CN117431018A - High-reflection photovoltaic backboard and double-sided photovoltaic module - Google Patents
High-reflection photovoltaic backboard and double-sided photovoltaic module Download PDFInfo
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- CN117431018A CN117431018A CN202311380724.9A CN202311380724A CN117431018A CN 117431018 A CN117431018 A CN 117431018A CN 202311380724 A CN202311380724 A CN 202311380724A CN 117431018 A CN117431018 A CN 117431018A
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- Photovoltaic Devices (AREA)
Abstract
The invention discloses a high-reflection photovoltaic backboard and a double-sided photovoltaic module, which belong to the technical field of photovoltaic backboard, and comprise a modified PET (polyethylene terephthalate) substrate, wherein the lower surface of the modified PET substrate is coated with a reinforcing coating to form a reinforcing coating, and the upper surface of the modified PET substrate is coated with an adhesive to form an adhesive layer; the glass substrate, the packaging adhesive film, the photovoltaic cell and the photovoltaic backboard are pressed to form a photovoltaic module, so that the photovoltaic module has a good light conversion rate; she Danla can reduce the mobility of the polymer, increasing the crystallinity of She Danla to PET; the aromatic structure contained in the carbon quantum dot can be stacked with the polymer through pi-pi, so that more ultraviolet light can be converted into visible light; the carbon quantum dot She Danla is embedded into bagasse-nano silver aerogel, and the formed aerogel is a lightweight porous amorphous nano material, and has excellent barrier property due to a continuous three-dimensional network structure and a porous structure.
Description
Technical Field
The invention relates to the technical field of photovoltaic back plates, in particular to a high-reflection photovoltaic back plate and a double-sided photovoltaic module.
Background
Photovoltaic modules are multilayer composite materials composed of different materials, glass, polymers, semiconductors and metals, the polymers being incorporated, on the one hand, in the form of a sealant, the main purpose of which is to protect the fragile crystalline cells, and, on the other hand, in the form of a backsheet, which must provide mechanical stability, electrical insulation and protection against environmental stresses, in order to meet these requirements, are generally composed of three layers of mostly different materials, which are either bonded together by means of an adhesive layer or are co-extruded, and which have different properties, since each layer has different requirements.
The effective utilization of renewable energy sources such as solar energy, wind energy and tidal energy is one of the solutions for realizing sustainable utilization of energy sources, and the spectral responses of the traditional single polycrystalline silicon battery and the black silicon and back-on-soup batteries which are rapidly developed recently have a commonality, namely the conversion efficiency to ultraviolet wave bands is obviously lower than that of visible light wave bands, and the ultraviolet light utilization rate is obviously lower. Therefore, in recent years, organic fluorescent dyes, organic-inorganic rare earth composites, up-conversion materials have been increasingly used in photovoltaic modules in order to increase the power output of the photovoltaic modules.
In the long-term outdoor environment using process of PET (polyethylene terephthalate) in the middle layer of the solar backboard, moisture and oxygen in the atmosphere can permeate into PET materials positioned in the middle layer through the lower surface protection layer, so that the PET layer is degraded, the protection and supporting functions of the solar cell are lost, and the crystallization performance of the PET base material is poor, so that the processability, the insulating performance and the mechanical performance are relatively weak, and the application of the PET base material on engineering plastics is limited; as an inorganic material, the dispersibility of the visible light quantum dot in an organic resin is to be improved.
Disclosure of Invention
The invention aims to provide a high-reflection light conversion photovoltaic backboard and a double-sided photovoltaic module: the carbon quantum dots are grafted She Danla and She Danla as inorganic mineral materials through the connecting agent, have excellent fire resistance and acid and alkali resistance, have larger surface area of the leaf paraffin, can reduce the mobility of the polymer, and increase the crystallinity of She Danla to PET; the composite material is characterized in that the carbon quantum dot She Danla is mixed with bagasse-nano silver composite material, the formed aerogel is a porous amorphous nano material with light weight, and the composite material has excellent barrier property due to a continuous three-dimensional network structure and a porous structure, and the synthesized nano silver has excellent antibacterial property and is combined with the carbon quantum dot She Danla through hydrogen bonds, so that the mechanical property of the composite material is increased; the visible light quantum dots are subjected to surface treatment by an ultraviolet absorber and are mixed with anthocyanin to form a microcapsule structure, so that the dispersibility of the visible light quantum dots in a resin matrix is improved, and the microcapsule also has excellent adhesiveness and can be adhered to the surface of a PET (polyethylene terephthalate) substrate.
