Electron ink microcapsule and preparation method thereof
A technology of electronic ink and microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, ink, etc., can solve the problems of increased operation difficulty, capsule scratch resistance, pressure resistance limitation, and failure to meet scratch resistance and pressure resistance Requirements and other issues, to achieve the effect of improving scratch resistance, pressure resistance, and mechanical strength
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[0021] At present, the preparation method of electronic ink microcapsules basically includes process steps such as surface modification treatment of pigment particles, preparation of capsule core solution and preparation of electronic ink microcapsules.
[0022] In the preparation process of electronic ink microcapsules, the pigment particles used can be organic or inorganic pigments, such as titanium dioxide, zinc oxide, and zirconium oxide, and black pigments include carbon black, aniline black, and the like. In actual use, the coloring agent can give the yin and yang particles the target color, and the colored pigments include red, blue, brown, green and so on. White or other colors such as red, yellow, blue, green and other pigments such as titanium dioxide are used in the following specific embodiments.
[0023] In the preparation process of electronic ink microcapsules, the solvent used in the dispersion should have a higher boiling point and a lower melting point, good ...
Embodiment 1
[0031]Mix 0.1M melamine and 0.25M 37% formaldehyde in 100ml distilled water, adjust the pH value to 9 with sodium carbonate aqueous solution, and stir at 60-80°C for 10 minutes to form a transparent and colorless melamine-formaldehyde resin precondensate. Add the above capsule core solution into 100ml of distilled water, stir vigorously to form an oil-water emulsion, add this oil-water emulsion into the melamine formaldehyde prepolymer, adjust the pH value to 5.0 with acetic acid, and add 0.001M PVA aqueous solution 100ml,
[0032] Stir the solution continuously at 70-80°C for 30-60 minutes to produce melamine-formaldehyde prepolymerization reaction. The prepared microcapsule slurry is rinsed with distilled water at 25°C and cooled to solidify the microcapsule wall, and the surface of the microcapsules is washed away with ethanol. The remaining capsule core solution, then filter the microcapsule particles, then pour the above microcapsules into the melamine formaldehyde resin ...
Embodiment 2
[0034] Heat and dissolve 20 grams of melamine and formaldehyde at a molar ratio of 1:6.2 at 50°C, and use the obtained melamine / formaldehyde aqueous prepolymer as liquid A.
[0035] Heat 20-40 grams of isobutylene / styrene / maleic anhydride terpolymer with a molecular weight of about 75,000-90,000, and 500 grams of 2% sodium hydroxide aqueous solution at 80°C for 1.5-3 hours, and the temperature drops after stirring and dissolving. to 60°C and keep warm; pour 80-90 grams of the modified capsule core solution into this solution, stir with a high-speed mixer at a speed of 4000 rpm, emulsify for 5 minutes, and the particle size of the dispersed substance in the emulsion is 2-5 Then use acetic acid to adjust the pH value of the emulsion to 4-5; add liquid A, stir at 60°C for 2 hours, carry out polycondensation reaction, and then cool to room temperature to obtain a microcapsule slurry; filter and wash the microcapsule slurry , sieving, and then use the microcapsule as the capsule co...
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