Antifogging film, method for manufacturing the same, sun protection film comprising the same, and use of the sun protection film

Abstract

The present application relates to the technical field of sunshade film, in particular to an anti-fog film, comprising a polymer matrix layer and an anti-fog coating layer, the anti-fog coating layer is prepared on the surface of the polymer matrix layer; the anti-fog coating layer comprises hydrophilic functional molecules; and the anti-fog coating layer and the polymer matrix layer are connected by chemical grafting to obtain the anti-fog film. The anti-fog film can prevent the occurrence of the case that fog droplets are generated on the surface of the anti-fog film due to changes in temperature and humidity, thereby reducing the perspective of the anti-fog film, and is convenient to apply to the sunshade film of glass.

Description

Technical Field

[0001] This invention relates to the field of sunshade film technology, specifically to an anti-fog film and its preparation method, a sunshade film containing the same, and the application of the sunshade film. Background Technology

[0002] The applications of sunshade film mainly involve improving heat insulation and energy saving, blocking ultraviolet rays, explosion and shock resistance, increasing privacy, preventing glare, and preventing radiation. As an effective sunshade product, sunshade film has a wide range of applications, mainly in the following areas: commercial buildings, hotels, restaurants and entertainment venues, automotive supplies, and agriculture.

[0003] Taking automobiles as an example, as one of the main means of transportation, the energy consumption and comfort of cars have become a focus of attention. Solar shading film, as a highly efficient and energy-saving automotive accessory, is typically installed on car windows. It not only blocks ultraviolet and infrared rays from sunlight, reducing interior temperature and improving comfort, but also lowers air conditioning energy consumption, thus achieving energy conservation and emission reduction. However, traditional solar shading films are prone to fogging in high humidity environments, affecting driving safety and user experience. In the field of architectural shading doors and windows, the same fogging problem easily occurs on the interior side of shading doors and windows, affecting room lighting and people's view through the windows.

[0004] The reason why sunshade film fogs up is that when there is a large temperature difference between indoors and outdoors, as indoor humidity increases and the surface temperature of the car window decreases, when the surface temperature of the sunshade film drops below the dew point temperature, the water vapor in the room will condense into small liquid droplets on the inside of the car window. As these droplets gradually increase in number and size, they will gradually reduce the light transmission and visibility of the sunshade film, thus affecting the vision of people inside the room.

[0005] Therefore, there is an urgent need for an anti-fog film that can reduce the impact of fogging on visibility. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-fog film to improve the problem that sunshade films are prone to fogging and droplets, which reduces their transparency.

[0007] This invention is achieved through the following technical solution: An anti-fog film includes a polymer matrix layer and an anti-fog coating, wherein the anti-fog coating is prepared on the surface of the polymer matrix layer; Anti-fog coatings include hydrophilic functional molecules; An anti-fog film is obtained by chemical grafting between the anti-fog coating and the polymer matrix layer.

[0008] Furthermore, the polymer matrix layer needs to be obtained through plasma treatment.

[0009] Furthermore, the polymer matrix layer is a polymer with active reactive groups produced by plasma treatment of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene, polyimide, and polyethylene.

[0010] Furthermore, the hydrophilic functional molecule is at least one of polyethylene glycol methacrylate and polyethylene glycol dimethacrylate.

[0011] The present invention also provides a method for preparing the above-mentioned anti-fog film, comprising the following steps: S1. The polymer matrix is ​​subjected to plasma treatment to introduce active reactive groups to obtain a polymer matrix layer; S2. Prepare a coating reaction solution containing hydrophilic functional molecules; S3. Apply the coating reaction solution to the surface of the polymer matrix layer, so that a chemical grafting reaction occurs between the surface of the polymer matrix layer and the coating reaction solution to obtain an anti-fog coating. The anti-fog coating and the polymer matrix layer combine to form an anti-fog film.

