Silver-plated reflecting film and preparation method thereof

Abstract

The invention discloses a silver-plated reflecting film and a preparation method thereof, and belongs to the field of film plating. The silver-plated reflecting film comprises a film material, a bottom coating layer, a silver-plated layer and a surface coating layer which are arranged in sequence, the bottom coating layer is formed by curing a bottom coating agent, and the surface coating layer is formed by curing a surface coating agent; the primer comprises a first resin coating and a surface energy aid, and the surface energy aid comprises one or more of polyether macromonomer modified polyacrylate, polyether macromonomer and organic silicon macromolecule modified polyacrylate and polyether macromonomer and organic silicon micromolecule modified polyacrylate; the topcoat agent includes a second resin coating material, a resist, and inorganic nanoparticles. The application has the effects of further improving the adhesive force of the silver layer, thereby improving the optical performance and the service life of the silver-plated reflecting film.

Description

Technical Field

[0001] The present application relates to the field of film coating, and in particular to a silver-plated reflective film and a preparation method thereof. Background Art

[0002] Silver-coated reflective films have a wide range of applications, most notably in solar energy, lighting, and display technology. For example, silver-coated reflective films can be used as solar reflectors, reflecting sunlight onto solar panels. The film's high reflectivity increases the amount of light received by solar panels, improving photoelectric conversion efficiency.

[0003] Generally speaking, silver-plated reflective film is obtained by evaporating a silver layer on the surface of the film. Since the adhesion of silver deposited on plastic film materials such as PET is low, a primer is usually applied to the surface of the film before silver plating. The primer is usually a resin coating such as polyurethane or acrylate to promote the deposition of the silver layer.

[0004] However, in actual application, it was found that the adhesion improvement of the silver layer deposition by only using the above-mentioned resin coating as a primer was relatively limited, and interlayer peeling was prone to occur under bending or dynamic stress, resulting in degradation of optical performance. Summary of the Invention

[0005] In order to further improve the adhesion of the silver layer, the present application provides a silver-plated reflective film and a preparation method thereof.

[0006] In a first aspect, the present application provides a silver-plated reflective film using the following technical solutions: A silver-plated reflective film, comprising a film material, a primer layer, a silver-plated layer, and a topcoat layer arranged in sequence, wherein the primer layer is formed by curing a primer, and the topcoat layer is formed by curing a topcoat; The primer comprises a first resin coating and a surface energy additive, wherein the surface energy additive comprises one or more of polyether macromonomer-modified polyacrylate, polyether macromonomer-organic silicon macromolecule-modified polyacrylate, and polyether macromonomer-organic silicon small molecule-modified polyacrylate; The top coating agent comprises a second resin coating, a resist and inorganic nanoparticles.

[0007] By adopting the above technical solution, the primer contains a surface energy additive, polyacrylate provides excellent leveling performance, and the modification of the polyether macromonomer can increase the polar force part of the surface energy of the cured coating system, thereby increasing the surface energy. The surface energy can be increased to more than 50 dynes, which helps to promote the formation of a dense and uniform silver atomic deposition film during silver plating, thereby improving the reflectivity and uniformity. At the same time, the high surface energy also helps to increase the adhesion between the silver-plated layer and the primer layer, thereby improving the mechanical properties of the silver-plated reflective film.

[0008] The topcoat contains anti-corrosion agents and inorganic nanoparticles. The anti-corrosion agents form a passivation protective film with the surface atoms of the silver layer. The inorganic nanoparticles fill the tiny gaps in the topcoat to a certain extent, effectively blocking the passage of gas through the topcoat and reducing the reaction between silver atoms and external gases. Therefore, the environmental tolerance and service life of the silver-plated reflective film are improved through the joint action of multiple mechanisms.

[0009] Optionally, in the primer, the mass ratio of the first resin coating to the surface energy additive is 100:(1-5); optionally, in the topcoat, the mass ratio of the second resin coating, the anti-corrosion agent and the inorganic nanoparticles is 100:(0.1-2):(1-5).

[0010] By adopting the above technical solution, the required amount of surface energy additive, corrosion inhibitor and inorganic nanoparticles is small, especially the corrosion inhibitor has obvious protective effect even with a small amount of addition.

