Anti-fog goggle nano-coating and method of making same

Abstract

The application relates to the field of paint, in particular to a kind of anti-fog goggles nano paint and preparation method thereof.The anti-fog goggles nano paint, by mass percentage, raw materials include: matrix resin 20-30%, modified filling particle 5-15%, active diluent 10-20%, thickening agent 1-2.5%, initiator 1-3%, auxiliary agent 0.1-10%, and deionized water makes up the rest.The anti-fog goggles nano paint provided by the application can have excellent anti-fog performance, and ensure the water resistance and boiling resistance of the paint during long-term use and storage.

Description

Technical Field

[0001] The present application relates to the field of coatings, and in particular to an anti-fog goggle nano coating and a preparation method thereof. Background Art

[0002] Fogging is a common natural phenomenon in everyday life. When the temperature reaches or approaches the dew point, water vapor in the air condenses into tiny dewdrops, forming a fog layer. Fogging on transparent surfaces can not only significantly reduce light transmittance but can also pose a significant safety hazard. For example, fogging on goggles can severely affect the wearer's vision, posing a significant safety hazard.

[0003] Goggles are primarily made of ordinary glass, which is primarily composed of silicon dioxide (SiO2, quartz). Since pure silica has a melting point of 2000°C, sodium carbonate (Na2CO3, soda) and potassium carbonate (K2CO3, potash) are typically added to the glass to lower its melting point to around 1000°C. However, sodium carbonate also dissolves the glass in water, so calcium oxide (CaO) is often added to make it insoluble. Due to the inherent insolubility of glass, water molecules condense (beading) when they come into contact with the glass, affecting vision and posing a significant safety hazard.

[0004] To address the fogging problem of goggles, the prior art patent CN111607320A provides a water-based polyurethane-silica sol composite anti-fogging agent. The main chain segment of the water-based polyurethane is PEG, which exhibits weak bonding strength and insufficient smoothness on different substrates during the actual film-forming process. This makes the hydrophilic silica microspheres susceptible to micropore clogging and unregulated surface double bonds, resulting in excessive crosslinking and reduced hydrophilicity during use, ultimately reducing the anti-fogging and water / boiling resistance of the coating / anti-fogging agent.

[0005] Therefore, in order to completely solve the above problems, the present application provides an anti-fog goggle nano coating, which can have excellent anti-fog performance while ensuring the water resistance and boiling resistance of the coating during long-term use and storage. Summary of the Invention

[0006] In order to solve the above problems, the first aspect of the present application provides an anti-fog goggles nano coating, the raw materials of which include, by mass percentage: 20-30% base resin, 5-15% modified filler particles, 10-20% active diluent, 1-2.5% thickener, 1-3% initiator, 0.1-10% auxiliary agent, and deionized water to make up the balance.

[0007] As a preferred solution, the base resin is a water-based modified polyurethane resin.

[0008] As a preferred solution, the modified filling particles are framework-modified TiO2-SiO2 composite particles.

[0009] As a preferred solution, the average particle size of the modified filler particles is 200 to 400 nm.

[0010] As a preferred solution, the average particle size of the modified filler particles is 250 to 300 nm.

[0011] As a preferred solution, the average particle size of the modified filler particles is 280 nm.

[0012] As a preferred solution, the mass ratio of the matrix resin to the modified filler particles is (25-29): (8-10).

[0013] As a preferred solution, the mass ratio of the matrix resin to the modified filler particles is (26-28):10.

[0014] As a preferred solution, the mass ratio of the matrix resin to the modified filler particles is 28:10.

[0015] As a preferred solution, the thickener is polyacrylamide.

[0016] As a preferred solution, the initiator is at least one of photoinitiators.

[0017] As a preferred solution, the auxiliary agent is at least one of an antioxidant, an anti-ultraviolet agent, a waterproofing agent, a preservative, an anti-yellowing agent, a dispersant, a tackifier, a leveling agent, a leveling aid, and a crosslinking agent.

