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Preparation method of microcapsule for electrophoretic display

An electrophoretic display and microcapsule technology, which is applied in the direction of microcapsule preparation, microsphere preparation, optics, etc., can solve the problems of poor pressure performance, poor stability, and high cost, and achieve the effect of uniform particle size distribution and cost reduction

Inactive Publication Date: 2004-11-10
ZHEJIANG UNIV
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  • 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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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Styrene and maleic anhydride mol ratio is 1: 1, and number-average molecular weight is the styrene-maleic anhydride copolymer hydrolyzate of 6000 and gelatin are respectively made into 100 grams of 6% aqueous solution, their pH value is adjusted to 6.5, And keep it warm at 40°C for later use.

[0020] Add electrophoretic particles, dyes, and additives to tetrachlorethylene, ultrasonically vibrate at 40°C to make 70 grams of a uniform dispersion, add to the above-mentioned solution of styrene-maleic anhydride copolymer hydrolyzate, and stir to obtain O / W type emulsion, oil droplets of a certain size are obtained at a certain stirring speed, the prepared gelatin solution is added to the emulsion, and the pH value of the system is reduced to 4.5 with 10% acetic acid solution at 40 ° C, and then 5 Add hot water twice as much as the gelatin aqueous solution into the emulsion, slowly lower the temperature to 10°C while stirring, add 2.5 ml of 37% formaldehyde aqueous solutio...

Embodiment 2

[0022] Styrene and maleic anhydride molar ratio is 1: 2, and number-average molecular weight is the styrene-maleic anhydride copolymer hydrolyzate of 15000 and gelatin are respectively made into 80 grams of 1% aqueous solution, and gelatin is made into 100 grams of 1% aqueous solution. aqueous solution, adjust their pH value to 6.0, and keep warm at 60°C for later use.

[0023] Electrophoretic particles, dyes, and additives were added to tetrachlorethylene, and ultrasonically oscillated at 60° C. to form 30 grams of a uniform dispersion. Add it to the solution of the hydrolyzate of the above-mentioned styrene maleic anhydride copolymer, stir to obtain an O / W type emulsion, and obtain oil droplets of a certain size at a certain stirring speed, and add the prepared gelatin solution to the emulsion, at 60 Use 3% citric acid solution to reduce the pH value of the system to 4.0 at ℃, slowly lower the temperature to 5 ℃ while stirring, add 4 ml of 37% formaldehyde solution to the ab...

Embodiment 3

[0025] Styrene and maleic anhydride mol ratio is 1: 1, and number-average molecular weight is 11000 styrene-maleic anhydride copolymer hydrolyzates and gelatin are made into 100 grams of 4% aqueous solution respectively, their pH value is adjusted to 6.5, And keep it warm at 50°C for later use.

[0026] Add electrophoretic particles, dyes, and additives to tetrachlorethylene, ultrasonically vibrate at 50°C to make 50 grams of a uniform dispersion, add to the above-mentioned solution of styrene-maleic anhydride copolymer hydrolyzate, and stir to obtain O / W type emulsion, oil droplets of a certain size are obtained at a certain stirring speed, the prepared gelatin solution is added to the emulsion, and the pH value of the system is reduced to 4.5 with 10% acetic acid solution at 50 ° C, and then 5 Add hot water twice as much as the gelatin aqueous solution into the emulsion and stir, slowly lower the temperature to 5°C, add 2.5 ml of 25% glutaraldehyde aqueous solution to the a...

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Abstract

The invention discloses an electrophoresis-displaying microcapsule and its preparing method, which recondenses hydrolysate of styrene-maleic anhydride copolymer and glutin to prepare the microcapsule. By the proper technique, it firstly emulsifies the encapsulated matter in the styrene-maleic anhydride copolymer solution, adds in the gultin, and then recondenses them by adding acid and / or water. Its advantages: provision of synthetic high-molecular styrene-maleic anhydride copolymer overcomes the disadvantage that the natural gum Arabic high molecule is easy to degrade so as to affect performance of the microcapsule, and reduces the cost. And by proper technique, it can prepare circular microcapsules which are stable, sealed and have more uniform particle size distribution.

Description

technical field [0001] The invention relates to a preparation method of microcapsules for electrophoretic display. technical background [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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/10G02F1/167
Inventor 汪茫荣宇陈红征
Owner ZHEJIANG UNIV
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