Anti-asphalt properties of PPS/PTFE composite coatings at high temperature

During the process of preparing coal tar pitch and petroleum asphalt, it is technically difficult to remove adhered asphalt through heating, chemical solvents, mechanical methods, etc. In this paper, polyphenylene sulphide/polytetrafluoroethylene (PPS/PTFE) composite coatings were fabricated on stainless steel specimens to study the adhesion of asphalt. Specimens were immersed in hot asphalt and taken out to calculate the coverage area, which was set as the standard for measuring the anti-asphalt properties. Moreover, the surfaces of the PPS/PTFE composite coatings were investigated by means of scanning electron microscopy (SEM), Fourier transform-infrared spectroscopy (FT-IR) and energy-dispersive system (EDS). As the FT-IR and EDS results reveal, the PPS generated a severely oxidative reaction, and the PTFE macromolecule chain shifted gradually from the coating's interior to the surface. The PPS/40%PTFE coating exhibited the most adequate performance, which showed the best anti-asphalt behaviour, high temperature performance and strong adherence behaviours.