Title: Synthesis and UV-curing kinetics of waterborne polyurethane acrylate modified by organic silicon
Abstract: The PUA prepolymer with isocyanate ending group has been prepared by the addition of isophorone diisocyanate( IPDI) with the mixture of polyethylene glycol( PEG600) and hydroxyl-ending polydimethylsiloxane( PDMS).And then using dimethlolpropionic acid( DMPA) as a hydrophilic,pentaerythritol triacrylate( PETA) as an UV-curing groups and triethylamine( TEA) as a neutralizer,the waterborne polyurethane modified with organosilicone( WPUA-Si)was eventually obtained through the emulsification. The structure and property of the WPUA-Si oligomer was characterized using infrared spectroscopy( FT-IR) and TG. The results show that water resistance and thermal stability of the UVcured film of the WPUA-Si oligomer was improved. The UV-curing kinetics of the WPUA-Si oligomer was also investigated by real time FT-IR. When the amount of photoinitiator Darocur1173 was 5wt%,UV-curing rate of the WPUA-Si oligomer was quickly and the conversion of the double bond was higher up to 90%. The light intensity of the radiation increasing can improve the UV-curing rate of the system.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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