PREPARATION METHOD OF COLLOIDAL IRON OXIDE NANOPARTICLES DISPERSED IN OIL WITH HIGH DISPERSITY AND HIGH STABILITY

摘要

A method for preparing colloidal oil-soluble iron oxide nano-particle with high dispersity and stability is provided to improve dispersity of the particle in organic solvent and to employ the particle in magnetic recording medium, printer ink, paint additive, ferrofluild, etc. by preparing iron hydroxide slurry and capping surface of the slurry in fatty acid and petroleum solvent to form the nano-particle. The method includes the steps of: preparing iron hydroxide by reacting iron precursor compound with basic compound containing alkaline metal, alkaline earth metal or ammonium cations to form microfine iron hydroxide, precipitating and washing the product; preparing amorphous colloidal iron hydroxide nano-particles by blending the washed product with C10 to C30 fatty acid and petroleum solvent; and preparing iron oxide nano-particles after separating the colloidal iron hydroxide nano-particles into water phase and organic phase, removing the water phase and water content from the organic phase.