Chemical Industry and Engineering Progress ›› 2022, Vol. 41 ›› Issue (2): 911-919.DOI: 10.16085/j.issn.1000-6613.2021-0516

• Materials science and technology • Previous Articles     Next Articles

Polyvinyl alcohol (PVA) based ternary mixed matrix total heat exchange membranes (THEM) comprising montmorillonite (MMT) and CaCl2: preparation and characterization

CHANG Xian1(), YANG Wenjie1, LI Shiyang1, ZHANG Xiumin1, WU Tao2, XUE Lixin1,2()   

  1. 1.Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    2.Colaborative Imovation Center for Membrane Separation and Water Treatmert of Zhejiang University of Technology Huzhou Institute, Huzhou 313000, Zhejiang, China
  • Received:2021-03-15 Revised:2021-06-10 Online:2022-02-23 Published:2022-02-05
  • Contact: XUE Lixin

聚乙烯醇基高透湿高阻隔三元混合基质全热交换膜制备和性能

苌现1(), 杨文杰1, 李士洋1, 张秀敏1, 吴涛2, 薛立新1,2()   

  1. 1.浙江工业大学化工学院膜分离与水科学技术中心,浙江 杭州 310014
    2.浙江工业大学膜分离与水处理协同 创新中心湖州研究院,浙江 湖州 313000
  • 通讯作者: 薛立新
  • 作者简介:苌现(1992—),男,硕士研究生,研究方向为膜科学与技术。E-mail:1093304586@qq.com
  • 基金资助:
    国家自然科学基金(21975222);湖州市科技项目(2019ZD2035)

Abstract:

The feasibility of breaking the trade-off between the heat exchange ratio and waste gas barrier property of polyvinyl alcohol (PVA) based total heat exchange membranes were investigated using montmorillonite (MMT) and CaCl2 as co-additives. The morphology, water contact angle, thermal stability, mechanical properties, gas transmission permeability and total heat exchange efficiency of the ternary hybrid matrix membranes developed from solution-cast method were investigated at varied content of CaCl2 and MMT. It was observed that addition of suitable amount of CaCl2 hybrid can be introduced into the water conduction channel to improve the water vapor permeability and enthalpy exchange efficiency of the membrane. The addition of suitable amount of MMT could improve not only CO2 gas barrier property, but also surface roughness, thermal stability and mechanical properties of the THEM. However, excess MMT or CaCl2 content had both shown negative effects. Considering the requirements of low CO2 gas transmission permeability, good water vapor and heat exchange efficiency and mechanical properties, the hybrid matrix membranes with the mass ratio of PVA∶CaCl2∶MMT of 8∶1.6∶0.8 was most likely to be used as total heat exchange membranes with improved performance in energy-saving ventilation systems.

Key words: polyvinyl alcohol, calcium chloride, montmorillonite, moisture permeable, gas barrier, total heat exchange efficiency

摘要:

探讨了通过蒙脱土(MMT)和无水氯化钙(CaCl2)共混掺杂改性,来打破透湿和阻气性之间的博弈 (trade-off)效应,全面提升聚乙烯醇(PVA)全热交换膜性能的可行性。本文系统研究了氯化钙和蒙脱土的含量对膜的形态、接触角、热稳定性、力学性能、气体透过率和总换热效率的影响。实验数据表明,适量氯化钙的杂化可以引入水传导通道,提升膜的水蒸气透过率和焓交换效率,适量蒙脱土掺杂可以提升膜的高CO2气体阻隔性能、改善其热稳定性和机械性能,同时提升粗糙度、提高湿度和焓交换效率;但是当无水氯化钙和蒙脱土含量过高时,膜的机械性能、透湿度和CO2气体阻隔性能又会变差。综合考虑,PVA∶CaCl2∶MMT的质量比为8∶1.6∶0.8的三元混合基质膜不仅具有高的透湿性和焓交换效率(68%),而且保持了聚乙烯醇膜的极高CO2气体阻隔性,有望作为节能通风系统中全热交换膜的优化选项。

关键词: 聚乙烯醇, 无水氯化钙, 蒙脱土, 透湿, 阻气, 全热交换效率

CLC Number: 

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