METHOD FOR DETERMINING pour point of mineral engine oils for automotive technology

摘要

A method of determining pour point of mineral motor oil for motor vehicles, comprising sampling and subsequent measurement value temperature dependent physical parameter during solidification of the sample, characterized in that the carried construction of calibration curve corresponding to function pour point of known concentration depressant PMA "D", specify the minimum the permissible value of the pour point of mineral bases engine oil, measure the optical density of sample naliziruemogo oil absorption on 1731 media 2000 cm bands calculated difference between the optical densities at these bands, the concentration depressant PMA "D" by the following relationship: where C - the concentration of additive wt%; ΔD = DD- difference between the optical densities; D-. optical density of the absorption band 1731 cm; D- optical density of the absorption band 2000 cm; K = 0,024 - constant experimentally obtained coefficient K = 0.0616 - experimentally derived constant coefficient, then a calibration graph are SAG temperature yvaniya corresponding calculated value of concentration depressant PMA "D" is summed with the obtained temperature value predetermined minimum allowable value of the pour point of mineral bases engine oil and the result is taken as the pour point analyte mineral motor oil.