Abstract: Oil-water separation is one of the important processes in industrial production, and the demand for simple and environmental friendly oil-water separation and coalescence materials is increasing. In order to develop new superhydrophobic materials, nano silica was attached to the surface of polytetrafluoroethylene (PTFE) by using GMA as the intermediate. The results of XPS and SEM showed that nano silica was uniformly adhered to the surface of PTFE, resulting in a greatly increased surface roughness and a superhydrophobic layer. The oil removal experiment showed that the modified material had a good oil-water separation performance, good acid，alkali and salt-resistance, good stability and reusability. The materials used in the preparation of the new materials are from a wide range of sources and have good compatibility with other technologies, which have a broad application prospect in the oil-water separation industry.

Key words: oil water separation, SiO2 nanoparticle, grafting, superhydrophobic, modification