Intelligent dynamic dimming laminated glass and preparation method thereof

Abstract

The present application discloses a laminated glass with intelligent dynamic dimming and a preparation method thereof, relating to the field of dimming glass. The laminated glass with intelligent dynamic dimming comprises two glass substrates and an inorganic rod-shaped nanoparticle dimming film, wherein the two glass substrates are respectively connected to the two sides of the inorganic rod-shaped nanoparticle dimming film, and a PVB film is provided between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates, and the two sides of the PVB film are respectively connected to the side walls of the dimming film and the side walls of the glass; the inorganic rod-shaped nanoparticles comprise the following components: 0.592-0.6 parts of tungsten chloride, 68.9-88.9 parts of polyol, 0.120-0.132 parts of cesium hydroxide, and 5-10 parts of acetic acid; the dimming film of the present application can withstand the influence of high temperature of lamination and can be used in laminated glass to achieve intelligent dynamic dimming. The prepared laminated glass with intelligent dynamic dimming can effectively block infrared light transmittance without affecting visible light transmittance.

Description

Technical Field

[0001] The present application relates to the field of dimming glass, and in particular to a kind of intelligent dynamic dimming laminated glass and a preparation method thereof. Background Art

[0002] Laminated glass is a composite glass product made of two or more pieces of glass with one or more layers of organic polymer interlayer sandwiched between them. After undergoing a special high-temperature pre-pressing and high-temperature, high-pressure process, the glass and interlayer are permanently bonded together. Switchable glass is glass that changes color under certain conditions, such as light, current, external pressure, temperature, and magnetic fields. The color changes with each change, and reversibly returns to its original state when the external conditions disappear. Switchable film is often used for this purpose.

[0003] For related technology, please refer to Chinese invention patent application publication number CN113105351A, which discloses electrically polarized particles, their preparation method, and their application in electrically polarized color-shifting optical films. These electrically polarized particles are rod-shaped metal complexes formed through a chemical reaction between metal iodides, nitrogen-containing organic carboxylic acid molecules, elemental iodine, and a cellulose suspending agent. The electrically polarized color-shifting optical film produced using these electrically polarized particles exhibits advantages such as a wide transmittance color change range, low haze, and a fast response speed when driven by voltage.

[0004] Regarding the above-mentioned related technologies, the inventors believe that there are the following defects: According to national standards, all current building curtain wall laminated glass should be laminated with PVB film. Since the temperature required for laminating PVB film is as high as 130°C or above, and the color-changing optical film used in the above-mentioned materials cannot withstand the high temperature of 130°C, the structure of the dimming film is destroyed and it cannot be used for laminated glass. Summary of the Invention

[0005] In order to provide an intelligent dynamic dimming film that can withstand high temperatures and can be used for laminated glass, the present application provides an intelligent dynamic dimming laminated glass and a preparation method thereof.

[0006] This application provides an intelligent dynamic dimming laminated glass, which adopts the following technical solutions:

[0007] A smart dynamic dimming laminated glass and its preparation method, comprising two glass substrates and an inorganic rod-shaped nanoparticle dimming film, wherein the two glass substrates are respectively connected to both sides of the inorganic rod-shaped nanoparticle dimming film; the inorganic rod-shaped nanoparticles comprise the following components: 0.592-0.6 parts of tungsten chloride, 68.9-88.9 parts of polyol, 0.120-0.132 parts of cesium hydroxide and 5-10 parts of

[0008] Acetic acid.

[0009] By adopting the above technical solution, inorganic rod-shaped nanoparticles cesium-doped tungsten oxide are used because cesium-doped tungsten oxide nanopowders have more excellent and stable near-infrared light absorption capabilities than tungsten oxide nanopowders. Tungsten oxide nanopowders have a relatively high melting point of approximately 1470-1475°C. The use of tungsten oxide to prepare a dimming film can improve the high-temperature resistance of the dimming film. When PVB film is used for lamination, the film can withstand the lamination temperature without affecting the dimming performance. At the same time, tungsten oxide has a strong infrared light absorption capability. After cesium doping, the stability of tungsten oxide is improved, which can significantly reduce the infrared light transmittance while ensuring intelligent dynamic dimming of laminated glass without affecting the visible light transmittance.

