A method for preparing a large-size photochromic window glass

Abstract

The present application relates to the technical field of variable color glass, and particularly relates to a preparation method of large-size photochromic window glass, comprising the following steps: S1: respectively grinding 3 parts by weight of silver bromide, 7 parts by weight of silver chloride, 9 parts by weight of inorganic photochromic powder and 2 parts by weight of aluminum oxide into 8-micron particles through a superfine dry grinding machine; S2: adding the ground silver bromide, silver chloride, inorganic photochromic powder and aluminum oxide into a mixture of 150 parts by weight of QIS-5705 elastic sealant and chloroprene glue, and stirring to form a transparent water paste mixture A; S3: wet grinding the mixture A, and grinding the mixture A into 0.1-micron paste; the preparation method is simple, integrates the advantages of light modulation, ultraviolet protection, heat insulation and energy saving, high weather resistance, decoration and the like, is an important glass material for assisting the high-end green development of the building, automobile and the like industries, is in line with the new mode under the background of "double carbon", and has good market prospect.

Description

Technical Field

[0001] This invention relates to the field of photochromic glass technology, and more particularly to a method for preparing large-size photochromic window glass. Background Technology

[0002] Under normal conditions, glass is transparent. Photochromic glass, when exposed to ultraviolet or visible light, absorbs light in the visible light region, reducing its light transmittance or causing a color change. It automatically returns to its original transparent state after the light exposure stops. Photochromic glass is typically produced by introducing a photosensitizer into ordinary glass components. The photosensitizer is usually uniformly dispersed in the glass in a microcrystalline state. Under sunlight, it decomposes, reducing the glass's light transmittance. When the glass is in the dark, the photosensitizer recombines, restoring transparency. The coloring and fading of the glass are reversible and permanent.

[0003] Photochromic glass is characterized by its color and light transmittance automatically changing with the intensity of sunlight. High sunlight intensity results in a darker glass color and lower light transmittance; conversely, low sunlight intensity results in a lighter glass color and higher light transmittance. Using photochromic glass to decorate buildings can create soft, colorful interior lighting, as well as a vibrant, ever-changing architectural appearance that harmonizes with the building's lighting environment. It is commonly used for building doors, windows, and curtain walls.

[0004] For example, patent application number CN202011381905.X discloses photochromic glass and its preparation method. Although the photochromic glass has good weather resistance and color-changing response speed, it also has the following drawbacks: 1) A large number of organic compounds are used to prepare the photochromic glass, making the preparation process relatively complicated; 2) The photochromic glass does not comprehensively improve its various properties, such as light transmission regulation performance, ultraviolet blocking performance, heat insulation and energy saving performance, and weather resistance stability. Therefore, there is an urgent need for a preparation method that is simple to prepare and can comprehensively and significantly improve the various properties of the photochromic glass. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for preparing large-size photochromic window glass, which solves the problems existing in the prior art. The method for preparing photochromic glass in the present invention is not only simple, but also greatly improves the light transmission adjustment performance, ultraviolet blocking performance, heat insulation and energy saving performance, and weather resistance of the photochromic glass prepared by this method.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: S1: 3 parts by weight of silver bromide, 7 parts by weight of silver chloride, 9 parts by weight of inorganic photochromic powder, and 2 parts by weight of alumina are ground into 8-micron particles using an ultrafine dry grinding mill; S2: The ground silver bromide, silver chloride, inorganic photochromic powder, and alumina are added to a mixture of 150 parts by weight of QIS-5705 elastic sealant and neoprene adhesive, and heated and stirred to form a transparent water-based paste mixture A; S3: Mixture A is wet-ground to form a paste with a particle size of 0.1 microns; S4: The paste after wet grinding in S3 is automatically filtered to remove particles smaller than or equal to 0.1 microns, thus obtaining a spray liquid B composed of particles smaller than or equal to 0.1 microns and a paste C composed of particles larger than 0.1 microns; S5: The paste C is subjected to the wet grinding step in step S3 again until a qualified spray liquid B is obtained.

