Add time:09/30/2019         Source:infona.pl

Castor oil is an attractive feedstock for the preparation of a variety of industrially important products due to the presence of ricinoleic acid with hydroxyl functionality up to 85–90%. Methyl ricinoleate was esterified with different dicarboxylic acids to prepare a series of a new class of estolides under solvent and catalyst‐free conditions. The products were evaluated for their physico‐chemical and lubricant properties. The estolide esters have a wide viscosity range varying from ISO VG 15 to 46. All the products exhibited excellent pour points (−48 to <−60°C) outperforming the reported estolide products. Among the estolide esters, 2‐ethyl‐1‐hexyl esters of monoacid estolides exhibited higher oxidative onset values (199°C). Dimer estolides and 2‐ethylhexyl esters of monoacid estolides exhibited better thermal stability compared to all other estolide esters. The products having low pour points can be potential base oils for low temperature lubricant applications. Practical applications: Synthesis of potential lubricant basestocks from indigenous non‐edible oil under solvent and catalyst‐free conditions. Prepared biolubricants with very low pour points, which is difficult to achieve with vegetable oil derivatives. The products are potential candidates for low temperature applications.Estolides with low pour points.

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