摘要
目的通过简单的一步喷涂法,以成膜树脂和疏水纳米粒子为材料,构建具有优异机械稳定性和抗结冰性的无氟耐用超疏水涂层(RSHC)。方法以有机硅树脂(SI)和环氧树脂(EP)为成膜物质,掺入具有疏水性的SiO_(2)复合尺度纳米粒子,采用一步喷涂法制备涂层。采用接触角测量仪等测量涂层的表面浸润性,通过线性摩擦实验、胶带剥离实验、射流冲击实验等测定涂层的机械稳定性,通过静态结冰实验、低温弹跳和冻雨实验等测定涂层的抗结冰性能。结果制备的涂层表现出优异的超疏水性,其接触角为158°±4°,滚动角为8°±0.6°。当有机硅树脂、环氧树脂和SiO_(2)纳米粒子的质量比为2.8∶1.2∶1时,涂层表面在具有良好疏水性的同时仍具有极佳的力学性能。线性摩擦实验结果表明,涂层具有良好的耐磨损性能,经过100次摩擦循环后,其表面水滴接触角仍可达到157°;胶带剥离实验结果表明,涂层与基底间具有坚实的附着力,在测试20次后其表面的水滴接触角仍保持大于150°;射流冲击实验结果表明,涂层具有一定的抗冲击性,在射流冲击30 min后涂层的表面接触角未明显减小。此外,覆盖涂层的基底具有优异的静态结冰延迟性能和动态防覆冰性能。在静态结冰实验中,涂层表面液滴的结冰时间延迟了约7倍;在低温弹跳和冻雨实验中,滴落的水滴能从表面完全弹起滚落,并且在低温冻雨环境中其表面可以保持无覆冰。结论制备的耐用超疏水涂层具有良好的疏水性、机械稳定性和抗结冰性能,对耐用超疏水涂层的研究及实际应用具有一定的参考价值。
Superhydrophobic surfaces hold great application prospects in the fields of self-cleaning,drag reduction,condensing heat transfer and anti-icing.However,conventional superhydrophobic surfaces have some disadvantages such as complex preparation process and poor durability.The work aims to construct a fluorine-free robust superhydrophobic coating(RSHC)with excellent mechanical stability and anti-icing performance by simple one-step spraying process with film forming resin and hydrophobic nanoparticles.Silicone resin(SI)and epoxy resin(EP)were used as film forming materials,and hydrophobic SiO_(2) composite nanoparticles were added to prepare superhydrophobic coatings by one-step spraying.The surface wettability was characterized by contact angle measuring instrument.The surface morphology and elemental composition were characterized by scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).By adjusting the ratio of SI,EP and SiO_(2) nanoparticles,the effects of different ratio of material composition on the coating properties were explored.The mechanical stability was assessed by linear friction test,tape stripping test and jet impact test.The coating was placed on sandpaper(grit no.1000)and reciprocally pushed for 10 cm under a weight of 100 g to complete the linear friction test.The process of tape stripping test was to peel off from one end to the other at a uniform speed with tape after the coating surface was cross scratched.In the jet impact test,a high pressure water jet(42 kPa)was used to impact the superhydrophobic coating surface vertically.Moreover,the icing resistance of the surface was verified by tests including static drop freezing,drop bouncing at a low temperature and freezing rain impact.The static freezing experiment was performed by comparing the freezing time of static droplets on surfaces with or without coatings.The dynamic freezing test included drop bounce at a low temperature and freezing rain impact.The drop freezing time and drop impact dynamics were visualized and comp
作者
李天然
卢晨光
原子超
刘聪
李云单
刘亚华
LI Tian-ran;LU Chen-guang;YUAN Zi-chao;LIU Cong;LI Yun-dan;LIU Ya-hua(Dalian University of Technology,Liaoning Dalian 116024,China;AVIC Shenyang Engine Design and Research Institute,Shenyang 110065,China;Key Laboratory of Bionic Engineering(Ministry of Education),Changchun 130022,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2022年第11期385-394,404,共11页
Surface Technology
基金
国家自然科学基金(52075071)
工程仿生教育部重点实验室开放基金(KF20200002)
中国空气动力研究与发展中心结冰与防除冰重点实验室开放课题资助项目(IADL 20210405)。
关键词
超疏水涂层
喷涂
机械稳定性
抗结冰
superhydrophobic coating
spraying
mechanical stability
anti-icing
