Lube-Tech Table 2: Lexolube CG-3000: an example of a biobased complex ester
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.118 page 4
Figure 4: Schematic illustration of a Wayside Lubricator
Figure 3: Vegetable oil exposed to heat and air forming a layer of polymer Source: Environmental Lubricants Manufacturing, Inc.
Vegetable oils that are not oxidatively stable such as linseed oil or even used frying oils that are partially oxidised could be used as base oils for water emulsifiable dust control, concrete form and asphalt release agents (figure 3). In those applications the oil when exposed to air and light polymerise and form a protective coating and contain dust. More stable oils could be used for wire rope grease, drill rod grease and rail curve greases. Oils with highest levels of oxidation stability such as genetically enhanced high oleic varieties can be used along with potent anti-oxidants for formulating gear oils and chassis and bearing greases.
As an example, none of the vegetable oils in their natural state could be recommended for formulating aviation hydraulic fluids where they are exposed to extreme cold temperatures. Similarly, for northern cold climates hydraulic oils made from biobased derived
synthetic esters would be preferred over vegetable oils in their natural form. But, vegetable oils could offer high performance and economical alternatives in many applications when selected carefully.
Grease made with vegetable oils offer economy and environmental friendliness if prepared properly. Especially in applications where the product is in direct contact with the environment as in railroad curve grease. Figure 4 shows a schematic illustration of a wayside rail lubricator. A battery-operated pump delivers the grease through hoses to the grease delivery bars attached to the insides of the tracks. As the flanges of the wheels come in touch with the grease, they carry and rub the grease to the inside of the tracks as they roll through the curves (Figures 5). Continuous lubrication over time results in large quantities of grease come in direct contact with the environment.
Other examples include, drill rod grease, truck and chassis greases, and food processing greases.
LUBE MAGAZINE NO.147 OCTOBER 2018 37
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