A radiation-shielding solar cell front panel and its preparation method

Abstract

This application discloses a radiation-resistant solar cell front panel, comprising at least a radiation-resistant coating applied to the outermost layer of a fluorocarbon resin protective film, which is formed by bonding a PET film and a fluorocarbon resin protective film together with an adhesive layer. This application also discloses a method for preparing the aforementioned radiation-resistant solar cell front panel. The radiation-resistant solar cell front panel of this application, by coating the outermost layer of the front panel with a radiation-resistant coating and employing a combination of ultraviolet light curing and thermal curing processes, along with the use of composite ultraviolet light absorbers, achieves excellent radiation-resistant performance while also possessing good uniformity and visible light transmittance.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a solar cell front panel made of polymer composite materials, especially a radiation-resistant solar cell front panel and its preparation method. Background Technology

[0002] Photovoltaic modules typically consist of a front panel, encapsulation materials, solar cells, and a backsheet. The backsheet protects the solar cells from moisture corrosion and prevents internal oxidation, requiring reliable insulation, water resistance, aging resistance, high and low temperature resistance, and corrosion resistance. Front panels are mostly made of glass due to its high strength and good light transmittance. However, glass front panels have disadvantages such as being heavy and unable to withstand significant bending. Polymer materials are increasingly gaining attention as alternatives to glass for front panels. Existing polymer composite front panels are generally transparent, made by combining fluorocarbon resin and a PET base film.

[0003] The polymer composite front panel has a similar structure to the multi-layered back panel, so most technicians generally assume that the front panel is made of glass or that the front panel and back panel are the same. Therefore, few people pay attention to the problems that the front panel needs to address. Generally speaking, the back panel is located on the back of the solar panel and mainly serves a supporting function. It does not have high requirements for light transmittance, and because it is not exposed to direct sunlight, it is far less affected by solar radiation than the front panel.

[0004] CN 203134840 U discloses a radiation-resistant double-glass solar cell module, including a backsheet glass located below the solar cells, wherein a radiation-resistant film is provided on the backsheet glass. This prior art addresses the problem of low ultraviolet (UV) blocking rate of the glass backsheet in double-glass solar cell modules. The radiation-resistant film used is a 10-layer coated nano-metal film, with a UV blocking rate greater than 65% and a visible light transmittance of not less than 75%. Clearly, if this radiation-resistant film were applied to the front panel, the power generation efficiency of the solar cell would directly decrease by about 25%. Therefore, radiation-resistant metal films are not suitable for use on the front panel of solar cells where light transmission is a fundamental function.

[0005] CN 106952978 A discloses a photovoltaic module, including a silicon wafer cell. A three-layer PET composite film is encapsulated on the upper and lower surfaces of the silicon wafer cell. A backsheet is provided above the upper PET composite film and below the lower PET composite film. A reflective layer is provided above the backsheet above the upper PET composite film and below the backsheet below the lower PET composite film. Photovoltaic glass is provided above the reflective layer above the backsheet and below the reflective layer below the backsheet. The outer surface of the photovoltaic glass is covered with a radiation-resistant metal film. This prior art sets reflective layers on both sides of the cell, preventing sunlight from reaching the cell. Although a radiation-resistant metal film is provided on the outer surface, the attenuation effect of the metal film on different wavelengths of light is not significantly different, thus reducing the power generation efficiency of the solar cell while providing radiation protection.

[0006] CN 112812695 B A sealing film for use in photovoltaic modules, comprising the following raw material components: a matrix resin, a crosslinking agent, a co-crosslinking agent, a silane coupling agent, and a light stabilizer; the co-crosslinking agent comprises a combination of isocyanate co-crosslinking agents and acrylate co-crosslinking agents. The preparation method of the sealing film comprises the following steps: mixing the matrix resin, crosslinking agent, co-crosslinking agent, silane coupling agent, and light stabilizer, along with optional fillers, photoinitiators, silane coupling agents, ultraviolet light absorbers, and anti-PID additives, and extruding to obtain the sealing film. The ultraviolet light absorber is selected from any one or a combination of at least two of UV-326, UV-327, UV-328, UV-329, UV-360, UV-P, UV-234, UV-1130, UV-384-2, UV-928, UV-400, UV-1577, UV-1164, or UV-531. The existing encapsulation film is a layer containing an ultraviolet absorber between the glass front panel and back panel, intended to encapsulate the solar cells. However, the ultraviolet light absorbed by this encapsulation structure obviously penetrates the front panel. If the front panel uses a polymer composite film, the polymer film in the front panel will be affected by ultraviolet light and will not provide radiation protection for the front panel.

