The present invention relates to a method for preparing a high-molecular weight organic/inorganic hybrid polymer supercritical fluid which has self-assembly/self-organization/self-dispersibility and which is usable as an inkjet ink containing a coloring body, a phosphorescent body, a fluorescent body, an organic matter, an inorganic matter, and an organic/inorganic hybrid material, which are necessary for an aqueous or a vegetable oil-based nonaqueous ink composition for digital printing, and more specifically, to an ink composition and a method for preparing the ink composition, the ink composition not containing or inducing chemical materials harmful to the human body or environment and being usable together with various coating methods. In addition, apart from problems in ink preparation, considering that iron and phosphate, which are magnetic materials that influence the stability of a head, are mainly used for a surfactant, the method described in the present patent application as filed by our company: provides a countermeasure and a solution for the problems; provides a method for preparing an ink vehicle using a supercritical fluid of three-dimensional switching micelle type high-molecular weight organic/inorganic hybrid polymer particles, which is usable as an inkjet ink containing a coloring body, a phosphorescent body, a fluorescent body, an organic matter, an inorganic matter, and an organic/inorganic hybrid material, based on the combination of submicro emulsion and subnano suspension based on aqueous and vegetable oil-based solvents that may be presented through papers or utilized in academia, which has (self-assembly, self-organization, self-dispersibility), and which has a subnano size so as to allow suspension or emulsification; and provides a preparing method using very diverse materials and various coating instruments in a safer and more convenient preparing process.
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