[0018] As a preferred solution, the reactive diluent is at least one of acrylic acid, hydroxyethyl acrylamide, glycidyl methacrylate, and pentaerythritol triacrylate.

[0019] As a preferred solution, the reactive diluent is hydroxyethyl acrylamide or glycidyl methacrylate.

[0020] As a preferred solution, the reactive diluent is glycidyl methacrylate.

[0021] As a preferred solution, the preparation method of the water-based modified polyurethane resin includes the following steps: S1: stirring polyether polyol and isocyanate in a container and heating them to vacuum dehydration, then mixing the two and keeping them warm at 40-80°C for 1-4 hours under nitrogen protection to obtain a polyurethane prepolymer; S2: adding polyacrylate to the polyurethane prepolymer and keeping them warm at 40-80°C for 4-8 hours to obtain a water-based modified polyurethane resin.

[0022] As a preferred solution, the molecular weight of the polyether polyol is 1000-1500.

[0023] As a preferred solution, the average molecular weight of the polyether polyol is 1000.

[0024] As a preferred solution, the isocyanate is 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate; the mass ratio of the 4,4'-diphenylmethane diisocyanate to the 2,4'-diphenylmethane diisocyanate is (3-4):(1-1.5).

[0025] As a preferred solution, the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 3.5:1.2.

[0026] In the present application, in order to improve the transparency of the polyurethane prepolymer and the final resin, 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate are used as isocyanate reaction raw materials. If the content of 4,4'-diphenylmethane diisocyanate is too high, since the NCO group of 4,4'-diphenylmethane diisocyanate has higher activity, during the preparation process, after the reaction of 4,4'-diphenylmethane diisocyanate with the polyether polyol in the system reaches a certain extent, self-polymerization is likely to occur, resulting in increased viscosity of the prepolymer and deterioration of transparency. Conversely, if the content of 4,4'-diphenylmethane diisocyanate is too low, the prepolymerization time will be increased, thereby reducing the preparation efficiency of the isocyanate-terminated prepolymer.

[0027] As a preferred solution, the -NCO:-OH ratio of the polyether polyol to the isocyanate is (1.8-2.2): (0.8-1).

[0028] As a preferred solution, the -NCO:-OH ratio of the polyether polyol to the isocyanate is 2:1.

[0029] As a preferred scheme, the preparation method of the framework-modified TiO2-SiO2 composite particles includes the following steps: S1: dissolving succinic anhydride in DMF solution, adding (3-aminopropyl)triethoxysilane, and heating and stirring at a water bath temperature of 50-70°C for 1-2 hours; S2: adding the DMF solution containing TiO2 and SiO2 mixed particles dropwise into the reaction solution, continuously stirring and reacting for 3 hours, and then centrifuging to obtain composite particles; S3: mixing the composite particles with 2-methylimidazole and zinc nitrate, adding an organic solvent, and reacting at a stirring speed of 60-120 r / min for 2.5-3.5 hours to obtain the obtained particles.

[0030] As a preferred solution, the mass ratio of the composite particles to 2-methylimidazole and zinc nitrate is (0.5-1):(10-12):(3-5).

[0031] As a preferred solution, the mass ratio of the composite particles to 2-methylimidazole and zinc nitrate is 0.8:11:4.

[0032] In the present application, when framework-modified TiO2-SiO2 composite particles are used and their specific particle size is limited to 250-300nm, the anti-fog property, water resistance and water boiling resistance of the nano coating can be effectively improved, and the friction resistance is also beneficial. This is mainly because the framework-modified TiO2-SiO2 composite particles used in the present application can maintain good adhesion of the composite particles to the cured film in a composite state, and at the same time can form a fully wrapped state of TiO2-SiO2 for the framework structure, thereby actually forming an aggregated TiO2-SiO2 composite particle hydrophilic framework, thereby greatly improving the hydrophilic site effect when the composite particles are dispersed in the coating, thereby ensuring a stable framework that can improve wear resistance while forming a rough groove structure on the coating surface, thereby enclosing water around the site on the coating surface, forming a stable hydration layer, ensuring the existence of the hydration film layer while helping to prevent the penetration of water molecules.