[0009] S6: Use a liquid transfer pump to deliver qualified spraying liquid B to the spraying liquid storage area; S7: Heat the glass to be sprayed, then use a liquid spraying machine suction tube to draw in spraying liquid B from the spraying liquid B storage area for spraying operation. After drying, it can be assembled; S8: Seal the assembled glass with glue, and after acceptance, the finished product is put into the warehouse.

[0010] Preferably, the mass ratio of QIS-5705 elastic sealant to neoprene adhesive in step S2 is 4:11.

[0011] Preferably, the fully automatic filter in step S4 can be a multi-bag filter.

[0012] Preferably, the inorganic photochromic powder is composed of molybdenum trioxide, vanadium pentoxide and tungsten trioxide, wherein the mass ratio of molybdenum trioxide, vanadium pentoxide and tungsten trioxide is 5:3:1.

[0013] Preferably, the stirring in step S2 needs to be carried out in a dust-free environment with constant temperature and humidity, wherein the temperature is maintained at 40℃-50℃ and the humidity is maintained at 50%-60%.

[0014] Preferably, the temperature of wet grinding in step S3 is 28℃-32℃.

[0015] Preferably, the temperature at which the spraying liquid B is stored is 30℃-40℃.

[0016] Preferably, the glass in step S7 is heated to 55°C-60°C.

[0017] Preferably, in step S7, the thickness of the spraying liquid B on the glass surface is 0.05mm-0.08mm.

[0018] (III) Beneficial Effects

[0019] 1. This invention determines the composition of inorganic photochromic powder to be molybdenum trioxide, vanadium pentoxide and tungsten trioxide, and sets the ratio of the three to be 5:3:1. This composition and ratio can make the effect and performance of photochromic powder optimal, and greatly improve the dimming, UV protection, heat insulation and energy saving and high weather resistance of the glass finally prepared.

[0020] 2. This invention uses wet grinding to fully mix silver bromide, silver chloride, inorganic photochromic powder, alumina, QIS-5705 elastic sealant, and neoprene adhesive after dry grinding. Simultaneously, the mixture is ground into a nano-sized water-based paste. The combination of dry and wet grinding results in a final spray liquid B that forms a paste. When sprayed onto glass, this paste creates an atomization effect. Because the glass is heated before spraying, the water in the atomized coating evaporates immediately, allowing the coating to dry quickly and firmly. After evaporating a large amount of water, the coating thickness reaches 0.05-0.08 mm, essentially maintaining the original glass transparency.

[0021] 3. This invention uses QIS-5705 elastic sealant, which greatly enhances the bonding strength between the two pieces of glass. The total content of QIS-5705 elastic sealant and neoprene adhesive in mixture A can reach more than 85%. The main function of adding neoprene adhesive is to dilute it, mainly to increase the moisture content in the adhesive so that the discoloring substance becomes a paste, ensuring the requirements of spraying and making the sprayed shape a mist.

[0022] 4. This invention has strong light transmittance adjustment performance. The light transmittance can be adjusted rapidly and significantly in different light environments (dark / bright). It provides a bright field of vision in dark light and prevents glare in bright light. It can also effectively reduce the use of sunshade components.

[0023] 5. This invention can block more than 99.9% of ultraviolet radiation, greatly reducing the damage of outdoor light to human eyes and skin, and effectively slowing down the aging rate of automobile and building interior components.

[0024] 6. This invention has an effective ability to block solar radiation. Attached Figure Description

[0025] Figure 1 This is the transmission spectrum of the invention from its initial state to 15 minutes after restoration of vision;

[0026] Figure 2 This is a transmission-time curve of the color-changing and luminous restoration process of the present invention;

[0027] Figure 3 This is a simulation diagram of the lighting effect of the present invention;

[0028] Figure 4The following are the ultraviolet-visible spectra of different glasses of this invention;

[0029] Figure 5 This is the transmission spectrum from the initial state of the present invention to 10 minutes of irradiation;

[0030] Figure 6 This is the quality inspection report for the present invention;

[0031] Figure 7 The radiation shielding performance of the xenon lamp of this invention under different irradiance intensities;

[0032] Figure 8 This is a radiation transmittance comparison chart of the same thickness of this product, ordinary glass, and LowE glass under a xenon lamp.