[0010] Preferably, the polyol is one of ethanol and ethylene glycol.

[0011] By adopting the above technical solution and using ethanol or ethylene glycol as a solvent, the yield and purity of the prepared inorganic rod-shaped nanoparticles can be improved, thereby reducing the infrared light transmittance of the laminated glass.

[0012] Preferably, the inorganic rod-shaped nanoparticle dimming film comprises the following components: 3-5 parts of inorganic rod-shaped nanoparticles, 1.5-2.0 parts of nitrocellulose, 45-54 parts of butyl acetate, 297-366 parts of oligomers, 90-120 parts of UV cross-linked copolymers, 9-12 parts of UV curing initiators, and 450-600 parts of solvents.

[0013] By adopting the above technical solution, inorganic rod-shaped nanoparticles are used to make a dimming film, which is used in laminated glass to improve the infrared shielding property of the glass, reduce the infrared light transmittance, and achieve a heat insulation effect.

[0014] Preferably, the oligomer is poly (2-ethylhexyl methacrylate).

[0015] By adopting the above technical solution, poly(2-ethylhexyl methacrylate) is used to prepare a dimming film, which can improve the plasticity of the dimming film. Nitrogen is introduced into isooctyl methacrylate and ethyl acetate to remove air, and then an ethyl acetate solution of 1-octanethiol and azobisisobutyronitrile is added to react. After extraction, washing, rotary evaporation, and reduced pressure distillation to remove low-boiling point fractions, poly(2-ethylhexyl methacrylate) is obtained.

[0016] Preferably, the UV cross-linked copolymer is a polyacrylate-polystyrene copolymer.

[0017] By adopting the above technical solution, a polyacrylate-polystyrene copolymer is used as the ultraviolet cross-linking copolymer, and after being doped with a photoinitiator, it can be quickly cross-linked to form a film under ultraviolet light, and the high temperature resistance of the film can be improved; styrene, 3-methacryloxypropylmethyldiethoxysilane and ethyl acetate are mixed, nitrogen is introduced to exclude air, and then an ethyl acetate solution of azobisisobutyronitrile is slowly added dropwise to react; and after extraction, washing, rotary evaporation and reduced pressure distillation to remove low-boiling point fractions, the polyacrylate-polystyrene copolymer is obtained.

[0018] Preferably, the UV curing initiator is 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

[0019] By adopting the above technical solution, 2,4,6-trimethylbenzoyldiphenylphosphine oxide is used as a photocuring initiator because its absorption peak is longer than that of conventional initiators. After exposure to light, it can generate two free radicals, benzoyl and phosphoryl, both of which can initiate polymerization. Therefore, it can promote the rapid film formation of the UV-crosslinked copolymer under UV light. At the same time, it also has a photobleaching effect and can prevent the film layer from yellowing.

[0020] This application also provides a method for preparing intelligent dynamic dimming laminated glass, which adopts the following technical solution:

[0021] A method for preparing intelligent dynamic dimming laminated glass comprises the following steps:

[0022] Two glass substrates are respectively connected to the two sides of the inorganic rod-shaped nanoparticle dimming film. A PVB film is placed between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates. The two sides of the PVB film are respectively connected to the side walls of the dimming film and the side walls of the glass. The lamination temperature is controlled at 130-140°C to obtain intelligent dynamic dimming laminated glass.

[0023] By adopting the above technical solution, the dimming film prepared by using inorganic rod-shaped nanoparticles improves the temperature tolerance of the dimming film and is more conducive to the preparation of laminated glass with high infrared shielding properties.

