EP1297189B1 - Verwendung von hydrolysaten von vegetabilen gerbstoffen zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder - Google Patents
Verwendung von hydrolysaten von vegetabilen gerbstoffen zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder Download PDFInfo
- Publication number
- EP1297189B1 EP1297189B1 EP01943520A EP01943520A EP1297189B1 EP 1297189 B1 EP1297189 B1 EP 1297189B1 EP 01943520 A EP01943520 A EP 01943520A EP 01943520 A EP01943520 A EP 01943520A EP 1297189 B1 EP1297189 B1 EP 1297189B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chrome
- leather
- vegetable
- chromium
- hydrolysates
- 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.)
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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
- C14C3/28—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
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/10—Vegetable tanning
- C14C3/12—Vegetable tanning using purified or modified vegetable tanning agents
Definitions
- the present invention relates to the use of vegetable hydrolysates Tannins for the stabilization of chromium III against unwanted oxidation in chrome-tanned leather.
- Known tanning is understood to be a process comprising several stages. which serves the unstable, perishable, rot and decomposition To permanently preserve the collagen of the animal skin freed from skin and hair.
- the tanning agents used for tanning cause crosslinking of the collagen molecules the skin and thus the stabilization of the chain - like structures of the Skin protein.
- Each tanning is divided into several phases, some of which are clearly separated from each other, but partly also merge into each other.
- the preparation phase the skin substance is brought to the required state for the process by soaking, pickling, liming, deliming, washing, pickling, tanning or conditioning.
- the tanning agent migrates by diffusion to the binding sites. In this case, the transport medium is always water, with additions of diffusion-accelerating chemicals are possible.
- the bonding phase usually begins before the transport phase is completed.
- Transport phase and binding phase can be understood in some ways as "actual" tanning.
- a post- processing phase which is characterized by processes such as mechanical processing, neutralization, retanning, possibly dyeing, fatliquoring, fixing and washing.
- the tanning is carried out predominantly as so-called chrome tanning, in which Salts of trivalent chromium (chromium-III), for example, chromium sulfate used come.
- Chromium tanning is still the most important with a share of more than 80% Gerbart and because of their technical advantages and versatility Chrome-tanned leather is unanimous in the professional world the opinion that In the foreseeable future, the dominant role of chrome tanning will not change becomes.
- the object of the present invention has been to provide a method for stabilization of chromium III in chrome-tanned leather. Another task has consisted of providing substances or compositions that are used in the In the course of leather production are introduced into the leather and as stabilizing Additives for chromium-III act.
- the present invention initially relates to the use of hydrolysates of vegetable tannins to stabilize chromium III against unwanted Oxidation in chrome-tanned leather.
- Examples of vegetable tannins are Acacia negra, Algarobilla, Anjico, Avaram, Basbul, Badan, Barbatimao, Birch, Canaigre, Dahua, Divi-Divi Cascalote, Oak, Alder, Spruce, Chinese Galls, Japanese Galls, North African Galls, Vietnamese Galls, Gambir, Goran, Hemlock, Chestnut, Knoppern, Maletto, Mangrove, Mauto, Mimosa, Murici, Myrobalan, Myrtan, Quebracho, Sonali, Sumach, Tara, Tizerah, Trillo, Ulmo, Urunday, Valonea, Grasp Underground (compare: Hans Herfeld, "Library of the Leather, Volume 3: Tanner, Tanning and Retanning", Frankfurt 1985, pages 37-38).
- Tannins were formerly classified according to their behavior when heated dry at 180 to 200 ° C according to the resulting main products in pyrogallol and catechol.
- this classic classification is now considered outdated and modern understanding distinguishes the hydrolyzable tannins, which are decomposed by hydrolyzing enzymes or acids into lower molecular weight substances, of condensed tannins, the action of mineral acids or oxidizing substances, the high molecular weight , form poorly soluble phlobaplene (see: Hans Herfeld, "Library of the Leather, Volume 3: Tanner, Tanning and Retanning", Frankfurt 1985, page 44).
