Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings / Wei Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 607-616 Titre : Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings Type de document : texte imprimé Auteurs : Wei Dong, Auteur ; Lei Zhou, Auteur ; Yanni Guo, Auteur ; Yining Tang, Auteur ; Rong Pan, Auteur ; Mengli Liu, Auteur ; Deliang He, Auteur Année de publication : 2022 Article en page(s) : p. 607-616 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Benzotriazole Caractérisation Copolymère styrène acrylique Copolymères en émulsion Enrobage (technologie) Essais accélérés (technologie) Fluorure de silicium Formulation (Génie chimique) Polymérisation en émulsion Potentiel zeta Rayonnement ultraviolet -- Absorption Résistance aux conditions climatiques Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the weather ability and thermal stability of styrene-acrylic polymer emulsion coatings, a series of novel styrene-acrylic polymer emulsion modified with 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole (HMEB), hexafluorobutyl methacrylate (HFMA), and vinyl-trimethoxysilane (VTMS) were prepared through semi-continuous seed emulsion polymerization. The emulsions and their coatings were characterized by Fourier transform infrared spectroscopy, ultraviolet absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy, dynamic laser scattering, transmission electron microscopy, zeta potential, thermogravimetric analysis, and artificially accelerated aging test. According to the results, the new polymer emulsion had superior UV absorption from 308 to 364 nm. Moreover, the coating performed the best anti-aging stability when the content of HMEB, HFMA, and VTMS reached 4%, 2%, and 3%, respectively. After the 1000 h aging test, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 6.86% and 51.10%, while the unmodified coatings were 16.05% and 72.22%, respectively. Furthermore, the thermal stability and water resistance of the coating were improved by fluorine and silicon monomers. The initial decomposition temperature was increased from 327 to 339°C. Moreover, the UV stabilization mechanism is preliminarily discussed. Note de contenu : - EXPERIMENTAL : Materials - Pre-emulsification - Emulsion polymerization - Coating preparation - Characterization - RESULTS AND DISCUSSION : Basic properties of emulsions and the coatings - Zeta potential and DLS of emulsions - Morphology of emulsion particles - Chemical structure of emulsion polymer - Chemical composition of emulsion coatings - UV absorption property of coatings - Thermal stability of emulsion coating - The aging acceleration test of emulsion coatings - Protective properties of emulsion coatings - Table 1 : Emulsion polymerization formula - Table 2 : Basic properties of emulsions and the coatings - Table 3 : Surface composition of different coatings/atomic % DOI : https://doi.org/10.1007/s11998-021-00550-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00550-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37291 [article]

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