High-transmittance weather-resistant coated glass for photovoltaic modules and preparation method thereof

Abstract

This invention discloses a high-transmittance, weather-resistant coated glass for photovoltaic modules and its preparation method, relating to the field of semiconductor photovoltaic module technology. The method includes the following steps: adding carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to an ethanol-water solution and stirring to obtain a quantum light conversion layer coating solution; adding vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to a composite solvent and mixing evenly to obtain a light-transmitting protective layer coating solution; roller-coating the quantum light conversion layer coating solution onto the surface of a glass substrate and curing to form a quantum light conversion layer; subsequently, roller-coating the light-transmitting protective layer coating solution onto the surface of the quantum light conversion layer and curing to form a light-transmitting protective layer, thus obtaining the coated glass. The coated glass prepared in this application exhibits good resistance to damp heat and high light transmittance, which helps to improve the performance of semiconductor photovoltaic modules.

Description

Technical Field

[0001] This invention relates to the field of semiconductor photovoltaic module technology, specifically to a high-transmittance, weather-resistant coated glass for photovoltaic modules and its preparation method. Background Technology

[0002] Semiconductor photovoltaic modules, often referred to as solar panels, are the core energy conversion unit of a solar power generation system. Their performance directly determines the system's absorption and photoelectric conversion efficiency of solar energy. Semiconductor photovoltaic modules mainly consist of coated glass, sealing film, semiconductor cells, backsheet, and frame. Among these, the coated glass, as the outermost cover of the module, plays a crucial role in protecting the other components and receiving sunlight.

[0003] Quantum dots, as a key component of coated glass, can convert ultraviolet photons with low battery utilization into visible light with high battery responsivity by utilizing their quantum confinement effect. This can effectively reduce the thermal loss of high-energy photons and improve photon utilization, thereby improving the photoelectric conversion efficiency of the component from an optical perspective.

[0004] Meanwhile, in the photoelectric conversion process, effective light input is a fundamental prerequisite, and it is necessary to minimize the loss caused by photon transmission. Therefore, for coated glass, it is not only necessary to provide protection for other photovoltaic modules, but also to ensure high light transmittance.

[0005] However, in practical use, it has been found that when quantum dots are exposed to humid and hot environments for a long time, fluorescence quenching occurs, leading to functional failure and even affecting interface stability. Not only does it fail to play a significant role, but the high stress can also cause microcracks in the coating layer, leading to moisture intrusion, damaging the matrix and more quantum dots, significantly reducing the protective function of the coating layer, and ultimately resulting in a significant decrease in the light transmittance of the coated glass and a significant decrease in the performance of the semiconductor photovoltaic module.

[0006] In summary, the development of a high-transmittance, weather-resistant coated glass for photovoltaic modules and its preparation method are of great significance in addressing the aforementioned issues. Summary of the Invention

[0007] The purpose of this invention is to provide a high-transmittance, weather-resistant coated glass for photovoltaic modules and its preparation method, so as to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] A high-transmittance, weather-resistant coated glass for photovoltaic modules, the coated glass comprising a glass substrate, and a quantum light conversion layer and a light-transmitting protective layer sequentially disposed on the surface thereof; the quantum light conversion layer contains carboxyl-modified cadmium telluride quantum dots.

[0010] Ideally, the thickness of the quantum light conversion layer is 80-120 nm, and the thickness of the light-transmitting protective layer is 100-180 nm.

[0011] In a more optimized manner, the raw materials of the quantum light conversion layer include the following components: by weight percentage, 4-6% carboxyl-modified cadmium telluride quantum dots, 4-8% hyperbranched polysiloxane, 6-15% organosilicon resin, and the remainder being an aqueous ethanol solution;

[0012] The raw materials of the light-transmitting protective layer include the following components: by weight percentage, 2-5% vinyl-modified hyperbranched polysiloxane, 0.5-0.8% ammonium persulfate, 8-12% vinyl monomer, and the remainder is a composite solvent.

[0013] In a further embodiment, the mass ratio of ethanol, deionized water, and butyl acetate in the composite solvent is (3~5):(2~3):1.

