EP0775218A1 - Dilutable aluminium triformiate tanning substances in highly concentrated and storage stable form and their use - Google Patents
Dilutable aluminium triformiate tanning substances in highly concentrated and storage stable form and their useInfo
- Publication number
- EP0775218A1 EP0775218A1 EP95929795A EP95929795A EP0775218A1 EP 0775218 A1 EP0775218 A1 EP 0775218A1 EP 95929795 A EP95929795 A EP 95929795A EP 95929795 A EP95929795 A EP 95929795A EP 0775218 A1 EP0775218 A1 EP 0775218A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- use according
- aqueous
- acid
- weight
- formate
- 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.)
- Withdrawn
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
- C14C3/08—Chemical tanning by organic agents
-
- 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
Definitions
- the invention relates to clear, bright, highly concentrated forms 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.
- mineral tanning agents or auxiliaries such as fixing agents based on aluminum is becoming increasingly important in the manufacture and finishing of leather and skins. This is due to the not inconsiderable concerns from an ecological point of view of the chromium-based work equipment or auxiliary materials of this type that are still used to this day.
- aluminum-based mineral tanning agents are used, in particular, in two forms, both of which are in solid form: on the one hand, solid basic aluminum chloride and, on the other hand, fine-crystalline, solid aluminum triformate are offered and used as feedstock in the leather or furskin industry.
- the advantages are known which result from the simultaneous use of aluminum and lower carboxylic acids, for example in the form of the aluminum triformate.
- a disadvantage in this connection is the comparatively low solubility of the pure crystalline aluminum triformate in aqueous solutions, which is below 5% by weight at usual tanning temperatures.
- EP-A-523 507 describes the use of aqueous solutions of mixtures of aluminum triformate with alkali metal and / or alkaline earth metal formate, which are at least largely storage-stable and acidified, and are acidified - hereinafter also referred to as "formate salts" - as a concentrated form of supply of an aqueous-dissolved mineral tanning agent based on aluminum triformate for chrome-free or low-chrome leather and / or fur tanning.
- the concentrates can be acid-stable stabilizers such as butane tetracarboxylic acid or organic polymer compounds, e.g. Xanthan gum can be added.
- butanetetracarboxylic acid has the disadvantage that the concentrates can partially separate into a gel phase and a supernatant aqueous phase.
- the object of the invention is to provide improved forms of the concentrates known from EP-A-523 507. These forms of offer had to be demanded, in particular, that they were present in clear and bare form, even when stored.
- aqueous solutions of mixtures of aluminum triformate with alkali and / or alkaline earth formate 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 perform the stated task excellently if they contain acid-resistant water-soluble and / or water-swellable polymer compounds of the low molecular weight polycarboxylic acid type with average molecular weights in the range from 500 to 10,000.
- the present invention accordingly relates to the use of at least largely storage-stable supersaturated and acidic aqueous solutions of mixtures of aluminum triformate with alkali and / or alkaline earth formate 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, the aqueous concentrates being acid-resistant water-soluble and / or water-swellable polymer compounds of the type of low molecular weight polycarboxylic acids with average molecular weights in Range from 500 to 10,000 included.
- Polycarboxylates which are selected from the group of homo- and copolymers of acrylic and maleic acid are preferably used, the average molecular weight of the polymers being in the range from 500 to 5,000 and in particular in the range from 800 to 2,000. Copolymers of acrylic acid and maleic acid in which the maleic acid content in the copolymer is at least 50% by weight are particularly preferred.
- DE-A 40 10930 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 containing aluminate solution is also used neutralized a formic acid and transferred the precipitated solid with an increase in temperature in an aluminum triformate solution.
- 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 production of a supersaturated aluminum triformate solution on this basis: It is generally necessary to add the formic acid and to add the aluminum hydroxide solution dropwise.
- the reaction proceeds in two steps. During the addition of lye, a gelatinous, easily movable precipitate is increasingly formed in an exothermic reaction. This can be in a second step can be brought back into solution by heating or by adding a stabilizer.
- formic acid and aluminate liquor are used in stoichiometric ratios with regard to the formation of sodium formate and aluminum triformate.
- the supersaturated aqueous solutions of the formate salts according to the invention contain aluminum triformate in combination with, in particular, sodium formate. Salt mixtures of this type can be prepared in a simple manner starting from 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 which are particularly interesting according to the invention, the formate salt contents are above 50% by weight and in particular in the range from about 55 to 50% by weight.
