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

doi:10.11896/j.issn.1005-023X.2018.24.010

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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.

Key words： water glass polymerization precipitation mechanical strength water resistance

Published: 23 January 2019

CLC number:	TQ17
	O69

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	Articles by authors
	LI Maohong
	WEN Jing
	LI Yirui
	QU Shuxin
	ZENG Xiaohui
	WANG Ping

Cite this article:

LI Maohong,WEN Jing,LI Yirui, et al. Improving the Performance of Water Glass Used in the High-speed Rail Slab Coating by the Synergistic Effect of Controlling Polymerization and Precipitation[J]. Materials Reports, 2018, 32(24): 4264-4268.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.010 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4264

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