PMA Viscosity index improver
Time：
2025-11-07
PMA Viscosity index improver
Viscosity index improver
Viscosity index improvers (VII) refer to additives that improve the viscosity-temperature properties of lubricating oils, i.e., increase the viscosity index of the lubricating oil. We know that lubricating oils with a higher viscosity index can maintain good performance under both low and high temperature conditions. Additives that can increase the viscosity index of lubricating oils are called viscosity index improvers.
Viscosity index improvers are generally high MW polymers, mainly including polyisobutylene (PIB), olefin copolymers (OCP), hydrogenated styrene-diene copolymers (HSD), and polymethacrylate(PMA).
Polymethacrylate(PMA)
Currently, PMA is the mainstream viscosity index improver, characterized by excellent low-temperature performance, making it suitable for most lubricating oils; it effectively increases the viscosity index, resulting in better high-temperature performance of lubricating oils, and has good oxidation stability.
Polymethacrylate(PMA) is produced by reacting methacrylamide with water to generate methacrylic acid. Under the action of polymerization inhibitors and catalysts, methacrylic acid is esterified with higher alcohols to generate methacrylate. After purification to remove byproducts, it undergoes a polymerization reaction through the action of an initiator to produce polymethacrylate.
PMA's superior performance makes it suitable for use in engine oils, gear oils, and hydraulic oils, as well as gasoline engine oils, CNC hydraulic oils, and automatic transmission fluids.
Polymethacrylate (PMA) can also be used as a pour point depressant.
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