[0011] Optionally, the surface energy additive includes polyether macromonomer modified polyacrylate, polyether macromonomer and organosilicon macromonomer modified polyacrylate, and polyether macromonomer and organosilicon small molecule monomer modified polyacrylate in a mass ratio of 1: (0.2-0.3): (0.55-0.7).

[0012] By adopting the above technical solution, polyether macromolecular monomer modification is combined with silicone modification. The silicone modification creates appropriate incompatibility in the system, promotes the directional migration of the surface energy additive to the surface of the base coating, and drives the polyether macromolecular side chains to migrate to the air / liquid layer interface, thereby further improving the surface energy of the base coating, facilitating the adhesion of the silver-plated layer, and improving the optical properties, mechanical properties and service life of the silver-plated reflective film.

[0013] Optionally, the polyether macromonomer is a hyperbranched polyether; the organosilicon macromonomer is a hydrogenated silicone oil; and the organosilicon small molecule monomer is a silane coupling agent.

[0014] By adopting the above technical solution, the hyperbranched polyether has a macromolecular structure, which can improve fluidity and further improve the directional migration of the gas / liquid interface; the hydrogenated silicone oil has a macromolecular structure, and the silane coupling agent has a small molecular structure. The combination of the two silicone structures can keep the incompatibility in the system within an appropriate range and maintain the stability of the primer coating.

[0015] Optionally, the polyether macromonomer-modified polyacrylate is obtained by reacting trimethylolpropane tris-3-mercaptopropionate with epoxy acrylate and then reacting with polyacrylate having hydroxyl groups.

[0016] Optionally, the polyether macromonomer and silicone macromonomer modified polyacrylate is obtained by reacting trimethylolpropane tris-3-mercaptopropionate with epoxy acrylate, then reacting with hydrogenated silicone oil, and then reacting with polyacrylate with hydroxyl groups.

[0017] Optionally, the polyether macromonomer and the organosilicon small molecule monomer modified polyacrylate is obtained by reacting trimethylolpropane tris-3-mercaptopropionate with epoxy acrylate, then reacting with a silane coupling agent, and then reacting with a polyacrylate with a hydroxyl group.

[0018] Optionally, the resist comprises one or more of phosphites, polyphosphate thiosulfates and mercaptobenzothiazole derivatives.

[0019] By adopting the above technical solution, the above substances can be used as corrosion inhibitors, preferentially adsorbed on the active sites of silver, and chelated with silver to form a dense passivation film, effectively preventing corrosive media such as water, oxygen and sulfur from reacting with the surface of the silver layer.

[0020] Taking 1-phenyl-5-mercaptotetrazole as an example, the phenyl group in this resist is highly hydrophobic. Its two nitrogen atoms and one mercapto anion can coordinate with silver ions to form a dense complex film, Ag-PMTA, which can effectively prevent the corrosive medium from reacting with the silver surface.

[0021] Optionally, the inorganic nanoparticles include one or more of nano-titanium dioxide, nano-silicon dioxide, nano-zirconium dioxide, and nano-mica flakes.

[0022] By adopting the above technical solution, the above inorganic nanoparticles have a good filling effect and can be filled into the gaps inside the top coating, thereby improving the protective effect of the top coating on the silver-plated layer. In addition, the top coating enhances the stabilizing effect of the silver-plated layer and improves the structural stability of the silver-plated reflective film.

[0023] Optionally, the first resin coating and the second resin coating are one or more of polyurethane coating, acrylate coating and epoxy coating.

[0024] Optionally, the film material includes one of PET film, PBT film, PP film and PE film.

[0025] In a second aspect, the present application provides a method for preparing a silver-plated reflective film using the following technical solution: A method for preparing a silver-plated reflective film comprises the following steps: The primer is applied to the surface of the membrane material, dried and matured to obtain a primer layer; vacuum evaporating silver on the base coating to obtain a silver-plated layer; A top coating agent is applied on the silver-plated layer, dried and then aged to obtain a top coating layer, thereby completing the preparation of the silver-plated reflective film.

[0026] By adopting the above technical solution, the adhesion of the base coating to the silver-plated layer is improved after curing, and the uniformity of the silver-plated layer is smoother, which helps to improve the optical performance and service life of the silver-plated reflective film.

[0027] Optionally, the thickness of the silver plating layer is 80-90 nm, and the sheet resistance is 0.1-0.2 Ω / .

