| Melt electrospinning technology because of its extensive sources, high productivity and without solvent, has became the most promising applicable perfine fiber green manufacturing process of the 21st century. Melt electrospinning technology failed to realize industrialization due to the limit of spinning process and devices, which limits the applied research of melt electrospinning fiber membrane in the related field. Therefore, this article is commited to accelerate the pave of melt electrospinning fiber membrane in the field of air filtering, based on melt differential electrospinning method, futhering improve the efficiency and homogeneity, promote fiber refining, and through the research of air filtering process with fiber membranes as well as the development of related devices, concrete content is as follows:(1)Improving fiber production by increasing the number of spinning nozzles, set up melt differential electrospinning device with four nozzles. From the perspective of nozzle flow, designing the single shunt board with one to four cross average flow, feed quantity between the respective nozzle does not exceed 14%, impaction on the average of fiber diameter less than 8%. From the perspective of electric field distribution, improves the connection mode of nozzle and shunt board, using Ansys Workbench to probe the three dimensional electric field of spinning area with device before improving and after, when shunt board and nozzle uses integrated connection, effectively enhance the electric field distribution homoge-neity.(2) Promoting fiber refining by researching spinning process, this article put supercritical carbon dioxide (SCCO2) into polypropylene (PP) by sealed pressure vessel to get the gas-solid homogeneous system, base on melt differential electrospinning device, the fiber of PP and SCCO2 homogeneous system is manufactured. Then explore the effect of holding time, holding pressure and watering temperature on the viscosity of polymer and melt differential electrospinning fiber respectively. Studies had shown that supercritical gas can lower the fiber diameter, which improves the filtration efficiency of fiber membrane.(3) Studying the effect of multi-layer fiber membrane and its diff-erent combinations on filtration performance. Based on the archetype of fiber membrane manufactured by melt differential electrospinning device, establishing a random two-dimensional fiber model, and use the Fluent to simulate the flow field of fiber membrane filtering, compared with the experimental results, it is concluded that in the multi-layer fiber membrane the thinner layers placed in the intake side and the coarser fibre layers placed on the leeward side is helpful to improve the membrane filtration performance.(4) Based on the excellent filtration performance of melt differential electrospinning fiber, independent research the vehicle air filtering device and computer case with air filtration. The air filtration performance of device had been tested, vehicle air filtering device running 30min later, the concentration of PM2.5 decreased 44.3%. |
