[article]
| Titre : |
Metal organic based syntan for multi-stage leather processing |
| Type de document : |
texte imprimé |
| Auteurs : |
Gladstone Christopher Jayakumar, Auteur ; Sangeetha Subramanian, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 288-294 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuirs et peaux -- Propriétés organoleptiques
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Syntans
Tannage au chrome
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage organique
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The leather industry in India and elsewhere have adopted a two stage processing methodology wherein hides/skins are processed up to wet blue in stage one, and subsequently converted to value added products in stage two. The process of rechroming carried out when wet blue leathers are sourced from various vendors thus attains significance. Many tanners prefer to employ chromium based synthetic tanning agents for rechroming, as against basic chromium sulfate, so as to provide for a tanning at higher pH values of above 3.5 – 4.0. Chromium based synthetic tanning agents in addition to employing masked chromium salts also provide for increased fullness to the leather. A significantly large number of these synthetic tanning agents are based on formaldehyde condensed aromatic intermediates, the use of which could result in the presence of free formaldehyde in the crust leathers. Instances of poorer raw material quality also call for the use of melamine-based syntans for preferential filling of the belly regions. In this work, the application of a chromium based melamine syntan devoid of the use of formaldehyde for condensation is reported. The product has been evaluated in tanning, rechroming and post tanning (as a retanning agent). In tanning, the product provides for a shrinkage temperature of 106oC, 3.25-3.75% Cr2O3 content (dry weight) alongside good belly filling. On use in rechroming or post tanning, the product provides for fuller leathers complete with physical properties meeting standard norms. The results indicate that the newly developed product has a significant scope in increasing the cutting value of the leathers by way of providing uniform substance alongside good tanning properties. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Preparation of chrome melamine syntan - Evaluation of the prepared syntan - Physico-chemical evaluation of the leather - Organoleptic properties - Scanning electron microscopy analysis of processed leathers
- RESULTS AND DISCUSSION : Chrome tanned leathers - Rechromed leathers - Wet end finished leathers |
| En ligne : |
https://drive.google.com/file/d/15dpG2BTSVuDHRNBt8jYg3g7VcK5mqpct/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24596 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 9 (09/2015) . - p. 288-294
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Metal organic based syntan for multi-stage leather processing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 9 (09/2015)