[0007] CN 102867872 B discloses a POE-containing solar cell backsheet and its preparation method. The backsheet includes a weather-resistant layer, an adhesive layer, a structural reinforcement layer, and a POE film layer. The components of the POE film layer are: POE, POE-grafted maleic anhydride copolymer, an initiator, an ultraviolet absorber, an ultraviolet stabilizer, and an antioxidant. The ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, or 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole. This prior art addresses the issue of ultraviolet protection for the backsheet, without considering the problem of high-dose ultraviolet radiation or light transmittance. Furthermore, the adhesive layer and structural reinforcement layer on the outer side of the film containing the ultraviolet absorber are not protected. Summary of the Invention

[0008] The technical problem to be solved by this application is to provide a radiation-resistant solar cell front panel and its preparation method, so as to reduce or avoid the problems mentioned above.

[0009] To address the aforementioned technical problems, this application proposes a radiation-shielding solar cell front panel, comprising at least a PET film, wherein the PET film is bonded to a fluorocarbon resin protective film via an adhesive layer; wherein a radiation-shielding coating is disposed on the outer side of the fluorocarbon resin protective film, the radiation-shielding coating being formed by curing a radiation-shielding coating liquid composed of the following components in parts by weight: 20-40 parts by weight of ethylene-vinyl acetate copolymer resin, 20-40 parts by weight of polybutadiene polyurethane, and 100-180 parts by weight of... The composition includes a polyacrylate resin, 10-30 parts by weight of dimethyl sulfoxide, 4-8 parts by weight of a composite ultraviolet absorber, 25-45 parts by weight of a dipentaerythritol penta-hexaacrylate active monomer, and 0.4-0.8 parts by weight of an initiator of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; the composite ultraviolet absorber is composed of 50 wt% of modified 2-hydroxy-4-methoxybenzophenone and 50 wt% of 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole.

[0010] This application also proposes a method for preparing the above-mentioned radiation-resistant solar cell backsheet, comprising the following steps: applying a radiation-resistant coating liquid to the outermost side of a fluorocarbon resin protective film, which is a film layer consisting of a PET film and a fluorocarbon resin protective film bonded together by an adhesive layer; irradiating the bonded PET film and fluorocarbon resin protective film with ultraviolet light for 30-120 seconds; then heating to 75-85℃ for further curing for 180-300 seconds; then cooling to 55-60℃ and holding for 300 seconds, and naturally cooling to room temperature to obtain a radiation-resistant solar cell frontsheet.

[0011] Preferably, the preparation method further includes the step of preparing a radiation-shielding coating liquid: mixing 20-40 parts by weight of ethylene-vinyl acetate copolymer resin and 20-40 parts by weight of polybutadiene polyurethane, adding 10-30 parts by weight of dimethyl sulfoxide, and stirring at 200-300 rpm for 30-60 minutes to obtain a first mixture; mixing 100-180 parts by weight of polyacrylate resin and 25-45 parts by weight of dipentaerythritol penta-hexaacrylate active monomer and stirring at 200-300 rpm for 30-60 minutes to obtain a second mixture; adding the first and second mixtures to a reaction vessel, then adding 4-8 parts by weight of a composite ultraviolet absorber and 0.4-0.8 parts by weight of an initiator, and mixing at 1500-2000 rpm for 30-60 minutes to prepare the radiation-shielding coating liquid.

[0012] Preferably, the preparation method further includes the step of uniformly mixing modified 2-hydroxy-4-methoxybenzophenone and 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole in a weight ratio of 1:1 to prepare a composite ultraviolet absorber.