[0024] Preferably, the method for preparing the inorganic rod-shaped nanoparticle dimming film comprises the following steps:

[0025] S1. 3-5 parts of inorganic rod-shaped nanoparticles were dispersed in 1.5-2.0 parts of nitrocellulose and 45-54 parts of butyl acetate, and the dispersed particle solution was blended with 297-366 parts of poly (2-ethylhexyl methacrylate), and the solvent was dried to obtain a mixed emulsion A of inorganic rod-shaped nanoparticles and oligomers;

[0026] S2. To 90-120 parts of polyacrylate - polystyrene were added 9-12 parts of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 450-600 parts of a solvent, mixed and dissolved, and the organic solvent was removed by spinning to obtain liquid B; emulsion A and liquid B were blended in a mass ratio of 1: (5-6), mixed thoroughly and vacuum degassed to obtain a coating slurry;

[0027] S3. The coating slurry is applied and laminated between two ITO films using a roll-to-roll coating method. The thickness is adjusted by controlling the distance between the two rollers, and an inorganic rod-shaped nanoparticle dimming film is obtained after UV curing.

[0028] By adopting the above technical solution and the roll-to-roll coating method, the thickness of the dimming film can be controlled; at the same time, under ultraviolet light, the dimming film can be quickly cross-linked to form a film.

[0029] Preferably, the method for preparing the inorganic rod-shaped nanoparticles comprises the following steps:

[0030] 0.592-0.6 parts of tungsten chloride, 68.9-88.9 parts of polyol, 0.120-0.132 parts of cesium hydroxide and 5-10 parts of acetic acid are added to the polytetrafluoroethylene liner of a hydrothermal reactor; the hydrothermal reactor is placed in an oven for reaction; the supernatant liquid of the reaction solution is removed by centrifugation to obtain inorganic rod-shaped nanoparticles.

[0031] By adopting the above technical solution, cesium-doped tungsten oxide nanoparticles are prepared by hydrothermal reaction, which is more conducive to controlling the reaction conditions and has a simple preparation process.

[0032] Preferably, the conditions of the hydrothermal reaction are: reaction temperature of 170-200° C., and reaction time of 12-36 h.

[0033] By adopting the above technical solution and controlling the temperature and reaction time of the hydrothermal reaction, the yield and purity of cesium-doped tungsten oxide nanoparticles are improved, thereby facilitating the reduction of the infrared light transmittance of laminated glass.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By adopting the above technical solution, inorganic rod-shaped nanoparticles cesium-doped tungsten oxide are used because cesium-doped tungsten oxide nanopowders have better and more stable near-infrared light absorption ability than tungsten oxide nanopowders. Tungsten oxide nanopowders have a higher melting point of about 1470-1475°C. Using tungsten oxide to prepare the dimming film can improve the high temperature resistance of the dimming film, and when using PVB film for lamination, it can withstand the lamination temperature;

[0036] 2. By adopting the above technical solution, the dimming film made of cesium-doped tungsten oxide nanoparticles is used in laminated glass to improve the infrared shielding properties of the glass, reduce the infrared light transmittance, and achieve a heat insulation effect;

[0037] 3. By adopting the above technical solution, the ultraviolet cross-linked copolymer is polyacrylate-polystyrene copolymer. After being doped with a photoinitiator, it can be quickly cross-linked to form a film under ultraviolet light, and the high temperature resistance of the film can be improved. DETAILED DESCRIPTION

[0038] The present application is further described in detail below with reference to the embodiments.

[0039] Preparation Example

[0040] Preparation Example 1

[0041] Preparation method of poly (2-ethylhexyl methacrylate):

[0042] 19.8 g of isooctyl methacrylate and 100 mL of ethyl acetate were added to a 250 mL three-necked flask, nitrogen was introduced for 15 min, 2.6 mL of 1-octanethiol was added, the temperature was rapidly raised to 65°C, and a 246 mg / 30 mL solution of azobisisobutyronitrile in ethyl acetate was slowly added and reacted for 10 h. After extraction and washing, the product was rotary evaporated at 100°C and distilled under reduced pressure to obtain poly(isooctyl methacrylate).