[0012] Further, in steps S2 and S3, a reaction solution and a coating solution are prepared respectively, with a volume ratio of 2:1 between the reaction solution and the coating solution. The coating solution includes 5-10% by mass of hydrophilic functional molecules and 1-2% by mass of photoinitiator. The reaction solution and the coating solution are stirred and mixed to obtain the coating reaction solution. When the polymer matrix layer is made of any one of polymethyl methacrylate, polyethylene terephthalate, polypropylene, or polyethylene, the reaction solution includes acrylic acid, ammonium persulfate, and sodium sulfite, and the mass fraction ratio of acrylic acid, ammonium persulfate, and sodium sulfite is 7.5~10.5%:0.3~1.2%:0.3~1.2%. The chemical grafting reaction temperature is 65~70℃, and then the surface of the polymer matrix layer is cleaned with deionized water. When the polymer matrix layer is made of polycarbonate, the reaction solution is 5% acryloyl chloride, the solvent of the reaction solution is toluene, the chemical grafting reaction temperature is room temperature, and then the surface of the polymer matrix layer is cleaned with toluene and ethanol. When the polymer matrix layer is made of polypropylene, the solvent of the reaction solution is water; and when the polymer matrix layer is made of any one of polymethyl methacrylate, polyethylene terephthalate, or polyethylene, the solvent of the reaction solution includes ethanol. The drying temperature for the polymer matrix layer surface is 45~50℃, and the drying time is 8~12h.

[0013] Furthermore, in step S5, during the curing process, the surface of the polymer matrix layer is irradiated with an ultraviolet light source for 20 to 30 minutes.

[0014] Furthermore, the thickness of the polymer matrix layer is 40-50 micrometers, and the thickness of the anti-fog coating is 1-5 micrometers.

[0015] The present invention also provides an application of the above-mentioned anti-fog film, wherein a protective layer is provided on the anti-fog coating of the anti-fog film, and a solar energy blocking layer, a substrate layer and an adhesive layer are sequentially bonded on the polymer matrix layer of the anti-fog film, and a protective layer is also provided on the surface of the adhesive layer, thereby obtaining a sunshade film.

[0016] The present invention also provides the application of the above-mentioned sunshade film on automotive window glass or architectural window glass.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: In this invention, hydrophilic functional molecules can be copolymerized with other monomers through free radical polymerization. These hydrophilic functional molecules are then chemically grafted onto the surface of the polymer matrix to form an anti-fog coating. The hydrophilicity of the hydrophilic functional molecules in the anti-fog coating allows them to adsorb water molecules and form a uniform water film, rather than densely packed water droplets. This uniformly distributed water film does not affect the transparency of the anti-fog film. The grafting of the anti-fog coating onto the polymer matrix gives the anti-fog film surface better wettability and hydrophilicity, allowing it to maintain good transparency even in high humidity environments. Applying the anti-fog film to the inner surface of a sunshade film helps prevent the inner surface of the sunshade film from becoming fogged up, thus reducing its transparency. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0019] Example 1 An anti-fog film includes a polymer matrix layer and an anti-fog coating, wherein the anti-fog coating is prepared on the surface of the polymer matrix layer; Anti-fog coatings include hydrophilic functional molecules; An anti-fog film is obtained by chemical grafting between the anti-fog coating and the polymer matrix layer.

[0020] Furthermore, the polymer matrix layer needs to be obtained through plasma treatment.

[0021] Furthermore, the polymer matrix layer is a polymer with active reactive groups produced by plasma treatment of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene, polyimide, and polyethylene.

[0022] Furthermore, the hydrophilic functional molecule is at least one of polyethylene glycol methacrylate and polyethylene glycol dimethacrylate.

[0023] Hydrophilic functional molecules can be copolymerized with other monomers through free radical polymerization. By chemically grafting, hydrophilic functional molecules are grafted onto the surface of the polymer matrix to form an anti-fog coating. The hydrophilicity of the hydrophilic functional molecules in the anti-fog coating allows them to adsorb water molecules and form a uniform water film, rather than densely packed water droplets. This uniformly distributed water film does not affect the transparency of the anti-fog film. After the anti-fog coating is grafted onto the polymer matrix, it increases the surface energy of the anti-fog film surface, giving it better wettability and hydrophilicity. This allows the anti-fog film to maintain good transparency even in high humidity environments. Applying the anti-fog film to the inner surface of the sunshade film helps prevent the inner surface of the sunshade film from being reduced in transparency due to fogging.

[0024] The present invention also provides a method for preparing the above-mentioned anti-fog film, comprising the following steps: S1. The polymer matrix is ​​subjected to plasma treatment to introduce active reactive groups to obtain a polymer matrix layer; S2. Prepare a coating reaction solution containing hydrophilic functional molecules; S3. Apply the coating reaction solution to the surface of the polymer matrix layer, so that a chemical grafting reaction occurs between the surface of the polymer matrix layer and the coating reaction solution to obtain an anti-fog coating. The anti-fog coating and the polymer matrix layer combine to form an anti-fog film.

