Ultrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 277-287 Titre : Ultrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; P. T. Anusha, Auteur ; Radhika Narayan, Auteur ; M. Shravya, Auteur Année de publication : 2013 Article en page(s) : p. 277-287 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Cuirs et peaux Cuirs et peaux -- Finition Diffusion (physique) Granulométrie 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. Phénols Polyacryliques Retannage Statistique Syntans Ultrasons Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Retanning is one of the essential steps in leather processing. It follows the primary tanning process, utilizing synthetic tanning agents (syntans) in order to impart certain functional properties to the final leather. This research study aimed at investigating the effect of ultrasound (US) on the uptake of syntans in the retanning process as compared to magnetic stirring (MS) process control. Different types of syntans based on phenolic, melamine resin and acrylic compound were investigated. The influence of process parameters such as US power, process time, float, syntan offer, US pulse mode were studied. The effects of pre-sonication of substrate (leather) as well as substance (syntan solution though particle size analysis) were also investigated. There was the possibility of about 10% to 60% increase in exhaustion due to the use of US over MS for different syntans under various process conditions. The Apparent Diffusion coefficient (D) of syntan through the leather matrix was calculated from the experimental uptake data, which indicates significant improvement (~1.5 times) in the D value due to US over MS under the given process conditions. Therefore, the present study clearly indicates positive influence of ultrasound on diffusion of these special types of organic compounds (syntans) through more complex porous matrix such as leather, leading to significant improvements in diffusion rate of syntans, considerable savings in process time and subsequent enhancement in the quality of retanned leathers. Note de contenu : - Ultrasound in leather application - Experimental set-up - Process details (all the % based on shaved wet-blue weight) - Analytical procedure - Calculation of process intensification parameters enhancement in uptake of retanning agents - Diffusion co-efficient of syntans through leather matrix - Effect of process parameters, effect of ultrasound and type of syntan on uptake on syntan - Effect of ultrasound on apparent diffusion coefficient of syntans - Effect of ultrasound on substrate : pre-sonication of leather - Effect of ultrasound on substance : particle-size analysis of syntans - Effect of ultrasound pulse mode - Effect of combination of syntans - Effect of retanning with two pieces - Effect of ultrasound and type of syntan on uptake on syntan (a. phenolic syntan, b. melamine resin syntan, c. acrylic syntan) - Statistical analysis En ligne : https://drive.google.com/file/d/1nEKS3fHXRhiWa_xxak8YLWRhXXNFjYET/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19012 [article]

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