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.
