TITLE:
Influences of SiO2/Na2O Molar Ratio on Aging and Chemical Modification of Water Glass
AUTHORS:
Huan Yang, Hailan Xu, J. Kriss Frank, Guangtong Xu, Weiwei Huan, Chaoying Ni, Yuxiang Yang
KEYWORDS:
Water Glass, Modulus, Polymerization Mechanism, Chemical Modification, TMS-GC Method
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.6 No.2,
April
27,
2016
ABSTRACT: In this paper, the content of water glass before and after adding modifying agent was measured by Trimethylsilyl-gas-chromatography. The experimental results showed that different modulus of water glass could generate different content of mono-silicate acid and oligomeric silicate acid in water glass. After a period of storage, different modulus of water glass led to decrease of silicate content at different levels. Because higher content of Na2O in water glass tended to incur the alkaline polymerization, the occurrence of depolymerization of silicate species would lead to an increase of oligomeric silicate species, resulting in a drawback of silicate species content after a period of storage. And contrary to that, lower content of Na2O in water glass tended to incur the acidic polymerization. When the modifying agent was added to the newly made water glass, the amount of mono-silicate acid and oligomeric silicate acid also decreased. In modified water glass, the change of each silicate acid species was less than that in unmodified water glass. These results showed that the modifying agent retarded the aging of water glass. It had remarkable significance on the theory and practical application of water glass chemistry.