[0025] Further, in steps S2 and S3, a reaction solution and a coating solution are prepared respectively, with a volume ratio of 2:1 between the reaction solution and the coating solution. The coating solution includes 5-10% by mass of hydrophilic functional molecules and 1-2% by mass of photoinitiator. The reaction solution and the coating solution are stirred and mixed to obtain the coating reaction solution. When the polymer matrix layer is made of any one of polymethyl methacrylate, polyethylene terephthalate, polypropylene, or polyethylene, the reaction solution includes acrylic acid, ammonium persulfate, and sodium sulfite, and the mass fraction ratio of acrylic acid, ammonium persulfate, and sodium sulfite is 7.5~10.5%:0.3~1.2%:0.3~1.2%. The chemical grafting reaction temperature is 65~70℃, and then the surface of the polymer matrix layer is cleaned with deionized water. When the polymer matrix layer is made of polycarbonate, the reaction solution is 5% acryloyl chloride, the solvent of the reaction solution is toluene, the chemical grafting reaction temperature is room temperature, and then the surface of the polymer matrix layer is cleaned with toluene and ethanol. When the polymer matrix layer is made of polypropylene, the solvent of the reaction solution is water; and when the polymer matrix layer is made of any one of polymethyl methacrylate, polyethylene terephthalate, or polyethylene, the solvent of the reaction solution includes ethanol. The drying temperature for the polymer matrix layer surface is 45~50℃, and the drying time is 8~12h.

[0026] Furthermore, in step S5, during the curing process, the surface of the polymer matrix layer is irradiated with an ultraviolet light source for 20 to 30 minutes.

[0027] Furthermore, the thickness of the polymer matrix layer is 40-50 micrometers, and the thickness of the anti-fog coating is 1-5 micrometers.

[0028] Example 1 A polymer matrix layer with a thickness of 50 micrometers was prepared using polymethyl methacrylate (PMMA). The polymer matrix layer was subjected to plasma treatment for 5 minutes using an oxygen plasma treatment device with a power of 100W, wherein the oxygen flow rate was 30 sccm, the treatment pressure was 0.2 Torr, and the treatment temperature was room temperature.

[0029] Preparation of the reaction solution: Using ethanol as the solvent, add 10 wt% acrylic acid, 1 wt% ammonium persulfate, and 1 wt% sodium sulfite to ethanol, making the reaction solution volume 100 ml. Preparation of the coating solution: Using ethanol as the solvent, add 5 wt% polyethylene glycol dimethacrylate and 1 wt% photoinitiator (Irgacure 184) to ethanol, making the solution volume 50 ml. Mix the reaction solution and coating solution by stirring at 300 rpm to obtain the coating reaction solution.

[0030] The coating reaction solution was spin-coated onto the surface of the polymer matrix layer, causing a chemical grafting reaction to occur on the surface of the polymer matrix layer. The reaction temperature was 70℃ and the reaction time was 2h.

[0031] Subsequently, the surface of the polymer matrix layer was cleaned three times with deionized water, and then dried at 50°C for 12 hours.

[0032] The surface of the polymer matrix layer was irradiated and cured using ultraviolet light with a wavelength of 365nm for 20 minutes, so that the surface of the polymer matrix layer was cured to form an anti-fog coating. The anti-fog coating and the polymer matrix layer together form an anti-fog film.

[0033] Performance testing: After testing, the light transmittance of the prepared anti-fog film was >90%; Anti-fog performance: In an environment with a relative humidity of 90% and a temperature of 25℃, no independent fog droplets are generated (a uniform water film is formed), and the test time is 2 hours; UV protection: Blocks 99.9% of UV-A and UV-B rays.

[0034] Example 2 A polymer matrix layer with a thickness of 50 micrometers was prepared using polycarbonate (PC). The polymer matrix layer was subjected to plasma treatment for 10 minutes using an argon plasma treatment device with a power of 120W, wherein the argon flow rate was 40 sccm, the treatment pressure was 0.3 Torr, and the treatment temperature was room temperature.

