Industrial production method of base material, nano-fiber composite filter maternal, for bag filter

Abstract

The invention provides an industrial production method of a base material, nano-fiber composite filter maternal, for a bag filter. This method comprises the following steps: 1), preparing the base material: making polyester filament fiber into polyester nonwoven base material by a needling or spunlacing process, and subjecting the surface of this fiber to singeing and high-temperature calendaring to form the base material 20-30 micrometers in fiber diameter and 300-600 gsm in gram weight; 2)< preparing a spinning solution for use in a closed container; 3), combining a composite nano-fiber layer to the base material: upwardly aligning a nozzle of a high-pressure electrostatic spinning device to a surface layer of the base material, aligning the prepared spinning solution the base material for spinning to form, by disorder stacking, a PU (polyurethane) nano-fiber mesh 300-1000 nanometers in diameter in pores of the base material fiber, thus combining to form the composite filter material containing the base material fiber and nano-fiber; 4), roll-pressing the composite filter material. The base material, nano-fiber composite filter material that is efficient, low in resistance, tolerant to high temperature, tolerant to oil, resistant to hydrolysis and anti-static, can be produced industrially in batch.

Description

technical field [0001] The invention belongs to the technical field of composite filter material production, and in particular relates to an industrial production method of a base material-nanofiber composite filter material for a bag filter. Background technique [0002] In recent years, as environmental problems have attracted more and more attention from people and governments around the world, atmospheric environmental standards and atmospheric emission standards have been continuously improved. In terms of environmental standards, foreign countries have proposed PM2. limited. At the same time, due to the high price and high energy consumption of mainstream non-woven filter materials in the market, many enterprises will secretly discharge industrial exhaust gas, seriously affecting the atmospheric environment. Therefore, modern society has a great demand for air filter materials with the advantages of high efficiency, low resistance, and high cost performance. [0003]...

AI Technical Summary

Problems solved by technology

[0003] At present, the use of nanofibers in filter materials has been widely valued and researched by scientists from various countries. However, due to the problems of poor strength of nanofibers and difficulties in industrial production, the wide application of nanofibers in the industrial filtration market has not achieved major breakthroughs.

Among them, the patent US:87158301:A invented a method of covering nanofibers with a perfluorocarbon film and using an adhesive to form crosslinks between molecules, but this invention ignored the fact that the perfluorocarbon film was plated The surface energy of nanofibers is very large, the surface tension is very small, and it is difficult to have a good bonding force with the substrate supporting the nanofiber membrane; therefore, the extremely poor strength of nanofibers appears. In the process of industrial waste gas treatment, Small airflow and particles may cause the peeling and damage of the nanofiber membrane, and during the cleaning process, the nanofiber membrane is easily detached from the surface of the substrate

Patent US: 201313934401: A composite non-woven fabric of nanofibers and ultrafine fibers invented by A is impregnated with an organic solvent and then dried to form a composite nonwoven fabric. However, because nanofibers have a very large specific surface area, it is difficult to control Swelling in solvents and difficulty in avoiding damage to nanofibers during drying

The invention of patent WO2011052865A1 attaches a layer of nanofiber film on both sides of the non-woven fabric substrate, and uses hot melt adhesive to bond the nanofiber layer to the surface of the substrate, although the invention uniformly covers the nanofiber layer with hot melt adhesive The surface of the base material greatly improves the filtration efficiency and fastness of the filter material, but this invention does not substantially solve the problem of the poor strength of the nanofiber itself. damage, and the porosity of the nanofiber membrane compounded by hot melt adhesive is greatly reduced, and the air permeability decreases rapidly

Patent CN201210108716.4 invented the non-woven fabric filter material by blending nanofibers and ordinary fibers by carding and air-laid, but this invention ignores the fact that nanofibers have a large specific surface area and strong van der Waals force between nanofibers. Fibers are easy to agglomerate during reprocessing, and it is almost impossible to mix nanofibers and ordinary fibers evenly

Therefore, at present, there is no one in the patents of various countries that can effectively solve the mechanical performance requirements required for the practical application of nanofibers in industrial filtration.

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