Patent ID: 8951449
Filing Date: 2015-02-10
Classification: C08F,G02B

Abstract:
1. A method for preparing an aqueous nano-pigment dispersion comprising: mixing 2.5 wt %-40 wt % styrene with polymerization inhibitors removed by evaporation, 2.5 wt %-20 wt % acrylate monomer, 0.25 wt %-5 wt % crosslinking monomer, 0.05 wt %-0.5 wt % emulsification adjuvant, selected from the group consisting of cetyl alcohol and cetane, and 0.05 wt %-0.5 wt % oil soluble initiator to form a mixture, and adding 0.25 wt %-2.5 wt % organic pigments to be dispersed to the mixture to form an oil phase solution after dissolution; dissolving 0.05 wt %-2 wt % emulsifier and 0.05 wt %-2 wt % buffer in 40 wt %-90 wt % deionized water to form an aqueous solution; mixing the oil phase solution and the aqueous phase solution and then homogenizing them into fine emulsion; and transferring the fine emulsion into a reactor; heating to increase the temperature to initiate the polymerization; after reacting, adding an alkaline soluble monomer; after continuing the reaction, cooling the temperature to the room temperature; adjusting pH to weak alkaline; and filtering to obtain the aqueous nano-pigment dispersion.