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Electrophoretic microcapsules formed by complex coacervation of carboxyl butyronitrile/gelatin and Arabic gum and preparation method thereof

A carboxylated nitrile and gum arabic technology, applied in microcapsule preparation, microsphere preparation, optics, etc., can solve the problems of low strength of microcapsule wall materials, rough surface of microcapsules, poor transparency, etc., and achieve obvious electrophoretic display Responsive, smooth surface, good flexibility effect

Active Publication Date: 2012-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the current method of preparing electrophoretic microcapsules, the microcapsule wall material obtained by gelatin arabic gum complex coacervation method has low strength and is easy to break during the microcapsule grading and coating process; while the surface of microcapsules obtained by urea-formaldehyde in-situ polymerization method is relatively rough , poor transparency

Method used

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  • Electrophoretic microcapsules formed by complex coacervation of carboxyl butyronitrile/gelatin and Arabic gum and preparation method thereof
  • Electrophoretic microcapsules formed by complex coacervation of carboxyl butyronitrile/gelatin and Arabic gum and preparation method thereof
  • Electrophoretic microcapsules formed by complex coacervation of carboxyl butyronitrile/gelatin and Arabic gum and preparation method thereof

Examples

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Effect test

example 1

[0045] 1. Preparation of carboxylated nitrile / gelatin blend material

[0046] The gelatin was formulated into an aqueous solution with a concentration of 2.5%. At 60°C, it was blended with carboxylated nitrile latex:gelatin at a ratio of 100:80, and 1% sodium tetraborate was added as an accelerator for 30 minutes of reaction. After the reaction, the blended solution was kept warm at 40°C for later use.

[0047] 2. Preparation of electrophoretic suspension

[0048] Carbon black electrophoretic particles are added to tetrachlorethylene to form a dispersion with a mass fraction of 1%, and a surfactant with a solution mass fraction of 1% is added to the dispersion, and the surfactant is sorbitan tris Oleate, add 1% charge control agent polyisobutylene monosuccinimide series to the dispersion, then add zirconium beads, grind at 300rpm for 12h, then remove the zirconium beads to obtain a stable white electrophoretic suspension Or black electrophoretic suspension, sealed for future...

example 2

[0056] 1. Preparation of carboxylated nitrile / gelatin blend material

[0057] The gelatin was formulated into an aqueous solution with a concentration of 10%. At 70°C, it was blended with carboxylated nitrile latex: gelatin at a ratio of 100:100, and 2% sodium tetraborate or citric acid was added as an accelerator, and the reaction was carried out for 20 minutes. After the reaction, the blended solution was kept warm at 30°C for later use.

[0058] 2. Preparation of electrophoretic suspension

[0059] TiO 2 The electrophoretic particles are added to tetrachlorethylene to form a dispersion with a mass fraction of 10%, and a surfactant with a solution mass fraction of 2% is added to the dispersion, and the surfactant is polyoxyethylene sorbitan mono-oil Acid, add a charge control agent polyisobutylene monosuccinimide with a solution mass fraction of 2% to the dispersion, then add zirconium beads, grind at 300rpm for 18h, and then remove the zirconium beads to obtain a stable w...

example 3

[0067] 1. Preparation of carboxylated nitrile / gelatin blend material

[0068] The gelatin was formulated into an aqueous solution with a concentration of 10%. At 80°C, it was blended with carboxylated nitrile latex:gelatin at a ratio of 100:120, and 1% sodium tetraborate was added to react for 30 minutes. After the reaction, the blended solution was kept warm at 45°C for later use.

[0069] 2. Preparation of electrophoretic suspension

[0070] Add TiO electrophoretic particles to tetrachlorethylene to prepare a dispersion with a mass fraction of 20%, and add a surfactant with a solution mass fraction of 2% to the dispersion, and the surfactant is polyoxyethylene sorbitan Monooleic acid, add polyisobutylene monosuccinimide, a charge control agent with a solution mass fraction of 2% to the dispersion, then add zirconium beads, grind at 300 rpm for 24 hours, then remove the zirconium beads to obtain a stable white electrophoretic suspension or Black electrophoretic suspension, ...

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Abstract

The invention relates to electrophoretic particle microcapsules formed by complex coacervation of carboxyl butyronitrile / gelatin and Arabic gum and a preparation method thereof. The preparation method comprises the following steps: enabling carboxyl butyronitrile latex and gelatin to carry out blending reaction, and respectively dissolving the carboxyl butyronitrile / gelatin blending material and the Arabic gum and then preparing into a water solution; adding an electrophoretic suspension into the carboxyl butyronitrile / gelatin solution and the Arabic gum solution under the condition of stirring; continuously stirring to enable the carboxyl butyronitrile / gelatin solution and the Arabic gum solution to be fully mixed uniformly; meantime, forming stable oil-in-water emulsion which is condensated into capsules in the system to be separated out; and simultaneously, embedding dispersive capsule cores in the solution to form electrophoretic display microcapsules. In the capsules, the carboxyl butyronitrile / gelatin and the Arabic gum are used as wall materials, and the electrophoretic suspension is a black-and-white bicolor electrophoretic suspension. By improving processes and conditions, microcapsules which have regular geometrical appearance, uniform particle size distribution, smooth and regular surfaces and good transparency and flexibility and can not break easily are prepared.

Description

technical field [0001] The invention relates to electrophoretic particle microcapsules coagulated with carboxybutyronitrile / gelatin and gum arabic and a preparation method thereof, belonging to the technical field of microcapsule preparation. Background technique [0002] Electrophoretic display technology is to disperse charged particles in a suspension liquid to form a colloid. When an electric field is applied to the dispersion system, the charged particles will undergo electrophoresis under the action of Coulomb force. By changing the voltage, the particles of different colors will swim in a direction. The display is formed by transparent electrodes. Electrophoretic display uses electronic ink as the display element, and realizes reversible, bistable, and flexible display under the drive of an external electric field. Microcapsule electrophoretic display technology was first proposed by the Massachusetts Institute of Technology (MIT) Media Laboratory, and then developed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/10G02F1/167
Inventor 李祥高谈廷风王世荣刘昭君赵谦
Owner TIANJIN UNIV
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