[0013] Preferably, the preparation method further includes a step of surface modification of 2-hydroxy-4-methoxybenzophenone, comprising: fully dissolving 2-hydroxy-4-methoxybenzophenone in ethanol to form a dissolved mixture, then adding the dissolved mixture to a polyvinyl alcohol aqueous solution and stirring continuously for 60-120 minutes to fully disperse; then adding sodium tripolyphosphate and stirring for another 60-120 minutes to fully mix and obtain a dispersed mixture; subjecting the dispersed mixture to lyophilization spray to obtain a surface-modified solid particle mixture; adding the obtained solid particle mixture to water for multiple washing and filtration to obtain a dispersion with a solid content of 20-40 wt% free of soluble matter; and subjecting the dispersion to lyophilization spray again to obtain modified 2-hydroxy-4-methoxybenzophenone.

[0014] Further, the step of surface modification of 2-hydroxy-4-methoxybenzophenone includes: dissolving 450-500 parts by weight of 2-hydroxy-4-methoxybenzophenone in ethanol to form a solution mixture; then adding the solution mixture to a polyvinyl alcohol aqueous solution with a content of 10wt%-15wt% and stirring continuously for 60-120 minutes to fully disperse; then adding 100-250 parts by weight of sodium tripolyphosphate and stirring for another 60-120 minutes to fully mix and obtain a dispersion mixture; lyophilizing the dispersion mixture to obtain a surface-modified solid particle mixture; washing and filtering the obtained solid particle mixture in water multiple times to obtain a dispersion with a solid content of 20-40wt% free of soluble matter; and lyophilizing the dispersion mixture again to obtain modified 2-hydroxy-4-methoxybenzophenone.

[0015] The radiation-resistant solar cell front panel of this application achieves excellent radiation protection performance by coating the outermost layer of the front panel with a radiation-resistant coating and using a combination of ultraviolet light curing and thermal curing processes, along with the use of composite ultraviolet light absorbers. It also exhibits good uniformity and visible light transmittance. Attached Figure Description

[0016] The accompanying drawings are intended only to illustrate and explain this application and do not limit the scope of this application.

[0017] Figure 1 The diagram shown is a schematic representation of the structure of a radiation-shielded solar cell front panel according to a specific embodiment of this application. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments are now described with reference to the accompanying drawings. Identical components are denoted by the same reference numerals.

[0019] To address the radiation protection problem of solar cell front panels described in the background art, this application proposes a radiation-resistant solar cell front panel. This front panel includes at least a PET film 10, which is bonded to a fluorocarbon resin protective film 30 via an adhesive layer 20. The fluorocarbon resin protective film 30 faces the sun and provides excellent barrier properties and weather resistance. The PET film 10 provides the supporting framework for the entire front panel. A weather-resistant coating or a protective layer can be further applied to the inner side of the PET film 10. The fluorocarbon resin includes, but is not limited to, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (FEVE), and / or polyvinyl fluoride (PVF).

[0020] Furthermore, a radiation-shielding coating 40 is further provided on the outer side of the fluorocarbon resin protective film 30. The radiation-shielding coating 40 is formed by curing a radiation-shielding coating liquid composed of the following components in parts by weight: 20-40 parts by weight of ethylene-vinyl acetate copolymer resin, 20-40 parts by weight of polybutadiene polyurethane, 100-180 parts by weight of polyacrylate resin, 10-30 parts by weight of dimethyl sulfoxide, 4-8 parts by weight of a composite ultraviolet absorber, 25-45 parts by weight of dipentaerythritol penta-hexaacrylate active monomer, and 0.4-0.8 parts by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide initiator. The composite ultraviolet absorber is composed of 50 wt% modified 2-hydroxy-4-methoxybenzophenone and 50 wt% 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole.

[0021] Furthermore, the radiation-shielding coating liquid of this application can be prepared by the following method, which includes the following steps: mixing 20-40 parts by weight of ethylene-vinyl acetate copolymer resin and 20-40 parts by weight of polybutadiene polyurethane, adding 10-30 parts by weight of dimethyl sulfoxide, and stirring at 200-300 rpm for 30-60 minutes to obtain a first mixture. Mixing 100-180 parts by weight of polyacrylate resin and 25-45 parts by weight of dipentaerythritol penta-hexaacrylate active monomer, and stirring at 200-300 rpm for 30-60 minutes to obtain a second mixture. Adding the first and second mixtures to a reaction vessel, then adding 4-8 parts by weight of composite ultraviolet absorber and 0.4-0.8 parts by weight of initiator, and mixing at 1500-2000 rpm for 30-60 minutes to prepare the radiation-shielding coating liquid of this application.

