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Liquid core microcapsule based on hydrogel as well as preparation method and application of liquid core microcapsule

A technology of microcapsules and hydrogels, applied in the directions of microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of material, preparation, and maintenance cost increase, and achieve the effect of expanding the application field.

Active Publication Date: 2022-08-02
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, electroluminescent devices often need to be equipped with sensors in the field of monitoring and display. When the external mechanical interaction triggers the sensor to transmit electrical signals, electroluminescence can be realized, which leads to the increase of materials, preparation and maintenance costs.

Method used

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  • Liquid core microcapsule based on hydrogel as well as preparation method and application of liquid core microcapsule
  • Liquid core microcapsule based on hydrogel as well as preparation method and application of liquid core microcapsule
  • Liquid core microcapsule based on hydrogel as well as preparation method and application of liquid core microcapsule

Examples

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preparation example Construction

[0081] like figure 2 As shown, embodiments of the present invention also provide a method for preparing a hydrogel-based liquid-core microcapsule, comprising the following steps:

[0082] S1 mixes the conductive liquid and sodium alginate in a mass ratio of 100:0.5-1.5 to obtain a core material solution, which is ready for use;

[0083] S2 Mix urea and formaldehyde solution according to the mass ratio of 1:1 to 1:3, add deionized water to dilute, use triethanolamine solution pH=8.5, and then take out and cool to room temperature after magnetic stirring in a water bath for 30 to 60 minutes , to obtain a transparent urea-formaldehyde prepolymer wall material solution, which is ready for use; then, use electrostatic spray to drop the core material solution into a calcium chloride solution with a mass percentage concentration of 3% to 5% (for curing, forming a hydrogel stable system), the hydrogel microspheres are obtained after 20-30 minutes of complete curing, wherein by calcu...

Embodiment 1

[0114] 1. Preparation of liquid-core hydrogel microcapsules

[0115] First, mix 10 g of deionized water with 0.1 g of sodium alginate (concentration of 1.05-1.15 Pa.s) to obtain a core material solution, which is ready for use.

[0116] Then, mix 1 g of urea and 2 g of formaldehyde solution (37% by mass), and add 3 g of deionized water to dilute (adjust pH=8.5 with triethanolamine, then magnetically stir in a water bath (70° C., 300 rpm / min) for 30 After a few minutes, it was taken out and cooled to room temperature to obtain a transparent urea-formaldehyde prepolymer wall material solution, which was ready for use.

[0117] Next, the obtained core material solution was dropped into 60 g of calcium chloride solution (calcium salt solution) with a concentration of 4 wt % using electrostatic spray (10 kV), wherein a syringe pump (drop acceleration rate 50 mm / h) was used to push the syringe (Suzhou Jiaqicheng, 30G, 38mm, 0.16) formed into electrostatic spray droplets, and after ...

Embodiment 2

[0129] The difference between this example and Example 1 is that 10 g of deionized water in step 1 of this example is replaced by 10 g of polyethylene dioxythiophene-polystyrene sulfonate (PEDOT-PSS) dispersion liquid (containing PEDOT-PSS) 40 mg / L), wherein polystyrene sulfonate (PSS) is 1.5% of the mass of PEDOT-PSS. The remaining steps and parameters are the same as in Example 1.

[0130] The deformation rate of the hydrogel microspheres obtained in this example is 10%, and the appearance is mainly spherical, the average particle size is 796 μm, and the polymer dispersion index is 0.81.

[0131] The liquid-core microcapsule obtained in this example includes a polymer wall material and a core material wrapped inside the polymer wall material; the wall material is chitosan-urea-formaldehyde resin (CSUF), and the core material is hydrogel; the liquid core is The average particle size of the microcapsules was 798 μm, and the polymer dispersion index was 0.81. The chitosan-ure...

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Abstract

The invention relates to a liquid core microcapsule based on hydrogel as well as a preparation method and application of the liquid core microcapsule. The liquid core microcapsule comprises a macromolecular wall material and a core material wrapped in the macromolecular wall material, the macromolecular wall material is chitosan-urea formaldehyde resin, and the chitosan-urea formaldehyde resin comprises a urea formaldehyde prepolymer and chitosan; the mass ratio of the urea formaldehyde prepolymer to the chitosan is (0.5-2): 1; the average molecular weight of the urea formaldehyde prepolymer is 825.79, and the polymerization degree of the urea formaldehyde prepolymer is 9-18; the viscosity of the chitosan is 1t; the molecular weight is 100,000 to 300,000, and the N-deacetylation degree is 70 percent; the core material is hydrogel containing aqueous liquid, and the mass of the aqueous liquid accounts for 93.68%-98.5% of the total mass of the liquid core microcapsule. According to the device, a sensor is not needed, light emitting can be directly achieved through stress, the visual monitoring effect is achieved, the preparation and analysis cost can be effectively reduced, and the device has important significance on development of a light-weight and pressure-sensitive monitoring system.

Description

technical field [0001] The invention belongs to the technical field of microcapsules, and in particular relates to a hydrogel-based liquid-core microcapsule and a preparation method and application thereof. Background technique [0002] With the development of my country's economy, the demand for flexible devices based on environmentally friendly materials is increasing, especially the application of lightweight interactive displays in the field of smart displays. At present, as a representative of cold light sources, electroluminescent devices have the advantages of flexibility, low power consumption, long life, stable and adjustable brightness, etc., and are widely used in lighting, interactive display, flexible electronics, intelligent monitoring and other fields, and have attracted domestic and foreign scholars their widespread attention. [0003] However, electroluminescent devices often need to be equipped with sensors in the field of monitoring and display. When the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/04B01J13/02B01J13/00C08G12/12G02F1/155G02F1/153G02F1/1516G02F1/15
CPCB01J13/046B01J13/025B01J13/0065B01J13/0069C08G12/12G02F1/155G02F1/1533G02F1/15165G02F1/15Y02B20/00
Inventor 孙志成刘艺彬刘晨阳陈揭王美琳
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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