Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate / Samya El-Sherbiny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1379-1390 Titre : Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate Type de document : texte imprimé Auteurs : Samya El-Sherbiny, Auteur ; Nivin M. Ahmed, Auteur Année de publication : 2018 Article en page(s) : p. 1379-1390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Kaolin Molybdate d'ammonium Papier -- Propriétés mécaniques Papier et carton couché Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Mechanical properties of paper coating layers are very important in converting and printing operations. Kaolin is commonly used in paper coating as cheap pigment in addition to its superior properties. In this study, a new approach for improving coated paper mechanical properties using doped kaolin with ammonium molybdate was presented. Kaolin and modified kaolin were characterized using several analyses tools (e.g., XRD, SEM, and EDX), and then they were applied in paper coating mixture. The results revealed that the dopant was found in the kaolin as MoOx; this oxide form with its needle shapes led to change in the kaolin crystals, and its presence in high concentrations led to exfoliation of kaolin. Also, at high concentration it was found that MoOx reacted with γ-alumina that is found in kaolin after its heating at 300°C to form aluminum molybdate. It can be observed that modified kaolin increased the coated paper porosity and consequently the opacity; also bulk and thickness were increased. Significant improvement in coated paper tensile strength, bursting strength, tensile energy absorption, and bending stiffness was also noticed. Thermal study also showed that increasing the concentration of ammonium molybdate increased the heat stability of the coated paper. Note de contenu : - EXPERIMENTAL : Materials - Chemical treatment of kaolin - Preparation of coating mixture - Preparation of coated paper samples - Characterization fo the treated kaolin and coated paper samples - RESULTS AND DISCUSSION : Characterization of unmodified kaolin and modified kaolin - Coated paper properties - Thermal analysis of coated paper DOI : 10.1007/s11998-016-9903-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9903-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31355 [article]

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A method for preparation and application of micronized ferrite pigments in anticorrosive solvent-based paints / Mahmoud A. Abd El-Ghaffar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 6 (11/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 6 (11/2010) . - p. 703-713 Titre : A method for preparation and application of micronized ferrite pigments in anticorrosive solvent-based paints Type de document : texte imprimé Auteurs : Mahmoud A. Abd El-Ghaffar, Auteur ; Nivin M. Ahmed, Auteur ; Elham A. Youssef, Auteur Année de publication : 2010 Article en page(s) : p. 703-713 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier -- Laminage Anticorrosion Ferrites (matériaux magnétiques) Pigments inorganiques Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : This work presents a method of preparing single-, double-, and triple-cation ferrite pigments by employing simple chemical techniques to study their corrosion protection properties. The prepared pigments were characterized using X-ray diffraction and scanning electron microscopy. All prepared ferrite pigments were evaluated using ASTM methods. Anticorrosive paint formulations were performed using different prepared pigment loadings. The physico-mechanical and corrosion properties of dry paint films were examined. The tests revealed that the prepared ferrite pigments show excellent anticorrosive behavior, and that the best among them in performance are zinc and zinc magnesium. Calcium, zinc–calcium, and zinc–magnesium–calcium ferrites show better performance in high pigment loadings, while magnesium ferrite pigments show good results only in low pigment loading. DOI : 10.1007/s11998-009-9229-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9229-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10397 [article]

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A novel approach for new cost-saving durable anticorrosive and antibacterial coatings / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1263-1281 Titre : A novel approach for new cost-saving durable anticorrosive and antibacterial coatings Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Nivin M. Ahmed, Auteur ; Wael S. Mohamed, Auteur ; Eglal R. Souaya, Auteur Année de publication : 2019 Article en page(s) : p. 1263-1281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de vinyle L'acétate de vinyle est l'ester de l'acide acétique (acide éthanoïque) avec le tautomère alcoolique de l'éthanal (acétaldéhyde) et de formule semi-développée, CH3COO–CH=CH2. L'acétate de vinyle est préparé, en règle générale, en phase vapeur, en faisant réagir un grand excès d'acétylène sur de l'acide acétique (200 °C) en présence de catalyseurs au zinc et au cadmium). On obtient un liquide incolore à odeur très pénétrante qui ne se polymérise en polyacétate de vinyle (PVAC) qu'en présence de catalyseurs et donne des solides durs très stables à la chaleur. Il peut être copolymérisé avec d'autres composés vinyliques ou d'autres monomères. Antibactériens Anticorrosifs Anticorrosion Copolymérisation Essais accélérés (technologie) Evaluation Matériaux -- Propriétés fonctionnelles Matériaux hybrides Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : Multifunctional coatings that perform various actions simultaneously are now of prevailing importance, with zeolites being one of the most useful materials in this field. In this work, Na-P-zeolite was prepared from kaolin and subjected to a cation-exchange process to replace Na+ by Cu2+ and/or Zn2+ to achieve anticorrosive and antibacterial effects. In situ emulsion polymerization of vinyl acetate-vinyl versatate (VAc-VEOVA) copolymer at the nanoscale with P-zeolite and Zn-, Cu-, Zn/Cu-cation-exchanged P-zeolites was then applied to obtain P-zeolite-(VAc-VEOVA), Zn-P-zeolite-(VAc-VEOVA), Cu-P-zeolite-(VAc-VEOVA), and Zn/Cu-P-zeolite-(VAc-VEOVA) nanocomposites. Anticorrosive and antibacterial tests were then carried out on films containing the different nanocomposites using laboratory accelerated testing, electrochemical impedance spectroscopy (EIS), and the disc well diffusion method with different types of Gram-positive (G+) and Gram-negative (G−) bacteria, revealing that the film containing the mixed (Zn/Cu)-P-zeolite showed the best anticorrosive and antibacterial performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of P-zeolite - Prepration of cation-exchanged P-zeolites - Preparation of (VAc-VEOVA) copolymer nanocomposites by in situ emulsion polymerization - Paint preparation - Preparatin of steel panels for anticorrosion testing - Preparation of specimens for antibacterial testing - METHODS OF TESTING AND EVALUATION OF PAINTS : Anticorrosion measurements - RESULTS AND DISCUSSION : Characterization of P-zeolite and cation-exchanged P-zeolites - Characterization of the prepared nanocomposites - Anticorrosion performance of paints containing P-zeolite and cation-exchanged P-zeolites - Antibacterial results for cation-exchanged P-zeolites and their paint formulations DOI : 10.1007/s11998-019-00202-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00202-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33010 [article]

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