[0022] As previously stated, the composite ultraviolet absorber is composed of modified 2-hydroxy-4-methoxybenzophenone and 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole in a 1:1 weight ratio. The modified 2-hydroxy-4-methoxybenzophenone is a surface-modified 10-20 nm particulate matter. The composite ultraviolet absorber of this application exhibits absorption effects in the UVA band, effectively quenching the energy of excited-state polymers and strongly absorbing ultraviolet light in the wavelength range of 280–380 nm.

[0023] In one specific embodiment of this application, the steps for surface modification of 2-hydroxy-4-methoxybenzophenone are as follows: 2-hydroxy-4-methoxybenzophenone is fully dissolved in ethanol to form a solution mixture; then, the solution mixture is added to a polyvinyl alcohol aqueous solution and stirred continuously for 60-120 minutes to fully disperse; then, sodium tripolyphosphate is added and stirred for another 60-120 minutes to fully mix and obtain a dispersion mixture; the dispersion mixture is lyophilized by spray drying to obtain a surface-modified solid particle mixture; the obtained solid particle mixture is washed and filtered multiple times in clean water to obtain a dispersion with a solid content of 20-40 wt% free of soluble matter; the dispersion is then lyophilized again by spray drying to obtain modified 2-hydroxy-4-methoxybenzophenone. The polyvinyl alcohol content in the polyvinyl alcohol aqueous solution is 10 wt%-15 wt%.

[0024] Example 1

[0025] 500 parts by weight of 2-hydroxy-4-methoxybenzophenone were dissolved in 2500 parts by weight of ethanol to obtain a dissolved mixture. The dissolved mixture was added to 30000 parts by weight of a polyvinyl alcohol aqueous solution (the polyvinyl alcohol content in the aqueous solution was 10 wt%), and stirred continuously for 60 minutes. Then, 250 parts by weight of sodium tripolyphosphate were added, and stirring was continued for 60 minutes to obtain a dispersed mixture. Finally, the dispersed mixture was lyophilized by spray drying to obtain a surface-modified solid particle mixture. The obtained solid particle mixture was washed and filtered multiple times with water to obtain a dispersion with a solid content of 20 wt% free of soluble matter. The dispersion was lyophilized again by spray drying, and particles with a particle size of 10 nm were screened to obtain the modified 2-hydroxy-4-methoxybenzophenone. The obtained modified 2-hydroxy-4-methoxybenzophenone was uniformly mixed with 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole at a weight ratio of 1:1 to prepare a composite ultraviolet absorber.

[0026] Comparative Example 1

[0027] 2-Hydroxy-4-methoxybenzophenone was used directly as an ultraviolet absorber without modification, and 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole was not added.

[0028] Example 2

[0029] 450 parts by weight of 2-hydroxy-4-methoxybenzophenone were dissolved in 2000 parts by weight of ethanol to obtain a dissolved mixture. The dissolved mixture was added to 25000 parts by weight of a polyvinyl alcohol aqueous solution (polyvinyl alcohol content of 15 wt%), and stirred continuously for 120 minutes. Then, 100 parts by weight of sodium tripolyphosphate were added, and stirring was continued for 120 minutes to obtain a dispersed mixture. Finally, the dispersed mixture was lyophilized by spray drying to obtain a surface-modified solid particle mixture. The obtained solid particle mixture was washed and filtered multiple times in water to obtain a dispersion with a solid content of 40 wt% free of soluble matter. The dispersion was lyophilized again by spray drying, and particles with a particle size of 20 nm were screened to obtain the modified 2-hydroxy-4-methoxybenzophenone. The obtained modified 2-hydroxy-4-methoxybenzophenone was uniformly mixed with 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole at a weight ratio of 1:1 to prepare a composite ultraviolet absorber.

[0030] Comparative Example 2

[0031] 2-(2′-hydroxy-5′-tert-octylphenyl)-benzotriazole was used directly as an ultraviolet light absorber without the addition of modified 2-hydroxy-4-methoxybenzophenone.

