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What is Calcium Stearate?
The organic compound calcium stearate has a formula molecular 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 calcium chloride with a concentration of 1074kg/m3 (also known as 10degBe), is added to the sodium-stearate solution, and the metathesis reactions are carried out at approximately 65degC. Precipitation separates the 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 55degC, dissolve 5.60g of calcium oxide (0.1mol). Pour 51.3g of chemically-pure stearic acids in 350mL water heated to 70degC. Add 0.7g 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 equipped with a stirring device and thermometer. Heat it until it melts. Slowly add the catalyst, H2O2, while constantly stirring. Apply a vacuum for controlling the reaction temperature to 140-150degC. The reaction lasts 1.5 to 2 hours. 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 and calcium chloride solutions were then combined. Metathesis reaction took place at approximately 65 degrees Celsius, and calcium stearate 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 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.
In rubber processing, calcium is used to soften rubber. It can be used on both natural and synthetic, but it does not affect vulcanization. It is used in the production of plastic records as a plasticizer, a lubricant, a thickening and waterproofing agent, and a coating 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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