Stabilized hydraulic fluid

Details Stabilized hydraulic fluid Stabilized hydraulic fluid

1978-11-09

1979-12-18

Vaughn, Irving

Compositions

Electrolytes for electrical devices

252 325, 252 75, 252400A, C10M 148, C10M 146, C10M 342, C10M 340

Patent

active

041793846

ABSTRACT:
Mineral oil or synthetic hydrocarbon base hydraulic fluids containing a zinc bis(dialkyldithiophosphate) as an antiwear agent are stabilized against degradation at elevated operating temperatures by the incorporation in the hydraulic fluid of an appropriate Group I or Group II metal phosphonate. For example, a hydraulic fluid containing a zinc bis(dialkyldithiophosphate) is stabilized by the presence of a minor amount of a sodium phosphonate.

REFERENCES:
patent: 3496104 (1970-02-01), Shimada et al.
patent: 3652410 (1972-03-01), Hollinghurst et al.
patent: 3779928 (1973-12-01), Schlicht
patent: 3798162 (1974-03-01), Dickert et al.
patent: 3843530 (1974-10-01), Niedzielski
patent: 3927232 (1975-12-01), Dickert et al.

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