[0043] Preparation Example 2

[0044] Preparation method of polyacrylate-polystyrene copolymer:

[0045] 156 g of styrene, 130 g of 3-methacryloyloxypropylmethyldiethoxysilane, and 400 mL of ethyl acetate were added to a 2 L three-necked flask, nitrogen was introduced for 15 min, the temperature was rapidly raised to 80°C, and then a 3.28 g / 50 mL solution of azobisisobutyronitrile in ethyl acetate was slowly added dropwise and reacted for 8 h. After extraction and washing, the mixture was rotary evaporated at 110°C and distilled off under reduced pressure to obtain a polyacrylate-polystyrene copolymer.

[0046] Example

[0047] Example 1

[0048] S1. 0.592 g of tungsten chloride, 68.9 g of polyol, 0.120 g of cesium hydroxide, and 5 g of acetic acid were added to the polytetrafluoroethylene liner of a hydrothermal reactor. The polyol used in this example was ethanol. The hydrothermal reactor was placed in an oven at 170°C for 12 h. The resulting solution was centrifuged at 8000 rpm and the supernatant was removed to obtain blue-black inorganic rod-shaped nanoparticles at the bottom.

[0049] S2. 3 g of inorganic rod-shaped nanoparticles were ultrasonically dispersed in 1.5 g of nitrocellulose and 45 g of butyl acetate, and the dispersed particle solution was blended with 297 g of poly (2-ethylhexyl methacrylate) obtained in Preparation Example 1, and ultrasonically mixed at 80 kHz, and the solvent was dried to obtain a mixed emulsion A of inorganic rod-shaped nanoparticles and oligomers;

[0050] S3. To 90g of the polymer polyacrylate obtained in Preparation Example 2 - polystyrene was added 9g of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 450g of solvent, and after uniform dissolution by ultrasound at 80kHz, the mixture was placed in a rotary evaporator and spun off the organic solvent to obtain Liquid B. The solvent used in this Example was tetrahydrofuran; Emulsion A and Liquid B were blended in a mass ratio of 1:5, stirred thoroughly and subjected to vacuum degassing to obtain a coating slurry;

[0051] S4. The coating slurry was applied and laminated between two ITO films using a roll-to-roll coating method. The thickness was adjusted by controlling the spacing between the two rollers and cured under a UV curing lamp for 90 seconds to obtain an inorganic rod-shaped nanoparticle dimming film with a thickness of 98 μm.

[0052] S5. Two glass substrates are respectively connected to the two sides of the inorganic rod-shaped nanoparticle dimming film, and a PVB film is provided between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates. The two sides of the PVB film are respectively connected to the side wall of the dimming film and the side wall of the glass. After heating at 130°C, intelligent dynamic dimming laminated glass is obtained.

[0053] Example 2

[0054] S1. 0.592 g of tungsten chloride, 68.9 g of polyol, 0.120 g of cesium hydroxide, and 5 g of acetic acid were added to the polytetrafluoroethylene liner of a hydrothermal reactor. The polyol used in this example was ethanol. The hydrothermal reactor was placed in an oven at 170°C for 12 h. The resulting solution was centrifuged at 8500 rpm and the supernatant was removed to obtain blue-black inorganic rod-shaped nanoparticles at the bottom.

