Low-voltage driven smart dynamic dimming film and preparation method thereof

Abstract

The application relates to the technical field of light-adjusting films, and particularly discloses a low-voltage-driven intelligent dynamic light-adjusting film and a preparation method thereof. The low-voltage-driven intelligent dynamic light-adjusting film comprises a transparent substrate, a transparent electrode and an electrophoretic medium layer, the transparent electrode is plated on one side of the transparent substrate, the transparent electrode is bonded with the electrophoretic medium layer through an adhesive, and the components of the electrophoretic medium layer include electrophoretic particle microcapsules and a binder. The electrophoretic particle microcapsules are used for storing an internal phase, the components of the internal phase include electrophoretic particles, a charge control agent, a stabilizer and a dispersed mobile phase, and the components of the stabilizer include polyisobutylene succinimide. The polyisobutylene succinimide is used for increasing the steric hindrance of the inner surface of the capsule wall, hindering the agglomeration of the electrophoretic particles on the inner surface of the capsule wall, and increasing the light transmittance adjustment range of the light-adjusting film under low-voltage driving.

Description

Technical Field

[0001] This application relates to the field of dimming film technology, and more specifically, to a low-voltage driven intelligent dynamic dimming film and its preparation method. Background Technology

[0002] Dimming films are a new type of material that can present different light transmission states. Electro-controlled dimming films are one of the common types of dimming films. The voltage across the two ends of an electro-controlled dimming film changes its state. By controlling the voltage, the electro-controlled dimming film can switch between a transparent state and an opaque state.

[0003] In related technologies, most electrochromic dimming films adopt a sandwich structure. This structure requires two transparent substrates with transparent electrodes coated on their surfaces, with a dielectric layer placed between the two transparent electrodes. When a voltage is applied to the transparent electrodes on both sides of the dielectric layer, the dielectric layer changes its transparency under the influence of the voltage. Taking liquid crystal electrochromic dimming films as an example, to achieve a sufficiently large transmittance adjustment range, currently available liquid crystal electrochromic dimming films need to operate under voltage control of hundreds of volts.

[0004] Regarding the aforementioned technologies, the inventors believe that although the liquid crystal electro-controlled dimming film in these technologies achieves electro-controlled dimming, its operating voltage is too high, resulting in high energy consumption and certain safety hazards. Conversely, operating directly at a low voltage would limit the adjustable range of the dimming film's transmittance, making it difficult to meet normal usage requirements. Summary of the Invention

[0005] In related technologies, the operating voltage of electrically controlled dimming films is too high, which not only consumes a lot of energy but also poses certain dangers. However, if they are operated directly at low voltage, the range of light transmittance adjustment of the dimming film will be limited, making it difficult to meet normal use requirements. To improve this deficiency, this application provides a low-voltage driven intelligent dynamic dimming film and its preparation method.

[0006] In a first aspect, this application provides a low-voltage driven intelligent dynamic dimming film, employing the following technical solution: a low-voltage driven intelligent dynamic dimming film, the intelligent dynamic dimming film comprising a transparent substrate, a transparent electrode, and an electrophoretic dielectric layer, the transparent electrode being deposited on one side of the transparent substrate, the transparent electrode being bonded to the electrophoretic dielectric layer by an adhesive, the electrophoretic dielectric layer comprising electrophoretic particle microcapsules and an adhesive, the electrophoretic particle microcapsules being used to store an internal phase, the internal phase comprising electrophoretic particles, a charge control agent, a stabilizer, and a dispersed mobile phase, the adhesive comprising nano-carbon black, the capsule wall of the electrophoretic particle microcapsules comprising gelatin, the electrophoretic particles comprising nano-carbon black, and the stabilizer comprising polyisobutylene succinimide.