[0035] Preparation of the reaction solution: Using toluene as the solvent, add 5 wt% acryloyl chloride to the toluene, resulting in a reaction solution volume of 100 ml. Preparation of the coating solution: Using ethanol as the solvent, add 10 wt% polyethylene glycol methacrylate and 2 wt% photoinitiator (Irgacure 819) to the ethanol, resulting in a solution volume of 50 ml. Mix the reaction solution and the coating solution by stirring at 300 rpm to obtain the coating reaction solution.

[0036] The coating reaction solution was spin-coated onto the surface of the polymer matrix layer, causing a chemical grafting reaction to occur on the surface of the polymer matrix layer. The reaction temperature was room temperature, and the reaction time was 1 hour.

[0037] Subsequently, the surface of the polymer matrix layer was cleaned three times with a mixture of deionized water, toluene, and ethanol, and then dried at 50°C for 12 hours.

[0038] The surface of the polymer matrix layer was irradiated and cured using ultraviolet light with a wavelength of 365nm for 30 minutes, so that the surface of the polymer matrix layer was cured to form an anti-fog coating. The anti-fog coating and the polymer matrix layer together form an anti-fog film.

[0039] Performance testing: After testing, the light transmittance of the prepared anti-fog film was >90%; Anti-fog performance: In an environment with a relative humidity of 90% and a temperature of 25℃, no independent fog droplets are generated (a uniform water film is formed), and the test time is 2 hours; UV protection: Blocks 99.9% of UV-A and UV-B rays.

[0040] Example 3 A polymer matrix layer with a thickness of 50 micrometers was prepared using polyethylene terephthalate (PET). The polymer matrix layer was subjected to plasma treatment for 10 minutes using an oxygen plasma treatment device with a power of 120W, wherein the oxygen flow rate was 35 sccm, the treatment pressure was 0.25 Torr, and the treatment temperature was room temperature.

[0041] Preparation of the reaction solution: Water and ethanol were used as solvents in a 1:1 volume ratio. 10 wt% acrylic acid, 1 wt% ammonium persulfate, and 1 wt% sodium sulfite were added to the solvent, resulting in a reaction solution volume of 100 ml. Preparation of the coating solution: Ethanol was used as the solvent. 7 wt% polyethylene glycol dimethacrylate (PEGDMA) and 1.5 wt% photoinitiator (Irgacure 184) were added to the ethanol, resulting in a solution volume of 50 ml. The reaction solution and coating solution were mixed by stirring at 250 rpm to obtain the coating reaction solution.

[0042] The coating reaction solution was spin-coated onto the surface of the polymer matrix layer, causing a chemical grafting reaction to occur on the surface of the polymer matrix layer. The reaction temperature was 65℃ and the reaction time was 1.5h.

[0043] Subsequently, the surface of the polymer matrix layer was cleaned three times with deionized water, and then dried at 45°C for 8 hours.

[0044] The surface of the polymer matrix layer was irradiated and cured using ultraviolet light with a wavelength of 365nm for 25 minutes, so that the surface of the polymer matrix layer was cured to form an anti-fog coating. The anti-fog coating and the polymer matrix layer together form an anti-fog film.

[0045] Performance testing: After testing, the light transmittance of the prepared anti-fog film was >92%; Anti-fog performance: In an environment with a relative humidity of 90% and a temperature of 25℃, no independent fog droplets are generated (a uniform water film is formed), and the test time is 2 hours; UV protection: Blocks 99.9% of UV-A and UV-B rays.

[0046] Example 4 A polymer matrix layer with a thickness of 40 micrometers was prepared using polypropylene (PP). The polymer matrix layer was subjected to plasma treatment for 8 minutes using an argon plasma treatment device with a power of 100W, wherein the oxygen flow rate was 30 sccm, the treatment pressure was 0.2 Torr, and the treatment temperature was room temperature.

[0047] Preparation of the reaction solution: Using water as the solvent, add 8 wt% acrylic acid, 0.5 wt% ammonium persulfate, and 0.5 wt% sodium sulfite to the solvent, making the volume of the reaction solution 100 ml. Preparation of the coating solution: Using ethanol as the solvent, add 10 wt% polyethylene glycol methacrylate (PEGMA) and 2 wt% photoinitiator (Irgacure 819) to the ethanol, making the volume of the solution 50 ml. Mix the reaction solution and the coating solution by stirring at 300 rpm to obtain the coating reaction solution.

