Research on Loading Filtration Performances of Electret Polypropylene Melt Blown Nonwovens
The filtration performances of electret materials will change during the continuous use. In order to investigate the mechanism, the filtration performances of electret materials are tested under various loading conditions. The polypropylene melt blown nonwovens of electret materials are prepared by...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Department of Journal of Nantong University (Natural Science Edition)
2020-09-01
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| Series: | Nantong Daxue xuebao. Ziran kexue ban |
| Subjects: | |
| Online Access: | https://ngzke.cbpt.cnki.net/portal/journal/portal/client/paper/eda6116da232475b96f5d096f4ef5ec6 |
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| Summary: | The filtration performances of electret materials will change during the continuous use. In order to investigate the mechanism, the filtration performances of electret materials are tested under various loading conditions. The polypropylene melt blown nonwovens of electret materials are prepared by the melt blown and corona charging technologies, and the influences of loading time, material characteristics and aerosol flow rate on the loading filtration efficiency and pressure drop are tested by the TSI8130. The SEM method is used to evaluate the surface morphology of the electret melt blown nonwovens after loading different time, and the filtration mechanism is further analyzed. The results reveal that the efficiency of electret melt-blown nonwoven initially presents a decreasing trend, and reaches the lowest value of 98.04% after 8 minutes, followed by an increase and reaches a constant value after loading 29 minutes.Meanwhile, the pressure drop increases gradually. The main reason for this is the electrostatic attraction plays an important role at the initial stage, and the charges on the electret material are neutralized by the captured particles, which results in the filtration efficiency decrease. As more and more particles are accumulated, the mechanical filtration is enhanced and it results in the filtration efficiency increase. In addition, the material characteristics and aerosol flow rate will also affect the loading filtration performances |
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| ISSN: | 1673-2340 |