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Electronic ink microcapsule, and its preparing method

An electronic ink and microcapsule technology, applied in microcapsule preparation, microsphere preparation, ink and other directions, can solve the problems affecting the molecular weight, time, temperature, pH value control of low molecular weight urea formaldehyde prepolymer, and the price of system regulators. Expensive and other problems, to achieve the effect of low price, tight capsule wall, and reduced control difficulty

Inactive Publication Date: 2007-06-13
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The two-step in-situ polymerization process is relatively complicated, and the first step requires high control of time, temperature, and pH value, which affects the molecular weight of the low-molecular-weight urea-formaldehyde prepolymer, which in turn affects the integrity of the microcapsules in the second step of the preparation process.
One-step in-situ polymerization is used to simplify the process. The entire polymerization process of urea and formaldehyde (polyaddition reaction and polycondensation reaction) is continuously completed in the water phase. The process is simple and there is no need to control the molecular weight of the low molecular weight urea-formaldehyde prepolymer. System regulators are expensive and highly toxic to the environment

Method used

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  • Electronic ink microcapsule, and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Carbon black with a particle size of 10-100nm is mixed with organically modified titanium dioxide whose surface has been modified by SDBS. The mass ratio of titanium dioxide is 1: 10), then add 25mg CH-6 hyperdispersant (produced by Shanghai Sanzheng Polymer Material Co., Ltd.), and disperse in 30mL tetrachlorethylene with the help of an ultrasonic breaker to obtain an electrophoretic display liquid. The mass content of the electrophoretic particles is 0.5%. Under stirring, control the temperature to 90°C, dissolve 0.3g of gelatin into 100mL of deionized water, cool to room temperature, obtain a gelatin solution with a mass concentration of 0.3% as the water phase, and dissolve 1.67g of urea (0.1 g / ml capsule core) and 0.167g resorcinol, after being dissolved, adjust the pH value to 1.5 with hydrochloric acid. Adjust the stirring speed to 1000 rpm, add 16.7mL of electrophoretic display solution, after the temperature rises to 60°C, add 3.8mL of 37% formaldehyde, the mo...

Embodiment 2

[0025] The difference between preparing the electrophoretic display solution and Example 1 is that the mass ratio of carbon black and modified titanium dioxide is 1:30, and the other conditions are the same as Example 1.

[0026] Adopt the same steps of Example 1 to prepare microcapsules, and the difference with the conditions of Example 1: the gelatin mass concentration is 0.1%, the urea consumption is 0.27 g / ml capsule core, the pH value is adjusted to 2.0, and the stirring speed is adjusted to 700 rpm. points; obtain electronic ink microcapsules containing two kinds of black and white inorganic particles, the scanning electron microscope (SEM) photo of the electronic ink microcapsules is shown in Figure 3, as can be seen from the SEM photo of Figure 3, the particle size of the microcapsules is 30 to 70 microns , The scanning electron microscope (SEM) photo of a single damaged electronic ink microcapsule is shown in Figure 4. From Figure 4, it can be seen that the thickness o...

Embodiment 3

[0028] The difference between preparing the electrophoretic display solution and Example 1 is that the mass ratio of carbon black and modified titanium dioxide is 1:20, and the other conditions are the same as Example 1.

[0029] The same steps as in Example 1 are used to prepare microcapsules, and the conditions are different from Example 1: the gelatin mass concentration is 1%, the urea consumption is 0.27 g / ml capsule core, the pH value is adjusted to 3.0, and the stirring speed is adjusted to 500 rpm. The electronic ink microcapsules containing black and white inorganic particles were obtained. The scanning electron microscope (SEM) photo of the electronic ink microcapsules is shown in Figure 5. It can be seen from Figure 5 that the particle size of the microcapsules is 40-110 microns. The SEM photos of the damaged microcapsules show that the thickness of the microcapsule wall is 2-5 microns.

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Abstract

This invention is related to a kind of electronic ink micro-capsule, the electrophoretic particles of which are bi-component inorganic grains made of white modified titanium dioxide and black pigment with the grain size of 100~200nm and 10~100nm respectively and the weight ratio from 1:10 to 1:30.The content of the electrophoretic particles in the indicating electrophoretic liquids is 0.5% by weight. The use method to prepare for the electronic ink micro-capsule is one-step in situ polymerization and the used conditioner of the system is gelatine. The mass concentration of the conditioner in the water phase system is 0.1%~1% and the pH value is controlled between 1.5 and 3.0. The volume ratio of the bursa core to the water phase is 1 to 6.

Description

technical field [0001] The invention relates to an electronic ink microcapsule and a preparation method thereof, in particular to a black and white electronic ink microcapsule which uses titanium dioxide and carbon black as electrophoretic particles, tetrachlorethylene as an electrophoretic dispersion medium, and urea-formaldehyde resin as a microcapsule wall material and its preparation method. Background technique [0002] The electronic ink microcapsule is to wrap the electrophoretic display liquid containing the electrophoretic particles and the dispersion medium in the microcapsule, and under the action of the electric field, the electrophoretic particles can realize the electrophoretic display in the microcapsule. The microcapsules inhibit the agglomeration and deposition of the electrophoretic particles in a scale larger than the capsule, improve the stability of the electrophoretic display liquid, and prolong the service life. Compared with the current popular catho...

Claims

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Application Information

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IPC IPC(8): C09D11/02B01J13/14G02F1/167
Inventor 陈建峰李沃源毋伟乐园彭旭慧
Owner BEIJING UNIV OF CHEM TECH
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