Hydrophilic single-layer porous membrane as well as preparation method and application thereof

Abstract

The invention discloses a hydrophilic single-layer porous membrane as well as a preparation method and application thereof, and belongs to the technical field of functional material preparation. The hydrophilic single-layer polymer porous membrane is finally prepared by preparing a membrane casting solution, scraping the membrane and utilizing a phase inversion method in sequence; by changing theinitial concentration of the membrane casting solution, the thickness of membrane scraping, the composition of a phase inversion solvent and the proportion of a mixed phase inversion solvent, asymmetric micro-nano holes with different pore sizes are controlled to be prepared in the opposite surfaces of the single-layer polymeric membrane, so that intelligent control on different permeation statesof the liquid is realized. The preparation method of the hydrophilic single-layer porous membrane disclosed by the invention is simple and feasible; the thickness, porosity and pore size of the prepared porous membrane are easy to control, and the porous membrane is low in cost, environment-friendly, safe, reliable and easy for industrial large-scale production, and can be well applied to the fields of liquid one-way permeation, dressings or functional textiles for quickly drying wounds and directional transportation.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a hydrophilic single-layer porous membrane and its preparation method and application, especially to the preparation of a single-layer porous membrane with an asymmetric surface pore size and the application of the porous membrane to a liquid monolayer Dressings or functional textiles for penetrating, fast-drying wounds, and directional transportation. Background technique [0002] Directed permeation of liquids, that is, liquids can permeate from one surface of the membrane to another surface, but the reverse direction is blocked, which is in intelligent liquid manipulation, designing advanced liquid delivery systems, rapidly drying wound dressings, functional textiles and chip microfluidics played an irreplaceable role. Researchers have densely packed porous structures with different pore sizes and opposite wettability, and multilayers into membrane...

AI Technical Summary

Problems solved by technology

[0003] At present, although people are accustomed to applying the combination of multi-layer fabrics to achieve the asymmetry of structure and wettability, and then realize the one-way permeation of liquid, the multi-layer structure of porous materials also leads to complicated preparation and adjustment processes and in the environment. Instability, easy delamination and poor mechanical properties

And the liquid penetrates from the hydrophobic side to the hydrophilic side, and the required initial driving pressure is relatively large

At the same time, in a hydrophilic environment, it is difficult to control the direction of the liquid with hydrophilic porous materials because the liquid flow is often bidirectional.

Therefore, how to design and prepare a hydrophilic single-layer porous membrane to realize the directional permeation of liquid is still a great challenge.

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