Barium stearate, white or slightly yellow amorphous powder, melting point >225℃, stimulating effect on central nervous system, soluble in hot ethanol, benzene, toluene and other non-polar solvents, insoluble in water and ethanol. It is heated and dissolved in an organic solvent and becomes a gel when cooled, and is water-absorbent in the air. No sulfide contamination. When encountering strong acid, it decomposes into stearic acid and the corresponding barium salt.
The synthesis method of barium stearate is as follows:
1. Preparation of sodium stearate. Add stearic acid to the reaction kettle, stir with 20 Times (mass) of hot water is dissolved, and caustic soda with a content of 1074kg/m3 (10°Bé) is added at about 80°C to generate a dilute sodium stearate solution. Preparation of barium stearate: Add a barium chloride solution with a content of 1074kg/m3 (10°Bé) to the sodium stearate solution prepared above, conduct a metathesis reaction at about 70°C, and the product barium stearate precipitates out. After filtering, washing, and drying at 100 to 110°C, the finished product is obtained.
2. Suspend 48g of barium hydroxide [Ba(OH)2·8H2O] in 300mL of water at a temperature of 23°C. Then dissolve 95.3g stearic acid in 400mL water at 25°C, and add 4g ammonia water with a concentration of 28% to 29% to make an emulsion. Gradually add the stearic acid emulsion to the barium hydroxide suspension under full stirring within 1.5 hours. After obtaining a white insoluble product, filter it out and dry it to obtain the barium stearate product.
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