膜科学与技术

聚酰胺复合膜表面高渗透性抗污染涂层的构建

作者：王炎锋，吕振华，姜鹏，俞三传

单位： 1.杭州天创环境科技股份有限公司，杭州311121；2.浙江理工大学理学院，杭州 310018

关键词：聚酰胺复合膜；抗污染性能；高渗透性；聚乙烯醇；羟丙基甲基纤维素

出版年,卷(期):页码： 2020,40(1):31-36

摘要：

通过物理涂覆-交联方式，在聚酰胺复合膜表面构建聚乙烯醇（PVA）涂层，研究添加剂羟丙基甲基纤维素（HPMC）对涂层渗透性能及抗污染性能的影响，制备兼具优抗污染性能及高渗透性能的聚酰胺复合膜。分离性能研究表明：含纯PVA涂层的聚酰胺复合膜纯水通量为46.4 Ll/m2 h，而含PVA/HPMC涂层的聚酰胺复合膜纯水通量为54.3 l/m2 h，纯水通量提升17 %。这主要是因为PVA相对较为规整且含有大量的羟基，易因氢键形成结晶区，不利于水分子的渗透；而HPMC的加入，PVA分子链之间的规整度被破坏，降低涂层结晶度，更加利于水分子的渗透。抗污染实验表明：PVA与PVA/HPMC涂层均能明显提升聚酰胺复合膜抗污染性能，而添加HPMC既能保持PVA涂层优良的抗污染性能，又能提高PVA涂层的渗透性。

In this study, poly(vinyl alcohol) (PVA) anti-fouling surface coating layer was constructed onto polyamide nanofiltration membrane via the process of surface coating followed by crosslinking, and the effects of additive hydroxypropyl methylcellulose (HPMC) on the permeability and antifouling property of PVA coating layer were studied. Separation performance evaluation revealed that the pure water flux of polyamide membrane with PVA coating layer was only 46.4 l/m2 h, while with PVA/HPMC coating layer was 54.3 l/m2 h, showing an increase of 17%. This is mainly due to the reduction of the degrees of tacticity and crystalline of PVA coating layer by introducing HPMC. Anti-fouling experiments revealed that both the PVA and PVA/HPMC coating layers could endow the membrane with improved antifouling property and the blending of HPMC had no effect on antifouling property. The results show that adding HPMC could improve the permeability of PVA coating layer while maintaining its excellent anti-fouling performance.

第一作者简介：王炎锋（1976.01），男，浙江上虞人，工程师，从事反渗透和纳滤膜材料的制备及应用研究，E-mail：wangyanfeng1976@163.com 通讯作者，E-mail:yuschn@163.com

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