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Method for preparing electrophoretic particles by using organic pigment

A particle and electrophoretic display technology, which is applied in organic dyes, dyed organic silicon compounds, dyed polymer organic compounds, etc., can solve the problems of uneven particle shape, cumbersome operation, and high quality requirements of organic pigments

Active Publication Date: 2014-01-29
GUANGZHOU OED TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color electrophoretic particles prepared by this method have a wide particle size distribution, irregular shape, complicated processing and cumbersome process, which affects the yield and the display quality of electronic ink.

Method used

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  • Method for preparing electrophoretic particles by using organic pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1: Using organic bispyrrole DPP organic pigments as raw materials to prepare red electrophoretic particles

[0073] (1) Take a 2L clean three-neck flask, add 20g of organic bispyrrole DPP pigment and 550g of ethanol into it, and place it in a water bath, install agitator, condenser, and thermometer, stir and disperse at 900rpm for 1h, Add 46g of ammonia water and 30g of distilled water to the slurry, keep the stirring speed constant, stir for 30min, keep the room temperature and stirring speed constant, add 23g of TEOS (dissolved in 50g of absolute ethanol) with a peristaltic pump, and finish adding at a constant speed within 2h. After the addition, the temperature was raised to 55 degrees, and the stirring speed was kept constant. After 16 hours of reaction, the temperature was naturally lowered without heating, and the reaction was continued for 4 hours.

[0074] After the reaction time of the above step (1) is up, directly add the solution containin...

Embodiment 2

[0077] Example 2: Using β-type copper phthalocyanine blue organic pigment as raw material to prepare blue electrophoretic particles

[0078] (1) Put 10g of β-type copper phthalocyanine blue into a 1L clean three-neck bottle, add 30g of water, put it on and stir, stir and disperse at 350rpm for 10min, then add 23g of ammonia water, and stir again for 10min; then add 250g of absolute ethanol , uniformly disperse under stirring, stir for 30min; measure 23g of TEOS and 50g of ethanol, use a peristaltic pump to add dropwise, and add them to the there-necked flask within 2h. When adding, keep the temperature at room temperature. After the addition, raise the temperature to 55°C for 48h , after the reaction time is up, carry out natural cooling;

[0079] (2) After the reaction time of the above step (1) is up, directly add 30 g of diethylenetriaminopropyltrimethoxysilane, stir at 35° C. for 8 h, and centrifuge after the stirring time is up. Then wash twice with absolute et...

Embodiment 3

[0082] Example 3: Using organic quinophthalone pigments as raw materials to prepare yellow electrophoretic particles

[0083] (1) Take 20g of organic quinophthalone pigment and place it in a 1L clean three-necked bottle, add 450g of absolute ethanol, disperse evenly at 350rpm, and stir for 30min; then add 30g of water, stir and disperse for 10min, add 25.3g of ammonia water, and stir for 10min again After getting 69.3g of TEOS mixed with 46.5ml ethanol, use a peristaltic pump to add it dropwise, and add it into the there-necked flask at a constant speed within 2 hours. After that, carry out natural cooling;

[0084] (2) After the reaction time of the above step (1) is up, directly add N-[3-(trimethoxysilyl)propyl]-N'-(4-vinylbenzyl)ethylenediamine hydrochloride solution (containing solute 54g), at 35 DEG C, stir 8h, after stirring time is up, carry out centrifugation. Then wash twice with absolute ethanol, centrifuge to remove the upper layer solution, then wash tw...

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Abstract

The invention relates to a method for preparing electrophoretic particles by using an organic pigment. Specifically, the invention discloses the method for preparing electrophoretic display particles. The electrophoretic display particles comprise core particles and modifying layers covering on the surfaces of the core particles. The method comprises the following steps: suspending the core particles in a first solvent and adding an alkali into the first solvent to perform alkalization so as to form a first suspension; suspending tetraethyl orthosilicate in a second solvent to form a second suspension; adding the second suspension into the first suspension, and further stirring at the increased temperature to perform the reaction; adding a silane coupling agent containing an amino group into a mixture in the step (3), stirring to perform the reaction and further obtaining pre-modified particles connected with the silane coupling agent; dispersing the obtained pre-modified particles in a third solvent, adding polymer monomers, and uniformly mixing; and adding an initiator to perform polymerization reaction to enable the polymer monomers to be polymerized on the surfaces of the pre-modified particles to form the surface modifying layers, and further obtaining the electrophoretic display particles. The electrophoretic particles obtained by the method disclosed by the invention have the significant improved apparent performance.

Description

technical field [0001] The invention belongs to the technical field of electrophoretic display devices, and specifically relates to a preparation technology of electrophoretic particles, in particular to a method for preparing organic pigment electrophoretic particles by combining sol and inert organic pigments for surface modification treatment. The electrophoretic particle prepared by using the organic pigment in the present invention can be applied to the colored electrophoretic particle in electronic ink. Background technique [0002] In the field of research and development of display screens, the current development trend is towards ultra-large and ultra-thin. Plastic-based flexible displays have always been a hotspot for development because of their light weight, bendability and mass production in rolls. Among them, plastic-based electrophoretic display is one of the most mature flexible display technologies so far. [0003] Compared with plastic-based liquid crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/20C09C3/10C09C3/12G02F1/167
Inventor 熊开斌白世龙朱瑞霆
Owner GUANGZHOU OED TECH INC
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