A novel pre-tanning agent for high exhaustion chromium tannage / Luan Shifang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 4 (07-08/2007) . - p. 149-153 Titre : A novel pre-tanning agent for high exhaustion chromium tannage Type de document : texte imprimé Auteurs : Luan Shifang, Auteur ; Liu Yan, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur ; Duan Zhenji, Auteur Année de publication : 2007 Article en page(s) : p. 149-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Agents de tannage Cuirs et peaux -- Propriétés physiques Epuisement des tanins Groupement carboxyle Oxazolidine Prétannage Tannage au chrome Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A pre-tanning agent (OXD) which contains carboxyl, hydroxyl and tetra-amino groups was synthesized and applied in high exhaustion chrome tannage. This pre-tanning agent is able to react with the pendent amino groups of collagen and thus improves the hydrothermal stability when the additional carboxyl, hydroxyl and amino groups are introduced into the backbone of collagen. In the tanning process, the introduced carboxyl groups and the intrinsic carboxyl groups themselves of collagen coordinate with chromium and form uni- or multi-point bound chromium complexes, which seems to contribute to the final leather’s excellent chromium combination fastness and high chrome exhaustion. In a practical tannage, hide or skin pre-tanned with 2wt% OXD-I followed by a traditional chromium tannage, the absorption of chromium increased from 70.6% to 96.5%, and the content of Cr2O3 in the wastewater decreased from 1.76g/L to 0.16g/L. The shrinkage temperature of the leather also shifted from 104°C to 114°C. In a comparison with traditional chromium tannage, leathers pretreated with OXD followed by a chromium tannage showed good fullness and higher area yield as well as higher chromium combination fastness. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and instruments - Tannage - Interaction between OXD and collagen - Coordination between OXD and chromium - Determination of the chromium combination fastness in leather - Physical properties of leather - RESULTS AND DISCUSSION : Interaction between OXD-I and collagen - Co-ordination reaction between OXD-I and chromium - Effects of carboxyl groups of OXD on the exhaustion of chromium - Optimization techniques for OXD-I - Chromium combination fastness in leathers - Table 1 : Effects of carboxyl groups of OXD on absorption of chrome and shrinkage temperature of leather - Table 2 : Effect of OXD-I used as a pretannage and as a retannage on the exhaustion of chrome and leather performance - Table 3 : Effect of dosage of OXD-I pretannage on exhaustion of chrome and Ts of leather En ligne : https://drive.google.com/file/d/1Pkwv8zNmUM_M4uObdG0xZ4XdcXtI3Yci/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39020 [article]

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