By Sevim Z. Erhan, Joseph M. Perez
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Additional info for Biobased Industrial Fluids and Lubricants
Teeter and coworkers (13) developed synthetic lubricant base oils with low pour points based on the diesters of 9(10)- or 12-hydroxystearic acid. The materials were prepared by esterification of the carboxyl and hydroxy groups of hydroxystearic acid with various aliphatic alcohols and acids, respectively (13). p. of the compounds prepared ranged from –20 to –53°C. 1 shows how oleic acid was converted into the diesters of 9(10)-hydroxystearic acid. Among products with R = methyl, R′ = 2-ethyl-1-hexyl and R = ethyl, R′ = 2-ethyl-1-hexyl gave the lowest pour points of –53 and –52°C, respectively.
2. Oxidative evaporation of products with a linear R′ during the Pennsylvania State micro-oxidation test. PAO, polyalphaoleffin. Copyright © 2002 AOCS Press Fig. 3. Insoluble deposits of products with a linear R′ during the micro-oxidation test. 2 for abbreviation. propanol, 2-ethyl-1-hexanol, and a Guerbet alcohol (Jarcol I-18T) were prepared. Guerbet esters are used as components in various commercial products such as hydraulic oils because of their excellent lubricating properties, low pour points, and low volatility (24).
Structure of ricinoleic acid. Copyright © 2002 AOCS Press Pour point is affected by the structure of the FA present in various vegetable oils. The pour points of unadditized vegetable oils are higher than synthetic diesters, most polyol esters, and PAO. 2, where the lowest pour point for common vegetable oils is only –33°C. Most vegetable oils are solid at temperatures at which Brookfield viscosities (ASTM D2983) are measured (5). High-Oleic Versions of Vegetable Oils Many vegetable oils do an excellent job of lubricating metal surfaces.
Biobased Industrial Fluids and Lubricants by Sevim Z. Erhan, Joseph M. Perez