[0055] S2. 4 g of inorganic rod-shaped nanoparticles were ultrasonically dispersed in 1.7 g of nitrocellulose and 49 g of butyl acetate, and the dispersed particle solution was blended with 332 g of poly (2-ethylhexyl methacrylate) obtained in Preparation Example 1, and ultrasonically mixed at 85 kHz, and the solvent was dried to obtain a mixed emulsion A of inorganic rod-shaped nanoparticles and oligomers;

[0056] S3. To 90g of the polymer polyacrylate obtained in Preparation Example 2 - polystyrene was added 9g of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 525g of solvent, and uniformly dissolved under ultrasound at 85kHz, and placed in a rotary evaporator to spin off the organic solvent to obtain Liquid B. The solvent used in this Example is tetrahydrofuran; Emulsion A and Liquid B were blended in a mass ratio of 1: 5.5, stirred thoroughly and vacuum degassed to obtain a coating slurry;

[0057] S4. The coating slurry was applied by a roll-to-roll coating method and laminated between two ITO films. The thickness was adjusted by controlling the distance between the two rollers and cured under a UV curing lamp for 100 seconds to obtain an inorganic rod-shaped nanoparticle dimming film with a thickness of 100 μm.

[0058] S5. Two glass substrates are respectively connected to the two sides of the inorganic rod-shaped nanoparticle dimming film, and a PVB film is provided between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates. The two sides of the PVB film are respectively connected to the side wall of the dimming film and the side wall of the glass. After heating at 135°C, intelligent dynamic dimming laminated glass is obtained.

[0059] Example 3

[0060] S1. Add 0.592g of tungsten chloride, 68.9g of polyol, 0.120g of cesium hydroxide, and 5g of acetic acid to the polytetrafluoroethylene liner of a hydrothermal reactor. In this example, the polyol used is ethanol. Place the hydrothermal reactor in a 170°C oven and allow the reaction to proceed for 12 hours. Centrifuge the resulting solution at 9000 rpm and remove the supernatant to obtain blue-black inorganic rod-shaped nanoparticles.

[0061] S2. 5g of inorganic rod-shaped nanoparticles were ultrasonically dispersed in 2.0g of nitrocellulose and 54g of butyl acetate, and the dispersed particle solution was blended with 297g of poly (2-ethylhexyl methacrylate) obtained in Preparation Example 1, and ultrasonically mixed at 90kHz, and the solvent was dried to obtain a mixed emulsion A of inorganic rod-shaped nanoparticles and oligomers;

[0062] S3. To 90g of the polymer polyacrylate obtained in Preparation Example 2 - polystyrene was added 9g of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 600g of solvent, and after uniform dissolution by ultrasound at 90kHz, the mixture was placed in a rotary evaporator and the organic solvent was removed by spin to obtain liquid B. The solvent used in this embodiment was tetrahydrofuran; emulsion A and liquid B were blended in a mass ratio of 1:6, stirred thoroughly and subjected to vacuum degassing to obtain a coating slurry;

[0063] S4. The coating slurry was applied and laminated between two ITO films using a roll-to-roll coating method. The thickness was adjusted by controlling the spacing between the two rollers and cured under a UV curing lamp for 110 seconds to obtain an inorganic rod-shaped nanoparticle dimming film with a thickness of 103 μm.

[0064] S5. Connect two glass substrates to both sides of the inorganic rod-shaped nanoparticle dimming film, and place a PVB film between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates. The two sides of the PVB film are connected to the side wall of the dimming film and the side wall of the glass at 140 ° C.

[0065] After heating under the condition of high temperature, intelligent dynamic dimming laminated glass is obtained.

[0066] Examples 4-15

[0067] The difference between Example 4-15 and Example 1 is that the process parameters used in S1 for preparing inorganic rod-shaped nanoparticles in Example 4-15 are different, as shown in Table 1:

[0068] Table 1 Process parameters used in preparing inorganic rod-shaped nanoparticles

[0069]

[0070]

[0071] Examples 16-21

[0072] The difference between Examples 16-21 and Example 1 is that the process parameters used in S2-S3 to prepare the inorganic rod-shaped nanoparticle dimming film are different, as shown in Table 2:

[0073] Table 2 Process parameters used in S1 to prepare inorganic rod-shaped nanoparticles

[0074]

[0075] Example 22

[0076] The difference between Example 26 and Example 1 is that the polyol used in S1 of Example 26 is ethylene glycol.

