Surface of coating material-sodium silicate powder
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Author : Lzh
Update time : 2023-02-16 15:41:13
What is sodium silicate powder? Sodium silicate powderhas strong adhesion, high strength, good acid resistance, heat resistance, poor alkali resistance, and water resistance. It loses 6 molecules of crystalline water when weathering. It is soluble in water, dilute sodium hydroxide solution, and insoluble in alcohol and acid. Its melting point is 1088. Low toxicity, LD50 (rats, oral) 1280mg/kg (excluding crystal water). It is stored in a cool and dry place. It is an acid oxide; the acid anhydride of silicic acid has stable chemical properties. It is insoluble in water, does not react with water, and does not react with ordinary acids. It can react with hydrogen fluoride gas or hydrofluoric acid to generate silicon tetrafluoride gas. Under normal temperatures, the strong alkali solution and sio2 slowly react to generate the corresponding silicate. The strong alkali solution can corrode the glass, so the glass bottle storing the strong alkali solution cannot use a ground glass stopper. If the glass stopper (containing sio2 in the glass) is used, it will generate sticky sodium silicate, binding the glass bottle stopper and the bottle mouth together. The glass bottle cannot be kept with concentrated alkali for a long time.
Preparation of sodium silicate powder The liquid caustic soda and silica sand are mixed in a proper proportion by wet method into the autoclave and heated by direct steam. After the pressure in the autoclave rises to 0.7~0.8Mpa, the steam connection is stopped. The Chemical book uses jacket steam for insulation, maintains this pressure, and reacts for several hours. The reactants are filtered and concentrated on producing water glass. Its 2NaO+nSiO2 → Na2O? nSiO2+H2O.
Use of sodium silicate powder 1. Brush the surface of the material to improve its weathering resistance with a density of 1.35g/cm ³ Water glass impregnated or coated with clay bricks, cement concrete, silicate concrete, stone, and other porous materials can improve the compactness, strength, impermeability, frost resistance and water resistance of materials 2. The reinforced soil injects water glass and calcium chloride solution into the soil alternately, and the generated silicic acid gel consolidates the soil under the humid environment because it absorbs the water in the soil in an expansive state 3. Prepare a quick-setting waterproof agent.
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