A low-voltage driven liquid light valve and its manufacturing method

Abstract

The present application relates to the technical field of liquid light valve, especially to a low-voltage driven liquid light valve and a preparation method thereof. The low-voltage driven liquid light valve comprises a first transparent electrode, a light-adjusting liquid and a second transparent electrode arranged in sequence. The light-adjusting liquid comprises light-adjusting particles, a suspension, a dispersing agent and an organic solvent. The dispersing agent is PVP. The present application further discloses a preparation method of the low-voltage driven liquid light valve, comprising the following steps: preparing light-adjusting particles; preparing a suspension; dissolving PVP in an organic solvent at a certain temperature; mixing the light-adjusting particles with the organic ester solution of PVP, and then mixing with the suspension to obtain the light-adjusting liquid; filling the light-adjusting liquid between the first transparent electrode and the second transparent electrode, and sealing. The liquid light valve prepared by the present application can be driven at low voltage, has fast response speed, short recovery time and good repeatability, and uses PVP which is stable at normal temperature and pressure as the dispersing agent, so the safety is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid light valve, in particular to a low-voltage driven liquid light valve and a preparation method thereof. BACKGROUND

[0002] Light valve is a kind of device that can realize light flux and color adjustment under external voltage driving. According to the working principle, the light valve can be divided into electrochromic (EC), polymer dispersed liquid crystal (PDLC) and suspended particle (also known as light modulation particle) device (SPD). Among them, EC is driven by direct current voltage, and the gain and loss of electrons in the inorganic / organic electrochromic material in the light modulation layer realizes the regulation of color light. PDLC and SPD are both driven by alternating current voltage, and the light flux is adjusted by the transformation of the internal liquid crystal molecules and the "Brown motion-directional arrangement" of the light modulation particles. Among them, SPD is favored by the market due to its good weather resistance, rich color and rapid response.

[0003] The traditional SPD is composed of two transparent electrodes and a light modulation layer sandwiched between the electrodes. The light modulation layer is composed of light modulation droplets containing light modulation particles and a substrate supporting the light modulation droplets. At present, such products have been applied to intelligent windows, aircraft portholes, office partitions and other fields. In SPD, the substrate and the light modulation liquid are both organic polymers, which often have poor repeatability, large organic gas emission and accurate refractive index matching between the two. More importantly, the substrate and the light modulation liquid need to be uniformly phase-separated, so their molecular weight / viscosity is large, which makes it difficult for the light modulation particles to rotate in the light modulation liquid, so the traditional SPD needs to be driven at a relatively high voltage (above 110V) to work normally.

[0004] Recently, SPD has abandoned the complex preparation process of traditional preparation process, and directly seals the light modulation liquid mixed with light modulation particles between two transparent electrodes, so as to obtain a simple structure of liquid SPD light valve. The advantages of such light valve include low working voltage, simple process and low production cost. However, its obvious shortcoming is that the light modulation particles are no longer limited in the light modulation droplets, but can perform Brown motion in a larger range, so they are more likely to agglomerate and deposit, thereby causing SPD failure. The existing technology generally uses nitrocellulose to disperse the light modulation particles, but the prepared SPD still has high driving voltage, slow response speed, long recovery time, and nitrocellulose is an inflammable and explosive material, which is difficult to obtain and has large pollution in production process. SUMMARY

[0005] In order to solve the above problems, on the basis of the existing liquid light valve, the present application provides a low-voltage driven liquid light valve and a preparation method thereof.

[0006] In one aspect, the present application provides a low-voltage driven liquid light valve, comprising a first transparent electrode, a light-adjusting liquid and a second transparent electrode arranged in sequence; the light-adjusting liquid comprises light-adjusting particles, a suspension, a dispersing agent and an organic solvent; the dispersing agent is PVP.

[0007] Further, the driving voltage of the liquid light valve is 25-40V.

[0008] Further, the light-adjusting particles are iodine quinine sulfate nanorods.

[0009] Further, the suspension is an acrylate polymer, and the viscosity thereof is 30-200cps.

[0010] Further, the molecular weight of the PVP is between 8000 and 220000.

[0011] More preferably, the molecular weight of the PVP is between 8000 and 58000.

[0012] Further, the organic solvent is selected from one or more of ethyl acetate, butyl acetate, isoamyl acetate, glyceryl triacetate and trioctyl trimellitate, and preferably is isoamyl acetate.