[0007] By employing the above technical solution, this application stores electrophoretic ions in electrophoretic particle microcapsules, and then assembles the electrophoretic particle microcapsules and adhesive into an electrophoretic dielectric layer. When there is no voltage across the electrophoretic dielectric layer, the electrophoretic particles in the electrophoretic particle microcapsules undergo Brownian motion in the dispersed mobile phase. External light is absorbed, scattered, or reflected by the electrophoretic particles, and the dimming film is in an opaque state. When an AC voltage is applied to both sides of the electrophoretic dielectric layer through a transparent electrode, the adhesive fixes the position of the electrophoretic particle microcapsules, while the electrophoretic particles undergo directional movement under the action of the AC voltage until they concentrate in a certain area within the electrophoretic particle microcapsules. Due to the aggregation of dimming particles, the absorption, scattering, or reflection of light is weakened, thus the dimming film becomes transparent.

[0008] In the electrophoretic particle microcapsules of this application, the polar groups of polyisobutylene succinimide can be adsorbed on the inner side of the capsule wall, increasing the steric hindrance of the inner surface of the capsule wall and reducing the possibility of aggregation of electrophoretic particles on the inner surface of the capsule wall. This allows the electrophoretic particles to be more fully dispersed in the opaque state, which helps to increase the adjustment range of the light transmittance of the dimming film. Because the adjustment range of the light transmittance of the dimming film of this application is increased, it is not necessary to use a voltage of hundreds of volts for control, but can achieve low-voltage drive, which not only helps to reduce energy consumption, but also reduces the danger of the dimming film.

[0009] Preferably, the internal phase also includes graphene.

[0010] By adopting the above technical solution, graphene can be mutually adsorbed with electrophoretic particles in the internal phase, which helps to enhance the conductivity of electrophoretic particles and increase the adjustment range of the light transmittance of the dimming film.

[0011] Preferably, the method for preparing the electrophoretic particle microcapsules includes the following steps: (1) Add gelatin to deionized water and heat to dissolve to obtain a gelatin solution; dissolve gum arabic in deionized water and heat to dissolve to obtain a gum arabic solution; mix electrophoretic particles, charge control agent, stabilizer and dispersed mobile phase to obtain internal phase; (2) After heating the internal phase, add it to the gelatin solution to obtain a capsule suspension. Add the gum arabic solution and acidifier to the capsule suspension one after the other, and then stir and keep the mixture warm. (3) Cool the mixture, then add the curing agent to the mixture, then heat the mixture, after heating, stir and filter the mixture, and then dry it to obtain electrophoretic particle microcapsules.

[0012] By adopting the above technical solution, this application first prepared a gelatin solution, a gum arabic solution and an internal phase, and then formed a film by the reaction of gelatin and gum arabic. The film encapsulated the droplets of the internal phase. Then, an aldehyde curing agent was used to cure the gelatin, and finally microcapsules storing the internal phase were obtained.

[0013] Preferably, the stabilizer comprises potassium perfluorobutyl sulfonate.

[0014] By adopting the above technical solution, potassium perfluorobutyl sulfonate is a surfactant. The hydrophilic end of potassium perfluorobutyl sulfonate can be adsorbed on the inner side of the capsule wall of the electrophoretic particle microcapsule, while the hydrophobic end of potassium perfluorobutyl sulfonate is perfluorobutyl, which hinders the adhesion and aggregation of electrophoretic particles on the inner side of the capsule wall, and helps to increase the adjustment range of the light transmittance of the dimming film.

[0015] Preferably, the electrophoretic particles comprise modified carbon black, which is prepared according to the following method: (1) Mix nano carbon black, potassium persulfate, perfluorohexylethylene and deionized water to obtain raw material solution; (2) Stir the raw material liquid under sealed conditions and nitrogen protection, and heat the raw material liquid at the same time. After heating, wash and centrifuge the product, and then dry it to obtain modified carbon black.

[0016] By employing the above technical solution, this application utilizes potassium persulfate to initiate the grafting of nano-carbon black with perfluorohexylethylene, grafting perfluorohexyl groups onto the surface of the nano-carbon black to obtain modified carbon black. The introduction of perfluorohexyl groups makes it less likely for the modified carbon black particles to agglomerate in the dispersed mobile phase and on the inner surface of the capsule wall, which helps to increase the adjustment range of the light transmittance of the dimming film.