[0033] As a preferred solution, the auxiliary agents are a leveling agent, a tackifier and an antioxidant; the mass ratio of the leveling agent, the tackifier and the antioxidant is (1-3):(1-10):(1-3).

[0034] As a preferred solution, the mass ratio of the leveling agent, tackifier and antioxidant is 1:10:1.

[0035] The second aspect of the present application provides a method for preparing the above-mentioned anti-fog goggles nano coating, which comprises the following steps: S1: adding the matrix resin, modified filler particles, active diluent, thickener, initiator, additive and deionized water to a container in sequence and mixing them evenly; S2: adding the mixture obtained in S1 to a new container, ultrasonically dispersing it for 20 to 40 minutes, and after the mixture becomes clear and transparent, mechanically stirring it for a second dispersion and sieving to obtain the product.

[0036] Beneficial effects:

[0037] 1. The present application provides an anti-fog goggle nano coating and a preparation method thereof, which can ensure the water resistance and boiling resistance of the coating during long-term use and storage while having excellent anti-fog performance, and has excellent market prospects.

[0038] 2. This application provides an anti-fog goggle nanocoating and a preparation method thereof. In order to improve the transparency of the polyurethane prepolymer and the final resin, 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate are used as isocyanate reaction raw materials, and the mass ratio of the two is controlled to ensure that self-polymerization is avoided, the appropriate prepolymer viscosity is retained, and the transparency is improved.

[0039] 3. The present application provides an anti-fog goggle nanocoating and a preparation method thereof. When the frame-modified TiO2-SiO2 composite particles are used and the specific particle size is limited to 250-300 nm, the anti-fog, water resistance and boiling resistance of the nanocoating can be effectively improved, and it is also beneficial to the friction resistance. At this time, an aggregated TiO2-SiO2 composite particle hydrophilic framework is actually formed, thereby greatly improving the hydrophilic site effect when the composite particles are dispersed in the coating, thereby ensuring that a stable framework can improve the wear resistance while forming a rough groove structure on the coating surface, thereby trapping water around the site on the coating surface to form a stable hydration layer.

[0040] 4. The present application provides an anti-fog goggle nano coating and a preparation method thereof. The preparation operation of the coating provided in the present application is simple, the reaction steps are simple, and the labor cost is effectively reduced. In addition, the prepared coating can be quickly cured under ultraviolet conditions when used. DETAILED DESCRIPTION

[0041] The following text further illustrates and demonstrates the technical solutions described in the above-mentioned summary of the invention in the form of specific implementation plans. The following examples are merely practical examples used to illustrate and explain the technical solutions in the specification and should not limit the scope of the claims to be protected by this application. All technical products based on the technical solutions described in the summary of the invention in this application should be included in the scope of protection to be protected by this application.

[0042] In the following examples, unless otherwise specified, the raw materials are all commercially available products or can be prepared by methods well known to those skilled in the art.

[0043] Example 1

[0044] Example 1 The first aspect provides an anti-fog goggle nano coating, which comprises, by mass percentage, 28% base resin, 10% modified filler particles, 12% active diluent, 1.5% thickener, 1% initiator, 8% auxiliary agent, and the balance made up of deionized water.

[0045] The base resin is a water-based modified polyurethane resin. The preparation method of the water-based modified polyurethane resin includes the following steps: S1: stirring polyether polyol and isocyanate in a container separately and heating them to vacuum dehydration, then mixing the two and keeping them warm at 50°C for 3 hours under nitrogen protection to obtain a polyurethane prepolymer; S2: adding polyacrylate to the polyurethane prepolymer and keeping it warm at 60°C for 5 hours to obtain a water-based modified polyurethane resin.

