Disperse dyestuff microcapsule and preparation method thereof
A technology of disperse dyes and microcapsules, which is applied in the direction of organic dyes, etc., can solve the problems of reducing the solvent resistance of dye microcapsules, large voids in melamine resin, and leakage of core materials, so as to avoid dye leakage, low cost, and easy operation Effect
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Embodiment 1
[0042] Preparation of disperse dye microcapsules:
[0043] (1) 12.6g melamine and 20.27g concentration are 37%wt% formaldehyde solution (density 1.09~1.11g / ml, purity is 37 ± 2%) are placed in three-necked flask (the molar ratio of melamine and formaldehyde is 1: 2.5), mix evenly to obtain a mixed solution, heat in a water bath to 70°C, keep warm, add 10% sodium carbonate solution dropwise, so that the mixed solution always maintains a weak alkalinity with a pH value of 8-9, and maintain the reaction for 5 minutes until the melamine is completely dissolved After that, a clear and transparent aqueous solution of melamine resin was obtained.
[0044] (2) Dissolve 2g of Disperse Blue 2BLN in 40g of toluene solvent to obtain a dye toluene solution, and then slowly add the dye toluene solution dropwise into 800ml of distilled water under stirring at a high speed (3000rpm) of an emulsifier to make the fine particles The dye is recrystallized in distilled water, filtered, and the fi...
Embodiment 2
[0048] Preparation of disperse dye microcapsules:
[0049] (1) 12.6g melamine and 24.32g concentration are 37%wt% formaldehyde solution (density 1.09~1.11g / ml, purity is 37 ± 2%) are placed in three-necked flask (the molar ratio of melamine and formaldehyde is 1: 3.0), mix evenly to obtain a mixed solution, heat in a water bath to 70°C, keep warm, add 10% sodium carbonate solution dropwise, so that the mixed solution always maintains a weak alkalinity with a pH value of 8-9, and maintain the reaction for 40 minutes until the melamine is completely dissolved After that, a clear and transparent aqueous solution of melamine resin was obtained.
[0050](2) Dissolve 2 g of Disperse Violet 93 in 300 g of toluene solvent to obtain a dye toluene solution, and then slowly add the dye toluene solution dropwise into 2000 ml of distilled water under stirring at a high speed (10,000 rpm) of an emulsifier to make the fine particles The dye is recrystallized in distilled water, filtered, an...
Embodiment 3
[0054] Preparation of disperse dye microcapsules:
[0055] (1) 12.6g melamine and 28.38g concentration are 37%wt% formaldehyde solution (density 1.09~1.11g / ml, purity is 37 ± 2%) are placed in three-necked flask (the molar ratio of melamine and formaldehyde is 1: 3.5), mix evenly to obtain a mixed solution, heat in a water bath to 70°C, keep warm, add 10% sodium carbonate solution dropwise, so that the mixed solution always maintains a weak alkalinity with a pH value of 8-9, and maintain the reaction for 25 minutes until the melamine is completely dissolved After that, a clear and transparent aqueous solution of melamine resin was obtained.
[0056] (2) Dissolve 2 g of Disperse Yellow 104 in 160 g of toluene solvent to obtain a dye toluene solution, and then slowly add the dye toluene solution dropwise into 1000 ml of distilled water under stirring at a high speed (4000 rpm) of an emulsifier to make the fine particles The dye is recrystallized in distilled water, filtered, an...
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