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

Definitions

• reaction products of phenol and oleum are particularly suitable for component (A), the molar ratio (phenol) :( S0 3 ) being above all (1) :( 1.4-1.8).
• Component (A) is known per se.
• British Patent 683,084 the production of reaction products from phenol and oleum, which, however, with e.g. Formaldehyde and urea or thiourea are further implemented and also used as tanning agents.
• Component (A) used according to the invention is a mixture of polyhydroxy-polyphenylsulfonic sulfonic acids, which presumably contains a 3,3'-dihydroxydiphenylsulfone disulfonic acid as the main component.
• Component (B) preferably comes as primary, secondary or tertiary C 1 -C 4 -alkylamine, C 2 -C 3 -alkanolamine or C z -C 6 -alkylenediamine, especially mono-, di- or triethanolamine, dimethylethanolamine , Ethylenediamine and N-hydroxyethyl-ethylenediamine, as poly-C 2 -C 3 -alkylene-polyamine with 3 to 5 nitrogen atoms N, N-dimethylpropylenediamine, pentamethylenediamine, hexamethylenediamine, triethylenetetramine, and tetraethylenepentamine and as a heterocyclic amine especially from diethanolamine and sulfuric acid available morpholine.
• diethanolamine is the focus of interest.
• the ready-to-use tanning salts suitable for component (C) are described in the relevant specialist literature. These are usually chromium, aluminum, iron or zirconium salts. Examples of such salts are basic chromium (III) chloride or sulfate, a chrome alum, optionally basic aluminum chloride or sulfate, an alum, iron (III) chloride or sulfate, zirconium oxychloride and zirconium sulfate. Mixtures of the chromium and aluminum salts mentioned are also well suited for use as component (C). Preferred are, however, [CrCl 2 (OH 2 ) 4 ] Cl.
• the optional component (D) is used in the composition according to the invention, preference is given to the tetrasodium salt of ethylenediaminetetraacetic acid or the neutral or acidic sodium pyrophosphate (Na 4 P 2 0 7 or Na 2 H 2 P 2 O 7 ).
• the optional component (D) acts as a complexing agent and is preferably used in the composition in the case of an iron-free tanning agent, provided the iron content of the oleum used in the production of component (A) is relatively high.
• component (B) As a rule, at most 0.2 part by weight of component (B) per part by weight of component (A) is used in the composition.
• the weights of component (C) in the weight ratio of component (A) to component (C) are advantageously based on the metal atom of the corresponding tanning salts.
• chrome tanning salts as component (C)
• a maximum of 0.375 parts of chromium per part of component (A) can be used. Higher amounts of chromium would no longer be soluble in the composition and would lead to inhomogeneous compositions.
• preferred compositions contain components (A) and (C) in a weight ratio (A) :( C) of (1) :( 0.03 to 0.5), based on the metal atom of component (C), at most 0.375 parts of chrome are present.
• compositions which have as high a content of tanning salts as possible are desirable since the tanning salts as component (C) are cheaper in comparison with the reaction products of phenol and oleum as component (A), the tanning effect of the composition on both component (A) and also on the compo nente (C).
• compositions which contain components (A) and (C) in a weight ratio (A) :( C) of (1) :( 0.3 to 0.375) are particularly preferred.
• the compositions contain components (A) and (D) in a weight ratio (A) :( D) of (1) :( 0 to 0.04).
• compositions according to the invention have a water content of 40 to 80, preferably 45 to 62 percent by weight.
• the procedure is generally such that an aqueous solution of component (A) and, if appropriate, component (D) are first mixed with component (B) and then with component (C), which may be present as an aqueous solution .
• component (A) should first be diluted with water for safety reasons, giving about 50 to 70 percent by weight solutions of component (A).
• component (B) alone or in admixture with the optional component (D)
• component (A) and optionally component (D) with component (B) can be carried out in an aqueous medium with moderate external cooling at preferably 60 to 90 ° C.
• component (C) Only at the end is component (C) added to the mixture of components (A), (B) and optionally (D).
• Component (D) can be added as a solid with vigorous stirring. This is particularly true when using e.g. Aluminum tanning salts as component (C).
• component (C) When using chromium tanning salts, it has proven to be particularly advantageous to use component (C) as an aqueous solution, the aqueous solution of component (C) before mixing with components (A), (B) and optionally (D) is usually heated to 60 to 90 ° C. After all the components have been mixed, the composition is generally diluted with water to the preferred water content of 40 to 80 percent by weight.
• compositions according to the invention obtained in this way are liquid and are particularly suitable for tanning raw materials or for retanning leather of all kinds.
• the conventional methods are used to treat pale or pretanned leather with an aqueous solution which contains the aqueous composition according to the invention, and then to treat the tanned material in the usual way, e.g. by neutralizing, washing out, greasing and drying. If desired, staining can be done.
