喷涂法制备硅藻土/Al2O3超疏水涂层的研究

Study on preparation of diatomite / Al2O3 superhydrophobic coating by spraying

摘要:

以微米级硅藻土和纳米级氧化铝粒子为原料，构筑具有一定粗糙结构的表面，以十六烷基三甲氧基硅烷（HDTMOS）为低表面能改性剂，以环氧树脂为粘接剂，制得硅藻土/Al2O3基复合超疏水涂层。首先，通过HDTMOS水解液对硅藻土和氧化铝粒子进行表面改性，再加入环氧树脂溶液获得悬浮液，采用喷涂法将上述悬浮液喷涂于基底表面，经加热固化后得到超疏水涂层。通过单因素实验筛选出最佳制备工艺（ V(HTDMOS)∶V(乙醇)=0.04∶1；m(硅藻土)∶m(Al2O3) =1.5∶0.8；m(E51)∶m(丙酮) =1∶5），其表面水静态接触角高达163.4°，扫描电镜观察其表面呈粗糙度均匀的微观分级结构。涂层适用于滤纸、木块、不锈钢板等多种基底，均可表现出优异的超疏水性能。同时，该涂层经过100次的循环磨损实验后，其表面水静态接触角仍高达146.3°。

Abstract:

In this study, using micron diatomite and nanometer alumina particles as raw materials, the surface with a certain rough structure was constructed. Using cetyltrimethoxysilane (HDTMOS) as low surface energy modifier and epoxy resin as adhesive, the diatomite /Al2O3 composite superhydrophobic coating was prepared. Firstly, diatomite and alumina particles were surface modified by HDTMOS hydrolyzate, and then epoxy resin solution was added to obtain suspension. The suspension was sprayed on the surface of the substrate by spraying method, and the superhydrophobic coating was obtained after heating and curing. The optimum preparation process (V(HTDMOS)∶V(ethanol)=0.04∶1; m (diatomite)∶ m (Al2O3) =1.5∶0.8; m (E51)∶ m(acetone) =1∶5), the water static contact angle of the surface is as high as 163.4°, and the surface is characterized by uniform microstructure by scanning electron microscopy. The coating is suitable for filter paper, wood block, stainless steel plate and other substrates, which can show excellent superhydrophobic properties. Meanwhile, the surface water static contact angle of the coating is still as high as 146.3° after 100 cycles of wear experiments.