EP1656460A1 - Procede de preparation d'un agent de tannage synthetique - Google Patents

Procede de preparation d'un agent de tannage synthetique

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Publication number
EP1656460A1
EP1656460A1 EP03817975A EP03817975A EP1656460A1 EP 1656460 A1 EP1656460 A1 EP 1656460A1 EP 03817975 A EP03817975 A EP 03817975A EP 03817975 A EP03817975 A EP 03817975A EP 1656460 A1 EP1656460 A1 EP 1656460A1
Authority
EP
European Patent Office
Prior art keywords
aromatic compound
reaction mixture
acid
range
mixture
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
EP03817975A
Other languages
German (de)
English (en)
Other versions
EP1656460B1 (fr
Inventor
Mookandi Kanthimathi
Palanisamy Thanikaivelan
Jonnalagadda Rao
Balachandran Unni Nair
Thirumalachari Ramasami
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.)
Council of Scientific and Industrial Research CSIR
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Council of Scientific and Industrial Research CSIR
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Filing date
Publication date
Application filed by Council of Scientific and Industrial Research CSIR filed Critical Council of Scientific and Industrial Research CSIR
Publication of EP1656460A1 publication Critical patent/EP1656460A1/fr
Application granted granted Critical
Publication of EP1656460B1 publication Critical patent/EP1656460B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/22—Chemical tanning by organic agents using polymerisation products
    • 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
    • C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
    • C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated

Definitions

  • the present invention relates to a process for the preparation of a synthetic tanning agent. More particularly the present invention provides a process for the preparation of a organo- polymeric substance, which is free from formaldehyde, using for tanning leather. This polymeric substance has enormous potential application as pretanning as well as retanning agent in leather processing industry.
  • Synthetic tanning agents are conventionally prepared by the condensation of naphthalene/phenol sulphonic acid or urea with formaldehyde as reported by Sharphouse (Leather Technicians Handbook, Vernon Lock Ltd., London, 1983). As reported by Stille and Campbell (High Polymer, 27, 14, 1972), the phenol- formaldehyde condensed product, which is essentially a low molecular weight resinous material, has always a possibility of eliminating unreacted phenol or formaldehyde, thereby posing a risk of adding to toxicity.
  • Denzinger et al (U.S. Patent 5,425,784, 1995) have prepared water-soluble graft polymers of monosaccharides, oligosaccharides, polysaccharides and derivatives with crotonic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid, citraconic anhydride, d -C 8 - alkyl- and hydroxyalkyl esters of acrylic acid, methacrylic acid or crotonic acid, mono- and di- C_ -C 8 -alkyl and -hydroxyalkyl esters of maleic acid, fumaric acid and citraconic acid, acrylamide, methacrylamide, niethacrolein, acrylamido-methylpropanesulfonic acid, N-vinylimidazole and mixtures, and used as a tanning agent for the self-tanning, pretanning, simultaneous tanning and retanning of pelts and skins. But these polymers do not produce leathers
  • Lakshminarayana et al (Journal of the American Leather Chemists Association, 85, 425, 1990) recommends an acrylic acid based syntan as retanning agent for chrome tanned leathers, which is prepared by the graft co- polymerization of acrylic ester and methacrylic acid onto a mixture of sulfated fish oil and alginic acid using free radical polymerization. But the major limitation associated with this product is that it leads to poor light fastness and heat resistance. Moreover, the acrylic syntans, which are generally attached to the protein through weak linkage, result in either low exhaustion in processing bath or more leaching out during subsequent wet operations. Christner et al (U.S.
  • patent No 4,961,750, 1990 have reported the preparation of thio containing chromium poly acrylate tanning agents by complexing the chromium ion and an acrylate polymer together with a heterocycle containing nitrogen, oxygen, or sulfur atom, having a molecular weight between 200 and 30,000, which can be offered to pickled skins or hides.
  • the main disadvantage in this tanning agent is the slow release of oxides of sulphur, which is carcinogenic.
  • the main objective of the present invention is to provide a process for the preparation of a synthetic tanning agent, which obviates the drawbacks as detailed above.
  • Another objective of the present invention is to prepare a chromium exhaust aid, which can be offered to delimed pelts along with commercial BCS thus avoiding pickling process thereby reducing the total dissolved solids in the effluent.
  • Still another objective of the present invention is to prepare a formaldehyde free polymeric network, which helps in preventing the precipitation of chromium at lower pH values.
  • Yet another objective of the present invention is to prepare a polymeric product, which can be used as a retanning agent and provides leathers with improved fullness, grain firmness with uniform dyeing.
  • the present invention provides a process for the preparation of synthetic organo-polymeric tanning agent essentially free from formaldehyde used for tanning leather, said process comprising the steps of: (a) reacting an aromatic compound with sulfuric acid at temperature in the range of 40 to 60°C to obtain sulfonized aromatic compound; (b) adding one or more organic ligands to the sulfonized aromatic compound obtained in step (a) and heating the mixture at temperature in the range of 60 to 80° C; 10 (c) adding one or more multi-functional polymers to the mixture of step (b) and heating the same at temperature in the range of 40 to 100° C to obtain a reaction mixture; (d) adding water to the reaction mixture of step (c) and adjusting the pH value of the same in the range of 3.0 to 3.5;and (e) optionally, aerating the reaction mixture and drying the reaction mixture of step (d) to obtain the synthetic organo-polymeric tanning agent.
  • the aromatic compound 20 used contains 1-14 carbon atoms.
  • step (a) the aromatic compound is reacted with sulfuric acid for a time period in the range of 50 to 250 minutes.
  • step (a) 1 to 5 moles of sulfuric acid is used per mole of aromatic compound.
  • the aromatic compound used is selected from the group consisting of naphthene, anthracene, or phenol.
  • the organic ligand used is selected from the group consisting of formic acid, citric acid, phthalic acid, salicylic acid, oxalic acid or their sodium salts ether individually or in combination.
  • 0.01 to 0. mole of organic ligand is used per mole of the aromatic compound.
  • the multi-functional polymer is selected from the group consisting of polyacrylic acid, methacrylic acid or mixture thereof.
  • step (c) 0.001 to 0.01 mole of multifunctional polymer is used per mole of the aromatic compound.
  • step (d) 5 to 25 moles of 10 water per mole of aromatic compound is added to the reaction mixture.
  • step (d) the pH of the reaction mixture is adjusted by adding sodium bicarbonate or by sodium hydroxide solution.
  • step (e) the reaction mixture is aerated by passing air /inert gas through the same.
  • reaction mixture is aerated for the time period in the range of 30 to 60 minute.
  • reaction mixture is dried either by drum drying or by spray drying.
  • reaction mixture is dried at temperature in the range of 130 to 260°C.
  • An aromatic compound having up to 14 carbon atoms is sulfonated by known method using 1 - 5 moles sulfuric acid per mole of aromatic compound for a period of not less than 90 min at a temperature in the range of 40 - 160°C.
  • the temperature of the reaction mass is then adjusted in the range of 60 - 80°C and an aqueous mixture of 0.01 - 0J mole of organic ligand per mole of aromatic compound is added to the said mass.
  • 0.0001 - 0.01 mole of multi functional polymer per mole of aromatic compound is then added to the said reaction mixture.
  • Heating is allowed to continue for a period not less than 60 minutes at a temperature in the range of 60 - 80°C, pH of the resulting mixture is then adjusted at a range of 3.0 - 3.5 by known method to obtain the synthetic tanning agent in slurry form.
  • the above slurry is subjected, as optional step, to aeration for a period of 30-60 minutes followed by conventional drying at a temperature in the range of 130 - 260°C to obtain the synthetic tanning agent in powder form.
  • the novelty and non-obviousness of the present invention lies in polymerizing the multi functional polymer with sulfonated aromatic compound, pretreated with organic ligand, thereby forming an organo-polymeric matrix, free from formaldehyde, having potential application in leather industry for not only ensuring an eco-friendly approach in chrome tanning by way of eliminating the conventional pickling process and the resulting problem of total dissolved solids (TDS) associated with the effluent, but also suggesting an exhaust aid for chrome because of its multiple carboxyl groups, thereby ensuring an economical eco-benign approach for leather tanning.
  • TDS total dissolved solids