[0017] Preferably, the adhesive comprises 60-80 parts of EVA resin, 10-15 parts of SBS, 20-30 parts of rosin-modified phenolic resin, 2-4 parts of modified zinc oxide, 5-7 parts of benzoyl peroxide, 1-1.5 parts of ultraviolet absorber, 1-2 parts of 2,6-di-tert-butyl-p-cresol, 30-50 parts of ethyl acetate, and 10-20 parts of acetone.

[0018] By adopting the above technical solution, the composition of the adhesive is optimized, which helps to improve the adhesion between the electrophoretic dielectric layer and the transparent electrode.

[0019] Preferably, the VA content in the EVA resin is 27-35%.

[0020] By adopting the above technical solution, the VA content in EVA resin is optimized, which helps to improve the adhesive effect while ensuring processing performance.

[0021] Preferably, the adhesive also includes zinc oxide.

[0022] By adopting the above technical solution, zinc oxide in the adhesive can improve the strength of the adhesive after curing, which helps to improve the adhesion between the electrophoretic dielectric layer and the transparent electrode.

[0023] Preferably, the adhesive further comprises modified zinc oxide, and the method for preparing the modified zinc oxide includes the following steps: (1) Add zinc nitrate hexahydrate and sodium hydroxide to a container, then add deionized water to dissolve them, then add vinyl acetate, methanol and initiator, adjust the temperature to 60-65℃ and stir and heat for 1-1.5h to obtain a mixture, and seal it for later use. (2) Heat the mixture at 110-130℃ for 10-12 hours, then cool it down to 70-80℃ and keep it at that temperature for 6-8 hours. After filtration and drying, the green body is obtained. (3) Sinter the blank at 500-600℃ for 2-4 hours, and then grind the sintered product to obtain modified zinc oxide.

[0024] By adopting the above technical solution, the decomposition of organic matter during the sintering process results in a large number of pores inside the sintered green body. After grinding, the green body yields modified zinc oxide. The porous structure of the modified zinc oxide can absorb water, reducing the change in internal stress of the adhesive caused by surface water adsorption. This helps improve the adhesion between the electrophoretic dielectric layer and the transparent electrode, reducing the possibility of debonding.

[0025] Secondly, this application provides a method for preparing a low-voltage driven intelligent dynamic dimming film, which adopts the following technical solution.

[0026] A method for preparing a low-voltage driven smart dynamic dimming film includes the following steps: (1) Add electrophoretic particle microcapsules to the binder to obtain electrophoretic medium colloid; deposit a layer of transparent electrode on the surface of each of the two transparent electrodes for later use; (2) Apply adhesive to the surface of the transparent electrode, and then apply electrophoretic medium colloid between the two transparent electrodes in a roll-to-roll manner; (3) The adhesive is cured by ultraviolet irradiation at 100-105℃ to obtain a low-voltage driven intelligent dynamic dimming film.

[0027] By adopting the above technical solution, this application first prepared an electrophoretic dielectric colloid, and then cured the electrophoretic dielectric colloid and the adhesive together to achieve the formation of the electrophoretic dielectric film and the bonding of the electrophoretic dielectric film to the transparent electrode, thus obtaining an intelligent dynamic dimming film.

[0028] In summary, this application has the following beneficial effects: 1. This application stores electrophoretic ions in electrophoretic particle microcapsules, then assembles the electrophoretic particle microcapsules and adhesives into an electrophoretic dielectric layer, and uses polyisobutylene succinimide to increase the steric hindrance of the inner surface of the capsule wall, which prevents the aggregation of electrophoretic particles on the inner surface of the capsule wall and reduces the AC voltage required to drive the electrophoretic particles. This not only helps to reduce energy consumption, but also reduces the danger of the dimming film.

[0029] 2. The preferred internal phase components in this application also include graphene, which can enhance the conductivity of electrophoretic particles, making the electrophoretic particles easier to drive by AC voltage, and helping to increase the transmittance adjustment range of the dimming film. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially. Example

[0031] Examples 1-5 The following description uses Example 1 as an example.

