[article]
| Titre : |
Novel titanium (IV) tanning for leathers with superior hydrothermal stability : II. The influence of organic ligands on stability and tanning power of titanium sulfate solutions |
| Type de document : |
texte imprimé |
| Auteurs : |
Biyu Peng, Auteur ; Dennis C. Shelly, Auteur ; Haojun Fan, Auteur ; Keyi Ding, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2007 |
| Article en page(s) : |
p. 261-270 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
A key objective for improving titanium tanning power is increasing titanium solution stability and adjusting both the states and behaviors of the Ti(IV) species in aqueous solution so that titanium tanning can be carried out at a suitable (high) pH. The influence of 35 organic ligands, including mono and multiple carboxylates, amino-ligands and hydroxyl-carboxylates, on the stability and tanning power of titanium sulfate liquors were investigated. Results show that only some hydroxylcarboxylates, such as lactate, tartrate, citrate, sulfosalicylate etc., can effectively improve titanium sulfate solution stability. Only these ligands form stable chelate-type coordination compounds with Ti4+, as shown by potentiometic titration, FTIR spectroscopy and elemental analysis of the coordination complexes. Among these hydroxylcarboxylates, the lactate-masked titanium sulfate system at 0.40-0.5:1 mole ratio of lactate to Ti4+ has the best tanning power. Lactate has a relatively small molecular volume as well as a moderately high formation constant with Ti4+. Leather tanned by a lactate-masked titanium sulfate liquor had the highest titanium content, the best titanium distribution uniformity, a shrinkage temperature, Ts, of 97oC with pleasing softness. |
| En ligne : |
https://drive.google.com/file/d/1-5vllioomW0H33vW-w9rb7HI-EJHNB2U/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3342 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 261-270
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Novel titanium (IV) tanning for leathers with superior hydrothermal stability in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)
