METHOD FOR DETERMINING THE RATIO BETWEEN OXIDATION AND EVAPORATION PRODUCTS OF LUBRICATING OILS DURING THERMOSTATING Russian patent published in 2021 - IPC G01N25/02 G01N25/12 G01N33/30 

FIELD: liquid lubricants.

SUBSTANCE: invention relates to a technology for assessing quality of liquid lubricants. Disclosed is a method for determining the ratio between the products of oxidation and evaporation of lubricants during thermostating, in which a sample of a lubricating oil of constant mass is tested in the presence of air with stirring at least at three temperatures, and at regular intervals the samples are weighed, the mass of the evaporated lubricating oil is determined, and a part of the oxidized oil is taken for photometry and optical density determination. Calculate the amount of thermal energy absorbed by the oxidation products Q_D and the mass of the evaporated oil Q_G as the product of the temperature and the oxidation time and, accordingly, the optical density D or the mass of the evaporated lubricating oil G. Calculate the decimal logarithms of the thermal energy absorbed by the oxidation products IgQ_D and evaporation lgQ_G, plot the graphical dependence of the decimal logarithm of the thermal energy absorbed by the oxidation products on the decimal logarithm of the thermal energy absorbed by the mass of the evaporated oil, and the ratio between the thermal energies absorbed by the oxidation products lgQ_D and evaporation logQ_G is estimated by the rate of change of the heat energy IgQ_D and the beginning of its change by the decimal value logarithm of thermal energy absorbed by the mass of evaporated oil.

EFFECT: invention is aimed at increasing the information content of the quality assessment method by comparing lubricating oils by the amount of thermal energy absorbed by the products of oxidation and evaporation, the rate of the ratio of these energies and determining the onset of oxidation processes.

1 cl, 1 dwg