[0032] Example 1 In this embodiment, the internal phase is composed of electrophoretic particles, charge control agent, stabilizer and dispersed mobile phase mixed in a weight ratio of 1:4:2.6:14. The electrophoretic particles are nano-carbon black, and the nano-carbon black selected is Emperor 2000 carbon black with an average particle size of 60 nm. The charge control agent is sorbitol trioleate, the stabilizer is polyisobutylene succinimide, and the dispersed mobile phase is toluene.

[0033] The microcapsules in this embodiment were prepared according to the following method: (1) Add gelatin to deionized water and heat at 40°C to dissolve to obtain a 3% gelatin solution; dissolve gum arabic in deionized water and heat at 40°C to dissolve to obtain a 3% gum arabic solution; mix electrophoretic particles, charge control agent, stabilizer and dispersed mobile phase to obtain internal phase; (2) Heat the internal phase to 40°C and then add it to the gelatin solution to obtain a capsule suspension. Add the gum arabic solution and acidifier to the capsule suspension one after the other, and then stir the mixture for 40 minutes. Keep the mixture at 40°C during the stirring process. In this step, the amount of gum arabic solution is the same as the weight of the gelatin solution. The acidifier is acetic acid, which adjusts the pH of the mixture to 4.95. (3) Cool the mixture to 5°C, then add the curing agent glutaraldehyde (2% of the weight of the gelatin aqueous solution) to the mixture, then heat the mixture to 25°C. After heating, stir and filter the mixture, and then dry it to obtain electrophoretic particle microcapsules.

[0034] In this embodiment, the adhesive is prepared according to the following method: (1) Mix gelatin and gum arabic in a mass ratio of 1:1, add deionized water to obtain a gelatin / gum arabic mixture; (2) Mix 6 wt% nano carbon black (Emperor 2000), 3 wt% magenta pigment (Z-21) and 2 wt% cyan blue pigment (phthalocyanine blue K6850), add deionized water to obtain a dye dispersion; (3) Add the dye dispersion to the gelatin / gum arabic mixture to obtain the adhesive.

[0035] In this embodiment, the adhesive is composed of the following raw materials: 58 kg EVA resin, 9 kg SBS, 18 kg rosin-modified phenolic resin, 4 kg benzoyl peroxide, 0.8 kg ultraviolet absorber, 0.8 kg 2,6-di-tert-butyl-p-cresol, 28 kg ethyl acetate, and 8 kg acetone. The VA content in the EVA resin is 25%.

[0036] This embodiment provides a low-voltage driven intelligent dynamic dimming film, comprising two transparent substrates, a transparent electrode deposited on one side of the transparent substrates, and an electrophoretic dielectric layer disposed between the two transparent electrodes. The transparent electrodes are bonded to the electrophoretic dielectric layer by an adhesive. The transparent substrates are colorless transparent PET layers with a thickness of 125 μm, a visible light transmittance of 86%, and a haze of 0.6%. The transparent electrodes are made of ITO, and the electrophoretic dielectric layer comprises electrophoretic particle microcapsules and an adhesive.

[0037] In this embodiment, the low-voltage driven intelligent dynamic dimming film is prepared according to the following steps: (1) Add the electrophoretic particle microcapsules to the binder to obtain the electrophoretic medium colloid; deposit a layer of transparent electrode on the surface of each of the two transparent electrodes for later use; in this step, the electrophoretic particle microcapsules and the binder are mixed in a weight ratio of 4:6. (2) Apply adhesive to the surface of the transparent electrode, and then apply electrophoretic medium colloid between the two transparent electrodes in a roll-to-roll manner; (3) The adhesive was cured by ultraviolet irradiation at 105℃ to obtain a low-voltage driven intelligent dynamic dimming film.

[0038] Example 2 The difference between this embodiment and Embodiment 1 is that the internal phase composition also includes graphene, and the amount of graphene used is 10% of the weight of the electrophoretic particles.

[0039] Example 3 The difference between this embodiment and Example 1 is that the stabilizer is a mixture of polyisobutylene succinimide and potassium perfluorobutyl sulfonate in a weight ratio of 8:1.