The invention aims to solve the technical problems: in the long-term outdoor environment using process of PET in the middle layer of the solar backboard, moisture and oxygen in the atmosphere can permeate into PET material in the middle layer through the lower surface protection layer, so that the PET layer is degraded, the protection and supporting functions of the solar cell are lost, and the PET substrate is poor in crystallization performance, so that the processability, the insulating performance and the mechanical performance are relatively weak, and the application of the PET substrate to engineering plastics is limited; as an inorganic material, the dispersibility of the visible light quantum dot in an organic resin is to be improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a high-reflection light conversion photovoltaic backboard comprises a modified PET substrate, wherein the lower surface of the modified PET substrate is coated with a reinforcing coating to form a reinforcing coating, and the upper surface of the modified PET substrate is coated with an adhesive to form an adhesive layer;
the preparation process of the modified PET substrate comprises the following steps: mixing PET resin, a stabilizer and aerogel, extruding a cast sheet through a double-screw extruder, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a modified PET substrate;
the preparation process of the reinforced paint comprises the following steps: adding fluoroolefin-vinyl ether copolymer into toluene, stirring uniformly, adding microcapsule and leveling agent, and stirring at 500r/min to obtain reinforced paint;
the aerogel is prepared by mixing loaded carbon quantum dots She Danla, bagasse and silver ammonia solution to form hydrogel, and freeze-drying the hydrogel;
the microcapsule is formed by reacting visible light quantum dots with oligomeric procyanidine through an ultraviolet absorber, wherein the visible light quantum dots are used as cores, and the oligomeric procyanidine is used as a shell.
Further, the stabilizer is dibutyl tin dilaurate.
Further, the leveling agent is polymethylphenylsiloxane.
Further, the aerogel is prepared by the following steps:
A1. adding 10g She Danla into 30mL acetonitrile, uniformly stirring, adding 10g of a connecting agent and 0.5g of carbon quantum dots, adding a sodium hydroxide solution with the mass fraction of 70%, heating to 80 ℃, reacting for 4 hours, cooling to room temperature, filtering to obtain a filter cake, washing the filter cake with ethanol for 3 times to remove unreacted sodium hydroxide and the connecting agent, washing with deionized water for 3 times, drying in a 70 ℃ oven for 10min, taking out, and finely grinding to obtain the loaded carbon quantum dots She Danla;
the method comprises the steps of adding a catalyst sodium hydroxide into an acetonitrile solution of an organic solvent, enabling hydroxyl groups on the surface of leaf paraffin to react with hydroxyl groups on the surface of carbon quantum dots through epoxy groups in a connecting agent, enabling the carbon quantum dots to be grafted on the surface of She Danla, enabling aromatic structures contained in the carbon quantum dots to be stacked with the connecting agent through pi-pi, enabling more ultraviolet light to be converted into visible light, and further improving the generating capacity and the generating efficiency of a double-sided photovoltaic module;
further, the carbon quantum dot is specifically prepared by the following steps: 2g of glucose is dissolved in 10mL of deionized water, stirred, 7mL of ammonia water with the mass fraction of 25% is added, and microwave irradiation is carried out for 2min at 120 ℃ to obtain carbon quantum dots;
further, the particle size of the carbon quantum dots is 10-20nm.
Further, the connecting agent is formed by mixing epoxy resin and polyester according to the dosage ratio of (2-5) to (3-5).