[0046] Among them, the polyether polyol is PPG-1000, purchased from Hai'an Petrochemical Plant in Jiangsu Province; the isocyanate is 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate, and the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 3.5:1.2.

[0047] In the raw materials, ensure that the -NCO:-OH ratio of polyether polyol and isocyanate is 2:1.

[0048] Polyacrylate was purchased from Wuhan Belleye Biopharmaceutical Technology Co., Ltd. The mass ratio of polyacrylate to polyurethane prepolymer was 0.2:1.

[0049] The modified filling particles are framework-modified TiO2-SiO2 composite particles, and the average particle size of the modified filling particles is 280 nm.

[0050] The preparation method of framework-modified TiO2-SiO2 composite particles includes the following steps, calculated in parts by mass: S1: dissolving 3 parts of succinic anhydride in 50 parts of DMF solution, adding 5 parts of (3-aminopropyl)triethoxysilane, and heating and stirring at a water bath temperature of 60°C for 1 hour; S2: adding 0.8 parts of 10 parts of DMF solution containing mixed particles of TiO2 and SiO2 (mass ratio 1:1) dropwise into the reaction solution, continuously stirring and reacting for 3 hours, and then centrifuging to obtain 0.8 parts of composite particles; S3: mixing 0.8 parts of composite particles with 11 parts of 2-methylimidazole and 4 parts of zinc nitrate, adding an organic solvent, and reacting at a stirring speed of 80r / min for 3 hours to obtain the obtained product.

[0051] The thickener is polyacrylamide, which is 1400 polyacrylamide purchased from Suzhou Weifei Environmental Protection Chemical Co., Ltd.; the initiator is photoinitiator 1173D.

[0052] The reactive diluent is glycidyl methacrylate.

[0053] The additives are a leveling agent, a tackifier and an antioxidant; the mass ratio of the leveling agent, the tackifier and the antioxidant is 1:10:1; the tackifier is isopropyl alcohol; the leveling agent is BYK-333; and the antioxidant is antioxidant 1010.

[0054] The second aspect of this embodiment provides a method for preparing the above-mentioned anti-fog goggles nano coating, which includes the following steps: S1: adding the base resin, modified filler particles, active diluent, thickener, initiator, additive and deionized water to a container in sequence and mixing them evenly; S2: adding the mixture obtained in S1 to a new container, ultrasonically dispersing for 30 minutes, and after the mixture becomes clear and transparent, mechanically stirring it for a second dispersion and sieving to obtain the product.

[0055] Example 2

[0056] Example 2 The first aspect provides an anti-fog goggle nano coating, which includes, by mass percentage, 29% base resin, 8% modified filler particles, 12% active diluent, 1.5% thickener, 1% initiator, 8% auxiliary agent, and deionized water to make up the balance.

[0057] The base resin is a water-based modified polyurethane resin. The preparation method of the water-based modified polyurethane resin includes the following steps: S1: stirring polyether polyol and isocyanate in a container separately and heating them to vacuum dehydration, then mixing the two and keeping them warm at 50°C for 3 hours under nitrogen protection to obtain a polyurethane prepolymer; S2: adding polyacrylate to the polyurethane prepolymer and keeping it warm at 60°C for 5 hours to obtain a water-based modified polyurethane resin.

[0058] Among them, the polyether polyol is PPG-1000, purchased from Hai'an Petrochemical Plant in Jiangsu Province; the isocyanate is 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate, and the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 4:1.

[0059] In the raw materials, ensure that the -NCO:-OH ratio of polyether polyol and isocyanate is 2:1.

[0060] Polyacrylate was purchased from Wuhan Belleye Biopharmaceutical Technology Co., Ltd. The mass ratio of polyacrylate to polyurethane prepolymer was 0.15:1.

