MAGNETIC OIL AND PROCESS FOR PREPARING THEREOF Russian patent published in 1994 - IPC

FIELD: machine building. SUBSTANCE: the oil comprises (wt %): 15-30 magnetite; 10-40 oligoester resulting from 12-hydroxystearic acid or 12-hydroxy-Δ9-octadecenic acid; and carboxylic acid diester, the balance. The oil is prepared by treatment of magnetite in carboxylic acid diester in the presence of an aqueous 12-hydroxystearic acid or 12-hydroxy-Δ9-octadecenic acid on heating to the water evaporation temperature followed by heat treatment of the mixture at a temperature of 110-180 C for 10-40 hr and cooling the resulting oil. EFFECT: improved properties of the magnetic oil. 2 tbl, 1 dwg