Polyol Phosphate Ester is a high-performance lubricant base stock with a unique set of properties that allow it to excel in a variety of applications. The following are some of the distinguishing features of Polyester Phosphate Ester:

  1. High temperature stability: polyester phosphate esters exhibit excellent stability at high temperatures and are suitable for use in high temperature operating environments such as aircraft turbine engines and high temperature gas turbines.
  2. oxidative stability: these esters have good oxidative stability, and can resist decomposition at high temperatures and in an aerobic environment, extending the service life of the lubricant.
  3. Low temperature fluidity: polyester phosphates maintain good fluidity at low temperatures, meaning they can be used in extreme low temperature environments without losing their lubricating properties.
  4. High Viscosity Index: Polyester phosphates have a high viscosity index, which means that their viscosity varies little with temperature, providing consistent lubrication over a wide range of temperatures.
  5. Extreme Pressure and Anti-Wear Properties: Polyester phosphates have good extreme pressure (EP) and anti-wear (AW) properties, which are effective in reducing wear on metal contact surfaces and preventing metal sticking under extreme conditions.
  6. Frictional properties: Due to the polarity of the ester molecule, polyester phosphates are able to reduce friction by adsorbing onto metal surfaces through van der Waals forces or chemical bonding.
  7. Environmental friendliness: many polyester phosphate esters have good biodegradability, low impact on the environment, in line with modern environmental requirements.
  8. Chemically stable: polyester phosphates have good resistance to hydrolysis, which means they retain their properties in wet environments.
  9. Synthesisability: polyester phosphates can be synthesised by esterification, using penta-polyethylene glycol, di-penta-polyethylene glycol and a variety of mono-saturated C5-C10 fatty acid blends as raw materials.
  10. Versatility: Polyester phosphates can be modified by changing the molecular structure to tailor their properties to meet the needs of specific applications.

These properties have led to a wide range of applications for polyester phosphate esters in aerospace, automotive, industrial machinery, hydraulic systems and lubricants. For example, MIL-PRF-23699G Enhanced Ester (EE) aviation turbine engine lubricants are based on polyester phosphate esters and require specific viscosity characteristics and very low pour points to ensure performance at extreme temperatures. In addition, polyester phosphate esters are used to develop environmentally friendly/biodegradable lubricants that have a low environmental impact.

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