Calcium stearate and its application

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What is Calcium Stearate? Calcium stearate has a molecular structure of C36H70CaO4. It’s a white powder that’s insoluble in liquid. It can also be used as a plastic additive, lubricant or waterproofing agent.
Calcium stearate (also known as calcium oxide or calcium stearate) is a calcium-based salt that’s derived from stearic and calcium oxide. It is often 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. Synthesis of Calcium Stearate. The sodium stearate and calcium chloride solutions are mixed together at 65degC. Precipitation separates calcium stearate. 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 55 degrees Celsius, dissolve 5.60g calcium oxide (0.10mol). Pour 51.3g of chemically-pure stearic acids in 350mL water heated to 70degC. Add 0.7g of diethanolamine and stir it up. The prepared stearic-acid emulsion, after being fully stirred for 2 hours, was slowly added to the suspension of calcium oxide.
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 while constantly stirring. Apply a vacuum for the temperature to be controlled at 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 final 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. Then, the calcium chloride with a 1074kg/m3 content was added to sodium stearate, the metathesis reaction took place at 65degC and the calcium stearate product was precipitated. Then, it is filtered and washed in water before being dried 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 lead salt, the gelation speed can be increased.
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 in rubber processing to soften rubber. It has a minimal effect on vulcanization. It is used in the production of plastic records as well as a lubricant, waterproofing agent, paints flattening agent, and thickening agent. 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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