[0013] Further, the first transparent electrode and the second transparent electrode are selected from one or more of ITO conductive glass, ITO conductive film, nanosilver wire conductive film, nanocopper wire conductive film, PEDOT conductive film, graphene conductive film and carbon nanotube conductive film.

[0014] PVP is an excellent dispersing agent. In the synthesis and dispersion of many nanoparticles, PVP can be adsorbed on the surface of nanoparticles, thereby inhibiting the agglomeration of particles. In the present application, iodine quinine sulfate particles are prone to form agglomerates in the suspension, which leads to an increase in the working voltage of the product. The electrophilic reaction tendency of the pyrrole nitrogen in the PVP molecule is strong, so it can easily combine with the iodine element with a dense outer electron. When PVP is introduced into the suspension, it can be adsorbed on the surface of the iodine quinine sulfate nanoparticles, thereby promoting the dispersion thereof; at the same time, a layer of organic molecules is formed on the surface of the particles due to the PVP, which plays a good transition role between the particles and the suspension, and can effectively "lubricate" the particles, so the PVP can effectively reduce the voltage required for the particles to flip.

[0015] In another aspect, the present application also provides a preparation method of a low-voltage driven liquid light valve, comprising the following preparation steps:

[0016] (1) preparing light-adjusting particles;

[0017] (2) preparing a suspension;

[0018] (3) dissolving PVP in an organic ester solvent to obtain an organic ester solution of PVP;

[0019] (4) mixing the light-adjusting particles obtained in step (1) with the organic ester solution of PVP obtained in step (3) to obtain a mixed solution, and then mixing the obtained mixed solution with the suspension obtained in step (2) to obtain a light-adjusting solution;

[0020] (5) filling the light-adjusting solution obtained in step (4) between the first transparent electrode and the second transparent electrode, and then packaging to obtain the liquid light valve.

[0021] Further, the mass fraction of PVP in the organic ester solution of PVP in step (3) is 0.1-10%, preferably 0.5-5%.

[0022] Further, the mass ratio of the light-adjusting particles, the organic ester solution of PVP and the suspension in step (4) is x:y:100, wherein x is between 2 and 6, and y is between 10 and 50.

[0023] PVP itself can effectively inhibit particle agglomeration, but excessive use will cause the solution to be viscous, which in turn makes it difficult for the particles to flip under an electric field. The organic ester used in the present application as a solvent can reduce the viscosity of the suspension while dissolving PVP, but excessive use will cause the particles to agglomerate again. Therefore, the present application sets the above-mentioned mass fraction of PVP and the mass ratio in the light-adjusting solution to achieve the best effect.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The present application uses PVP as a dispersant, which has excellent dispersing ability and stability, can reduce the resistance experienced by the light-adjusting particles during rotational motion in the light-adjusting solution, and allows the light-adjusting particles to freely flip under the action of an electric field, so that the liquid light valve prepared by the present application can be driven at low voltage, greatly saving the energy consumption of the light-adjusting device during use, and having the advantages of fast response speed and short recovery time.

[0026] 2. The preparation method of the liquid light valve disclosed by the present application uniformly disperses the light-adjusting particles in the organic ester solvent, and fully mixes the organic ester solvent containing PVP and light-adjusting particles with the suspension to obtain a light-adjusting solution suitable for SPD. This measure reduces the viscosity of the light-adjusting solution and prevents the light-adjusting particles from agglomerating and depositing, and further improves the dispersibility of the light-adjusting particles, so that the SPD device can withstand repeated use while maintaining low performance degradation and good repeatability.

[0027] 3. The present application uses PVP as a dispersant, which has good solubility, can be dissolved in water and various polar organic solvents, is stable at room temperature and normal pressure, has low toxicity and good safety, causes less pollution during production, and meets the concept of green environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A working schematic diagram of a low-voltage driven liquid light valve prepared by the present application;

[0030] Figure 2 A transmittance schematic diagram of a liquid light valve prepared by the present application embodiment 1;

[0031] Figure 3 A transmittance schematic diagram of a liquid light valve prepared by the present application embodiment 2;

[0032] Figure 4 A transmittance schematic diagram of a liquid light valve prepared by the present application embodiment 3;

[0033] Figure 5 A transmittance schematic diagram of a liquid light valve prepared by the present application embodiment 4;

[0034] Figure 6 A transmittance schematic diagram of a liquid light valve prepared by the present application embodiment 5;

[0035] Figure 7 A transmittance schematic diagram of a liquid light valve prepared by the present application comparative example 1;

[0036] Figure 8 A transmittance schematic diagram of a liquid light valve prepared by the present application comparative example 2. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described in detail below with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0038] Embodiment 1

[0039] A low-voltage driven liquid light valve is prepared by the following steps:

[0040] (1) Preparation of light-adjusting particles:

[0041] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0042] (2) Preparation of suspension:

[0043] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylenetetramine were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 91 cps.

