Hyperbranched polyurethanes with flammability resistance for leather retanning / Sheng Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 10 (10/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 10 (10/2022) . - p. 441-447 Titre : Hyperbranched polyurethanes with flammability resistance for leather retanning Type de document : texte imprimé Auteurs : Sheng Ding, Auteur ; Yiban Wu, Auteur ; Zhu Jinxing, Auteur ; Saiqi Tian, Auteur Année de publication : 2022 Article en page(s) : p. 441-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie Caractérisation Cuirs et peaux -- Propriétés mécaniques Essais (technologie) Inflammabilité Mesure Polymères -- Synthèse Polymères ignifuges Polymères ramifiés Polyuréthanes Retannage Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, diethyl bis(2-hydroxyethyl) aminomethyl phosphonate was modified by hexamethylene diisocyanate, and then was utilized to partly replace the isocyanates to prepare hyperbranched polyurethanes (HPU-DPAs). The hyperbranched polyurethanes were then employed in the retanning process of wet blue. The shrinkage temperature, average thickness as well as mechanical properties of leather before and after retanning were acquired. The flammability of retanned leather was measured by cone calorimeter test. The morphologies of wet blue and leather after retanning by HPU-DAP were obtained using a scanning electron microscope. Results showed that the average thickness, tensile strength and elongation at break of leather were all improved after retanning. Retanning by HPU-DAPs can effectively increase flame retardancy of final leather. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polyurethand retanning agent (HPU) - Synthesis of hyperbranched polyurethane with flammability (HPU-DAP) - Retanning technology - Measurements - RESULTS AND DISCUSSION : Structure characterization - Application of FWPRA in retanning process - Flammability of retanned leather - Table 1 : Retanning process - Table 2 : GPC data, hydroxyl value as well as particle size of HPU and HPU-DPAs - Table 3 : Ts, average thickness and mechanical properties of leather - Table 4 : Main parameters from cone calorimeter test and vertical burning test DOI : https://doi.org/10.34314/jalca.v117i10.6184 En ligne : https://drive.google.com/file/d/1O_C0E7Ge3HR5Vt5IaW1eJee-K5ioerbX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38230 [article]

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