- Hydrolyzable vegetable tanning agents such as are used in the context of the present invention as starting materials for the preparation of chromium III oxidation-stabilizing hydrolysates, are about chestnut, oak, Valonea, Myrobalans, Sumac, Algarobilla, Divi-Divi and the various bile tannins.
- condensed tannins which are not used as starting materials for the preparation of the chromium III oxidation stabilizing hydrolyzates because of their non-hydrolysability are, for example, quebracho, mimosa, mangrove, myrtan, acacia negra, spruce, Hemlock, birch.
- hydrolysable vegetable tannins are subjected to hydrolysis.
- the type of hydrolysis is in principle subject to no restriction, it can be done, for example, acidic, alkaline or enzymatic. In the context of the present invention, however, acid hydrolysis is preferred.
- the hydrolysis is carried out so that the degree of hydrolysis is in the range of 10 to 100%.
- degree of hydrolysis is understood to mean to what extent the vegetable tanning agent used for the hydrolysis has been "consumed" in the course of the hydrolysis. By measurement, this can be determined by determining in what amount the starting material is still present as such after hydrolysis.
- the vegetable tannin used after the hydrolysis is still present at 10% by weight, based on the total dry mass of hydrolyzate and the unhydrolysed starting material still present, then 90% by weight of the starting material have been hydrolyzed and the degree of hydrolysis is 90%.
- the vegetable tannin used is still present after hydrolysis at 30% by weight, based on the total dry mass of hydrolyzate and unhydrolysed starting material still present, then 70% by weight of the starting material was hydrolyzed and the degree of hydrolysis is 70 %.
- the vegetable tannin used is no longer detectable after the hydrolysis, then 100% by weight of the starting material were correspondingly hydrolyzed and the degree of hydrolysis is 100%.
- the hydrolysis is carried out so that the to be hydrolyzed vegetable tannins dissolved or suspended in a liquid system or be emulsified.
- aqueous systems especially water itself - as liquid systems are preferred
- the procedure for the preparation of a hydrolyzate suitable according to the invention as follows: Add to a mixture of 100 g hydrolyzable vegetable Tannin and 100-150 g of water about 5 g of concentrated sulfuric acid and stir the entire mixture at a temperature of about 80-90 ° C for about 30 150 minutes. Subsequently, it is adjusted with sodium hydroxide solution or aqueous ammonia a pH in the range of 3 - 5 a. The whole process is at atmospheric pressure, i.e. carried out about 1 bar.
- hydrolysates of vegetable tannins become according to the invention in particular in the course of the retanning into chrome-tanned leather introduced.
- the amount of hydrolysates of vegetable tannins depends essentially on the amount of chromium present in the leather.
- the hydrolyzates of vegetable tannins are preferably used in an amount which is 40 to 50% by weight of the total amount of the hydrolyzate, based on the trivalent chromium introduced into the leather during tanning, this chromium being calculated as Cr 2 O 3 .
- hydrolysable vegetable tanning agents can be used for the preparation of the hydrolysates to be used.
- such hydrolysates of vegetable tannins for the stabilization of chromium-III which are obtainable by hydrolysis of vegetable tannins selected from the group chestnut, oak, Valonea, Myrobalans, Sumach, Algarobilla, Divi-Divi, Tara and the various bile tannins.
- Chestnut, Tara and Valonea are very particularly preferred as starting materials for the preparation of the hydrolysates.
- Tara hydrolyzate in whose production per 100 g of tare 150 g of water are used, and wherein for the hydrolysis 5 g of sulfuric acid for 150 minutes at 80 - 90 ° C act and then with aqueous sodium hydroxide solution, the pH to 3-5 sets , is very particularly preferred.
- the hydrolysates of vegetable tannins are used in combination with reducing agents.
- Reducing agents are substances which are capable of reducing hexavalent chromium to trivalent chromium.
- suitable reducing agents are Na 2 S 2 O 5 , Na 2 S 2 O 3 , phyllosilicates, Na 2 SO 3 and iron (II) salts.
