| abstract |
The present invention comprises the steps of preparing a prepolymer by mixing a polyol, dimethylol propionic acid (DMPA) and isocyanate; Neutralizing the prepolymer with a neutralizer diluted in N-methylpinolidon (NMP) solution; Preparing a water-dispersed polyurethane by adding distilled water to the neutralized prepolymer to disperse the water and adding a chain extender; Nano acrylic comprising a step of adding an acrylic monomer, a biodegradation catalyst and an initiator to the water-dispersed polyurethane and then stirring to prepare a water-soluble acrylic polyurethane; and dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane; The present invention relates to a method for preparing a clay-dispersed water-soluble acrylic polyurethane coating liquid, wherein the coating liquid prepared by the above method has excellent oil resistance, water resistance, oxygen barrier property, moisture resistance, printability, heat sealability, and alkali dissociation property for easy regeneration (recycling). It can be usefully used for coating environmentally friendly food packaging materials. |