Preparation and performance of polyethylene-based reverse osmosis membrane
The structure and chemical properties of the bottom membrane have an important effect on the performance of reverse osmosis membrane.In this paper,the effect of three kinds of hydrophilic modification methods on the performance of reverse osmosis membrane after hydrophilic modification of PE bottom membrane was investigated.The flux and desalting rate of reverse osmosis membrane prepared by PE substrate without hydrophilic modification are poor,and the desalting layer is relatively thin,which is easy to have defects.The flux and desalting rate of the reverse osmosis membrane prepared by the hydrophilic modified PE bottom membrane were improved,but they were still lower than that of the traditional PSF bottom membrane.Due to the strong hydrophobicity of the PE bottom film and the large pore structure on the surface,not only a certain hydrophilic modification is required,but also the formation of a continuous water film liquid surface on the surface of the PE bottom film to form a continuous,complete and highly crosslinked polyamide desalination layer through the interfacial polymerization reaction.
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