One-way perspective explosion-proof glass and preparation method thereof

Abstract

The application belongs to the technical field of glass, and provides one-way perspective explosion-proof glass and a preparation method thereof, the preparation method comprising the following steps: (1) cleaning a glass substrate to obtain a pretreated glass substrate; (2) uniformly applying a peep-proof component on one side of the pretreated glass substrate, and baking at a temperature of 240-260 DEG C for 10-15 min after the coating is completed, so that the peep-proof component is hardened into a peep-proof layer; (3) uniformly applying an explosion-proof component on the surface of the peep-proof layer, and baking at a temperature of 190-200 DEG C for 10-15 min, so that the explosion-proof component is hardened into an explosion-proof film, to obtain a glass crude product; (4) placing the glass crude product in a medium-frequency furnace, heating the medium-frequency furnace to 450-470 DEG C, and heating for 10-15 min, so that the glass crude product is hardened and shaped; cooling and cleaning to obtain the one-way perspective explosion-proof glass. The glass has the advantages of peep-proofness, explosion-proofness, strong compression resistance and strong bending resistance.

Description

Technical Field

[0001] This invention belongs to the field of glass technology, specifically relating to a one-way vision explosion-proof glass and its preparation method. Background Technology

[0002] Glass is widely used due to its excellent light transmission, sound insulation, relatively light weight, and ease of installation. However, as a typical brittle material, glass, despite its high strength, is also easily broken. Especially when subjected to strong explosive pressure or violent impact, it can shatter rapidly, producing high-speed fragments that can not only cause injury to people but also pose safety risks to surrounding structures and facilities. Therefore, improving the resistance of glass to impacts and explosions is crucial to protecting people and property from damage.

[0003] In the design of glass curtain walls for high-rise buildings, glass needs to have good flexural strength, compressive strength, flame retardancy and expansion resistance. The glass curtain walls of these buildings not only need to withstand the effects of external forces such as wind loads and earthquakes, but also need to provide an effective fire barrier in the event of a fire and maintain structural integrity under drastic temperature changes. The following problems exist with the glass currently on the market: (1) The glass curtain walls of high-rise buildings need to withstand the effects of wind loads and other external forces. If the flexural strength is insufficient, the glass may break, which will not only affect the aesthetics, but may also cause safety hazards. (2) Although the compressive strength of glass is relatively high, in actual applications, due to its brittleness and uneven stress distribution, local areas may not be able to withstand large pressure and will break. (3) In the event of a fire, the glass curtain wall or partition needs to have sufficient fire resistance to prevent the spread of flames and smoke and protect the safety of people. (4) The coefficient of thermal expansion of glass is small, but when the temperature changes drastically, especially the rapid transition from low temperature to high temperature, large thermal stress will be generated inside the glass, leading to cracks or breakage.

[0004] To improve performance, current explosion-proof glass on the market has explosion-proof layers on both sides of the base glass, which not only increases costs but also reduces the glass's transparency.

[0005] Therefore, there is an urgent need for a one-way vision explosion-proof glass and its preparation method. Summary of the Invention

[0006] The purpose of this invention is to provide a one-way vision explosion-proof glass and its preparation method.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for preparing one-way vision explosion-proof glass includes the following steps:

[0009] (1) Clean the glass substrate to obtain a pretreated glass substrate:

[0010] (2) Apply the privacy protection component evenly to one side of the pretreated glass substrate. After coating, bake at 240-260℃ for 10-15 minutes to harden the privacy protection component into a privacy protection layer with a thickness of 8-12μm.

[0011] The privacy protection component comprises the following components in parts by weight: 100-110 parts modified mixed powder, 5-10 parts titanium dioxide, 32-35 parts polyvinyl acetal, 42-45 parts polyurethane acrylate, 12-15 parts zinc oxide, 15-17 parts tin oxide, 15-20 parts AZO, 5-10 parts ITO, and 10-12 parts film-forming agent.

