PE基聚硅氧烷/改性SiO2超疏水薄膜的构筑

Construction of PE-based polysiloxane/modified SiO2 superhydrophobic film

摘要:

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，并作为超疏水改性剂添加到有机硅树脂（SI）中，之后采用两步法在聚乙烯（PE）薄膜表面固化制备了SI-SiO2（SI/OTMS-SiO2）功能复合涂层。并通过一系列结构表征确定了改性后纳米SiO2及复合涂层化学结构。结果表明，SiO2表面成功引入OTMS，且改性SiO2均匀附着在硅树脂涂层上，并得到了PE基固化涂层。随后，通过SEM和AFM表征了改性SiO2的引入对复合涂层表面粗糙度的影响，并探索了构建超疏水涂层的机理。在此基础上，系统地探究改性SiO2结构对涂覆SI/OTMS-SiO2超疏水涂层的PE薄膜的超疏水特性、耐磨性、热稳定性等应用性能的影响，并研究了复合涂层表面的微观形貌及其疏水性能。

Abstract:

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.