Synthesis and Properties of UV Curable Waterborne Polyurethane Acrylate Based on Modified Castor Oil

Abstract In this study, castor oil was modified to prepare hydroxyethyl methyl acrylate (HEMA) capped waterborne polyurethane-acrylate (UV-PUA) via in-situ and anionic self-emulsifying method. Ultraviolet (UV) curable UV-PUA film was obtained with IRGACURE 819 as photoinitiator. The properties of UV-PUA dispersions, such as appearance, viscosity and average particle size were investigated. The structure and thermal stability of UV-PUA film were characterized by Roman spectroscopy and DTG. Some mechanical properties of UV-PUA films, such as hardness, adhesion ability and water absorption property were measured. It was found that the viscosity of UV-PUA dispersion decreased while the average particle size increased with the increasing of n(NCO)/n(OH)  value. The decomposition temperature of the UV-PUA film shifted to higher temperature as increasing of NCO/OH molar ratio. The C=C bond absorption peak at 1640cm1 for UV-PUA film disappeared after UV radiation.

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