The carboxyl in the glucose reacts with the amino to dehydrate the glucose, and after microwave irradiation at 120 ℃, carbon quantum dots with hydroxyl on the surfaces are formed, so that ultraviolet light can be absorbed, and the transmittance of visible light is improved;
A2. adding 5g of bagasse into 50mL of deionized water, uniformly stirring to obtain a suspension, adding 10mL of silver-ammonia solution and 0.27g of loaded carbon quantum dots She Danla, stirring, placing in a microwave oven, performing microwave radiation for 40min at the power of 800W and the temperature of 90 ℃, adding into 40mL of 1-ethyl-3-methylimidazole acetate after the reaction is finished, stirring, placing at the temperature of 100 ℃ for heating for 5h, cooling to room temperature to obtain hydrogel, pouring into a culture dish, cooling into deionized water to replace the 1-ethyl-3-methylimidazole acetate, stirring for 10min, taking out, and freeze-drying to obtain aerogel;
the cellulose, hemicellulose and lignin contained in bagasse are subjected to complexing crosslinking with silver ions, hydroxyl groups on the surface of paraffin carrying carbon quantum dots can be combined with hydroxyl groups on cellulose through hydrogen bonds, so that the carbon quantum dots She Danla are dispersed in bagasse suspension, further, the cellulose in bagasse also has reducibility, silver ions are reduced into silver simple substances, nano silver is synthesized in situ in the bagasse suspension, the nano silver is placed in 1-ethyl-3-methylimidazole acetate, cellulose in the bagasse is dissolved, the cellulose is favorably formed into gel, hydroxyl groups on the surface of the nano silver can be crosslinked with hydroxyl groups on the surface of cellulose, the nano silver and the carbon quantum dots She Danla are coated by hydrogel, and the hydrogel is frozen and placed in deionized water to replace the 1-ethyl-3-methylimidazole acetate, so that the porous aerogel is formed.
Further, the bagasse is specifically prepared by the following steps: washing sugarcane with hot water to remove sucrose in the sugarcane, adding into 10mL of mixed solution of toluene and 5mL of ethanol, extracting to remove pigment, starch and wax, filtering to obtain solid, grinding the solid, placing into 25% sodium hydroxide solution, stirring for 3h, and filtering to obtain bagasse.
Further, the microcapsule is prepared by the following steps:
adding 0.5g of visible light quantum dot into 30mL of ethanol, stirring, adding 2.57g of ultraviolet absorbent and 2mL of sulfuric acid with mass fraction of 30%, heating to 70 ℃, stirring and reacting for 10min, filtering by filter paper, washing with deionized water for 3 times, drying for 10min in a 70 ℃ oven, adding 0.2g of oligomeric procyanidine and 10mL of deionized water, stirring for 2h, adding polysorbate, stirring for 30min at 30 ℃, and crushing by a crusher to obtain microcapsules;
under the catalysis of sulfuric acid, hydroxyl groups on the surface of the visible light quantum dot and hydroxyl groups of the ultraviolet absorber are combined through hydrogen bonds, so that the ultraviolet absorber is coated on the surface of the visible light quantum dot, benzene rings and oxygen-containing functional groups contained in oligomeric procyanidine interact with the ultraviolet absorber, the visible light quantum dot is coated by a polymer to form a microcapsule structure, the dispersibility of the visible light quantum dot in a resin matrix is improved, and the microcapsule also has excellent adhesiveness and can be adhered on the surface of a PET (polyethylene terephthalate) substrate;
further, the visible light quantum dot is one of cadmium selenide, zinc sulfide, zinc selenide, cadmium sulfide and indium phosphide.
Further, the particle size of the visible light quantum dot is 0.1-0.3 mu m.
Further, the ultraviolet absorbent is octyl methoxycinnamate.
Further, the pore size of the filter paper was 0.45. Mu.m.
The utility model provides a two-sided photovoltaic module, includes from the top down stromatolite setting in proper order and is glass substrate, encapsulation glued membrane, photovoltaic cell piece and photovoltaic backplate, pass through the adhesion layer above the photovoltaic backplate and adhere with the photovoltaic cell piece, the photovoltaic cell piece passes through encapsulation glued membrane and glass substrate adhesion.
