A kind of hollow fiber nanofiltration membrane and preparation method thereof

Abstract

A hollow fiber nanofiltration membrane and a preparation method thereof. The nanofiltration membrane is composed of an inner layer of a polymer material, an outer layer of a polymer material, and an intermediate transition layer in which molecular chains of the inner layer and the outer polymer material are intertwined. The preparation method is that the inner layer polymer material and the outer layer polymer material are dissolved in a high-temperature diluent, and two co-rotating twin-screw extruders and three-channel spinnerets are used; the method of phase separation induced by temperature or solvent exchange is one step The inner layer of the bicontinuous pore structure and the outer layer of the nanoporous structure are obtained, that is, the hollow fiber nanofiltration membrane is obtained. The invention has the characteristics of high strength, backwash resistance, high selective separation performance and the like.

Description

technical field

[0001] The invention relates to a hollow fiber nanofiltration membrane with backwash resistance, oxidation resistance and high selective separation and a preparation method thereof. Background technique

[0002] The research and development of hollow fiber nanofiltration membrane is expected to lead the future of membrane technology. At present, the nanofiltration membrane is still mainly a composite roll membrane, but in the patents reported so far, the oxidation resistance and chlorine resistance of the composite nanofiltration membrane are very poor, and there will be problems of performance attenuation and lifespan reduction in long-term use. The hollow fiber nanofiltration membrane can realize the backwash of the oxidative cleaning agent, and the hollow fiber membrane can be made very thin, so that the hollow fiber membrane after being assembled into a module has a high packing density, and the effective filtration area of ​​the nanofiltration membrane i...

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