- the hydrolysates of vegetable tannins are used in combination with radical scavengers.
- radical scavengers substances are too who are able to bind free radicals.
- suitable radical scavengers are vitamin C, vitamin E, sterically hindered phenols as well as the Expert known HALS compounds (hindered amine light stabilizer).
- Another object of the invention is a method for the treatment of leather, wherein man wet blue at any point in the course of further processing to the finished leather - preferably in the course of retanning - with one or more hydrolysates treated by vegetable tannins.
- wet blue is used in the context of the invention for chrome-tanned hides, independently of whether these skins are ready for use after their production Further processed leather or whether commercially available chrome-tanned hides, so wet blue in the strict sense, at a later date ready for use Leather further processed.
- the leather thus produced was tested for softness and fullness. The result can be seen in Table 1. Furthermore, the leather was aged for 24 hours at 80 ° C and then examined for its content of chromium-VI. The result can also be seen in Table 1.
- Example 2 was repeated except that the addition of the hydrolyzate of Example 1 was omitted (blind sample). The result can be seen in Table 1.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Description
- C.Hauber, H.P.Germann, "Untersuchungen zur Entstehung und Vermeidung von Chromat in Leder", Leder und Häutemarkt 1999, Seite 25-30
- Schill & Seilacher, "Trivalent chromium to hexavalent chromium?", Leather 1999 (Heft 12), Seite 33-34
- D.Graf, Dr. Boehme, "The influence of relative humidity of air during storage on the formation lowering of CR(VI) in chrome tanned leathers", World Leather 2000 (Mai), Seite 38-40)
Gerbstoffe wurden früher nach ihrem Verhalten beim trockenen Erhitzen auf 180 bis 200 °C nach den dabei entstehenden Hauptprodukten in Pyrogallol- und Brenzkatechingerbstoffe eingeteilt. Diese klassische Einteilung gilt jedoch inzwischen als überholt und nach modernem Verständnis unterscheidet man die hydrolysierbaren Gerbstoffe, die durch hydrolysierend wirkende Enzyme oder durch Säuren in Substanzen mit niedrigerem Molekulargewicht zerlegt werden, von kondensierten Gerbstoffen, die bei Einwirkung von Mineralsäuren oder von oxidierend wirkenden Substanzen die hochmolekularen, schwerlöslichen Phlobaplene bilden (siehe: Hans Herfeld, "Bibliothek des Leders; Band 3: Gerbmittel, Gerbung und Nachgerbung", Frankfurt 1985, Seite 44).
Hydrolysierbare vegetabile Gerbstoffe, wie sie im Rahmen der vorliegenden Erfindung als Ausgangsstoffe zur Herstellung der Chrom-III gegen Oxidation stabilisierenden Hydrolysate zum Einsatz kommen, sind etwa Kastanie, Eiche, Valonea, Myrobalanen, Sumach, Algarobilla, Divi-Divi und die diversen Gallengerbstoffe.
Zu den kondensierten Gerbstoffen, die wegen ihrer Nicht-Hydrolisierbarkeit im Rahmen der vorliegenden Erfindung als Ausgangsstoffe zur Herstellung der Chrom-III gegen Oxidation stabilisierenden Hydrolysate nicht zum Einsatz kommen, rechnet man hingegen beispielsweise Quebracho, Mimosa, Mangrove, Myrtan, Acacia negra, Fichte, Hemlock, Birke.
Die Hydrolyse wird insbesondere so durchgeführt, daß der Hydrolysegrad im Bereich von 10 bis 100% liegt. Unter dem Begriff "Hydrolysegrad" ist dabei zu verstehen, in welchem Ausmaß der zur Hydrolyse eingesetzte vegetabile Gerbstoff im Zuge der Hydrolyse "verbraucht" worden ist. Meßtechnisch läßt sich dies dadurch ermitteln, daß man bestimmt, in welcher Menge der Ausgangsstoff nach der Hydrolyse als solcher noch vorhanden ist.
