Enamel water density

Figure 32.2 Changes in the inorganic, water and organic matter content of enamel with density during maturation. The full lines represent Deakins original values ineluding his correction for carbonate. The dotted lines include an additional correction for 1-2% of bound water...

The saponification of organotriethoxysilane is carried out in enameled reactor 14 with an agitator and a water vapour jacket. First the reactor is filled from batch box 13 with 42% caustic soda and with a metered amount of water. After the dissolution is complete, the alkali solution receives organotriethoxysilane from batch box 12 at a temperature below 60 °C. The contents of the apparatus are agitated for 1 hour the mixture is sampled to determine the NaOFl content, solid residue and density. The prepared liquid is filtered through brass mesh in nutsch filter 15 into settling box 16. In the settling box the product is separated from mechanical impurities (it is settled for at least 24 hours), filtered in pressure filter 17 and poured into containers. 

The composition of enamel at the beginning and end of maturation is given in Table 32.2, while the values for inorganic matter, water and organic matter in various intermediate stages of maturation are plotted against density in Figure 32.2. 

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