[0048] The coating reaction solution was spin-coated onto the surface of the polymer matrix layer, causing a chemical grafting reaction to occur on the surface of the polymer matrix layer. The reaction temperature was 70℃ and the reaction time was 1 hour.

[0049] Subsequently, the surface of the polymer matrix layer was cleaned three times with deionized water, and then dried at 50°C for 10 hours.

[0050] The surface of the polymer matrix layer was irradiated and cured using ultraviolet light with a wavelength of 365nm for 20 minutes, so that the surface of the polymer matrix layer was cured to form an anti-fog coating. The anti-fog coating and the polymer matrix layer together form an anti-fog film.

[0051] Performance testing: After testing, the light transmittance of the prepared anti-fog film was >90%; Anti-fog performance: In an environment with a relative humidity of 90% and a temperature of 25℃, no independent fog droplets are generated (a uniform water film is formed), and the test time is 2 hours; UV protection: Blocks 99.9% of UV-A and UV-B rays.

[0052] Example 5 A polymer matrix layer with a thickness of 45 micrometers was prepared using polyethylene (PE). The polymer matrix was subjected to plasma treatment for 6 minutes using an oxygen plasma treatment device with a power of 110W, wherein the oxygen flow rate was 32 sccm, the treatment pressure was 0.22 Torr, and the treatment temperature was room temperature.

[0053] Preparation of the reaction solution: Using ethanol and water as solvents, with a volume ratio of ethanol to water of 2:1, add 9 wt% acrylic acid, 1 wt% ammonium persulfate, and 1 wt% sodium sulfite to the solvent, resulting in a reaction solution volume of 100 ml. Preparation of the coating solution: Using ethanol as solvent, add 6 wt% polyethylene glycol methacrylate (PEGMA), 4 wt% polyethylene glycol dimethacrylate (PEGDMA), and 1.5 wt% photoinitiator (Irgacure 184) to the ethanol, resulting in a solution volume of 50 ml. Mix the reaction solution and coating solution by stirring at 300 rpm to obtain the coating reaction solution.

[0054] The coating reaction solution was spin-coated onto the surface of the polymer matrix layer, causing a chemical grafting reaction to occur on the surface of the polymer matrix layer. The reaction temperature was 70℃ and the reaction time was 1.5h.

[0055] Subsequently, the surface of the polymer matrix layer was cleaned three times with deionized water, and then dried at 50°C for 12 hours.

[0056] The surface of the polymer matrix layer was irradiated and cured using ultraviolet light with a wavelength of 365nm for 25 minutes, so that the surface of the polymer matrix layer was cured to form an anti-fog coating. The anti-fog coating and the polymer matrix layer together form an anti-fog film.

[0057] Performance testing: After testing, the light transmittance of the prepared anti-fog film was >91%; Anti-fog performance: In an environment with a relative humidity of 90% and a temperature of 25℃, no independent fog droplets are generated (a uniform water film is formed), and the test time is 2 hours; UV protection: Blocks 99.9% of UV-A and UV-B rays.

[0058] This invention also provides an application of the aforementioned anti-fog film. A protective layer is provided on the anti-fog coating of the anti-fog film. A solar energy blocking layer, a substrate layer, and an adhesive layer are sequentially bonded to the polymer matrix layer of the anti-fog film. A protective layer is also provided on the surface of the adhesive layer, thus forming a sunshade film. The substrate layer is made of materials including, but not limited to, polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene, polyimide, or polyethylene. The solar energy blocking layer includes, but is not limited to, a metal layer and a ceramic layer. The ceramic layer mainly includes materials such as titanium oxide, indium tin oxide, zinc oxide, aluminum oxide, zinc sulfide, silicon carbide, and titanium nitride. These high-performance ceramic materials can effectively block ultraviolet and infrared rays while maintaining high light transmittance, improving the overall performance of the sunshade film, reducing heat entering the room, and improving energy efficiency and living comfort. The metal layer mainly includes silver, aluminum, titanium, nickel, gold, chromium, and copper. These materials have high reflectivity, effectively blocking infrared and ultraviolet rays and reducing indoor heat. The above structural layers can be bonded together under high temperature and high pressure using a hot-pressing process to form a sunshade film.