Further, the packaging adhesive film is a polyethylene oxide adhesive film.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the technical scheme, she Danla is taken as an inorganic mineral material, has excellent fire resistance and acid-base resistance, is added into a PET base material to improve fire resistance and corrosion resistance, and is modified by a polymer She Danla to improve the dispersibility and polarity of leaf paraffin, so that the larger surface area of the leaf paraffin can reduce the mobility of the polymer and increase the crystallinity of She Danla to PET; the carbon quantum dots have fluorescence characteristics, can absorb ultraviolet light as a light conversion material, improve the transmittance of visible light, are grafted on the surface of She Danla through polymers, have aliphatic structures and can be stacked with the polymers through pi-pi, so that more ultraviolet light can be converted into visible light, and the generating capacity and the generating efficiency of the double-sided photovoltaic module are improved.
(2) According to the technical scheme, cellulose, hemicellulose and lignin contained in bagasse can be used for synthesizing nano silver particles in the bagasse, the synthesized nano silver can penetrate into cytoplasm of bacteria, and the interaction of silver and cell components can cause damage to cells, so that the photovoltaic backboard has excellent antibacterial performance, the photovoltaic backboard is endowed with the antibacterial performance, and the storage time of the photovoltaic backboard is effectively prolonged; the bagasse-nano silver composite material has the advantages that carbonyl and hydroxyl contained in bagasse and nano silver can be combined with the loaded carbon quantum dots She Danla through hydrogen bonds, the loaded carbon quantum dots She Danla are embedded into the bagasse-nano silver aerogel, the mechanical property of the composite material is increased, the formed aerogel is a porous amorphous nano material with light weight, and the continuous three-dimensional reticular structure and the porous structure of the composite material have excellent barrier property, so that the barrier property of PET plates is improved, and in addition, the aerogel is used as a heat insulation material to realize photovoltaic power generation on the basis of meeting the heat insulation requirement of a light-transmitting roof of a building.
(3) According to the technical scheme, the visible light quantum dot is nano metalate, the visible light quantum dot is used as an inorganic material, the ultraviolet absorber is coated on the surface of the visible light quantum dot, the benzene ring and the oxygen-containing functional group contained in the oligomeric proanthocyanidin interact with the ultraviolet absorber to realize that the oligomeric proanthocyanidin coats the visible light quantum dot, so that a microcapsule structure is formed, the dispersibility of the visible light quantum dot in a resin matrix is improved, and the microcapsule also has excellent adhesiveness and can be adhered on the surface of a PET (polyethylene terephthalate) substrate.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The aerogel is prepared by the following steps:
A1. 2g of glucose is dissolved in 10mL of deionized water, stirred, 7mL of ammonia water with the mass fraction of 25% is added, and microwave irradiation is carried out for 2min at 120 ℃ to obtain carbon quantum dots;
A2. adding 10g She Danla into 30mL acetonitrile, uniformly stirring, adding 3g epoxy resin, 4g polyester and 0.5g carbon quantum dot, adding a sodium hydroxide solution with the mass fraction of 70%, heating to 80 ℃, reacting for 4 hours, cooling to room temperature, filtering to obtain a filter cake, washing the filter cake with ethanol for 3 times to remove unreacted sodium hydroxide and a connecting agent, washing with deionized water for 3 times, drying in a 70 ℃ oven for 10min, taking out, and finely grinding to obtain the loaded carbon quantum dot She Danla;
A3. washing sugarcane with hot water to remove sucrose in the sugarcane, adding into 10mL of mixed solution of toluene and 5mL of ethanol, extracting to remove pigment, starch and wax, filtering to obtain solid, grinding the solid, placing into 25% sodium hydroxide solution, stirring for 3h, and filtering to obtain bagasse;
A4. adding 5g of bagasse into 50mL of deionized water, uniformly stirring to obtain a suspension, adding 10mL of silver-ammonia solution and 0.27g of loaded carbon quantum dots She Danla, stirring, placing in a microwave oven, performing microwave radiation for 40min at the power of 800W and the temperature of 90 ℃, adding into 40mL of 1-ethyl-3-methylimidazole acetate after the reaction is finished, stirring, placing at the temperature of 100 ℃ for heating for 5h, cooling to room temperature to obtain hydrogel, pouring into a culture dish, cooling into deionized water to replace the 1-ethyl-3-methylimidazole acetate, stirring for 10min, taking out, and freeze-drying to obtain aerogel.