[0040] Example 4 The difference between this embodiment and Embodiment 1 is that the electrophoretic particles are composed of a 1:1 weight ratio of nano-carbon black and modified carbon black, and the modified carbon black is prepared according to the following method: (1) Mix 1000g of nano carbon black, 200g of potassium persulfate, 2000g of perfluorohexylethylene and 30L of deionized water to obtain the raw material solution; (2) Stir the raw material liquid under sealed and nitrogen protection conditions, and heat the raw material liquid to 80°C. After heating for 8 hours, wash the product with tetrahydrofuran. After washing, let it stand for 12 hours to precipitate, then centrifuge at 7500 rpm for 60 minutes, and then dry it in an oven at 105°C to obtain modified carbon black.

[0041] Examples 5-8 As shown in Table 1, the difference between Example 1 and Examples 5-8 is that the raw material ratio of the adhesive is different.

[0042] Table 1 Raw material ratio of adhesive Examples 9-12 As shown in Table 2, the difference between Examples 9-12 and Example 6 is that the VA content in the EVA resin is different.

[0043] Table 2. VA content in EVA resin VA content / % 25 27 31 35 38 Example 13 The difference between this embodiment and Embodiment 6 is that the adhesive component also includes zinc oxide with an average particle size of 120 μm, and the amount of zinc oxide is 5% of the weight of EVA resin.

[0044] Example 14 The difference between this embodiment and Embodiment 6 is that the adhesive component further includes modified zinc oxide with an average particle size of 120 μm. The amount of modified zinc oxide is 5% of the weight of EVA resin. The preparation method of modified zinc oxide includes the following steps: (1) Add zinc nitrate hexahydrate and sodium hydroxide to a container in a weight ratio of 3:1, add deionized water to dissolve, then add vinyl acetate (30% of the weight of zinc nitrate hexahydrate), methanol (8% of the weight of zinc nitrate hexahydrate), and initiator (potassium persulfate, 2% of the weight of zinc nitrate hexahydrate) to initiate the polymerization reaction. Adjust the temperature to 60°C, stir and keep warm for 1 hour to obtain a mixture, and seal it for later use. (2) The mixture is heated at 120°C for 11 hours, then cooled to 75°C and kept at that temperature for 7 hours. After drying, a green body is obtained. (3) The blank was sintered at 550℃ for 3 hours, and then the sintered product was ground to obtain modified zinc oxide.

[0045] Comparative Example Comparative Example 1 An electrochromic thin film prepared according to Example 1 of Chinese Patent No. CN112379546B.

[0046] Comparative Example 2 The difference between this comparative example and Example 3 is that the stabilizer used is polystyrene with a number average molecular weight of 3500.

[0047] Performance testing methods I. Transmittance Adjustment Range Test The color-changing effect was characterized by visible light transmittance, and the color-changing response time was characterized by the change time of visible light transmittance. Visible light transmittance (i.e., visible light transmittance) was tested according to GB / T2680-1994, "Determination of Visible Light Transmittance, Ultraviolet Transmittance and Related Window Glass Parameters for Architectural Glass". Since the dimming film of Comparative Example 1 darkens when powered on and brightens when powered off, which is the opposite of the dimming film of this application, the transmittance adjustment range was characterized by the difference in transmittance between the test voltage condition and the no-power (0V) condition.

[0048] The detection methods for each embodiment and Comparative Example 2 are as follows: AC voltages of 0V, 36V and 110V are applied sequentially to both ends of the dimming film, and the corresponding visible light transmittance is measured.

[0049] The detection method for Comparative Example 1 is as follows: AC voltages of 0V, 36V and 110V are applied sequentially to both ends of the dimming film, and the corresponding visible light transmittance is measured.

[0050] The test results of visible light transmittance of Examples 1-4 and Comparative Examples 1-2 are shown in Table 3.

[0051] Table 3 II. Dimming film peel strength test The equipment used in the experiment was a peel strength tester. The two sides of the electrophoretic particle dimming layer being tested were spliced ​​with PET films coated with ITO electrodes to form the sample.

