [Na+].[Na+].OC1=C(N=NC=2C(=C(C=C(C=2)[N+]([O-])=O)[N+]([O-])=O)O)C=C(N=NC=2C3=C(O)C=C(C=C3C=C(C=2)S([O-])(=O)=O)S([O-])(=O)=O)C(O)=C1N=NC1=CC=C([N+]([O-])=O)C=C1 SKCQDFLBBMGDPT-UHFFFAOYSA-L 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 235000011468 Albizia julibrissin Nutrition 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 241000283690 Bos taurus Species 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000289581 Macropus sp. Species 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 240000005852 Mimosa quadrivalvis Species 0.000 description 1
- 241001494479 Pecora Species 0.000 description 1
- 239000004280 Sodium formate Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 241000272534 Struthio camelus Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 206010000496 acne Diseases 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000006471 dimerization reaction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002374 hemiaminals Chemical class 0.000 description 1
- 150000004698 iron complex Chemical class 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000991 leather dye Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 235000015277 pork Nutrition 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000003420 transacetalization reaction Methods 0.000 description 1
- 238000005829 trimerization reaction Methods 0.000 description 1
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
Definitions
- the present invention relates to a process for the production of leather, which comprises treating animal hides or semi-finished products with a formaldehyde-free formulation of melamine in a solvent or solvent mixture comprising at least one polyhydric alcohol.
- the present invention relates to formaldehyde-free formulations of melamine in a solvent or solvent mixture comprising at least one polyhydric alcohol.
- soft leathers which are leathers that feel soft and full, but nevertheless have sufficient strength.
- resin tanning agents which contain a melamine resin as the active substance are used to produce such softer and stronger leathers.
- Such melamine resins in most cases, comprise melamine reacted with one or more equivalents of formaldehyde and optionally aminalized with one or more equivalents of a monohydric or polyhydric alcohol.
- dimerization reactions, trimerization reactions and further oligomerization reactions occur, which are usually condensations, transacetalizations or umaminalizations.
- the resin tanning agents described in this way are often polymer mixtures of indeterminate structure. Such resin tanning agents can cleave formaldehyde, which is undesirable under certain conditions.
- the cleaved formaldehyde or its hemiaminal is often blamed with melamine for the tanning or retanning action and softness desired of the leather. Also, in many cases, the high molecular weight is responsible for the abundance of leather.
- Animal skins are the skins of any dead animals such as beef, veal, pork, goat, sheep, kangaroo, fish, ostrich or game.
- animal skins are usually depilated and, if they were depilated in the presence of lime, preferably decalcified.
- Semifinished products are animal hides which are pickled or pretanned or optionally tanned by any method, preferably semifinished products produced by the action of chromium salts or in the presence of polymeric tanning agents.
- animal hides or semi-finished products are treated with a formaldehyde-free formulation of melamine. It is understood by formaldehyde-free that the formaldehyde content is less than 0.01 mol per mol of melamine.
- the formaldehyde content of the formaldehyde used according to the invention is below 20 ppm, preferably below 15 ppm, determined, for example, according to DIN ISO / TN 17226 or according to DIN 53315 (old).
- no formaldehyde is detectable in the formaldehyde-free formulations used according to the invention.
- Melamine is pure melamine, which has therefore not been reacted with formaldehyde or other aldehydes such as acetaldehyde or benzaldehyde.
- melamine is used in a solvent or solvent mixture comprising at least one polyhydric alcohol.
- polyhydric alcohols are used at room temperature. for liquid compounds which carry at least two alcoholic hydroxyl groups per mole. Such hydroxy groups may be secondary or primary hydroxy groups.
- Preferred polyhydric alcohols are ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, glycerol and diglycerol.
- formulations used according to the invention comprise at least two polyhydric alcohols.
- formulations used according to the invention comprise at least one dihydric and at least one trihydric alcohol.
- the solvent mixture used is a combination comprising glycerol as the trihydric alcohol and ethylene glycol, diethylene glycol or triethylene glycol as the dihydric alcohol, particularly preferred are combinations of glycerol and triethylene glycol.
