Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings / Aohuan Guo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1311-1320 Titre : Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Aohuan Guo, Auteur ; Jianben Xu, Auteur ; Caili Yu, Auteur ; Faai Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 1311-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluoropolymères Polyacrylates Polymérisation en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés mécaniques Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Traditional two-component waterborne polyurethane (2K WPU) has low water resistance, which limits its application in the wide field. In this work, fluorine-modified 2K WPU films (2K-WFPUs) were successfully prepared using a fluorine-modified acrylate emulsion as hydroxyl component and a hydrophilically modified polyisocyanate as curing agent. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis indicate that hexafluorobutyl acrylate (HFBA) was successfully introduced into the 2K-WFPUs. The effects of HFBA content on the surface, thermal stability, water resistance, mechanical, and application properties of 2K-WFPUs were investigated. Compared with the unmodified film, with the increase in HFBA level from 0 to 8%, the static water contact angle of 2K-WFPUs increased from 66° to 92°, the surface-free energy decreased from 42.7 to 28.4 mJ m−2, the water absorption reduced from 15.9 to 9.9%. Thermogravimetric analysis shows that the thermal stabilities of 2K-WFPUs were improved remarkably. Meanwhile, adding HFBA did not weaken the impact resistance, flexibility, and adhesion of 2K-WFPUs and maintained the highest level. The fluorine-modified 2K WPU coatings have potential application in wood furniture and automotive finishing. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the fluorine-containing acrylate emulsion - Preparation of 2K-WFPUs - Characterization - RESULTS AND DISCUSSION : Characterization of the emulsion - FTIR analysis - TGA analysis - DSC analysis - Surface analysis - Water resistance - Coating properties - Table 1 : Feeding monomer mixture recipe for preparation of emulsion - Table 2 : Mechanical and film properties of the 2K-WFPU coatings DOI : https://doi.org/10.1007/s11998-023-00893-1 En ligne : https://drive.google.com/file/d/1bSiVfzJh9q7RBxYlzKJWwxD3GjMFwWv_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41299 [article]

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