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高通量聚乙烯基反渗透膜制备

作者：杜文林，任凤伟

单位：江苏艾德漫斯新材料有限公司, 扬州 225800

关键词：聚乙烯隔膜；溶剂活化；重氮化；反渗透膜

DOI号： 10.16159/j.cnki.issn1007-8924.2025.02.012

分类号： TQ051.893

出版年,卷(期):页码： 2025,45(2):100-108

摘要：

近两年净水器呈现大通量产品迭代趋势，从2 271 L/d到4 542 L/d，甚至是6 056 L/d。目前，提升产水量的方式主要有增加反渗透膜数量以及增强增压泵动力，但势必会带来净水器体积的增大和生产成本的增加。本研究以超薄聚乙烯（PE）隔膜替代传统聚砜无纺布作为基底，通过简单的溶剂活化和重氮化后处理的方式制备出了低压高通量PE基反渗透膜(PERO)，在0.41 MPa、0.25 g/L NaCl条件下，PERO膜通量达到110 L/（m2·h），脱盐率约为97.5%。通过选择适当活化强度的二甲基甲酰胺溶剂，溶出聚酰胺层中的残留物和低聚物，使聚酰胺层结构更加疏松，再通过重氮化利用聚酰胺层中残余伯氨基反应形成重氮盐，重氮盐基团再与残余芳香氨基或重氮盐水解芳香酚基发生偶氮交联反应，来进一步提高反渗透膜脱盐率。

In the past two years, water purifiers have shown a trend of large throughput product iteration, from 2 271 L/d to 4 542 L/d, and even 6 056 L/d. At present, the main way to improve water production is to increase the number of reverse osmosis (RO) membrane and enhance the power of the booster pump, but it is bound to bring about an increase in production costs and an increase in the volume of the water purifier. In this study, ultra-thin polyethylene (PE) membrane was used as the substrate to replace polysulfone non-woven fabric, and low pressure and high throughput PE-based reverse osmosis membrane (PERO) was prepared by simple solvent activation and diazotization post-treatment. Under the conditions of 0.41 MPa and 0.25 g/L NaC1, the flux of PERO membrane reached 110 L/(m2·h). and the desalting rate was about 97.5%. By choosing DMF solvent with appropriate activation strength, the residues and oligomers in the PA layer were dissolved to make the structure of the PA layer more porous. Then, the residual primary amine group in the polyamide layer was reacted to form diazo salt through diazotization, and the diazo salt group was then crosslinked with the residual aromatic amine group or the aromatic phenol group of the diazo saline solution to further improve the desalination rate of the reverse permeability membrane.

基金项目：

作者简介：

杜文林（1989-），男，湖南株洲人，硕士研究生，研究方向为反渗透及纳滤膜材料开发

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