[0014] A more optimized method for preparing the hyperbranched polysiloxane is as follows: dodecyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and hydrochloric acid aqueous solution are added to an ethanol aqueous solution and reacted at room temperature for 5-7 h, followed by a reaction at 60-80 °C for 3-5 h. Then, 1,1,3,3-tetramethyldisiloxane is added and reacted at 50-70 °C for 1-3 h, followed by a reaction at 60-80 °C for 4-6 h. After purification and drying, the hyperbranched polysiloxane is obtained.

[0015] In a more optimized manner, the mass ratio of n-dodecyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, hydrochloric acid aqueous solution, and 1,1,3,3-tetramethyldisiloxane in the hyperbranched polysiloxane is 100:(20~30):(4~6):(10~15).

[0016] In a further embodiment, the concentration of the hydrochloric acid aqueous solution is 0.1 mol / L.

[0017] More preferably, the vinyl monomer comprises 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, methacrylate-terminated polydimethylsiloxane, methyl methacrylate, 3-(isobutenoyloxy)propyltrimethoxysilane, and 2,2,3,3,3-pentafluoro-2-fluoroacrylate in a mass ratio of 1:(1.2~1.5):(2~3):(0.3~0.5):(0.8~1).

[0018] In a more optimized manner, the preparation method of the vinyl-modified hyperbranched polysiloxane is as follows: hyperbranched polysiloxane, triethylamine, and 1-amino-10-undecene are added to DMF (N,N-dimethylformamide), reacted at 50~70℃ for 4~6h, purified and dried to obtain vinyl-modified hyperbranched polysiloxane.

[0019] In a more optimized manner, the mass ratio of hyperbranched polysiloxane, triethylamine, and 1-amino-10-undecene in the vinyl-modified hyperbranched polysiloxane is (10~12):(0.02~0.05):1.

[0020] A method for preparing high-transmittance, weather-resistant coated glass for photovoltaic modules includes the following steps:

[0021] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to an ethanol aqueous solution and stir at 40-60℃ for 3-5 hours to obtain a quantum light conversion layer coating solution.

[0022] Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to the composite solvent and mix evenly to obtain a light-transmitting protective layer coating solution;

[0023] Step 3: Roller-coat the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 80~100℃ for 10~30min to form the quantum light conversion layer; then roll-coat the light-transmitting protective layer coating liquid onto the surface of the quantum light conversion layer and cure it at 120~140℃ for 5~8min to form the light-transmitting protective layer, thus obtaining the coated glass.

[0024] An application of a high-transmittance, weather-resistant coated glass for photovoltaic modules, wherein the coated glass is used in photovoltaic modules.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0026] This application employs a liquid-phase roller coating method and in-situ thermal curing to form a quantum light conversion layer and a light-transmitting protective layer on the surface of a glass substrate, thereby obtaining coated glass. The two layers work synergistically to protect quantum dots from interference from moisture and thermal environments from both internal and external perspectives, preventing quantum dot functional failure, improving interface stability, and further enhancing the light transmittance of the coated glass, which helps to improve the performance of semiconductor photovoltaic modules.

[0027] In this process, a quantum light conversion layer coating solution is applied to the surface of a glass substrate using a liquid-phase roll coating method to form a quantum light conversion layer. Within this layer, hyperbranched polysiloxanes are prepared stepwise. Hydrophobic long-chain alkyl silanes form the nucleation base, while epoxy-containing silanes introduce reaction sites and are capped with flexible siloxanes, creating a three-dimensional branched structure. This results in less molecular chain entanglement and a larger free volume, giving the quantum light conversion layer coating solution low viscosity and high leveling properties, improving the atomization effect and film uniformity during liquid-phase roll coating. More importantly, this process enhances the interfacial bonding force with carboxyl-modified cadmium telluride quantum dots. This prevents quantum dot aggregation through steric hindrance and also helps improve the quantum dots' resistance to damp heat, enhancing their internal stability and thus increasing light transmittance.

[0028] However, internal stability alone is insufficient to withstand long-term external humid heat erosion. Furthermore, during long-term use, coated glass will still accumulate a lot of internal stress, resulting in microcracks that affect light transmittance.

