Fabrication Of Composite Nanofibrous Membrane With High Filtration Performance Via Electrospinning

Research of high quality air filter materials has received extensive attention as micro/nanoparticle dust pollution been getting worse in recent years.Electrospun nanofiber membranes have the advantages of small diameter,high porosity,large specific surface area,and easy to compound,which has become a promising candidate of fiber filter with high filtration efficiency and low fluid resistance.This paper mainly focused on precise forming regulation of three-dimensional composite nanofiber membranes and their air filtration mechanism.And the electrospinning law of the functional composite nanofiber filter membranes and optimization of antibacterial properties of nanofiber filters were explored.A numerical simulation model was built based on the aerodynamic behaviors of nanofiber membrane filtration.The effect of the structure parameters on the internal airflow static pressure,airflow velocity and particle trapping efficiency was analyzed.Simulation results showed that by increasing the fiber diameter and thickness,and by decreasing the pitch of the helical three-dimensional structure,the particle trapping efficiency was improved.Also the air resistance was increased.Three-dimensional nanofiber was electrospun and its filtration ability were tested.Spiral fiber structures were fabricated rapidly by optimizing the electrospinning process.The control law of air filtration performance of three-dimensional nanofiber membrane was tested and analyzed.Experimental results found that the quality factor of the optimized electrospun nanofiber membrane with spiral solid structure can reach 0.0309Pa-1.The three-dimensional forming process of PVDF/PAN composite nanofiber was optimized,and rapid manufacture of composite nanofibers membrane was achieved.The filtration performance of the electrospun nanofiber membrane was tested and analyzed.The regulation of the filtration performance of composite nanofiber membrane was obtained.The effects of nanofiber membrane compositing method,ratio of different materials on the filtration efficiency and filtration resistance of nanofiber membrane were studied.The filtration efficiency was promoted by increasing the proportion of PAN fibers in the composite nanofibers,while the air flow resistance was also increased.Compared to the composite fiber membranes made by hybrid spinning,the laminated composite nanofiber membrane is conducive to the reduce of air flow resistance,where the air filter pressure drop can be reduced to 78.8 Pa and the filtration quality factor can be increased to 0.0398 Pa-1.N,N-Dimethylaminoethyl Methacrylate(PDMAEMA)antibacterial material was added to PVDF/PAN composite fiber membrane.And the manufacturing process of composite fiber membrane with antibacterial function was explored.When the concentration of antibacterial agent was 3.0wt%,an optimal antibacterial property of the composite nanofiber membrane was achieved,where an antibacterial rate of up to 88.4%.In this paper,electrospinning of three-dimensional composite nanofiber membranes with antibacterial function was studied.The electrospinning process and the optimization of the structural parameters of the three-dimensional membranes were investigated to improve the filtration performance,which was conducive to the industrialization of composite fiber filter media.