[0044] (3) Dissolve 0.1g of PVP with a molecular weight of 8000 in 10g of isoamyl acetate to obtain an organic ester solution of PVP.

[0045] (4) Add 2g of the light-adjusting particles obtained in step (1) to the organic ester solution of PVP obtained in step (3), disperse by ultrasonication to obtain a mixture; take 1g of the mixture and stir it with 5g of the suspension obtained in step (2) to obtain a light-adjusting liquid.

[0046] (5) Fill the dimming liquid obtained in step (4) between two layers of ITO glass to obtain a liquid light valve.

[0047] like Figure 1 The diagram shows the working principle of a low-voltage driven liquid light valve prepared according to the present invention. When no power is applied, the dimming particles inside the liquid light valve are irregularly scattered, and the liquid light valve has a light-transmitting but not transparent appearance. When the liquid light valve is powered on, the dimming particles inside are neatly arranged, and light can pass through freely. At this time, the liquid light valve instantly becomes transparent.

[0048] like Figure 2 As shown in Table 1, the liquid light valve obtained in Example 1 has a transmittance of about 40% in the visible light range when no voltage is applied. When a voltage of 25V is applied, the state changes to a transparent state, and its transmittance increases to about 90%. Its response time is 50ms and its recovery time is 0.4s.

[0049] Example 2

[0050] A low-voltage driven liquid light valve differs from Example 1 mainly in that it uses PVP of different molecular weights. Its preparation steps are as follows:

[0051] (1) Preparation of dimming particles:

[0052] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0053] (2) Preparation of suspension:

[0054] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylenetetramine were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 104 cps.

[0055] (3) Dissolve 0.1g of PVP with a molecular weight of 58000 in 10g of isoamyl acetate to obtain an organic ester solution of PVP.

[0056] (4) Add 2g of the light-adjusting particles obtained in step (1) to the organic ester solution of PVP obtained in step (3), disperse by ultrasonication to obtain a mixture; take 1g of the mixture and stir it with 5g of the suspension obtained in step (2) to obtain a light-adjusting liquid.

[0057] (5) Fill the dimming liquid obtained in step (4) between two layers of ITO glass to obtain a liquid light valve.

[0058] like Figure 3 As shown in Table 1, the liquid light valve obtained in Example 2 has a transmittance of about 40% in the visible light range when no voltage is applied. When a voltage of 25V is applied, the state changes to a transparent state, and its transmittance increases to about 80%. Its response time is 90ms and its recovery time is 1.2s.

[0059] Example 3

[0060] A low-voltage driven liquid light valve differs from Example 1 mainly in that it uses PVP of different molecular weights. Its preparation steps are as follows:

[0061] (1) Preparation of dimming particles:

[0062] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0063] (2) Preparation of suspension:

[0064] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylenetetramine were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 97 cps.

[0065] (3) Dissolve 0.1g of PVP with a molecular weight of 220000 in 10g of isoamyl acetate to obtain an organic ester solution of PVP.

[0066] (4) Add 2g of the light-adjusting particles obtained in step (1) to the organic ester solution of PVP obtained in step (3), disperse by ultrasonication to obtain a mixture; take 1g of the mixture and stir it with 5g of the suspension obtained in step (2) to obtain a light-adjusting liquid.

[0067] (5) Fill the dimming liquid obtained in step (4) between two layers of ITO glass to obtain a liquid light valve.

[0068] like Figure 4 As shown in Table 1, the liquid light valve obtained in Example 3 has a transmittance of about 40% in the visible light range when no voltage is applied. When a voltage of 40V is applied, the state changes to a transparent state, and its transmittance increases to about 70%. Its response time is 120ms and its recovery time is 2.6s.

[0069] Example 4

[0070] A low-voltage driven liquid light valve differs from Example 1 mainly in that it uses a PVP organic ester solution with different mass fractions. Its preparation steps are as follows:

[0071] (1) Preparation of dimming particles:

[0072] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0073] (2) Preparation of suspension:

[0074] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylene mercaptan were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 88 cps.

[0075] (3) Dissolve 0.01g of PVP with a molecular weight of 8000 in 10g of isoamyl acetate to obtain an organic ester solution of PVP.

