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
  • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers

Definitions

• the invention relates to a method which increases the effectiveness of fluorochemicals which are used for the simultaneous hydrophobization and oleophobicization of leather.
• the method can be used before or during each operation after tanning, but preferably after acidification.
• the method is applicable to intermediate and non-intermediate (directly processed) leathers.
• the object of the invention was therefore to find auxiliaries which ensure a constant effectiveness of the fluorinated impregnating chemicals acting on the surface, regardless of the mode of operation or of the chemicals previously introduced into the leather.
• a process has now been found for the hydrophobization and oleophobicization of leather by impregnation with fluorochemicals by treating the leather with resins, quaternary ammonium compounds, amines or polymers before or simultaneously with the impregnation with the fluorochemicals. If these products are used before or together with the fluorochemicals, the effectiveness of these fluorochemicals increases and is no longer influenced by the working method or by the chemicals previously introduced into the leather.
• Suitable resins for this process are condensation products of formaldehyde with melamine (molar ratio 3: 1 to 12: 1, preferably 4: 1 to 6: 1), dicyandiamine (molar ratio 1: 1 to 3: 1), urea (molar ratio 1: 1 to 3: 1, preferably 1.5: 1 to 2.8: 1), phenol (molar ratio 0.5: 1 to 2: 1), naphthol (molar ratio 0.5: 1 to 2: 1) and aromatic sulfonic acids, preferably naphthalenesulfonic acid (molar ratio 3: 1 to 12: 1, preferably 5: 1 to 8: 1).
• R1 and R2 are the same or different and C1-C20-alkyl or C2-C20-alkenyl
• R3 and R4 are the same or different and C1-C4-alkyl or benzyl
• a ⁇ is an anion such as chloride, methosulfate , Mean methophosphate.
• R5 is C7-C20-alkyl or C7-C20-alkenyl
• R6 is C1-C2 Alkyl-alkyl
• R7 is C1-C4-alkyl or benzyl.
• Suitable polymeric compounds are polymers which can be polymerized in various proportions from the following monomers: Acrylic acid and its methyl, ethyl, propyl, butyl, hexyl, methylhexyl, octadecyl ester Methacrylic acid and its methyl, ethyl, propyl, butyl, hexyl, methylhexyl, octadecyl ester, acrylamide, acrylonitrile, vinyl acetate, ethylene, styrene, maleic anhydride.
• Maleic acid maleic acid mono- and diesters, N-vinlyl-N-methylacetamide, acrylamidomethylene propyl sulfonate, vinyl formamide, glycidyl methacrylate, diallyldimethylammonium chloride.
• the molecular weights of these polymers are in the range 2,000 to 50,000, preferably 5,000 to 20,000.
• Polymers of 60 to 80% vinyl acetate and 20 to 40% ethylene or 30 to 60% styrene and 40 to 70% maleic anhydride are preferred.
• fluorine-containing impregnation chemicals are: fluorocarbon resins, fluorinated addition, polymerization and condensation products, perfluorinated urethanes, ureas, esters, sulfonamides, carbamides, amines, carboxylic acids, alcohols, fluorinated alkyl and aryl compounds, oxyethylated perfluoroalcohols.
• Preferred reaction products are those which are prepared from the following compounds: perfluoroalkylethanol and alkyl or phenyl isocyanate; Perfluoroalkylethanol with epichlorohydrin and alkyl or phenyl isocyanates; polymeric perfluoroacrylates.
• the perfluoroalkyl groups usually contain 4 to 16 carbon atoms.
• the above-mentioned resins, quaternary ammonium compounds, amines or polymers can either be applied to the leather together with the fluorochemicals or in a separate treatment step after tanning, preferably after acidification.
• the amount of these compounds is 0.05 to 10% by weight, based on the shaved weight, or 0.1 to 20% by weight, based on the dry weight.
• the leather is treated with the fluorochemicals and the auxiliaries mentioned in the usual way either by impregnation with a solution, emulsion or dispersion of the products mentioned in one or two steps as outlined above. This impregnation is done by spraying, in an immersion bath, in a barrel, in a mixer or in a reel.
• the method according to the invention can also be combined with a filling impregnation which closes the fiber interspaces, as mentioned at the beginning.
• example 1 Starting material: Chrome tanned, retanned and greased crust; the percentages are based on the dry weight of the leather 1000.0% Water 45 ° C 2.0% 25% ammonia Walk 2 hours new fleet 400.0% Water 45 ° C 1.0% Condensation product of formaldehyde and ⁇ -naphthalenesulfonic acid 2.0% dye Walk for 1 hour Additive: 1.5% Formic acid 85% Walk 20 minutes new fleet 400.0% Water 45 ° C 2.0% dye Walk 30 minutes Additive: 0.5% Formic acid 85% Walk 20 minutes new fleet 400.0% Water 45 ° C 0.5% Formic acid 85% 1.0% Condensation product from formaldehyde with dicyandiamine (44%) 4.0% fluorinated impregnating agent (17% active ingredient) Walk 20 minutes rinse, tension, dry (50 ° C), millen Starting material: Folded

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)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=6334350

Family Applications (1)

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Cited By (2)

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Citations (3)

Family Cites Families (3)

• 1987
  • 1987-08-24 DE DE19873728162 patent/DE3728162A1/de not_active Withdrawn
• 1988
  • 1988-08-16 EP EP88113247A patent/EP0306733B1/fr not_active Expired - Lifetime
  • 1988-08-16 DE DE8888113247T patent/DE3870772D1/de not_active Expired - Fee Related
  • 1988-08-16 ES ES88113247T patent/ES2042662T3/es not_active Expired - Lifetime
  • 1988-08-22 US US07/235,037 patent/US4971835A/en not_active Expired - Fee Related
  • 1988-08-23 KR KR1019880010684A patent/KR960010049B1/ko not_active Expired - Lifetime
  • 1988-08-23 JP JP63207480A patent/JPS6469700A/ja active Pending

Patent Citations (3)

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