[0052] During the test, the ends of the two PET films were fixed with clamps. The PET film with ITO electrode was 800mm×400mm in size, and the bonding area of ​​the two sets of PET films with ITO electrode was 50×800mm.

[0053] To ensure accurate positioning of the sample between the clamps and uniform distribution of the applied tensile force across the sample width, the machine is started, and the upper and lower clamps separate at a constant rate. The separation rate of the clamps is 100 mm / min. The corresponding peel strength value is read, and the ratio between the peel strength of Examples 1 and 5-14 and the peel strength of Example 1 is calculated. This ratio is recorded as the relative peel strength. The results are shown in Table 4. The reason why Example 12 could not be measured is that the viscosity of the EVA resin was too high, making it impossible to process normally.

[0054] Table 4 Example 1 100.0 Example 10 107.9 Example 5 103.6 Example 11 110.3 Example 6 104.1 Example 12 Unable to measure Example 7 103.2 Example 13 106.7 Example 8 101.9 Example 14 108.9 Example 9 105.4 / / Combining Example 1 and Comparative Examples 1-2 with Table 3, it can be seen that the transmittance measured at 36V and 110V in Example 1 is close, with differences of 54.1% and 54.2% respectively compared to the measurement results at 0V. However, the transmittance measured at 36V in Comparative Example 1 is significantly higher than that measured at 110V, with differences of 23.8% and 39.9% respectively compared to the measurement results at 0V. This indicates that by using polyisobutylene succinimide as a stabilizer, this application reduces the aggregation of electrophoretic particles on the inner surface of the microcapsules, overcomes the defect of reduced transmittance adjustment range under low-voltage driving, and successfully optimizes the low-voltage driving effect of the intelligent dynamic dimming film.

[0055] As can be seen from Example 3 and Comparative Example 2 and Table 3, after replacing polyisobutylene succinimide with polystyrene in Comparative Example 2, the aggregation of electrophoretic particles on the inner surface of the microcapsules increased. Therefore, the transmittance decreased when driven by a low voltage of 36V, resulting in a smaller transmittance adjustment range.

[0056] As can be seen from Examples 1 and 2 and Table 3, graphene can enhance the conductivity of electrophoretic particles, making the electrophoretic particles more fully dispersed. Therefore, the dimming film can exhibit a wider range of light transmittance adjustment.

[0057] As can be seen from Examples 1 and 3 and Table 3, the hydrophilic end of potassium perfluorobutyl sulfonate can be adsorbed on the inner side of the capsule wall of the electrophoretic particle microcapsule, which helps to reduce the adhesion and aggregation of electrophoretic particles on the inner side of the capsule wall. Therefore, the dimming film can exhibit a larger range of light transmittance adjustment.

[0058] As can be seen from Examples 1 and 4 and Table 3, the introduction of perfluorohexyl makes it less likely for the modified carbon black particles to agglomerate in the dispersed mobile phase and on the inner surface of the capsule wall, reducing the difficulty of driving electrophoretic particles with AC voltage. Therefore, the dimming film can exhibit a wider range of transmittance adjustment.

[0059] As can be seen from Examples 1 and 5-8 and Table 4, the adhesive using the formulation of Examples 5-7 has better bonding strength.

[0060] As can be seen from Examples 6, 9-12 and Table 4, when the VA content of EVA resin is between 27-35%, the adhesive effect and transparency of the adhesive can be improved while ensuring processing performance.

[0061] As can be seen from Examples 6 and 13 and Table 4, zinc oxide in the adhesive can improve the strength of the adhesive after curing, which helps to improve the adhesion between the electrophoretic dielectric layer and the transparent electrode.

[0062] As can be seen from Examples 6 and 14 and Table 4, the porous structure of modified zinc oxide can absorb water into the particles, reducing the change in internal stress of the adhesive caused by water adsorption on the particle surface, which helps to improve the adhesion between the electrophoretic dielectric layer and the transparent electrode.

