EP0624203A1 - Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application. - Google Patents

Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application.

Info

Publication number
EP0624203A1
EP0624203A1 EP92914101A EP92914101A EP0624203A1 EP 0624203 A1 EP0624203 A1 EP 0624203A1 EP 92914101 A EP92914101 A EP 92914101A EP 92914101 A EP92914101 A EP 92914101A EP 0624203 A1 EP0624203 A1 EP 0624203A1
Authority
EP
European Patent Office
Prior art keywords
aqueous
weight
tanning
supersaturated
aluminum triformate
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
Application number
EP92914101A
Other languages
German (de)
English (en)
Other versions
EP0624203B1 (fr
Inventor
Huber Rudolf Zauns
Jochen Hieber
Riese-Meyer Loert De
Christine Schroeder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0624203A1 publication Critical patent/EP0624203A1/fr
Application granted granted Critical
Publication of EP0624203B1 publication Critical patent/EP0624203B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C14C11/00—Surface finishing of leather
    • 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

Definitions

  • the invention relates to and describes a new, highly concentrated form of aluminum triformate in supersaturated, yet storage-stable, aqueous solution which is particularly suitable for use in the field of chrome-free or low-chrome mineral tanning of leather and / or furs.
  • aqueous high concentrates according to the invention are not only distinguished by the fact that the active ingredient component aluminum triformate is already predefined in the state of the aqueous solution, it has also been shown that a plurality of mineral tanning agents in this form of supply Improvements and simplifications for the field of tanning, finishing and finishing of leather and fur are given.
  • mineral tanning agents or auxiliaries such as aluminum-based fixing aids is becoming increasingly important in the manufacture and finishing of leather and furs. This is due to the not inconsiderable concerns from an ecological point of view of the chrome-based work equipment or auxiliary materials used to this day.
  • aluminum-based mineral tanning agents are used in particular in two forms, both of which are in solid form: egg on the one hand solid basic aluminum chloride and on the other hand finely crystalline solid aluminum triformate are offered and used as feedstock in the leather or fur industry.
  • the advantages are known that result from the simultaneous use of aluminum and lower carboxylic acids, for example in the form of the aluminum triformate.
  • the invention is based on the object of providing aqueous concentrates which contain the aluminum triformate in active ingredient concentrations well above its solubility in water, yet are sufficiently stable in storage and, in the leather-producing operation, by simple dilution into the concentration ranges of the aluminum material required in each case can be brought.
  • the solution to the problem of the invention is based on the finding that under certain conditions, which are described in detail below, highly concentrated aqueous active substance concentrates based on aluminum triformate can be produced which contain this valuable substance in a supersaturated but nevertheless storage-stable form. It has also been shown that the use of such forms of preparation of the mineral tanning agents or auxiliary substances can have further advantages which are noticeable, for example, in an unprecedented degree of liquor depletion.
  • the teaching according to the invention is based on the object of providing aqueous concentrates which contain the aluminum triformate in active ingredient concentrations well above its solubility in water, yet are sufficiently stable in storage and, in the leather-producing operation, by simple dilution into the concentration
  • a first embodiment of the invention accordingly relates to the use of aqueous solutions of mixtures of aluminum triformate with alkali metal and / or alkaline earth metal formate - hereinafter also referred to as "formate salts" - which are at least largely storage-stable and acidified, as a concentrated form of an aqueous dissolved mineral tanning agent based on aluminum triformate for chrome-free or low-chrome leather and / or fur tanning.
  • these supersaturated aqueous solutions of formate salts contain small amounts of selected acid-stable stabilizers.
  • selected acid-stable stabilizers Of particular importance in this context is the addition of butanetetracarboxylic acid as a stabilizer of the supersaturated active ingredient solutions, but selected organic polymer compounds are also suitable for the virtually unlimited storage stabilization of these supersaturated formate salt solutions.
  • the invention relates to supersaturated and acidic aqueous solutions of aluminum triformate in a mixture with sodium formate with solids contents of the formate salt mixtures of at least 35% by weight, preferably at least 40% by weight, which are stable in storage and which contain small amounts contain butane tetracarboxylic acid and / or xanthan gum as stabilizers.
  • the teaching according to the invention comprises, in a further embodiment, the use of these stabilized supersaturated aqueous formate salt solutions as water-dilutable, but already aqueous-dissolved aluminum triformiate preparation for use as a ger terei-auxiliaries with fixation and / or tanning effect in the tanning and / or dressing of leather and fur skins.
  • This earlier application describes a process for the preparation of an alkali and / or alkaline earth-containing aluminum triformate solution from an aluminate solution with formic acid, the process being characterized in that an aqueous alkali and / or alkaline earth metal containing alkali solution with a formic acid present neutralized and the precipitated solid transferred into an aluminum triformate solution while increasing the temperature.
  • Aqueous sodium aluminate lyes are preferably used in the reaction.
  • Weight ratios of sodium oxide / aluminum oxide can be used in a wide range of, for example, 5: 1 to 1: 5 in these aluminate solutions. Ranges from 2: 1 to 1: 2 are preferred here.
  • reaction parameters can be important for the preparation of a supersaturated aluminum triformate solution on this basis: It is usually necessary to add the formic acid and to add the aluminate solution dropwise.
  • the reaction proceeds in two steps. During the addition of lye, a gelatinous, easily movable precipitate increasingly forms in an exothermic reaction. In a second step, this can be brought back into solution by heating - after cooling, there is little or no re-precipitation.
  • Formic acid and aluminate liquor used in the formation of sodium formate and aluminum triformate in stoichiometric ratios.
  • tanning agents on the one hand and fixing aids on the other hand in leather extraction or leather finishing are not congruent terms.
  • selected tanning agents can also be used as fixing aids in leather finishing, but the term fixing auxiliary for leather finishing does not normally cover the field of tanning agents for leather production from suitably prepared natural hides.
  • teaching according to the invention with the application purpose concerned here for the highly concentrated supersaturated aqueous formate salt solutions based on aluminum triformate goes beyond the teaching of the earlier application mentioned.
  • small amounts of selected acid-resistant stabilizing agents are also used, the butane tetracarboxylic acid, in particular 1,2,3,4-butane tetracarboxylic acid, being of particular importance.
  • the butane tetracarboxylic acid in particular 1,2,3,4-butane tetracarboxylic acid, being of particular importance.
