Sodium orthosilicate → APB silicate

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Reaction Steps

In the film-forming system that we have found of particular advantage in carrying out our invention comprising a homogeneous solution of sodium silicate and a polysalt, the ratio of a polysalt solids to silicate solids should be between 0.02/1.0 and 3.0/1.0. If a solution of ammonium pentaborate and sodium silicate is used the solids would be 5 to 35% with 3 to 15% ammonium pentaborate (APB) with a ratio of APB solids to sodium silicate solids between 0.03:1 and 0.5:1 and preferably 0.06:1 and 0.5:1. Therefore the suspension-solution using such a film-forming system would have the following composition. The total solids (film-forming + particulate) are 5.25 to 68%, the dissolved film-forming solids (APB + silicate) are 5.0 to 34.5% with 2.4 to 12% dissolved APB solids, and the suspended particulate solids are 0.25 to 51.2%. A system including sodium pentaborate (SPB) would have a ratio of SPB solids to sodium silicate between 0.02:1 and 0.3:1 and the suspension-solution would have the following composition. The total solids (film-forming + particulate) are 18.2 to 68%, the dissolved film-forming solids (SPB + silicate) are 17.4 to 34.5% with 6 to 7% SPB and the suspended particulate solids is 0.9 to 51.2%. A system with sodium hexametaphosphate (SHP) would have a ratio of SHP solids to sodium silicate solids between 1:1 and 3:1 and the suspension-solution would have the following composition. The total solids (film-forming + particulate) are 31 to 80%, the dissolved film-forming solids (SHP + silicate) are 29.6 to 48% and the suspended particulate solids are 1.5 to 60%.

Provenance & Evidence