[0059] The results of the performance tests on the sunshade film are shown in the table below: Test Project Test methods Test Results Tensile strength GB / T 1040.3-2006 205MPa Nominal strain at tensile fracture GB / T 1040.3-2006 95% Puncture resistance ASTM F1306-21 126N Tear strength GB / T 16578.1-2008 3.51 kN / m 180° peel strength GB / T 2792-2014 Method 1 0.4 N / cm Light transmittance GB / T 2410-2008 Method A 76.5% The present invention also provides the application of the above-mentioned sunshade film on automotive windows or building windows. After peeling off the two protective layers, the adhesive layer of the sunshade film is pasted onto the inner wall of the glass window, which can prevent fogging on the inner wall of the window and thus affect the view of people inside the window.

[0060] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An anti-fog film, characterized in that: It includes a polymer matrix layer and an anti-fog coating, wherein the anti-fog coating is prepared on the surface of the polymer matrix layer; The anti-fog coating includes hydrophilic functional molecules; The anti-fog coating is chemically grafted onto the polymer matrix layer to obtain the anti-fog film.

2. The anti-fog film according to claim 1, characterized in that: The polymer matrix layer needs to be obtained through plasma treatment.

3. The anti-fog film according to claim 2, characterized in that: The polymer matrix layer is a polymer with active reactive groups produced by plasma treatment of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene, polyimide, and polyethylene.

4. The anti-fog film according to claim 1, characterized in that: The hydrophilic functional molecule is at least one of polyethylene glycol methacrylate and polyethylene glycol dimethacrylate.

5. A method for preparing the anti-fog film according to any one of claims 1-4, characterized in that: Includes the following steps: S1. The polymer matrix is ​​subjected to plasma treatment to introduce active reactive groups to obtain a polymer matrix layer; S2. Prepare a coating reaction solution containing hydrophilic functional molecules; S3. The coating reaction solution is applied to the surface of the polymer matrix layer, so that a chemical grafting reaction occurs between the surface of the polymer matrix layer and the coating reaction solution to obtain the anti-fog coating. The anti-fog coating and the polymer matrix layer are combined to form the anti-fog film.

6. The method for preparing the anti-fog film according to claim 5, characterized in that: In steps S2 and S3, a reaction solution and a coating solution are prepared respectively, with a volume ratio of 2:1 between the reaction solution and the coating solution. The coating solution includes 5-10% by mass of hydrophilic functional molecules and 1-2% by mass of photoinitiator. The reaction solution and the coating solution are stirred and mixed to obtain the coating reaction solution. When the polymer matrix layer is made of any one of polymethyl methacrylate, polyethylene terephthalate, polypropylene, or polyethylene, the reaction solution includes acrylic acid, ammonium persulfate, and sodium sulfite, and the mass fraction ratio of acrylic acid, ammonium persulfate, and sodium sulfite is 7.5~10.5%:0.3~1.2%:0.3~1.2%. The chemical grafting reaction temperature is 65~70℃, and then the surface of the polymer matrix layer is cleaned with deionized water. When the polymer matrix layer is made of polycarbonate, the reaction solution is 5% acryloyl chloride, the solvent of the reaction solution is toluene, the chemical grafting reaction temperature is room temperature, and then the surface of the polymer matrix layer is cleaned with toluene and ethanol. Wherein, when the polymer matrix layer is polypropylene, the solvent of the reaction solution is water; and when the polymer matrix layer is any one of polymethyl methacrylate, polyethylene terephthalate, or polyethylene, the solvent of the reaction solution includes ethanol. The drying temperature for the polymer matrix layer surface is 45~50℃, and the drying time is 8~12h.

7. The method for preparing the anti-fog film according to claim 6, characterized in that: In step S5, during the curing process, the surface of the polymer matrix layer is irradiated with an ultraviolet light source for 20-30 minutes.

8. The method for preparing the anti-fog film according to claim 5, characterized in that: The thickness of the polymer matrix layer is 40-50 micrometers, and the thickness of the anti-fog coating is 1-5 micrometers.

9. An application of the antifog film according to any one of claims 1-4, characterized in that, The anti-fog film has a protective layer on its anti-fog coating, and a solar energy blocking layer, a substrate layer and an adhesive layer are sequentially bonded to the polymer matrix layer of the anti-fog film. The adhesive layer also has a protective layer on its surface, thus obtaining a sunshade film.

10. The application of the sunshade film as described in claim 9 on automotive window glass or architectural window glass.