[0012] (3) The explosion-proof component is uniformly coated on the surface of the privacy layer and baked at 190-200℃ for 10-15 minutes to harden the explosion-proof component into an explosion-proof film with a thickness of 1.5-1.7μm, thus obtaining the glass rough product;

[0013] (4) Place the rough glass in a medium frequency furnace, heat the medium frequency furnace to 450-470℃, heat for 10-15 minutes, harden and form; cool and clean to obtain one-way perspective explosion-proof glass.

[0014] Furthermore, the preparation method of the modified mixed powder includes the following steps:

[0015] (1) Mix the modified castor oil polyol and isocyanate-based propyltriethoxysilane and react at 40-45℃ for 2-3 hours to obtain the reaction product;

[0016] (2) The reaction product, the mixed powder and ethanol are mixed and reacted at 50-55℃ for 4-6 hours. The ethanol is removed by rotary evaporation under reduced pressure to obtain the modified mixed powder.

[0017] Furthermore, the amount of modified castor oil polyol is calculated in OH molar amounts, the amount of isocyanate-propyltriethoxysilane is calculated in NCO molar amounts, and the molar ratio of modified castor oil polyol to isocyanate-propyltriethoxysilane is (2.2-2.7):1.

[0018] Furthermore, the weight ratio of the reaction product, the mixed powder, and ethanol is 1:(90-95):(400-450).

[0019] Furthermore, the mixed powder comprises the following components in parts by weight: 38-43 parts acrylic powder, 50-55 parts SiO2, and 5-10 parts lanthanum oxide.

[0020] Currently available privacy films often incorporate silica to improve the compressive strength of glass, but this still falls short of the high compressive strength requirements for high-rise buildings. This invention attempts to improve glass compressive strength by simultaneously adding acrylic powder and lanthanum oxide, but the results are not ideal. By modifying the three materials with modified castor oil polyol and isocyanate-propyltriethoxysilane, the dispersibility of the three powders and their compatibility with other components can be improved, thereby enhancing the compressive strength of the glass. The reaction between modified castor oil polyol and isocyanate-propyltriethoxysilane introduces organic functional groups onto the powder surface. This surface modification significantly improves the compatibility between inorganic particles and the organic polymer matrix, reduces particle agglomeration, and thus improves its dispersibility in the final composite material. Through the above chemical reaction, an intermediate product with organic-inorganic hybrid characteristics is formed. These hybrid particles not only inherit the physical properties of the original inorganic powder (such as hardness and optical properties) but also acquire the flexibility and good processing performance from the organic component. Simultaneously, the flexural strength of the glass is improved.

[0021] Further, the explosion-proof component comprises the following components in parts by weight: 35-39 parts SiO2, 8-13 parts lanthanum oxide, 55-58 parts modified polyurethane, 20-25 parts acrylic resin, 6-8 parts pressure-sensitive adhesive, 5-10 parts titanium dioxide, 3-7 parts potassium dihydrogen phosphate, 6-9 parts cerium oxide, and 4-8 parts film-forming agent.

[0022] Furthermore, the preparation method of the modified polyurethane resin includes the following steps:

[0023] (1) Add polyetheramine dropwise to polyisocyanate and react at 45-50℃ for 1-2 hours. Then add polyether polyol and heat to 75-80℃ for 2-3 hours to obtain prepolymer.

[0024] (2) Add γ-aminopropyltriethoxysilane to the prepolymer and react at 45-50℃ for 2-3 hours to obtain modified polyurethane resin.

[0025] Further, the polyether polyol is a mixture of polyether polyol A (model HSH-204) with a hydroxyl value of 265~300 mgKOH / g, polyether polyol B (model 153~188) with a hydroxyl value of 153~188 mgKOH / g, and polyether polyol C (model HSH-215) with a hydroxyl value of 68~83 mgKOH / g, in a weight ratio of 1:(1.2-1.5):(0.5-0.8). It was purchased from Nantong Jiuzhe Chemical Co., Ltd.

