Influence of a synthesized condensed polymer as a pre and retanning agent on the properties of buffalo leather / El-Shahat H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 2 (03-04/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 2 (03-04/2003) . - p. 62-68 Titre : Influence of a synthesized condensed polymer as a pre and retanning agent on the properties of buffalo leather Type de document : texte imprimé Auteurs : El-Shahat H. A. Nashy, Auteur Année de publication : 2003 Article en page(s) : p. 62-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de buffles Polymères -- Synthèse Prétannage Retannage Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Asynthetic sulphited polymer based on a urea - paraformaldehyde condensate has been prepared to be used as pre and retanning agent. The influence of the prepared polymer on buffalo leather was investigated and compared with the most commonly applied products, chrome tan with vegetable extract retannage. The properties of the treated leather, namely tensile strength, elongation at break, tear strength, deformability, scanning electron microscope examination, thermal stability and appearance were studied. These parameters were used to evaluate the polymer’s applicability as an efficient environment friendly tanning agent. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : - A - Polymer synthesis - B - Characterization of the treated leather - Table 1 : Strength properties - Effect of different tanning agents and procedures - Table 2 : TGA for buffalo tanned leather by Chrome process and polymer with chrome - Table 3 : Visual and handle evaluation of buffalo tanned leather - Table 4 : Physico-chemical valuation of the leather produced by the two processes En ligne : https://drive.google.com/file/d/1GKgRW7UGr6a4cGSzGjTMZLHdip6fmWIe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39801 [article]

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Studies on water dispersible products based on sulphitation of wool wax by trichlorosilyl sulphite agent / El-Shahat H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 212-218 Titre : Studies on water dispersible products based on sulphitation of wool wax by trichlorosilyl sulphite agent Type de document : texte imprimé Auteurs : El-Shahat H. A. Nashy, Auteur ; N. H. El-Sayed, Auteur ; S. S. Elmorsy, Auteur Année de publication : 2002 Article en page(s) : p. 212-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composition chimique Huiles et graisses synthétiques Lanoline Sulfitation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wool wax is an industrial by-product which has been investigated for further use in the leather industry. It was treated with trichlorosilyl sulphite (TCSS) as a new reagent to obtain an oil having sulphite groups. Trichlorosilyl sulphite (TCSS) can be generated in situ by the interaction of tetrachlorosilane with sodium sulphite or sodium bisulphite. This forms a basic raw material stock for the development of a range of synthetic fatliquors which can be used in the leather industry equivalent to those based on sulphochlorinated oils. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Scanning Electron Microscopy - RESULTS AND DISCUSSION : A) - Wool wax acids - B) - USM Composition - 3) - FT-IR - Visual properties of fatliquored leather - Visual properties of fatliquored leather - Scanning Electron Microscopy (SEM) - Table 1 : The physical and chemical characteristics of El-Bieda wool wax. - Table 2 : Composition of wool wax fatty acids - Table 3 : Composition of wool wax USM - Table 4 : Sulphitation of wool wax under different conditions - Table 5 : Visual properties of fatliquored leather En ligne : https://drive.google.com/file/d/1UJnqRYet2KTiIFwP-tsp67_sdpHjdYa-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39861 [article]

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Synthesis and application of urea paraformaldehyde polymer as a tanning agent / N. H. El-Sayed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 6 (11-12/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 6 (11-12/2002) . - p. 240-248 Titre : Synthesis and application of urea paraformaldehyde polymer as a tanning agent Type de document : texte imprimé Auteurs : N. H. El-Sayed, Auteur ; El-Shahat H. A. Nashy, Auteur Année de publication : 2002 Article en page(s) : p. 240-248 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Analyse sensorielle Copolymère urée formaldéhyde Copolymères -- Synthèse Cuirs et peaux -- Propriétés mécaniques Essais de résilience Essais dynamiques Evaluation visuelle Résistance à la putréfaction Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A urea paraformaldehyde polymer has been synthesized under optimum conditions, for use as a tanning agent. The characteristics and effects of this polymer as a tanning agent were investigated. The tensile strength, elongation at break, tear strength, scanning electron microscopy (SEM), shrinkage temperature, shrinkage area, putrefaction resistance and thermal gravimetric analysis (TGA) parameters were studied. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Methods - RESULTS AND DISCUSSION : Polymer synthesis - Scheme 1 : Polymer formula - Scheme 2 : Sulphited polymeric structure - 2- Mechanical Properties - 3- Scanning Electron Microscopy (SEM) - 4- Shrinkage Temperature (ST) - 5- Putrefaction resistance - 6- Thermo Gravimetric Analysis (TGA) of the treated leather - 7- Handle and appearance (Table VI) - 8- Practical Application - Scheme 3 : Application process - Table 1 : Effect of polymer percentages on mechanical properties - Table 2 : Dependence of shrinkage temperature and area on percentage of polymer used - Table 3 : Total soluble proteins of the treated leather after putrefaction - Table 4 : Free amino acids of the treated leather after putrefaction - Table 5 : TGA for raw and tanned leather by chrome and the prepared polymer - Table 6 : Visual evaluation of polymer tanned leather En ligne : https://drive.google.com/file/d/1ze4J_adSjd0DsMbNmgvAeQVkFmancavl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39844 [article]

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Valorization of sustainable vegetable oil deodorizer distillate as a novel fatliquor / El-Shahat H. A. Nashy in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 13 p. Titre : Valorization of sustainable vegetable oil deodorizer distillate as a novel fatliquor Type de document : texte imprimé Auteurs : El-Shahat H. A. Nashy, Auteur ; Adel Gabr Abdel-Razek, Auteur ; Minar Mahmoud M. Hassanein, Auteur ; Ghada A. Abo-Elwafa, Auteur ; Hamed Elsayed, Auteur Année de publication : 2023 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Biomolécules actives Caractérisation Cuirs et peaux -- Propriétés mécaniques Désodorisation Dureté (matériaux) Phosphorylation La phosphorylation est l'addition d'un groupe phosphate (un phosphoryl PO32- plus précisément) qui est transféré à une protéine ou à une petite molécule, telle le glucose ou l'adénine. Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The deodorizer distillate (DD) is a byproduct of vegetable oil processing industry and is rich in functional bioactive components. This study aimed to employ phosphorylation modification for DD to produce a new sustainable fatliquor. The bioactive ingredients in DD, namely fatty acids, sterols, and tocopherols, were determined by using HPLC and GLC. The results revealed that the DD sample contained a high percentage of unsaturated fatty acids (72.3%) and high levels of γ and δ-tocopherols (54.8% and 31.60%, respectively). Mechanical parameters (tensile strength, elongation at break, and tear strength) of leather were improved after being treated with the prepared fatliquor emulsion. Eventually, SEM showed that the texture of the fatliquored leather had been remarkably enhanced. Moreover, the fatliquored leather possessed effective antibacterial effect against the specified +ve, −ve bacteria, and Candida albicans microorganisms. The strength, fullness, soft handle, and elasticity of leather were all improved, and the grain of leather was protected from becoming loose after drying. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of DD for chromatographic analysis - Determination of bioactive components - Phosphorylation processes - Characterization of the PDD sample - Fatliquoring process - Characterization of the fatliquored leather - RESULTS AND DISCUSSION : Characterization of DD - Characterization of the PDD sample - Characterization of the fatliquored leather - Table 1 : FA composition of DD sample - Table 2 : HPLC analysis of TAG molecular species of DD sample - Table 3 : Mechanical properties and hardness of fatliquored leather DOI : https://doi.org/10.1186/s42825-023-00124-8 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00124-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40067 [article]

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