EP1297188B1 - Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder - Google Patents
Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder Download PDFInfo
- Publication number
- EP1297188B1 EP1297188B1 EP01964997A EP01964997A EP1297188B1 EP 1297188 B1 EP1297188 B1 EP 1297188B1 EP 01964997 A EP01964997 A EP 01964997A EP 01964997 A EP01964997 A EP 01964997A EP 1297188 B1 EP1297188 B1 EP 1297188B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chrome
- gallic acid
- leather
- chromium
- stabilising
- 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.)
- Expired - Lifetime
Links
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
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium 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
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/28—Multi-step processes
Definitions
- the present invention relates to the use of gallic acid for stabilization of Chromium III against unwanted oxidation in chrome-tanned leather.
- tanning is a multi-step process which serves the unstable, easily perishable, subject to decay and decomposition To permanently preserve collagen of animal skin freed from skin and hair.
- the tannins used for tanning cause the collagen molecules to crosslink the skin and thus the stabilization of the chain structures of the Skin protein.
- Each tanning process runs in several phases, some of which are clearly separated from one another, but some of which merge.
- the preparation phase the skin substance is brought into the condition required for the process by soaking, pickling, liming, descaling, washing, pickling, pretanning or conditioning.
- the transport phase the tanning agent migrates to the binding sites by diffusion.
- the transport medium is always water, whereby additions of diffusion accelerating chemicals are possible.
- the binding phase usually begins before the transport phase is completed.
- Transport phase and binding phase can be understood in a certain way as "actual" tanning.
- the tanning is mainly carried out as so-called chrome tanning, in which Trivalent chromium (chromium III) salts, for example chromium sulfate, are used come.
- Chrome tanning is still the most important with a share of over 80% Gerbart and because of their technical advantages and versatility Chrome-tanned leather is unanimous in the professional world that the dominant role of chrome tanning will not change in the foreseeable future becomes.
- the object of the present invention was to provide a method for stabilization of chrome III in chrome-tanned leather. Another job has consisted of providing substances or compositions which are in the In the course of leather production, be introduced into the leather and as a stabilizing Additives for Chromium-III act.
- gallic acid does an excellent job. she Effectively stabilizes Chromium III without negatively affecting the application properties of the leather.
- the present invention firstly relates to the use of gallic acid to stabilize chromium III against unwanted oxidation in chrome-tanned Leather.
- Gallic acid has the following chemical structure:
- the gallic acid can be used anywhere in the course of leather production be used. However, it is preferred to use gallic acid in the course of retanning in chrome-tanned leather.
- the amount of gallic acid depends essentially on the amount of chromium present in the leather.
- Gallic acid is preferably used in an amount which is 40 to 50% by weight - total amount of gallic acid based on the trivalent chromium introduced into the leather during tanning, this chromium being calculated as Cr 2 O 3 .
- gallic acid is used in combination with reducing agents.
- Reducing agents are understood to mean substances that are able to reduce hexavalent chromium to trivalent chromium.
- suitable reducing agents are Na 2 S 2 O 5 , Na 2 S 2 O 3 , layered silicates, Na 2 SO 3 and iron (II) salts.
- the gallic acid is used in combination with radical scavengers on.
- Free radical scavengers are substances that are able to bind free radicals.
- suitable radical scavengers are vitamin C, vitamin E, sterically hindered phenols and the HALS compounds known to the person skilled in the art ("hindered amine light stabilizer).
- Another object of the invention is a method for treating leather, wherein man wet blue at any point in the course of further processing to manufacture leather - preferably in the course of retanning - treated with gallic acid.
- the term "wet blue" familiar to the person skilled in the art is used in the context of the invention for Chrome-tanned hides are used regardless of whether you choose these hides according to their Manufacturing directly processed into ready-to-use leather or whether one is commercial available chrome-tanned skins, i.e. wet blue in the narrower sense, into one further processed into ready-to-use leather at a later date.
- the leather thus produced was tested for softness and fullness. The result can be seen in Table 1. Furthermore, the leather was aged at 80 ° C for 24 hours and then examined for its chromium VI content. The result can also be found in Table 1.
