Colorless orthogonal bipyramidal crystal or white to off-white block or powder. Can be weathered. Six molecules of crystal water were lost at 100 °C. Soluble in water, soluble in dilute sodium hydroxide solution, insoluble in ethanol and acid. Melting point 1088 ° C. Low toxicity, half lethal dose (rat, oral) 1280mg/kg (no crystal water).
2, physical and chemical properties
Strong adhesion, high strength, good acid resistance, heat resistance, poor alkali resistance and water resistance.
Analytical reagents, fire retardants, adhesives.
A. Applying the surface of the material to improve its weathering resistance. Impregnating or painting porous materials such as clay brick, cement concrete, Portland concrete, stone, etc. with water glass with a density of 1.35g/cm3 can improve the compactness and strength of the material. , impermeability, frost resistance and water resistance.
B. Reinforced soil The water glass and calcium chloride solution are alternately injected into the soil, and the generated silicic acid gel is in a humid environment, and the soil is in an expanded state due to absorption of soil moisture, thereby consolidating the soil.
C. Formulating a quick-setting waterproofing agent.
D. Repairing the cracks in the brick wall After the water glass, the granulated blast furnace slag powder, the sand and the sodium fluorosilicate are mixed in an appropriate ratio, they are directly pressed into the cracks of the brick wall to bond and reinforce.
E, sodium silicate aqueous solution can be used as the outer surface of the fire door.
F, can be used to make acid-resistant clay for the inner lining of the furnace. Physicochemical properties
G. Preparation of silica gel.