Effect of technology of obtaining on the properties of dry water fire extinguishing powder with sodium bicarbonate

Dry water can be classified as an effective and environmentally safe means of extinguishing fire. Dry water is formed by high-speed mixing of hydrophobic fumed silica and water, resulting in a coating of silica nanoparticles on the water droplets. At high temperatures, the silica shell is destroyed and finely dispersed water is released for extinguishing the fire. The article studies the effect of the technology of obtaining dry water material from hydrophobic methylsilica, water and the addition sodium bicarbonate of various concentrations on the texture and properties of the of the resulting dry water powder. Dry water fire extinguishing powder was obtained by mixing the components at the speed of 15,000 rpm for 10 s. Samples were made containing 10 wt. % methyl silica 2; 4; 6; and 8 wt. % sodium bicarbonate and the appropriate concentration of water. Adding 2 and 4 wt. % NaHCO3 to preliminarily prepared dry water results in a cream-like material; at concentrations of 6 and 8 wt. % the formation of a two-phase system - of a suspension of methyl silica in water and an aqueous solution of sodium bicarbonate is observed. When adding an aqueous solution of NaHCO3 with a concentrati