纳米SiO_(2)@超支化PDMS复合超疏水涂层的制备与性能调控  

Construction and property regulation of nano-SiO_(2)@hyperbranched PDMS composite superhydrophobic coating

作　　者：刘静 雷西萍[1] 于婷 陈浩男 樊凯 LIU Jing;LEI Xiping;YU Ting;CHEN Haonan;FAN Kai(School of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《复合材料学报》2023年第2期872-883,共12页Acta Materiae Compositae Sinica

基　　金：生态环境相关高分子材料教育部重点实验室开放基金(KF-18-01);西安建筑科技大学基础研究基金(ZR21026)。

摘　　要：超疏水涂层在实际应用中受化学腐蚀、刮擦磨损等外界环境的影响,易造成涂层老化、开裂甚至脱落,造成涂层失效。因此,针对这一问题,设计出具备耐候性的自修复超疏水表面:以超支化聚二甲基硅氧烷为柔性基底和低表面能物质,引入纳米二氧化硅构筑表面粗糙结构,制备超疏水涂层。当SiO_(2)粒径为50 nm、固含量为30wt%时,得到了接触角为154.87°的超疏水涂层。经过5次胶带剥离试验,涂层表现出良好的机械稳定性。经历10次温差循环试验和24 h紫外光照射后,涂层表面接触角仍大于150°,表明涂层具有良好的耐候性。涂层经过80℃、2 h的热处理可修复划痕,表明该涂层具有一定的自修复功能。同时,Tafel及Nyquist测试结果表明,对基底进行超疏水处理可显著提高防腐性能,并且该涂层具有明显的自清洁效果。综上所述,本文所制备的纳米SiO_(2)@超支化聚二甲基硅氧烷(PDMS)复合超疏水涂层具有自修复功能,为自修复超疏水涂层的开发提供了新的研究策略。In practical application,affected by chemical corrosion,scratch and wear and other external environment,superhydrophobic coating is easy to aging,cracking and even falling off,resulting in coating failure.Therefore,to solve this problem,a self-healing superhydrophobic surface with weather resistance was designed:Hyperbranched polydimethylsiloxane(PDMS)was used as a flexible substrate and low surface energy material,and nano-silica was introduced to construct the surface rough structure to prepare the superhydrophobic coating.When SiO_(2)particle size is 50 nm and solid content is 30wt%,the superhydrophobic coating with contact angle of 154.87°is obtained.The coating shows good mechanical stability after 5 times of tape peeling test.After 10 temperature difference cycling tests and 24 h UV irradiation,the surface contact angle is still greater than 150°,indicating that the coating has good weather resistance.The scratches can be partially healed by heat treatment at 80℃for 2 h,indicating that the coating has certain self-healing function.At the same time,Tafel and Nyquist test results indicates that superhydrophobic treatment can significantly improve the corrosion resistance of the substrate,and the coating has obvious self-cleaning effect as well.In conclusion,the nano-SiO_(2)@hyperbranched PDMS composite superhydrophobic coating prepared in this work has self-healing function,which provides a new research strategy for the development of self-healing superhydrophobic coating.

关 键 词：超疏水涂层 自修复 二氧化硅 耐候性 耐久性 

分 类 号：TB332[一般工业技术—材料科学与工程]