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Electrophoresis display particles as well as preparation method and application thereof

An electrophoretic display and particle technology, which is applied in chemical instruments and methods, optics, instruments, etc., can solve the problems of low content of charged functional groups on the surface, insufficient chargeability, and inconvenient operation, so as to improve dispersion and response time The effect of shortening and enhancing the charge

Active Publication Date: 2015-07-22
GUANGZHOU OED TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anthony used the co-precipitation method to coat silicon dioxide on the surface of copper chromite, and then grafted silane coupling agent and polymer to prepare black electrophoretic particles (US20050000813). This method of coating silicon is at high temperature (100°C) It is inconvenient to operate and the process is more complicated
Zeng Xi et al. synthesized electrophoretic particles in a non-polar / low-polar solvent in a one-step method. This method is simple and efficient and greatly improves the yield (CN101082752A). However, the electrophoretic particles prepared by this method have charged functional groups on their surface. (such as silane coupling agent) content is low, and the chargeability is not strong enough (ζ-potential is ±40~50mv)

Method used

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  • Electrophoresis display particles as well as preparation method and application thereof
  • Electrophoresis display particles as well as preparation method and application thereof
  • Electrophoresis display particles as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An electrophoretic display particle, and an electrophoretic display liquid containing the electrophoretic display particle, the preparation steps are as follows:

[0037] (1) Preparation of color paste: Weigh an appropriate amount of iron black, add it to 1000ml of water, stir and disperse at 400 rpm for 20 minutes, and make a color paste with a pigment particle content of 7.1wt%;

[0038] (2) Coated aluminum oxide film: keep the temperature of the reaction system at 30°C, and add 0.1mol / L Al dropwise to the color paste in step 1) at the same time 2 (SO 4 ) 3 solution and 0.5mol / L NaOH solution; adjust Al 2 (SO 4 ) 3 solution and NaOH solution to keep the pH value of the reaction system at 4.5~5.0; after continuous dropping for 30 minutes, age for 120 minutes, cool to room temperature, centrifuge and wash to obtain Al-coated 2 o 3 Composite pigment particles A.

[0039] (3) Coupling: Take an appropriate amount of the composite pigment particle A prepared in step ...

Embodiment 2

[0043] An electrophoretic display particle, and an electrophoretic display liquid containing the electrophoretic display particle, the preparation steps are as follows:

[0044] (1) Preparation of color paste: Weigh an appropriate amount of titanium dioxide, add it to 1000ml of water, stir and disperse at 400 rpm for 20 minutes, and make a color paste with a pigment particle content of 23.1wt%;

[0045] (2) Coated aluminum oxide film: keep the temperature of the reaction system at 70°C, and add 0.5mol / L Al dropwise to the color paste in step 1) at the same time 2 (SO 4 ) 3 solution and 2mol / L NaOH solution; adjust Al 2 (SO 4 ) 3 solution and NaOH solution to keep the pH value of the reaction system at 5~7.5; after continuous dropping for 180 minutes, age for 240 minutes, cool to room temperature, centrifuge and wash to obtain coated Al 2 o 3 Composite pigment particles A.

[0046] (3) Coupling: Take an appropriate amount of the composite pigment particle A prepared in s...

Embodiment 3

[0050] An electrophoretic display particle, and an electrophoretic display liquid containing the electrophoretic display particle, the preparation steps are as follows:

[0051] (1) Preparation of color paste: Weigh an appropriate amount of copper chrome black, add it to 1000ml of water, stir and disperse at 400 rpm for 20 minutes, and make a color paste with a pigment particle content of 15wt%;

[0052] (2) Coated aluminum oxide film: keep the temperature of the reaction system at 60°C, and add 0.2mol / L Al(NO) dropwise to the color paste in step 1) at the same time 3 solution and 0.8mol / L NaOH solution; adjust Al(NO) 3 solution and NaOH solution to keep the pH value of the reaction system at 5.0~5.5; after continuous dropping for 120 minutes, aging for 200 minutes, cooling to room temperature, centrifuging and washing, the coated Al 2 o 3 Composite pigment particles A.

[0053] (3) Coupling: Mix the composite pigment particle A prepared in step (2) with 800ml ethanol and 2...

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Abstract

The invention provides electrophoresis display particles as well as a preparation method thereof. The electrophoresis display particles sequentially comprise cores, middle layers and shells from inside to outside, wherein the cores are pigment particles, the middle layers are Al2O3 thin films which are coated on the surfaces of the pigment particles, and the shell layers comprise high-molecular polymers and coupling agents coupled with the high-molecular polymers and the Al2O3 thin films. The electrophoresis display particles provided by the invention can be applied to an electrophoresis display liquid, an electrophoresis display coating liquid and an electrophoresis display device. The electrophoresis display particles provided by the invention have high Zeta-electric potential, are applied to the electrophoresis display liquid and have fast electrophoretic mobility and response time.

Description

technical field [0001] The invention relates to the technical field of electrophoretic display, in particular to an electrophoretic display particle and a preparation method thereof. Background technique [0002] Electrophoretic display is a new type of display technology, which has the characteristics of wide viewing angle, low energy consumption, bistable state, and flexible display. The principle of electrophoretic display is: an external electric field drives the colored electrophoretic display particles to swim to a designated position, thereby displaying images, text, video, etc. Electrophoretic display particles are an important part of electronic paper, and their particle size distribution, surface morphology, ζ-potential, optical properties, and chemical properties all play a key role in the contrast, response time, clarity, and service life of electronic paper. Among them, ζ-potential is an important parameter affecting particle performance, which determines the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/24C09C1/36C09C1/34C09C1/56C09C3/12C09C3/10C09C3/06G02F1/167
Inventor 周建林白世龙
Owner GUANGZHOU OED TECH INC
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