A new UV curable waterborne polyurethane: Effect of CC content on the film properties

A new ultraviolet (UV) curable waterborne polyurethane was prepared by modifying the conventional method of anionic aqueous polyurethane. Acrylate groups were introduced into the side chains and the end of the polyurethane main chains using the dihydric acrylate named as PEDA and the single-hydroxyl acrylate named as HEA. The CC content in the chain of the polyurethane was raised effectively and the maximum CC content achieved by this method is 4.5 meq/g. The structure was confirmed by the Fourier transform infrared spectroscopy (FTIR). The effects of different CC content were studied by evaluating various properties of the film such as the MEK resistance, hardness, thermal stability and the tensile properties. The curing rule of the polyurethane for different CC content had been investigated during the curing process.