METHOD OF PRODUCTION OF MAGNETIC FLUID ON POLYETHYLSILOXANE BASIS Russian patent published in 2008 - IPC H01F1/44 

FIELD: technological processes; chemistry.

SUBSTANCE: method includes deposition of magnetite from solution of salts of bivalent and trivalent iron with solution of ammonium hydroxide, which contains 50 vol.% of organic dissolvent - acetone, flushing of prepared deposit with acetone, its stabilisation and resolution of obtained magnetic powder in polyethylsiloxane carrier with addition of alcohol solution of antioxidant additive of n-aminophenol.

EFFECT: higher colloidal and temperature resistance and increase of magneto-liquid seals running time.

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