Nano-fiber surface layer filtering material and preparation method thereof

Abstract

The invention discloses a nano-fiber surface layer filtering material which comprises a composite filtering layer and a nano-fiber layer, wherein the composite filtering layer comprises a surface layer, a base cloth layer and a bottom layer; the base cloth layer adopts a warp / weft crossed mesh structure; either the surface layer or the bottom layer adopts a mesh structure formed by disorderly tangling one or more types of fibers; the surface layer, the base cloth layer and the bottom layer are hooked together in a needling manner; the nano-fiber layer is attached onto the surface layer; the nano-fiber layer and the base cloth layer are respectively attached onto two sides of the surface layer; the nano-fiber layer comprises static spinning fibers of which the diameters are 100-200 micrometers; the static spinning fibers are made of one or more of polyphenylene sulfide, polyethylene glycol terephthalate, polytetrafluoroethylene and polyimide. Not only can the application range and occasions of the nano-fiber surface layer filtering material be expanded, but also the internal bonding strength of the nano-fiber surface layer filtering material can be improved.

Description

technical field [0001] The invention relates to a nanofiber surface layer filter material and a preparation method thereof, and belongs to the technical field of smoke filter material products and processing techniques thereof. Background technique [0002] my country is a big coal-burning country, and coal will emit a large amount of toxic gases and dust and other pollutants during the combustion process. At present, the main equipment for controlling the emission of combustion dust particles in coal-fired thermal power plants in my country has gradually changed from the simple electric precipitator in the past to the bag filter or the electric bag composite filter with the filter bag as the core, so as to meet the requirements of ultra-low emissions. However, with the further improvement of the national environmental protection standards for dust emission concentration requirements, the dust removal efficiency of the bag filter also needs to be further improved. Controlli...

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Problems solved by technology

The glass fiber filter material mentioned in Chinese patent document CN101721855A only involves glass fiber filter paper, but in fact, on the one hand, glass fiber filter paper has a limited scope of application due to its own structural shortcomings, specifically: it is not suitable for loading desulfurization and destocking and other catalysts, glass fiber filter paper is difficult to apply to high-pressure filtration occasions due to insufficient toughness; The bonding strength between fiber filter paper and nanofibers is poor, which makes it difficult to popularize nanofiber surface filter materials in practical applications

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