Bio-based phosphonates as lubricants

Authors: Bantchev, Grigor; Biresaw, Girma; AJAYI, OYELAYO - Argonne National Laboratory; LORENZO-MARTIN, CINTA - Argonne National Laboratory

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/30/2020
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: In the current presentation, we will talk about phosphonates made from biobased unsaturated materials (fatty acid methyl esters or limonene) and H-phosphonates (commonly known as dialkyl phosphates). The H-phosphonate – ene reaction is similar to the thiol-ene reaction. It has some of the characteristics of a “click” chemistry reaction: it is reversible, and is cost effective (theoretically it can be carried out with no by-products). As a solvent, we used an excess H-phosphonate, which was recovered after the reaction by simple distillation. A variety of tests were done to evaluate the suitability of the biobased phosphonates for lubrication applications – antiwear (ASTM D4172), extreme pressure (D2783), viscosity (D445 and D7042), cold flow (D97 and D2500), bulk modulus, mini traction machine, and oxidative stability with pressurized DSC test. The phosphonated products had better oxidative stability than the starting biobased materials. They also had improved cloud point, pour point, and improved extreme pressure weld point. These are important properties for lubrication applications. In a model lubrication test, the biobased phosphonate materials showed lower friction, traction and wear than commercial hydraulic fluids used for comparison. The viscosity index and bulk modulus were higher than those of the commercial hydraulic fluids. All these properties indicate that the biobased phosphonates have the potential to be used in demanding hydraulic fluid applications.