双层聚四氟乙烯泡沫涂层滤料的制备及性能OA

In order to solve the problem of tiny particulate pollution of industrial flue gas and to develop highly efficient filter materials with low resistance,polytetrafluoroethylene(PTFE)emulsion was taken as the main raw material of the coating agent and the layered coating method was adopted to prepare double-layer foam coated filter media containing an inner polyvinyl alcohol(PVA)@PTFE layer and an outer PTFE layer on poly-phenylene sulfide(PPS)needled felts.Four samples with different thickness ratios of the inner and outer layers were designed,and their physical properties,air permeability,pore size distribution and filtration properties were tested.The results showed that when the thickness ratio of the inner and outer layers was 7∶3,the filter media had the best overall performance,with 99.6%filtration efficiency for PM1.0,pressure drop of only 206 Pa,water contact angle of 134.99° and fracture strength of 1348.79 N.The double-layer structure reduced the average pore size and distributed more uniformly,forming a dense three-dimensional gradient pore structure.The inner layer enhanced the retention capacity of small particles,and the outer layer improved the hydrophobicity and de-creased the resistance,which synergistically achieved a balance between high efficiency capture and low resist-ance.The filter media has good application potential in the treatment of fine particles in industrial flue gas.