[0033] Figure 9 This is a real-time data graph of the solar shading performance of the present invention in an actual outdoor scenario within 1 minute;

[0034] Figure 10 This is a weather resistance test report for this product certified by the China Testing and Inspection Center (CTC). Detailed Implementation

[0035] The following will refer to the appendices in the embodiments of the present invention. Figure 1-10 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] S1: Grind 30g of silver bromide, 70g of silver chloride, 90g of inorganic photochromic powder (including 50g of molybdenum trioxide, 30g of vanadium pentoxide, and 10g of tungsten trioxide), and 20g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to a mixture of 150g of QIS-5705 elastic sealant and chloroprene adhesive (including 40g of QIS-5705 elastic sealant and 110g of chloroprene adhesive), and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Wet grind mixture A at a temperature of 28℃-32℃ to form a paste with a diameter of 0.1 micrometers; S4: Wet grind the mixture from S3... The paste after grinding is automatically filtered to remove particles smaller than or equal to 0.1 micrometers, resulting in a spray coating liquid B composed of particles smaller than or equal to 0.1 micrometers and a paste C composed of particles larger than 0.1 micrometers. S5: The paste C is subjected to the wet grinding step in step S3 again until a qualified spray coating liquid B is obtained. S6: The qualified spray coating liquid B is transported to the spray coating liquid storage area using a liquid transfer pump, where the temperature of the spray coating liquid B is 30℃-40℃. S7: The glass to be sprayed is heated to 55℃-60℃, and then the spray coating liquid B is drawn into the storage area using a liquid spraying machine suction tube for spraying. The thickness of the spray coating liquid B on the glass surface is 0.05mm. After drying, it can be assembled. S8: The assembled glass is sealed with adhesive, and after acceptance, the finished product is put into storage.

[0038] Example 2

[0039] S1: Grind 60g of silver bromide, 140g of silver chloride, 180g of inorganic photochromic powder (including 100g of molybdenum trioxide, 60g of vanadium pentoxide, and 20g of tungsten trioxide), and 40g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to a mixture of 300g of QIS-5705 elastic sealant and chloroprene adhesive (including 80g of QIS-5705 elastic sealant and 220g of chloroprene adhesive), and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Perform wet grinding on mixture A at a temperature of 28℃-32℃ to grind mixture A into a paste with a diameter of 0.1 micrometers; S4: Add the mixture from S3... The wet-milled paste is automatically filtered to remove particles smaller than or equal to 0.1 micrometers, resulting in a spray coating liquid B composed of particles smaller than or equal to 0.1 micrometers and a paste C composed of particles larger than 0.1 micrometers. S5: The paste C is subjected to the wet-milling step in step S3 again until a qualified spray coating liquid B is obtained. S6: The qualified spray coating liquid B is transported to the spray coating liquid storage area using a liquid transfer pump, where the storage temperature of spray coating liquid B is 30℃-40℃. S7: The glass to be sprayed is heated to 55℃-60℃, and then the spray coating liquid B is drawn into the storage area using a liquid spraying machine suction tube for spraying. The thickness of spray coating liquid B on the glass surface is 0.06mm. After drying, it is ready for assembly. S8: The assembled glass is sealed with adhesive, and after passing inspection, the finished product is put into storage.

