PE基聚硅氧烷/改性SiO2超疏水薄膜的构筑

使用十八烷基三甲氧基硅烷(OTMS)对纳米SiO2进行表面疏水改性,将得到的改性纳米SiO2(OTMS-SiO2)添加到有机硅树脂(SI)中,然后采用两步法在聚乙烯(PE)薄膜表面固化制备了复合涂层SI/OTMS-SiO2.通过FTIR、1HNMR、29SiNMR、TGA对OTMS-SiO2及复合涂层进行了表征,采用接触角测量仪、SEM、AFM对复合涂层疏水特性和形貌进行了测试和观察,最后对复合涂层的耐磨性和附着力进行了分析.结果表明,SiO2表面成功引入了OTMS,且OTMS-SiO2均匀附着在硅树脂涂层上,增加了表面粗糙度,得到了PE基固化超疏水复合涂层.当OTMS-SiO2添加量为正己烷质量的8％时,制得的复合涂层的水接触角为154°,滚动角为7°,并具有良好的耐磨性,其附着力可达4A等级.

Construction of PE-based polysiloxane/modified SiO2 superhydrophobic film

Octadecyltrimethoxysilane (OTMS) was introduced to hydrophobically modify the surface of nano-silica, then the modified lipophilic silica was added into the silicone resin (SI) as a superhydrophobic modifier. Subsequently, SI/OTMS-SiO2 functional composite coating was constructed with the polyethylene (PE) as a substrate utilizing a two-step cure method. The accurate chemical structure of the modified nano-silica and the composite coating were determined by means of the chemical structure characterization, resulting that OTMS was successfully integrated onto SiO2 and OTMS-SiO2 uniformly loaded onto the silicone surface, as well as the composite coating was obtained. Then, the effects of the introduction of modified SiO2 on the surface roughness of the composite coating were characterized by SEM and AFM, and the mechanism of constructing a superhydrophobic coating was invested. On this basis, the effects of the modified SiO2 structure on the superhydrophobic properties, wear resistance, thermal stability and other properties of PE films coated with SI/OTMS-SiO2 superhydrophobic coating were systematically investigated, and the microscopic morphology of the composite coating surface and its hydrophobic properties were studied.