[article]
| Titre : |
Preparation and application of metanilic acid modified ecological melamine resins for making formaldehyde-free leather |
| Type de document : |
texte imprimé |
| Auteurs : |
Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 126-136 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Formaldéhyde -- Suppression ou remplacement
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.
Retannage
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The objective of this study is to develop a novel melamine based resin suitable for producing formaldehyde-free leather with improved retanning properties. A series of resins was prepared by condensation of melamine, glyoxal and metanilic acid at varied mole ratios of reactants. Prepared resins were evaluated for retanning performance in leather in comparison with a commercial melamine resin to select the optimal resin. The mechanical and organoleptic properties of the optimal resin were found to be better than those of the commercial melamine resin. Tensile strength, tear strength and elongation of leather were increased by 17.43 %, 10.41 % and 8.62 % in direction parai lel to backbone while the increase in these parameters was 15.17 %, 9.79 % and 6.0% respectively in direction perpendicular to the backbone at same dosages. 100% reduction of free formaldehyde content was apparent in retanned leather and in the effluent produced by novel melamine resin. Pollution load study of the effluent showed a reduction in chemical oxygen demand, total suspended solids and total dissolved solids by 9.21 %, 5.60 % and 6.97 % for the novel melamine resin reflecting its improved exhaustion. The fibre structure of the leather produced using the optimal melamine resin was arranged in a more orderly pattern as confirmed by scanning electron microscopy, thus showing its improved retanning capability. These results prove that the optimal melamine resin is an effective retanning agent suitable for producing formaldehyde-free leather with a reduction in effluent pollution load. This work also presents an alternative for formaldehyde for amino resins to address its carcinogenic effects. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of metanilic acid modified melamine-glyoxal resins
- RESULTS AND DISCUSSION : Schematic route - Leather application of resins as retanning agent - Mechanical characteristics of retanned leather - Effect of melamine resins on organoleptic properties - SEM analysis - Quantitative determination of ree formaldehyde contents in leather - Thermogravimetric analysis (TGA) - FTIR analysis - Effluent analysis
- Table 1 : Mole ratio and physical characteristics of synthesised MGMNA resins
- Table 2 : Leather processing recipe conditions
- Table 3 : Mechanical characteristics of leather retanned with novel MGMNA resins and commercial resin
- Table 4 : Comparative characteristics of effluent for leathers retanned with novel resin MGMNA#09 and commercial melamine resin |
| En ligne : |
https://drive.google.com/file/d/1VlBcJdgglhf3cE0A5J6OugVIVuK_otgv/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37757 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 126-136
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Preparation and application of metanilic acid modified ecological melamine resins for making formaldehyde-free leather in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)
