It is a common saturated long-chain fatty acid. The hydrophilic carboxyl group and the lipophilic carbon chain end are both present in the stearic acid. The surface is hydrophilic of the nano-calcium carbonate, so it is coated with stearic acids to increase its lipophilicity. The large surface area of the calcium carbonate and its high specific energy can be beneficial when it is used in rubber, plastics or advanced inks. The bond between the two can enhance the performance of the product and make it brighter.
Calcium stearate, which is white, is insoluble with water, cold alcohol and ether. It's soluble, however, in organic solvents, such as hot benzene. It is combustible, and it decomposes very slowly at 400degC. If a strong acid is used, it will decompose into stearic acids and the calcium salts.

Four different production methods for Calcium Stearate

1. The synthesis is calcium stearate. The sodium stearate and calcium chloride solutions are mixed together at a temperature of 65degC. Precipitation separates calcium stearate. Then, it is filtered and washed in water before being dried at 90degC.

2. In 300mL hot water, add 5.60g of calcium oxide (0.1mol). Pour 51.3g of chemically-pure stearic acids in 350mL at 70°C hot water, and add 0.75g ethanolamine. Stir to emulsify. The prepared stearic-acid emulsion, after being fully stirred for 2 hours, was slowly added to the suspension of calcium oxide.

3. The catalyst H2O2 is added slowly under constant stirring to the reaction pot. The reaction lasts 1.52.0h. The reaction is complete when the material has been discharged and cooled.

4. Metathesis method: Dissolve stearic acids in 20 times more hot water. Add saturated caustic soda solution. Perform saponification reactions at around 75degC. Then the sodium chloride solution was mixed with the calcium-chloride solution containing 1074kg/m3. Metathesis reaction took place at 65 degrees Celsius, and then the product calcium stearate is precipitated. The finished product is then filtered and washed in water before being dried at around 90degC.
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