Comparative example 1
This comparative example differs from example 1 in that no leaf paraffin was added.
Comparative example 2
This comparative example differs from example 1 in that no bagasse-nano silver composite material was added.
Example 2
The reinforced paint is prepared by the following steps:
B1. adding 0.5g of visible light quantum dot into 30mL of ethanol, stirring, adding 2.57g of ultraviolet absorbent and 2mL of sulfuric acid with mass fraction of 30%, heating to 70 ℃, stirring and reacting for 10min, filtering by filter paper, washing with deionized water for 3 times, drying for 10min in a 70 ℃ oven, adding 0.2g of oligomeric procyanidine and 10mL of deionized water, stirring for 2h, adding polysorbate, stirring for 30min at 30 ℃, and crushing by a crusher to obtain microcapsules;
B2. 20g of fluoroolefin-vinyl ether copolymer was added to 50mL of toluene, stirred uniformly, 1.2g of microcapsule and 0.2g of polymethylphenylsiloxane were added, and stirred at a rate of 500r/min to obtain a reinforcing coating.
Comparative example 3
This comparative example differs from example 2 in that no visible light quantum dots were added.
Comparative example 4
This comparative example differs from example 2 in that no anthocyanin was added.
Comparative example 5
This comparative example differs from example 2 in that no microcapsules were added.
Example 3
The preparation method of the photovoltaic backboard comprises the following steps:
step 1, mixing 15g of PET resin, 0.3g of dibutyltin dilaurate and 1.3g of aerogel, extruding a cast sheet under the conditions that the extrusion partition temperature of a double-screw extruder is 275 ℃, 278 ℃, 280 ℃, the die head temperature is 280 ℃ and the cold roll temperature is 15 ℃, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a modified PET substrate;
step 2, coating the reinforced coating on the surface of the PET substrate, solidifying in a baking oven at 20 ℃, taking out, cooling, coating an EVA bonding layer on the other surface of the modified PET substrate, and solidifying in a baking oven at 25 ℃ to form a photovoltaic backboard composed of the reinforced coating, the modified PET substrate and the bonding agent;
the preparation method of the double-sided photovoltaic module comprises the following steps:
and (3) sequentially superposing the front plate glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard from top to bottom, then placing the laminated glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard into a vacuum laminating machine with the temperature of 140 ℃ for lamination for 22min, deburring, framing and welding a junction box to obtain the double-sided photovoltaic module.
Example 4
The preparation method of the photovoltaic backboard comprises the following steps:
step 1, mixing 20g of PET resin, 0.5g of dibutyltin dilaurate and 1.34g of aerogel, extruding a cast sheet under the conditions that the extrusion partition temperature of a double-screw extruder is 275 ℃, 278 ℃, 280 ℃, the die head temperature is 280 ℃ and the cold roll temperature is 15 ℃, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a modified PET substrate;
step 2, coating the reinforced coating on the surface of the PET substrate, solidifying in a baking oven at 30 ℃, taking out, cooling, coating an EVA bonding layer on the other surface of the modified PET substrate, and solidifying in a baking oven at 30 ℃ to form a photovoltaic backboard composed of the reinforced coating, the modified PET substrate and the bonding agent;
the preparation method of the double-sided photovoltaic module comprises the following steps:
and (3) sequentially superposing the front plate glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard from top to bottom, then placing the laminated glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard into a vacuum laminating machine with the temperature of 145 ℃ for lamination for 22min, deburring, framing and welding a junction box to obtain the double-sided photovoltaic module.
