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Thermodynamics of leather dyeing : III. The preparation of chrome-tanned hide powders and their interaction with C.I. Acid Orange 7 / A. T. Atto in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 55, N° 3 (03/1971)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 55, N° 3 (03/1971) . - p. 84-103 Titre : Thermodynamics of leather dyeing : III. The preparation of chrome-tanned hide powders and their interaction with C.I. Acid Orange 7 Type de document : texte imprimé Auteurs : A. T. Atto, Auteur ; H. E. Nursten, Auteur Année de publication : 1971 Article en page(s) : p. 84-103 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants acides Cuirs et peaux -- Teinture Entropie (thermodynamique) Orange (couleur) Poudre de peaux Tannage au chrome Thermodynamique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A procedure has been developed for chrome-tanning hide powder and it has been used to prepare a range of chrome-tanned hide powders with increasing chrome contents. The interaction of these tanned hide powders with the pure dye acid of C.I. Acid Orange 7 has been studied thermo-dynamically. The saturation capacity of the tanned hide powder for the acid dye increases almost linearly with the amount of chromium present, a chrome oxide content of about 3 % leading to a saturation capacity about twice that of untanned hide powder. The saturation capacities can be sur¬prisingly large, rising to almost three molecules dye bound per chromium atom. Chrome-tanned hide powder has been found to have a lower affinity for the acid dye than untanned, which is connected with the much larger satura¬tion capacity and the consequently lower activity in the fibre produced by a given amount of dye on the hide powder. The affinity at 60°c is independent of minor differences in tannage, but decreases with increasing amounts of chromium. The affinity increases with temperature in the range 25-75°c, while the saturation capacity decreases. Ageing chrome-tanned hide powder does not affect the affinity, but decreases somewhat the saturation capacity. Dyeing chrome-tanned hide powder appears to be exothermic and the entropies of dyeing are positive, the process thus being thermodynamically similar to dyeing untanned hide powder. Note de contenu : - Preparation of a number of batches of chrome-tanned hide powder (A) C20 hide powder - (B) ATA hide powder, Batch 1 - (C) ATA Hide powder, Batch 2 - (D) ATA hide powder (relatively very low chrome content) batch 3a - (E) ATA hide powder (relatively High chrome content), Batch 3b - Analysis of the tanned hide powders - Purification and analysis of the dye used - Dyeing - Reversibility of dyeing - Table 1 : Analysis of the tanned hide powders - Table 2 : Experimental data and quantities calculated therefrom - Table 3 : Saturation capacities of some chrome-tanned hide powders for C.I. Acid Orange 7 - Table 4 : Affinity of C.I. Acid Orange 7 for some chrome-tanned hide powders - Table 5 : Variation of affinity of C.I. Acid Orange 7 for chrome-tanned hide powder with chrome content - Table 6 : Comparison of the activity of C.I. Acid Orange 7 in tanned and untanned hide powder - Table 7 : Heats and entropies of dyeing of some chrome-tanned hide powders with C.I. Acid Orange 7 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35668 [article]

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