Preparation and coating properties of alkyd polyol-based autoxidizable waterborne polyurethane dispersions with high fatty acid content, long storage stability, and low viscosity / Zecheng Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 5 (09/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 5 (09/2024) . - p. 1713-1727 Titre : Preparation and coating properties of alkyd polyol-based autoxidizable waterborne polyurethane dispersions with high fatty acid content, long storage stability, and low viscosity Type de document : texte imprimé Auteurs : Zecheng Lin, Auteur ; Qingyuan Zeng, Auteur ; Yucheng Zhang, Auteur ; Yongbo Ding, Auteur ; Shuai Chen, Auteur ; Yongluo Qiao, Auteur ; Liang Shen, Auteur Année de publication : 2024 Article en page(s) : p. 1713-1727 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auto-oxydation Caractérisation Polyalkydes Polymères en émulsion Polyols Revêtements en phase aqueuse:Peinture en phase aqueuse Revêtements organiques Stabilité au stockage Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : In order to increase the concentrations of bio-based alkyd polyols (or fatty acids) in self-crosslinking polyurethane dispersions, herein, a series of novel alkyd polyol-based autoxidizable waterborne polyurethane dispersions (AWPUDs) with different fatty acid contents, long storage stability, and low viscosity were successfully prepared by adding dimethylol propionic acid (DMPA) self-emulsifier in the late stage of their synthesis. They and their corresponding curing films were characterized by Fourier transform infrared spectroscopy (FTIR), particle size analysis, rheology measurement, storage stability evaluation, thermogravimetric analysis, dynamic thermomechanical analysis (DMA), etc. The results showed that the addition process of DMPA played a critical role for the excellent features of AWPUDs. Additionally, the crosslinking density, gel contents, and water contact angles of AWPUD films increased with the enlarged fatty acid contents, whereas their water uptake capability decreased. Moreover, a series of AWPUD coatings were prepared, and their properties like drying times, hardness development, pencil hardness, adhesion capability, impact resistance, flexibility, and water resistances were all effectively improved with the increased fatty acid contents, significantly superior to those of waterborne alkyd coatings and waterborne polyurethane coatings without fatty acids. Note de contenu : - EXPERIMENTAL : - Materials - Preparation of alkyd polyols - Preparation of AWPUDs - Preparation of AWPUD films - Preparation of AWPUD coatings - Characterization - RESULTS AND DISCUSSION : - Molecular structure analysis - Particle size and resin appearance analysis of AWPUDs - Rheology property analysis of AWPUDs - Thermogravimetric analysis of AWPUD films - Dynamically mechanical analysis of AWPUD films - Gel content analysis of AWPUD films - Water contact angle and water uptake analysis of AWPUD films - Coating properties of AWPUD paints - Comparison of dispersion characteristics and coating properties DOI : https://doi.org/10.1007/s11998-024-00928-1 En ligne : https://drive.google.com/file/d/1BVzFmN7Cu1VKRYGwh3DscztARIlKwSro/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41522 [article]

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