Optimization of leather filling composition containing SiO2 nanoparticles / A. H. Danylkovych in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 9 (09/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 9 (09/2019) . - p. 333-343 Titre : Optimization of leather filling composition containing SiO2 nanoparticles Type de document : texte imprimé Auteurs : A. H. Danylkovych, Auteur ; O. I. Korotych, Auteur Année de publication : 2019 Article en page(s) : p. 333-343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Dioxyde de silicium Modèles mathématiques Nanoparticules Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The global leather industry is looking for a cleaner leather processing technology to overcome its negative environmental impact. As an alternative to conventional processing, an eco-friendly filling composition based on fumed silica was developed and tested for the production of leather materials. Polycriterial optimization of the filling composition containing silica nanoparticles was conducted using the McLean-Anderson method by considering the type of mathematical model of the process “content-properties”. For optimization of the experimental conditions a multithreaded program based on calculation of informative and dispersive matrices and their determinants was developed. The optimal formulation of filling composition for the production of flexible leather materials was established and experimentally tested. The developed technology yields leather materials with increased volumetric yield and elasticity and more homogeneous microstructure when compared to the current company technology. The mathematical modelling discussed in the paper can be also used to solve similar problems for other technological processes. Note de contenu : - Mathematical model : Definition - Mathematical model : Optimization - Mathematical model : Testing En ligne : https://drive.google.com/file/d/1SACeSe0nCoDPoCRzFr_L1a29Gvhqbkcf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32901 [article]

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Regeneration of raw hide water balance by electrochemically activated water / A. H. Danylkovych in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 10 (10/2020) . - p. 355-364 Titre : Regeneration of raw hide water balance by electrochemically activated water Type de document : texte imprimé Auteurs : A. H. Danylkovych, Auteur ; O. I. Korotych, Auteur ; O. Romaniuk, Auteur Année de publication : 2020 Article en page(s) : p. 355-364 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuir et peau de cheval Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Electrochimie Humidité -- Absorption:Eau -- Absorption Peaux brutes -- Trempe Solutions aqueuses (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Improving the collagen structure, which was impacted by the curing process, increases the efficiency of all subsequent structural transformations during leather production and results in the formation of a high-quality leather material. Herein, we studied the process of soaking green-salted horsehides in electrochemically activated aqueous solutions and the properties of resulting chrome-tanned leather. It was found that the process of soaking horsehides can be effectively carried out using an electrochemically activated solution (ECAS) – a mixture of catholyte and anolyte at a volume ratio of 5 : 1. Using this soaking solution, sodium sulfide (an environmentally harmful reagent), sodium carbonate, and detergent can be completely excluded from the technological solution. The use of ECAS at the soaking stage effectively regenerates the water balance of horsehides while maintaining a stable pH during the soaking process and increases the efficacy of liming and all subsequent processes. Considering the prominent structural differences (density and thickness) between the front and shell of horsehide, the developed method, which utilize ECAS for soaking, allows the entire process to be carried out on uncut horse hides instead of processing two parts separately, which is normally required. The chrome-tanned leather produced by the developed method in semi-industrial conditions has elastic-plastic properties which are superior compared to the leather produced by current technology. The developed method also results in increasing the area yield by 2.5%. The resulting elastic leather can be used for manufacturing a variety of articles, including clothing, accessories, and footwear. Note de contenu : - MATERIALS AND METHODS : Laboratory testing - Semi-industrial testing - Physicochemical characterization - RESULTS AND DISCUSSION : Structure and composition of raw hides - Water absorption by horsehide - Properties of the horse leather produced in semi-industrial conditions DOI : https://doi.org/10.34314/jalca.v115i10.4173 En ligne : https://drive.google.com/file/d/1bLcuV1I1rbEzlX_BGYBxTNFiJbEz5PRL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34610 [article]

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