烷基SiO_(2)制备条件对PTFE膜疏水改性效果的影响  

Effect of alkyl SiO_(2) dipping solution on the superhydrophobic modification of PTFE membranes

作　　者：邵伟[1] 彭倩倩 郭春刚 常娜[1] 王海涛[3] 刘国昌 SHAO Wei;PENG Qianqian;GUO Chungang;CHANG Na;WANG Haitao;LIU Guochang(College of Chemical Engineering and Technology,Tiangong University,Tianjin 300387,China;The Institute of Seawater Desalination and Multipurpose Utilization,MNR(Tianjin),Tianjin 300192,China;School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学化学工程与技术学院,天津300387 [2]自然资源部天津海水淡化与综合利用研究所,天津300192 [3]天津工业大学环境科学与工程学院,天津300387

出　　处：《膜科学与技术》2024年第6期64-70,共7页Membrane Science and Technology

基　　金：中央级公益性科研院所基金(K-JBYWF-2023-QR-02);企业合作研发课题(B5-20210429)。

摘　　要：疏水性聚四氟乙烯(PTFE)膜在膜蒸馏、膜吸收等膜接触器过程中具有广泛应用前景.以纯水、无水乙醇、氨水、正硅酸乙酯(TEOS)为原料,采用溶胶凝胶法制备二氧化硅(SiO_(2))纳米粒子胶体溶液,进而以甲基三乙氧基硅烷(MTES)为有机改性剂,对SiO_(2)纳米粒子进行表面修饰,制备得到烷基SiO_(2)浸涂液.探究了原料比例对SiO_(2)纳米粒子粒径大小的影响;进一步考察了浸涂液制备时长以及MTES与TEOS质量比对PTFE膜疏水改性效果的影响.结果表明,增大氨水、TEOS用量并提升纯水与无水乙醇的比例,可减小SiO_(2)纳米粒子的粒径;延长制备时间或提升MTES与TEOS质量比,均会使膜表面接触角先增大后减小;当原料质量比为13.32∶11.92∶1.92∶1(纯水、无水乙醇、氨水、正硅酸乙酯)、烷基SiO_(2)浸涂液的制备时长为24 h、MTES与TEOS的质量比为3∶1时,改性后PTFE膜表面接触角可达156°,超疏水效果显著.Hydrophobic polytetrafluoroethylene(PTFE)membrane has a wide application prospect in membrane contactor processes such as membrane distillation and membrane absorption.In this research,a colloidal solution of silica(SiO_(2))nanoparticles was prepared by sol-gel method,using pure water,anhydrous ethanol,ammonium hydroxide,and tetraethyl orthosilicate(TEOS)as raw materials.Then,with methyl triethoxysilane(MTES)used as the organic modifier,SiO_(2) nanoparticles were modified on the surface to prepare the alkyl SiO_(2) dipping solution.This research investigated the effect of raw material ratio on the particle size of SiO_(2) nanoparticles,along with the effects of preparation time and mass ratio of MTES to TEOS on the hydrophobic modification of PTFE film were further investigated.The results show that the size of SiO_(2) nanoparticles can be reduced by increasing the amount of ammonium hydroxide and TEOS,and increasing the ratio of pure water to anhydrous ethanol.Extending the preparation time or increasing the mass ratio of MTES to TEOS could increase the contact angle of the membrane surface at first and then decreased.When the mass ratio of raw material was 13.32∶11.92∶1.92∶1(pure water,anhydrous ethanol,ammonium hydroxide,and tetraethyl orthosilicate),the preparation time of alkyl SiO_(2) dipping solution was 24 h,and the mass ratio of MTES to TEOS was 3∶1,the surface contact angle of the modified PTFE membrane reached 156°,and the superhydrophobic effect was significant.

关 键 词：烷基二氧化硅 聚四氟乙烯膜 超疏水 溶胶凝胶 

分 类 号：TQ316.6[化学工程—高聚物工业] TQ325.4