| Titre : |
Synthesis and application of eco-friendly amino resins for retanning of leather under different conditions |
| Type de document : |
texte imprimé |
| Auteurs : |
Rashid Saleem, Auteur ; Ahmad Adnan, Auteur ; Fahim Ashraf Qureshi, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 8-15 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Copolymère mélamine-formaldéhyde
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de chèvres
EthanedialL'éthanedial ou glyoxal est un composé organique de formule brute C2H2O2 et de formule semi-développé O=CH-CH=O. Ce liquide de couleur jaune est le plus petit dialdéhyde existant. C'est aussi une forme tautomère de l'éthynediol (HO–C≡C–OH) .
Retannage
Sulfamate de sodium
Sulfonation
Syntans
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Synthetic tanning agents are indispensable for making any type of leather article. There is a challenge for syntans to be processed without formaldehyde to meet strict regulations in the leather goods and chemicals arena. ln the present study, formaldehyde-free melamine based retanning has been developed using glyoxal as a condensing agent and sodium sulfamate as a sulfonating agent. Sulfonated glyoxylated melamine-based resins were prepared using different mole ratios of melamine, sodium sulfamate and glyoxal.
The sodium sulfamate to melamine mole ratio (SS/M) was varied from 0.5 to 3.0 and glyoxal to melamine mole ratio (GIM) was varied from 2 to 6. Fluidity and gelling behaviour of resinous solutions were evaluated with the increasing trend of sulfonation and with increasing mole ratio of glyoxal to melamine.
Stabilized resins were applied comparatively as retanning agents on chrome-tanned goatskins against a conventional formaldehyde based melamine resin. Comparative tear strengths, tensile strengths, elongation at break and scanning electron micrographs of glyoxylated melamine and formaldehyde-based melamine-retanned leathers were studied and better performance was found in glyoxylated melamine-tanned leathers. The resin with optimum performance was structurally elucidated by FTIR. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Preparation of sulfonated melamine glyoxylated resin
- RESULTS AND DISCUSSION : Schematic route - Rheology resins - Application of resins as tanning agent - Quantitative free formaldehyde analysis in leather - Mechanical characteristics of retanned leather - Organoleptic properties - SEM Examination (JEOL 6490) - Structural elucidation |
| En ligne : |
https://drive.google.com/file/d/16uBp_X7uveqCR_UT06oA5yfieEZmxp1y/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23228 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 8-15
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