选择硅溶胶为研究对象，通过甲基硅酸钾（PMS）对其进行原位改性制得疏水改性硅溶胶，利用SEM、TEM、纳米粒度分析仪、FT-IR、XPS表征改性前后硅溶胶的微观形貌和化学结构，并探究了不同质量分数PMS改性硅溶胶对硅溶胶涂料疏水、耐水性能的影响。结果表明，PMS通过脱水缩合接枝到Si—O—Si网状涂膜结构中，促进硅溶胶成膜并显著提升了涂层的力学性能和疏水、耐水性能；当PMS质量分数为5%时，涂层表现出较好的性能，铅笔硬度达到6 H，表面接触角为152°，吸水率仅为0.9%。

Silica sol is modified in situ by potassium methyl silicate (PMS) to obtain hydrophobic modified silica sol. SEM, TEM, nano-particle size analyzer, FT-IR and XPS are utilized to characterize the microscopic morphology and chemical structure of silica sol before and after modification. The influences of different PMS dosages on the hydrophobic and water-resistant properties of silica sol coating are investigated. Experimental results show that PMS has been grafted into Si—O—Si mesh coating structure through dehydration condensation, promoting silica sol to form film and improve significantly the mechanical, hydrophobic and water resistance properties of the coating. As the amount of PMS is 5wt%, the coating shows better performance with 6 H of pencil hardness, 152° of surface contact angle, and 0.9% of water absorbing rate.

田振琨(1995-),男,硕士研究生,研究方向为无机涂料开发,tzk1240127171@163.com