Combination tannage of tannic acid and rare earth / Shan Zhihua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 2 (03-04/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 2 (03-04/2004) . - p. 72-75 Titre : Combination tannage of tannic acid and rare earth Type de document : texte imprimé Auteurs : Shan Zhihua, Auteur ; Wang guowei, Auteur Année de publication : 2004 Article en page(s) : p. 72-75 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Poudre de peaux Tanins végétaux Tannage combiné Le 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 minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage végétal Terres rares Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The mechanism of the combination tannage of a rare earth (Ce) bound with tannic acid is described in the paper. Based on the potentiometric titration in aqueous solution of Ce, Gallic acid (Ga) and Glycyl Glycine (GG), we found that that the formation constant of the complex CeGa increased with increasing temp, from 9°C to 30°C, lgkCeGa rose from 11.55 to 11.92, while the formation constant of complex CeGG decreased with increasing temperature, from 6.35 to 3.08. Complex CeGa and mixed ligand complexes CeGaGG in the solid state display a stronger resistance to thermal decomposition than uncombined CeCl3, Ga and GG. When reacting Ce(III) and tannic acid with hide powder or modified hide powder either together or separately, it was found that Ce coordinated on tannins, while tannic acid combined with collagen, and this manner of combination played a important role in the combination tannage. Based on these studies, the paper proposed the concept “Poly--Strut Firm Structure” to explain the synergistic effect in rare earth-vegetable tannins combination tannage. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and instruments - Stability of rare earth complexes - RE action with hide powder or modified hide powder - RE+T action with hide powder or modified hide powder - RE+T action with other groups of protein - RESULTS : The stability of RE complexes - RE action on hide powders or modified hide powders - RE and T action on hide powders or modified hide powders - RE+T action on substitutes - DISCUSSIONS : Ts as the judgment of tanning effect - The concept of tanning power of tanning agents - Poly-strut firm structure deduction - Table 1 : Formation constants of CEGa, CeGG, CeGaGG at different temperatures - Table 2 : Weight loss values of CeGa, CeGG, CeGaGG (Rate : 20°C./min, at 300°C) - Table 3 : Reaction of RE with hide powders (based on hide powder weight) - Table 4 : RE+T action on hide powder sor modified hide powders - Table 5 : RE bonded with substitutes (based on substitutes weight En ligne : https://drive.google.com/file/d/1da0QhJ0FNoXVBxQHcxkOILrjfQji9zzW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39645 [article]

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