Preparation of UV-curable strippable coatings based on polyurethane acrylate from CO2-polyol and different isocyanates

Two different polyurethane acrylates (PUA) were synthesized from CO 2 -polyol (PPC2000), hydroxyethyl acrylate (HEA), and isophorone diisocyanate (IPDI), or hexamethylene diisocyanate (HMDI). The successful synthesis of the PUA was confirmed with Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance ( 1 H NMR), and gel permeation chromatography (GPC). Then, a series of UV-curable strippable coatings were prepared using the synthesized PUA, photo-initiators and reactive diluents. The mechanical properties , double bond conversion, peel strength of the coatings were characterized. The results revealed that the double bond conversion rate of this series of UV-curable strippable coatings were more than 94 %, and the 180° peel strength of the coating was as high as 2.57 N/cm. In addition, the surface decontamination performance of the different coatings were studied, the results showed that the coatings could remove upwards of 90 % of the contaminants from some of the tested substrates.