十四酸改性SiO_(2)/超支化PDMS自修复涂层的制备及其超疏水性能  

Preparation of myristic acid modified SiO_(2)/hyperbranched-PDMS self-healing coating and its superhydrophobic performance

作　　者：朱航 刘静 雷西萍[1] 田甜 宋晓琪 ZHU Hang;LIU Jing;LEI Xiping;TIAN Tian;SONG Xiaoqi(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》2024年第1期227-239,共13页Acta Materiae Compositae Sinica

基　　金：西安建筑科技大学基础研究基金(ZR21026);校级基础研究基金(1609722026)。

摘　　要：为了提高超疏水涂层的耐久性,通过设计“基底-黏性自修复聚合物-疏水粒子”自下而上的涂层体系,制备了具有自修复功能的超疏水表面:以含有丰富氢键的超支化聚硅氧烷(HB-PDMS)作为黏性自修复聚合物,通过十四酸(MA)对纳米SiO_(2)进行疏水改性作为疏水粒子以构筑表面粗糙结构。探究了SiO_(2)改性的最佳工艺:当MA与SiO_(2)质量比为1∶1,改性时间为3 h时,所制备的超疏水涂层接触角为152.61°,滚动角为1.9°,具有优异的防污性能。涂层经受刀片划伤后通过简单热处理即可修复划痕,自修复性能优异。与纯铝相比,该复合涂层具有良好的防腐性能,缓蚀效率可达87.53%。此外,经历5次胶带剥离、磨损长度为30 cm的线性耐磨测试、50 min的超声振荡测试、10次温差循环和24 h紫外照射后,接触角依旧保持在150°以上,说明该涂层具有良好的耐候性和机械稳定性。该研究为自修复超疏水涂层的制备提供了新策略,有望应用于建筑防污领域。In order to improve the durability of superhydrophobic coatings,in this work,we designed a bottom-up coating system of“substrate-viscous self-healing polymer-hydrophobic particle”,thereby the superhydrophobic surface with self-healing function was successfully fabricated:Hyperbranched polydimethylsiloxane(HB-PDMS)with abundant hydrogen bonds as viscous self-healing polymer;Nano-SiO_(2) was hydrophobic modified by myristic acid(MA)as hydrophobic particles to construct rough surface structure.When the mass ratio of MA to SiO_(2) is 1∶1 and the modification time is 3 h,the superhydrophobic coating prepared has a contact angle of 152.61°and a sliding angle of 1.9°,which has excellent antifouling performance.The coating can be healed by simple heat treatment after being scratched by the blade,and has excellent self-healing performance.Compared with pure aluminum,the composite coating has better anti-corrosion performance and the corrosion inhibition efficiency can reach 87.53%.In addition,After 5 tape peel tests,linear wear tests with a wear length of 30 cm,ultrasonic shock tests of 50 min,10 temperature differential cycles and 24 h ultraviolet irradiation,the contact angle remained above 150°,indicating that the coating has good mechanical stability and weather resistance.This study provides a new effective strategy for the preparation of self-healing superhydrophobic coatings,which is expected to be applied in the field of building antifouling.

关 键 词：自修复 超疏水 二氧化硅 表面改性 十四酸 建筑防污 

分 类 号：TB332[一般工业技术—材料科学与工程]