ZIFs改性聚丙烯熔喷空气过滤材料的制备及其性能研究

Preparation and Properties of Zeolitic Imidazolate Framework Modified Polypropylene Melt-blown Air Filter Materials

高效空气过滤材料的开发对于空气污染治理具有重要意义.然传统熔喷空气过滤材料过滤性能稳定性差,限制了其应用.本文以PP熔喷空气过滤材料为基体,通过原位生长的方式在其表面构筑类沸石咪唑酯骨架结构材料(ZIF-L)功能层,制备具有微/纳结构的PP/ZIF-L熔喷过滤材料.ZIF-L的原位生长可以有效调控PP熔喷非织造材料结构和性能,进而有效解决PP熔喷空气过滤材料过滤稳定性差、不可重复利用的缺点.通过多种表征手段和测试方法研究了ZIF-L的原位生长对PP熔喷空气过滤材料结构和性能的影响.结果表明,ZIF-L的原位生长可有效提升PP熔喷空气过滤材料的过滤性能,其对PM2.5的过滤效果可从55.2%提升至93.2%.此外,PP/ZIF-L熔喷空气过滤材料具有优异的可重复使用性,经过75%医用酒精消毒后,过滤效率基本不变,依然保持在92.4%,并且在不同颗粒物大小,不同颗粒物浓度,不同风速和长时间使用等条件下依然保持优异过滤性能.所制备PP/ZIF-L熔喷空气过滤材料在空气过滤领域具有广阔的应用前景,可为高性能PP熔喷非织造滤料的制备提供一定参考.

Recently,the problem of air pollution has become more and more serious.The preparation of high-efficiency air filter materials(AFMs)is of great significance in solving the air pollution problem.In this study,the micro/nanostructured PP/ZIF-L melt-blown AFMs were prepared via in situ growth method with the PP melt-blown AFMs as the matrix.The in situ growth of ZIF-L can effectively regulate the structure and properties of PP melt-blown AFMs,and thus solve the shortcomings of PP melt-blown AFMs with poor filtration stability and non-reusability.The effects of in situ growth of ZIF-L on the structure and properties of PP melt-blown AFMs were investigated by various methods.The results showed that the in situ growth of ZIF-L can effectively improve the filtration performance of PP melt-blown AFMs.The filtration efficiency of PM2.5 increased from 55.2%to 93.2%after the growth of ZIF-L on PP melt-blown AFMs’surface.Moreover,the PP/ZIF-L melt-blown AFMs had excellent reusability.The PP/ZIF-L melt-blown AFMs still showed a higher filtration efficiency(92.4%)after washing with 75%alcohol,while that of the commercial PP melt-blown AFMs was only 56.8%.The PP/ZIF-L melt-blown AFMs showed a broad application prospect in the field of air filtration and can provide a certain reference for the preparation of high-performance PP melt-blown AFMs.