[0076] (4) Add 2g of the light-adjusting particles obtained in step (1) to the organic ester solution of PVP obtained in step (3), disperse by ultrasonication to obtain a mixture; take 1g of the mixture and stir it with 5g of the suspension obtained in step (2) to obtain a light-adjusting liquid.

[0077] (5) Fill the dimming liquid obtained in step (4) between two layers of ITO glass to obtain a liquid light valve.

[0078] like Figure 5 As shown in Table 1, the liquid light valve obtained in Example 4 has a transmittance of about 30% in the visible light range when no voltage is applied. When a voltage of 25V is applied, the state changes to a transparent state, and its transmittance increases to about 60%. Its response time is 70ms and its recovery time is 3.5s.

[0079] Example 5

[0080] A low-voltage driven liquid light valve differs from Example 1 mainly in that it uses a PVP organic ester solution with different mass fractions. Its preparation steps are as follows:

[0081] (1) Preparation of dimming particles:

[0082] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0083] (2) Preparation of suspension:

[0084] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylenetetramine were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 102 cps.

[0085] (3) Dissolve 1g of PVP with a molecular weight of 8000 in 10g of isoamyl acetate to obtain an organic ester solution of PVP.

[0086] (4) Add 2g of the light-adjusting particles obtained in step (1) to the organic ester solution of PVP obtained in step (3), disperse by ultrasonication to obtain a mixture; take 1g of the mixture and stir it with 5g of the suspension obtained in step (2) to obtain a light-adjusting liquid.

[0087] (5) Fill the dimming liquid obtained in step (4) between two layers of ITO glass to obtain a liquid light valve.

[0088] like Figure 6 As shown in Table 1, the liquid light valve obtained in Example 4 has a transmittance of about 40% in the visible light range when no voltage is applied. When a voltage of 40V is applied, the state changes to a transparent state, and its transmittance increases to about 80%. Its response time is 150ms and its recovery time is 3.3s.

[0089] Comparative Example 1

[0090] A liquid light valve, differing from Example 1 in that it does not use a dispersant, and its preparation steps are as follows:

[0091] (1) Preparation of dimming particles:

[0092] Under ice bath conditions, 5g of quinine sulfate was dissolved in a mixture of 400mL water, 3mL concentrated sulfuric acid, and 30mL glacial acetic acid. Then, 5g of FeCl3 was added to obtain a light yellow solution A. Similarly, under ice bath conditions, 2.5g of I2 and 1g of KI were dissolved in a mixture of 20g of ethanol and 20g of water to obtain a dark brown solution B. Under ultrasonic treatment, solutions A and B were mixed uniformly with stirring while maintaining the temperature of the reaction system below 5℃. After reacting for 1 hour, the mixture was centrifuged and dried to obtain the light-adjusting particles.

[0093] (2) Preparation of suspension:

[0094] 0.9 mmol lauryl methacrylate and 0.1 mmol hydroxyethyl methacrylate were mixed evenly in a three-necked flask. Then, 100 mL toluene and 4 mL hexamethylenetetramine were added, and nitrogen gas was introduced into the well-mixed liquid. The reaction system was heated to 60 °C, and 0.3 g azobisisobutyl cyanide was added. The reaction was maintained at this temperature for 24 h. Finally, the mixture was rotary evaporated at 100 °C to obtain a suspension with a viscosity of 95 cps.

[0095] (3) Disperse 0.1g of light-adjusting particles directly into 5g of the suspension obtained in step (2) to obtain a light-adjusting solution;

[0096] (4) The obtained dimming liquid is filled between two layers of ITO glass to obtain a liquid light valve.

[0097] like Figure 7 As shown in Table 1, the liquid light valve obtained in Comparative Example 1 has a transmittance of about 40% in the visible light range when no voltage is applied. When the device changes to a transparent state, that is, when the transmittance rises to about 90%, a voltage of about 70V needs to be applied, and its response time is 60ms. Since the particles agglomerate after the power is turned off, its recovery time is more than 120s, and appropriate ultrasonic vibration is required for the device to fully recover to its initial state.