[0032] Examples 3-5

[0033] Prepare radiation-shielding coating solutions according to the raw material mass fractions and parameters in the table below, following the methods described above.

[0034] Example 3 Example 4 Example 5 Ethylene-vinyl acetate copolymer resin 20 30 40 Polybutadiene polyurethane 20 30 40 dimethyl sulfoxide 10 20 30 Polyacrylate resin 100 140 180 Dipentaerythritol pentahexaacrylate 25 35 45 Composite UV absorber 4 6 8 Initiator 0.4 0.6 0.8

[0035] In Example 3 and Example 5, the composite ultraviolet light absorber prepared in Example 1 was used, and in Example 4, the composite ultraviolet light absorber prepared in Example 2 was used.

[0036] Comparative Examples 3-5

[0037] According to the method of the above embodiments, a comparative radiation-shielding coating liquid was prepared according to the raw material mass parts and parameters in the table below.

[0038] Comparative Example 3 Comparative Example 4 Comparative Example 5 Ethylene-vinyl acetate copolymer resin 20 0 40 Polybutadiene polyurethane 20 30 0 dimethyl sulfoxide 0 20 30 Polyacrylate resin 100 140 180 Dipentaerythritol pentahexaacrylate 25 35 45 UV absorber 4 6 8 Initiator 0.4 0.6 0.8

[0039] Comparative Examples 3 and 5 used the UV absorber of Comparative Example 1, while Comparative Example 4 used the UV absorber of Comparative Example 2.

[0040] The radiation-shielding coating liquids of Examples 3-5 and Comparative Examples 3-5 were respectively coated on the outermost side of the fluorocarbon resin protective film 30, which is a film layer consisting of a PET film 10 and a fluorocarbon resin protective film 30 bonded together by an adhesive layer 20. The bonded PET film 10 and fluorocarbon resin protective film 30 were irradiated with ultraviolet light for 30-120 seconds; then the temperature was raised to 75-85°C for further curing for 180-300 seconds; then the temperature was lowered to 55-60°C and held for 300 seconds, and then allowed to cool naturally to room temperature to obtain a radiation-shielding solar cell front panel. In this application, rapid pre-curing is first performed at room temperature using ultraviolet light, followed by temperature-increased curing. During the temperature-increased curing, the stress generated during the pre-curing process is released. After temperature-increased curing, heat preservation annealing is performed to reduce stress concentration during bonding and prevent warping and deformation of the film layer.

[0041] Among them, the PET film 10 is a biaxially oriented PET film with a thickness of 100-200μm, the fluorocarbon resin protective film 30 is a PVDF film with a thickness of 10-20μm, and the adhesive layer 20 is cured with commercially available transparent EVA adhesive with a thickness of 3-5μm.

[0042] The prepared front panel was subjected to an accelerated aging test at 120°C for 48 hours, with a humidity of 100%. The visible light transmittance (%) and the transmittance of ultraviolet light at different wavelengths (%) were also tested. The test results are shown in the table below.

[0043] 280nm 320nm 340nm 380nm Visible light transmittance Example 3 <5 <5 <5 <5 91 Example 4 <5 <5 <5 <5 92 Example 5 <5 <5 <5 <5 93 Comparative Example 3 >10 >10 >10 >10 82 Comparative Example 4 >10 >10 >10 >10 92 Comparative Example 5 >10 >10 >10 >10 83

[0044] The results show that the radiation-shielded solar cell front panel of this application has both excellent visible light transmittance and good radiation protection performance.

[0045] Furthermore, the prepared radiation-shielded solar cell front panel was divided into regions, and films from different regions were cut out to test the consistency of the films. The tests showed that the performance differences of each film in Examples 3-5 were all less than 3%, while the performance differences of each film in Comparative Examples 3-5 were relatively large, at 15%, 3%, and 12%, respectively. The results indicate that the radiation-shielded solar cell front panel of this application has excellent ultraviolet light absorption performance and good uniformity, indicating that the ultraviolet light absorption components of this invention have good dispersion.

[0046] Those skilled in the art should understand that although this application is described by way of multiple embodiments, not every embodiment contains only one independent technical solution. This description is merely for clarity, and those skilled in the art should understand the specification as a whole and consider the technical solutions involved in each embodiment as being able to be combined with each other to form different embodiments to understand the scope of protection of this application.