[0077] Comparative Example

[0078] Comparative Examples 1-12

[0079] Comparative Examples 1-12 differ from Example 1 in that the process parameters for preparing inorganic rod-shaped nanoparticles in S1 are different, as shown in Table 3:

[0080] Table 3 Process parameters used in S1 to prepare inorganic rod-shaped nanoparticles

[0081]

[0082]

[0083] Comparative Examples 13-18

[0084] Comparative Examples 13-18 differ from Example 1 in that the process parameters for preparing the inorganic rod-shaped nanoparticle dimming film in S2-S3 are different, as shown in Table 4:

[0085] Table 4S1 Process parameters used to prepare inorganic rod-shaped nanoparticles

[0086]

[0087] Comparative Example 19

[0088] The difference between Comparative Example 23 and Example 1 is that the polyol used in S1 of Comparative Example 23 is isopropyl alcohol.

[0089] Comparative Example 20

[0090] The difference between Comparative Example 24 and Example 1 is that the polyol used in S1 of Comparative Example 24 is butanol.

[0091] Performance testing

[0092] 1. A TH-100 haze meter (Hangzhou Caipu Technology Co., Ltd.) was used to test the visible light transmittance (%) of the intelligent dynamic dimming films prepared in Examples 1-22 and Comparative Examples 1-20 in both the powered-on and powered-off states before lamination, as well as the visible light transmittance (%) of the laminated glass in both the powered-on and powered-off states. The test range was 400 nm to 700 nm, and the inorganic rod-shaped nanoparticle dimming films were driven by an AC power supply with a frequency of 50 Hz and an adjustable voltage range of 0-220 V. The test results are shown in Table 5.

[0093] 2. An LH-221 light transmittance tester (Shenzhen Lianhuicheng Technology Co., Ltd.) was used to test the infrared transmittance (%) of the intelligent dynamic dimming films prepared in Examples 1-22 and Comparative Examples 1-20 in both the powered-on and powered-off states before lamination, as well as the infrared transmittance (%) of the laminated glass in both the powered-on and powered-off states. The test range was 960 nm to 1000 nm, and the inorganic rod-shaped nanoparticle dimming films were driven by an AC power supply with a frequency of 50 Hz and an adjustable voltage range of 0-220 V. The test results are shown in Table 6.

[0094] Table 5 Test results of visible light transmittance (%) of intelligent dynamic dimming laminated glass

[0095]

[0096]

[0097] Table 6 Test results of infrared light transmittance (%) of laminated glass with intelligent dynamic dimming

[0098]

[0099]

[0100]

[0101] The test results in Table 5 show that the intelligent dynamic dimming film provided in the present application has improved the high temperature tolerance of the dimming film and can be used in laminated glass. In addition, the visible light transmittance before and after lamination is basically unchanged in the non-powered state, while in the power-on state, the visible light transmittance after lamination is slightly lower than that before lamination.

[0102] The test results in Table 6 show that the intelligent dynamic dimming film provided in the present application improves the infrared shielding property of the dimming film and can be used in laminated glass. In addition, the infrared light transmittance before and after lamination remains basically unchanged in the non-powered state, while in the powered state, the infrared light transmittance after lamination increases slightly compared to before lamination.

[0103] It can be seen from the test results of Examples 1-3 that the process parameters for preparing intelligent dynamic dimming laminated glass provided in this application improve the high temperature resistance of the dimming film and are conducive to improving the infrared shielding property of the intelligent dynamic dimming laminated glass.

