In the future, the functional diversification of poly(methyl methacrylate) lubricant additives may involve compounding with poly-α-alkenes, di-tert-butyl diphenylamine, phosphate esters, etc. The details are as follows:
(1) Poly-α-alkenes
Although poly(methyl methacrylate) has good viscosity index improvement and other effects, its single use has insufficient strength in the oil film. Poly-α-alkenes have excellent shear resistance and good viscosity-temperature characteristics. When compounded with poly(methyl methacrylate), it can effectively compensate for the weak oil film retention ability of poly(methyl methacrylate), enhance the oil film strength of the oil product, and further improve the viscosity index and shear stability. It is suitable for lubricants in vehicle transmission systems and other lubricants with higher requirements for oil film strength.
(2) Di-tert-butyl diphenylamine
Di-tert-butyl diphenylamine is a commonly used antioxidant, which can effectively inhibit the oxidation reaction of lubricating oil and extend the service life of the lubricating oil. When poly(methyl methacrylate) is compounded with di-tert-butyl diphenylamine, it can improve the viscosity-temperature performance of the lubricating oil while enhancing its antioxidant performance, reducing the formation of oxidation products, maintaining the cleanliness of the lubricating oil, and reducing equipment wear. It is suitable for fields with high requirements for oxidation stability, such as engine oils.
(3) Phosphate esters
Phosphate esters are extreme pressure anti-wear agents that can form a protective film on the metal surface under high-load conditions, reducing friction and wear. When poly(methyl methacrylate) is compounded with phosphate esters, it can provide better extreme pressure anti-wear performance on the basis of good viscosity-temperature performance, suitable for industrial gear oils, hydraulic oils, etc. that need to withstand high loads, effectively protecting gears, hydraulic components, etc., reducing wear, and improving the reliability of equipment operation.
(4) Cyclopropane carboxylic acid
Cyclopropane carboxylic acid can significantly reduce the friction coefficient and reduce friction wear under high load conditions, and has good stability. When compounded with poly(methyl methacrylate), it can prepare a green and sulfur-free lubricant additive, suitable for scenarios with high environmental protection requirements and those that need to cope with high-load conditions, such as the lubrication systems of some new energy vehicles.
