One-step formed hollow fiber nanofiltration membrane filament and preparation method thereof

Abstract

The invention provides a one-step formed hollow fiber nanofiltration membrane filament and a preparation method thereof, and solves the problems that the nanofiltration membrane preparation process istedious and the thickness of a coating layer or the cross-linking reaction degree is difficult to control. In the spinning process, a hydrophilic polyethyleneimine hydrophilic group can automaticallymigrate to the surface of a membrane for synchronous cross-linking reaction with glutaraldehyde or ethylene glycol in a core liquid in a phase separation process, a non-solvent phase separation process of a base membrane and a cross-linking reaction of a nanofiltration selection layer are carried out synchronously, by controlling the spinning speed and the core liquid temperature, interfacial polymerization or post-cross-linking step is not needed, and the internal pressure type hollow fiber nanofiltration membrane can be obtained by one-step forming.

Description

technical field [0001] The invention relates to the field of hollow fiber nanofiltration membranes, in particular to a one-step formed hollow fiber nanofiltration membrane filament and a preparation method thereof. Background technique [0002] Nanofiltration membrane (Nanofiltration Membranes) is a new type of separation membrane that came out in the late 1980s. Its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-2000. At present, roll-type nanofiltration membranes of many companies such as Dow and General Electric occupy a dominant position in the market. These membranes are composite membranes, which are prepared by interfacial polymerization and condensation. The surface of the basement membrane is made of a layer of ultra-thin separation layer (TFC) with nano-scale pores. [0003] However, interfacial polymerization and condensation methods have many disadvantages, such as high cost, low stain resistance, low resista...

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Problems solved by technology

[0005] The object of the present invention is to provide a hollow fiber nanofiltration membrane and a preparation method thereof in which the phase separation of the base membrane and the interfacial polymerization of the nanofiltration functional layer are carried out simultaneously, and the hollow fiber nanofiltration membrane solves the problem of anti-pollution of the membrane surface, The problem with large apertures

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