Synthesis of aniline 2,5 disulfonic acid modified ecofriendly melamine resins and their performance evaluation as leather retanning agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 5 (09-10/2020) . - p. 216-226 Titre : Synthesis of aniline 2,5 disulfonic acid modified ecofriendly melamine resins and their performance evaluation as leather retanning agents Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Nafisa Gull, Auteur ; Shahid Khan, Auteur ; Rashid Saleem, Auteur ; Rafi Ullah Khan, Auteur Année de publication : 2020 Article en page(s) : p. 216-226 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Eaux usées -- Analyse Formaldéhyde -- Suppression ou remplacement Mélamine -- Synthèse Microscopie électronique à balayage Poids moléculaires Retannage Rhéologie Stabilité thermique Thermogravimétrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins used in the leather retanning process are condensation products of formaldehyde which makes such resins objectionable due to environmental hazards. Due to the carcinogenic effects of formaldehyde, there is a growing demand to produce formaldehyde-free leather. This work involves the synthesis of formaldehyde free melamine resins for producing environment friendly leather with improved retanning properties and thermal stability. A series of resins was produced by condensation of glyoxal and melamine at varied mole ratios. Stability and water solubility was achieved by sulfonation with aniline 2,5 disulfonic acid at varied degrees of sulfonation. Resins were evaluated to measure the viscosity trends in series. Synthesised resins were studied for their comparative retanning properties in comparison with a commercial melamine resin as control. Mechanical properties like tensile strengths tear strengths, and elongation at break were measured and found to be improved. Similarly, the organoleptic properties were also evaluated and found to be better than for the control. Retanned pieces of leather were examined by SEM and tested for free formaldehyde content. The optimal resin was subjected to analysis by FTIR, TGA and molecular weight determination. Effluents collected from retanning baths were tested for pollution load efficiency. The results of the study confirmed that the prepared resins were supportive in producing formaldehyde-free leather with improved mechanical and organoleptic properties. The thermal stability of the resulting resins and pollution load efficiency was also found to be improved. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Preparation of aniline 2,5 disulfonic acid modified melamine glyoxal resins - RESULTS AND DISCUSSION : Schematic route - Rheology of resins - Leather application of MGADS resins as retanning agent - Mechanical properties of leather treated with MGADS resins - Organoleptic properties - SEM analysis of retanned pieces of leather - Quantitative estimation of free formaldehyde contents in leather - Thermogravimetric analysis - Structural elucidation - Molecular weight determination of optimal MGADS resin - Analysis of effluent En ligne : https://drive.google.com/file/d/1QEiBifPuL-H5we65DiaVyKq52J6mp4uk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34522 [article]

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