[0061] The modified filling particles are framework-modified TiO2-SiO2 composite particles, and the average particle size of the modified filling particles is 300 nm.

[0062] The preparation method of framework-modified TiO2-SiO2 composite particles includes the following steps, calculated in parts by mass: S1: dissolving 3 parts of succinic anhydride in 50 parts of DMF solution, adding 5 parts of (3-aminopropyl)triethoxysilane, and heating and stirring at a water bath temperature of 60°C for 1 hour; S2: adding 0.8 parts of 10 parts of DMF solution containing mixed particles of TiO2 and SiO2 (mass ratio 1:1) dropwise into the reaction solution, continuously stirring and reacting for 3 hours, and then centrifuging to obtain 0.8 parts of composite particles; S3: mixing 0.8 parts of composite particles with 11 parts of 2-methylimidazole and 4 parts of zinc nitrate, adding an organic solvent, and reacting at a stirring speed of 80r / min for 3.5 hours to obtain the obtained product.

[0063] The thickener is polyacrylamide, which is 1400 polyacrylamide purchased from Suzhou Weifei Environmental Protection Chemical Co., Ltd.; the initiator is photoinitiator 1173D.

[0064] The reactive diluent is glycidyl methacrylate.

[0065] The additives are a leveling agent, a tackifier and an antioxidant; the mass ratio of the leveling agent, the tackifier and the antioxidant is 1:10:1; the tackifier is isopropyl alcohol; the leveling agent is BYK-333; and the antioxidant is antioxidant 1010.

[0066] The second aspect of this embodiment provides a method for preparing the above-mentioned anti-fog goggles nano coating, which includes the following steps: S1: adding the base resin, modified filler particles, active diluent, thickener, initiator, additive and deionized water to a container in sequence and mixing them evenly; S2: adding the mixture obtained in S1 to a new container, ultrasonically dispersing for 30 minutes, and after the mixture becomes clear and transparent, mechanically stirring it for a second dispersion and sieving to obtain the product.

[0067] Example 3

[0068] Example 3 The first aspect provides an anti-fog goggle nano coating, which includes, by mass percentage, 26% base resin, 10% modified filler particles, 12% active diluent, 1.5% thickener, 1% initiator, 10% auxiliary agent, and deionized water to make up the balance.

[0069] The base resin is a water-based modified polyurethane resin. The preparation method of the water-based modified polyurethane resin includes the following steps: S1: stirring polyether polyol and isocyanate in a container separately and heating them to vacuum dehydration, then mixing the two and keeping them warm at 50°C for 3 hours under nitrogen protection to obtain a polyurethane prepolymer; S2: adding polyacrylate to the polyurethane prepolymer and keeping it warm at 60°C for 5 hours to obtain a water-based modified polyurethane resin.

[0070] Among them, the polyether polyol is PPG-1000, purchased from Hai'an Petrochemical Plant in Jiangsu Province; the isocyanate is 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate, and the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 4:1.2.

[0071] In the raw materials, ensure that the -NCO:-OH ratio of polyether polyol and isocyanate is 2:1.

[0072] Polyacrylate was purchased from Wuhan Belleye Biopharmaceutical Technology Co., Ltd. The mass ratio of polyacrylate to polyurethane prepolymer was 0.2:1.

[0073] The modified filling particles are framework-modified TiO2-SiO2 composite particles, and the average particle size of the modified filling particles is 250 nm.

[0074] The preparation method of framework-modified TiO2-SiO2 composite particles includes the following steps, calculated in parts by mass: S1: dissolving 3 parts of succinic anhydride in 50 parts of DMF solution, adding 5 parts of (3-aminopropyl)triethoxysilane, and heating and stirring at a water bath temperature of 60°C for 1 hour; S2: adding 0.8 parts of 10 parts of DMF solution containing mixed particles of TiO2 and SiO2 (mass ratio 1:1) dropwise into the reaction solution, stirring continuously for 3 hours, and then centrifuging to obtain 0.8 parts of composite particles; S3: mixing 0.8 parts of composite particles with 11 parts of 2-methylimidazole and 4 parts of zinc nitrate, adding an organic solvent, and reacting at a stirring speed of 80r / min for 2.5 hours to obtain the obtained product.

