Calcium stearate and its application


Jul 1, 2023

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What is Calcium Stearate? Calcium stearate has a molecular structure of C36H70CaO4. It’s a white powder that is not soluble in water. This compound can be used to waterproof, lubricate, or add plastic.
Calcium stearate (also known as calcium oxide or stearic salt) is a common calcium salt found in food, cosmetics and plastics. The use of calcium stearate is not without its pros and cons.
Synthesis and use of Calcium Stearate
1. The synthesis is calcium stearate. The sodium stearate and calcium chloride solutions are mixed together at a temperature of 65degC. The calcium stearate product is separated by precipitation. The finished product is obtained after it has been filtered, washed in water, and then dried at around 90degC.
2. In 300mL hot water at 55degC, dissolve 5.60g of calcium oxide (0.1mol). Pour 51.3g stearic acetic acid, which is chemically pure, in 350mL water heated to 70degC. Add 0.7g diethanolamine and stir it until it emulsifies. The prepared stearic-acid emulsion is added to the suspension of calcium oxide within 2h and thoroughly stirred. After that, the white, insoluble material, which is calcium stearate was filtered and dried.
3. Direct method: Add a certain quantity of stearic acids and CaO in a pot with a stirring device and thermometer. Heat it to melting, then add the catalyst slowly under constant stirring. Apply a vacuum for controlling the reaction temperature to 140-150degC. The reaction lasts 1.52.0h. After the reaction has been completed, the material must be discharged, cooled down, and then crushed to produce the product.
4. Metathesis method – Dissolve the stearic solution in 20 times as much hot water. Add caustic soda saturated solution. Perform saponification at approximately 75degC. This will generate a dilute sodium stearate. The sodium stearate is then mixed with the calcium chloride solution containing 1074kg/m3. Metathesis is carried out around 65 degrees Celsius, and calcium stearate is precipitated. The product is dried, washed, and filtered at around 90degC.

Calcium stearate applications
Calcium stearate has many uses, including as a heat stabilizer for polyvinylchloride, a lubricant used in plastic processing, or a mold release. When mixing lead soap with basic salt, it can accelerate the gelation process.
The non-toxic film and appliance, such as medical equipment and food packaging, also uses calcium stearate. Calcium stearate may also be used in polyethylene or polypropylene as a halogen-absorbing agent to reduce the harmful effects of residual catalyst on color stability and durability.
Calcium stearate can be used as a rubber plasticizer to soften rubber. It has little or no effect on rubber vulcanization. It is used in the production of plastic records as a plasticizer, a lubricant, and to thicken grease. As a halogen absorbent for polyethylene and polypropylene. Also used as a release agent and lubricant in thermosetting plastics like phenolic, amino and thickening agents for grease. Anticaking agents are made from food-grade Calcium Stearate.
Calcium stearate can also be used to make pencil lead and in medicine.

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