Barium stearate is a white light powder with a specific gravity of 1.145. It is insoluble in water and soluble in hot ethanol. When exposed to strong acid, it decomposes into stearic acid and the corresponding barium. Salt is hygroscopic.
The preparation method of barium stearate is as follows:
1. The reaction between stearic acid and barium carbonate or barium hydroxide, or sodium stearate The solution is prepared by reacting with dilute barium chloride solution.
2. It is prepared by reacting stearic acid with sodium hydroxide solution and then reacting with barium chloride solution.
3. Preparation of sodium stearate. Add stearic acid to the reaction kettle, dissolve it with 20 times (mass) hot water under stirring, and add caustic soda with a density of 1074kg/m3 at about 80°C. A dilute sodium stearate solution is produced.
4. Preparation of barium stearate. Add a barium chloride solution with a density of 1074kg/m3 to the sodium stearate solution prepared above, and conduct a metathesis reaction at about 70°C to produce barium stearate. Precipitate out. After filtering, washing, and drying at 100 to 110°C, the finished product is obtained.
5. 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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