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Preparation method of stable double-particle system electronic ink display solution

An electronic ink, dual particle technology, applied in the treatment of dyed polymer organic compounds, organic dyes, fibrous fillers, etc., can solve the problems of long particle response time, limited display color, low display contrast, etc., and achieve particle response time. Shorten and extend display life, good color rendering effect

Inactive Publication Date: 2010-10-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the disadvantages of low display contrast and limited display colors.
[0004] To sum up, the current domestic research on electrophoretic display liquid has the following deficiencies: 1. It is basically about the preparation of microcapsule electronic ink, and most of them are single-particle electrophoretic displays, which have complex preparation processes, poor mechanical properties, and particles Shortcomings such as long response time and sensitivity to ambient temperature
2. The research on the preparation of electrophoretic display liquid directly used in electronic ink is all for single particle electrophoretic display, and its electrophoretic display effect is not good and has limitations

Method used

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preparation example Construction

[0023] 2. Preparation of color electrophoretic display solution

[0024] (1) Dissolve the pigment in the solvent to make a solution of 3g / L~15g / L; (2) Measure 50~300mL of anti-solvent and add modifier; (3) Put ( 1) Add the medium solution dropwise to the anti-solvent, and stir for 10-40 minutes; (4) Measure 5-20 mL of dispersion medium and add it to the (3) solution, and stir for 10-30 minutes; (5) Stand to separate layers, and remove the lower layer Solution, add stabilizer or charging agent, use KQ5200DE CNC ultrasonic cleaner to sonicate for 10-30min, the ultrasonic parameters are set as: ultrasonic pulse is 2sec on, 1sec off; ultrasonic amplitude is 100%, and the colored electrophoretic particles can be obtained .

[0025] The pigment described in the above (1) step can be toluidine red, phthalocyanine blue, Yingli blue, benzidine yellow G-R, permanent orange RL, benzidine yellow G, iron oxide red, phthalocyanine green, quinacridone purple 4R, naphthol green B, medium ch...

Embodiment 1

[0035] Preparation of green and white two-particle electrophoresis display solution

[0036] (1) Weigh 0.04g phthalocyanine green and dissolve in 5mL concentrated sulfuric acid (mass concentration: 98%); (2) Weigh 0.16g CTAB and 0.04g PVP and add them to a mixed solution of 50mL water and 50mL isopropanol , stir, and add it into a 250mL three-necked flask after it is completely dissolved, control the temperature of the water bath at 25°C, and the stirring speed at 900rpm; (3) Add the phthalocyanine green-concentrated sulfuric acid solution in (1) dropwise to the three-necked flask in (2) Carry out recrystallization in the bottle and modify the surface of the particles, stir for 30 minutes; (4) Measure 8 mL of tetrachlorethylene and add it to the suspension in (3), stir for 20 minutes; The solution was added with 0.12g Span80, stirred for 60min, and ultrasonically treated with a KQ5200DE digitally controlled ultrasonic cleaner for 10min. The ultrasonic parameters were set as fo...

Embodiment 2

[0040] Preparation of Green-black Double Particle Electrophoresis Display Solution

[0041] (1) Weigh 0.04g phthalocyanine green and dissolve in 5mL concentrated sulfuric acid (mass concentration is 98%); (2) Weigh 0.2g SDS and 0.04g PVP, add to the mixed solution of 50mL water and 50mL isopropanol , stir, and add it into a 250mL three-necked flask after it is completely dissolved, control the temperature of the water bath at 25°C, and the stirring speed at 800rpm; (3) Add the phthalocyanine green-concentrated sulfuric acid solution in (1) dropwise to the three-necked flask in (2) Carry out recrystallization in the bottle and modify the surface of the particles, stir for 30 minutes; (4) Measure 8 mL of tetrachlorethylene and add it to the suspension in (3), stir for 20 minutes; Add 0.1 g of Triton X-100 to the solution, stir for 60 minutes, and use a KQ5200DE digitally controlled ultrasonic cleaner to sonicate for 10 minutes. The ultrasonic parameters are set as follows: ultra...

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Abstract

The invention relates to a preparation method of a stable double-particle system electrophoretic display solution for electronic ink display. Pigment electrophoretic particles which have small particle diameter and good dispersibility can be obtained through recrystallization and surface modification, and the dispersion stability and the surface charge of the particles can be improved by adding charging agents and dispersing agents. The particle diameter of the electrophoretic particles in the invention can reach 30-350nm. Two single-particle electrophoretic display solutions are prepared in proper proportions, and proper stabilizing agents and charging agents are added to obtain the double-particle system electrophoretic display solution, thereby obviously improving the display contrast,shortening the response time (the response time is 0.8-2s), obviously improving the stability of the electrophoretic display solution (the sedimentation rate is 8-14% after standing for 30d), and creating the condition for realizing industrial application.

Description

Technical field: [0001] The invention relates to a preparation method of a stable two-particle system electronic ink display liquid, which belongs to the preparation technology of the electrophoretic display liquid. Background technique: [0002] Electronic ink display technology is a new display technology that integrates the knowledge of chemistry, physics, and electronics. It has the advantages of good display effect, low power consumption, and easy portability. At present, many companies in the world, such as E-Ink, Philips, Sony, Lucent, Amazon, Sipix Imaging, etc., have conducted in-depth research on electronic ink display technology, and many new products have entered the sales market. However, domestic electronic ink research started late, and the realization of display is still in the laboratory stage. There are few types of electrophoretic particles, and the modification effect is not good, which is far behind foreign countries. The principle of electronic ink dis...

Claims

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Application Information

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IPC IPC(8): C09B67/20C09B67/46C09C1/36C09C1/56C09C3/12C09C3/10G02F1/167
Inventor 乐园李达陈抒刘小萌陈建峰
Owner BEIJING UNIV OF CHEM TECH
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