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CN-121975347-A - Yellow electrophoresis particle with high electronegativity core-shell structure, and preparation method and application thereof

CN121975347ACN 121975347 ACN121975347 ACN 121975347ACN-121975347-A

Abstract

The invention relates to a high electronegativity core-shell structure yellow electrophoretic particle, and a preparation method and application thereof, and belongs to the technical field of electronic paper display. Aims at solving the problems of low charge density, poor dispersion stability and slow electric field response of the existing color electrophoretic particles. The invention adopts a silane coupling agent containing carbon-carbon double bond to carry out surface chemical modification on the organic yellow pigment, introduces polymerizable sites, and then carries out in-situ polymerization on styrene and polymerizable charge control agent monomer on the surface of the modified pigment to form core-shell structure particles taking the organic pigment as an inner core and the copolymer rich in polar groups as an outer shell. The yellow electrophoretic particles prepared by the invention have the advantages of high electronegativity (high absolute value of Zeta potential), good dispersion stability, bright color, quick electric field response and the like, can effectively improve the color saturation, response speed and reliability of the full-color electrophoretic display, and are simple in process and suitable for large-scale production.

Inventors

  • CUI YUEHUA
  • WU JIAWEN
  • YUAN JIAHU

Assignees

  • 中国科学院重庆绿色智能技术研究院

Dates

Publication Date
20260505
Application Date
20260128

Claims (8)

  1. 1. The high electronegativity core-shell structure yellow electrophoretic particle is characterized in that a silane coupling agent containing carbon-carbon double bonds carries out surface chemical modification on an organic yellow pigment, and carries out in-situ polymerization reaction with styrene and polymerizable charge control agent monomers to form the high electronegativity core-shell structure yellow electrophoretic particle taking the organic pigment as an inner core and a copolymer rich in polar groups as an outer shell.
  2. 2. The yellow electrophoretic particle with a high electronegativity core-shell structure of claim 1, wherein the silane coupling agent containing carbon-carbon double bonds is any one of gamma-methacryloxypropyl trimethoxysilane (KH 570), 3-acryloxypropyl trimethoxysilane or vinyl trimethoxysilane, the organic yellow pigment is benzidine yellow, and the polymerizable charge control agent monomer is any one of methacrylic acid, acrylic acid, methyl methacrylate and methyl acrylate.
  3. 3. The method for preparing the high electronegativity core-shell structure yellow electrophoretic particles as claimed in claim 2, which is characterized by comprising the following steps: S1, dispersing an organic yellow pigment in absolute ethyl alcohol, carrying out water bath ultrasonic treatment to uniformly disperse the organic yellow pigment, and then magnetically stirring the organic yellow pigment for 2-8 hours to obtain pigment suspension slurry; S2, dissolving a silane coupling agent containing carbon-carbon double bonds in absolute ethyl alcohol, then dropwise adding deionized water into the pigment suspension slurry obtained in the step S1, regulating the pH to 4-6 by using glacial acetic acid, stirring for 30-60 min, reacting for 2-6 h at 50-75 ℃, and washing a product by using absolute ethyl alcohol to obtain modified organic pigment particles; And S3, dissolving the modified organic pigment particles in the step S2 in absolute ethyl alcohol, carrying out water bath ultrasonic treatment to ensure that the modified organic pigment particles are uniformly dispersed, introducing nitrogen to remove air, then adding styrene and polymerizable charge control agent monomers, carrying out magnetic stirring, heating the water bath to 50-75 ℃, then dropwise adding absolute ethyl alcohol solution of azodiisobutyronitrile, and carrying out polymerization reaction for 4-12 hours to obtain the high electronegativity core-shell structure yellow electrophoretic particles.
  4. 4. The preparation method of the magnetic stirring device is characterized in that in the step S1, the mass volume ratio of the organic yellow pigment to the absolute ethyl alcohol is 1:50-200, g/mL, the water bath ultrasonic time is 20-60 min, the water bath ultrasonic power is 40 kHz, and the magnetic stirring rotating speed is 300-800 rpm.
  5. 5. The preparation method of the water-based paint, according to claim 3, wherein in the step S2, the dropping speed is 0.5-2 mL/min, and the volume ratio of the silane coupling agent containing carbon-carbon double bonds to the absolute ethyl alcohol to the deionized water is 1:150-300:1-10.
  6. 6. The preparation method of the modified organic pigment according to claim 3, wherein in the step S3, the mass volume ratio of the modified organic pigment particles to the anhydrous ethanol, the styrene and the polymerizable charge control agent monomer is 1:50-200:5-20:0.5-2 g: mL, the concentration of the anhydrous ethanol solution of the azodiisobutyronitrile is 0.003-0.008 g/mL, the dropping speed is 0.2-1 mL/min, the water bath ultrasonic time is 20-60 min, the water bath ultrasonic power is 40 kHz, and the magnetic stirring rotating speed is 300-800 rpm.
  7. 7. The yellow electrophoresis particle with high electronegativity and core-shell structure prepared by the preparation method of any one of claims 3 to 6.
  8. 8. The use of the high electronegativity core-shell structure yellow electrophoretic particles according to claim 8 for preparing a full-color electrophoretic display.