- formulations used in the invention comprise from 10 to 50% by weight of dihydric alcohol and from 50 to 90% by weight of trivalent alcohol, based in each case on the entire solvent mixture.
- the formulations used according to the invention preferably contain no halogenated solvents, for example chlorobenzene, chloroform or carbon tetrachloride.
- containing no halogenated solvents means that less than 100 ppm, preferably no halogenated solvent, can be detected by means of measures known per se, such as elemental analyzes.
- the formulation used according to the invention contains one or more polyhydric alcohols as sole organic solvent (s).
- Formulation used according to the invention may further comprise water.
- the formulation used according to the invention contains from 0.1 to 20% by weight of melamine, preferably from 1 to 10% by weight.
- the process according to the invention for the production of leather is carried out as a tanning process, hereinafter also referred to as tanning process according to the invention, preferably as a retanning process, hereinafter also referred to as retanning process according to the invention.
- the tanning process according to the invention is generally carried out by adding at least one formulation according to the invention in one portion or in several portions immediately before or else during the tanning step.
- the tanning process according to the invention is preferably carried out at a pH of from 2.5 to 1 l, preferably to 4, it being frequently observed that the pH increases by about 0.3 to three units during the performance of the tanning process according to the invention.
- the novel tanning process is generally carried out at temperatures of 10 to 45 ° C, preferably at 20 to 30 0 C. Has proven useful a duration of 10 minutes to 12 hours, preferably one to three hours.
- the tanning process according to the invention can be carried out in any conventional tanning vessel, for example by walking in barrels or in rotated drums.
- a total of 0.01 to 10% by weight of formaldehyde-free formulation of melamine is used, based on the melamine content of the formulation used according to the invention on the one hand and on the shaved weight on the other hand, preferably 0.5 to 3 wt .-%.
- formaldehyde-free formulation of melamine is used together with one or more conventional tanning agents, in particular with at least one formaldehyde-free tanning or neutralizing agent, for example with chrome tanning agents, mineral tannins, sheet silicates, polymer tanning agents or vegetable tanning agents , as described, for example, in Ullmann's Encyclopedia of Industrial Chemistry, Volume A15, pages 259 to 282 and especially page 268 ff., 5th edition, (1990), Verlag Chemie Weinheim.
- the weight ratio of melamine: conventional tanning agent or sum of conventional tanning agents is suitably from 0.01: 1 to 100: 1 (based on the solids contents).
- only a few ppm of conventional tanning agent according to the invention are added to the formulation.
- formaldehyde-free formulation of melamine is used together with one or more fatliquoring agents or oleophilic components.
- formaldehyde-free formulation of melamine is added in one portion or in several portions before or during pre-tanning.
- An addition in the pimple is conceivable.
- the Nachgerbvons invention is based on conventional, ie, for example, with chrome tanning agents, phyllosilicates, mineral see tannins, polymer tanning agents, aldehydes or vegetable tannins tanned semi-finished or semi-finished products according to the invention as described above.
- chrome tanning agents, phyllosilicates, mineral see tannins, polymer tanning agents, aldehydes or vegetable tannins tanned semi-finished or semi-finished products according to the invention as described above.
- at least one formaldehyde-free formulation of melamine is allowed to act on semifinished products, ie, at least one formaldehyde-free formulation of melamine is treated.
- the retanning process according to the invention can be carried out under otherwise customary conditions. It is expedient to select one or more, ie 2 to 6, action steps and to rinse with water between the interaction steps.
- the temperature during the individual treatment steps is in each case from 5 to 60 0 C, preferably 20 to 45 ° C. It is expedient to use one or more further agents customarily used during the retanning, for example fatliquors, polymer tanning agents and acrylate- and / or methacrylate-based fatliquoring agents, tanning agents based on vegetable tanning agents, fillers, leather dyes or emulsifiers.
- fatliquors for example fatliquors, polymer tanning agents and acrylate- and / or methacrylate-based fatliquoring agents, tanning agents based on vegetable tanning agents, fillers, leather dyes or emulsifiers.
- Has proven useful for the Nachgerb compiler invention a duration of 10 minutes to 12 hours, preferably one to three hours.