[0028] In summary, this application has the following beneficial effects: 1. The primer of the present application contains a surface energy additive. The polyacrylate provides excellent leveling performance, and the modification of the polyether macromonomer can increase the polar force portion of the surface energy of the cured coating system, thereby increasing the surface energy. The surface energy can be increased to more than 50 dynes, which helps to promote the formation of a dense and uniform silver atomic deposition film during silver plating, thereby improving the reflectivity and uniformity. At the same time, the high surface energy also helps to increase the adhesion between the silver-plated layer and the primer layer, thereby improving the mechanical properties of the silver-plated reflective film. The topcoat contains an anti-corrosion agent and inorganic nanoparticles. The anti-corrosion agent forms a passivation protective film with the surface atoms of the silver layer. The inorganic nanoparticles fill the tiny gaps in the topcoat layer to a certain extent, effectively hindering the passage of gas through the topcoat layer and reducing the reaction of silver atoms with external gases. Therefore, under the combined action of multiple mechanisms, the environmental tolerance and service life of the silver-plated reflective film are improved.

[0029] 2. On the basis of the modification of the polyether macromolecular monomer in the surface energy additive, the silicone modification is combined with the modification. The silicone modification creates appropriate incompatibility in the system, promotes the directional migration of the surface energy additive to the surface of the base coating, and drives the polyether macromolecular branch chain to migrate to the air / liquid layer interface, thereby further improving the surface energy of the base coating, which is beneficial to the adhesion of the silver-plated layer and improving the optical properties, mechanical properties and service life of the silver-plated reflective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional structural diagram of the silver-plated reflective film of the present application.

[0031] Description of reference numerals: 1. Film material; 2. Primer layer; 3. Silver plating layer; 4. Topcoat. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 This application is described in further detail.

[0033] Preparatory Example Preparation method of polyacrylate: Ethyl acrylate, methyl methacrylate and hydroxyethyl methacrylate were respectively taken in a molar ratio of 1:1.5:0.2, and benzoyl peroxide was taken at 4% of the total mass of the above three acrylates, and ethanol was taken at 2 times the total mass of the above three acrylates.

[0034] Under nitrogen protection, ethyl acrylate, methyl methacrylate, hydroxyethyl methacrylate and ethanol were stirred and mixed evenly, the temperature was raised to 65°C, and benzoyl peroxide was gradually added. The benzoyl peroxide was added over 30 minutes, and the reaction was stirred for 2 hours to obtain polyacrylate.

[0035] Preparation Example 1 Preparation method of polyether macromonomer modified polyacrylate: Trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were taken in a molar ratio of 1:1, and DBU catalyst was taken at 0.5% of the total mass of the above two raw materials, and then the polyacrylate prepared in the preparation example was taken at 2 times the total mass of the above two raw materials.

[0036] Under nitrogen protection, trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were dissolved in DMF solvent, and then DBU catalyst was added. After mixing evenly, the mixture was heated to 45°C and reacted for 3 hours. After the reaction was completed, the DMF solvent was removed by reduced pressure distillation to obtain a polyether macromonomer with a hyperbranched structure.

[0037] The DMP-30 accelerator is taken according to 1% of the total mass of the above polyether macromolecular monomer.

[0038] The polyether macromonomer, polyacrylate and DMP-30 accelerator were mixed, heated to 65° C., and stirred for reaction for 2 h to obtain the polyether macromonomer-modified polyacrylate.

[0039] Preparation Example 2 Preparation method of polyether macromonomer and silicone macromonomer modified polyacrylate: Trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were taken in a molar ratio of 1:1, and DBU catalyst was taken at 0.5% of the total mass of the above two raw materials, and then the polyacrylate prepared in the preparation example was taken at 2 times the total mass of the above two raw materials.

[0040] Under nitrogen protection, trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were dissolved in DMF solvent, and then DBU catalyst was added. After mixing evenly, the mixture was heated to 45°C and reacted for 3 hours. After the reaction was completed, the DMF solvent was removed by reduced pressure distillation to obtain a polyether macromonomer with a hyperbranched structure.

