Polylactic Acid Meltblown Nonwovens with High Filterability and Low Charge Decay: A Commercially Viable Strategy for Liquid Electret Charging Solutions,Industrial & Engineering Chemistry Research

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Polylactic Acid Meltblown Nonwovens with High Filterability and Low Charge Decay: A Commercially Viable Strategy for Liquid Electret Charging Solutions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-07-16 , DOI: 10.1021/acs.iecr.4c01438
Yujing Zhang , Jinxing Wang , Shengchao Yuan , Munir Hussain , Xiangyu Ye ₁ , Yan Fang ₂ , Bin Yu , Feichao Zhu

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Polylactic acid (PLA) meltblown nonwovens are highly desirable alternatives to existing polypropylene air filtration materials, owing to their durability throughout their operational lifespan and biodegradable nature upon disposal. However, the practical utilization of PLA meltblown nonwovens remains challenged by the dual objectives of enhancing filtration performance and maintaining long-term stable charge storage. Herein, we implemented a commercially viable solution process for liquid electret charging, aiming to enhance the filtration efficiency (>95%) and charge stability (>1 year) of PLA meltblown nonwovens. In this process, the space charge is transferred from the liquid electret to the surface of PLA meltblown nonwovens to be polarized, and then the stable charges inside PLA fibers are formed by aging process. The resulting liquid electret charging PLA meltblown nonwovens showed an enhanced salt filtration efficiency of 99.5% and an oil filtration efficiency of 96.1%. The charge density and thermally stimulated discharge (TSD) measurements indicate that PLA meltblown nonwovens exhibit stable and abundant charge-carrying capabilities. A plausible charge generation and storage mechanism has been proposed. Moreover, evaluating the durability of these nonwovens is crucial for broadening their applications and addressing environmental and energy challenges.

中文翻译：

具有高过滤性和低电荷衰减的聚乳酸熔喷非织造布：液体驻极体充电解决方案的商业可行策略

聚乳酸（PLA）熔喷非织造布是现有聚丙烯空气过滤材料的非常理想的替代品，因为它们在整个使用寿命期间具有耐用性，并且在处置时可生物降解。然而，PLA熔喷非织造布的实际应用仍然面临增强过滤性能和保持长期稳定电荷存储的双重目标的挑战。在此，我们实施了一种商业上可行的液体驻极体充电解决方案，旨在提高PLA熔喷非织造布的过滤效率（> 95％）和电荷稳定性（> 1年）。在此过程中，空间电荷从液体驻极体转移到PLA熔喷非织造布表面进行极化，然后通过老化过程在PLA纤维内部形成稳定的电荷。所得液体驻极体充电PLA熔喷非织造布的盐过滤效率提高至99.5%，油过滤效率提高至96.1%。电荷密度和热刺激放电（TSD）测量表明PLA熔喷非织造布表现出稳定且丰富的电荷携带能力。已经提出了一种合理的电荷产生和存储机制。此外，评估这些非织造布的耐用性对于扩大其应用以及应对环境和能源挑战至关重要。

更新日期：2024-07-16

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