Preparation and Study of Silicone Polyurethane Low Friction Coating

In this work, polyether functional polydimethylsiloxane (PDPS) were introduced into the backbone of waterborne polyurethane (WPU) as a part of soft segment to synthesize a series of silicone polyurethane (PSU) emulsions by pre-polymerization method. Then the PSU coatings were prepared on the PET cloth by dip coating. The structure and performance of the coatings were characterized by Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), water dynamic contact angles (DCA), friction coefficient and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS). The effect of the molecular weight and content PDPS on friction property of the PSU coatings was analyzed. The results showed that PDPS size and content had an evident influence on the lubricity of PSU coating, the friction coefficient of the coating was the lowest when the PDPS MW is 1000 and the content is 28 wt%. Moreover, the prepared PSU emulsion was greatly stable.