Research on the Filtration Performance of Two Kinds of PTFE Modified Filter Media

Abstract

With the improvement of environmental standards, fine particle control technology has put forward a severe test. Lamination and impregnation which are two main methods for PTFE modified filter materials at present were studied in this research. By comparing the SEM result, classification efficiency of two modification methods, the influence rules of humidity and corrosive environments, filter performance was investigated. Research indicates that two modification methods have different improvements in filter materials filter performance. Filter material after lamination porosity is high and pore size is small, the average pole diameter is around 2.3μm which is 1/10 of that after impregnation, so surface filtering is easily formed. The laminated filter material can effectively withhold the yardstick of microscopic dust micron. Attachments on the surface of composite filter material fiber noticeably increased, surface density and thickness of composite filter material all increased slightly after emulsion impregnation treatment which can increase the filter material strength under normal conditions. The pressure loss of lamination filter material is higher than that of impregnation filter material. Lamination filter material has higher filtering classification efficiency for fine particles. Impregnation is conducive to enhance the strength of the filter. Two kinds of modified filter materials have good resistance to acids, but break in 85°C and alkali conditions, strength retention disappears entirely. The study provided a reference for the stable and efficient application of modified filter material in the dust removal field.