[0104] From the performance test results of Examples 1, 4, 5 and Comparative Examples 1-2, it can be seen that when the tungsten chloride content used in the preparation of inorganic rod-shaped nanoparticles increases, the infrared light transmittance gradually decreases and the visible light transmittance also decreases slightly. When the tungsten chloride content exceeds 0.6 g, the infrared light transmittance begins to increase again.

[0105] From the performance test results of Examples 1, 6, 7 and Comparative Examples 3-4, it can be seen that when the ethanol content used to prepare inorganic rod-shaped nanoparticles increases, the infrared light transmittance gradually decreases and the visible light transmittance also decreases slightly. When the ethanol content exceeds 88.9 g, the visible light transmittance and infrared light transmittance no longer change.

[0106] From the performance test results of Examples 1, 8, 9 and Comparative Examples 5-6, it can be seen that when the cesium hydroxide content used to prepare the inorganic rod-shaped nanoparticles increases, the infrared light transmittance gradually decreases, and the visible light transmittance also gradually decreases. However, when the cesium hydroxide content exceeds 0.132 g, the infrared light transmittance begins to increase again, and the visible light transmittance still decreases slightly.

[0107] The performance test results of Examples 1, 10, and 11 and Comparative Examples 7-8 show that when the acetic acid content used to prepare the inorganic rod-shaped nanoparticles is 0, the infrared light transmittance of the resulting intelligent dynamically dimming laminated glass is relatively high, approximately 39%. When acetic acid is added, the infrared light transmittance decreases, and the visible light transmittance also decreases. However, as the acetic acid content increases, the infrared light transmittance gradually increases, while the visible light transmittance continues to gradually decrease. When the acetic acid content exceeds 10g, the visible light transmittance begins to increase again.

[0108] The performance test results of Examples 1, 12, and 13 and Comparative Examples 9-10 show that when the reaction temperature used to prepare the inorganic rod-shaped nanoparticles increases, the infrared light transmittance of the resulting intelligent dynamic dimming laminated glass first decreases. When the temperature exceeds 180°C, the infrared light transmittance increases again. Similarly, the visible light transmittance also decreases as the reaction temperature increases, and then begins to increase again when the reaction temperature exceeds 180°C.

[0109] The performance test results of Examples 1, 14, and 15 and Comparative Examples 11-12 show that as the reaction time for preparing inorganic rod-shaped nanoparticles increases, the infrared light transmittance of the resulting intelligent dynamic dimming laminated glass gradually decreases, and the visible light transmittance also decreases slightly. When the reaction time exceeds 36 hours, the infrared light transmittance no longer changes.

[0110] The performance test results of Examples 1, 16, and 17 and Comparative Examples 13-14 show that when the content of poly(2-ethylhexyl methacrylate) used to prepare the inorganic rod-shaped nanoparticle dimming film increases, the infrared light transmittance of the resulting intelligent dynamic dimming laminated glass first decreases slightly. When the content of poly(2-ethylhexyl methacrylate) exceeds 332g, the infrared light transmittance begins to increase; the visible light transmittance also increases slightly.

[0111] The performance test results of Examples 1, 18, and 19 and Comparative Examples 15-16 show that as the content of polyacrylate-polystyrene in preparing the inorganic rod-shaped nanoparticle dimming film increases, the infrared light transmittance of the resulting intelligent dynamic dimming laminated glass first decreases. When the polyacrylate-polystyrene content exceeds 105g, the infrared light transmittance begins to increase; the visible light transmittance fluctuates slightly.

[0112] It can be seen from the performance test results of Examples 1, 20, 21 and Comparative Examples 17-18 that when the content of 2,4,6-trimethylbenzoyldiphenylphosphine oxide in the preparation of the inorganic rod-shaped nanoparticle dimming film increases, the infrared light transmittance gradually decreases. When the content of 2,4,6-trimethylbenzoyldiphenylphosphine oxide exceeds 10.5 g, the infrared light transmittance no longer changes; while the visible light transmittance gradually decreases with the increase of the content of 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

[0113] The performance test results of Examples 1 and 22 and Comparative Examples 19-20 show that the polyols ethanol and ethylene glycol used in the preparation of inorganic rod-shaped nanoparticles provided in this application are both beneficial to improving the infrared shielding properties of the intelligent dynamic dimming laminated glass. However, when isopropyl alcohol and butanol are used, the infrared light transmittance of the obtained intelligent dynamic dimming laminated glass is greater.

