Air filtering medium and preparation method

Abstract

The present invention provides an air filtering medium and a preparation method. The air filtering medium comprises base cloth and a barrier layer, the barrier layer comprises at least one layer of foam structure, the foam structures are formed by adding electret masterbatches into a waterborne polyurethane system and performing foaming and wet solidification, and at least part of foams communicate. A foaming layer is solidified by coagulation liquid, waterborne polyurethane is solidified by demulsifying, the foams are fixed, moisture is evaporated by heating, and the dense foams are left to be compounded with the base cloth to form the air filtering medium. The air filtering medium disclosed by the invention is high in particle blocking rate, the preparation method is simple, and the airfiltering medium replaces a melt-blown fabric to be applied in the field of masks, so that the problem of short supply of the masks 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, and is an important material for filtering pathogenic microorganisms, body fluids, and particulate matter. However, the preparation process of melt-blown cloth 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 i...

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an air filter medium and a preparation method. This air filter medium has good barrier properties and can be used on masks instead of melt-blown cloth to solve the problems in the prior art. Due to the complex preparation process and limited production capacity of the melt-blown cloth filter layer, the mask cannot meet the market demand

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