持效疏水SiO2增透膜的制备和研究

为了提高溶胶-凝胶SiO2增透膜的持效疏水性,以乙醇为溶剂,正硅酸乙酯和甲基三乙氧基硅烷在氨水催化下共水解-缩聚制备了甲基化氧化硅溶胶,然后采用提拉法在洁净的K9玻璃基片上双面镀单层膜。用傅里叶红外光谱仪分析了膜层的化学成分,用接触角测量仪测量了膜层的接触角,用紫外-可见分光光度计测量了膜层的透光率,用椭偏仪测量了膜层的厚度和折射率,并且报道了膜层疏水的持久性。结果表明,共水解膜层具有良好的透光率,峰值透光率可达99.5%;膜层与水的静接触角可达130°;膜层具有持久的疏水性能,疏水性能在相对湿度为90%的环境中可保持5月之久,克服了一般疏水膜疏水效果不持久、不能应用于实际的缺点。

Preparation of durable hydrophobic and antireflective silica coating

To improve the durable hydrophobicity of sol-gel silica antireflective coating,methyl-modified silica sol was prepared through hydrolysis and condensation of tetraethoxysilane and methyhriethoxysilane under ammonia catalysis in ethanol solvent.Then the sol was dip-coated onto both sides of clean K9 glass substrate to form single layer coatings.The chemistry of coating was analyzed by FF-IR spectroscopy,the water contact angle of coating was measured by contact measurement,the transmittance of coating was measured by spectrophotometer,and the thickness and refractive index of coating were measured by spectroscopic ellipsometry.More importantly,the durability of hyddropobicity of hydrophobic coating was reported for the first time.The results showed that coatings gained water repellence and antireflectivity at the same time by introducing CH3 into Si-O-Si linkage.The peak transmittance of the coating was above 99.5%; the static water contact angle was 130°,and the hydropobicity of such coating could last for 5 months in environment with relative humidity of 90%.