聚四氟乙烯(PTFE)乳液浸渍涂层对聚苯硫醚(PPS)针刺毡过滤性能和热性能的影响

IF 2.3 4区 材料科学 Q2 Chemistry
Chao Lv, Ruiqing Shen, Yang Yang, Rui Shu, Guodong Li, Jingxian Liu
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引用次数: 0

摘要

聚四氟乙烯(PTFE)乳液由于其优异的化学稳定性和良好的力学性能,在聚苯硫醚(PPS)针毡浸渍工艺中被广泛用作涂层材料。然而,乳化浸渍涂层对针刺毡过滤性能的影响仍存在争议。此外,在高温工业应用中,针刺毡的热稳定性直接影响其使用寿命,但聚四氟乙烯乳液浸渍后处理后PPS针刺毡的热解和动力学性能的定量研究很少。采用直接浸渍法制备了PPS纤维/聚四氟乙烯乳液(PPS/PTFE)复合针刺毡。综合评价了PPS针刺毡和PPS/PTFE复合针刺毡的压降特性和机械收集效率。结果表明,PTFE乳液浸渍涂层不仅增大了压降,而且降低了收集效率。更具体地说,对于粒径小于2.5 μm的颗粒,随着粒径的减小,收集效率的衰减量进一步增大,但PPS/PTFE复合针刺毡对粒径较大的颗粒的机械收集效率与PPS针刺毡基本相同。推导了三种乳液浸渍涂层分布模型,系统地解释了这一实验现象。此外,还分析了PPS针刺毡和PPS/PTFE复合针刺毡的热降解过程,并从理论上确定了几种典型的热解动力学参数。结果表明,聚四氟乙烯乳液浸渍涂层能提高PPS针毡的热稳定性。本研究为直接浸渍工艺及乳液浸渍涂料在工业过滤领域的合理应用提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt

Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt

Polytetrafluoroethylene (PTFE) emulsion is widely used as a coating material in the impregnation process for preparing polyphenylene sulfide (PPS) needle felts due to its excellent chemical stability and good mechanical properties. However, the effect of emulsion impregnation coating on the filtration performance of needle felts is still under debate. Moreover, in industrial applications with high temperatures, the service life of needle felts is directly affected by their thermal stability, but the pyrolysis and kinetic properties of PPS needle felt after PTFE emulsion impregnation post-processing have rarely been quantitatively investigated. In this study, the PPS fiber/PTFE emulsion (PPS/PTFE) composite needle felt was fabricated by a direct impregnation process. The pressure drop characteristic and mechanical collection efficiency of PPS needle felt and PPS/PTFE composite needle felt were comprehensively evaluated. It was found that the PTFE emulsion impregnation coating not only increases the pressure drop, but also decreases the collection efficiency. More specifically, for particles having a size below 2.5 μm, the decrement of collection efficiency further increases with the decrease of particle size, but the mechanical collection efficiency of PPS/PTFE composite needle felt for particles having larger size is almost the same as that of PPS needle felt. Three emulsion impregnation coating distribution models were inferred to systematically explain this experimental phenomenon. Additionally, the thermal degradation process of PPS needle felt and PPS/PTFE composite needle felt was analyzed, and several typical pyrolysis kinetic parameters were also determined theoretically. It was confirmed that the PTFE emulsion impregnation coatings can enhance the thermal stability of PPS needle felts. This work provides new insight into the rational application of the direct impregnation process as well as emulsion impregnation coating in the industrial filtration field.

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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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