| Titre : |
Thermodynamics of leather dyeing : IV. Dyeing of chrome-tanned hide powder with simple acid dyes |
| Type de document : |
texte imprimé |
| Auteurs : |
A. T. Atto, Auteur ; H. E. Nursten, Auteur |
| Année de publication : |
1971 |
| Article en page(s) : |
p. 163-174 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Colorants acides
Cuirs et peaux -- Teinture
Entropie (thermodynamique)
Poudre de peaux
Tannage au chrome
Titrage thermométrique
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The previous study of the interaction between chrome-tanned hide powder and C.I. Acid Orange 7 has been extended to seven other simple acid dyes in the form of their specially purified dye acids. Good reciprocal plots were obtained at 45 and 60°c, leading to saturation capacities greater than 2 meq/g dry hide substance, except for the dye acids bearing sulphonic groups peri to the azo link. The affinities obtained are lower than those for untanned hide powder and this must be viewed as a consequence of the much greater saturation capacity, which leads to the production of a lower activity in the fibre by a given amount of dye. The affinity of a dye acid for chrome-tanned hide powder increases with the insertion of a methyl group or a fused-on benzene ring, but movement of a sulphonic group to a position peri to the azo link reduces it. Overall, the standard heats and entropies of dyeing chrome-tanned hide powder are of the same sign and order of magnitude as those for the untanned substrate. The thermodynamics of dyeing chrome-tanned hide powder thus do not appear to differ fundamentally from those of dyeing untanned hide powder. |
| Note de contenu : |
- EXPERIMENTAL : The dyes - Substrates - Dyeing
- RESULTS AND DISCUSSION : The reciprocal plot - Titration curves - Saturation capacities - Affinities - Heats of dyeing - Entropies of dyeing
- Table 1 : Experimental data and quantities calculated therefrom
- Table 2 : Saturation capacities, affinities and ratio dye acid/Cr atom of chrome-tanned ATA 1114e powder for a range of simple dye acids
- Table 3 : Affinities of some simple dye acids for untanned and tanned hide powder kcal/mole
- Table 4 : Heats and entropies of dyeing chrome-tanned hide powder with some simple dye acids at 45-60 °C |
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in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 55, N° 5 (05/1971) . - p. 163-174
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Thermometric titrations / New York [Etats-Unis] : John Wiley & Sons (1975)
