Compositions – Magnetic – Flaw detection or magnetic clutch
Patent
1977-01-05
1978-06-13
Edmundson, F.C.
Compositions
Magnetic
Flaw detection or magnetic clutch
252 6251, H01F 125, H01F 100, C10M 300, C09D 1100
Patent
active
040948048
ABSTRACT:
A water base magnetic fluid is provided by adding an unsaturated fatty acid with 18 carbon atoms or a salt thereof into a colloidal solution of a ferromagnetic oxide power in water, subsequently adding an acid solution to the colloidal solution to develop a precipitate by a flocculation, separating the precipitate from the solution, and adding an anionic surfactant with 8 to 30 carbon atoms, or a non-ionic surfactant with 8 to 20 carbon atoms and with H.L.B. of 12 or more, to the separated precipitate in water to peptize the precipitate. The water base magnetic fluid is a stable suspension of the ferromagnetic powder in water. Each particle of the ferromagnetic powder in the fluid is coated with a monomolecular layer of the ionized unsaturated fatty acid and with the non-ionic or anionic surfactant layer being adsorbed on the first monomolecular layer. The average particle size of the ferromagnetic powder may be 150 A or less.
REFERENCES:
patent: 3214278 (1965-10-01), Hanneman
patent: 3531413 (1970-09-01), Rosensweig
patent: 3917538 (1975-11-01), Rosensweig
patent: 3990981 (1976-11-01), Kovac et al.
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