[0026] To improve the adhesion of the explosion-proof layer to the privacy screen surface, this invention modifies the polyurethane by introducing specific functional groups, enhancing the adhesion between the polyurethane and the substrate (privacy screen). This helps ensure the explosion-proof layer adheres firmly to the privacy screen. Unexpectedly, it was also discovered that modifying the polyurethane improves the coefficient of thermal expansion of the glass. The reaction of polyisocyanates with polyetheramines forms a prepolymer containing urethane bonds. These bonds possess high rigidity and strong cohesive force, restricting the movement of molecular chain segments and thus reducing volume changes when heated. By introducing γ-aminopropyltriethoxysilane, the prepared modified polyurethane resin exhibits organic-inorganic hybrid characteristics. This structure not only improves the mechanical properties of the material but also enhances the interfacial compatibility between the organic and inorganic components. Better interfacial compatibility reduces stress concentration caused by differences in the coefficients of thermal expansion between different components, allowing the entire composite material to expand or contract more uniformly with temperature changes, thereby reducing the overall coefficient of thermal expansion. Simultaneously, the flame retardancy of the glass is improved.

[0027] Further, the polyisocyanate is at least one of diphenylmethane diisocyanate, methylcyclohexyl diisocyanate, and isophorone diisocyanate.

[0028] Furthermore, the molar ratio of NCO groups in the polyisocyanate to the total active hydrogen in the polyether polyol and polyether amine is (2-2.5):1.

[0029] Furthermore, the molar ratio of the NCO group in the prepolymer to the active hydrogen in γ-aminopropyltriethoxysilane is (0.7-0.9):1.

[0030] This invention provides a one-way transparent explosion-proof glass prepared by the aforementioned method.

[0031] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0032] 1. This invention attempts to improve the compressive strength of glass by simultaneously adding acrylic powder and lanthanum oxide, but the effect is not ideal. By modifying the three materials with modified castor oil polyol and isocyanate-based propyltriethoxysilane, the dispersibility of the three powders and their compatibility with other components can be improved, thereby improving the compressive strength of the glass. Simultaneously, the flexural strength of the glass is also improved.

[0033] 2. This invention modifies polyurethane by introducing specific functional groups, which enhances the adhesion between the polyurethane and the substrate (privacy film). This helps ensure that the explosion-proof layer adheres firmly to the privacy film. It was also unexpectedly discovered that modifying polyurethane can improve the coefficient of thermal expansion and flame retardancy of glass. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0035] All raw materials used in the following embodiments of the present invention are commercially available products:

[0036] Glass substrate, Zhengzhou Dongyao Glass Co., Ltd., 12mm tempered glass.

[0037] Titanium dioxide, Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., model ZT05.

[0038] Polyvinyl acetal, brand Sigma-Aldrich, item number 182680.

[0039] Polyurethane acrylate, Guangzhou Jingtu Environmental Protection Materials Co., Ltd., model P-6212.

[0040] Zinc oxide, Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., model ZT-AZO.

[0041] Tin oxide, Beijing Deco Island Gold Technology Co., Ltd., average particle size: 50nm, specific surface area: 14.2m². 2 / g.

[0042] AZO, Beijing Deco Island Gold Technology Co., Ltd., model DK444.

[0043] ITO, Beijing Deco Island Gold Technology Co., Ltd., In2O3:SnO2=90wt%:10wt%.

[0044] Film-forming agent: BASF LOXANOLCA5330.

[0045] Isocyanate-based propyltriethoxysilane, Cas:24801-88-5.

[0046] Acrylic powder, Daikin Japan, 1000 mesh.

[0047] SiO2, Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., model ZT-SP15P.

[0048] Lanthanum oxide, Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., model ZT-La01.

[0049] Acrylic resin, brand: McLean, item number: L990045.

[0050] Pressure-sensitive adhesive, Linqu Sanjun Plastic Products Co., Ltd., UV pressure-sensitive adhesive, peel strength 18N / 25mm.

[0051] Cerium oxide, Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., model ZT-Ce02. Example 1

[0052] This embodiment provides a one-way vision explosion-proof glass, the preparation method of which includes the following steps:

[0053] (1) Clean the glass substrate to obtain a pretreated glass substrate:

[0054] (2) Apply the privacy protection component evenly to one side of the pretreated glass substrate. After coating, bake at 250°C for 15 minutes to harden the privacy protection component into a privacy protection layer with a thickness of 10 μm.

