METHOD FOR SYNTHESIZING NEAR-INFRARED ABSORBING DYES, CAPABLE OF IMPROVING THE YIELD OF THE NEAR-INFRARED ABSORBING DYES USING A METHOD OF ADDING REACTANTS IN TWO STEPS

摘要

PURPOSE: A method for synthesizing near-infrared absorbing dyes is provided to improve dispersion property and homogeneity by controlling a particle size of the dyes by irradiating ultrasonic waves and to enhance properties including heat resistance, wet proof property, visible light transmission rate, and stability when the dyes are applied to a near-infrared radiation absorbing film.;CONSTITUTION: A method for synthesizing diimonium-based near-infrared absorbing dyes comprises: a step(S100) of manufacturing a diamine-based oligomer by reacting a dimaine-based compound, a nitro aromatic compound, and an anhydrous potassium carbonate in a formamide-based organic solvent; a step(S200) of manufacturing a first diimonium-based oligomer by adding the manufactured diamine-based oligomer, metal compounds, and hydrazine to the organic solvent; a step(S300) of manufacturing a second diimonium-based oligomer and crystallizing the oligomer by adding chlorides and potassium salts to the first diimonium-based oligomer and irradiating ultrasonic waves; and a step(S400) of oxidizing a mixture and recrystalizing the mixture using distilled water after adding the crystallized second diimonium-based oligomer and an oxidizing agent to a water-soluble solvent.;COPYRIGHT KIPO 2010