Affiliation:
1. Cardinal Stefan Wyszynski University in Warsaw
2. Łukasiewicz Research Network – Institute for Sustainable Technologies
3. Kazimierz Pulaski University of Technology and Humanities in Radom
Abstract
The study aimed to confirm the hypothesis that aqueous solutions of polymers with surfactants meet the
criteria of ecological lubricant bases. An oat hydrolysate was used as the macromolecular substance, and the
surfactants were successively: sodium dodecyl sulphate (SDS), Sodium Lauryl Ether Sulfate (SLES), Sodium
Lauroyl Sarcosinate (SLS). The research was carried out for two-component solutions (water, hydrolysate)
and three-component solutions (water, hydrolysate, surfactant).
In order to document this thesis, tribological tests were performed with a constant and increasing load as a
function of time. Stationary tests with loads of 2, 3, and 4 kN confirmed the predictions that active substances
in two- and three-component solutions create a lubricating film that transfers high loads with relatively low
motion and wear resistance. The stability and durability of the lubricating film were confirmed under the
conditions of increasing load at a speed of 409 N/s. An approximately 12-fold increase in the seizing load
for the hydrolysate solutions in relation to water was found, and the maximum load value for the T02 tester
(7200 N) was achieved. The durability of the lubricating film was mainly determined by the adsorption of the
hydrolysate, which was confirmed by physicochemical tests.