[0075] The thickener is polyacrylamide, which is 1400 polyacrylamide purchased from Suzhou Weifei Environmental Protection Chemical Co., Ltd.; the initiator is photoinitiator 1173D.

[0076] The reactive diluent is glycidyl methacrylate.

[0077] The additives are a leveling agent, a tackifier and an antioxidant; the mass ratio of the leveling agent, the tackifier and the antioxidant is 1:10:1; the tackifier is isopropyl alcohol; the leveling agent is BYK-333; and the antioxidant is antioxidant 1010.

[0078] The second aspect of this embodiment provides a method for preparing the above-mentioned anti-fog goggles nano coating, which includes the following steps: S1: adding the base resin, modified filler particles, active diluent, thickener, initiator, additive and deionized water to a container in sequence and mixing them evenly; S2: adding the mixture obtained in S1 to a new container, ultrasonically dispersing for 30 minutes, and after the mixture becomes clear and transparent, mechanically stirring it for a second dispersion and sieving to obtain the product.

[0079] Comparative Example 1

[0080] The specific implementation of Comparative Example 1 is basically the same as that of Example 1, with the only difference being that in the preparation method of framework-modified TiO2-SiO2 composite particles, the reaction time of the composite particles with 2-methylimidazole and zinc nitrate is 1.5 h, and the average particle size of the modified filling particles is 200 nm.

[0081] Comparative Example 2

[0082] The specific implementation of Comparative Example 2 is basically the same as that of Example 1, with the only difference being that in the preparation method of the framework-modified TiO2-SiO2 composite particles, the reaction time of the composite particles with 2-methylimidazole and zinc nitrate is 5 hours, and the average particle size of the modified filler particles is 400 nm.

[0083] Comparative Example 3

[0084] The specific implementation of Comparative Example 3 is substantially the same as that of Example 1, except that the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 1:1.

[0085] Comparative Example 4

[0086] The specific implementation of Comparative Example 4 is substantially the same as that of Example 1, except that the mass ratio of 4,4'-diphenylmethane diisocyanate to 2,4'-diphenylmethane diisocyanate is 4:0.5.

[0087] Performance evaluation

[0088] The coatings prepared in the examples and comparative examples were coated on a glass substrate to a film thickness of 10 μm and cured under ultraviolet conditions at 100° C. for 60 minutes. The following performance tests were performed on the samples.

[0089] Light transmittance: The sample was tested for light transmittance using a light transmittance tester, and the average value of the results was taken 10 times and recorded in Table 1.

[0090] Anti-fog property: The sample is fumigated with 60℃ saturated steam at a distance of 5cm for 3 seconds without fogging, wiped clean, and fumigated again. If the anti-fog performance does not decay, it is recorded as qualified, otherwise it is recorded as unqualified; the sample is soaked in 25℃ water for 72 hours, fumigated for 30 seconds, and the anti-fog performance does not decay. After that, it is heated to 80℃ and stored for 8 hours after 2 hours at -35℃, and cycled 100 times. The anti-fog property does not decay. The film layer remains transparent and the anti-fog property does not decay after continuous fumigation at 100℃ for 2 hours. It is recorded as qualified, otherwise it is recorded as unqualified; the above test is repeated 100 times, and the qualified rate is calculated. The qualified rate = qualified number of times ÷ 100 × 100%, which is recorded in Table 1.

[0091] Boiling resistance: Soak the sample in 80℃ water for 1 hour, then observe the anti-fog effect and the condition of the film. If the anti-fog effect is not weakened and the film is transparent, it is qualified. Otherwise, it is unqualified. Repeat 100 times and calculate the qualified rate. The qualified rate = qualified times ÷ 100 × 100%, and record it in Table 1.

