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US-12624192-B2 - Electro-polarizable particle, preparation method thereof, and electro-polarizable allochroic optical film

US12624192B2US 12624192 B2US12624192 B2US 12624192B2US-12624192-B2

Abstract

The present application relates to electro-polarizable particle, a preparation method thereof and an electro-polarizable allochroic optical film, belonging to the technical field of electro-polarizable allochroic optical film devices. The present application discloses electro-polarizable particle, whose raw materials include a metal iodide, a carboxylic acid nitrogenous organic molecule, iodine and a cellulose suspending agent; the electro-polarizable particle have a rod-shaped structure, a length of 100-2000 nm, and a width of 10-200 nm. The present application further discloses a preparation method for electro-polarizable particle, and also discloses an electro-polarizable allochroic optical film containing the electro-polarizable particle.

Inventors

  • PengFei WANG

Assignees

  • Shaoxing Difei New Material Co., Ltd.

Dates

Publication Date
20260512
Application Date
20220801
Priority Date
20210413

Claims (7)

  1. 1 . An electro-polarizable allochroic optical film, comprising an electro-polarizable particle; the electro-polarizable particle comprising a metal iodide, a carboxylic acid nitrogenous organic molecule, iodine and a cellulose suspending agent; wherein the electro-polarizable particle has a rod-shaped structure, a length of 100-2000 nm, and a width of 10-200 nm; wherein the carboxylic acid nitrogenous organic molecule is one or more selected from the group consisting of:
  2. 2 . The electro-polarizable allochroic optical film according to claim 1 , wherein the electro-polarizable allochroic optical film comprises a substrate and a first conductive film, an electro-polarizable allochroic film and a second conductive film sequentially arranged on the substrate; and the electro-polarizable allochroic film comprises the electro-polarizable particle.
  3. 3 . The electro-polarizable allochroic optical film according to claim 2 , wherein the first conductive film is one selected from the group consisting of indium tin oxide conductive film, silver nanowire conductive film, copper nanowire conductive film and zine oxide conductive film; and the second conductive film is one selected from the group consisting of indium tin oxide conductive film, silver nanowire conductive film, copper nanowire conductive film and zine oxide conductive film.
  4. 4 . The electro-polarizable allochroic optical film according to claim 3 , wherein a preparation process for the electro-polarizable allochroic optical film comprises the following steps: a) mixing the electro-polarizable particle in a dispersion liquid of the electro-polarizable particle with an oligomer uniformly by ultrasound, and rotary evaporating a solvent to obtain an emulsion of the electro-polarizable particle and the oligomer; b) adding a photo-curing initiator and an organic solvent to an ultraviolet (UV) crosslinked cured polymer, stirring uniformly, and rotary evaporating the organic solvent to obtain a liquid; c) mixing the emulsion and the liquid, stirring uniformly and defoaming under vacuum to obtain a coating slurry; and d) coating the coating slurry between the first conductive film and the second conductive film, and then performing photo curing to obtain the electro-polarizable allochroic optical film; wherein a preparation method for the electro-polarizable particle comprises the following steps: 1) adding the cellulose suspending agent to the solvent under stirring, raising a reaction temperature to 25-80° C., successively adding the iodine, the carboxylic acid nitrogenous organic molecule, the metal iodide, a fatty alcohol, and deionized water, and keeping reacting at 25-80° C. for 1-20 h; and 2) centrifuging and washing a resultant obtained in the step 1), and dispersing a precipitate into the solvent to obtain the dispersion liquid of the electro-polarizable particle.
  5. 5 . The electro-polarizable allochroic optical film according to claim 4 , wherein the oligomer is one or two of poly iso-octyl methacrylate and poly decyl methacrylate; a viscosity of the poly iso-octyl methacrylate and the poly decyl methacrylate is 500-10000 cps; and in the emulsion, a mass ratio of the electro-polarizable particle in the dispersion liquid of the electro-polarizable particle to the oligomer is 1:(2-50).
  6. 6 . The electro-polarizable allochroic optical film according to claim 5 , wherein in the step b), the UV crosslinked cured polymer is one or two of polyacrylate-polystyrene copolymer and polyacrylate-polysiloxane copolymer; a viscosity of the polyacrylate-polystyrene copolymer and the polyacrylate-polysiloxane copolymer is 2000-20000 cps; the photo-curing initiator is 2,4,6-trimethylbenzoyl diphenyl phosphine oxide; and an addition amount of the photo-curing initiator is 0.1%-3% by mass based on the UV crosslinked cured polymer.
