十四酸改性SiO2/超支化PDMS自修复涂层的制备及其超疏水性能
Preparation of myristic acid modified SiO2/hyperbranched-PDMS self-healing coating and its superhydrophobic performance
朱航 1刘静 1雷西萍 1田甜 1宋晓琪1
作者信息
- 1. 西安建筑科技大学 材料科学与工程学院,西安 710055
- 折叠
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SiO2 进行疏水改性作为疏水粒子以构筑表面粗糙结构.探究了SiO2 改性的最佳工艺:当MA与SiO2 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.
Abstract
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-SiO2 was hydrophobic modified by myristic acid(MA)as hydrophobic particles to construct rough surface structure.When the mass ratio of MA to SiO2 is 1∶1 and the modification time is 3 h,the superhydrophobic coating prepared has a contact angle of 152.61° and a slid-ing 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 build-ing 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Key words
self-healing/superhydrophobic/SiO2/modification/myristic acid/building antifouling引用本文复制引用
基金项目
西安建筑科技大学基础研究基金(ZR21026)
校级基础研究基金(1609722026)
出版年
2024
NETL
NSTL
万方数据