DE821994C - Method of fixing the tanning agent in vegetable tanned leathers - Google Patents

Method of fixing the tanning agent in vegetable tanned leathers

Info

Publication number
DE821994C
DE821994C DEB2326A DEB0002326A DE821994C DE 821994 C DE821994 C DE 821994C DE B2326 A DEB2326 A DE B2326A DE B0002326 A DEB0002326 A DE B0002326A DE 821994 C DE821994 C DE 821994C
Authority
DE
Germany
Prior art keywords
fixing
tanning agent
vegetable tanned
tanned leathers
leather
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.)
Expired
Application number
DEB2326A
Other languages
German (de)
Inventor
Dr Richard Alles
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to DEB2326A priority Critical patent/DE821994C/en
Application granted granted Critical
Publication of DE821994C publication Critical patent/DE821994C/en
Expired 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
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • 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
    • C14C3/28—Multi-step processes

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)

Description

Verfahren zum Fixieren des Gerbstoffs in pflanzlich gegerbten Ledern Es ist bekannt, in pflanzlich gegerbtem Leder, wie Vacheleder, überschüssig eingelagerte, von der Hautsubstanz nicht gebundene Gerbstoffanteile durch Behandlung mit wäBrigen Lösungen von Harnstoff - Formaldehyd - Kondensationsprodukten zu fixieren. Indessen ist es bei Anwendung dieser Mittel nicht immer möglich, eine völlig gleichmäßige Durchfixierung des Leders zu erzielen.Process for fixing the tanning agent in vegetable tanned leathers It is known that vegetable-tanned leather, such as vacheleather, contains excess, Tannin components not bound by the skin substance through treatment with aqueous Fix solutions of urea-formaldehyde condensation products. Meanwhile it is not always possible to achieve a completely uniform treatment when using these means To achieve through fixing of the leather.

Es wurde nun gefunden, daB derartige Schwierigkeiten nicht auftreten, wenn man das Leder während oder nach der Gerbung mit in Wasser löslichen oder leicht vierteilbaren Kondensationsprodukten aus Harnstoff, Formaldehyd und mehrwertigen Alkoholen behandelt. Als geeignete Kondensationsprodukte seien beispielsweise solche aus Harnstoff und Formaldehyd, Äthylenglykol, Diglykol, Triglykol, Butandiol, Glycerin o. dgl. genannt. Diese Kondensationsprodukte können auch zusammen mit anderen geeigneten Stoffen, z. B. mit Leim, Casein, Zucker, dextrinartigen Stoffen, oder auch mit Bittersalz verwendet werden, insbesondere bei der Füllgerbung von Vacheleder.' Die in den nachstehenden Beispielen angegebenen Teile sind Gewichtsteile.It has now been found that such difficulties do not arise if you use the leather during or after tanning with water-soluble or slightly four-part condensation products of urea, formaldehyde and polyvalent ones Treated alcohol. Examples of suitable condensation products are those from urea and formaldehyde, ethylene glycol, diglycol, triglycol, butanediol, glycerine or the like. These condensation products can also be used together with other suitable Substances, e.g. B. with glue, casein, sugar, dextrin-like substances, or with Epsom salt can be used, especially in the filling tanning of Vacheleder. ' The ones in the following The parts given in the examples are parts by weight.

Beispiel i ioo Teile feuchtes Vacheleder werden nach der Gerbung 12 Stunden lang auf Stapel gelegt. Man gibt sodann das Leder in das Walkfaß und setzt nun 2 °/o des Ledergewichts an 5oo/oiger Lösung eines durch Umsetzung mit Äthylenglykol wasserlöslich gemachten Harnstoff-Formaldehyd-Harzes, hergestellt nach Patent 752 227, Beispiel i, hinzu und walkt 20 Minuten. Hierauf wird in üblicher Weise gefettet und noch 20 Minuten lang weiter gewalkt. Das fertig zugerichtete Vacheleder besitzt eine helle, gleichmäßige Narbenfarbe und weist nach der Analyse eine Verminderung des Gesamtauswaschcerlustes nach Procter um 4o bis 6o % auf. Beispiel e ioo Teile gemäß Beispiel i, Satz i, vorbehandeltes feuchtes Vacheleder werden mit einer I\iischung aus 2,5 Teilen einer :2o0/eigen Leimlösung und i Teil einer 5oo/oigen Lösung eines durch Einkondensieren von i, 4-Butandiol wasserlöslich gemachten Harnstoft-Formaldehyd-Kondensationsproduktes 20 Minuten lang gewalkt, worauf nachgefettet und fertig zugerichtet wird. Es wird ein besonders festes und gleichmäßig hellfarbiges Vacheleder mit stark herabgesetztem Auswaschverlust erhalten.Example 100 pieces of damp vachel leather are stacked on stacks for 12 hours after tanning. The leather is then placed in the drum and 2% of the leather weight is then added to 500% solution of a urea-formaldehyde resin made water-soluble by reaction with ethylene glycol, prepared according to Patent 752 227, Example 1, and drumming for 20 minutes. Then it is greased in the usual way and drummed for another 20 minutes. The finished vacheather has a light, even grain color and, according to the analysis, shows a reduction in the overall willingness to wash out according to Procter by 40 to 60%. EXAMPLE 100 parts according to example i, sentence i, pretreated damp vacheleder are made water-soluble with a mixture of 2.5 parts of a: 2o0 / own glue solution and 1 part of a 500 /% solution of a water-soluble by condensation of 1,4-butanediol Harnstoft formaldehyde condensation product is drummed for 20 minutes, after which it is re-greased and finished. A particularly strong and evenly light-colored Vacheleder with greatly reduced washout loss is obtained.

Claims (1)

PATENTANSPRUCH: Verfahren zum Fixieren des Gerbstoffs in pflanzlich gegerbten Ledern, dadurch gekennzeichnet, daß man das Leder während oder nach der Gerbung mit in Wasser löslichen oder leicht verteilbaren Kondensationsprodukten aus Harnstoff, Formaldehv-d und mehrwertigen Alkoholen behandelt.PATENT CLAIM: Process for fixing the tanning agent in vegetable tanned leather, characterized in that the leather during or after Tanning with condensation products which are soluble in water or easily spreadable treated from urea, formaldehyde and polyhydric alcohols.
DEB2326A 1950-03-01 1950-03-01 Method of fixing the tanning agent in vegetable tanned leathers Expired DE821994C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB2326A DE821994C (en) 1950-03-01 1950-03-01 Method of fixing the tanning agent in vegetable tanned leathers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB2326A DE821994C (en) 1950-03-01 1950-03-01 Method of fixing the tanning agent in vegetable tanned leathers

Publications (1)

Publication Number Publication Date
DE821994C true DE821994C (en) 1951-11-22

Family

ID=6952692

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB2326A Expired DE821994C (en) 1950-03-01 1950-03-01 Method of fixing the tanning agent in vegetable tanned leathers

Country Status (1)

Country Link
DE (1) DE821994C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022749B (en) * 1955-06-21 1958-01-16 Basf Ag Tanning of skin and bare

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022749B (en) * 1955-06-21 1958-01-16 Basf Ag Tanning of skin and bare

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