Here are several production methods for calcium stearate

Stearic acid is a common long-carbon chain saturated fatty acid. It has both the lipophilic end of the long carbon chain and the hydrophilic end of the carboxyl group. The surface of nano calcium carbonate is hydrophilic, so stearic acid is coated on the nano The surface of calcium carbonate can greatly improve its lipophilicity. When it is filled in rubber, plastics, advanced inks, and coatings, its large specific surface area and high specific surface energy are beneficial to the relationship between calcium carbonate particles and organic polymer molecules. The strong bond between them can make the surface of the product bright and have excellent reinforcement performance.

Calcium stearate is a white powder, insoluble in water, cold ethanol and ether, soluble in organic solvents such as hot benzene, benzene and turpentine, and slightly soluble in hot ethanol and ether. It decomposes slowly when heated to 400degC and is combustible. It decomposes into stearic acid and corresponding calcium salt in case of a strong acid, which is hygroscopic.

Four production methods for calcium stearate

1. The synthesis of calcium stearate. The calcium chloride solution with a content of 1074kg/m3 (10degBe) is added to the sodium stearate solution prepared above, and the metathesis reaction is carried out at about 65degC. The product calcium stearate is Precipitation separates out. Then it is filtered, washed with water and dried at about 90degC to obtain the finished product.

2. Suspend 5.60g (0.1mol) calcium oxide in 300mL, 55 hot water. Then dissolve 51.3g of chemically pure stearic acid in 350mL of hot water at 70, add 0.75g of diethanolamine and stir to emulsify it. The prepared stearic acid emulsion was gradually added to the calcium oxide suspension within 2h, and fully stirred, the formed white insoluble matter, namely calcium stearate, was filtered out and dried to obtain the product.

3. Directly add a certain amount of stearic acid and CaO to a reaction pot equipped with a stirrer and a thermometer, heat it to melt, slowly add the catalyst H2O2 under constant stirring, and apply a vacuum to control the reaction temperature at 140-150. The reaction time is 1.5~2.0h. After the reaction is completed, the material is discharged, cooled and crushed to obtain the product.

4. Metathesis method: dissolve stearic acid in 20 times the mass of hot water, add saturated caustic soda solution, and carry out saponification reaction at about 75degC to generate dilute sodium stearate solution. Then the calcium chloride solution with a content of 1074kg/m3 was added to the sodium stearate solution, and the metathesis reaction was carried out at about 65, and the product calcium stearate was precipitated out. Then it is filtered, washed with water and dried at about 90degC to obtain the finished product.

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