[0040] Example 3

[0041] S1: Grind 120g of silver bromide, 280g of silver chloride, 360g of inorganic photochromic powder (including 200g of molybdenum trioxide, 120g of vanadium pentoxide, and 40g of tungsten trioxide) and 80g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to a mixture of 600g of QIS-5705 elastic sealant and chloroprene adhesive (including 160g of QIS-5705 elastic sealant and 440g of chloroprene adhesive), and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Perform wet grinding on mixture A at a temperature of 28℃-32℃ to grind mixture A into a paste with a diameter of 0.1 micrometers; S4: ... S3. The paste after wet grinding is automatically filtered to remove particles smaller than or equal to 0.1 micrometers, thus obtaining spray liquid B composed of particles smaller than or equal to 0.1 micrometers and paste C composed of particles larger than 0.1 micrometers; S5. Paste C is subjected to the wet grinding step in step S3 again until qualified spray liquid B is obtained; S6. Qualified spray liquid B is transported to the spray liquid storage area using a liquid transfer pump, where the temperature of spray liquid B is 30℃-40℃; S7. The glass to be sprayed is heated to 55℃-60℃, and then the spray liquid B is drawn into the spray liquid B storage area using a liquid spraying machine suction tube for spraying. The thickness of spray liquid B on the glass surface is 0.07mm. After drying, it can be assembled; S8. The assembled glass is sealed with glue, and after acceptance, the finished product is put into storage.

[0042] Example 4

[0043] S1: Grind 220g of silver bromide, 560g of silver chloride, 720g of inorganic photochromic powder (including 400g of molybdenum trioxide, 240g of vanadium pentoxide, and 80g of tungsten trioxide) and 160g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to a mixture of 1200g of QIS-5705 elastic sealant and chloroprene adhesive (including 320g of QIS-5705 elastic sealant and 880g of chloroprene adhesive), and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Perform wet grinding on mixture A at a temperature of 28℃-32℃ to grind mixture A into a paste with a diameter of 0.1 micrometers; S4: ... S3: The paste after wet grinding is automatically filtered to remove particles smaller than or equal to 0.1 micrometers, resulting in spray liquid B composed of particles smaller than or equal to 0.1 micrometers and paste C composed of particles larger than 0.1 micrometers. S5: Paste C is subjected to the wet grinding step in S3 again until qualified spray liquid B is obtained. S6: Qualified spray liquid B is transported to the spray liquid storage area using a liquid transfer pump, where the temperature of spray liquid B is 30℃-40℃. S7: The glass to be sprayed is heated to 55℃-60℃, and then the spray liquid B is drawn into the spray liquid B storage area using a liquid spraying machine suction tube for spraying. The thickness of spray liquid B on the glass surface is 0.08mm. After drying, it can be assembled. S8: The assembled glass is sealed with glue, and after acceptance, the finished product is put into storage.

[0044] Comparative Example 1

[0045] S1: Grind 20g of silver bromide, 30g of silver chloride, 70g of inorganic photochromic powder (including 10g of titanium dioxide, 25g of vanadium pentoxide, and 35g of tungsten trioxide), and 30g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to 300g of neoprene adhesive and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Perform wet grinding on mixture A at a temperature of 28℃-32℃ to grind mixture A into a paste with a diameter of 0.1 micrometers; S4: Perform fully automatic filtration on the paste after wet grinding in S3 to filter out particles with a diameter of less than or equal to 0.1 micrometers. The process involves: S5: Re-processing the wet grinding step in step S3 on the paste C, using 1-micron particles to obtain a spray liquid B composed of particles with a diameter of 0.1 microns or less, and a paste C composed of particles with a diameter greater than 0.1 microns; S6: Using a liquid transfer pump, transport the qualified spray liquid B to the spray liquid storage area, where the temperature of the spray liquid B is 30℃-40℃; S7: Heating the glass to be sprayed to 55℃-60℃, then using a liquid spraying machine suction tube inserted into the spray liquid B storage area to draw in the spray liquid B for spraying. The thickness of the spray liquid B on the glass surface is 0.05mm. After drying, it can be assembled; S8: Sealing the assembled glass, and after acceptance, the finished product is put into storage.

