Film-Forming Properties of Polyol Esters, Polyphenyl Ethers and Their Mixtures Over a Wide Range of Temperature

Abstract

There is a growing interest in lubrication at very high temperature and in the development of synthetic lubricants to satisfy the requirements of high temperature systems. Polyolesters, polyphenylethers and their mixtures which have excellent stability at high temperature are possible candidates. In this study, the film-forming properties of these fluids were investigated over a wide range of temperature, from 40° to 240°C. As a result the following findings were made.

The effective pressure-viscosity coefficients and thus elastohydrodynamic film-forming properties of PPEs are, on the whole, greater than those of POEs. Considering mixtures of POE and PPE, both thermo-oxidative stability and film forming properties can be improved by the addition of PPE to POE. Mixture of R4P2E and POE result in the effective improvement of thermo-oxidative stability as well as effective pressure-viscosity coefficient and are thus good candidates for high temperature usage. A good correlation between the effective pressure-viscosity coefficient and viscosity was also found

Presented as a Society of Tribologists and Lubrication Engineers Paper at the STLE/ASME Tribology Conference in Orlando, Florida, October 11–13, 1999

KEY WORDS:

• Polyolester
• Polyphenylether
• Film-Forming Properties
• High Temperature
• Pressure-Viscosity Coefficient

Notes

Presented as a Society of Tribologists and Lubrication Engineers Paper at the STLE/ASME Tribology Conference in Orlando, Florida, October 11–13, 1999