疏水改性硅溶胶的制备及应用_刘见祥.pdfVIP

疏水改性硅溶胶的制备及应用 1, 2 1 1 3 2, 3, 刘见祥 ，曾舒 ，王聚恒 ，黄晓枭 ，曾化雨 * （1.贵州省冶金化工研究所，贵州 贵阳 550002 ；2.贵州省纳米材料工程中心，贵州 贵阳 550002 ； 3.贵州省纳米材料应用技术工程研究中心，贵州 贵阳 550002 ） 摘要：在60 °C 水浴下用甲基三甲氧基硅烷及甲基乙氧基硅油改性甲醇硅溶胶，然后用丙二醇甲醚醋酸酯置换甲醇得到疏水改性硅 溶胶。评价了其在环己烷、甲苯、乙酸乙酯这 3 种不同极性的有机溶剂中的相容性。研究了加入疏水改性硅溶胶对丙烯酸涂层力 学性能的影响。结果表明，当甲基乙氧基硅油用量为2% ，甲基三甲氧基硅烷用量为15%时，改性硅溶胶的疏水性最好。改性硅溶 胶加入量为 10%时所得丙烯酸涂层的力学性能最好，附着力达到3.96 MPa ，铅笔硬度为3H。 关键词：硅溶胶；改性；甲基三甲氧基硅烷；甲基乙氧基硅油；丙二醇甲醚醋酸酯；疏水性；丙烯酸涂料；力学 中图分类号：TQ630 文献标志码：A 文章编号：1004 – 227X (2016) 06 – 0291 – 04 Preparation and application of hydrophobic modified silica sol // LIU Jian-xiang, ZENG Shu, WANG Ju-heng, HUANG Xiao-xiao, ZENG Hua-yu* Abstract: A hydrophobic modified silica sol was obtained by modifying methanol silica sol with methyl trimethoxysilane and methylethoxylsilicone in a 60 °C water bath, followed by replacing methanol with propylene glycol methyl ether acetate. Its compatibility in three organic solvents, i.e. cyclohexane, toluene and ethyl acetate, was evaluated. The effect of adding hydrophobic modified silica sol on the mechanical properties of acrylic coating was studied. The results showed that the modified silica sol prepared with methyltrimethoxysilane 15% and methylethoxylsilicone 2% has the best hydrophobicity. The acrylic coating containing 10% hydrophobic modified silica sol has the best mechanical properties with an adhesion strength of 3.96 MPa and a pencil hardness of 3H. Keywords: silica sol; modification; methyltrimethoxysilane; methylethoxylsilicone; propylene glycol methyl ether acetate; hydrophobicity; acrylic coating; mechanics First-author’s address: Guizhou Institute of Metallurgy and Chemical Engineering, Guiyang 550002, China DOI:10.19289/j.1004-227x.2016.06.004 硅溶胶又称胶体二氧化硅，具有许多优良的性质，如高渗透性