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以正硅酸乙酯(TEOS)为无机前躯体,端羟基硅油(PDMS)为有机杂化剂,在两种催化剂酒石酸(TA)、二月桂酸二丁基锡(DBTL)的作用下,分别制备了TEOS水解-缩合溶胶、TEOS-PDMS杂化水解-缩合溶胶。利用制备的两种溶胶表层浸渍水泥净浆试件,通过测试处理水泥净浆试件的吸水率、接触角评价了两种防水剂的阻水效果;结合红外光谱分析了两种防水剂的形成过程以及作用机理。研究结果表明:表层浸渍处理的水泥净浆试件,其吸水率与水接触角具有良好的相关性;相比于TA,DBTL催化TEOS经水解-缩合形成的防水剂阻水性能更好;PDMS改性TEOS形成的TEOS-PDMS防水剂较杂化前具有更强的阻水性能;防水剂的阻水效果与其凝胶结构中的疏水基团数量密切相关。
TEOS was used as the inorganic precursor and PDMS was used as the organic hybrid agent. Under the action of two catalysts, tartaric acid (TA) and dibutyltin dilaurate (DBTL) TEOS hydrolysis-condensation sol, TEOS-PDMS hybrid hydrolysis-condensation sol. The prepared two kinds of sol surface impregnated cement paste specimens, through the test and treatment of cement paste samples of water absorption, contact angle evaluation of the two water repellent water blocking effect; combined with infrared spectroscopy analysis of the formation of two waterproofing agent Process and mechanism of action. The results show that the surface water absorption of cement pastes treated with surface immersion has a good correlation with the water contact angle. Compared with TA, the water repellency of DBOS catalyzed by hydrolysis-condensation of TEOS is better. PDMS The TEOS-PDMS water-repellent agent formed by modified TEOS has stronger water-blocking property than that before hybridization. The water-blocking agent’s water-blocking effect is closely related to the number of hydrophobic groups in its gel structure.