Abstract

Sodium methyl siliconate, CH 3Si (OH) 2ONa, forms gels, when mixed with solutions of acetic, hydrochloric, or tartaric acid. Compared to sodium silicate and acid sols, which set to form silicic acid gels over a wide range of pH, from about 0 to 11, the siliconate and acid mixtures gel only in the range of pH 10.5 to 11.2, and only in solutions of fairly high concentrations. The energy of activation of setting of siliconate gels varies between 19,000 and 20,000 cal., compared to 24,000 cal. for alkaline gels of silicate and phosphoric acid. Viscosity versus time curves resemble those with silicate. The electrical conductivity of the siliconate gels increases more as the gel sets than is the case with silicate gels, representing a structure of lower resistance. The siliconate condensation polymers are the type intermediate between the polysilicic acids and the polysiloxanes. The siliconate gels are softer and more cloudy than silicic acid gels.

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