| Titre : |
Preparation and characterisation of synthetic tannins based on phenol-dimethylolurea resin |
| Type de document : |
texte imprimé |
| Auteurs : |
K. Venkataboopathy, Auteur ; R. Prabhu, Auteur ; Suman Meenakshi, Auteur ; V. S. Sundara Rao, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 175-178 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse spectrale
Caractérisation
Chromatographie sur couches minces
Cuir
Evaluation
Phénol-diméthylolurée
Photostabilité
Syntans
Syntans -- Synthèse
Tanins -- analyse
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Phenolic syntans possessing methylene linkages between phenolic nuclei are susceptible to auto-oxidation producing coloured quinonoid compounds. In this respect, syntans having bridging groups like dimethylcarbamide. sulphomethyl, sulphone. sulphonamide and propylene are known to exhibit better resistance to auto-oxidation. In the present investigation, studies have been carried out to synthesise and characterise a syntan in which phenolic nuclei are linked together by a dimethyl carbamide group. Phenol was condensed with dimethylolurea and the resulting resin was subsequently sulphonated with concentrated sulphuric acid. Both phenol-dimethylolurea resin and its sulphonated product were characterised by chromatographic and spectral methods. The syntan was prepared by mutual neutralization of sulphonated and sulphomethylated phenol dimethylolurea resin to a desired pH. The syntan was subjected to chemical analysis and assessed for light fastness characteristics. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Preparation of phenol-dimethylolurea resin - Purification of resin - Determination of molecular weight - Sulphonation of the resin - Sulphométhylation of the resin - Determination of unsulphonated resin - Determination of unreacted sulphuric acid content in the sulphonated resin
- PREPARATION OF SYNTANS : Preparation of syntan I - Preparation of syntan II - Preparation of syntan III - Chromatographic analysis - Spectroscopic analysis - Measurement of light fastness of leathers - Analysis of syntan
- RESULTS AND DISCUSSION : Characterisation of phenol-dimethylolurea resin - Characterisation of sulphonated phenol-dimethlolurea resin - Characterisation of the syntan - Light fastness studies -
- Table 1 : Thin layer chromatographic analysis of phenol-dimethlolurea resin
- Table 2 : Analysis of synthetic tannin I
- Table 3 : Light fastness assessment of leathers by Grey Scale Method |
| En ligne : |
https://drive.google.com/file/d/1o8MN2j552DWUvfnmnBh-3-4RzazpVFKv/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40233 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 5 (09-10/2001) . - p. 175-178
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