- mixing ratios of aluminum triformate to sodium formate can fundamentally fluctuate within a wide range, as is disclosed in the previously mentioned older application DE 40 10930, 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 Al2O3 to Na2 ⁇ .
- the proportions of formic acid on the one hand and formate-forming metal components on the other hand - in particular therefore aluminum and sodium - are chosen in the preferred production in a practically stoichiometric ratio.
- a 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 below 5.
- the pH range from about 3.5 to 4.5 can be particularly suitable with regard to the acidity of the aqueous concentrates to be set.
- the low molecular weight polycarboxylic acids according to the invention 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 add these stabilizers in the form of aqueous solutions - for example about 40% by weight aqueous solutions - to the active substance mixture containing formate salts.
- the stabilizing polycarboxylic acids can be added in the course of the production of the aqueous concentrates - for example after the neutralization reaction has taken place or the primary reaction mixture has been combined to produce the supersaturated aqueous solutions.
- the stabilizer can also be metered in during the reaction of formic acid with aluminate or be introduced directly in a mixture with formic acid.
- the concentrates to be used according to the invention contain butane tetracarboxylic acid and / or xanthan gum in addition to the obligatory polycarboxylic acids as additional stabilizers.
- the forms of mineral tanning agents based on aluminum triformate described according to the invention are notable for outstanding tanning advantages in the tanning and dressing of leathers and skins.
- Comparative tests have shown that when using comparatively lower aluminum triforate concentrations in the tanning liquors, comparable results are obtained with regard to the product properties as are set according to the previously known processes for mineral aluminum tanning with the corresponding solid-based products described.
- this is associated with a high level of exhaustion of the fleets, not only is the percentage degree of exhaustion of the fleet very high, but also the residual aluminum content in the fleet is significantly reduced.
- Example 1 was repeated, but the amount and / or the type of stabilizing addition of polycarboxylate were varied. Details can be found in Table 1 below. Comparative Examples 1 and 2 (VI - V2)
- Example 1 was repeated, except that 0.6% by weight of compounds "A” and "B", that is to say polycarboxylates with average molecular weights of 20,000 and 80,000, were added as stabilizers. Details can be found in Table 1 below.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944428644 DE4428644A1 (en) | 1994-08-12 | 1994-08-12 | Dilutable aluminum triformate tannins in highly concentrated and storage-stable form and their use |
DE4428644 | 1994-08-12 | ||
PCT/EP1995/003106 WO1996005327A1 (en) | 1994-08-12 | 1995-08-04 | Dilutable aluminium triformiate tanning substances in highly concentrated and storage stable form and their use |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0775218A1 true EP0775218A1 (en) | 1997-05-28 |
Family
ID=6525574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95929795A Withdrawn EP0775218A1 (en) | 1994-08-12 | 1995-08-04 | Dilutable aluminium triformiate tanning substances in highly concentrated and storage stable form and their use |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0775218A1 (en) |
DE (1) | DE4428644A1 (en) |
TR (1) | TR199500975A2 (en) |
WO (1) | WO1996005327A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103045776A (en) * | 2012-12-14 | 2013-04-17 | 常熟常圣服饰有限公司 | Method for producing fur clothes |
CN103060490B (en) * | 2013-01-17 | 2015-02-11 | 陕西科技大学 | Tanning method for tanning sheepskin clothing leather by hyperbranched polymer-aluminum salt tanning agent |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2942930A (en) * | 1958-11-07 | 1960-06-28 | Fred P Luvisi | Alum tannage |
DE3529248A1 (en) * | 1985-08-16 | 1987-02-26 | Bayer Ag | TERPOLYMERISATE |
DE4123357A1 (en) * | 1991-07-15 | 1993-01-21 | Henkel Kgaa | RENEWABLE ALUMINUM TRIFOROMATE FUELS IN HIGHLY CONCENTRATED WAESSRIG-GELOESTER AND STORAGE-STABLE FORM AND ITS USE |
-
1994
- 1994-08-12 DE DE19944428644 patent/DE4428644A1/en not_active Withdrawn
-
1995
- 1995-08-04 EP EP95929795A patent/EP0775218A1/en not_active Withdrawn
- 1995-08-04 WO PCT/EP1995/003106 patent/WO1996005327A1/en not_active Application Discontinuation
- 1995-08-08 TR TR95/00975A patent/TR199500975A2/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9605327A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4428644A1 (en) | 1996-02-15 |
WO1996005327A1 (en) | 1996-02-22 |
TR199500975A2 (en) | 1996-06-21 |
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Legal Events
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17P | Request for examination filed |
Effective date: 19970203 |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 19980623 |