[0046] Comparative Example 2

[0047] S1: Grind 50g of silver bromide, 70g of silver chloride, 90g of inorganic photochromic powder (including 45g of molybdenum trioxide, 10g of titanium dioxide, and 35g of tungsten trioxide), and 50g of alumina into particles with a diameter of 8 micrometers using an ultrafine dry grinder; S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder, and alumina to 700g of neoprene adhesive and stir in a dust-free environment at a temperature of 40℃-50℃ and a humidity of 50%-60% to form a transparent water-based paste mixture A; S3: Perform wet grinding on mixture A at a temperature of 28℃-32℃ to grind mixture A into a paste with a diameter of 0.1 micrometers; S4: Perform fully automatic filtration on the wet-ground paste from S3 to filter out particles with a diameter of less than or equal to 0.1 micrometers. The process involves: S5: Re-processing the wet grinding step in step S3 on the paste C, using 1-micron particles to obtain a spray liquid B composed of particles with a diameter of 0.1 microns or less, and a paste C composed of particles with a diameter greater than 0.1 microns; S6: Using a liquid transfer pump, transport the qualified spray liquid B to the spray liquid storage area, where the temperature of the spray liquid B is 30℃-40℃; S7: Heating the glass to be sprayed to 55℃-60℃, then using a liquid spraying machine suction tube inserted into the spray liquid B storage area to draw in the spray liquid B for spraying. The thickness of the spray liquid B on the glass surface is 0.06mm. After drying, it can be assembled; S8: Sealing the assembled glass, and after acceptance, the finished product is put into storage.

[0048] I. The implementation effects of this product's various performance aspects:

[0049] 1. Test of light transmittance adjustment performance:

[0050] (1) The transmission spectrum from the initial state to 15 minutes after restoration of visibility was tested in this invention, as shown in the attached figures of the specification. Figure 1 ,in Figure 1 The five curves in the image, from top to bottom, represent the initial state, irradiation for 5 minutes, restoration of vision for 5 minutes, restoration of vision for 10 minutes, and restoration of vision for 15 minutes.

[0051] (2) The present invention tested the transmission time curves of the color change and restoration process, as shown in the attached figures of the specification. Figure 2 ,in Figure 2 The two curves, from top to bottom, represent irradiation for 5 minutes and irradiation for 10 minutes, and the data table for this color-changing and vision-restoring transmittance is as follows:

[0052] (3) Simulated lighting parameters:

[0053] Building: Window-to-wall ratio 1 / 4, interior clear width 11.2m, clear height 2.6m, clear depth 7.2m; Light intensity: Uniform ambient light, luminance 5000cd / m2 and 15000cd / m2 respectively;

[0054] Wall: 400mm thick, non-transparent, wall surface: 10% A (absorption) + 90% R (reflection); Glass: refractive index 1.5, transmittance 10% ~ 90%.

[0055]

[0056] According to the "Standard for Daylighting Design of Buildings" GB 50033-2013 3.0.1~3.0.3:

[0057] 1) Daylight factor standard % = Indoor natural light standard value / Outdoor design illuminance;

[0058] 2) The standard stipulates that the outdoor design illuminance is 15,000 lx and the outdoor critical illuminance is 5,000 lx;

[0059] 3) The upper limit of the daylighting standard should not be higher than the range of the previous daylighting level, and the daylight factor should not be higher than 7%;

[0060] 4) Therefore, the indoor lighting intensity should not exceed 15000x7%=1050lx.

[0061] Outdoor design illuminance: If this illuminance is met, the workplace can be fully illuminated by natural light.

[0062] Outdoor critical illuminance: If the illuminance is below this level, all indoor lighting will be required.

[0063] See details Figure 3 The specific parameter comparison is shown in the table below:

[0064]

[0065] Based on the above (1)-(3), the following conclusions can be drawn: 1) The transmittance can be adjusted rapidly and significantly in different light environments (dark / bright); it provides a bright field of vision in dark light and prevents glare in bright light; 2) The indoor light environment is often too bright under natural light, and the use of light-colored glass with adjustable transmittance can effectively reduce the use of shading components.

