Polypropylene geotextiles were treated with multicomponent composite emulsion consist of polytetrafluoroethylene (PTFE), nona-silica and fluorous acrylate. After process of treatment, the treated geotextiles showed greater long-term stability and security than untreated geotextiles on the landfill slope. Firstly, the surface of fibers was investigated by scanning electron microscopy (SEM). Composite thin film was found on them, indicating the successful attachment of ternary composite agents on fibers through pad-drying method. Subsequently, the effect of weathering stability and metallic ions (cupric ions usually) resistance on mechanical properties of samples were studied by using tensile machine. The friction angle values of various interfaces and tension in geotextile versus slope angle were also studied via tilt table test. Our mechanics performance tests indicated that the weathering ability and cupric ions resistance of geotextile were greatly improved via treatment with the composite emulsion. The roughness of geotextile surface, the friction angles of all interfaces and tension in geotextile on landfill slope were decreased.
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