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Compatibility of motor materials with polyolester lubricants: effect of moisture and weak acids.

Author(s) : KUJAK S., WAITE T.

Summary

The paper discusses the effects of various levels of acid and moisture in a polyolester lubricant on the compatibility of motor insulation materials. Thirteen materials were exposed to R134a-polyolester lubricant combinations with four levels of acid and moisture for 500 hours at 127 deg C. The moisture levels were lower than 50 to 500 ppm and the weak acid levels were lower than 0.05 to 2 milligrams KOH/g. The acid levels of the lubricant were raised by the addition of organic acids that would be produced by hydrolysis of the polyolester lubricants. The results were compared to a R22-mineral oil exposure with the mineral oil containing a moisture level lower than 30 ppm and acid level lower than 0.01 milligrams KOH/g. Results indicated that a 500 ppm moisture level in the polyolester lubricant had a greater effect on the motor materials than a high acid level. However exposure to R134a-polyolester lubricant with a high moisture level had less effect than exposure to R22-mineral lubricant with a low moisture level.

Details

  • Original title: Compatibility of motor materials with polyolester lubricants: effect of moisture and weak acids.
  • Record ID : 1995-0791
  • Languages: English
  • Source: Proceedings of the 1994 International Refrigeration Conference at Purdue.
  • Publication date: 1994/07/19
  • Document available for consultation in the library of the IIR headquarters only.

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