• 100 to 200, preferably 140 to 180 parts by weight of water and 5 to 40 parts by weight of the aqueous composition according to the invention are used per 100 parts by weight of leather or leather.
• 100 parts by weight, preferably descaled, of tanned material is tanned with 140 to 160 parts by weight of water and 10 to 20 parts of the composition according to the invention, or 100 parts by weight in the usual manner with chrome-tanned leather neutralized with, for example, formates or bicarbonates, with 140 to 160 parts by weight Retanned water and 5 to 15 parts of the composition according to the invention.
• the tanned material is rinsed and, if necessary, subsequently greased with a commercially available fatliquor based on, for example, sulfonated fish oil, sperm oil or claw oil. After drying, a light, brilliant leather is obtained, which has good lightfastness, a firm, compact, smooth grain and a soft handle.
• the composition according to the invention has the essential advantage of being particularly stable in storage thanks to the presence of component (B). Even after several months of storage, no clouding or flocculation can be found in the composition.
• composition comprising 166.5 parts of the reaction product from phenol and oleum, 15 parts of diethanolamine, 198 parts of Cr (OH) SO 4 (corresponding to 62.3 parts of chromium), 4 parts of tetrasodium salt of ethylenediaminetetraacetic acid and 616.5 Contains parts of water. After 3 months of storage, the composition remains homogeneous, ie shows no clouding or flocculation. A 1% solution of this composition has a pH of 2.9.
• a storage-stable composition is also obtained if instead of the 4 parts of tetrasodium salt of ethylenediaminetetraacetic acid and the 10 parts of diethanolamine, 3 parts of trisodium phosphate or 7.5 parts of N, N'-dimethyl-propane-diamine are used.
• Example 2 The procedure described in Example 2 is followed, except that a filtered solution which has been preheated to 70 ° C. and contains the following parts of tanning salt and water instead of the 45.78 parts of Al Z (OH) 4 SO 4 and the 484.72 parts of water
• reaction solution a filtered, preheated to 70 ° C solution of 145.46 parts of Cr (OH) SO 4 (corresponding to 45.82 parts of chromium) and 65.36 parts of Zr (OH) 2 S0 4 (corresponding to 26.82 parts of zirconium ) in 493 parts of water.
• the reaction solution is then kept under stirring at 70 ° C. for 20 minutes and then cooled to 20 ° C. 1000 parts of a composition are obtained which are stable on storage.
• a 1% solution of this composition has a pH of 2.4.
• compositions which are also stable in storage are obtained if instead of the 65.36 parts of Zr (OH) 2 SO 4 , 95.0 parts of ZrOCl 2 .8H 2 O or 106 parts of Zr (S0 4 ) 2 -4H 2 0 (all corresponding to 26 , 82 parts of zirconium) are used.
• 100 parts of decalcified veal pods are treated with 150 parts of water and 15 parts of the composition prepared according to Example 1 for 24 hours at 20 ° C. in a rolling barrel. After neutralizing, washing, greasing, stretching, drying, conditioning, studs and sperm, you get a tanned, lightly covered leather that has a full grain and a soft feel.
• Example 12 The procedure is as described in Example 12, but the following amounts of composition are used per 100 parts of veal pelvis a leather with properties similar to that of Example 12 is thus obtained.
• 100 parts of folded chrome grain calf leather are treated with 150 parts of water and 10 parts of the composition prepared according to Example 1 for 2 hours at 50 ° C. in a rolling barrel.
• the leather is neutralized with sodium formate and sodium bicarbonate using customary methods, washed, dyed with 1 part of the leather dye CI Acid Brown 189 and aftertreated with a commercially available fatliquor based on sulfonated fish oil.
• a tanned, brown-colored, brilliant leather is obtained, which also has a full grain and a soft handle.
• Example 17 One hardens as described in Example 17, but the following amounts of composition are used for 100 parts of folded chrome grain calf leather a leather with properties similar to that of Example 17 is thus obtained.

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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)
• Coloring (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=4219478

Family Applications (1)

Country Status (9)

Cited By (3)

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• 1987
  • 1987-04-27 US US07/042,770 patent/US4830632A/en not_active Expired - Lifetime
  • 1987-04-29 ES ES198787810273T patent/ES2033920T3/es not_active Expired - Lifetime
  • 1987-04-29 EP EP87810273A patent/EP0245205B1/fr not_active Expired - Lifetime
  • 1987-04-29 DE DE8787810273T patent/DE3781453D1/de not_active Expired - Lifetime
  • 1987-04-30 MX MX006305A patent/MX167001B/es unknown
  • 1987-05-01 JP JP62106462A patent/JP2886161B2/ja not_active Expired - Fee Related
  • 1987-05-04 AU AU72468/87A patent/AU604697B2/en not_active Ceased
  • 1987-05-04 BR BR8702226A patent/BR8702226A/pt not_active IP Right Cessation
  • 1987-05-04 PT PT84821A patent/PT84821B/pt not_active IP Right Cessation

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