超疏水SiO_(2)@OTES自清洁涂层的制备及性能

Superhydrophobic SiO_(2)@OTES preparation and properties of self-cleaning coatings

以纳米二氧化硅颗粒、正辛基三乙氧基硅烷(OTES)和硅烷偶联剂KH560为前驱体,采用溶胶凝胶法制备了超疏水SiO_(2)@OTES自清洁涂层。在酸性催化剂及有机溶剂中,OTES、KH560将纳米颗粒表面由亲水改性为疏水。探究了纳米SiO_(2)、OTES、KH560三种原材料含量对超疏水涂层润湿性能的影响。结果表明,当掺杂3.5 g纳米SiO_(2),8%的OTES与2%的KH560时,涂层达到最佳疏水效果,其接触角为(154±1)°,滚动角为(3.3±0.5)°。采用SEM、FTIR红外光谱仪、X射线光电子能谱(XPS)对超疏水SiO_(2)@OTES材料的表面形貌与化学成分进行了表征。实验表明制备出的超疏水SiO_(2)@OTES自清洁涂层具有良好的自清洁防污、耐低温与耐磨性能,且将涂层回收重新制得的表面仍具有超疏水性。

Superhydrophobic materials were prepared by sol-gel method using nano silica particles,n-octyl triethoxysilane(OTES)and silane coupling agent(KH560)as precursors SiO_(2)@OTES self cleaning coating.In acidic catalyst and organic solvent,OTES and KH560 modified the surface of nanoparticles from hydrophilic to hydrophobic.The influence of the content of nano-SiO_(2),OTES and KH560 on the wettability of the superhydrophobic coating was investigated.The result showed that when 3.5 g nano-SiO_(2),8%OTES and 2%KH560 were doped,the coating achieved the best hydrophobic effect,with a contact angle of(154±1)°,and the rolling angle of(3.3±0.5)°.The SEM,FTIR,and X-ray photoelectron spectroscopy(XPS)were used to analyze the superhydrophobic SiO_(2)@OTES surface morphology and chemical composition of the materials were characterized.The experiment shows that the prepared superhydrophobic SiO_(2)@OTES self-cleaning coating has good self-cleaning,anti fouling,low temperature resistance and wear resistance,and the surface obtained by recycling the coating still has super hydrophobicity.