At present, melt blown nonwoven fabric are widely used in the field of filtration materials.Since the 1970s, a variety of charging technologies and unique filters with electrostatic charges by mixing different fibers have been developed and utilized.The immediate result is the current electrostatic electret method.The main electret methods at present include electrostatic spinning, corona charging, friction electrification, thermal polarization and low energy electron beam bombardment.Due to different electrostatic electret methods (processes) of materials, the properties of electret bodies formed are also quite different.
In fact, the filtration performance of meltblown nonwoven is only less than 70%, and it is not enough to rely solely on the mechanical blocking effect of the three-dimensional aggregation of ultrafine fibers with fine fibers, small voids and high porosity.Otherwise, simply increasing the material gram weight thickness will greatly increase the filtration resistance.Therefore, melting spray filter materials generally add electrostatic charge effect to melting spray cloth through electrostatic electing process. The filtration efficiency can reach 99.9% to 99.99% by using electrostatic method.KN95 standard.
Electret air filter material USES the polarity of the fiber itself to adsorb dust electrostatic and capture bacteria and viruses.The high porosity and open electrostatic electret properties of ultrafine fibers are used to provide high efficiency and low resistance filtration quality.In extremely antibacterial mechanism of action is electret melt-blown cloth stimulate a strong electrostatic field and microelectronics flow of bacteria, make its protein and nucleic acid mutation damage, destroy the bacteria of surface structure, killing bacteria, release negative ions tourmaline itself blocked some bacteria microbial metabolic processes, including the respiratory system, the activity of the enzyme, mass transfer from the cell wall, thus inhibiting bacterial cells have antibacterial effect.
The melting - jet electret filter materials capture particles mainly through the dual action of mechanical barrier and electrostatic adsorption.Mechanical resistance is closely related to the structure and properties of materials: when the molten spraying cloth is charged by corona with a voltage of several hundred to several kilovolts, the fibers diffuse into a network of holes due to electrostatic repulsion, and the size between the fibers is much larger than the size of dust, thus forming an open structure.When the dust passes through the molten jet filter material, electrostatic effect can not only attract charged dust particles effectively, but also capture polarized neutral particles by electrostatic induction effect.The higher the electrostatic potential of the material, the higher the charge density of the material, the more point charge, the stronger the electrostatic effect.Corona discharge can greatly improve the filtration performance of polypropylene melting - spraying cloth.The addition of tourmaline particles can effectively improve the electret efficiency, increase the filtration efficiency, reduce the filtration resistance, increase the surface charge density of the fiber, and enhance the storage capacity of the fiber net.The comprehensive effect is better when 6% tourmaline electret is added.Too much electret material will instead increase carrier movement neutralization.
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Post time: Sep-21-2020