Electret non-woven filter material for air filtering

Abstract

The invention discloses an electret non-woven filter material for air filtering.An evenly-distributed three-dimensional spatial network structure is formed by 0.06D PET superfine fibers and 30D PE / PET skin core complex fibers, linkage joints are formed by the skin core complex fibers and the fibers in contact with the skin core complex fibers, and PTFE coatings are arranged on the surfaces of the superfine fibers and the skin core complex fibers.A preparation method of the electret non-woven filter material comprises the steps that the PET / PET figured sea-island staple fibers and the PE / PET skin core complex short fibers are mixed according to a certain mass ratio and carded, and the electret non-woven filter material is formed through needling net forming, alkali liquor melting, roll compacting and washing, PTFE emulsion dipping, tentering heat shaping and cooling curing.The electret non-woven filter material has the advantages of being high in strength, stable in size and small in resistance.The filter material is high in porosity, small and even in aperture and good in breathability.The electron work function is high, the dielectric constant is small, and the static adsorption effect on PM2.5 dust is good.Super-hydrophobic performance is achieved, and the static adsorption function of the filter material cannot be weakened by damp air.

Description

technical field [0001] The invention relates to the field of materials, in particular to an electret nonwoven filter material for air filtration. Background technique [0002] People are increasingly concerned about the PM2.5 (fine particulate matter with a particle size below 2.5 microns) index in the air. PM2.5 mainly comes from the residues discharged during industrial production and automobile exhaust emissions. Most of them contain toxic substances such as heavy metals. After being inhaled into the human body, they will directly enter the bronchi, interfere with the gas exchange in the lungs, and cause asthma, bronchitis and diseases such as cardiovascular disease. In addition, pollen and other floating particles in the air with a particle size of about 20-40 μm are also the main source of inhaled allergens, which can easily lead to allergic diseases, such as itchy nose, itchy skin, itchy eyes, wheezing and coughing and other allergic symptoms. How to remove these dus...

AI Technical Summary

Problems solved by technology

[0005] The use of electrostatic force to capture dust particles has the advantages of high filtration efficiency, low resistance and antibacterial. Air filter materials often use electret fibers to achieve the purpose of electrostatic adsorption of dust. However, conventional electret methods such as corona discharge method, thermal Polarization method, low-energy electron beam bombardment method and other processes are complicated and costly

Chinese published patent CN203862028 discloses a high-performance polyester filter material. The filter material is impregnated with PTFE emulsion, and utilizes the erosion resistance and filter dust removal properties of PTFE. Polyester filament and stainless steel yarn are blended to eliminate static electricity and obtain antistatic polyester filter material, which cannot achieve the purpose of electrostatic adsorption of dust

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