Description

Yellow electrophoresis particle with high electronegativity core-shell structure, and preparation method and application thereof Technical Field The invention belongs to the technical field of electronic paper display, and relates to high electronegativity core-shell structure yellow electrophoretic particles, and a preparation method and application thereof. Background The electrophoretic display technology is used as a reflective display technology, and has the remarkable advantages of low cost, low refreshing energy consumption, no eye injury, wide viewing angle and the like, and is widely applied to the fields of electronic book readers, electronic shelf labels, intelligent logistics labels and the like. The electrophoretic display technology encapsulates the electrophoretic color developing particles in the display panel, when the electrophoretic display is connected with a power supply and voltage is applied, the electrophoretic color developing particles with different chargers directionally move under the action of the electric field force, so that reflective display imaging is realized. In recent years, black-and-white electrophoretic display devices have been successfully commercialized, and a plurality of companies such as amazon, hanwang and the like have successively introduced a large number of electronic paper products which are close to the lives and originality of people. However, with the development of technology and age, it is difficult for the conventional black-and-white electrophoretic display to meet the increasingly diversified cultural demands of consumers, so the full-color electrophoretic display technology is the most urgent development demand. The color electrophoretic particles are a key technology for preparing the full-color electrophoretic display, are mainly prepared from inorganic pigments or organic pigments, and the color particles with excellent performance are beneficial to improving the refreshing time of the color display and obtaining a wider color gradation and color gamut range. The inorganic pigment particles have good light resistance, good weather resistance and swelling resistance, and the inorganic pigment synthesized by a specific method generally has a uniform shape, but the particles are easy to sink in a dispersion medium due to the fact that the inorganic pigment generally has large density, and the bistable property of electrophoretic display is damaged. The organic pigment has the advantages of bright color, high chromaticity, wide color system, low density and the like, and is more suitable for preparing color electrophoretic particles. At present, the color electrophoretic particles generally have the problems of low charge density, insufficient agglomeration stability, poor light resistance, irregular shape, slow electric field response and the like, and severely restrict the performance improvement of the color electrophoretic display technology. Therefore, a new generation of high-performance color electrophoretic particles needs to be developed, so as to improve the application prospect of the full-color electrophoretic display. Disclosure of Invention In view of the above, the present invention aims to provide a yellow electrophoresis particle with a high electronegativity core-shell structure, a preparation method and an application thereof. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a high electronegativity core-shell structure yellow electrophoresis particle, which is formed by carrying out surface chemical modification on an organic yellow pigment by a silane coupling agent containing carbon-carbon double bonds, carrying out in-situ polymerization reaction on the organic yellow pigment and a styrene and polymerizable charge control agent monomer, and taking the organic pigment as a core and a copolymer rich in polar groups as a shell; Preferably, the silane coupling agent containing carbon-carbon double bond is any one of gamma-methacryloxypropyl trimethoxysilane (KH 570), 3-acryloxypropyl trimethoxysilane or vinyl trimethoxysilane, the organic yellow pigment is benzidine yellow, and the polymerizable charge control agent monomer is any one of methacrylic acid, acrylic acid, methyl methacrylate and methyl acrylate; further, the preparation method of the high electronegativity core-shell structure yellow electrophoretic particle comprises the following steps: S1, dispersing an organic yellow pigment in absolute ethyl alcohol, carrying out water bath ultrasonic treatment to uniformly disperse the organic yellow pigment, and then magnetically stirring the organic yellow pigment for 2-8 hours to obtain pigment suspension slurry; S2, dissolving a silane coupling agent containing carbon-carbon double bonds in absolute ethyl alcohol, then dropwise adding deionized water into the pigment suspension slurry obtained in the step S1, regulating the pH to 4-6 by using g