[0055] (3) The explosion-proof component is uniformly coated on the surface of the privacy layer and baked at 195°C for 15 minutes to harden the explosion-proof component into an explosion-proof film with a thickness of 1.7 μm, thus obtaining the glass rough product.

[0056] (4) Place the rough glass in a medium frequency furnace, heat the medium frequency furnace to 460°C, heat for 15 minutes, harden and form; cool and clean to obtain one-way perspective explosion-proof glass.

[0057] The privacy protection component comprises the following components in parts by weight: 105 parts modified mixed powder, 8 parts titanium dioxide, 33 parts polyvinyl acetal, 44 parts polyurethane acrylate, 13 parts zinc oxide, 16 parts tin oxide, 17 parts AZO, 8 parts ITO, and 11 parts film-forming agent.

[0058] The method for preparing the modified mixed powder includes the following steps:

[0059] (1) Modified castor oil polyol and isocyanate-propyltriethoxysilane were mixed. The amount of modified castor oil polyol was calculated as the molar amount of OH, and the amount of isocyanate-propyltriethoxysilane was calculated as the molar amount of NCO. The molar ratio of modified castor oil polyol to isocyanate-propyltriethoxysilane was 2.5:1. The mixture was reacted at 42℃ for 2.5 h to obtain the reaction product.

[0060] (2) The reaction product, the mixed powder and ethanol are mixed in a weight ratio of 1:92:420. The mixed powder includes the following components in parts by weight: 40 parts acrylic powder, 52 parts SiO2 and 7 parts lanthanum oxide. The mixture is reacted at 52°C for 5 hours and the ethanol is removed by rotary evaporation under reduced pressure to obtain the modified mixed powder.

[0061] Modified castor oil polyol, purchased from Shanghai Shuyu Chemical Co., Ltd., model SY780, hydroxyl value 180.

[0062] The explosion-proof component comprises the following components in parts by weight: 37 parts SiO2, 10 parts lanthanum oxide, 56 parts modified polyurethane, 21 parts acrylic resin, 7 parts pressure-sensitive adhesive, 8 parts titanium dioxide, 6 parts potassium dihydrogen phosphate, 7 parts cerium oxide, and 6 parts film-forming agent.

[0063] The preparation method of the modified polyurethane resin includes the following steps:

[0064] (1) Add polyetheramine dropwise to polyisocyanate and react at 48°C for 1.5 h. Then add polyether polyol. The molar ratio of NCO groups in the polyisocyanate to the total active hydrogen in the polyether polyol and polyetheramine is 2.2:1. The weight ratio of polyether polyol to polyetheramine is 17:22. Heat to 78°C and react for 2.5 h to obtain prepolymer. The polyisocyanate is isophorone diisocyanate.

[0065] (2) Add γ-aminopropyltriethoxysilane to the prepolymer, wherein the molar ratio of NCO group in the prepolymer to active hydrogen in γ-aminopropyltriethoxysilane is 0.8:1; react at 48°C for 2.5 h to obtain modified polyurethane resin.

[0066] The polyether polyols are a mixture of polyether polyol A (model HSH-204) with a hydroxyl value of 265~300 mgKOH / g, polyether polyol B (model 153~188) with a hydroxyl value of 153~188 mgKOH / g, and polyether polyol C (model HSH-215) with a hydroxyl value of 68~83 mgKOH / g, in a weight ratio of 1:1.4:0.6. They were purchased from Nantong Jiuzhe Chemical Co., Ltd.

[0067] The polyetheramine has an EO / PO ratio of 6 / 29 and an HLB value of 2.8. Brand: McLean, item number P939193. Example 2

[0068] This embodiment provides a one-way vision explosion-proof glass, the preparation method of which includes the following steps:

[0069] (1) Clean the glass substrate to obtain a pretreated glass substrate:

[0070] (2) Apply the privacy protection component evenly to one side of the pretreated glass substrate. After coating, bake at 260°C for 10 minutes to harden the privacy protection component into a privacy protection layer with a thickness of 10 μm.

