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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 liquids. It can also be used as an adhesive, plastic additive, or waterproofing agent.
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 a sodium stearate preparation prepared earlier. Metathesis occurs at approximately 65degC. The calcium stearate product is separated by precipitation. The finished product is obtained after it has been filtered, washed in water and dried 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 of diethanolamine and stir it up. The prepared stearic-acid emulsion is added gradually within 2h to the suspension of calcium oxide, 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 with a stirring device and thermometer. Heat it until it melts. Slowly add the catalyst, H2O2, 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 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. The finished product is then filtered and dried between 90degC and water.
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 in rubber processing 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, lubricant or thickening for grease. Anticaking agents are made from food-grade Calcium Stearate.
Calcium stearate can also be used to make pencil lead and in medicine.
(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer of high-quality nanomaterials and chemicals with over 12 year’s experience. Boron Powder produced by our company is of high purity and has a low impurity level. Contact us if you need to.
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 a sodium stearate preparation prepared earlier. Metathesis occurs at approximately 65degC. The calcium stearate product is separated by precipitation. The finished product is obtained after it has been filtered, washed in water and dried 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 of diethanolamine and stir it up. The prepared stearic-acid emulsion is added gradually within 2h to the suspension of calcium oxide, 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 with a stirring device and thermometer. Heat it until it melts. Slowly add the catalyst, H2O2, 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 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. The finished product is then filtered and dried between 90degC and water.
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 in rubber processing 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, lubricant or thickening for grease. Anticaking agents are made from food-grade Calcium Stearate.
Calcium stearate can also be used to make pencil lead and in medicine.
(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer of high-quality nanomaterials and chemicals with over 12 year’s experience. Boron Powder produced by our company is of high purity and has a low impurity level. Contact us if you need to.