Water glass aqueous solution, sodium silicate

Variations of Silica Sol Manufacturing Process. As shown in Figure 4, the four methods, A-l, A-2, B-l, and B-2, use different technical combinations of nucleation, particle growth, and concentration. In any of these methods the raw material aqueous water-glass solution is diluted, and sodium is removed with a cation-exchange resin to obtain an active silicic acid. The characteristics of these four processes are shown in Table I. 

Water glass Sodium silicate is the common name for a compound sodium metasilicate, Na2Si03, also known as water glass or liquid glass. It is available in aqueous solution and in solid form and is used in cements, passive fire protection, refractories, textile and lumber processing, and automobiles WAXS Wide angle X-ray scattering... 

For commercial silica gels, water glass Na2Si03 is used as a cheap silica source then, before the gelation step, sodium is ion-exchanged from the aqueous sodium silicate solution to get a silicic acid (Schwertfeger et al., 1998). 

A fortiori, in hydrated glasses, all the water is intimately linked to the silicic polyanions. These results make it easier to raderstand the impact of water quantity on the properties of sodium silicates in aqueous solution or in the washing medium. 

Sodium carbonate reacts with natural silica at high temperatures to produce sodium silicate (water glass). An aqueous solution of sodium silicate, when treated with an acid, will precipitate silica with a fine particle size when conditions are controlled properly. This hydrated precipitated silica is commonly used in rubber compounding to achieve a more resilient (lower energy loss during flexing) cured rubber and to achieve better adhesion of rubber to steel tire cord. 

Alkoxides are described in some literature as expensive educts prohibiting mass production. A solution to this problem is the use of cheaper raw materials such as water glass or sodium silicate (Na2 i03) for sihca [50], which is now used as general precursor for commercial aerogel synthesis for technical applications. A silica hydrogel is generated by acidification of the aqueous sodium silicate solution with e.g. HCl or H2SO4 [51,52]. 

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