  • Example 1 500 gms of naphthalene and 771 ml of concentrated sulfuric acid were taken into a 2 litre round bottom flask fitted with a stirrer. The contents of the flask were heated for 180 minutes at 40°C with constant stirring. A drop of the resulting mass was taken in a beaker and 2 ml of water was added to the beaker with shaking. A clear solution, without free naphthalene smell was obtained. This confirms the completion of sulfonation.
  • the sulfonated mass was transferred to a reactor fitted with a thermometer, stirrer and a dropping funnel. The mass was stirred continuously for a period of 10 min while maintaining the temperature at 60°C. A mixture of 14 gms sodium citrate, 17 gms phthalic acid, 11 gms sodium formate in 70 ml of water was added to the above sulfonated mass and stirring was continued at 60°C.
  • the product was offered to delimed goatskins at an offer of 1.5% along with 5% BCS at a float of 20%.
  • the drum was run for 1 hr and 80% water was added. Running was continued for another hr and the penetration was assessed by checking uniform blue color along the cut section. The pH of the solution and the cut section was found to be 4.2.
  • the bath was drained and the wet blue leathers were piled. Next day the leathers were post tanned using a conventional upper leather-processing recipe. The chromium exhaustion of the spent tan liquor was found to be 94%. The fullness of the crust leathers was found to be superior to that of conventional chrome tanned leathers.
  • Example 2 534 gms of anthracene and 326 ml of concentrated sulfuric acid were taken in a 2 litre round bottom flask fitted with a stirrer. The contents of the flask were heated to 140°C for 90 minutes with continuous stirring, ml of the mass was taken in a beaker and 3 ml water was added with shaking. It was observed to forma clear solution without free naphthalene smell, confirming the completion of sulfonation. The sulfonated mass was transferred to a reactor fitted with a thermometer, stirrer and a dropping funnel. The mass was stirred continuously for a period of 10 min. while maintaining the temperature at 80°C.
  • the pH of the mass was raised to 3 by adding a solution of 220 gms of sodium hydroxide in 500ml water, followed by the addition of an aqueous solution of 200 gms of sodium carbonate in 400ml water.
  • the slurry was aerated for 45 minutes conventionally and filtered using a cloth of pore size 5- lO ⁇ .
  • the filtrate was spray dried at 260°C and the white powder was stored in a plastic container.
  • the prepared syntan was added to the delimed sheepskins at an offer of 1.0% along with 5% BCS at a float of 20%.
  • the drum was run for 1 hr and 80% water was added. Running was continued for another hr and the penetration was assessed by checking uniform blue color along the cut section. The pH of the solution and the cut section was 10 found to be 4.4.
  • the bath was drained and the wet blue leathers were piled. Next day the leathers were post tanned using a conventional garment leather processing recipe. The chromium exhaustion of the spent tan liquor was found to be 95%. The fullness of the crust leathers was found to be superior to that of conventional chrome tanned leathers.
  • Example 3 94 gms of phenol and 54 ml of concentrated sulfuric acid were taken in a 250 ml round bottom flask fitted with a stirrer. The contents of the flask were heated to 80°C for 100 minutes with continuous stirring. 1 ml of the resulting mass was taken in a beaker and 3 ml water was added. On shaking, a clear solution was obtained confirming the completion of sulfonation. The sulfonated mass was transferred to a reactor fitted with a 20 thermometer, stirrer and a dropping funnel. The mass was stirred continuously for a period of 10 min while maintaining the temperature at 80°C. A mixture of 1J gm citric acid, 0.28 gm salicylic acid and 0.56 gms sodium phthalate dissolved in 10 ml of water was added to the above sulfonated mass and stirring was continued at 70°C.
  • the product was offered to delimed cow sides at an offer of 1.5% along with 8% BCS at a float of 20%.
  • the drum was run for 2 hrs and 80% water was added. Running was continued for another 4 hrs and the penetration was assessed by checking uniform blue color along the cut section. The pH of the solution and the cut section was found to be 4.0.
  • the bath was drained and the wet blue leathers were piled. Next day the leathers were post tanned using a conventional upper leather processing recipe. The chromium exhaustion of the spent tan liquor was found to be 92%. The fullness of the crust leathers was found to be superior to that of conventional chrome tanned leathers.
  • Example 4 256 gms of naphthalene and 544 ml of concentrated sulfuric acid were taken in a 2 litre round bottom flask fitted with a stirrer. The contents of the flask were heated to 160°C for 90 minutes. 1 ml of the resulting m ass w as taken in a beaker and 2ml water was added to the mass with shaking. It was observed that the solution was clear indicating the completion of sulfonation. The sulfonated mass was transferred to a reactor fitted with a thermometer, stirrer and a dropping funnel. The mass was stirred continuously for a period of 10 min. while maintaining the temperature at 80°C. A mixture of 8.4 gms citric acid, 16.6 gms phthalic acid and 4 gms sodium formate dissolved in 50 ml water was added to the above sulfonated mass and stirring was continued at 80°C.
  • a mixture of 20 gms poly methacrylic acid and 5 gms polyacrylic acid was added to the sulphonic acid mixture and the mixture was heated to 60°C for 1 hour.
  • a small portion of the reaction mixture was taken in a beaker and 2 ml water was added to the mass.
  • the pH of the solution in the beaker was adjusted to 3.5 and a clear solution was obtained indicating the completion of the reaction.
  • About 900 ml of water was added to the mass and is transferred to a bucket after cooling the reaction mass to room temperature.
  • the pH of the mass was raised to 3.5 by adding a solution of 100 gms of sodium hydroxide dissolved in 200 ml water, followed by the addition of a solution of 300 gms sodium bicarbonate dissolved in 600 ml water.
  • the slurry was filtered using a cloth of pore size 5- 10 ⁇ .
  • the filtrate was drum dried at 130°C and the white powder was stored in a plastic container.
  • the product was offered to delimed buff calfs at an offer of 1.5% along with 8% BCS at a float of 20%.
  • the drum was run for 2 hrs and 80% water was added. Running was continued for another 4 hrs and the penetration was assessed by checking uniform blue color along the cut section. The pH of the solution and the cut section was found to be 4.0.
  • the bath was drained and the wet blue leathers were piled. Next day the leathers were post tanned using a conventional upper leather-processing recipe. The chromium exhaustion of the spent tan liquor was found to be 94%.
  • the fullness of the crust leathers was found to be superior to that of conventional chrome tanned leathers.
  • the polymeric product is freely soluble in water and hence can be offered along with basic chromium sulfate on delimed pelts.
  • the process ensures no precipitation of chromium when it is offered on delimed pelts at a pH in the range of 8 - 8.5.
  • the process ensures high uptake of chromium when compared to normal wet blue process.
  • the polymer is incorporated with aromatic sulphonic acids to impart fullness to the tanned leathers.
  • the product produces wet blue leathers with required fullness apart from serving as chrome exhaust aid.
  • the product can be used a co-tanning agent along with BCS and as a retanning agent.
  • the shelf life of the product is about 5-2 years.
  • the tanned leathers do not undergo photo oxidation since it does not contain any active methylene groups in the system unlike in other condensed tanning agents.

