Preparation Of Sepiolite/PPS Composite Material And Numerical Simulation Of Its Filtration Performance

China's high energy-consuming enterprises were developed rapidly.Meanwhile it also bring the high temperature soot,which not only contains harmful toxic substances,but leads to increased air pollution and haze phenomena.Governance work for atmospheric dust pollution has promoted the bag dust industry expand rapidly.As the filter bag is the core component of a bag filter,to study the performance of filter material in the filter bag seems particularly important.Due to the good comprehensive performance of polyphenylene sulfide fibre,it becomes one of the most widely used filter materials for bag filters.Its operating temperature is about 180 ?,but much smoke dust discharged during industrial production is at200 ? or even higher.Therefore,research on improvement of thermostability of polyphenylene sulfide fibre has important practical significance.In recent years,it has become a hot topic in this field that by adding filler to enhance the thermal stability of polyphenylene sulfide effectively.In this paper,polyphenylene sulfide was the main raw material and its resistance to elevated temperatures was improved through addition of modified sepiolite and antioxygen.They were melt blended by using a twin screw extruder and polyphenylene sulfide composites with better resistance to elevated temperatures were prepared successfully.During experiments,structural characteristics and surface properties of raw and modifid sepiolite were studied.Through characterization means,such as XRD,SEM,FTIR and DSC,polyphenylene sulfide with fillings was explored and analyzed to further understand the performance of modified polyphenylene sulfide material.Based on this,fibre filtering medium models before and after modification of polyphenylene sulfide were established and the CFD-DPM method was applied to conduct numerical simulation of its performance,leading to the following conclusions:(1)Structural characteristics and surface properties of raw and modifid sepiolite were investigated by X-ray diffraction(XRD),infrared spectrometer(FTIR),scanning electron microscopy(SEM)and so on.The research results showed that compared with unmodified sepiolite,both purity and porosity of modified sepiolite were enhanced and after organic modification,the sepiolite clay showed better stability,lipophilicity and dispersion property,where pores inside sepiolite were opened without structure damage of initial crystals.(2)The sepiolite / polyphenylene sulfide composite was successfully prepared by The twin screw extruder.Results of differential thermal analysis(DSC)indicated: for the composite of polyphenylene sulfide with addition of 2 wt% of organical sepiolite and 0.1 wt% of 1098 antioxidant,its initial decomposition temperature was enhanced by 27?.The structure and property effects of polyphenylene sulfide which added filler were studied by scanning electron microscopy(SEM),infrared spectrometer(FTIR),X-ray diffraction(XRD)and so on.The results showed: in the polyphenylene sulfide matrix,organic sepiolite is of nanometer-and-micron-sized dispersion without agglomeration and showed good binding ability with the interface of polyphenylene sulfide and there's no impact on the initial structure of polyphenylene sulfide.(3)This paper conducted numerical simulation of CFD-DPM gas-solid two-phase flows for the interior of seven established fibre filtering medium models.At the dust filtration stage,with the increased head-on velocity,the pressure loss of fibre filtering medium models also increased,but there is few effects of filtration velocity on the filtration efficiency.When the particle diameter was greater than 5?m,the collection efficiency of fiber models was close to 99.99%.Thus,it can be seen that the filtration efficiency and pressure differences of polyphenylene sulfide with addition of a small amount of fillings and pure polyphenylene sulfide were similar;a small amount of fillings showed no great influence on the filtration performance of fibres;to improve the resistance to elevated temperature by addition of organic sepiolite is feasible;and simulation results provided the theoretical basis for sepiolite/polyphenylene sulfide composite fiber material.