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AssigneeTianjin University of Science and Technology
InventorsNa Tang, Yangyang Song, Lei Zhang, Xingxing Shi, Songbo Wang, Penggao Cheng, Wei Du, Jianping Zhang
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A superhydrophobic polypropylene porous film, including a polypropylene porous film substrate, titanium dioxide layers and a surface modifier layer, is disclosed. The titanium dioxide layers are deposited on the surface of the polypropylene porous film substrate by atomic deposition technology; a surface modifier is coated on the titanium dioxide layers; hydrophobic bonds are formed between the titanium dioxide layers and the surface modifier layer; the superhydrophobic polypropylene porous film has a water contact angle greater than 150 degrees, a rolling angle less than 10 degrees, an aperture of 0.1-0.4 μm, a porosity of 50%-80%, a tensile strength of 30-50 MPa, and an elongation at break of 10%-30%. The superhydrophobic polypropylene porous film maintains the chemical resistance, rigidity, and porosity of the polypropylene porous film, and has superhydrophobic properties and a good separation effect after working for 80 hours, thus greatly increasing the service life, and reducing operation costs and working costs in a membrane distillation process.
A method of preparing a super hydrophobic polypropylene porous film, comprising, in sequence, depositing titanium dioxide layers on a surface of a polypropylene porous film substrate by atomic layer deposition, spraying a surface modifier comprising a nano-silicone emulsion on the titanium dioxide layers to obtain a polypropylene porous film with the titanium dioxide layers and a surface modifier layer thereon, and illuminating, rinsing and drying the polypropylene porous film with the titanium dioxide layers and the surface modifier layer thereon to form a hydrophobic Si—O—Ti bond between the titanium dioxide layers and the surface modifier to obtain the superhydrophobic polypropylene porous film, wherein the superhydrophobic polypropylene porous film has a water contact angle greater than 150°, a rolling angle less than 10°, a pore size of 0.1 μm to 0.4 μm, a porosity of 50% to 80%, a tensile strength of 30 MPa to 50MPa, and an elongation at break of 10% to 30%.
Dependencies are inferred from the claim text.