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Electronic ink microcapsule and preparation method thereof

An electronic ink and microcapsule technology, applied in the directions of microcapsule preparation, microsphere preparation, ink, etc., can solve the problem that the barrier property of electrophoresis medium needs to be further improved, so as to meet the mechanical strength and flexibility, save energy, and improve the barrier. sexual effect

Active Publication Date: 2012-08-22
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the barrier property of the capsule to the electrophoretic medium needs to be further improved.

Method used

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  • Electronic ink microcapsule and preparation method thereof
  • Electronic ink microcapsule and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0020] Preparation of electrophoretic suspension

[0021] Mix 20g of titanium dioxide, 20g of azo dyes, 55g of carbon tetrachloride, and 5g of polyisosuccinic anhydride as a charge control agent to prepare 100g of electrophoretic suspension for later use.

Embodiment 1

[0023] Using deionized water to prepare 100 g of silica sol with a silica mass percentage of 7%, which is alkaline. Add 12 g of the electrophoretic suspension to the silica sol under stirring to form a Pickeriing emulsion. Dissolve 3.5 g of gelatin in 31.5 g of deionized water at 60°C to obtain an aqueous gelatin solution. The prepared aqueous gelatin solution was then added to the aforementioned Pickering emulsion. And slowly add acetic acid therein to adjust the pH value to 4.0, and carry out the re-coagulation reaction for 2 hours. The reaction solution was cooled to 5° C., and 3 ml of 37% formaldehyde aqueous solution was added to solidify and crosslink for 5 hours. Slowly add 3% sodium hydroxide solution to the reaction solution to adjust the pH value to 8, then raise the temperature to 55° C., and continue the reaction for 2 hours to obtain electronic ink microcapsules.

Embodiment 2

[0025] Using deionized water to prepare 100 g of silica sol with a silica mass percentage of 16.5%, which is alkaline. Add 23g of the electrophoretic suspension to the silica sol under ultrasonication to form a Pickeriing emulsion. Dissolve 5.5g of gelatin in 49.5g of 60°C deionized water to obtain an aqueous gelatin solution. The prepared aqueous gelatin solution was then added to the aforementioned Pickering emulsion. And slowly add citric acid therein to adjust the pH value to 2.5, and carry out the re-coagulation reaction for 2 hours. The reaction solution was cooled to 5° C., and 3 ml of 37% acetaldehyde aqueous solution was added to solidify and crosslink for 5 hours. Slowly add 3% sodium hydroxide solution to the reaction solution to adjust the pH value to 8, then raise the temperature to 55° C., and continue the reaction for 2 hours to obtain electronic ink microcapsules.

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Abstract

The invention relates to an electronic ink microcapsule and a preparation method thereof. The electronic ink microcapsule comprises a capsule wall and a capsule core (2), wherein the capsule wall comprises a gelatin layer (1) and a silicasol layer (3). The electronic ink microcapsule is prepared from gelatin and silicasol by complex coacervation. In the electronic ink microcapsule provided by the invention, since the alkaline silicasol is used as a solid stabilizer and the capsule wall has a low dielectric constant, the electronic ink microcapsule can be driven by low voltage, thus the energy consumption and cost are reduced. Moreover, since the silicasol has good chemical stability and can generate a condensation reaction with gelatin to form tight combination, the barrier property of the microcapsule wall against the electrophoretic medium is obviously improved, so that the capsule wall meets the requirements for mechanical strength and flexibility simultaneously, and the microcapsule can be applied to flexible display.

Description

technical field [0001] The invention relates to an electronic ink microcapsule for electrophoretic display and a preparation method thereof. Background technique [0002] Electrophoretic display is a display technology based on the electrophoretic phenomenon of charged particles suspended in a dispersion medium. Specifically, it makes the charged substances sandwiched between the electrodes move under the action of an electric field, and changes the direction of the applied electric field to make the movement of the charged substances Causes two or more different colors to be displayed alternately. Compared with existing display technologies, electrophoretic display has the advantages of high brightness, high contrast, stable image, low power consumption, and flexibility. [0003] Electronic ink is a microcapsule liquid material used for electrophoretic display. It encapsulates electrophoretic particles and insulating suspension in microcapsules, which can inhibit the aggre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C09D11/00G02F1/167
Inventor 舒适赵明薛建设赵吉生李琳
Owner BOE TECH GRP CO LTD
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