High-performance waterborne UV-curable polyurethane dispersion based on thiol–acrylate/thiol–epoxy hybrid networks / Vikash Mishra in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1069-1081 Titre : High-performance waterborne UV-curable polyurethane dispersion based on thiol–acrylate/thiol–epoxy hybrid networks Type de document : texte imprimé Auteurs : Vikash Mishra, Auteur ; Jatin Desai, Auteur ; Kalpesh I. Patel, Auteur Année de publication : 2017 Article en page(s) : p. 1069-1081 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Polyacrylates Revêtements -- Propriétés chimiques Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet Thiols Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis, characterization, and film performance of waterborne thiol–acrylate/thiol–epoxy hybrid coatings are highlighted in this article. A dimer acid-modified epoxy (DME) polyol, containing both hydroxyl and epoxy functional groups, was prepared by reacting epoxy resin (EEW = 190 g/equi) with dimer fatty acid at 2:1 molar ratio. Further, a base UV-curable polyurethane acrylate dispersion (UV-PUD), with a pendant epoxy functional group, was prepared by reacting polyol (DME), isophorone diisocyanate, and dimethylol propionic acid and end-capped with hydroxyethyl methacrylate with subsequent dispersion in water. Prepared intermediates were characterized for the parameters relevant to the study by physical, spectroscopic, and chemical methods. UV-curable thiol–acrylate/thiol–epoxy hybrid coatings were prepared by blending UV-PUD with trimethylolpropane tris(3-mercaptopropionate) (TMPMP) at four different thiol ratios (0, 0.3, 0.6, and 1.0) with respect to acrylate/epoxy groups. Cured films of the hybrid coating were identified by FTIR spectroscopy. The impact of thiol ratio on film performance was evaluated in terms of mechanical, chemical, thermal, and coating properties. The gel content measurements confirm that the addition of TMPMP increased the double bond conversion along with the epoxy group. Evaluation of cured samples shows the significant improvement in storage modulus, glass transition temperature, tensile strength, and hardness with increase in thiol ratio. The cured films possessed excellent water and acid resistance (<4%) even after 28 days of immersion. Moreover, the notable improvement was alkali resistance of cured films, i.e., as thiol ratio was increased from 0 to 1, weight loss in alkaline environment deceased from 49.5 to 4.5% after 28 days. Better properties of the thiol–acrylate/thiol–epoxy hybrid films will allow it as a potential application in low-volatile high-performance coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of dimer-modified epoxy polyol (DME) - Synthesis of hybrid UV-curable polyurethane dispersion (UV-PUD) - Preparation of hybrid UV-curable coatings and their cured films - Measurements - RESULTS AND DISCUSSION : Physicochemical characterization of DME and UV-PUD - FTIR analysis of intermediates and cured film - Dynamic mechanical properties of thiol-acrylate/thiol-epoxy hybrid networks - Mechanical properties of the hybrid systems - Thermal stability of cured films - Gel fraction - Chemical, water, and solvent resistance - Coating performance properties DOI : 10.1007/s11998-016-9906-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9906-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29142 [article]

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