基于单宁酸制备可喷涂超疏水材料

通过正硅酸乙酯水解合成了二氧化硅纳米粒子并形成凝胶颗粒,加入单宁酸以优化其形貌,以六甲基二硅氮烷为表面改性剂,合成了具有低表面能的超疏水喷涂材料。并用动态光散射仪(DLS)与扫描电镜(SEM)对其表征。将其分散于乙醇,并对纸张、玻璃、铝箔、木板、棉质纺织物、塑料泡沫等常见表面进行喷涂,均在短时间内构成了超疏水表面,水接触角均在150.0°以上。随后,考察了所制备超疏水涂层在受外力破坏后的自修复性与耐磨性。结果显示:1 g/L的喷涂液仅需喷三层即可构建超疏水表面,得到的涂层具有良好的透明性;超疏水涂层在受外力损坏后可用有机溶剂进行快速简易的自修复;且喷涂后的玻璃片在砂纸上负重磨损距离达到1000 mm后,接触角从153.5°降至105.5°,再喷一层即可恢复到154.0°。

Preparation of Sprayable Superhydrophobic Materials Based on Tannic Acid

Silica gel nanoparticles were synthesized by hydrolysis of tetraethyl orthosilicate to form gel particles. Tannic acid was added to optimize their morphology. A superhydrophobic spraying material with low sur-face energy was synthesized by using hexamethyldisilazane as surface modifier. It was dispersed in ethanol and sprayed on common surfaces such as paper, glass, aluminum foil, wood board, cotton textile and plastic foam, all of which formed super hydrophobic surfaces in a short time, and the water contact angles were above 150°. Subsequently, the self-repair properties of the prepared superhydrophobic coating after being destroyed by external force were investigated. The results show that the spray solution of 1 mg/mL only needs to be sprayed with three layers to construct the superhydrophobic surface, and it has good transparency. The sprayed glass were rubed with heavy on the sand paper for 1000 millimeter, the contact angle decreased from 153.5° to 105.5°, and then sprayed one layer back to 154°. And also, the su-perhydrophobic coating can be repaired by organic solvent quickly and easily after being damaged by ex-ternal force.