Ist beispielsweise der eingesetzte vegetabile Gerbstoff nach der Hydrolyse noch zu 10 Gew.% - Gew.% bezogen auf die Gesamttrockenmasse von Hydrolysat und noch vorhandenem nicht hydrolysierten Ausgangsstoff - vorhanden, so wurden dementsprechend 90 Gew.% des Ausgangsstoffes hydrolysiert und der Hydrolysegrad beträgt 90%.
Oder: Ist der eingesetzte vegetabile Gerbstoff nach der Hydrolyse noch zu 30 Gew.% - Gew.% bezogen auf die Gesamttrockenmasse von Hydrolysat und noch vorhandenem nicht hydrolysierten Ausgangsstoff - vorhanden, so wurden dementsprechend 70 Gew.% des Ausgangsstoffes hydrolysiert und der Hydrolysegrad beträgt 70%.
Oder: Ist der eingesetzte vegetabile Gerbstoff nach der Hydrolyse nicht mehr nachweisbar, so wurden dementsprechend 100 Gew.% des Ausgangsstoffes hydrolysiert und der Hydrolysegrad beträgt 100%.
- Die Temperatur im Bereich von 20 bis 200 °C, vorzugsweise im Bereich von 60 bis 100 °C
- Die Reaktionszeit im Bereich von 30 bis 720 Minuten
- Der Druck im Bereich von 0,5 bis 10 bar, vorzugsweise bei etwa 1 bar (Atmosphärendruck)
In einer bevorzugten Ausführungsform setzt man solche Hydrolysate von vegetabilen Gerbstoffen zur Stabilisierung von Chrom-III ein, die erhältlich sind durch Hydrolyse von vegetabilen Gerbstoffen, die ausgewählt sind aus der Gruppe Kastanie, Eiche, Valonea, Myrobalanen, Sumach, Algarobilla, Divi-Divi, Tara und die diversen Gallengerbstoffe. Dabei sind Kastanie, Tara und Valonea als Ausgangsstoffe zur Herstellung der Hydrolysate ganz besonders bevorzugt. Tara-Hydrolysat, bei dessen Herstellung pro 100 g Tara 150 g Wasser eingesetzt werden, und wobei man zur Hydrolyse 5 g Schwefelsäure für 150 Minuten bei 80 - 90 °C einwirken läßt und anschließend mit wäßriger Natronlauge den pH-Wert auf 3 - 5 einstellt, ist ganz besonders bevorzugt.
Des weiteren wurde das Leder 24 Stunden bei 80 °C gealtert und anschließend auf seinen Gehalt an Chrom-VI untersucht. Das Ergebnis kann ebenfalls Tabelle 1 entnommen werden.
Versuch | Weichheit | Fülle | ppm Cr-VI |
Beispiel B2 | 9 | 6,5 | 3,0 |
Vergleichsbeispiel V1 (Blindprobe) | 10 | 5,5 | 16,0 |
Vergleichsbeispiel V2 | 8 | 7 | 9,2 |
Vergleichsbeispiel V3 | 7 | 9 | 4,0 |
Vergleichsbeispiel V4 | 8 | 7,5 | 5,5 |
Vergleichsbeispiel V5 | 7 | 9 | 4,5 |
Vergleichsbeispiel V6 | 8 | 7 | 8,0 |
Zugesetzte Testsubstanz | ppm Chrom-VI |
keine (Blindwert) | 25 |
acrylischer Nachgerbstoff | 25 |
Kastanie, nicht hydrolysiert | 5,5 |
Kastanie, sauer hydrolysiert | 3 |
Valonea, sauer hydrolysierte | 1,5 |
Tara, sauer hydrolysiert | 1 |
Claims (8)
- Verwendung von Hydrolysaten von vegetabilen Gerbstoffen zur Stabilisierung von Chrom-III gegen Oxidation in chromgegerbtem Leder.
- Verwendung nach Anspruch 1, wobei man die Hydrolysate von vegetabilen Gerbstoffen im Zuge der Nachgerbung in chromgegerbtes Leder einbringt.
