Air filtering medium and preparation method

Abstract

The invention provides an air filtering medium. The air filtering medium comprises base cloth and a barrier layer which is located on the base cloth; the barrier layer comprises at least one layer ofcellular structure; and the cellular structure is formed by adding electret masterbatch in a waterborne polyurethane system containing a foaming agent for foaming, and at least part of cells communicate with each other. Due to adding of the electret masterbatch, the cellular structure has certain electrostatic adsorbing performance. Under the double effects of mechanical blocking and electrostaticadsorbing, the particle obstructing efficiency of the filtering medium is better. The filtering medium is high in obstructing efficiency, simple in preparation process and used for masks, and the problem that due to the insufficiency of the melt-blown fabric productivity, the masks are in shortage is solved.

Description

technical field [0001] The invention relates to the technical field of masks, in particular to an air filter medium and a preparation method. Background technique [0002] The filter layer in the middle of the traditional mask is melt-blown cloth. The melt-blown cloth uses high-speed hot air flow to draw the fine flow of polymer melt extruded from the spinneret hole of the die, thereby forming ultra-fine fibers and collecting them in the condensation net. On the curtain or roller, at the same time, it is bonded to itself to become a melt-blown nonwoven fabric. Melt blown cloth has good filterability, barrier property, heat preservation and adsorption properties. It is an important material for filtering pathogenic microorganisms, body fluids and particulate matter. However, its preparation process is complicated, with high technical content, high investment cost and low output value. Especially after the outbreak of the coronavirus, the demand for masks has increased sharpl...

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Problems solved by technology

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an air filter medium and a preparation method, which can replace the melt-blown cloth used in the mask to solve the problems in the prior art due to the preparation of the melt-blown cloth. Due to complex process and limited production capacity, masks cannot meet market demand

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