[0063] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A low-voltage driven intelligent dynamic dimming film, characterized in that, The intelligent dynamic dimming film includes a transparent substrate, a transparent electrode, and an electrophoretic dielectric layer. The transparent electrode is deposited on one side of the transparent substrate and is bonded to the electrophoretic dielectric layer by an adhesive. The electrophoretic dielectric layer comprises electrophoretic particle microcapsules and an adhesive. The electrophoretic particle microcapsules are used to store an internal phase. The internal phase comprises electrophoretic particles, a charge control agent, a stabilizer, and a dispersed mobile phase. The adhesive comprises nano-carbon black. The capsule wall of the electrophoretic particle microcapsules comprises gelatin. The electrophoretic particles comprise nano-carbon black. The stabilizer comprises polyisobutylene succinimide. The preparation method of the electrophoretic particle microcapsules includes the following steps: (1) Add gelatin to deionized water and heat to dissolve to obtain gelatin solution; dissolve gum arabic in deionized water and heat to dissolve to obtain gum arabic solution; mix electrophoretic particles, charge control agent, stabilizer and dispersed mobile phase to obtain internal phase; (2) After heating the internal phase, add it to the gelatin solution to obtain a capsule suspension. Add the gum arabic solution and acidifier to the capsule suspension one after the other, and then stir and keep the mixture warm. (3) Cool the mixture, then add the curing agent to the mixture, then heat the mixture, stir and filter the mixture after heating, and then dry it to obtain electrophoretic particle microcapsules; The stabilizer in the electrophoretic particle microcapsules includes potassium perfluorobutyl sulfonate; The electrophoretic particle microcapsules contain electrophoretic particles including modified carbon black, which is prepared according to the following method: (1) Mix nano carbon black, potassium persulfate, perfluorohexylethylene and deionized water to obtain raw material solution; (2) Stir the raw material liquid under sealed conditions and nitrogen protection, and heat the raw material liquid at the same time. After heating, wash and centrifuge the product, and then dry it to obtain modified carbon black.

2. The low-voltage driven intelligent dynamic dimming film according to claim 1, characterized in that, The internal phase also includes graphene.

3. The low-voltage driven intelligent dynamic dimming film according to claim 1, characterized in that, The adhesive comprises 60-80 parts EVA resin, 10-15 parts SBS, 20-30 parts rosin-modified phenolic resin, 2-4 parts modified zinc oxide, 5-7 parts benzoyl peroxide, 1-1.5 parts ultraviolet absorber, 1-2 parts 2,6-di-tert-butyl-p-cresol, 30-50 parts ethyl acetate, and 10-20 parts acetone.

4. The low-voltage driven intelligent dynamic dimming film according to claim 3, characterized in that, The VA content in the EVA resin is 27-35%.

5. The low-voltage driven intelligent dynamic dimming film according to claim 3, characterized in that, The adhesive also includes zinc oxide.

6. The low-voltage driven intelligent dynamic dimming film according to claim 3, characterized in that, The adhesive also includes modified zinc oxide, and the preparation method of the modified zinc oxide includes the following steps: (1) Add zinc nitrate hexahydrate and sodium hydroxide to a container, then add deionized water to dissolve them, then add vinyl acetate, methanol and initiator, adjust the temperature to 60-65℃ and stir and heat for 1-1.5h to obtain a mixture, and seal it for later use. (2) Heat the mixture at 110-130℃ for 10-12 hours, then cool it down to 70-80℃ and keep it at that temperature for 6-8 hours. After filtration and drying, the green body is obtained. (3) Sinter the blank at 500-600℃ for 2-4 hours, and then grind the sintered product to obtain modified zinc oxide.

7. The method for preparing the low-voltage driven intelligent dynamic dimming film according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Electrophoretic particle microcapsules are added to an adhesive to obtain an electrophoretic medium colloid; A layer of transparent electrode is deposited on the surface of each of the two transparent electrodes for later use; (2) Apply adhesive to the surface of the transparent electrode, and then apply electrophoretic medium colloid between the two transparent electrodes in a roll-to-roll manner; (3) The adhesive is cured by ultraviolet irradiation at 100-105℃ to obtain a low-voltage driven intelligent dynamic dimming film.

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