- the retanning process according to the invention can be carried out in any conventional tanning vessel, for example by walking in barrels or in rotated drums.
- a total of 0.01 to 10% by weight of formaldehyde-free formulation of melamine according to the invention is used, based on the content of melamine on the one hand and on the shaved weight on the other hand, preferably 0.5 to 5% by weight. %.
- Another object of the present invention is leather, prepared by the method according to the invention.
- leather according to the invention is characterized by good fullness, softness and intensity of the dyeing and further good use properties such as, for example, the embossability, the grain tightness and the uniformity of the leather
- Leather according to the invention is suitable, for example, for producing shoe upper leather, items of clothing such as, for example, jackets, coats or trousers, and furthermore furniture.
- Another object of the present invention are formaldehyde-free formulations of melamine, comprising at least one polyhydric alcohol.
- formaldehyde-free, polyhydric alcohol and melamine are defined above.
- Preferred polyhydric alcohols are ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycols having an average molecular weight M w in the range from 250 to 5,000 g / mol, glycerol and diglycerol.
- formulations according to the invention comprise at least two polyhydric alcohols.
- Preferred formulations according to the invention comprise at least one dihydric and at least one trihydric alcohol.
- the solvent mixture used is a combination comprising glycerol as the trihydric alcohol and ethylene glycol, diethylene glycol or triethylene glycol as the dihydric alcohol, more preferably combinations of glycerol and triethylene glycol.
- formulations according to the invention comprise in the range from 50 to 90% by weight of dihydric alcohol and 10 to 50% by weight of trivalent alcohol, based in each case on the entire solvent mixture.
- Formulations of the invention preferably contain no halogenated solvents such as chlorobenzene, chloroform or carbon tetrachloride.
- containing no halogenated solvents means that less than 100 ppm, preferably no halogenated, solvent can be detected by conventional measures.
- Formulations of the invention preferably contain no acids such as sulfuric acid, hydrochloric acid or phosphoric acid.
- formulations according to the invention comprise at least one base, in particular at least one alkali metal hydroxide or alkali metal carbonate. Preference is given to potassium hydroxide and in particular sodium hydroxide. Suitable amounts of alkali metal hydroxide are, for example, from 0.1 to 10% by weight, based on melamine.
- formulations according to the invention have a pH in the range from 7 to 12, preferably 8 to 11.
- formulation according to the invention contains as sole organic solvent (s) one or more polyhydric alcohols.
- Formulation according to the invention may further contain water.
- formulation according to the invention contains 0.1 to 20 wt .-% melamine, preferably 1 to 10 wt .-%.
- Formulations according to the invention in many cases have the appearance of solutions. Formulations according to the invention generally look completely clear at the starting temperature in the process according to the invention, that is to say they are visible to the naked eye without haze.
- Formulations according to the invention may be reaction mixtures with reaction products of melamine or solutions of melamine.
- the formulations according to the invention are solutions of melamine.
- formulations according to the invention are colorless. In another embodiment of the present invention, formulations according to the invention may have a yellowish, amber or brownish color.
- dyeings are not in any case attributable to reaction products of melamine with polyhydric alcohol, but are not intended to give preference to any particular theory, but are believed to be due to interactions between two or more melamine molecules.
- Another object of the present invention is a process for the preparation of formulations according to the invention.
- For mixing can proceed according to known procedures. It is preferable to stir for mixing.
- the mixing can be carried out for example at room temperature or under heating, for example to temperatures in the range of 40 to 190 0 C, in particular 120 to 170 0 C.
- the mixing can be carried out preferably at atmospheric pressure, but also pressures such as 1, 5 to 15 bar are conceivable.
- Formulations of the invention are very suitable for the production of leather, for example by the method described above.
- a further subject of the present invention is thus the use of formulations according to the invention for the production of leather.
- the Walk drums 1 to 7 at 25 to 35 ° C with 2% each of a 40% aqueous formulation of polyacrylic acid (M n 70,000 g / mol, pH 5.5).
