Filtration Performance of PTFE Membrane Coated Mask

doi:10.12068/j.issn.1005-3026.2024.10.013

Abstract

Abstract:

Polytetrafluoroethylene （PTFE） membrane coated mask， as a new type of respiratory protective equipment， has received extensive attention in the field of occupational health. However， the stability of filtration performance of PTFE membrane coated mask in the high humidity environment needs to be determined. The moisture resistance of PTFE membrane coated masks is evaluated by the tests of filtration efficiency and pressure drop， and compared with nonwoven masks. The results show that the maximum reduction of the filtration efficiency of PTFE membrane coated masks is 3.20% after the high humidity environment， while the maximum reduction of nonwoven masks is only 0.44%， and there is no significant variation in the filtration pressure drop of the two types of masks during the test process. The fiber diameter （20~150 nm） and pore size （100~350 nm） of PTFE membrane are much smaller than those of nonwovens， which is mainly based on the mechanical filtration mechanism to capture particles. In high humidity environment， nonwoven with electrostatic adsorption performance is easier to achieve high filtration efficiency and low pressure drop. The results of this study provide a guidance for the rational selection of PTFE membrane coated masks.

Key words: mask, PTFE membrane, filtration performance, pore size, fiber diameter

CLC Number:

TS 174

Jing-xian LIU, Xiao-tong ZHOU, Wei-dong HE, Han-peng ZHAO. Filtration Performance of PTFE Membrane Coated Mask[J]. Journal of Northeastern University(Natural Science), 2024, 45(10): 1469-1475.

Figures/Tables 9

Table1 Basic performance parameters of masks

种类	试样编号	核心过滤层	层数	型式	口罩厚度/mm	核心过滤层参数
种类	试样编号	核心过滤层	层数	型式	口罩厚度/mm	孔径/nm	纤维直径/nm
PTFE覆膜口罩	1#	PTFE薄膜	4	平面型	0.44	313.83	87.69±45.85
	2#	PTFE薄膜	4	平面型	0.51	137.30	65.12±24.60
	3#	PTFE薄膜	4	平面型	0.49	203.14	69.60±21.76
	4#	PTFE薄膜	4	平面型	0.48	146.40	58.00±28.75
	5#	PTFE薄膜	5	立体型	0.48	153.67	43.60±10.37
医用外科口罩	6#	熔喷布	3	平面型	0.51	5 590	2 920±1 150
N95防尘口罩	7#	熔喷布	4	立体型	1.91	4 060	3 200±1 590
N95防尘口罩	8#	熔喷布	3	立体型	1.20	5 260	5 020±2 610

Fig.1 Test device of filtration performance

Table 2 The flow rate of air and oxygen required for human breathing at different labor intensities

作业等级	所需空气流量	所需氧气流量
作业等级	L·min^-1	L·min^-1
休息	6~15	0.2~0.4
轻作业	20~25	0.6~1.0
中等作业	30~40	1.2~1.6
重作业	40~60	1.8~2.4
极重作业	40~80	2.5~3.0

Fig.2 Filtration performance of masks before and after soaking at filtration air flow of 85 L·min-1

Fig.3 Filtration performance of PTFE membrane coated masks before and after soaking at filtration air flow of 50 L·min-1

Fig.4 Filtration performance of PTFE membrane coated masks before and after soaking at filtration air flow of 15 L·min-1

Fig.5 Filtration efficiency of masks before and after soaking at filtration air flow of 85 L·min-1

Fig.6 SEM images of the core filter layer of 8 kinds of masks

Fig.7 SEM images of the core filter layer of 5 kinds of PTFE membrane coated masks