- Example 1 was repeated, but with the addition of the gallic acid according to example 1 was dispensed with (blind test). The result can be seen in Table 1.
- Example 1 according to the invention with regard to the Chromium VI content is superior to the comparative examples - in some cases very clearly.
- Another positive effect is that in terms of fullness and softness of the leather Example 1 according to the invention only insignificantly from comparison 1, the blank sample, differs.
- the use of vegetable tannins shows on the other hand, poorer quality results in the fullness and softness of the leather.
Landscapes
- 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)
- Fats And Perfumes (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (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)
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 B1 | 9 | 6,5 | 1,5 |
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 | 5,5 |
Gallussäure | 1,5 |
Claims (6)
- Verwendung von Gallussäure zur Stabilisierung von Chrom-III gegen Oxidation in chromgegerbtem Leder.
- Verwendung nach Anspruch 1, wobei man die Gallussäure im Zuge der Nachgerbung in chromgegerbtes Leder einbringt.
- Verwendung nach Anspruch 1 odaer 2, wobei man die Gallussäure in Kombination mit Reduktionsmitteln einsetzt.
- Verwendung nach einem der Ansprüche 1 bis 3, wobei man die Gallussäure 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 Gallussäure behandelt.
- Verfahren zur Behandlung von Leder, dadurch gekennzeichnet, daß man wet blue im Zuge der Nachgerbung mit Gallussäure behandelt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10031548 | 2000-06-28 | ||
DE10031548A DE10031548A1 (de) | 2000-06-28 | 2000-06-28 | Verwendung von Gallussäure zur Stabilisierung von Chrom-III gegen Oxidation in chromgegerbtem Leder |
PCT/EP2001/006863 WO2002000941A1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1297188A1 EP1297188A1 (de) | 2003-04-02 |
EP1297188B1 true EP1297188B1 (de) | 2004-09-15 |
Family
ID=7647123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01964997A Expired - Lifetime EP1297188B1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1297188B1 (de) |
AT (1) | ATE276376T1 (de) |
BR (1) | BR0111931A (de) |
DE (2) | DE10031548A1 (de) |
WO (1) | WO2002000941A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10358686B2 (en) | 2014-08-04 | 2019-07-23 | Citizen Watch Co., Ltd. | Leather or leather article and method for producing same, hexavalent chromium treatment agent, method for treating hexavalent chromium in crude leather or crude leather article |
JP6987844B2 (ja) * | 2017-03-10 | 2022-01-05 | シチズン時計株式会社 | 6価クロム処理用の粉末状組成物、錠剤および革の製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3935035A (en) * | 1973-06-05 | 1976-01-27 | Nippon Steel Corporation | Aqueous solution and method for surface treatment of metals |
DE19860610B4 (de) * | 1998-12-29 | 2010-02-18 | Schill + Seilacher Ag | Verfahren zur Inhibierung der Cr(VI)-Bildung in chromgegerbtem Leder und Verwendung von Antioxidantien hierfür |
-
2000
- 2000-06-28 DE DE10031548A patent/DE10031548A1/de not_active Withdrawn
-
2001
- 2001-06-19 BR BR0111931-1A patent/BR0111931A/pt not_active IP Right Cessation
- 2001-06-19 DE DE50103652T patent/DE50103652D1/de not_active Expired - Lifetime
- 2001-06-19 AT AT01964997T patent/ATE276376T1/de not_active IP Right Cessation
- 2001-06-19 WO PCT/EP2001/006863 patent/WO2002000941A1/de active IP Right Grant
- 2001-06-19 EP EP01964997A patent/EP1297188B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1297188A1 (de) | 2003-04-02 |
WO2002000941A1 (de) | 2002-01-03 |
BR0111931A (pt) | 2003-06-17 |
DE50103652D1 (de) | 2004-10-21 |
ATE276376T1 (de) | 2004-10-15 |
DE10031548A1 (de) | 2002-01-10 |
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