[0098] Comparative Example 2

[0099] A liquid light valve, differing from Example 1 in that it uses PVP with a larger molecular weight as a dispersant, and its preparation steps are as follows:

[0100] (1) Preparation of dimming particles:

[0101] In an ice bath environment, 5 g of quinine sulfate was dissolved in a mixture of 400 mL of water, 3 mL of concentrated sulfuric acid and 30 mL of ice acetic acid, then 5 g of FeCl3 was added to obtain a light yellow solution A; similarly, 2.5 g of I2 and 1 g of KI were dissolved in a mixture of 20 g of alcohol and 20 g of water to obtain a dark brown solution B; under ultrasonic action, solutions A and B were uniformly mixed and reacted while stirring, and the temperature of the reaction system was maintained at no more than 5°C, and after reaction for 1 h, centrifugation and drying were performed to obtain light-adjusting particles;

[0102] (2) Preparation of a suspension:

[0103] 0.9 mmol of lauryl methacrylate and 0.1 mmol of hydroxyethyl methacrylate were uniformly mixed in a three-necked flask, then 100 mL of toluene and 4 mL of hexanethiol were added, and nitrogen was introduced into the uniformly mixed liquid; after the reaction system was heated to 60°C, 0.3 g of azobisisobutyronitrile was added, and the temperature was maintained at 60°C for 24 h, and finally, 100°C rotary evaporation was performed to obtain a suspension with a viscosity of 99 cps;

[0104] (3) 0.01 g of PVP with a molecular weight of 1300000 was dissolved in 10 g of isopentyl acetate to obtain a PVP organic ester solution;

[0105] (4) 2 g of the light-adjusting particles obtained in step (1) were added to the PVP organic ester solution obtained in step (3) to obtain a mixture liquid by ultrasonic dispersion; 1 g of the mixture liquid was mixed with 5 g of the suspension obtained in step (2) by stirring to obtain a light-adjusting liquid;

[0106] (5) The light-adjusting liquid obtained in step (4) was filled between two layers of ITO glass to obtain a liquid light valve.

[0107] As Figure 8 shown in Table 1, the liquid light valve obtained in Comparative Example 2 had a transmittance of about 35% in the visible light range when no voltage was applied, and the state changed to a transparent state when a voltage of 110 V was applied, and the transmittance increased to about 70%, and the response time was 260 ms, which was difficult to return to the original state.

[0108] Table 1 Comparison of the properties of the liquid light valves prepared in each example and the comparative example

[0109] The above further describes the present application by means of specific examples, but it should be understood that the specific description herein should not be understood as limiting the essence and scope of the present application, and various modifications of the above examples made by those skilled in the art after reading the present specification are within the scope of the present application.

Claims

1. A low voltage driven liquid light valve, characterized in that, The liquid light valve comprises a first transparent electrode, a light-adjusting liquid and a second transparent electrode arranged in sequence. The light-adjusting liquid comprises light-adjusting particles, a suspension, a dispersing agent and an organic solvent. The dispersing agent is PVP. The driving voltage of the liquid light valve is 25-40V; the light-adjusting particles are iodine quinine sulfate nanorods; the molecular weight of the PVP is between 8000 and 220000.

2. A low voltage driven liquid light valve according to claim 1, characterized in that, The suspension is an acrylate polymer, and the viscosity is 30-200cps.

3. A low voltage driven liquid light valve according to claim 1, characterized in that, The organic solvent is selected from one or more of ethyl acetate, butyl acetate, isoamyl acetate, glyceryl triacetate and trioxin.

4. A low voltage driven liquid light valve according to claim 1, characterized in that, The first transparent electrode and the second transparent electrode are selected from one or more of ITO conductive glass, ITO conductive film, nano-silver wire conductive film, nano-copper wire conductive film, PEDOT conductive film, graphene conductive film and carbon nanotube conductive film.

5. A method of manufacturing a low-voltage driven liquid light valve according to any one of claims 1 to 4, characterized in that, The preparation steps are as follows: (1) preparing light-adjusting particles; (2) preparing a suspension; (3) dissolving PVP in an organic solvent to obtain a PVP organic ester solution; (4) mixing the light-adjusting particles obtained in step (1) with the PVP organic ester solution obtained in step (3) to obtain a mixed liquid, and then mixing the obtained mixed liquid with the suspension obtained in step (2) to obtain a light-adjusting liquid; (5) filling the light-adjusting liquid obtained in step (4) between the first transparent electrode and the second transparent electrode, and packaging to obtain the liquid light valve.

6. A method of manufacturing a low voltage driven liquid light valve according to claim 5, characterized in that, The mass fraction of PVP in the PVP organic ester solution in step (3) is 0.1-10%.

7. A method of manufacturing a low voltage driven liquid light valve according to claim 5, wherein, The mass ratio of the light-adjusting particles, the PVP organic ester solution and the suspension in step (4) is x:y:100, wherein x is between 2 and 6, and y is between 10 and 50.

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