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Preparation method of microcapsule for electronic paper display

A display and microcapsule technology, which is applied in nonlinear optics, instruments, optics, etc., can solve problems such as poor pressure performance, poor stability, and high cost, and achieve the effect of reducing costs and uniform particle size distribution

Inactive Publication Date: 2009-04-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has disadvantages: it cannot change images instantly like an electronic display, so it cannot be reused
The urea-formaldehyde resin microcapsule wall material has high mechanical strength, but poor flexibility. Therefore, the flexible electrophoresis made of this material shows poor scratch resistance and pressure resistance.
Nakamura etc. have described the preparation method that the microcapsule of a kind of gelatin-gum arabic system is used for electrophoretic display, and this microcapsule solvent stability is very good, but because gelatin and acacia are all natural products, stability is relatively poor, and Gum Arabic is an imported product for China, and large-scale commercial use will be an expensive raw material; in addition, gum Arabic is easy to degrade, and long-term use will affect the performance of microcapsules

Method used

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  • Preparation method of microcapsule for electronic paper display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Dissolving 10 grams of sodium carboxylignin sulfonate and 0.1 gram of sodium hexadecyl sulfonate in water at 80°C to obtain an aqueous solution;

[0020] 2) Add 5 grams of silica particles and 0.5 grams of oil-soluble blue to 300 grams of tetrachlorethylene, and ultrasonically vibrate at 40°C to make it a uniform electrophoretic suspension. Take 70 grams of the electrophoretic suspension and add it to In the above aqueous solution, stir for 20 minutes to obtain an O / W emulsion;

[0021] 3) Dissolve 200 grams of gelatin in water at 50°C to make a 50% aqueous solution, add 20% acetic acid solution, adjust the pH value to 6.5, and add the prepared gelatin aqueous solution to the above O / W emulsion;

[0022] 4) At 50°C, add 20% acetic acid solution to the product of step 3), and adjust the pH value to 4.5;

[0023] 5) During stirring, the temperature of the reaction product in step 4) was reduced to 10°C, and 2.5 milliliters of 37% formaldehyde aqueous solution was adde...

Embodiment 2

[0026] 1) Dissolving 10 grams of polyacrylamide and 1 gram of sodium hexadecylbenzenesulfonate in water at 40°C to obtain an aqueous solution;

[0027] 2) Add 5 grams of silicon dioxide particles and 0.5 grams of oil-soluble black to 200 grams of tetrachlorethylene, and ultrasonically vibrate at 50 ° C to make it a uniform electrophoretic suspension. Take 10 grams of the electrophoretic suspension and add it to In the above aqueous solution, stir for 5 minutes to obtain an O / W emulsion;

[0028] 3) Dissolve 1 gram of gelatin in water at 40°C to make a 1% aqueous solution, add 5% sulfuric acid solution, adjust the pH to 6.0, and add the prepared gelatin aqueous solution to the above-mentioned O / W emulsion;

[0029] 4) At 40°C, add 5% sulfuric acid solution to the product of step 3) to adjust the pH value to 4.0;

[0030] 5) During stirring, the temperature of the reaction product in step 4) was reduced to 0°C, and 4 ml of 15% formaldehyde solution was added to cross-link the w...

Embodiment 3

[0033] 1) Dissolving 1 gram of sodium alginate and 1 gram of sodium α-alkenyl sulfonate in water at 100°C to obtain an aqueous solution;

[0034] 2) Add 10 grams of titanium dioxide particles and 0.5 grams of oil soluble blue to 300 grams of tetrachlorethylene, and ultrasonically vibrate at 70 ° C to make it a uniform electrophoretic suspension. Take 100 grams of the electrophoretic suspension and add it to the above aqueous solution , stirred for 70 minutes to obtain an O / W emulsion;

[0035] 3) Dissolve 10 grams of gelatin in water at 70°C to make a 2% aqueous solution, add 0.05% hydrochloric acid solution, adjust the pH value to 6.2, and add the prepared gelatin aqueous solution to the above O / W emulsion;

[0036] 4) At 40°C, add 0.05% hydrochloric acid solution to the product of step 3) to adjust the pH value to 4.8;

[0037] 5) During stirring, the temperature of the reaction product in step 4) was lowered to 15° C., and 6 ml of 25% formaldehyde solution was added to cro...

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Abstract

The invention discloses a method for preparing a micro capsule used in electric paper display, which engages polyelectrolyte salt and alkyl electrolyte, to be aggregated with dope to prepare the micro capsule. The method comprises that using right technique, via the surface activator function of the polyelectrolyte salt and alkyl electrolyte, to disperse the electrophoresis suspension in water phase into oil drops with uniform diameter distribution via the share emulsifying function of polyelectrolyte salt and alkyl electrolyte, adding dope, since the polyelectrolyte salt is anionic polymerization electrolyte, under changeable pH value, the polyelectrolyte salt can be engaged with the alkyl electrolyte to be aggregated with the dope, then via right technique, to prepare the round micro capsule with stable, seal property, and uniform diameter distribution. The invention has the advantages that via the engagement between polyelectrolyte salt and alkyl electrolyte, the invention can overcome the defect of arabin natural macromolecule which is degraded easily to affect the property of micro capsule, reduce cost, make diameter distribution uniform, and make property stable.

Description

technical field [0001] The invention relates to a preparation method of microcapsules for electronic paper display. Background technique [0002] The rapid development of information science and technology calls for a new flat-panel electronic display technology that is thin, light, low driving voltage, and low power consumption. Compared with electronic display technology, traditional ordinary paper has superior performance: reflect 80% of the irradiated light; provide satisfactory contrast ratio (about 20:1); disperse reflected light in any direction; cheap, light weight, thin, convenient It is portable, flexible and foldable, and can provide color images; it can save images for a long time without consuming energy, and has long-lasting memory. But it also has disadvantages: it cannot change images instantly like an electronic display, so it cannot be used repeatedly. Therefore, combining the advantages of ordinary paper and electronic displays to research and develop a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/167
Inventor 吴刚李炜罡汪茫陈红征
Owner ZHEJIANG UNIV
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