Synthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 7 (07/2017) . - p. 240-249 Titre : Synthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents Type de document : texte imprimé Auteurs : Ren Long-Fang, Auteur ; Zhao Yong-Xia, Auteur ; Zhang Hua, Auteur Année de publication : 2017 Article en page(s) : p. 240-249 Note générale : Bibligor. Langues : Américain (ame) Catégories : Chromatographie sur gel Cuirs et peaux -- Propriétés mécaniques Essais dynamiques Fourier, Spectroscopie infrarouge à transformée de Polyisocyanurate ester Polymères -- Synthèse Polymères à terminaison hydroxyle Polymères ramifiés Résonance magnétique nucléaire Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : AB2 monomer was synthesized by Michael addition of diethanolamine (DEA) and methyl acrylate (MA). Then the hydroxyl-terminated hyperbranched poly isocyanurate-ester with different generations (HPICEs) which were named as HPICE-I, HPICE-II and HPICE-III, were prepared respectively via three-(2-hydroxycthyl) isocyanurate (THEIC) and AB2 monomer in which THEIC was used as the core and AB2 monomer as the branching unit. The structure and mass of HPICEs were characterized by Fourier Transform Infrared Spectra (FT-IR), nuclear magnetic resonance hydrogen spectra (•H-NMR) and gel permeation chromatography (GPC). HPICEs were applied in the retanning process of wet blue leather. The results show that when the dosage of HPICEs retanning agent is 3% (basing on the weight of wet blue leather), the properties of leather retanned with HPICE-III are the best compared with those retanned with HPICE-I and HPICE-II. The thickening percentage of the back and belly were 14.88% and 20.54%, respectively. Compared with that of leather retanned with RST, a kind of acrylic retanning agent widely used in the market, the tearing strength, tensile strength and cracking strength of the leather retanned with HPICE-III are increased by 53.31%, 65.69% and 85.28% respectively. All the leather samples retanned by HPICEs exhibited better dry rub fastness but worse wet rub fastness than that retanned by RST. In addition, the samples present better surface properties as well. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of HPICE - Solid content testing - Solubility testing - the pH testing - Fourier Transform Infrared Spectroscopy (FT-IR) - Nuclear magnetic resonance hydrogen spectra (1H-NMR) - Gel permeation chromatography (GPC)1 - Retanning procedure - Test of thickening percentage - Test of tensile strength, tearing strength and cracking strength - Test of dry and wet rub fastness - Organoleptic properties of retanned leathers - RESULTS AND DISCUSSION : HPICEs characterization solubility - FT-IR analysis - H-NMR analysis - GPC analysis - Result of thickening percentage - Results of tensile strength, tearing strength and cracking strength - Results of dry and wet rub fastness - Optimization of the dosage of HPICE-III - Organoleptic properties En ligne : https://drive.google.com/file/d/1nOroC3Fpkwkl71cCtSTxUZxAk9CISNYA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28822 [article]

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