SUPERHYDROPHOBIC POLYPROPYLENE POROUS FILM, PREPARATION METHOD THEREFOR, AND METHOD FOR IMPROVING HYDROPHOBICITY OF POLYPROPYLENE POROUS FILM

摘要

A superhydrophobic polypropylene porous film, comprising a polypropylene porous film substrate, a titanium dioxide layer, and a surface modifier layer. The titanium dioxide layer is deposited on the surface of the polypropylene porous film substrate by means of the atomic deposition technology; a surface modifier is coated on the titanium dioxide layer; hydrophobic bonds are formed between the titanium dioxide layer and the surface modifier layer; the water contact angle of the superhydrophobic polypropylene porous film is greater than 150 degrees, the rolling angle is less than 10 degrees, the aperture is 0.1-0.4 μm, the porosity is 50%-80%, the tensile strength is 30-50 MPa, and the elongation at break is 10%-30%. The superhydrophobic polypropylene porous film not only maintains the chemical resistance, rigidity, and porosity of the polypropylene porous film, but also has superhydrophobic properties, and still maintains a good separation effect after working for 80 hours, thus greatly increasing the service life, and reducing operation costs and working costs of a film distillation process.