A high-efficiency and low-resistance electrospun nanofiber air filter material and its batch preparation method

Abstract

The invention relates to an efficient and low-resistance electrospun nanofiber air filter material and a batch preparation method. The filter material is of a sandwich structure formed by alternately arraying spun-bonded nonwovens and nanofibers; by the adoption of a pinfree type electrostatic spinning nozzle and by an electrostatic spinning and electrostatic spraying synchronous combination technology, a nanofiber / microsphere composite film is prepared; a revolving rotary drum is used as a receiving device, and the spun-bonded nonwoven is used as a receiving matrix, so that a nanofiber / nonwoven composite material is obtained; a layer of spun-bonded nonwoven covers the surface of the nanofiber / nonwoven composite material to form the sandwich structure with the spun-bonded nonwovens and the nanofibers which are alternately arrayed; the sandwich structure is bonded to obtain the efficient and low-resistance electrospun nanofiber air filter material. The preparation process is simple, and high in controllability and repetitiveness, and the prepared air filter material has the characteristics of high efficiency and low resistance, and is uniform in thickness and stable in filter performance; batch production of the nanofiber filter material can be realized; the efficient and low-resistance electrospun nanofiber air filter material has very good application prospect in the field of air filtering.

Description

technical field [0001] The invention belongs to the field of air filter materials and preparation thereof, in particular to a high-efficiency and low-resistance electrospun nanofiber air filter material and a batch preparation method. Background technique [0002] With the deepening of my country's industrialization process and rapid economic development, the problem of air pollution is becoming more and more serious, especially in recent years, the PM2.5 (particles with a particle size less than 2.5 μm) pollution that has continued to appear in various parts of our country has caused serious threats to people's health. . Filtration as a protective measure can effectively resist the adverse effects of pollution on people. At present, my country's industry uses a large number of air filter materials based on glass fiber or melt-blown non-woven fabrics, which have a good filtering effect on particles above the micron level, but poor filtration efficiency on sub-micron or even ...

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Problems solved by technology

However, the mechanical properties of porous fiber materials are poor, and the rapid volatilization of a large number of low-boiling solvents during the experiment will endanger people's health.

(3) For nanofiber membrane electret, the patent CN104289042A discloses "an electrospun nanofiber electret filter material and its preparation" and prepared nano Fibrous electret filter material, but does not give relevant data on whether the surface charge of the material will dissipate after long-term storage

During the storage and use of electret materials, moisture and particles in the air will accelerate the dissipation of charge on the surface of electret materials, which will gradually attenuate the electret effect and eventually lead to a decrease in the filtration efficiency of the materials.

The low output of electrospun nanofiber materials has always been a technical difficulty restricting its industrial production. The above methods and patents have not solved the problem that electrospun nanofiber filter materials cannot be produced in batches.

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