Porous air filtering film as well as preparation method and application thereof

Abstract

The invention provides a porous air filtering film as well as a preparation method and application thereof. The porous air filtering film comprises a porous substrate material and a polymer layer which covers fibers of the porous substrate material and has a pyroelectric function. The porous air filtering film disclosed by the invention can retain fine particles which are much smaller than pores of the porous air filtering film, is high in dust holding capacity, high in filtering efficiency and low in air filtering resistance, and can be regenerated for repeated use. According to the preparation method, the fibers of the porous substrate material are covered with the polymer layer with the pyroelectric function through a spraying method, so that the porous air filtering film is prepared, and the preparation method is simple, mild in preparation condition, low in energy consumption and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a porous air filter membrane and its preparation method and application. Background technique [0002] In the background of continuous industrialization and urbanization, the consumption of energy and resources is also increasing, and the environmental pollution problems caused by it cannot be ignored more and more. At the same time, people's living standards are gradually improving, especially for living, office, travel vehicles, leisure and entertainment places, etc. The air quality requirements for indoor and car enclosed environments are getting higher and higher, and the demand for various air purification products is increasing. more exuberant. [0003] All kinds of air purification products currently on the market, the core of the product lies in the filter medium. The filter medium used by most of the products is a high-efficiency particulate air filter (HE...

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Problems solved by technology

However, the main disadvantage of this type of material is that its charge is seriously affected by the use environment (such as high temperature, high humidity, etc.), so its service life is short and cannot be reused, and its waste after use will also produce hazardous materials. Waste and other secondary pollution

[0004] CN106237717A discloses a high-efficiency and low-resistance electrospinning nanofiber air filter material and a batch preparation method. The filter material is a sandwich structure in which spunbond nonwovens and nanofibers are arranged alternately; a needle-free electrostatic spinning nozzle is used, and then Nanofiber / microsphere composite membranes are prepared by synchronously combining electrospinning and electrostatic spraying technology. Although this invention can realize batch production of nanofiber filter materials, it has low filtering ability for fine dust in the air, and The utilization rate of filter material regeneration and reuse is low

[0005] CN107583377A discloses a functionalized graphene-modified air filter membrane and a preparation method thereof. The composite filter membrane includes two parts: a non-woven base support layer and an electrospun composite fiber dense layer. The filter membrane can be ground with low resistance. Filter fine particles such as smog, pollen, PM2.5 in the air, but after long-term use, functionalized graphene is easy to agglomerate into large graphite particles, resulting in a decrease in adsorption capacity, and the air filter membrane is also difficult to regenerate for repeated use

The fiber network structure formed by the composite material has relatively large porosity and weak adsorption capacity for fine particles such as PM2.5, and the composite material is made by melting hot pressing method, which has high material cost and high energy consumption

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