[0041] Hydrogenated silicone oil and chloroplatinic acid catalyst are taken according to 30% and 0.02% of the total mass of the above-mentioned polyether macromolecular monomer, respectively. The hydrogenated silicone oil has a molecular weight of 2000 and a hydrogen content of 1.2%.

[0042] The polyether macromonomer was mixed with hydrogenated silicone oil, chloroplatinic acid catalyst was added, and the mixture was heated to 85° C. and reacted for 5 h to obtain the organosilicon macromolecular grafted polyether macromonomer.

[0043] The DMP-30 accelerator is taken according to 1% of the total mass of the above-mentioned organosilicon macromolecular grafted polyether macromolecular monomer.

[0044] The organosilicon macromolecule grafted polyether macromonomer, polyacrylate and DMP-30 accelerator were mixed, heated to 65° C., and stirred for reaction for 2 hours to obtain polyether macromonomer and organosilicon macromonomer modified polyacrylate.

[0045] Preparation Example 3 Preparation method of polyacrylate modified with polyether macromonomer and organosilicon small molecule monomer: Trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were taken in a molar ratio of 1:1, and DBU catalyst was taken at 0.5% of the total mass of the above two raw materials, and then the polyacrylate prepared in the preparation example was taken at 2 times the total mass of the above two raw materials.

[0046] Under nitrogen protection, trimethylolpropane tris-3-mercaptopropionate and glycidyl methacrylate were dissolved in DMF solvent, and then DBU catalyst was added. After mixing evenly, the mixture was heated to 45°C and reacted for 3 hours. After the reaction was completed, the DMF solvent was removed by reduced pressure distillation to obtain a polyether macromonomer with a hyperbranched structure.

[0047] γ-aminopropyltriethoxysilane was taken according to 10% of the total mass of the polyether macromonomer, and DMP-30 accelerator was taken according to 1% of the total mass of the polyether macromonomer.

[0048] γ-Aminopropyltriethoxysilane was added to polyacrylate, the temperature was raised to 65°C, and the reaction was continued with stirring for 1 hour. Then, polyether macromonomer and DMP-30 accelerator were added and mixed, and the reaction was continued with stirring for 2 hours to obtain polyether macromonomer and silicone small molecule monomer modified polyacrylate.

[0049] Example 1 A method for preparing a silver-plated reflective film comprises the following steps: The first resin coating and the surface energy additive are evenly mixed to obtain a primer. The mass ratio of the first resin coating and the surface energy additive is 100:1. The first resin coating can be made of PET coating water-based polyurethane resin produced by Guoshibang Company, brand GSB-DT-H3, and the surface energy additive is the polyether macromolecular monomer modified polyacrylate obtained in Preparation Example 1.

[0050] The second resin coating is evenly mixed with the resist and the inorganic nanoparticles to obtain a topcoat. The mass ratio of the second resin coating, the resist and the inorganic nanoparticles is 100:0.1:1. The second resin coating can be made of the water-based polyurethane varnish of Wengkaier Company, with the brand PUD-107A. The resist can be made of 1-phenyl-5-mercaptotetrazole. The inorganic nanoparticles can be made of nano-silica with a particle size of 60 to 80 nm.

[0051] The primer is coated on the surface of the film material 1, which is specifically a PET film with a wet film thickness of 3 μm. The film is dried at 100° C. for 20 seconds and then aged at 60° C. for 48 hours to obtain the primer layer 2.

[0052] Silver is vacuum-deposited on the primer layer 2, with a vacuum degree required to be below 3E-3Pa, to obtain a silver-plated layer 3. The silver-plated layer 3 has a thickness of 80 to 90 nm and a sheet resistance of 0.1 to 0.2 Ω / .

[0053] A topcoat was applied on the silver-plated layer 3 with a wet film thickness of 3 μm, dried at 100° C. for 20 seconds, and then aged at 60° C. for 48 hours to obtain a topcoat layer 4, thereby completing the preparation of the silver-plated reflective film.

[0054] Example 2 A method for preparing a silver-plated reflective film comprises the following steps: The first resin coating and the surface energy additive are evenly mixed to obtain a primer. The mass ratio of the first resin coating and the surface energy additive is 100:5. The first resin coating can be made of PET coating water-based polyurethane resin produced by Guoshibang Company, brand GSB-DT-H3, and the surface energy additive is the polyether macromolecular monomer modified polyacrylate obtained in Preparation Example 1.