[0071] (3) The explosion-proof component is uniformly coated on the surface of the privacy layer and baked at 200℃ for 10 minutes to harden the explosion-proof component into an explosion-proof film with a thickness of 1.7μm, thus obtaining the glass rough product;

[0072] (4) Place the rough glass in a medium frequency furnace, heat the medium frequency furnace to 450°C, heat for 15 minutes, harden and form; cool and clean to obtain one-way perspective explosion-proof glass.

[0073] The privacy protection component comprises the following components in parts by weight: 110 parts modified mixed powder, 5 parts titanium dioxide, 35 parts polyvinyl acetal, 42 parts polyurethane acrylate, 15 parts zinc oxide, 15 parts tin oxide, 20 parts AZO, 5 parts ITO, and 12 parts film-forming agent.

[0074] The method for preparing the modified mixed powder includes the following steps:

[0075] (1) Modified castor oil polyol and isocyanate-propyltriethoxysilane were mixed. The amount of modified castor oil polyol was calculated as the molar amount of OH, and the amount of isocyanate-propyltriethoxysilane was calculated as the molar amount of NCO. The molar ratio of modified castor oil polyol to isocyanate-propyltriethoxysilane was 2.2:1. The mixture was reacted at 45°C for 3 hours to obtain the reaction product.

[0076] (2) The reaction product, the mixed powder and ethanol are mixed in a weight ratio of 1:90:400. The mixed powder includes the following components in parts by weight: 43 parts acrylic powder, 55 parts SiO2 and 5 parts lanthanum oxide. The mixture is reacted at 55°C for 6 hours and the ethanol is removed by rotary evaporation under reduced pressure to obtain the modified mixed powder.

[0077] Modified castor oil polyol, purchased from Shanghai Shuyu Chemical Co., Ltd., model SY780, hydroxyl value 180.

[0078] The explosion-proof component comprises the following components in parts by weight: 39 parts SiO2, 13 parts lanthanum oxide, 55 parts modified polyurethane, 25 parts acrylic resin, 8 parts pressure-sensitive adhesive, 10 parts titanium dioxide, 3 parts potassium dihydrogen phosphate, 9 parts cerium oxide, and 4 parts film-forming agent.

[0079] The preparation method of the modified polyurethane resin includes the following steps:

[0080] (1) Add polyetheramine dropwise to polyisocyanate, react at 50°C for 1 h, and then add polyether polyol. The molar ratio of NCO groups in the polyisocyanate to the total active hydrogen in the polyether polyol and polyetheramine is 2:1; the weight ratio of polyether polyol to polyetheramine is 18:23; heat to 80°C and react for 2 h to obtain prepolymer; the polyisocyanate is diphenylmethane diisocyanate.

[0081] (2) Add γ-aminopropyltriethoxysilane to the prepolymer, wherein the molar ratio of NCO group in the prepolymer to active hydrogen in γ-aminopropyltriethoxysilane is 0.9:1; react at 50°C for 2 h to obtain modified polyurethane resin.

[0082] The polyether polyols are a mixture of polyether polyol A (model HSH-204) with a hydroxyl value of 265~300 mgKOH / g, polyether polyol B (model 153~188) with a hydroxyl value of 153~188 mgKOH / g, and polyether polyol C (model HSH-215) with a hydroxyl value of 68~83 mgKOH / g, in a weight ratio of 1:1.2:0.5. They were purchased from Nantong Jiuzhe Chemical Co., Ltd.

[0083] The polyetheramine has an EO / PO ratio of 6 / 29 and an HLB value of 2.8. Brand: Maclean, item number P939193.

[0084] Comparative Example 1

[0085] The difference between this comparative example and Example 1 is that the modified mixed powder is replaced with a mixed powder, which includes the following components in parts by weight: 40 parts acrylic powder, 52 parts SiO2, and 7 parts lanthanum oxide.