[0029] To further reduce stress and improve external resistance to humidity and heat, the solution utilizes an in-situ thermosetting coating solution to roll-coat a light-transmitting protective layer onto the surface of the quantum light conversion layer, forming a light-transmitting protective layer. The coating solution comprises vinyl-modified hyperbranched polysiloxane, vinyl monomers, and other components in a specific mass ratio. The light-transmitting protective layer uses vinyl-modified hyperbranched polysiloxane as a flexible framework, combined with rigid fluorene monomers and flexible PDMS chains, forming a rigid-flexible network that reduces interfacial stress. Simultaneously, the silane linkages enhance the chemical bonding between the quantum light conversion layer, the light-transmitting protective layer, and the substrate, further improving stability. Fluorinated monomers form a superhydrophobic protective layer on the surface. Combined with the roll-coating and mild thermosetting process, this ensures the coating's density and interfacial stability, contributing to improved humidity and heat resistance and high light transmittance of the coated glass. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that the following quantities are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: 2,2,3,3,3-pentafluoro-2-fluoroacrylate propylene ester (CAS number 96250-35-0); carboxyl-modified cadmium telluride quantum dots (catalog number 104320) purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.; 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene (CAS number 161182-73-6); methacrylate-terminated polydimethylsiloxane purchased from Liyang Ruipu New Materials Co., Ltd.; and organosilicon... The resin was SR-110 with a viscosity of 110 MPa·s, purchased from Jiangsu Keqi Polymer Materials Research Institute Co., Ltd.; the CAS number of n-dodecyltrimethoxysilane was 3069-21-4; the linear polydimethylsiloxane was poly(dimethylsiloxane), bis(hydroxyalkyl)-terminated (PDMS), CAS number 156327-07-0, relative molecular mass 2000, catalog number C303004-25g, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; the CAS number of 3-(isobutenoyloxy)propyltrimethoxysilane was 2530-85-0, and other raw materials were all commercially available.

[0032] Example 1: A method for preparing high-transmittance, weather-resistant coated glass for photovoltaic modules, comprising the following steps:

[0033] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 6% hyperbranched polysiloxane, 9% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0034] Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to the composite solvent and mix thoroughly to obtain a light-transmitting protective layer coating solution (by weight percentage, 3.5% vinyl-modified hyperbranched polysiloxane, 0.65% ammonium persulfate, 10% vinyl monomer, and the remainder is composite solvent; in the composite solvent, the mass ratio of ethanol, deionized water, and butyl acetate is 4:2.5:1).

[0035] Step 3: Roll the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 90°C for 20 minutes to form a quantum light conversion layer (100nm); then roll the light-transmitting protective layer coating liquid onto the surface of the quantum light conversion layer and cure it at 130°C for 6.5 minutes to form a light-transmitting protective layer (140nm), thus obtaining the coated glass;

[0036] The preparation method of hyperbranched polysiloxane is as follows: 100 parts of n-dodecyltrimethoxysilane, 25 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 5 parts of 0.1 mol / L hydrochloric acid aqueous solution are added to 60 wt% ethanol aqueous solution and reacted at room temperature for 6 h, followed by reaction at 70 °C for 4 h. Then, 12.5 parts of 1,1,3,3-tetramethyldisiloxane are added and reacted at 60 °C for 2 h, followed by reaction at 70 °C for 5 h. After purification and drying, hyperbranched polysiloxane is obtained.

[0037] The vinyl monomers include 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, methacrylate-terminated polydimethylsiloxane, methyl methacrylate, 3-(isobutenoyloxy)propyltrimethoxysilane, and 2,2,3,3,3-pentafluoro-2-fluoroacrylate in a mass ratio of 1:1.35:2.5:0.4:0.9.

[0038] The method for preparing vinyl-modified hyperbranched polysiloxane is as follows: 11 parts of hyperbranched polysiloxane, 0.04 parts of triethylamine, and 1 part of 1-amino-10-undecene are added to DMF, reacted at 60°C for 5 h, purified and dried to obtain vinyl-modified hyperbranched polysiloxane.

