透明超疏水SiO2/硅酮胶复合涂层的制备及性能

以疏水纳米SiO_2和中性硅酮结构胶为主要原料,采用喷涂法在玻璃表面制备出透明超疏水SiO_2/硅酮胶复合涂层。采用FTIR、SEM、接触角测量仪和紫外-可见分光光度计对复合涂层的分子结构、微观形貌、润湿性和透光率进行表征。讨论了纳米SiO_2的添加量与涂层表面微结构、水接触角、透明性三者的关系,考察了复合涂层的耐水冲击性能和耐水稳定性能。结果表明:SiO_2/硅酮胶复合涂层表面呈连续的多孔网络状,团聚的SiO_2纳米粒子分散在作为骨架的亚微米级硅酮胶周围,构成了微纳米双尺度的复合粗糙结构。当SiO_2质量分数为2.0%时,复合涂层的水接触角达到最大为169.8°±0.7°,在380～760nm可见光范围内的平均透光率为82.9%;当硅酮胶质量分数为4%时,复合涂层分别经5 h水冲击以及10 d水浸泡后,水接触角仍保持在140°以上。

Preparation and properties of transparent superhydrophobic SiO2/silicone sealant composite coatings

Transparent superhydrophobic SiO2/ silicone sealant composite coatings were prepared by spray coating method with hydrophobic nano-SiO2 and neutral silicone structural sealant, which were used as main raw materials. The molecular structure, microstructure, wettability and transmittance of the composite coatings were characterized by FTIR, SEM, contact angle measurement and UV-vis spectrophotometer. The relationship between the content of nano-SiO2 and the surface microstructure, water contact angle and transparency of the coatings was discussed. The water impact resistance and water stability of the composite coatings were also studied. The results showed that the surface of the SiO2/silicone sealant composite coatings displayed the continuous porous network structure, and aggregated SiO2 nanoparticles dispersed around the sub-micron silicone sealant which acted as the backbones, forming the micro-nano composite rough structures. When the mass ratio of nano-SiO2 was 2%, the maximum water contact angle of 169.8? and the average transmittance of 82.9% under visible range from 380 nm to 760 nm were obtained. In addition, when the mass ratio of silicone sealant was 4%, the water contact angle of the composite coatings remained above 140?after 5 h of water impact and 10 d of water immersion respectively.