Characteristics and Applications of Stearic Acid
Stearic acid: Also known as octadecanoic acid, is a long-chain fatty acid that is a white solid or powder that is odorless and tasteless.
Basic Information
Chemical structure：Stearic acid is a saturated fatty acid with a chemical formula of C18H36O2 and a molecular weight of 284.48.
Physical properties：It is a white waxy solid or slightly yellow waxy solid at room temperature and pressure. It can be dispersed into powder and has a slight smell of butter.
Chemical properties：Stearic acid has the chemical properties of general carboxylic acids and can react with magnesium ions and calcium ions to produce magnesium stearate and calcium stearate (white precipitate).
Solubility：Stearic acid is insoluble in water, but soluble in organic solvents such as ether, petroleum ether and benzene.
CAS: 57-11-4
HS Code: 38231100
Oiliness Agent：
Stearic acid can be used as an oiliness agent. It is composed of long-chain molecules with very strong polarity. It can form an adsorption film on the friction surface and play an anti-wear and friction-reducing role under boundary lubrication conditions.
Anti-wear properties：
Adding stearic acid to lubricating oil can reduce direct contact between metal parts and reduce wear.
Demulsification performance：
Stearic acid helps improve the demulsibility of lubricants, allowing them to better maintain their properties when in contact with water.
Cleaning and dispersing：
Stearic acid helps disperse and suspend contaminants in the oil, keeping the lubricant clean.
Improve thermal stability：
Stearic acid can maintain the stability of lubricating oil performance under high temperature environment and reduce the evaporation and deposition of lubricating oil.
Corrosion inhibitors：
Stearic acid can provide some corrosion protection against corrosion of metal surfaces.
Application of stearic acid in lubricating oil
Engine oil：Stearic acid can be used as an additive for engine oil to improve its adhesion and heat resistance. In high-speed engine movement and high-temperature environments, stearic acid can maintain the stability of engine oil performance and reduce wear and oxidation of the engine oil.
Wheel oil：Stearic acid can improve the adhesion and heat resistance of wheel hub oil. Under high-speed rotation and high-temperature environment, stearic acid can maintain the stability of wheel hub oil performance and reduce the wear and oxidation of wheel hub on wheel axle.
Industrial gear oil：As an additive for industrial gear oil, it improves the adhesion and wear resistance of gear oil. In harsh environments such as high-speed operation, high temperature, and high load, stearic acid can maintain the stability of the performance of industrial gear oil and reduce the friction, wear, and deformation of gears on gear shafts.