[0114] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An intelligent dynamic dimming laminated glass, characterized by: It includes two glass substrates and an inorganic rod-shaped nanoparticle dimming film, wherein the two glass substrates are respectively connected to two sides of the inorganic rod-shaped nanoparticle dimming film; The inorganic rod-shaped nanoparticle dimming film comprises the following components: 3-5 parts of inorganic rod-shaped nanoparticles, 1.5-2.0 parts of nitrocellulose, 45-54 parts of butyl acetate, 297-366 parts of oligomers, 90-120 parts of UV cross-linked copolymers, 9-12 parts of UV curing initiators, and 450-600 parts of solvents; The inorganic rod-shaped nanoparticles include the following components: 0.592-0.6 parts of tungsten chloride, 68.9-88.9 parts of polyol, 0.120-0.132 parts of cesium hydroxide and 5-10 parts of acetic acid; wherein the polyol is one of ethanol and ethylene glycol; The oligomer is poly (2-ethylhexyl methacrylate); The ultraviolet cross-linked copolymer is a polyacrylate-polystyrene copolymer; The ultraviolet curing initiator is 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

2. A method for preparing intelligent dynamic dimming laminated glass according to claim 1, characterized in that: The following steps are involved: Two glass substrates are respectively connected to the two sides of the inorganic rod-shaped nanoparticle dimming film. A PVB film is placed between the inorganic rod-shaped nanoparticle dimming film and the two glass substrates. The two sides of the PVB film are respectively connected to the side walls of the dimming film and the side walls of the glass. The lamination temperature is controlled at 130-140°C to obtain intelligent dynamic dimming laminated glass.

3. The preparation method according to claim 2, wherein: The preparation method of the inorganic rod-shaped nanoparticle dimming film comprises the following steps: S1. 3-5 parts of inorganic rod-shaped nanoparticles were dispersed in 1.5-2.0 parts of nitrocellulose and 45-54 parts of butyl acetate, and the dispersed particle solution was blended with 297-366 parts of poly (2-ethylhexyl methacrylate), and the solvent was dried to obtain a mixed emulsion A of inorganic rod-shaped nanoparticles and oligomers; S2. Add 9-12 parts of 2,4,6-trimethylbenzoyldiphenylphosphine oxide and 450-600 parts of solvent to 90-120 parts of polyacrylate-polystyrene, mix and dissolve, and then remove the organic solvent to obtain liquid B; blend emulsion A and liquid B in a mass ratio of 1: (5-6), mix thoroughly and degas under vacuum to obtain a coating slurry; S3. The coating slurry is applied and laminated between two ITO films using a roll-to-roll coating method. The thickness is adjusted by controlling the distance between the two rollers, and an inorganic rod-shaped nanoparticle dimming film is obtained after UV curing.

4. The preparation method according to claim 2, wherein: The preparation method of the inorganic rod-shaped nanoparticles comprises the following steps: 0.592-0.6 parts of tungsten chloride, 68.9-88.9 parts of polyol, 0.120-0.132 parts of cesium hydroxide and 5-10 parts of acetic acid are added to the polytetrafluoroethylene liner of a hydrothermal reactor; the hydrothermal reactor is placed in an oven for reaction; the supernatant liquid of the reaction solution is removed by centrifugation to obtain inorganic rod-shaped nanoparticles.

5. The preparation method according to claim 4, characterized in that: The conditions of the hydrothermal reaction are: reaction temperature of 170-200° C., and reaction time of 12-36 h.

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