[0066] 2. Testing of UV blocking performance:

[0067] This invention tested the ultraviolet-visible spectra of different glasses; the test results are shown in the accompanying drawings of the specification. Figure 4 ,in Figure 4 The four curves in the image, with the right end of each curve as a reference, represent, from top to bottom, this product, ordinary glass, high transmittance (LowE), and low transmittance (LowE). The transmittance data for the calculated ultraviolet band are shown in the table below:

[0068]

[0069] Transmittance of different ultraviolet bands: UVA (315-400 nm): 0.2%; UVB (280-315 nm): 0.1%; UVC (200-289 nm): 4.5%.

[0070] In summary, this product can block more than 99.9% of ultraviolet radiation (300~380 nm), greatly reducing the damage of outdoor light to human eyes and skin, and effectively slowing down the aging rate of automotive and building interior components.

[0071] 3. Testing of thermal insulation and energy-saving performance:

[0072] (1) The present invention tested the transmission spectrum from the initial state to 10 minutes of irradiation, as shown in the attached figures of the specification. Figure 5 ,in Figure 5 The three curves in the image, with the left end of each curve as a reference, represent the initial state, 5 minutes of irradiation, and 10 minutes of irradiation from top to bottom. The values ​​are based on... Figure 5 The calculated solar transmittance is as follows:

[0073]

[0074] (2) A test report was prepared for the photochromic glass, as detailed in the attached diagram of the instruction manual. Figure 6 Where SHGC (Solar Heat Gain Coefficient) = SG (Shading Coefficient) x 0.87 = 0.58; SHGC-High Transmission LowE: 0.67 SHGC-Low Transmission LowE: 0.38, the solar heat gain coefficient of this product is lower than that of high transmission LowE glass (75.7%).

[0075] (3) The present invention tested the radiation shielding performance of the xenon lamp under different irradiance intensities, as detailed in the attached figures of the specification. Figure 7 ,in Figure 7 The four curves in the image, from top to bottom, represent 3# 800 W / ㎡, 3# 1000 W / ㎡, 3# 1100 W / ㎡, and 3# 1200 W / ㎡, respectively. Figure 7 It is known that after saturation, it can block 55% to 60% of radiation;

[0076] (4) The present invention tested the radiation transmittance of the same thickness product, ordinary glass, and LowE glass under a xenon lamp. For details, please refer to the appendix of the instruction manual. Figure 8 ;

[0077] (5) This invention tested the solar shading performance in a real outdoor scenario for 1 minute. Real-time data graphs are attached to the instruction manual. Figure 9 ,in Figure 9The two curves in the diagram, from top to bottom, represent the area in front of the glass (direct sunlight) and the area behind the glass (through the viewing window). The outdoor sunlight in front of the glass (direct sunlight) is approximately 1010 W / m². The initial value of the left end of the curve behind the glass (through the viewing window) is 790 W / m², and the value at the right end after one minute is 637 W / m², which can block about 40% of the solar radiation after one minute.

[0078] Based on the above (1)-(5), the following conclusion is drawn: This product has an effective ability to block solar radiation.

[0079] 4. Weather resistance stability test:

[0080] This invention was carried out in accordance with the standard GB 15763.3-2009 Safety Glass for Buildings Part 3: Laminated Glass, and third-party testing was conducted. The test report, instruction manual, and accompanying drawings are included. Figure 10 According to third-party testing, the heat resistance, moisture resistance, and radiation resistance of this product all meet the national standards for laminated glass.

[0081] II. Comparison data between this product and the comparative example:

[0082] 1. Comparison of light transmission adjustment performance:

[0083] Color-changing and vision-restoring transmittance data table (where the data in the table are transmittance).

[0084] Therefore, it can be seen that the light transmittance adjustment performance of the color-changing glass prepared by the specific components, proportions and processes of the present invention is optimal. This product can adjust the light transmittance rapidly and significantly, while the adjustment speed of Comparative Example 1 and Comparative Example 2 is relatively slow and the adjustment range is relatively small.