  7. 7 . The electro-polarizable allochroic optical film according to claim 5 , wherein in the step c), the emulsion and the liquid are mixed by a mass ratio of 1:(1-10); and the organic solvent is one or more selected from the group consisting of tetrahydrofuran, ethyl acetate, dichloromethane, acetone and dioxane.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of international PCT application No. PCT/CN2022/075889, filed on Feb. 10, 2022, which claims a priority and benefit of China patent application No. 202110395672.7, filed on Apr. 13, 2021. The entireties of international PCT application No. PCT/CN2022/075889 and China patent application No. 202110395672.7 are hereby incorporated by reference herein and made a part of this specification. TECHNICAL FIELD The present application relates to the field of electro-polarizable allochroic optical film devices, and in particular, to an electro-polarizable particle, a preparation method thereof, and an electro-polarizable allochroic optical film. BACKGROUND ART Electrochromic glass (film) is widely used in smart home, office partition, architecture, automobile, high-speed railway and other fields due to its numerous functions, such as shading, heat insulation, energy saving, privacy protection and so on. It has great social significance and commercial value. Electrochromic technology has been developed for a long time and is very challenging. At present, there are two kinds of smart glasses based on electrochromic technology in the market: smart glasses based on polymer dispersed liquid crystal (PDLC) and smart glasses based on conductive polymer electrochromic (EC). Polymer dispersed liquid crystal (PDLC) technology is to disperse micron sized liquid crystal small molecule microdroplets in the organic solid polymer matrix. By adjusting the voltage, it can realize the transformation from hazy and opaque state to transparent state. However, PDLC smart glass has no shading property, narrow visible light transmittance range, unsatisfactory energy-saving effect, and limited application scenarios. Conductive polymer electrochromic (EC) technology can achieve a wider transmittance range compared with PDLC, and has good shading and energy-saving effects. However, it has complex processing technology, slow allochroic speed, short service life, high cost and high price. It is only used in a few devices such as upmarket sports cars and Boeing aircraft. The electro-polarizable particle is an organic-inorganic hybrid particle with a certain shape. The organic-inorganic hybrid particle is anisotropic and can be polarized and deflected under electric field (magnetic field). After being made into a device, it shows the allochroic function. The devices made of the electro-polarizable particle have characteristics such as wide transmittance range and fast discoloration, and have a wide application prospect, but there are few reports in China. SUMMARY In order to obtain an electro-polarizable allochroic optical film device with wide transmittance range and fast discoloration, the present application provides an electro-polarizable particle, a preparation method thereof, and an electro-polarizable allochroic optical film. In a first aspect, the present application provides an electro-polarizable particle, which adopt the following technical solution: an electro-polarizable particle, including a metal iodide, a carboxylic acid nitrogenous organic molecule, iodine and a cellulose suspending agent; the electro-polarizable particle have a rod-shaped structure, a length of 100-2000 nm, and a width of 10-200 nm. In a second aspect, the present application provides a preparation method for an electro-polarizable particle, which adopts the following technical solution: a preparation method for an electro-polarizable particle, including the following steps: 1) adding a cellulose suspending agent to a solvent under stirring, raising a reaction temperature to 25-80° C., then successively adding iodine, a carboxylic acid nitrogenous organic molecules, a metal iodide, a fatty alcohol and deionized water, and continuing reacting at 25-80° C. for 1-20 h; 2) a resultant from step 1) is centrifuged and washed, and a precipitate is dispersed into the solvent to obtain the dispersion liquid of the electro-polarizable particle. In some embodiments, the solvent is ethyl acetate. In some embodiments, the cellulose suspending agent is one or more selected from the group consisting of ethyl cellulose, cellulose acetate, cyanoethyl cellulose and nitrocellulose. In some embodiments, the carboxylic acid nitrogenous organic molecule is one or more of the following structures: In some embodiments, the metal iodide is one or more selected from the group consisting of copper iodide, calcium iodide, magnesium iodide and barium iodide. In some embodiments, the fatty alcohol is one or more selected from the group consisting of methanol, ethanol, isopropanol, n-butanol, n-heptanol and n-octanol. In some embodiments, in step 1), a dosage ratio of iodine, the carboxylic acid nitrogenous organic molecule, the metal iodide, the cellulose suspending agent, the fatty alcohol, deionized water and the solvent is 2.0-4.5 g:3.0-5.3 g:1.2-4.5 g:3.0-5.0 g:3.6-8.4 mL:0.2-1.5 g:45-70 mL. In some embodiments, the