METHOD OF ESTIMATING HYGROSCOPICITY OF AVIATION SYNTHETIC OILS Russian patent published in 2006 - IPC G01N33/28 

FIELD: lubricants.

SUBSTANCE: invention relates to the field of testing petroleum derivatives, in particular to testing hygroscopicity of aviation synthetic oils, and can be utilized in institutions engaged in development and application of lubricating oils for aircraft techniques and for estimating changes in quality conditions of aviation synthetic oils from tendency of oils to water absorption under operation conditions. In a method of estimating hygroscopicity of oils from amount of absorbed water, including sampling oil, keeping sample at specified relative humidity and temperature in presence of distilled water, and then calculating amount of absorbed water using thus obtained dependence, additionally calculating content of water in initial sample (C₀), specifying keeping time (t) for sample of oil at specified relative humidity and temperature, and calculating amount of absorbed water (C₁) in oil sample from mathematic dependence taking into consideration experimentally found maximum water solubility constant (C_max) and constant coefficient (k_a) for particular kinds of aviation synthetic oils.

EFFECT: reduced determination time and labor expenditure for determination, increased sensitivity of method under oil operation conditions without losses in accuracy and reproducibility.

1 dwg, 3 tbl