- Verwendung nach Anspruch 1 oder 2, wobei man solche Hydrolysate von vegetabilen Gerbstoffen einsetzt, die erhältlich sind durch saure Hydrolyse von vegetabilen Gerbstoffen.
- Verwendung nach einem der Ansprüche 1 bis 3, wobei man solche Hydrolysate von vegetabilen Gerbstoffen einsetzt, die erhältlich sind durch Hydrolyse von vegetabilen Gerbstoffen ausgewählt aus der Gruppe Kastanie, Tara und Valonea.
- Verwendung nach einem der Ansprüche 1 bis 4, wobei man die Hydrolysate von vegetabilen Gerbstoffen in Kombination mit Reduktionsmitteln einsetzt.
- Verwendung nach einem der Ansprüche 1 bis 4, wobei man die Hydrolysate von vegetabilen Gerbstoffen in Kombination mit Radikalfängern einsetzt.
- Verfahren zur Behandlung von Leder, dadurch gekennzeichnet, daß man wet blue an einer beliebigen Stelle im Zuge der weiteren Bearbeitung zum fertigen Leder mit ein oder mehreren Hydrolysaten von vegetabilen Gerbstoffen behandelt.
- Verfahren zur Behandlung von Leder, dadurch gekennzeichnet, daß man wet blue im Zuge der Nachgerbung mit ein oder mehreren Hydrolysaten von vegetabilen Gerbstoffen behandelt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10031545 | 2000-06-28 | ||
DE10031545A DE10031545A1 (de) | 2000-06-28 | 2000-06-28 | Verwendung von Hydrolysaten von vegetabilen Gerbstoffen zur Stabilisierung von Chrom-III gegen Oxidation in chromgegerbtem Leder |
PCT/EP2001/006860 WO2002000942A1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von hydrolysaten von vegetabilen gerbstoffen zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Publications (2)
Publication Number | Publication Date |
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EP1297189A1 EP1297189A1 (de) | 2003-04-02 |
EP1297189B1 true EP1297189B1 (de) | 2005-08-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP01943520A Expired - Lifetime EP1297189B1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von hydrolysaten von vegetabilen gerbstoffen zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1297189B1 (de) |
AT (1) | ATE302857T1 (de) |
BR (1) | BR0111929B1 (de) |
DE (2) | DE10031545A1 (de) |
WO (1) | WO2002000942A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE469988T1 (de) | 2005-11-29 | 2010-06-15 | Tfl Ledertechnik Gmbh | Lederbehandlung und mittel |
DE102009060176A1 (de) | 2009-12-23 | 2011-06-30 | Volkswagen AG, 38440 | Verfahren zur Herstellung von gegerbtem Leder |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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RO90893B1 (ro) * | 1984-10-08 | 1987-01-31 | Ioan Diaconu | PROCEDEU DE TABACIRE CROM-TANIN A PIEILOR PENTRU FETE îNCALTAMINTE |
-
2000
- 2000-06-28 DE DE10031545A patent/DE10031545A1/de not_active Withdrawn
-
2001
- 2001-06-19 DE DE50107215T patent/DE50107215D1/de not_active Expired - Lifetime
- 2001-06-19 WO PCT/EP2001/006860 patent/WO2002000942A1/de active IP Right Grant
- 2001-06-19 EP EP01943520A patent/EP1297189B1/de not_active Expired - Lifetime
- 2001-06-19 BR BRPI0111929-0A patent/BR0111929B1/pt not_active IP Right Cessation
- 2001-06-19 AT AT01943520T patent/ATE302857T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP1297189A1 (de) | 2003-04-02 |
ATE302857T1 (de) | 2005-09-15 |
DE10031545A1 (de) | 2002-01-10 |
WO2002000942A1 (de) | 2002-01-03 |
BR0111929A (pt) | 2003-06-10 |
DE50107215D1 (de) | 2005-09-29 |
BR0111929B1 (pt) | 2012-10-30 |
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