[0055] The second resin coating is evenly mixed with the anti-corrosion agent and the inorganic nanoparticles to obtain a top coating agent. The mass ratio of the second resin coating, the anti-corrosion agent and the inorganic nanoparticles is 100:2:5. The second resin coating can be made of the water-based polyurethane varnish of Wengkaier Company, with the brand PUD-107A. The anti-corrosion agent can be made of 1-phenyl-5-mercaptotetrazole. The inorganic nanoparticles can be made of nano-silica with a particle size of 60 to 80 nm.

[0056] The primer is coated on the surface of the film material 1, which is specifically a PET film with a wet film thickness of 3 μm. The film is dried at 100° C. for 20 seconds and then aged at 60° C. for 48 hours to obtain the primer layer 2.

[0057] Silver is vacuum-deposited on the primer layer 2, with a vacuum degree required to be below 3E-3Pa, to obtain a silver-plated layer 3. The silver-plated layer 3 has a thickness of 80 to 90 nm and a sheet resistance of 0.1 to 0.2 Ω / .

[0058] The top coating agent is applied on the silver-plated layer 3 with a wet film thickness of 3 μm, dried at 100°C for 20 seconds, and then aged at 60°C for 48 hours to obtain the top coating layer 4, thus completing the preparation of the silver-plated reflective film. Figure 1 shown.

[0059] Example 3 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the surface energy additive is the polyether macromonomer and silicone macromonomer-modified polyacrylate prepared in Preparation Example 2.

[0060] Example 4 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the surface energy additive is a polyacrylate modified with a polyether macromolecular monomer and a silicone small molecule monomer obtained in Preparation Example 3.

[0061] Example 5 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the surface energy additive is a compound of the polyether macromonomer and silicone macromonomer-modified polyacrylate of Preparation Example 2 and the polyether macromonomer and silicone small molecule monomer-modified polyacrylate of Preparation Example 3 in a mass ratio of 2:7.

[0062] Example 6 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the surface energy additive is a compound of the polyether macromonomer-modified polyacrylate of Preparation Example 1, the polyether macromonomer-and silicone macromonomer-modified polyacrylate of Preparation Example 2, and the polyether macromonomer-and silicone small molecule monomer-modified polyacrylate of Preparation Example 3 in a mass ratio of 1:0.2:0.7.

[0063] Example 7 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the surface energy additive is a compound of the polyether macromonomer-modified polyacrylate of Preparation Example 1, the polyether macromonomer-and silicone macromonomer-modified polyacrylate of Preparation Example 2, and the polyether macromonomer-and silicone small molecule monomer-modified polyacrylate of Preparation Example 3 in a mass ratio of 1:0.3:0.55.

[0064] Comparative Example 1 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the primer does not contain a surface energy additive.

[0065] Comparative Example 2 A method for preparing a silver-plated reflective film, which differs from Example 1 in that the topcoat does not contain inorganic nanoparticles.

[0066] Performance Testing Average reflectivity: Take a silver-coated reflective film sample with a 5-inch screen as the size, and evenly select 9 points on the sample. Test the reflectivity of these 9 points at a wavelength of 550nm, and take the average value as the result. The test equipment is TS20 spectrocolorimeter.

[0067] Reflection uniformity: The reflectivity of the 9 points measured above is calculated according to the standard deviation method to calculate the uniformity. The specific standard deviation formula is: σ=√[∑(Ti-Mean) 2 / N] where σ represents the degree of dispersion of data distribution, i.e., standard deviation; N is the total number of data points; Ti is the The reflectance value of i data points; Mean is the average of all data points. This formula quantifies the degree of data dispersion by calculating the average of the sum of squares of the differences between the data points and the mean, thereby assessing the uniformity of the data.

[0068] Bending cycle: Cut the silver-plated film into 15mm×100mm and test it using PY-D608D flexible material folding life tester. Set the parameters as bending radius 3mm, frequency 0.5Hz, bending angle 90°, and record the number of life cycles.

[0069] Humidity and heat resistance test: Take a 5-inch screen silver-coated reflective film sample and place it in a constant temperature chamber at 65°C and 95% RH for 240 hours. After removing the sample, let it equilibrate at room temperature for 24 hours. Calculate the difference in average reflectivity (ΔR) at nine points before and after the humidity and heat resistance test. The average reflectivity test method is the same as above.

