Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes / H. R. Asemani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 469-488 Titre : Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes Type de document : texte imprimé Auteurs : H. R. Asemani, Auteur ; V. Mannari, Auteur Année de publication : 2021 Article en page(s) : p. 469-488 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétoacétate Caractérisation Essais (technologie) Matériaux hybrides Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Oligomères Photoréticulation Polymères -- Synthèse Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Revêtements sans isocyanates Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Preparation of ambient and UV curing non-isocyanate polyurethane (NIPU) coatings has been reported using a series of acetoacetylated non-isocyanate polyurethane (AA-NI-PUPO) oligomers. Synthesized oligomers were characterized using various techniques such as Fourier transform infrared and nuclear magnetic resonance spectroscopy. AA-NI-PUPOs showed significantly lower viscosity compared to their non-acetoacetylated counterparts. Ambient temperature-cured systems were formulated by mixing AA-NI-PUPOs and different primary amine compounds in stoichiometric proportions. Michael addition reaction of acrylates and AA-NI-PUPOs was initiated by UV curing using a photobase generator as the catalyst. NIPU coatings were studied for various thermo-mechanical properties and corrosion resistance. The selected UV-cured and ambient-cured samples showed instant and 1-h tack-free time, respectively. Results revealed that with proper selection of acetoacetylated resin and crosslinker type, coatings with properties comparable to conventional PU coatings could be formulated. Moreover, UV-curable coatings with up to 90 wt% solid could be formulated using conventional monomeric acrylates as a reactive diluent. The study demonstrates the feasibility of formulating solvent-free rapid ambient curing non-isocyanate polyurethane coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of oligomers - Preparation of coating compositions - Test methods - RESULTS AND DISCUSSION : Characterization of AA-NI-PUPOs - Viscosity measurements - Curing characterization of UV-NIPUs - Cured-film properties - Table 1 : List of acronyms used to identify oligomers and coating systems - Table 2 : Characteristics of different resins used in this study (Mn: number average molecular weight, AA : acetoacetate) - Table 3 : Screening results for A-NIPU coating samples - Table 4 : Screening results for UV-NIPU coating samples - Table 5 : Extended coating properties for selected A-NIPU coating samples - Table 6 : Extended coating properties for selected UV-NIPU coating samples - Table 7 : Tg, Td5% and Td50% values obtained from DSC and TGA analyses for selected NIPU coating samples DOI : https://doi.org/10.1007/s11998-020-00425-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00425-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35608 [article]

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