  • Even extremely high concentrations of the formate salts in the supersaturated aqueous solution which are particularly preferably in the range above 50% by weight and in particular in the range from approximately 55 to 60% by weight, are stabilized by adding small amounts of this stabilizer, that a month-long storage of the supersaturated concentrates is also possible using temperature fluctuations that are common in practice.
  • the supersaturated aqueous solutions of the formate salts described in accordance with the invention and to be used in accordance with the invention contain aluminum triformate in combination with in particular sodium formate. Salt mixtures of this type can be started easily of the inexpensive sodium aluminate solutions and their reaction with formic acid.
  • the formate salt solids content in the aqueous concentrates is at least about 35% by weight, preferably at least about 40% by weight. In the embodiments of particular interest according to the invention, the formate salt contents are above 50% by weight and in particular in the range from about 55 to 60% by weight.
  • mixing ratios of aluminum triformate to sodium formate can generally vary within a wide range, as disclosed in the earlier application DE 40 10930 mentioned above, mixing ratios of aluminum triformate to sodium formate are, however, for the teaching according to the invention preferred, which are in the range of about 0.5 to 2, based on the weight ratio of the two components as oxide, ie based on the weight ratio Al 2 O 3 to Na 2 O.
  • the proportions of formic acid on the one hand and formate-forming metal components on the other - in particular, therefore, aluminum and sodium - are chosen in the preferred production in a practically stoichiometric ratio.
  • Control of the pH of the supersaturated aqueous concentrates is expedient or necessary to ensure the storage stability of the supersaturated solutions in the sense according to the invention.
  • the pH values of the concentrates are weakly acidic values and in particular in the range not above pH 5.
  • the pH range from about 3 to 4 can be particularly suitable with regard to the degree of acidity of the aqueous concentrates.
  • the stabilizers according to the invention are, on the one hand, the 1,2,3,4-butanetetracarboxylic acid already highlighted, but also acid-stable, water-soluble and / or water-swellable polymer compounds, with the xanthan gum being of particular importance here comes to.
  • the stabilizing agents are expediently used in amounts below 5% by weight, based on the aqueous concentrate, and in particular in amounts of about 0.1 to about 2% by weight in the aqueous concentrate. It may be expedient to enter these stabilizing agents in the form of aqueous solutions - for example about 10% by weight aqueous solutions - or also after a pre-swelling in, for example, isopropanol in the mixture of active ingredients containing formate.
  • the concentrates according to the invention as mineral tanning agents for the production of chromium-free or low-chromium leathers and furs is the use of the butanetetracarboxylic acid as a stabilizer, which is preferably present here in amounts of about 0.5 to 1% by weight on aqueous concentrate - to which formate salt concentrates can be added.
  • Aqueous active substance preparations of this type show a practically unlimited storage stability even when the formate salt concentrations are at or above 50% by weight.
  • the stabilizing agent for example butane tetracarboxylic acid
  • the stabilizing agent can be added in the course of the preparation of the aqueous concentrates, for example before the final heating of the primary reaction mixture for the preparation of the supersaturated aqueous solutions.
  • the stabilizer can also be added subsequently to the finished concentrates in a final process step.
  • the forms of mineral tanning agents based on aluminum triformate described in accordance with the invention are notable for the tanning and dressing of leathers and skins by outstanding application-related advantages.
  • the good meterability, the easy distribution of the mineral tanning agent in the tanning liquor, the neutral odor, above all are to be listed
  • the good AI 2 O 3 absorption of the skin are to be listed.
  • Extensive comparative tests, which will be dealt with in the examples, have shown that when using comparatively lower aluminum triformate concentrations in the tanning liquors, comparable results are obtained with regard to the product properties as are known from the previously known processes for mineral aluminum tanning with those described corresponding products can be set on a solid basis.
  • DYNAFLOCK L sodium aluminate solution: 19% by weight of Na 2 O and 25% by weight of Al 2 O 3 ; Hüls AG
  • the dropping rate depended on the temperature of the reaction solution, which should not exceed 25 ° C.
  • the mixture was then stirred at 60 ° C. until a clear solution was obtained (about 10 minutes).
  • the clear, colorless solution contained 37.3% by weight of aluminum triformate (corresponding to 11.75% by weight of Al 2 O 3 ) and 19.6% by weight of sodium formate.
  • BTCA 1,2,3,4-butanetetracarboxylic acid
  • the concentrates according to the invention were used as tanning agents and compared with commercial products based on basic aluminum chloride or solid, fine-crystalline aluminum triformate.
  • the comparative products were the basic aluminum chloride complex salt sold by the applicant under the trade name "Pellutax ALP” with an aluminum content (Al 2 O 3 ) of 16 to 18% by weight and a basicity of approx. 20%, and that of Zschimmer and Schwarz distributed product "Novaltan AL” (about 23% Al 2 O 3 ) used.
  • the aluminum tannins stabilized according to the invention with BTCA initially contained significantly less active substance (aluminum compounds). However, these agents were better available for the tanning process. This resulted in cheaper fleet wasting. The difference between the aluminum triformate range in the fleet and the aluminum absorbed by the sheepskin is smaller than that of the comparison products.
  • two tanning agents based on aluminum were designed as liquid products according to the invention nium triformate / sodium formate, stabilized with BTCA.
  • the formate mixture EP-1 according to the invention produced according to Example 2 contained - based on the aqueous concentrate - 0.5% by weight of BTCA.
  • the formate mixture EP-2 according to the invention produced according to Example 2 contained - based on aqueous concentrate - 1.0% by weight of BTCA.
  • the two products were each stabilized with a 10% by weight aqueous BTCA solution.
  • the mineral tannins to be compared were used in the same amount by weight. In detail, the following was true: The tests were carried out with German pickled fur sheep files. Before tanning, the corresponding skin halves were shaved to a wool height of 20 mm, then trimmed and the weights of the skin halves adjusted.
  • the corresponding pimple halves which came from the same raw material and were specially softened, shredded, unwrapped, ashed, stained, degreased and unwound, ran in the same series were.
  • the weights of the pimples were set to the same value.
  • the basis for the calculation of the fleet quantity was the pimple weight of the skins.
  • the liquor ratio was 1:10.
  • the use of the chemicals was fixed at g / l and calculated accordingly.
  • Tanning liquor ratio 1:10, calculated on pimple weight, min. Means minutes.
  • the liquor pH of the various tanning agents was determined electrometrically a) before the addition of the Al tanning agent;
  • Al 2 O 3 content of the corresponding skin halves (Al 2 O 3 content at 0% H 2 O) is shown in Table 6 below.

