What are the organophosphorus antiwear agents

Phosphorus-containing compounds can improve the anti-wear properties of lubricating greases. Although the load-bearing capacity of acidic phosphates is stronger than that of neutral phosphates, acidic phosphates have strong chemical activity and are easy to cause metal corrosion, so they are rarely used. The most commonly used ones are tricresyl phosphate ester, triphenyl phosphate, triethyl phosphate, tributyl phosphate and di-n-butyl phosphite, etc.

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Tricresyl phosphate, light yellow oily liquid, toxic, freezing point -35°C. Insoluble in water, soluble in alcohol, ether, benzene and other organic solvents, with flame retardancy and good anti-wear performance, often used with other extreme pressure Additives are used together to enhance extreme pressure and anti-wear performance. The amount added is generally 0.5%--5%.
Di-n-butyl phosphite is a colorless and transparent liquid, insoluble in water, and has acidity. During use, an appropriate amount of alkaline antirust agent can be added to overcome the corrosion of metals. It is often used in combination with sulfur-containing extreme pressure additives to enhance Extreme pressure anti-wear effect.
Triphenyl phosphate, white or yellowish needle-like crystal, with aromatic odor and poisonous, insoluble in water, slightly soluble in alcohol, soluble in benzene, chloroform and acetone, and soluble in vegetable oil. It is mainly used as a flame retardant plasticizer for cellulose. When used as an anti-wear additive for lubricating grease, the addition amount is generally 0.5%-1%.

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