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Study of composition and technology of complex lithium grease. L. Ruibin, W. Ping and L. Flusheng. NLGI Spokesm, August 1998, 62(5), 20--26.

A pressure sapronification process is used in a systematic study of the composition and technology of two-component complex lithium greases. A complex of aliphatic acid lithium soap and the lithium salts of low molecular weight acids give high dropping points, good mechanical colloid and oxidation stability, and water resistance. Chemical reactions occurring in the sapronification process are illustrated. Results show that dicarboxylic fatty acids with more than six carbon atoms produce greases with dropping points exceeding 300 C. Promising results are reported using 12-hydroxystearic acid and sebacic acid components. Effects of shearing time are illustrated using transmission electron microscopy. Base oil effects are described and the complexing mechanism is discussed. 6 refs.
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