Calcium Stearate: A Versatile Compound
Introduction
Calcium stearate, with the chemical formula C36H70CaO4, is a white powder that plays various roles in industrial applications. In this article, we’ll explore its properties, production methods, and diverse uses.Get more news about Calcium Stearate,you can vist our website!
Properties
Appearance: White solid
Density: 1.08 g/cm³
Melting Point: 147-149°C
Boiling Point: 359.4°C
Solubility: Insoluble in water; does not lather well.
Production Methods
Precipitation Method:
Calcium stearate is synthesized by adding a calcium chloride solution (density 1074 kg/m³) to a sodium stearate solution at around 65°C. The resulting calcium stearate precipitates as a white solid, which is then filtered, washed, and dried.
Direct Method:
Calcium oxide (CaO) is suspended in hot water, and stearic acid is dissolved in another hot water solution. The stearic acid emulsion is gradually added to the calcium oxide suspension, resulting in calcium stearate. After filtration and drying, the product is obtained.
Decomposition Method:
Stearic acid is saponified with a saturated sodium hydroxide solution to form sodium stearate. Calcium chloride is then added to the sodium stearate solution, leading to the precipitation of calcium stearate. Filtration and drying yield the final product.
Applications
Plastics Industry:
Used as a heat stabilizer for polyvinyl chloride (PVC) and a lubricant in plastic processing.
Enhances gelation speed when combined with basic lead salts.
Food Packaging and Medical Devices:
Used in non-toxic flexible films and utensils.
Rubber Processing:
Acts as a plasticizer for natural and synthetic rubber.
Textile Industry:
Used as a waterproofing agent.
Paints and Coatings:
Provides a matte finish.
Other Uses:
Absorbs halogens in polyethylene and polypropylene.
Lubricant for polyolefin fibers and molded plastics.
Anti-caking agent in food-grade applications.