Hollow fiber positively charged membrane and preparation method thereof

Abstract

The invention belongs to the field of separation, and particularly relates to a hollow fiber positively charged membrane and a preparation method thereof, and the preparation method comprises the following steps: mixing the following components in parts by mass: a styrene maleic anhydride random copolymer, a main material, a pore-foaming agent and a solvent; performing stirring at 60 DEG C for 24 hours, standing for 24 hours to form a membrane casting solution, and then extruding the membrane casting solution and the core solution from a hollow fiber spinneret plate into a coagulating bath for sizing to obtain a hollow fiber positively charged membrane containing exposed amino groups, wherein the main material is one or a mixture of more of polysulfone, polyether sulfone, polyvinylidene fluoride and polyvinyl chloride; when the internal pressure type hollow fiber positively charged membrane is synthesized, the core liquid contains a polyamine substance; when the external pressure type hollow fiber positively charged membrane is synthesized, the coagulating bath contains polyamine substances. The hollow fiber membrane prepared by the method provided by the invention is obviously positively charged, and the pollution resistance (the ratio of accumulated water yield to water yield) is also obviously improved.

Description

technical field [0001] The invention belongs to the field of separation, and in particular relates to a hollow fiber positively charged membrane and a preparation method thereof. Background technique [0002] The traditional method of preparing positively charged membranes needs to activate the hollow fiber membrane first, such as strong alkali, heating, radiation and other relatively strong conditions. The active sites are then transformed into positively charged groups through one or more chemical reactions. The process is complex, the conditions are severe, and a large amount of waste liquid is generated, so it is not suitable for large-scale production. Moreover, each membrane material has a different activation method, and the methods for transforming the active sites are also more diverse, which makes the scope of application of this method narrow, and it is necessary to develop different modification methods for each membrane material. Contents of the invention ...

AI Technical Summary

Problems solved by technology

The method is complicated, the conditions are severe, and a large amount of waste liquid is generated, so it is not suitable for large-scale production

Moreover, each membrane material has a different activation method, and the method of converting the active site is also more diverse, which makes the scope of application of this method narrower, and it is necessary to develop different modification methods for each membrane material.

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