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    Synthetic Lubricants from Diesters

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    Synthetic lubricants are finding increased use in specialized applications where they show specific advantages over lubricants obtained by refining natural products. Esters, for a number of reasons, offer considerable promise in this new and expanding field. Among the most promising synthetics are the diesters made from branched chain alcohols and straight chain aliphatic dibasic acids. These materials, exemplified by di-2-ethyl hexyl sebacate, combine a number of the properties desirable in an improved lubricating composition. Comparative data are given on a number of esters of various types, showing diesters of the type described to be at least as desirable as any of the other types of esters. Data are given, likewise, comparing di-2-ethyl hexyl sebacate with petroleum oils of the same and higher viscosity levels. Properties considered include lubricating value, viscosity-temperature characteristics, low-temperature properties, volatility, resistance to oxidation, and protection against rust. A few of the applications to which diester lubricants have been put are mentioned. The preparation of higher viscosity synthetics from the diesters can be accomplished in three ways, an illustration being given using each technique.

    Author Information:

    Glavis, F. J.
    Chemist, Rohm and Haas Co., Philadelphia, Pa.

    Stringer, H. R.
    Chemist, Rohm and Haas Co., Philadelphia, Pa.

    Committee/Subcommittee: D02.B0

    DOI: 10.1520/STP47894S