[0092] Table 1

[0093] Example Light transmittance (%) Anti-fog property (%) Boiling resistance (%) Example 1 98.4 95.6 94.5 Example 2 97.9 95.1 94.1 Example 3 98.1 94.8 94.3 Comparative Example 1 97.1 87.8 88.8 Comparative Example 2 96.9 88.9 90.1 Comparative Example 3 92.1 92.1 93.2 Comparative Example 4 91.5 93.4 91.9

Claims

1. An anti-fog goggles nano coating, characterized by: Calculated by mass percentage, the raw materials include: base resin 20-30%, modified filler particles 5-15%, active diluent 10-20%, thickener 1-2.5%, initiator 1-3%, additive 0.1-10%, and deionized water to make up the balance; The modified filling particles are framework-modified TiO2-SiO2 composite particles, and the average particle size thereof is 200-400 nm; The mass ratio of the matrix resin to the modified filler particles is (25-29): (8-10); The thickener is polyacrylamide; The base resin is a water-based modified polyurethane resin, and its preparation method includes the following steps: S1: stirring polyether polyol and isocyanate in a container, heating them to vacuum dehydration, then mixing the two, and keeping the temperature at 40-80°C for 1-4 hours under nitrogen protection to obtain a polyurethane prepolymer; S2: adding polyacrylate to the polyurethane prepolymer, and keeping the temperature at 40-80°C for 4-8 hours to obtain a water-based modified polyurethane resin; The molecular weight of the polyether polyol is 1000-1500; The isocyanate is 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate; the mass ratio of the 4,4'-diphenylmethane diisocyanate to the 2,4'-diphenylmethane diisocyanate is (3-4): (1-1.5); The preparation method of the framework-modified TiO2-SiO2 composite particles comprises the following steps: S1: dissolving succinic anhydride in a DMF solution, adding (3-aminopropyl)triethoxysilane, and heating and stirring at a water bath temperature of 50-70°C for 1-2 hours; S2: dropwise adding the DMF solution containing the mixed particles of TiO2 and SiO2 into the reaction solution, continuously stirring and reacting for 3 hours, and then centrifuging to obtain composite particles; S3: mixing the composite particles with 2-methylimidazole and zinc nitrate, adding an organic solvent, and reacting at a stirring speed of 60-120 r / min for 2.5-3.5 hours to obtain the composite particles; The mass ratio of the composite particles to 2-methylimidazole and zinc nitrate is (0.5-1): (10-12): (3-5); The initiator is a photoinitiator; The auxiliary agent is at least one of an antioxidant, an anti-ultraviolet agent, a waterproofing agent, a preservative, an anti-yellowing agent, a dispersant, a tackifier, a leveling agent, and a cross-linking agent.

2. The anti-fog goggles nano coating according to claim 1, characterized in that: The active diluent is at least one of acrylic acid, hydroxyethyl acrylamide, glycidyl methacrylate, and pentaerythritol triacrylate.

3. The anti-fog goggles nano coating according to claim 2, characterized in that: The -NCO:-OH ratio of the polyether polyol and the isocyanate is (1.8-2.2): (0.8-1).

4. The anti-fog goggles nano coating according to claim 3, characterized in that: The auxiliary agents are a leveling agent, a tackifier and an antioxidant; the mass ratio of the leveling agent, the tackifier and the antioxidant is (1~3): (1~10): (1~3).

5. A method for preparing the anti-fog goggles nano coating according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1: Add the base resin, modified filler particles, active diluent, thickener, initiator, additive and deionized water to the container in sequence and mix them evenly; S2: Add the mixture obtained in S1 to a new container and ultrasonically disperse it for 20-40 minutes. After the mixture becomes clear and transparent, mechanically stir it for a second dispersion to obtain the product.