[0086] Comparative Example 2

[0087] The difference between this comparative example and Example 1 is that the mixed powder includes the following components in parts by weight: 52 parts acrylic powder, 30 parts SiO2, and 17 parts lanthanum oxide.

[0088] Comparative Example 3

[0089] The difference between this comparative example and Example 1 is that the privacy protection component includes the following components in parts by weight: 95 parts of modified mixed powder, 18 parts of titanium dioxide, 44 parts of polyvinyl acetal, 33 parts of polyurethane acrylate, 16 parts of zinc oxide, 13 parts of tin oxide, 8 parts of AZO, 17 parts of ITO, and 11 parts of film-forming agent.

[0090] Comparative Example 4

[0091] The difference between this comparative example and Example 1 is that no polyetheramine is added to the modified polyurethane resin. The weight parts of polyetheramine are replaced with the same weight parts of polyether polyol.

[0092] Comparative Example 5

[0093] The difference between this comparative example and Example 1 is that the polyether polyol is a mixture of polyether polyol A with a hydroxyl value of 265~300mgKOH / g, polyether polyol B with a hydroxyl value of 153~188mgKOH / g, and polyether polyol C with a hydroxyl value of 68~83mgKOH / g, in a weight ratio of 1:1:1.

[0094] Comparative Example 6

[0095] The difference between this comparative example and Example 1 is that the explosion-proof component includes the following components in parts by weight: 30 parts SiO2, 17 parts lanthanum oxide, 46 parts modified polyurethane, 31 parts acrylic resin, 7 parts pressure-sensitive adhesive, 13 parts titanium dioxide, 2 parts potassium dihydrogen phosphate, 4 parts cerium oxide, and 6 parts film-forming agent.

[0096] Performance testing

[0097] The glasses prepared in Examples 1-2 and Comparative Examples 1-6 were used as samples for the following performance tests.

[0098] 1. Flexural strength: Prepare a clean, defect-free specimen; turn on the power switch, select the range, level the specimen, and place it; adjust the bow clamp and select the loading speed; test by pressing the slide hammer travel switch to slide the slide hammer to the left, increasing the load until the specimen breaks, at which point the slide hammer automatically moves forward. Read the maximum load from the corresponding position of the slide hammer pointer; return the slide hammer to its original position and rotate the slide hammer speed knob until the white line on the knob is aligned with "0"; measure the thickness and width of the specimen at the fracture point, accurate to 0.1 mm.

[0099]

[0100] Where Rf: flexural strength limit N / m2; P: load at specimen fracture, N; L: distance between the blades, 30mm; b: width at specimen fracture, mm; h: thickness at specimen fracture, mm.

[0101] 2. Compressive strength: The method is the same as the flexural strength test method. The specific calculation formula is:

[0102]

[0103] Where P: ultimate compressive strength, N / m2; F: maximum load on the material when it breaks, N; S: area of ​​the material subjected to force, m2.

[0104] 3. Flame retardant performance: The material was tested according to the UL-94 standard vertical burning method.

[0105] 4. Coefficient of thermal expansion: The coefficient of thermal expansion was tested using an STD dilatometer in accordance with standard GB / T16920-2015.

[0106]

[0107] The one-way vision explosion-proof glass of Embodiments 1-2 of the present invention not only has one-way vision and explosion-proof performance, but also has excellent mechanical properties, low coefficient of thermal expansion and good flame retardancy. In particular, the comprehensive performance of Embodiment 1 is the most outstanding, which is mainly due to the synergistic effect between the various parts.

[0108] The comparative examples, lacking the necessary technical solutions, showed significantly inferior performance compared to the exemplary examples in relevant tests. In Comparative Example 1, the mixed powder was not modified, resulting in a decrease in the mechanical properties of the glass. In Comparative Example 2, the lack of a mixed powder formulation led to a decline in mechanical properties. In Comparative Example 3, the altered proportions of the privacy shield also affected mechanical properties. In Comparative Example 4, the absence of polyetheramine in the modified polyurethane resin increased the coefficient of thermal expansion. In Comparative Example 5, the altered proportions of the polyether polyol increased the coefficient of thermal expansion. In Comparative Example 6, the different proportions of the explosion-proof components increased the coefficient of thermal expansion and decreased flame retardancy. These experimental results further demonstrate the importance of the technical solutions defined in this invention for its technical effectiveness.