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)

Abstract

L'invention décrit l'utilisation de solutions aqueuses sursaturées et ajustées à réaction acide ayant au moins une grande stabilité au stockage, composées de mélanges de triformiate d'aluminium avec des formiates alcalins et/ou alcalino-terreux, se présentant sous la forme commercialisée concentrée d'un tanin minéral soluble aqueux à base de triformiate d'aluminium, pour le tannage de cuirs et/ou de peaux, sans chrome ou à faible teneur en chrome. L'invention concerne, à cet égard, des solutions aqueuses de ce type sursaturées et apprêtées, présentant notamment une bonne stabilité au stockage, ajustées à réaction acide et renfermant en outre de faibles quantités de stabilisants, les stabilisants préférés étant l'acide 1,2,3,4-butane-tétracarboxylique et/ou une gomme au xanthane. L'invention concerne en outre l'application de ces formes commercialisées aqueuses sursaturées stabilisées de solutions de triformiate d'aluminium destinées à l'utilisation comme agents auxiliaires de tannage à effet de fixation et/ou de tannage, lors du tannage et/ou de l'apprêt de cuirs et de peaux.
EP92914101A 1991-07-15 1992-07-06 Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application Expired - Lifetime EP0624203B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4123357A DE4123357A1 (de) 1991-07-15 1991-07-15 Verduennbare aluminium-triformiat-gerbstoffe in hochkonzentrierter waessrig-geloester und lagerstabiler form und ihre verwendung
DE4123357 1991-07-15
PCT/EP1992/001518 WO1993002218A1 (fr) 1991-07-15 1992-07-06 Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application