[0039] Example 2: A method for preparing high-transmittance, weather-resistant coated glass for photovoltaic modules, comprising the following steps:

[0040] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 4% hyperbranched polysiloxane, 15% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0041] Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to the composite solvent and mix thoroughly to obtain a transparent protective layer coating solution (by weight percentage, 2% vinyl-modified hyperbranched polysiloxane, 0.5% ammonium persulfate, 12% vinyl monomer, and the remainder is the composite solvent; in the composite solvent, the mass ratio of ethanol, deionized water, and butyl acetate is 4:2.5:1).

[0042] Step 3: Roll the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 90°C for 20 minutes to form a quantum light conversion layer (80nm); then roll the light-transmitting protective layer coating liquid onto the surface of the quantum light conversion layer and cure it at 130°C for 6.5 minutes to form a light-transmitting protective layer (100nm), thus obtaining the coated glass;

[0043] The preparation method of hyperbranched polysiloxane is as follows: 100 parts of n-dodecyltrimethoxysilane, 25 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 5 parts of 0.1 mol / L hydrochloric acid aqueous solution are added to 60 wt% ethanol aqueous solution and reacted at room temperature for 6 h, followed by reaction at 70 °C for 4 h. Then, 12.5 parts of 1,1,3,3-tetramethyldisiloxane are added and reacted at 60 °C for 2 h, followed by reaction at 70 °C for 5 h. After purification and drying, hyperbranched polysiloxane is obtained.

[0044] The vinyl monomers include 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, methacrylate-terminated polydimethylsiloxane, methyl methacrylate, 3-(isobutenoyloxy)propyltrimethoxysilane, and 2,2,3,3,3-pentafluoro-2-fluoroacrylate in a mass ratio of 1:1.2:2:0.3:0.8.

[0045] The method for preparing vinyl-modified hyperbranched polysiloxane is as follows: 11 parts of hyperbranched polysiloxane, 0.04 parts of triethylamine, and 1 part of 1-amino-10-undecene are added to DMF, reacted at 60°C for 5 h, purified and dried to obtain vinyl-modified hyperbranched polysiloxane.

[0046] Example 3: A method for preparing high-transmittance, weather-resistant coated glass for photovoltaic modules, comprising the following steps:

[0047] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 8% hyperbranched polysiloxane, 15% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0048] Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to the composite solvent and mix thoroughly to obtain a transparent protective layer coating solution (by weight percentage, 5% vinyl-modified hyperbranched polysiloxane, 0.8% ammonium persulfate, 8% vinyl monomer, and the remainder is composite solvent; in the composite solvent, the mass ratio of ethanol, deionized water, and butyl acetate is 4:2.5:1).

[0049] Step 3: Roll the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 90°C for 20 minutes to form a quantum light conversion layer (120nm); then roll the light-transmitting protective layer coating liquid onto the surface of the quantum light conversion layer and cure it at 130°C for 6.5 minutes to form a light-transmitting protective layer (180nm), thus obtaining the coated glass;

[0050] The preparation method of hyperbranched polysiloxane is as follows: 100 parts of n-dodecyltrimethoxysilane, 25 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 5 parts of 0.1 mol / L hydrochloric acid aqueous solution are added to 60 wt% ethanol aqueous solution and reacted at room temperature for 6 h, followed by reaction at 70 °C for 4 h. Then, 12.5 parts of 1,1,3,3-tetramethyldisiloxane are added and reacted at 60 °C for 2 h, followed by reaction at 70 °C for 5 h. After purification and drying, hyperbranched polysiloxane is obtained.

[0051] The vinyl monomers include 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, methacrylate-terminated polydimethylsiloxane, methyl methacrylate, 3-(isobutenoyloxy)propyltrimethoxysilane, and 2,2,3,3,3-pentafluoro-2-fluoroacrylate in a mass ratio of 1:1.5:3:0.5:1.

[0052] The method for preparing vinyl-modified hyperbranched polysiloxane is as follows: 11 parts of hyperbranched polysiloxane, 0.04 parts of triethylamine, and 1 part of 1-amino-10-undecene are added to DMF, reacted at 60°C for 5 h, purified and dried to obtain vinyl-modified hyperbranched polysiloxane.

