Novel retanning agents for chrome tanned leather based on emulsion - Nano particles of styrene/butyl acrylate co-polymers / E. H. A. Nashy in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 9 (09/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 9 (09/2011) . - p. 241-248 Titre : Novel retanning agents for chrome tanned leather based on emulsion - Nano particles of styrene/butyl acrylate co-polymers Type de document : texte imprimé Auteurs : E. H. A. Nashy, Auteur ; A. I. Hussein, Auteur ; M. M. Essa, Auteur Année de publication : 2011 Article en page(s) : p. 241-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère styrène acrylate de butyle Copolymères en émulsion Cuirs et peaux Microscopie électronique à balayage Microscopie électronique en transmission Nanoparticules Retannage Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The retanning process is a very important step in the leather manufacturing because it overcomes some of the disadvantages of chrome tannage. For this purpose, two different nano-emulsions of styrene/acylate copolymers were prepared using seed emulsion polymerization technique. The main difference and characteristics of the two copolymer emulsions were studied. In addition, the morphology and the nano-particle size of the copolymer emulsions was proved by transmission electron microscope (TEM). The influence of the prepared copolymer emulsions as retanning agents for chrome tanned leather was also studied. The physico-mechanical properties of the retanned leather, namely, tensile strength, elongation at break and tear strength, were measured. Thermal stability and texture of grain surface and fibers of chrome tanned leather were ewamined using thermal gravimetric analysis (TGA) and scanning electron microscope (SEM), respectively. All these parameters were the main target of this work and used to evaluate the applicability of the copolymers as efficient retanning agents. The results showed an improvement in the physico-mechanical properties, softness, and firmness of grain as well enhancement in thermal stability upon retanning by the prepared copolymer emulsions. Note de contenu : MATERIALS AND TECHNIQUES : Raw materials - Pre-emulsion - Seeded emulsion polymerization - Leather samples preparation - a-Neutralization process - b- Retanning process - c- Dying process - Tranmission electron microscope (TEM) examination - Mechanical properties - Stitch tear (single hole) - Color measurements - Thermal analysis - Scanning electron microscope (SEM) examination - RESULTS AND DISCUSSION : Characterization of the prepared copolymer latexes - Mechanical properties - Colour measurements - Thermal stability study (TGA) - Scanning electron microscope (SEM) En ligne : https://drive.google.com/file/d/1OGqVJqLPbUolrofwx9alMc0W8sn67_xk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11885 [article]

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