| With the development of socialization and industrialization,the environmental pollution is increasingly serious.Air pollution has down serious harm to human health.High-temperature fibers,such us polyphenylene sulfide fiber?PPS?,polytetrafluoroethylene fiber?PTFE?,aramid fiber and glass fiber,which are always made into the core materials of industrial filters.The market shares of filter materials are mainly monopolyed and controled by foreign company.This passive situation has been broken with the invention of polysulfoneamide fiber?PSA?.PSA is a high-performance fiber and could be common used under 250 temperature,which is studyed by our country independently.With a series of advantages of Nanofibers,such us thin diameter fibers,large specific surface and small pore size,which are widely applied in the air filtration filed.So PSA nanofibers composite filter was prepared in the paper.The research on effects of PSA nanofibers spinning-process on the fiber morphology were more focused.But the influence of humidity on fiber forming-process,the influence of PSA fiber morphology and structure on filtration properties of PSA nanofibers composite filter,bond properties of PSA nanofibers composite filter has been less focused.Using PSA solution as the raw material and N,N-dimethyl acetamide?DMAc?as solvent,PSA nanofibers were prepared by electrospinning.Different structure and performance of fibrious membrane were prepared by adjusting the humidity,concentration of PSA solution and the spinning-process.PSA solution was drawn to the PSA substrate to prepare a composite filter applied in high temperature and high efficiency air filtration field inhigh voltage.The effects of hot-pressing process on filtration properties and bond properties of PSA nanofibers composite filter were explored.?1?Spinning-process of PSA nanofibers were explored Morphology and performance of PSA nanofibriou membrane were characterized by the scanning electron microscope and fibre tensile strength tester.The results showed that when humidity was less than 30%,the nanofibers were well-distributed.The PSA solution concentration and spinning-process had been optimized,when the voltage was 25 Kv and tip-collector distance was 16 cm,uniform nanofibers and well-morphology fibers were formed.?2?The structure and properties of PSA nanofibrious membrane were explored Morphology and application performance of PSA nanofibriou membrane were characterized by the scanning electron microscope,fibre tensile strength tester and filter tester.The results showed that when spinning time was more than 2 hours,the pore size of PSA membrane reached to a stable value?0.3 ?m?.The thickness of the membrane and membrane surface density would increase with the spinning time increassing,porosity sharply reduced fisrtly and then reached to a stable value 82%when spinning time was 23 hours.Spinning time and PSA solution concentration were made sure,When the spinning time was 23 hours,optimal performance of 9wt %-PSA nanofibers composite membrane was made,filtration efficiency and pressure drop of composite membrane and quality factor of nanofibrious membrane were 99.958%,792 Mpa and 9.81x10-3 respectively.?3?Filtration properties and bond properties of nanofiber composite membrane were stduded Explored the effect of the hot-pressing process and hot-pressing temperature on the fibrious membrane pore structure,the section structure and filtration properties of the 9 wt%-PSA composite membrane.The results showed that fibrious membrane porosity decreased from 82% to 69% after hot-pressing.When hot-pressing temperature was 120 ?,the filtration efficiency and pressure drop of composite membrane and the quality factor of nanofiber membrane were 99.963%,941 Mpa,8.40 × 10-3 respectively. |
PDF Full Text Request