硅橡胶超疏水涂层的撒粉法制备  

Preparation of Super-hydrophobic Silicone Rubber Coating by Powder Spraying Method

作　　者：何强 王晓森 宁梦遥 HE Qiang;WANG Xiaosen;NING Mengyao(College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]中国民用航空飞行学院,广汉618307

出　　处：《中国表面工程》2023年第2期146-154,179,共10页China Surface Engineering

基　　金：科技部十三五国家重点研发计划资助项目(2018YFC0809500)。

摘　　要：当前在橡胶基体上构建超疏水表面的方法大多较为复杂,不易制备,研究一种简单方法是十分必要的。以高温硫化硅橡胶(HTV)为基体,把基体打磨后在其表面覆盖一层聚二甲基硅氧烷(PDMS),采用表面撒粉法将二氧化硅(SiO_(2))粉末均匀撒在未固化PDMS上,固化后制得HTV/PDMS-SiO_(2)超疏水表面。采用扫描电子显微镜、三维形貌及接触角测量仪对硅橡胶超疏水涂层的微观形貌和疏水特性进行分析。结果表明:HTV/PDMS-SiO_(2)超疏水表面构建出许多微纳突起粗糙结构,表面粗糙度Sa达到35.695μm;HTV/PDMS-SiO_(2)超疏水表面的静态接触角平均值达154.5°,相较于原始硅橡胶平均静态接触角112.4°提升了37.5%;液滴体积一定时,液滴接触到超疏水表面后的铺展直径和第一次弹起高度随着滴落高度的增大而增大;液滴滴落高度一定时,液滴铺展直径和初次弹起高度与液滴体积成正比。利用PDMS固化过程结合撒粉工艺构建超疏水微纳结构,可为硅橡胶超疏水表面研究提供一种简单、低成本方案。Most current methods for constructing superhydrophobic surfaces on rubber substrates are too complex to carry out;therefore,it is essential to investigate a simple method.High-temperature vulcanized silicone rubber(HTV) and polydimethylsiloxane(PDMS),which have the advantage of low surface energy,combined with the hydrophobic properties of silicon dioxide(SiO_(2)),were selected to prepare superhydrophobic coatings on silicone rubber surfaces in this paper.The specific steps are as follows.The rubber matrix was prepared first.The HTV rubber and vulcanizing agent were added in an open refiner until the vulcanizing agent was uniformly mixed in the HTV rubber.The rubber was then vulcanized using a fully automatic plate vulcanizer,where the vulcanization temperature was 175 ℃ and the time was 10 min.The vulcanized rubber was cooled at room temperature for 24 h,and then polished with a metallographic polishing machine.The rubber was polished in one direction using the same sandpaper and the machine was never moved.After polishing,the rubber was placed in a beaker with alcohol and cleaned using an ultrasonic cleaner.Since the rubber matrix had been accomplished,a mixture of 3 g PDMS and 0.3 g curing agent was added into the beaker containing the rubber matrix for PDMS coating.After curing at room temperature for 20 min,the silica powder was evenly spread on the surface of the PDMS using a sieve.Then the beaker was placed in a drying oven and cured at 80 ℃ for 2 h.After curing,the prepared superhydrophobic silicone rubber was removed from the oven,and excess silica powder was removed using nitrogen gas to prevent excess silica powder from affecting the hydrophobicity of the prepared coating.The hydrophobicity of the prepared superhydrophobic surfaces was assessed.First,the contact angles of the original silicone rubber samples and the HTV/PDMS-SiO_(2) superhydrophobic silicone rubber were tested using a contact angle measuring instrument.Next,the surface microstructures of the HTV/PDMS-SiO_(2superhydrophobic) silicon

关 键 词：硅橡胶 超疏水 聚二甲基硅氧烷(PDMS) SiO_(2) 接触角 自清洁 

分 类 号：F767[经济管理—产业经济] TQ333[化学工程—橡胶工业] V261[航空宇航科学与技术—航空宇航制造工程]