- 2% by weight of a 50% by weight (solids content) aqueous formulation of dyes whose solids were composed as follows were metered in:
- the leathers thus obtained were washed, dried, staked and evaluated according to the test criteria specified in Table 2.
- the leathers L.1 to L.5 according to the invention were obtained.
- the rating was based on a grading system from 1 (very good) to 5 (poor).
- the comparative tanning agent V-F.6 used was an aqueous formulation which was prepared as follows:
- the leathers according to the invention had in particular outstanding fullness and softness with excellent scar resistance. Summing up, the experiments show that the leather according to the invention in comparison to native skin (about 2-5 ppm of formaldehyde) does not provide any negligible contribution to free formaldehyde and at the same time satisfies the requirement for excellent filling effect and softness with excellent scar resistance become. Another advantage is the finding that the so-called area selectivity could also be improved over the prior art (ratio of the abundance of the core area to the flame).
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08841840A EP2205768B1 (de) | 2007-10-24 | 2008-10-20 | Verfahren zur herstellung von leder |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07119191 | 2007-10-24 | ||
PCT/EP2008/064118 WO2009053328A1 (de) | 2007-10-24 | 2008-10-20 | Verfahren zur herstellung von leder |
EP08841840A EP2205768B1 (de) | 2007-10-24 | 2008-10-20 | Verfahren zur herstellung von leder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2205768A1 true EP2205768A1 (de) | 2010-07-14 |
EP2205768B1 EP2205768B1 (de) | 2011-08-24 |
Family
ID=40266126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08841840A Active EP2205768B1 (de) | 2007-10-24 | 2008-10-20 | Verfahren zur herstellung von leder |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP2205768B1 (de) |
KR (1) | KR101540134B1 (de) |
CN (1) | CN101835909B (de) |
AT (1) | ATE521720T1 (de) |
BR (1) | BRPI0817963B1 (de) |
ES (1) | ES2368671T3 (de) |
PT (1) | PT2205768E (de) |
WO (1) | WO2009053328A1 (de) |
Families Citing this family (4)
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CN102939393A (zh) * | 2010-06-14 | 2013-02-20 | 巴斯夫欧洲公司 | 生产皮革的方法 |
KR20220057975A (ko) | 2020-10-30 | 2022-05-09 | 주식회사 마젠 | 유연한 향기 나는 말가죽 제조 방법 |
KR102506705B1 (ko) | 2020-12-23 | 2023-03-09 | 화이트산업 주식회사 | 피혁 도장용 탑 코팅제 및 이를 이용한 피혁 탑 도장방법 |
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US2470450A (en) * | 1945-09-07 | 1949-05-17 | John R Evans & Company | Tanning with free formaldehyde and melamine simultaneously |
DE3632587A1 (de) * | 1986-09-25 | 1988-04-07 | Cassella Ag | Verfahren zur gerbung von leder |
GB9917704D0 (en) * | 1999-07-29 | 1999-09-29 | Albright & Wilson Uk Ltd | Tanning leather |
DE10047024A1 (de) * | 2000-09-22 | 2002-04-11 | Basf Ag | Verfahren zur Herstellung von flammgeschützten Polyurethanweichschaumstoffen |
DE102005008034A1 (de) * | 2005-02-22 | 2006-08-31 | Lanxess Deutschland Gmbh | Säuregruppenhaltige Kondensationsprodukte |
US7153962B1 (en) * | 2005-07-12 | 2006-12-26 | Casale Chemicals S.A. | Process for gently cooling and crystallizing melamine from a melamine melt or from the gaseous phase |
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WO2009053328A1 (de) | 2009-04-30 |
PT2205768E (pt) | 2011-09-06 |
KR101540134B1 (ko) | 2015-07-28 |
CN101835909A (zh) | 2010-09-15 |
BRPI0817963B1 (pt) | 2018-12-26 |
EP2205768B1 (de) | 2011-08-24 |
ES2368671T3 (es) | 2011-11-21 |
KR20100080840A (ko) | 2010-07-12 |
BRPI0817963A2 (pt) | 2015-05-05 |
ATE521720T1 (de) | 2011-09-15 |
CN101835909B (zh) | 2013-09-18 |
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