Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating / Dijun Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 1109-1116 Titre : Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating Type de document : texte imprimé Auteurs : Dijun Huang, Auteur ; Yongxia Ren, Auteur ; Ruoning Yang, Auteur ; Zhiguo He, Auteur ; Youwei Yao, Auteur Année de publication : 2021 Article en page(s) : p. 1109-1116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Photoréticulation Réaction thiol-ène Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : A novel ultraviolet (UV)/thermal dual-curing thiol-ene/polyurethane acrylate (PUA) coating of PUA oligomer, tripropylene glycol diacrylate, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, and trimethylolpropane tris (3-mercaptopropionate) was prepared. The coating had a rapid surface drying rate with UV radiation (400 W, 50 W/cm2). For example, the surface of the novel thiol-ene/PUA coating dried within 3 s. The hardness, gel content, and initial decomposition temperature at 5 wt% weight loss of the UV/thermal dual-cured sample after 10 min of UV irradiation, followed by heating at 150°C for 20 min, were 37 D, 90.3%, and 302.2°C, respectively, which were higher than the 30 D, 87.7% and 284.9°C of the UV curing control after 10 min of UV irradiation. The curing time of the 1-mm-thick coating was 4.5 min in indoor sunlight (2.3 ± 0.3 mW/cm2) with a gel content of 83.8%. This coating could be applied in the rapid prototyping field with UV or sunlight exposure. Thermal treatment after UV curing could increase the crosslinking degree and influence the sample performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of thiol-ene/polyurethane acrylate coatings - Preparation of cured samples - Characterization - RESULTS AND DISCUSSION : FTIR characterization - Surface drying time with UV irradiation and curing time in sunlight - Gel fraction - Hardness - Thermal stability - Dynamic mechanical thermal performance - Table 1 : Detailed formulations of coatings 1/2 - Table 2 : Surface drying time of coatings 1/2 with UV irradiation - Table 3 : Actual curing time of coatings 1/2 in indoor sunlight - Table 4 : Gel content of cured samples of thiol-ene/PUA coating 1 - Table 5 : Hardness of cured samples - Table 6 : Thermal properties of different samples under Ar - Table 7 : DMTA properties and crosslink density of thiol-ene/PUA-cured samples DOI : https://doi.org/10.1007/s11998-021-00464-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00464-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36217 [article]

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