Temperature Dependence of Dynamic Viscosity and DSC Analysis of the Plantohyd samples Teplotná závislosť dynamickej viskozity a DSC analýza vzoriek Plantohydu

The present work deals with physical properties – dynamic viscosity and DSC analysis of biodegradable hydraulic fluids and lubricating oils based on vegetable oils or on synthetic esters – PLANTOHYD S series (15S, 46S) and PLANTOHYD N series (40N). The brief characterization of investigated material is presented. This article presents the experimental results of measuring the main rheological characteristic – dynamic viscosity of samples of Plantohyd. Measurements were made under laboratory conditions with digital viscometer DV-3P Anton Paar. Examination of the dynamic viscosity in the temperature interval from -10 °C to 50 °C was made. The exponential dependency of viscosity on the temperature for the each sample was obtained in accordance with Arrhenius equation. DSC (Differential Scanning Calorimetry) analysis providing information on thermal effects in the sample subjected to the temperature programme was realised in the temperature range from -30 °C to 100 °C by using differential scanning calorimeter DSC 822e METTLER TOLEDO. It was determined endo/exo thermal effects and temperature interval with no thermal effects for each sample of Plantohyd.