[0053] Comparative Example 1: The hyperbranched polysiloxane in the quantum light conversion layer was replaced with linear polydimethylsiloxane; the rest was the same as in Example 1; the specific differences are as follows:

[0054] Step 1: Add carboxyl-modified cadmium telluride quantum dots, linear polydimethylsiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 6% linear polydimethylsiloxane, 9% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0055] Comparative Example 2: The vinyl monomer in the light-transmitting protective layer was changed to methyl methacrylate; the rest was the same as in Example 1; the specific differences are as follows:

[0056] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 6% hyperbranched polysiloxane, 9% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0057] Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and methyl methacrylate to the composite solvent and mix evenly to obtain a light-transmitting protective layer coating solution (by weight percentage, 3.5% vinyl-modified hyperbranched polysiloxane, 0.65% ammonium persulfate, 10% methyl methacrylate, and the remainder is the composite solvent; in the composite solvent, the mass ratio of ethanol, deionized water, and butyl acetate is 4:2.5:1).

[0058] Comparative Example 3: The light-transmitting protective layer was not modified with vinyl hyperbranched polysiloxane; the rest was the same as in Example 1; the specific differences are as follows:

[0059] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 6% hyperbranched polysiloxane, 9% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0060] Step 2: Add ammonium persulfate and vinyl monomer to the composite solvent and mix evenly to obtain a light-transmitting protective layer coating solution (by weight percentage, 0.65% ammonium persulfate, 10% vinyl monomer, and the remainder is composite solvent; in the composite solvent, the mass ratio of ethanol, deionized water and butyl acetate is 4:2.5:1).

[0061] Comparative Example 4: No light-transmitting protective layer was prepared; otherwise, it was the same as Example 1; the specific differences are as follows:

[0062] Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to a 50wt% ethanol aqueous solution and stir at 50℃ for 4h to obtain a quantum light conversion layer coating solution (by weight percentage, 5% carboxyl-modified cadmium telluride quantum dots, 6% hyperbranched polysiloxane, 9% organosilicon resin, and the remainder is a 50wt% ethanol aqueous solution).

[0063] Step 2: Roll the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 90°C for 20 minutes to form a quantum light conversion layer (100nm), thus obtaining the coated glass.

[0064] Performance Test 1: The coated glasses prepared in Examples 1-3 and Comparative Examples 1-4 were used for 1000 hours at a temperature of 87°C and a humidity of 90%. The light transmittance before and after 1000 hours was tested. The test results are shown in Table 1.

[0065] Performance Test 2: The coated glasses prepared in Examples 1-3 and Comparative Examples 1-4 were used to prepare semiconductor photovoltaic modules by lamination, and the current density performance of the semiconductor photovoltaic modules was tested; the test results are shown in Table 1.

[0066] Table 1

[0067] sample Light transmittance % 100 hours after use Light transmittance % after 1000 hours of use <![CDATA[Current density mA / cm 2 > Example 1 98.3 97.1 40.8 Example 2 97.4 95.8 40.6 Example 3 98.1 97.0 40.5 Comparative Example 1 91.6 82.3 36.9 Comparative Example 2 89.3 84.6 38.8 Comparative Example 3 94.4 87.1 37.6 Comparative Example 4 93.2 79.8 36.2

[0068] Conclusion: The data in the table above show that the coated glass prepared in this application has good resistance to damp heat and high transmittance, and exhibits good electrochemical performance when used to prepare semiconductor photovoltaic modules. Comparative Example 1 shows that replacing the hyperbranched polysiloxane in the quantum light conversion layer with linear polydimethylsiloxane easily leads to agglomeration, higher viscosity, and difficulty in fogging, causing slight light scattering, decreased transmittance, and easy quantum dot failure, resulting in low current density. Comparative Example 2 shows that replacing the vinyl monomer in the light-transmitting protective layer with methyl methacrylate lacks a balance of rigidity and flexibility, increases stress, decreases interface stability, has poor initial transmittance, and reduces overall performance. Comparative Example 3 shows that without adding vinyl-modified hyperbranched polysiloxane to the light-transmitting protective layer, the lack of a hyperbranched framework results in high internal stress, easy cracking, significantly reduced resistance to damp heat, and decreased transmittance. Comparative Example 4 shows that without a light-transmitting protective layer and without an external protective layer, the overall performance is significantly reduced.

