PRODUCTION OF MAGNETIC FLUID

PURPOSE:To produce a magnetic fluid of improved saturation magnetization by dispersing fine ferrite particles stably in a high concentration in a low-vapor- pressure base oil. CONSTITUTION:This production process comprises adding ions of the metal constituting the ferrite to an aqueous suspension of...

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Bibliographische Detailangaben
1. Verfasser:	KODA MINORU
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY ELECTRICITY FUELS INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS INDUCTANCES LUBRICANTS LUBRICATING COMPOSITIONS MAGNETS METALLURGY PEAT PETROLEUM, GAS OR COKE INDUSTRIES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TECHNICAL GASES CONTAINING CARBON MONOXIDE TRANSFORMERS USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Beschreibung
Zusammenfassung:	PURPOSE:To produce a magnetic fluid of improved saturation magnetization by dispersing fine ferrite particles stably in a high concentration in a low-vapor- pressure base oil. CONSTITUTION:This production process comprises adding ions of the metal constituting the ferrite to an aqueous suspension of fine ferrite particles to effect the adsorption of the ions by the particles, adding a water-miscible organic solvent solution of N-polyalkylenepolyamine-substituted alkenylsuccinimide in such an amount that the imide does not separate from the solution and that the liquid phase can continue to be homogeneous to the resulting mixture to effect the adsorption of the imide by the particles, distilling off the water and the water-miscible organic solvent from the mixture, and dispersing the particles containing the adsorbed imide as a distillation residue in a low-vapor-pressure base oil.