[0047] The above description is merely an illustrative embodiment of this application and is not intended to limit the scope of this application. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this application shall fall within the scope of protection of this application.

Claims

1. A radiation-proof front plate for a solar cell, comprising at least a PET film (10) which is bonded to a fluorocarbon resin protective film (30) by means of an adhesive layer (20); characterized in that, The fluorocarbon resin protective film (30) is provided with a layer of radiation protection coating (40) on the outer side, which is formed by curing a radiation protection coating liquid consisting of the following components in parts by weight: 20-40 parts by weight of ethylene-vinyl acetate copolymer resin, 20-40 parts by weight of polybutadiene polyurethane, 100-180 parts by weight of polyacrylate resin, 10-30 parts by weight of dimethyl sulfoxide, 4-8 parts by weight of composite ultraviolet light absorber, 25-45 parts by weight of dipentaerythritol penta- or hexa-acrylate active monomer, 0.4-0.8 parts by weight of initiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide; the composite ultraviolet light absorber consists of 50 wt% of modified 2-hydroxy-4-methoxybenzophenone and 50 wt% of 2-(2'-hydroxy-5'-tert-octylphenyl)-benzotriazole; the modified 2-hydroxy-4-methoxybenzophenone is obtained by modifying the following steps: 2-hydroxy-4-methoxybenzophenone is fully dissolved in ethanol to form a dissolution mixture, then the dissolution mixture is added to an aqueous polyvinyl alcohol solution, and stirring is continued for 60-120 minutes for sufficient dispersion; then sodium tripolyphosphate is added and stirring is continued for 60-120 minutes for sufficient mixing to obtain a dispersion mixture; the dispersion mixture is subjected to freeze-drying spray to obtain a surface-modified solid particle mixture; the obtained solid particle mixture is added to clean water and washed and filtered multiple times to obtain a dispersion liquid with a solid content of 20-40 wt% without soluble substances, and the dispersion liquid is again subjected to freeze-drying spray to obtain modified 2-hydroxy-4-methoxybenzophenone.

2. A method for preparing a radiation-proof solar cell front plate according to claim 1, comprising the following steps: applying a radiation-proof coating liquid to the outermost side of the fluorocarbon resin protective film (30) of the film layer formed by bonding the PET film (10) and the fluorocarbon resin protective film (30) into one body through the adhesive layer (20), and irradiating the bonded PET film (10) and fluorocarbon resin protective film (30) with ultraviolet light for 30-120 seconds; then heating to 75-85°C for further curing for 180-300 seconds; then cooling to 55-60°C for 300 seconds, and naturally cooling to room temperature to prepare a radiation-proof solar cell front plate.

3. The production method according to claim 2, characterized by, Further comprising the step of preparing the anti-radiation coating liquid: mixing 20-40 parts by weight of ethylene-vinyl acetate copolymer resin and 20-40 parts by weight of polybutadiene polyurethane, adding 10-30 parts by weight of dimethyl sulfoxide, stirring at a speed of 200-300 rpm for 30-60 minutes to obtain a first mixed liquid; mixing 100-180 parts by weight of polyacrylate resin with 25-45 parts by weight of dipentaerythritol penta-hexa acrylate active monomer and stirring at a speed of 200-300 rpm for 30-60 minutes to obtain a second mixed liquid; adding the first mixed liquid and the second mixed liquid to a reaction kettle, then adding 4-8 parts by weight of the composite ultraviolet light absorber and 0.4-0.8 parts by weight of the initiator, mixing at a speed of 1500-2000 rpm for 30-60 minutes to obtain the anti-radiation coating liquid.

4. The production method according to claim 3, wherein Further comprising the step of preparing the composite ultraviolet light absorber by uniformly mixing the modified 2-hydroxy-4-methoxybenzophenone and 2-(2'-hydroxy-5'-tert-octylphenyl)-benzotriazole at a weight ratio of 1:

1. Further comprising the step of preparing the composite ultraviolet light absorber by uniformly mixing the modified 2-hydroxy-4-methoxybenzophenone and 2-(2'-hydroxy-5'-tert-octylphenyl)-benzotriazole at a weight ratio of 1:1.

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