Synthesis and application of eco-friendly amino resins for retanning of leather under different conditions / Rashid Saleem in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 8-15 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 Ethanedial L'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 [article]

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Synthesis, characterization and application of sulphite castor maleic adduct as an effective leather fatliquor / Muhammad Imran-Ul Haq in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 5 (09-10/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 5 (09-10/2016) . - p. 263-270 Titre : Synthesis, characterization and application of sulphite castor maleic adduct as an effective leather fatliquor Type de document : texte imprimé Auteurs : Muhammad Imran-Ul Haq, Auteur ; Ayoub Rasheed, Auteur ; Ahmad Adnan, Auteur ; Fahim Ashraf Qureshi, Auteur ; Rashid Saleem, Auteur Année de publication : 2016 Article en page(s) : p. 263-270 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride maléique Composés organiques -- Synthèse Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Douceur (toucher) Huile de ricin et constituants Huiles et graisses Métabisulfite de sodium Le métabisulfite de sodium ou pyrosulfite de sodium est un désinfectant, antioxydant et conservateur alimentaire jaunâtre. Photostabilité Produits de nourriture du cuir Solubilité Viscosité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquors are involved in leather making process to separate fibres of leather from each other and impart soft hand feeling. Fatliquors are chemically modifications of vegetable and animal oils. Castor oil is suitable as a basic raw material for the preparation of fatliquor due to hydroxyl functionality on ricinoleic acid. In this paper, castor ail based synthetic fatliquors were synthesised by two step processes. In a first step castor oil is condensed with maleic anhydride at varying mole ratio from 1 to 3. In the second step castor maleic adduct was sulphited with sodium metabisulphite at varying mole ratios from zero to 1.5. Solubility behaviour with viscosity changes were observed at différent mole ratios of reactants. Structural changes in synthetic fatliquors were studied by FTIR spectroscopy. Fatliquoring properties at the stabilised fatliquors were comparatively evaluated on goat crust leather. Comparative analysis at leather softness, lear and tensile strengths, elongation at break, light fastness and scanning electron microscopy (SEM) of the fatliquored feathers were studied and comparatively better results were found in leather using the synthetic fatliquor which was synthesised at optimal conditions of castor ail to maleic anhydride mole ratio of 1:1.5 and further sulphitation of the castor maleic adduct with sodium metabisulphite at a mole ratio of 1. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemicals - Apparatus - Preparation of sulphited castor maleic condensate based synthetic fatliquor - RESULTS AND DISCUSSIONS : Schematic approach for synthetic fatliquor - Solubility and viscosity behavior - Fatliquor application - Organoleptic properties - Scanning electron microscopy - Structure elucidation En ligne : https://drive.google.com/file/d/1Gdqv54OnVR3LcJIsVxL245nq0s-ZLlrc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27092 [article]

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Viscosity and retanning properties of isophthalic dihydrazide based amino resins under different reactant conditions / Rashid Saleem in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 5 (09-10/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 5 (09-10/2013) . - p. 211-219 Titre : Viscosity and retanning properties of isophthalic dihydrazide based amino resins under different reactant conditions Type de document : texte imprimé Auteurs : Rashid Saleem, Auteur ; Ahmad Adnan, Auteur ; Muhammad Riaz, Auteur ; Fahim Ashraf Qureshi, Auteur Année de publication : 2013 Article en page(s) : p. 211-219 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture Chimie -- Essais et réactifs Cuirs et peaux -- Propriétés mécaniques Déchirure (mécanique) Dihydrazide isophthalique Formaldéhyde Fourier, Spectroscopie infrarouge à transformée de Mélamine La 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. Métabisulfite de sodium Le métabisulfite de sodium ou pyrosulfite de sodium est un désinfectant, antioxydant et conservateur alimentaire jaunâtre. Microscopie électronique à balayage Retannage Stabilité thermique Sulfoniques, Acides Thermogravimétrie Traction (mécanique) Viscosité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sulfonated amino resins like urea and melamine formaldehyde resins are widely used in retanning of leather. Both urea and melamine formaldehyde resins show free formaldehyde contents in the retanned leather greater than permissible limits Oppm). In this research sulfonated isophthalic dihydrazide formaldehyde condensates have been prepared through controlled reaction of isophthalic dihydrazide with formaldehyde and sodium metabisulfite under different reactant conditions to optimize the free formaldehyde content in retanned leather within permissible limits. The retanning behaviours of these resin have been investigated. Tear strength, tensile strength, elongation at break and morphology of grain and cross section of fibre through scanning electron microscopy of the retanned leather has been studied. TGA was performed to evaluate the thermal stability of the resin. Structural elucidation of the optimized resin was characterized by FTIR. Note de contenu : - MATERIALS AND METHODS : Chemicals - Apparatus - Preparation of sulfonated glutaric dihydrazide formaldehyde resin - Resin application as retanning agent - RESULTS AND DISCUSSION : Methylolation - Sulfonation - Condensation of monomers - Viscosity behavior - Physico-chemical evaluation of the leather - Free formaldehyde analysis in leather - Organoleptic properties - Scanning electron microscopic analysis of processed leathers - Thermogravimetric analysis - Structural ellucidation by FTIR En ligne : https://drive.google.com/file/d/16q6HIFbK2M9up2m2okOFTPIT1GoqQbRN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19570 [article]

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