Magnetic fluid composition

Details Magnetic fluid composition Magnetic fluid composition

1991-02-15

1992-09-01

Willis, Jr., Prince

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6251, 2523152, 427214, 427216, C09K 300, H01F 128

Patent

active

051436370

ABSTRACT:
A heat-resistant, water-resistant, low-viscosity magnetic fluid and a process for producing same has a dispersion medium made of a low-volatile organic solvent, a low molecular weight dispersant having a lipophilic group and a polar group, the lipophilic group having an affinity for the organic solvent, ferromagnetic particles dispersed in the organic solvent, the surface of each of the ferromagnetic particles being covered with the dispersant, and an additive added to the dispersion medium having a lipophilic group and a polar group, the lipophilic group having a macromolecular chain. The process includes a step of adding the additive to the dispersion medium. The lipophilic group includes a macromolecular chain. The magnetic fluid is suitable for service, e.g., in a shaft seal.

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