FORECASTING METHOD OF THERMO-OXIDATIVE STABILITY OF LUBRICANT MATERIALS Russian patent published in 2019 - IPC G01N33/30 

FIELD: measurement technology.

SUBSTANCE: invention relates to technology of determining indicators of thermal oxidative stability of lubricants. To achieve technical result, disclosed is a method for predicting values of thermal oxidative stability of lubricants, in which a heated lubricant sample is tested in the presence of air with mixing constant weight for a period of time, and at regular intervals of time an oxidised lubricant sample is sampled and an oxidation process is evaluated. According to the invention, in order to predict the values of thermal oxidative stability while increasing the time for testing the lubricant at the selected temperature, using the results obtained at least three identical time intervals, calculating the amount of heat energy absorbed by the oxidation products, the evaporation products, and total absorbed heat energy during the lubricant temperature control, the amount of heat energy is determined by the product of the temperature value for the test time and the value of the thermo-oxidative stability value, calculating logarithm of absorbed heat energy by each indicator of thermal-oxidative stability for at least three selected intervals of test time, plotting graphical dependencies of decimal logarithm of absorbed heat energy by each indicator of thermal-oxidative stability on decimal logarithm of test time, on which values of optical density, volatility and thermal oxidative stability coefficient are predicted with increase in test time interval.

EFFECT: technical result consists in reduction of labor intensity due to reduced time of testing at selected temperature in connection with possibility to use results obtained at three identical time intervals, and possibility of forecasting with obtaining of values of parameters by calculation method.

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