Abstract
Presently strickt World and European environ mental requirements made force on research, manufacture and use of environmentally friendly lubricants. Scientists lucking for the ways to reduce harm of lubricants to envi ronment and the cost of lubricants too. Both these prob lems can be solved using efficient natural lubricating materials. In current study the natural free fatty acid additive ADX 18 was used to reduce friction and wear lubricating with rapeseed oil. Tests were performed with standard four ball tribometer. The load was 150 N and 300 N. The results show positive influence of free fatty acid additive. How ever the effect in different loads is not equal. In the low loads (150 N) the wear reduction effect of additive is supe rior in comparison with reference oil. In the high loads (300 N) the wear reduction ability is not sufficient. Never theless the friction in both loads is less in comparison with the reference. The use of free fatty acid loaded rapeseed oil can reduce friction and wear in mechanisms with low load condition. http://dx.doi.org/10.5755/j01.mech.17.2.341
Highlights
At present ecological requirements are in the great importance
Pure rapeseed oil and rapeseed oil modified with free fatty acids (FA) were investigated
Free fatty acid concentrations of 0.5; 1 and 2% were used for the modification of rapeseed oil
Summary
At present ecological requirements are in the great importance. A lot of studies had been made in the field of bio fuels, trying to reduce pollution by exhausted gases and use renewable resources [1, 2]. There are opinions that, at higher temperatures, the unsaturated fatty acids can come between lubricated surfaces forming the tribo-polymeric layer which reduces the friction and wear [9]. This investigation shows that free fatty acids ensure good lubrication at boundary lubrication conditions. The combination of sulphur atoms with fatty acids increases the synergetic effect – fatty acids reduce the friction and sulphur ensures the EP properties and reliable wear protection Those elements have a low toxicity which is very important for environmentally friendly lubricants [6]. The results should be compared to commercial environmentally friendly lubricants
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