| 摘要 |
The present invention relates to a manufacturing method of a melamine-based microcapsule. The method comprises: (a) adding melamine, 50-300 parts by weight of an aqueous formaldehyde solution based on 100 parts by weight of the melamine, and 0.01-10 parts by weight of alkaline hydroxide based on 100 parts by weight of the melamine, to adjust the pH value to 8-10, and then adding 100-400 parts by weight of polyamine-based compound having at least two amine groups based on 100 parts by weight of the melamine, followed by reaction, thereby forming a melamine-formaldehyde prepolymer; (b) salifying at least one resin selected from ethylene-malenic acid copolymer resin and styrene-malenic copolymer resin with alkaline hydroxide, thereby forming an emulsifier; (c) feeding a core material into the emulsifier, followed by stirring, thereby forming an oil in water type emulsion; (d) mixing the melamine-formaldehyde prepolymer with the oil in water type emulsion, followed by reaction at 40-80°C; (e) feeding a compound reacting with formaldehyde into the reaction product of step (d), followed by reaction at 40-80°C; and (f) feeding a metal or a metal compound reacting with formaldehyde into the reaction product of step (e), followed by reaction at 40-80°C. The present invention can prevent a precipitation phenomenon; minimize the amount of materials added for reducing the residue amount of formaldehyde; maintain the efficacy of the core material in the capsule; and minimize the residue amount of formaldehyde. |
