METHOD OF DETERMINING RATIO BETWEEN PRODUCTS OF THERMAL DECOMPOSITION AND EVAPORATION OF LUBRICATING OILS DURING THERMOSTATING Russian patent published in 2021 - IPC G01N33/30 

FIELD: test technology.

SUBSTANCE: invention relates to lubricant oils testing technology and can be used for evaluation of temperature resistance. Method comprises sampling oil, dividing it into equal parts, each of them is heated at atmospheric pressure without air access with condensation of vapors and discharge of condensate, wherein for each subsequent portion of the oil sample, the test temperature is increased by a constant value. After each constant time of temperature control at each temperature sample is weighed, weight of evaporated lubricating oil is determined, part of thermostatic sample is selected for direct photometry and determination of optical density, calculating the amount of heat energy absorbed by products of temperature destruction Q_D and weight of evaporated oil Q_G, as product of temperature for the time of thermal conditioning and, respectively, on optical density or weight of the evaporated oil. Calculating decimal logarithms of heat energy absorbed by products of thermal destruction of IgQ_D and evaporation of lgQ_G, plotting the decimal logarithm of heat energy absorbed by products of thermal decomposition, of the decimal logarithm of heat energy absorbed by the evaporation products, from which the ratio between thermal energies absorbed by products of thermal destruction lgQ_D and evaporation lgQ_G is determined, by rate of change of heat energy lgQ_D and beginning of its change by value of decimal logarithm of heat energy absorbed by mass of evaporated oil.

EFFECT: higher information value and reliability of determination.

1 cl, 1 ex, 1 dwg