[0085] 2. Comparison of UV blocking performance:

[0086] Transmittance data for the ultraviolet calculated band (the data in the table are the transmittance of ultraviolet light).

[0087] Therefore, it can be seen that only the color-changing glass prepared with the specific components, proportions and processes of this invention has the best UV blocking performance. This product can block more than 99.9% of UV radiation, while Comparative Example 1 and Comparative Example 2 can block significantly less UV radiation than this product.

[0088] 3. Comparison of thermal insulation and energy-saving performance:

[0089] Solar heat gain coefficient data table

[0090] Therefore, it can be seen that only the color-changing glass prepared with the specific components, proportions and processes of this invention has the best heat insulation and energy-saving performance. This product has an effective heat insulation effect, while the heat insulation effect of Comparative Example 1 and Comparative Example 2 is significantly worse than that of this product.

[0091] 4. Comparison of weather resistance performance:

[0092] Comparison table of heat resistance, moisture resistance, and radiation resistance

[0093] Therefore, it can be seen that the weather resistance of the color-changing glass prepared by the specific components, proportions and processes of this invention is optimal. The heat resistance, moisture resistance and radiation resistance of this product meet the national standards for laminated glass, while the heat resistance, moisture resistance and radiation resistance of Comparative Example 1 and Comparative Example 2 do not fully meet the national standards for laminated glass.

[0094] It should be noted that the above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A method for preparing a large-size photochromic window glass, characterized in that, Includes the following steps: S1: 30 parts by weight of silver bromide, 70 parts by weight of silver chloride, 90 parts by weight of inorganic photochromic powder and 20 parts by weight of alumina are ground into 8-micron particles by an ultrafine dry grinding mill. The inorganic photochromic powder is composed of molybdenum trioxide, vanadium pentoxide and tungsten trioxide, wherein the mass ratio of molybdenum trioxide, vanadium pentoxide and tungsten trioxide is 5:3:

1. S2: Add the ground silver bromide, silver chloride, inorganic photochromic powder and alumina to a mixture of 150 parts by weight of QIS-5705 elastic sealant and neoprene adhesive, and heat and stir to form a transparent water-paste mixture A. S3: Wet grinding of mixture A to form a paste of 0.1 micrometers; S4: The paste after wet grinding in S3 is filtered by fully automatic filtration to filter out particles with a diameter of less than or equal to 0.1 micrometers, thus obtaining a spray liquid B composed of particles with a diameter of less than or equal to 0.1 micrometers and a paste C composed of particles with a diameter of greater than 0.1 micrometers; S5: Repeat the wet grinding step in step S3 with paste C until qualified spray liquid B is obtained; S6: Use a liquid transfer pump to deliver the qualified spraying liquid B to the spraying liquid storage area; S7: Heat the glass to be sprayed, then use the suction tube of the liquid spraying machine to draw in the spraying liquid B storage area and perform the spraying operation. After it dries, assemble it. S8: Seal the assembled glass with glue, and put the finished product into the warehouse after acceptance.

2. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, In step S2, the mass ratio of QIS-5705 elastic sealant to neoprene adhesive is 4:

11.

3. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, The fully automatic filter in step S4 uses a multi-bag filter.

4. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, In step S2, stirring must be carried out in a dust-free environment with constant temperature and humidity, wherein the temperature is maintained at 40℃-50℃ and the humidity is maintained at 50%-60%.

5. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, The temperature for wet grinding in step S3 is 28℃-32℃.

6. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, The temperature for storing spraying liquid B in step S6 is 30℃-40℃.

7. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, In step S7, the glass is heated to 55℃-60℃.

8. The method for preparing a large-size photochromic window glass according to claim 1, characterized in that, In step S7, the thickness of the spraying liquid B on the glass surface is 0.05mm-0.08mm.

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