Improving the Performance of Water Glass Used in the High-speed Rail Slab Coating by the Synergistic Effect of Controlling Polymerization and Precipitation
LI Maohong1, WEN Jing1, LI Yirui1, QU Shuxin2, ZENG Xiaohui1, WANG Ping1
1 Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031
Abstract: As CaO may affect the pH and Zeta potential of water glass and cause a synergistic effect of controlling polymerization of polymers in water glass and forming precipitation, it is expected to improve the mechanical strength and water resistance of water glass. To improve the mechanical strength and water resistance of water glass used in high-speed rail slab coating, this paper tries to modify water glass by CaO and to explore the mechanism of such modification. The results showed a higher water resistance and a 77% rise in mechanical strength for water glass modified by CaO. The investigation of Zeta electrometer, pH meter, X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FTIR), and solid-state high-resolution 29Si MAS NMR (NMR) found that the addition of CaO increased pH and zeta potential of water glass; caused silicon oxygen polymer to depolymerize and recombine; and led to silicon oxygen polymer mainly existing in the form of chain polymer (Q2) under the synergistic effects of Ca2+. At the same time, Ca2+ was combined with Q2 to form CaO·xSiO2·yH2O (CSH) gel which is of better water resistance and higher mechanical strength, rather than silica oxygen polymer with a large amount of Na+ and poor water resistance. It is concluded that the addition of CaO improves mechanical strength and water resistance of water glass by the synergistic effect of controlling polymerization and precipitation, and therefore CaO has good prospects for application in water glass used in high-speed rail slab coating.
李茂红, 温静, 李依芮, 屈树新, 曾晓辉, 王平. 控制聚合与沉淀协同作用改善高铁轨道板涂料用水玻璃性能[J]. 材料导报, 2018, 32(24): 4264-4268.
LI Maohong, WEN Jing, LI Yirui, QU Shuxin, ZENG Xiaohui, WANG Ping. Improving the Performance of Water Glass Used in the High-speed Rail Slab Coating by the Synergistic Effect of Controlling Polymerization and Precipitation. Materials Reports, 2018, 32(24): 4264-4268.
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2018, Vol. 32 
