DEVELOPMENT OF THE LUBRICITY ADDITIVE TO LOW-SULPHUR DIESEL FUELS BASED ON THE TECHNICAL ALKYLSALICYLIC ACIDS

For the first time a high efficiency of the technical alkylsalicylic acids asa basis of the lubricity additive to low-sulfur diesel fuel is established. Theoptimum compounding and method of obtaining the lubricity additive is developed. A representative sample of the lubricity additive obtained in the laboratory conditions. This the lubricity additive has passed tests for compliance withthe requirements of European safety criteria, according to GOST R 52368-2005(EN 590:2004), and in the frameworks of the Complex of qualifying estimationmethods for high-speed diesel engines.

Mechanisms of Lubricated and Unlubricated Friction and Wear

A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms. For lubricated tests a mixture of n-hexadecane (cetane) as base fluid and palmitic acid as lubricity additive was used. Experimental results, including results obtained by running unlubricated (dry) tests and results obtained from literature were all considered to formulate the hypothesis that a fully functional additive film will not survive the full duration of the lubricity test, which is 75 minutes [5]. Friction values obtained in the experiments conducted were much higher than what is expected for boundary films formed by long chain carboxylic acids. Comparable friction values were obtained in the first few seconds of the tests, but the friction values increased indicating the destruction of the boundary film. Metal oxide lubrication dominates for the remainder of the test.