[article]
| Titre : |
Studies on the development of leathers from formaldehyde-free melamine syntan |
| Type de document : |
texte imprimé |
| Auteurs : |
Swarna Vinodh Kanth, Auteur ; Gladstone Christopher Jayakumar, Auteur ; S. C. Ramkumar, Auteur ; B. Chandrasekaran, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 142-148 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuirs et peaux
Formaldéhyde
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Produits de condensation (chimie)
Syntans
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Syntans are indispensable for the manufacture of any kind of leather. Most of the retanning, replacement and filling syntans available today in the market are products made by condensation polymerization reaction using formaldehyde as a condensing agent. Formaldehyde is involved in condensation reaction with substrates such as phenol, naphthalene, melamine, dicyandiamide etc. The resulting products, most of the time, contain and contribute to more than acceptable limits of free formaldehyde in leather. Therefore, there is a growing need for syntans without formaldehyde to meet the stringent regulations on the use and presence of formaldehyde in leather and leather chemicals. Several international regulations call for products that are free of formaldehyde. Even though reducing formaldehyde in leather and leather chemicals is practiced, complete replacement of formaldehyde in condensation process is not well known. In the present study, syntans developed without the use of formaldehyde as a condensing agent for the manufacture of melamine syntan is presented. The physico-chemical analysis, morphological studies and emission loads of the formaldehyde-free melamine syntan have been compared with conventional melamine formaldehyde syntan. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Preparation of formaldehyde-free melamine syntan- Characterization of the prepared formaldehyde-free melamine syntan determination of solid content - Determination of particle size of the prepared syntan - Evaluation of the prepared syntan - Physico-chemical evaluation of the leather - Assessment of softness through digital leather softness tester - Colour measurement - Fastness to artificial light - Fastness to dry and web rub - Organoleptic properties - Scanning electron microscopy analysis of processed leathers - Analysis of post-tanning wastewaters
- RESULTS AND DISCUSSION : Particle size analysis of the products - Organoleptic properties - Physical characteristics of leathers - Color difference studies - Spent post-tanning liquor analysis - Scanning electron microscopic analysis - Free formaldehyde in leather |
| En ligne : |
https://drive.google.com/file/d/1_prsgPnJzjFgyxa4QNiZHb00_sdnD6nm/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14993 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 5 (05/2012) . - p. 142-148
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Studies on the development of leathers from formaldehyde-free melamine syntan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 5 (05/2012)
