Preparation method of unilateral super-hydrophobic polyethersulfone membrane

Abstract

The invention discloses a preparation method of a unilateral super-hydrophobic polyethersulfone membrane. The method comprises the following steps: dissolving polyethersulfone into a solvent; preparing a polyethersulfone membrane through a dry-wet method; preparing silicon dioxide sol gel through a sol-gel method; modifying the silicon dioxide sol gel by utilizing fluorine-containing silane to prepare fluorinated silicon dioxide sol gel filtrate; depositing fluorinated silicon dioxide sol gel to one side of the polyethersulfone membrane by adopting a vacuum pumping filtration method, so as to obtain the polyethersulfone membrane with a unilateral super-hydrophobic property. The method disclosed by the invention is mainly used for the field of separation of membranes with the unilateral super-hydrophobic property, and can be used for preparing nano materials of membrane-absorption, membrane-analysis and gas-liquid membrane contactor methods. The method is simple and easy to operate; the prepared membrane has a good membrane hydrophobic property and the preparation cost is greatly reduced.

Description

Technical field [0001] The invention belongs to the technical field of separation membranes, and specifically relates to a preparation method of a unilateral superhydrophobic polyethersulfone membrane. Background technique [0002] Gas-liquid membrane contactor technology has quickly become a new type of membrane due to its stable gas-liquid mass transfer interface, high specific surface area, small volume, modularity, easy scale enlargement and reduction, and independent control of the flow rate of gas and liquid. The technology has been widely studied and applied in membrane absorption, membrane analysis, membrane distillation, and gas-liquid membrane contactor preparation of nanomaterials, and has attracted widespread attention from related researchers. In the research and application of gas-liquid membrane contactor technology, the hydrophobic properties of membrane materials are the key to the successful application of membrane contactors. In the process of membrane absorpt...

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Problems solved by technology

The process for preparing superhydrophobic polytetrafluoroethylene hollow fiber membranes provided by this patent is cumbersome, requiring steps such as mixing, compacting, extrusion molding, silica sol treatment, stretching, heat setting and perfluorosilane treatment; pushers, Large-scale equipment such as stretching and sintering; since the PTFE material itself is a highly hydrophobic membrane, the improvement of hydrophobic performance is not obvious; in addition, the air permeability of the PTFE hollow fiber membrane produced by this process is poor

[0004] Chinese Invention Patent Publication No. CN 103285746 A discloses a method for preparing a super-hydrophobic membrane for removing dissolved gases in water. Inorganic nanoparticles with low surface energy modified by a coupling agent and hydrophobic polymer PVDF are co- After mixing, a super-hydrophobic film for removing dissolved gases in water is prepared by phase inversion method. In order to obtain the surface of the super-hydrophobic film, most of the inorganic nanoparticles with low surface energy modified by the coupling agent are used in this process. Dispersed inside the membrane, because the price of the material with low surface energy is relatively expensive, for the gas-liquid membrane contactor membrane that only needs to be superhydrophobic on the contact side with the liquid, the preparation method of this superhydrophobic membrane has a certain waste

[0005] Chinese Invention Patent Publication No. CN101463140 A discloses a method for preparing a superhydrophobic polyvinylidene fluoride film and its products. After the PVDF film is subjected to plasma treatment, the hydrophobic modification is carried out by chemical or chemical vapor deposition of organosilane to obtain a superhydrophobic film. The PVDF membrane prepared by this process has hydrophobic properties on both sides. Since fluorine-containing silanes are expensive, there is a certain waste of membranes that require hydrophobic properties on one side. In addition, this process requires specific plasma equipment. Requires initial investment in equipment and high preparation costs