Publications (2)

Publication Number Publication Date
EP0624203A1 true EP0624203A1 (fr) 1994-11-17
EP0624203B1 EP0624203B1 (fr) 1995-10-11

Family

ID=6436154

Family Applications (2)

Application Number Title Priority Date Filing Date
EP92111449A Pending EP0523507A1 (fr) 1991-07-15 1992-07-06 Agent de tannage diluable à base de triformiate d'aluminium sans forme de solution aqueuse très concentrée et stable au stockage et son utilisation
EP92914101A Expired - Lifetime EP0624203B1 (fr) 1991-07-15 1992-07-06 Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP92111449A Pending EP0523507A1 (fr) 1991-07-15 1992-07-06 Agent de tannage diluable à base de triformiate d'aluminium sans forme de solution aqueuse très concentrée et stable au stockage et son utilisation

Country Status (13)

Country Link
US (1) US5409501A (fr)
EP (2) EP0523507A1 (fr)
JP (1) JPH06508882A (fr)
AR (1) AR246768A1 (fr)
AT (1) ATE129021T1 (fr)
CA (1) CA2113548A1 (fr)
DE (2) DE4123357A1 (fr)
DK (1) DK0624203T3 (fr)
ES (1) ES2078054T3 (fr)
GR (1) GR3017901T3 (fr)
MX (1) MX9204155A (fr)
TR (1) TR26192A (fr)
WO (1) WO1993002218A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4428644A1 (de) * 1994-08-12 1996-02-15 Henkel Kgaa Verdünnbare Aluminiumtriformiat-Gerbstoffe in hochkonzentrierter und lagerstabiler Form und ihre Verwendung
US6936849B1 (en) 1997-07-29 2005-08-30 Micron Technology, Inc. Silicon carbide gate transistor
US6746893B1 (en) 1997-07-29 2004-06-08 Micron Technology, Inc. Transistor with variable electron affinity gate and methods of fabrication and use
US7154153B1 (en) 1997-07-29 2006-12-26 Micron Technology, Inc. Memory device
US6965123B1 (en) 1997-07-29 2005-11-15 Micron Technology, Inc. Transistor with variable electron affinity gate and methods of fabrication and use
US7196929B1 (en) 1997-07-29 2007-03-27 Micron Technology Inc Method for operating a memory device having an amorphous silicon carbide gate insulator
US6031263A (en) * 1997-07-29 2000-02-29 Micron Technology, Inc. DEAPROM and transistor with gallium nitride or gallium aluminum nitride gate
KR100283721B1 (ko) * 1998-03-16 2001-11-22 김호진 무공해성스플릿레더의제조방법
AU6095900A (en) 1999-07-20 2001-02-05 Munksjo Paper Decor, Inc. Aluminum compounds and process of making the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421723A (en) * 1917-12-06 1922-07-04 Chemical Foundation Inc Process for tanning with aluminium salts
GB136193A (en) * 1918-05-08 1919-12-18 William Clark Improvements in Tanning Animal Hides.
US2071567A (en) * 1935-04-13 1937-02-23 George R Pensel Combination tanning process
US2301637A (en) * 1941-01-31 1942-11-10 American Cyanamid Co Aluminum tanning process
DE3016875C2 (de) * 1980-05-02 1983-06-23 Röhm GmbH, 6100 Darmstadt Verfahren zur Konditionierung von Häuten und Fellen
DE4010930A1 (de) 1990-04-04 1991-10-10 Henkel Kgaa Verfahren zur herstellung einer alkali- und/oder erdalkalihaltigen aluminiumtriformiatloesung, hochkonzentrierte alkali- und/oder erdalkalihaltige aluminiumtriformiatloesungen und ihre verwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9302218A1 *

Also Published As

Publication number Publication date
CA2113548A1 (fr) 1993-02-04
MX9204155A (es) 1993-01-01
US5409501A (en) 1995-04-25
JPH06508882A (ja) 1994-10-06
EP0624203B1 (fr) 1995-10-11
DE59204020D1 (de) 1995-11-16
ATE129021T1 (de) 1995-10-15
ES2078054T3 (es) 1995-12-01
EP0523507A1 (fr) 1993-01-20
WO1993002218A1 (fr) 1993-02-04
TR26192A (tr) 1995-02-15
DK0624203T3 (da) 1996-02-05
GR3017901T3 (en) 1996-01-31
DE4123357A1 (de) 1993-01-21
AR246768A1 (es) 1994-09-30

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