Synthesis, characterisation and application of environment friendly polymers for producing sustainable leather / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 1 (01-02/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 1 (01-02/2021) . - p. 19-30 Titre : Synthesis, characterisation and application of environment friendly polymers for producing sustainable leather Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shazad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur Année de publication : 2021 Article en page(s) : p. 19-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biopolymères -- Synthèse Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Eaux usées -- Analyse Formaldéhyde -- Suppression ou remplacement Mélamine-Méthylglyoxal Poids moléculaires Retannage Rhéologie Stabilité thermique Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of formaldehyde-free melamine-methylglyoxal resins has been produced at various mole ratios of reactants. The methylglyoxal to melamine mole ratio (MG/M) was varied from 3 to 6 and the sodium metabisulfite to melamine mole ratio (SMB/M) was varied from 0.05 to 0.2. Viscosity trend of resins within the series was examined. The prepared resins were used as retanning agents and their improved mechanical and organoleptic properties were noticed in comparison with a commercial melamine-formaldehyde resin. The morphology of grain surface and fibre structure of the leathers was investigated by scanning electron microscopy (SEM). Thermal stability of the optimal resin was assessed and observed to show an improvement over the commercial melamine-formaldehyde resin. Molecular weight and FTIR study of optimal resin was also pursued. Determination of free formaldehyde confirmed that the resulting leather was free from formaldehyde. A pollution load study of retanning effluent showed a significant reduction in chemical oxygen demand, total suspended solids and total dissolved solids for the optimal resin reflecting its improved exhaustion due to optimised molecular size and ability to undergo in situ polymerisation in collagen fibres. The results have shown that the melamine resins of this novel work are suitable for producing formaldehyde-free leather with improved retanning properties and reduced pollution load of the wastewater. Methylglyoxal has been proved as a successful alternate of formaldehyde in resin synthesis to control air emissions and carcinogenic effects while producing sustainable leather. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of novel melamine resins using methylglyoxal as a condensing agent - RESULTS AND DISCUSSION : Schematic route of synthesis - Rheology of resins - Evaluation of retanning performance of SMMG resins - Mechanical proerties of leather treated with SMMG resins - Organoleptic properties of the leather treated with novel SMMG resins - Quantitative estimation of free formaldehyde content in treated leather - Molecular weight determination of optimal SMMG resin - Structural elucidation of optimal SMMG resin - Comparative thermo gravimetric analysis of optimal SMMG resin - Analysis of effluent - Table 1 : Mole ratio and physical characteristics of novel SMMG resins - Experimental data - Table 2 : Leather processing materials, conditions and recipe - Table 3 : Mechanical properties of leather treated with sulfonated melamine-methylglyoxal resins - Table 4 : Dependence of flow time, relative viscosity, specific viscosity - Table 5 : Comparative characteristics of effluent after retanning with novel SMMG#06 resin and control resin - Scheme 1 : Reaction of melamine and methylglyoxal at different mole ratio - Scheme 2 : Sulfonation of melamine-methylglyoxal derivative - Scheme 3 : Condensation of sulfonated tetrahydroxy melamine to form polymer molecule En ligne : https://drive.google.com/file/d/14IGqeHhbQcRyM88CW02qqG0GNzcv3Cr6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35314 [article]

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