[0070] The above test results are shown in Table 1.

[0071] Table 1 As shown in Table 1, compared with the primer without the surface energy additive, the primer with the surface energy additive makes the silver-plated reflective film have higher average reflectivity and reflection uniformity, showing good optical properties, better resistance to bending cycles, and better resistance to humidity and heat, proving that the environmental tolerance and service life of the silver-plated reflective film are improved.

[0072] Further comparison between Example 1 and Examples 3-4 shows that compared with a single modified polyacrylate, the surface energy additive can improve the optical properties, environmental tolerance and service life of the silver-plated reflective film when using polyether macromonomer modified polyacrylate, polyether macromonomer and silicone macromolecule modified polyacrylate, and polyether macromonomer and silicone small molecule modified polyacrylate.

[0073] By comparing Examples 1-5 with Examples 6-7, it can be seen that the surface energy additives using polyether macromonomer modified polyacrylate, polyether macromonomer and silicone macromolecule modified polyacrylate, and polyether macromonomer and silicone small molecule modified polyacrylate can further improve the environmental tolerance and bending resistance of the silver-plated reflective film, and have better overall performance.

[0074] In addition, compared with the top coating agent that does not contain inorganic nanoparticles, the top coating agent with added inorganic nanoparticles greatly improves the moisture and heat resistance of the silver-plated reflective film, which helps to improve the environmental tolerance and service life of the silver-plated reflective film.

[0075] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A silver-plated reflective film, characterized in that: The method comprises a film material, a primer layer, a silver-plated layer and a top coat layer which are arranged in sequence, wherein the primer layer is formed by curing a primer, and the top coat layer is formed by curing a top coat; The primer comprises a first resin coating and a surface energy additive, wherein the surface energy additive comprises one or more of polyether macromonomer-modified polyacrylate, polyether macromonomer-organic silicon macromolecule-modified polyacrylate, and polyether macromonomer-organic silicon small molecule-modified polyacrylate; The top coating agent comprises a second resin coating, a resist and inorganic nanoparticles.

2. The silver-plated reflective film according to claim 1, wherein: In the primer, the mass ratio of the first resin coating to the surface energy additive is 100:(1-5); In the top coating agent, the mass ratio of the second resin coating, the anti-corrosion agent and the inorganic nanoparticles is 100:(0.1-2):(1-5).

3. The silver-plated reflective film according to claim 1, wherein: The surface energy additive includes polyether macromonomer modified polyacrylate, polyether macromonomer and organosilicon macromonomer modified polyacrylate, and polyether macromonomer and organosilicon small molecule monomer modified polyacrylate, which are compounded in a mass ratio of 1:(0.2-0.3):(0.55-0.7).

4. The silver-plated reflective film according to claim 3, wherein: The polyether macromonomer is a hyperbranched polyether; the organosilicon macromonomer is a hydrogenated silicone oil; and the organosilicon micromonomer is a silane coupling agent.

5. The silver-plated reflective film according to claim 1, wherein: The resist includes one or more of phosphites, polyphosphate thiosulfates and mercaptobenzothiazole derivatives.

6. The silver-plated reflective film according to claim 1, characterized in that: The inorganic nanoparticles include one or more of nano-titanium dioxide, nano-silicon dioxide, nano-zirconium dioxide, and nano-mica sheets.

7. The silver-plated reflective film according to claim 1, wherein: The first resin coating and the second resin coating are one or more of polyurethane coating, acrylate coating and epoxy coating.

8. The silver-plated reflective film according to claim 1, characterized in that: The film material includes one of PET film, PBT film, PP film and PE film.

9. A method for preparing a silver-plated reflective film according to any one of claims 1 to 8, characterized in that: The following steps are involved: The primer is applied to the surface of the membrane material, dried and matured to obtain a primer layer; vacuum evaporating silver on the base coating to obtain a silver-plated layer; A top coating agent is applied on the silver-plated layer, dried and then aged to obtain a top coating layer, thereby completing the preparation of the silver-plated reflective film.

10. The method for preparing a silver-plated reflective film according to claim 9, wherein: The thickness of the silver plating layer is 80-90 nm, and the sheet resistance is 0.1-0.2 Ω / .

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