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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)

Abstract

Un procédé de préparation d'un agent de tannage synthétique consiste à polymériser un polymère polyvalent au moyen d'un composé aromatique sulfoné, prétraité avec un ligand organique, pour former une matrice polymère organique dépourvue de formaldéhyde. Ce produit se prête à une utilisation potentielle dans l'industrie du cuir, non seulement pour permettre un tannage au chrome respectueux de l'environnement dans la mesure où on élimine le procédé de picklage classique et le problème associé aux matières dissoutes totales (MTS) dans l'effluent, mais également pour favoriser éventuellement l'épuisement du chrome en raison de ses groupes carboxyliques multiples. Ce produit peut également être utilisé comme agent de retannage dans le traitement du cuir.
EP03817975A 2003-08-12 2003-08-12 Procede de preparation d'un agent de tannage synthetique Expired - Fee Related EP1656460B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2003/003592 WO2005014865A1 (fr) 2003-08-12 2003-08-12 Procede de preparation d'un agent de tannage synthetique

Publications (2)

Publication Number Publication Date
EP1656460A1 true EP1656460A1 (fr) 2006-05-17
EP1656460B1 EP1656460B1 (fr) 2009-04-01

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EP03817975A Expired - Fee Related EP1656460B1 (fr) 2003-08-12 2003-08-12 Procede de preparation d'un agent de tannage synthetique

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EP (1) EP1656460B1 (fr)
CN (1) CN100535126C (fr)
AU (1) AU2003250493B2 (fr)
DE (1) DE60327001D1 (fr)
WO (1) WO2005014865A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102260763B (zh) * 2011-06-23 2013-09-25 陕西科技大学 一种改性壳聚糖两性聚合物复鞣剂及其制备方法
CN103667544A (zh) * 2013-11-07 2014-03-26 齐河力厚化工有限公司 一种高吸收铬鞣剂及其制备方法
CN104450991B (zh) * 2014-09-26 2017-02-22 山东力厚轻工新材料有限公司 一种不浸酸铬粉及其制备方法
CN107400738B (zh) * 2017-08-15 2019-09-10 陕西科技大学 两性酚类合成鞣剂及其制备方法
CN107619890B (zh) * 2017-08-24 2020-09-29 南通市宏飞橡胶制品有限公司 一种复合鞣剂

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Publication number Priority date Publication date Assignee Title
ES2066189T3 (es) * 1989-11-13 1995-03-01 Ciba Geigy Ag Procedimiento para la preparacion de cueros y pieles.
US5629376A (en) * 1990-10-31 1997-05-13 Peach State Labs, Inc. Polyacrylic acid compositions for textile processing
DE4131202A1 (de) * 1991-09-19 1993-03-25 Bayer Ag Verfahren zur herstellung von chromleder

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Title
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Also Published As

Publication number Publication date
EP1656460B1 (fr) 2009-04-01
DE60327001D1 (de) 2009-05-14
CN100535126C (zh) 2009-09-02
AU2003250493A1 (en) 2005-02-25
CN1839207A (zh) 2006-09-27
WO2005014865A1 (fr) 2005-02-17
AU2003250493B2 (en) 2009-05-28

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