METHOD FOR DETERMINING OPTIMAL CONTENT OF DEPRESSOR ADDITIVE IN LUBRICANT COMPOSITIONS Russian patent published in 2016 - IPC G01N33/30 G01N25/02 

FIELD: chemistry.

SUBSTANCE: method includes the registration of processes of thermodynamic structure-transformation by the determination of the thermoenergetic function of each sample, several samples of oil with the different, exactly known quantity of a depressor additive in them are prepared, to determine the degree of intensity of the structure-transformation of each sample of the analysed oil the sample is continuously cooled with specified speed from room temperature to the temperature of freezing, temperature areas of the structure-transformation of the analysed oil are determined by dimensionless dynamic criterion of similarity of temperature-viscous properties η^δ, and the degree of intensity of the structure-transformation of the analysed oil in the mentioned temperature areas is quantitatively expressed through the change of the thermoenergetic function of the analysed oil E(T), determined by formula E(T)=(1/2-η^δ(T))·RT, where R is a universal gas constant; T is the current absolute temperature of oil; Θ is the speed of temperature changing; ; η is dynamic viscosity; η^δ=δη(T, Θ)/δT; then the average intensity of microstructure processes in each sample is determined through the standard deviation of the thermoenergetic function. The optimal content of the depressor additive is determined as corresponding to the sample with the maximal average intensity of microstructure processes.

EFFECT: increase of accuracy and reliability of determination.

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