Electret melt-blown nonwovens with charge stability for high-performance PM0.3 purification under extreme environmental conditions
Electret technology is extensively utilized in fiber-based air filtration materials due to its ability to significantly enhance filtration efficiency (FE) without increasing the pressure drop. This improvement is attributed to the electrostatic attraction generated by the charges within the fibers....
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2025-08-01
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| Series: | e-Polymers |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/epoly-2025-0037 |
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| Summary: | Electret technology is extensively utilized in fiber-based air filtration materials due to its ability to significantly enhance filtration efficiency (FE) without increasing the pressure drop. This improvement is attributed to the electrostatic attraction generated by the charges within the fibers. The stability of these electrostatic charges is critical for maintaining the long-term protective performance of air filtration materials. As a result, ongoing research into electrostatic technology, influencing factors, and charge storage mechanisms remains a highly active area of study. In this study, corona-charged melt-blown nonwoven (CMN) and hydro-charged melt-blown nonwoven (HMN) were fabricated using pure polypropylene (PP) and magnesium stearate-modified PP as raw materials. The filtration performance stability of CMN and HMN was systematically evaluated under three extreme environmental challenges: continuous salt aerosol loading, high-temperature heating, and organic solvent treatment. The results reveal that HMN consistently exhibits superior FE and greater stability under all tested conditions. For instance, after heating at 130°C for 30 min, the FE of HMN decreased slightly from 99.56% to 94.19%, whereas that of CMN dropped significantly from 91.84% to 82.41%. Similarly, after complete immersion in isopropanol for 24 h, the FE of CMN and HMN declined to 37.26% and 55.91%, respectively. These findings indicate that hydro charging technology not only generates a higher charge density but also enhances charge retention, thereby improving charge stability and enabling long-term filtration performance. |
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| ISSN: | 1618-7229 |