[0069] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-transmittance, weather-resistant coated glass for photovoltaic modules, characterized in that: The coated glass includes a glass substrate and a quantum light conversion layer and a light-transmitting protective layer sequentially disposed on its surface; the quantum light conversion layer contains carboxyl-modified cadmium telluride quantum dots; The raw materials of the light-transmitting protective layer include the following components: by weight percentage, 2-5% vinyl-modified hyperbranched polysiloxane, 0.5-0.8% ammonium persulfate, 8-12% vinyl monomer, and the remainder is a composite solvent; The vinyl-modified hyperbranched polysiloxane is prepared from the components hyperbranched polysiloxane, triethylamine, and 1-amino-10-undecene. The vinyl monomers include 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, methacrylate-terminated polydimethylsiloxane, methyl methacrylate, 3-(isobutenoyloxy)propyltrimethoxysilane, and 2,2,3,3,3-pentafluoro-2-fluoroacrylate in a mass ratio of 1:(1.2~1.5):(2~3):(0.3~0.5):(0.8~1).

2. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 1, characterized in that: The thickness of the quantum light conversion layer is 80~120nm; the thickness of the light-transmitting protective layer is 100~180nm.

3. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 1, characterized in that: The raw materials of the quantum light conversion layer include the following components: by weight percentage, 4-6% carboxyl-modified cadmium telluride quantum dots, 4-8% hyperbranched polysiloxane, 6-15% organosilicon resin, and the remainder being an aqueous ethanol solution.

4. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 3, characterized in that: The preparation method of the hyperbranched polysiloxane is as follows: dodecyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and hydrochloric acid aqueous solution are added to ethanol aqueous solution and reacted at room temperature for 5-7 h, followed by reaction at 60-80 °C for 3-5 h, 1,1,3,3-tetramethyldisiloxane is added and reacted at 50-70 °C for 1-3 h, followed by reaction at 60-80 °C for 4-6 h, purified and dried to obtain hyperbranched polysiloxane.

5. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 4, characterized in that: In the hyperbranched polysiloxane, the mass ratio of dodecyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, hydrochloric acid aqueous solution, and 1,1,3,3-tetramethyldisiloxane is 100:(20~30):(4~6):(10~15).

6. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 1, characterized in that: The method for preparing the vinyl-modified hyperbranched polysiloxane is as follows: hyperbranched polysiloxane, triethylamine, and 1-amino-10-undecene are added to DMF and reacted at 50-70°C for 4-6 hours. After purification and drying, the vinyl-modified hyperbranched polysiloxane is obtained.

7. The high-transmittance, weather-resistant coated glass for photovoltaic modules according to claim 6, characterized in that: In the vinyl-modified hyperbranched polysiloxane, the mass ratio of hyperbranched polysiloxane, triethylamine, and 1-amino-10-undecene is (10~12):(0.02~0.05):

1.

8. A method for preparing a high-transmittance, weather-resistant coated glass for photovoltaic modules according to any one of claims 1 to 7, characterized in that: Includes the following steps: Step 1: Add carboxyl-modified cadmium telluride quantum dots, hyperbranched polysiloxane, and organosilicon resin to an ethanol aqueous solution and stir at 40-60℃ for 3-5 hours to obtain a quantum light conversion layer coating solution. Step 2: Add vinyl-modified hyperbranched polysiloxane, ammonium persulfate, and vinyl monomer to the composite solvent and mix evenly to obtain a light-transmitting protective layer coating solution; Step 3: Roll the quantum light conversion layer coating liquid onto the surface of the glass substrate and cure it at 80~100℃ for 10~30 min to form the quantum light conversion layer; Subsequently, the light-transmitting protective layer coating liquid is roller-coated onto the surface of the quantum light conversion layer and cured at 120~140℃ for 5~8 minutes to form a light-transmitting protective layer, thus obtaining coated glass.

9. An application of a high-transmittance, weather-resistant coated glass for photovoltaic modules, characterized in that: The coated glass according to any one of claims 1 to 7 is used in photovoltaic modules.