References 20

1	Phan T L， Ching C T S.A reusable mask for coronavirus disease 2019（COVID-19）［J］.Archives of Medical Research，2020，51（5）：455-457.
2	Hu S， Tian H C， Zhang S J，et al.Fabrication of a high‑performance and reusable planar face mask in response to the COVID-19 pandemic［J］.Engineering，2022，9：101-110.
3	Li X Z， Gong Y.Design of polymeric nanofiber gauze mask to prevent inhaling PM 2.5 particles from haze pollution［J］.Journal of Chemistry，2015，2015：460392.
4	Wu J W， Zhou H J， Zhou J Y，et al.Meltblown fabric vs nanofiber membrane，which is better for fabricating personal protective equipments［J］.Chinese Journal of Chemical Engineering，2021，36：1-9.
5	Yao B G， Wang Y X， Ye X Y，et al.Impact of structural features on dynamic breathing resistance of healthcare face mask［J］.Science of the Total Environment，2019，689：743-753.
6	Kilic A， Shim E， Pourdeyhimi B.Electrostatic capture efficiency enhancement of polypropylene electret filters with barium titanate［J］.Aerosol Science Technology，2015，49（8）：666-673.
7	Zhao P F， Soin N， Prashanthi K，et al.Emulsion electrospinning of polytetrafluoroethylene （PTFE） nanofibrous membranes for high‑performance triboelectric nanogenerators［J］.ACS Applied Materials & Interfaces，2018，10（6）：5880-5891.
8	Mortazavi M， Fazeli A， Moghaddam S.Scalable bonding of nanofibrous polytetrafluoroethylene （PTFE） membranes on microstructures［J］.Journal of Micromechanics and Microengineering，2018，28（1）：015001.
9	Yang A K， Cai L L， Zhang R F，et al.Thermal management in nanofiber‑based face mask［J］.Nano Letters，2017，17（6）：3506-3510.
10	Xu Y Q， Zhang X M， Hao X B，et al.Micro/nanofibrous nonwovens with high filtration performance and radiative heat dissipation property for personal protective face mask［J］.Chemical Engineering Journal，2021，423：130175.
11	聂孙建，梁燕，周冠辰，等.聚四氟乙烯复合过滤材料的覆膜工艺及其性能［J］.现代纺织技术，2022，30（2）：85-92.
	Nie Sun‑jian， Liang Yan， Zhou Guan‑chen，et al.The film laminating technology and properties of PTFE composite filter materials［J］.Advanced Textile Technology，2022，30（2）：85-92.
12	朱怀球，叶翔宇，刘芙蓉.聚四氟乙烯覆膜材料用于口罩过滤材料的可行性研究［J］.现代纺织技术，2020，28（6）：1-4.
	Zhu Huai‑qiu， Ye Xiang‑yu， Liu Fu‑rong.Feasibility study of using PTFE-coated membrane as filter materials for masks［J］.Advanced Textile Technology，2020，28（6）：1-4.
13	汪泽幸，吴桂林，吴璠，等.可重复使用防护口罩的制备与性能评估［J］.棉纺织技术，2021，49（9）：71-74.
	Wang Ze‑xing， Wu Gui‑lin， Wu Fan，et al.Preparation and property evaluation of reusable protective face mask［J］.Cotton Textile Technology，2021，49（9）：71-74.
14	严杰，赵素花，陆海明，等.ePTFE纳米膜口罩可重复使用消毒测试的衰减性研究［J］.中国科技信息，2020，14：77-78.
	Yan Jie， Zhao Su‑hua， Lu Hai‑ming，et al.Attenuation study of reusable disinfection test of ePTFE nanomembrane mask［J］.China Science and Technology Information，2020，14：77-78.
15	Respiratory protective devices‑filtering half masks to protect against particles‑requirements，testing，marking：+A1：2009［S/OL］..
16	国家标准化管理委员会. 呼吸防护自吸过滤式防颗粒物呼吸器：［S］.北京：中国标准出版社，2019：12.
	Administration Standardization. Respiratory Protection-Non-powered air-purifying particle respiration：［S］.Beijing： Standards Press of China，2019：12.
17	Bui T T， Shin M K， Jee S Y，et al.Ferroelectric PVDF nanofiber membrane for high‑efficiency PM0.3 air filtration with low air flow resistance［J］.Colloids and Surfaces A：Physicochemical and Engineering Aspects，2022，640：128418.
18	Lee K S， Hasolli N， Jeon S M，et al.Filter layer structure effect on the most penetrating particle size of multilayered flat sheet filter［J］.Powder Technology，2019，344：270-277.
19	Whyte H E， Joubert A， Leclerc L，et al.Reusability of face masks：influence of washing and comparison of performance between medical face masks and community face masks［J］.Environmental Technology & Innovation，2022，28：102710.
20	肖慧明，陈钢进，张树文.溶剂溶胀对聚丙烯熔喷非织造布过滤性能的影响［J］.材料研究学报，2009，23（5）：513-517.
	Xiao Hui‑ming， Chen Gang‑jin， Zhang Shu‑wen.Influence of solvent swelling effect on filtration efficiency of melt‑blown polypropylene electret nonwoven web used as air filter［J］.Chinese Journal of Materials Research，2009，23（5）：513-517.

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