Tribiological properties of oil-soluble polyolefins
Polyolefins, in the form of either dispersions or homogeneous solutions, are used extensively as lube oil additives. However, the information available on their tribological properties is fragmentary and often contradictory. In order to select additives of this type and in order to understand the mechanism of their lubricating action, comparative evaluations of their tribological properties are required. We have investigated the tribological properties of high-pressure polyethylene PE (Grade 12003-200), polypropylene PP (Grade 21060-61), and polyisobutene PIB (Grade P-85). In order to determine the properties of the polymers that are pertinent to their use as an active component of a lubricating medium, we investigated two-component systems consisting of a mineral oil and a polymer. The compatibility of the polyolefins with the oil base was determined visually by a polythermal method. Blends were prepared in I-12A mineral oil [industrial oil] by dissolving up to 1% polymer at various temperatures: PE at 125-130{degrees}C for 5 h, PP at 140-150{degrees} for 4 h, and PIB at 110-120{degrees}C for 3 h. The 1% concentration is within the optimal range for lubricating-cooling process fluids used in metalworking processes. The tribological properties of the polyolefins were evaluated in two friction testers: a four-ball friction tester (GOST 9490-75), and a Falex tester. The wear scar diameter D{sub w}, which characterizes the antiwear properties of the medium, was determined as the arithmetical average of the wear scar diameters on the three lower balls in the four-ball tester after a 1-h run with an axial load of 0.15 kN and a sliding speed of 0.54 m/sec. The influence of the oil solutions of polyolefins on the process of metal failure or wear was rated on the basis of the energy criterion A{sub s} - the specific work of surface breakdown or wear of metal, defining the quantity of work of friction consumed in removing unit volume of metal from the contacting surfaces.
- OSTI ID:
- 191803
- Journal Information:
- Chemistry and Technology of Fuels and Oils, Vol. 29, Issue 11-12; Other Information: PBD: Jul 1994; TN: Translated from Khimiya i Tekhnologiya Topliv i Masel; No. 11, 17-18(Nov 1993)
- Country of Publication:
- United States
- Language:
- English
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