Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness / Daidong Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 415-428 Titre : Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness Type de document : texte imprimé Auteurs : Daidong Wei, Auteur ; Bing Liao, Auteur ; Qiwen Yong, Auteur ; Huiyi Wang, Auteur ; Tao Li, Auteur ; Jianheng Huang, Auteur ; Hao Pang, Auteur Année de publication : 2019 Article en page(s) : p. 415-428 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Huile de ricin et constituants Humidité -- Absorption:Eau -- Absorption Polyesters Polymères -- Synthèse Polymères en émulsion Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements en phase aqueuse Rhéologie Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis, characterization, and coating performance of castor oil (CO)-based waterborne hyperbranched polyurethane acrylate (WHPUA) emulsions are highlighted in this work. Herein, a second-generation CO-based hyperbranched polyester (C20) was synthesized by introducing the renewable CO as a B3 core and dimethylolpropionic acid as an AB2 monomer via a pseudo-one-pot condensation procedure. Three types of CO-based WHPUA emulsions were prepared through the addition of the hyperbranched C20 with maleic anhydride (MA) and the isocyanate-bearing semiadduct (IPDI-HEA) at different MA/IPDI-IH molar ratios without the addition of any emulsifiers. The prepared emulsions were further formulated into UV-curable coating formulations and exposed to a medium-pressure mercury lamp. Consequently, the obtained UV-cured coatings exhibited outstanding adhesion performance, excellent transparency, and an acceptable degree of final double bond conversion. Owing to a relatively low concentration of hydrophilic units and a large number of acrylate functionalities in the waterborne oligomer, the obtained films were endowed with high crosslinking density and low hydrophilic nature, thus producing enhanced tensile strength, pencil hardness, water resistance, and chemical resistance. Due to their combination of renewable materials, a waterborne system and a UV-curing technique, these CO-based WHPUA emulsions offer promising opportunities to be used as environmentally friendly coatings. Note de contenu : - EXPERIMENTAL : Materials - Materials - Synthesis of the second-generation hyperbranched polyester (C20) - Synthesis of the CO-based WHPUA emulsions (WCM&.5I8.5s WCM2I88, and WCM2.4I7.5) - UV-curable coating formulations and UV-curing - Characterization - RESULTS AND DISCUSSION : Synthesis and structure characterization - Appearance, stability, viscosity, and particle diameter distribution - Rheological behavior - Curing kinetics and boule bond conserson - Mechanical properties and performance of the UV-cured coatings - Gel content and water absortion of the UV-cured films - Chemical resistance of the UV-cured films - Thermal properties and transparency of the UV-cured films - COMPLIANCE WITH ETHICAL STANDARDS DOI : 10.1007/s11998-018-0120-1 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32413 [article]

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