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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 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 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 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 2 hours, fully stirred. The white, insoluble material, which is calcium stearate was then filtered and dried.
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 1.5-2.0h. 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, which has a 1074kg/m3 content. A metathesis reaction takes place at 65 degrees Celsius, and precipitates the calcium stearate. 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, as a lubricant to release molds, and for plastic processing. 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.
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 can be used as a lubricant in polyolefins fibers and mold compounds, a grease thickener, a waterproofing material for textiles or paints, an agent to flatten paints and a plasticizer for plastic records. As a halogen absorbent for polyethylene and polypropylene, as well as a release agent and lubricant in thermosetting plastics like phenolic and amino; as a thickening and waterproofing agent in waterproof fabrics; as an agent to flatten paint; and as lubricant or pencil lead. 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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