[0109] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing one-way vision explosion-proof glass, characterized in that, Includes the following steps: (1) Clean the glass substrate to obtain a pretreated glass substrate: (2) Apply the privacy protection component evenly to one side of the pretreated glass substrate. After coating, bake at 240-260℃ for 10-15 minutes to harden the privacy protection component into a privacy protection layer with a thickness of 8-12μm. The privacy protection component comprises the following components in parts by weight: 100-110 parts modified mixed powder, 5-10 parts titanium dioxide, 32-35 parts polyvinyl acetal, 42-45 parts polyurethane acrylate, 12-15 parts zinc oxide, 15-17 parts tin oxide, 15-20 parts AZO, 5-10 parts ITO, and 10-12 parts film-forming agent. (3) The explosion-proof component is uniformly coated on the surface of the privacy layer and baked at 190-200℃ for 10-15 minutes to harden the explosion-proof component into an explosion-proof film with a thickness of 1.5-1.7μm, thus obtaining the glass rough product; (4) Place the rough glass in a medium frequency furnace, heat the medium frequency furnace to 450-470℃, heat for 10-15 minutes, and harden and shape it; Cooling and cleaning produce one-way vision explosion-proof glass; The method for preparing the modified mixed powder includes the following steps: (1) Mix the modified castor oil polyol and isocyanate-based propyltriethoxysilane and react at 40-45℃ for 2-3 hours to obtain the reaction product; (2) The reaction product, the mixed powder and ethanol are mixed and reacted at 50-55℃ for 4-6 hours. The ethanol is removed by rotary evaporation under reduced pressure to obtain the modified mixed powder. The weight ratio of the reaction product, the mixed powder and ethanol is 1:(90-95):(400-450). The mixed powder includes the following components in parts by weight: 38-43 parts acrylic powder, 50-55 parts SiO2 and 5-10 parts lanthanum oxide. The amount of modified castor oil polyol is calculated in OH molar amounts, and the amount of isocyanate-propyltriethoxysilane is calculated in NCO molar amounts. The molar ratio of modified castor oil polyol to isocyanate-propyltriethoxysilane is (2.2-2.7):

1. The explosion-proof component comprises the following components in parts by weight: 35-39 parts SiO2, 8-13 parts lanthanum oxide, 55-58 parts modified polyurethane, 20-25 parts acrylic resin, 6-8 parts pressure-sensitive adhesive, 5-10 parts titanium dioxide, 3-7 parts potassium dihydrogen phosphate, 6-9 parts cerium oxide, and 4-8 parts film-forming agent. The preparation method of the modified polyurethane resin includes the following steps: (1) Add polyetheramine dropwise to polyisocyanate and react at 45-50℃ for 1-2 hours. Then add polyether polyol and heat to 75-80℃ for 2-3 hours to obtain prepolymer. (2) Add γ-aminopropyltriethoxysilane to the prepolymer and react at 45-50℃ for 2-3 hours to obtain modified polyurethane resin.

2. The method for preparing one-way vision explosion-proof glass according to claim 1, characterized in that, The polyether polyol is a mixture of polyether polyol A with a hydroxyl value of 265~300mgKOH / g, polyether polyol B with a hydroxyl value of 153~188mgKOH / g, and polyether polyol C with a hydroxyl value of 68~83mgKOH / g, in a weight ratio of 1:(1.2-1.5):(0.5-0.8).

3. The method for preparing one-way vision explosion-proof glass according to claim 2, characterized in that, The polyisocyanate is at least one of diphenylmethane diisocyanate, methylcyclohexyl diisocyanate, and isophorone diisocyanate.

4. A one-way transparent explosion-proof glass prepared by the preparation method according to any one of claims 1-3.

Images