PVDF/ionic liquid/PSU high-efficiency low-resistance filtering membrane and preparation method thereof

Abstract

The invention provides a PVDF / ionic liquid / PSU high-efficiency low-resistance filtering membrane and a preparation method thereof. The preparation method comprises the following steps: step S1, respectively preparing a PVDF solution and a PSU solution, adding an ionic liquid AmimCl into the PVDF solution, and carrying out mixing so as to obtain a PVDF mixed spinning solution; and step S2, placinga layer of a filtering cloth onto a receiving plate as a supporting material, respectively injecting the PVDF mixed spinning solution and the PSU solution into an electrospinning needle, and separately or simultaneously carrying out spinning so as to obtain the PVDF / ionic liquid / PSU high-efficiency low-resistance filtering membrane. By adoption of a technical scheme of the invention, the filteringmembrane obtained by using the preparation method provided by the invention has multiple filtering effects of electret filtration, interception filtration and the like; meanwhile, due to large diameter of PSU fiber and small diameter of PVDF fiber, the resistance of filtration is reduced, and the efficiency of filtration is increased at the same time.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a PVDF / ionic liquid / PSU high-efficiency and low-resistance filter membrane and a preparation method thereof. Background technique [0002] In recent years, the harm of air pollution to human health has been increasing, and it is necessary to develop high-efficiency, low-resistance and durable air filter materials. At the same time, with the continuous improvement of people's environmental protection and health awareness, the inhibition and killing of microbial pathogens is particularly important. Existing high-efficiency air filtration technologies mainly include electrostatic dust collection filtration technology, electrostatically enhanced fiber filtration technology, stretched membrane filtration technology, fiber filtration technology, etc. Among them, fiber filtration technology has the advantages of good filtration performance and strong environmental adaptabi...

AI Technical Summary

Problems solved by technology

Due to the continuous increase of pollutant particles deposited inside the material during its service, the particles coated on the surface of the fiber will shield the electrostatic adsorption of the filter material, resulting in a significant decrease in its performance

[0004] Therefore, although the current electrospun nanofiber membrane materials can achieve high filtration efficiency, the resistance pressure drop is still high, and it is difficult to meet the current demand for high-efficiency and low-resistance air filtration materials. How to achieve resistance while maintaining high efficiency The further reduction of pressure drop is a problem to be solved for the application of electrospun nanofibers in the field of air filter materials

In addition, although electrospun nanofibers can filter particulate matter, how to obtain fibers with better piezoelectric properties and high uniformity of pores has a great impact on improving filtration performance.

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