A kind of preparation method of anti-biological fouling ultra-hydrophilic microfiltration membrane

Abstract

The invention provides a preparation method of an anti-biological fouling ultra-hydrophilic microfiltration membrane, comprising the following steps: respectively preparing a polydopamine nanoparticle solution and a dopamine hydrochloride solution; immersing the microfiltration membrane in the dopamine hydrochloride solution and poly In the dopamine nanoparticle solution, repeat the above process at least once, construct a media layer containing polydopamine nanoparticles on the surface of the microfiltration membrane; A zwitterionic polymer coating is constructed on the surface of the microfiltration membrane of the guide layer; the super-hydrophilic microfiltration membrane prepared by the method of the present invention has a large surface roughness, good stability, strong hydrophilicity and anti-pollution ability, and long service life It can efficiently separate stable oil-water emulsion, high-viscosity oil-water mixture and protein solution, and has good anti-biological pollution performance against biological pollution such as bacteria and protein.

Description

technical field [0001] The invention relates to a preparation method of a microfiltration membrane, in particular to a preparation method of an anti-biological pollution ultra-hydrophilic microfiltration membrane. Background technique [0002] With the development of the economy, human beings' demand for energy is also increasing. Usually, the oil-water mixture is relatively simple to handle, and can be separated by traditional gravity separation, heating demulsifier and electric dehydration. However, due to the small particle size (less than 10 μm), the oil-containing emulsion is difficult to handle, especially the stable emulsion system. For the emulsion system, chemical demulsification separation, air flotation method and membrane separation method can be used for treatment. The chemical demulsification method is to add a demulsifier to the oil-water emulsion to promote the phase separation of oil and water, but the amount of demulsifier High, poor universality and other...

AI Technical Summary

Problems solved by technology

Hydrophilic modification of microfiltration membranes usually requires the introduction of hydrophilic substances to the surface of the substrate, and the immobilization of hydrophilic substances to the surface of the substrate requires some introduction into the structure of the substance and / or the surface of the substrate Specific interaction groups, which limit the types of modifiable materials to only a few types, and also limit the popularization and application of modification methods

According to mussel-like universal adhesion, universal hydrophilic modification can be performed on the surface of stainless steel filter, organic membrane and inorganic membrane, while in the current modification process, dopamine hydrochloride adheres to the surface of these substrates , it is not easy to form micro-nano structures or less micro-nano structures are formed, so its hydrophilicity and anti-pollution ability are poor

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