| Titre : |
The reaction of vegetable tannin-aldehyde-collagen - A further understanding of vegetable tannin-aldehyde combination tannage |
| Type de document : |
texte imprimé |
| Auteurs : |
Zhongbing Lu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 173-178 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Calorimétrie
Cuirs et peaux de moutons
Mimosa et constituants
Oxazolidine
Poudre de peaux
Stabilité hydrothermale
Tannage combinéLe 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 organique
Tannage végétal
Température de retrait
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Using mimosa as a vegetable tanning agent and oxazolidine as an aldehydic tanning agent, the approaches of hydrothermal analysis, hydrogen bond and hydrophobic bond breaking as well as chemical modifications of collagen were employed to investigate the effects of hydrogen bonds, hydrophobic bonds and side amino groups of collagen on vegetable tanning, aldehyde tanning and vegetable-aldehyde combination tanning The results indicated that the aldehyde should still predominantly react with the side amino group of collagen even when added after vegetable tanning. However, the aldehyde could further react with the vegetable tannin and thus form a cross-linkage between collagen and the vegetable tannin if high-activity nucleophilic sites are present in the tannin molecules. As a result, the synergistic effect of the combination tanning on increasing the hydrothermal stability of collagen fibres was achieved and the combined stability of vegetable tannin and collagen was strengthened remarkably. This mechanism is appropriate for describing combination tanning with condensed tannins which contain nucleophilic sites. However, with hydrolysable tannins, no aldehydic cross-linkage between collagen and tannin could be observed.
In general, this research revealed that vegetable-aldehyde combination tanning has features which are different from those previously assumed. According to the mechanism suggested in this paper, all the phenomena relating to vegetable tannin -aldehyde-collagen interactions can be well understood. |
| Note de contenu : |
- EXPERIMENTAL METHODS :
- Materials
- Methods
- Vegetable tanning of hide powder
- Combination tanning of hide powder
- Aldehyde tanning of hide powder
- Hydrogen bond breaking
- Hydrophobic bond breaking
- Differential scanning calorimetry (DSC) studies
- Amino analysis
- RESULTS AND DISCUSSION
- Table 1 : The influence of urea solution on hydrothermal stability of collagen (oC)
- Table 2 : The influence of n-propanol solution on hydrothermal stability of collagen (oC)
- Table 3 : The content of typical amino acids in the hide powders before and after chemical modifications (number of amino acid / 1000 amino acids)
- Table 4 : Ts and Tp of hide powders tanned by different tannages (oC)
- Table 5 : The shrinkage temperature (Ts) of the sheepskin leathers tanned by combination tannage using 20% tannin extract and 4% oxazolidine
- Table 6 : The influence of sequence in combination tannage on shrinkage temperature |
| En ligne : |
https://drive.google.com/file/d/1hO3CzXXRcP8Uf_g31Ja9PijSfHmCzAJ-/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39707 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 5 (09-10/2003) . - p. 173-178
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The reaction of vegetable tannin-aldehyde-collagen - A further understanding of vegetable tannin-aldehyde combination tannage in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 5 (09-10/2003)
