Abstract: The basalt/PPS fkber composite filters were prepared by opening, carding and needling using 70% basalt fibers (BF) and 30% polyphenylene sulfide (PPS) fibers. Then, the composite filters wereprocessed with polytetrafouorothylene (PTFE) emulsions with different concentrations (ranging from 6% to 14%). The morphology, mechanical properties, pore size distribution and filtration performance weretested by a scanning electron microscope (SEM), a strength tester, an aperture tester, and a comprehensive performance tester. The results showed that the gaps between the fibers were gradually reduced and the mean pore size decreased from 30.4 μm to 23.7 μm with increasing of comcentrations of PTFE emulsions. While ensuring certain strength and filtration resistance, the filtration efficiencys significantly improved from 89.99% to 98.36%.

Key words: basalt/PPS filters, PTFE emulsion, pore size, filterability