Example 5
The preparation method of the photovoltaic backboard comprises the following steps:
step 1, mixing 25g of PET resin, 0.7g of dibutyltin dilaurate and 1.4g of aerogel, extruding a cast sheet under the conditions that the extrusion partition temperature of a double-screw extruder is 275 ℃, 278 ℃, 280 ℃, the die head temperature is 280 ℃ and the cold roll temperature is 15 ℃, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a modified PET substrate;
step 2, coating the reinforced coating on the surface of the PET substrate, solidifying in a baking oven at 40 ℃, taking out, cooling, coating an EVA bonding layer on the other surface of the modified PET substrate, and solidifying in a baking oven at 35 ℃ to form a photovoltaic backboard composed of the reinforced coating, the modified PET substrate and the bonding agent;
the preparation method of the double-sided photovoltaic module comprises the following steps:
and (3) sequentially superposing the front plate glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard from top to bottom, then placing the laminated glass, the polyethylene oxide adhesive film, the photovoltaic cell sheet and the photovoltaic backboard into a vacuum laminating machine with the temperature of 150 ℃ for lamination for 22min, deburring, framing and welding a junction box to obtain the double-sided photovoltaic module.
Comparative example 6
This comparative example differs from example 3 in that the aerogel was replaced with the material prepared in comparative example 1.
Comparative example 7
This comparative example differs from example 3 in that the aerogel was replaced with the material prepared in comparative example 2.
Comparative example 8
This comparative example differs from example 3 in that the reinforcing coating was replaced by the material prepared in comparative example 3.
Comparative example 9
This comparative example differs from example 3 in that the reinforcing coating was replaced by the material prepared in comparative example 4.
Comparative example 10
This comparative example differs from example 3 in that the reinforcing coating was replaced by the material prepared in comparative example 5.
Performance tests were now performed on the photovoltaic back sheets prepared in example 3 and comparative examples 6-10;
detecting light conversion performance of the photovoltaic module by adopting IEC60904-1, and recording the generated energy; detecting the mechanical performance of the photovoltaic module by adopting IEC61215-1, IEC61215-2 and IEC61646-1 standards; the test results are shown in table 1 below:
TABLE 1
As can be seen from the data in table 1, comparative example 5, in which the prepared aerogel was added to a PET resin matrix without She Danla, as a photovoltaic backsheet, the light conversion rate of the bifacial photovoltaic module was reduced, probably because of the larger surface area of the leaf paraffin, which can reduce the mobility of the polymer and increase the crystallinity of She Danla to PET; comparative example 6 the prepared aerogel was added to the PET resin matrix without adding the bagasse-nano silver composite, and as a photovoltaic back sheet, the antibacterial property of the double-sided photovoltaic module was lowered, probably because the nano silver in the bagasse-nano silver composite had excellent antibacterial property, effectively prolonged the storage of the photovoltaic back sheet, and the bagasse-nano silver composite was bonded with the loaded carbon quantum dots She Danla by hydrogen bonding, improving the dispersibility of the loaded carbon quantum dots She Danla; in comparative example 7, the prepared microcapsule is added into the coating as the outer layer of the PET substrate, and the light conversion rate of the photovoltaic backboard is reduced, probably because the visible light quantum dot is nano metalate and is used as an inorganic material, the visible light quantum dot is coated by oligomeric procyanidine, and the dispersibility of the visible light quantum dot in the resin matrix is improved; comparative example 8 the prepared microcapsules were added to a coating material as an outer layer of a PET substrate, and the light conversion rate of the photovoltaic back sheet was lowered, probably because the microcapsules also had excellent adhesion, so that the reinforcing coating material was adhered to the surface of the PET substrate, and the light conversion rate was increased.
The data in Table 1 shows that the photovoltaic back plates and the double-sided photovoltaic modules prepared in examples 3-5 have good light conversion rate and mechanical properties, and the PET plate has good crystallinity, so that the conversion of sunlight is facilitated. Mixing PET resin, a stabilizer and aerogel, extruding a cast sheet through a double-screw extruder, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a PET substrate; the reinforced coating is coated on the surface of a PET (polyethylene terephthalate) substrate, after curing, an ethylene-vinyl acetate binder is coated on the other surface of the PET substrate, and after curing, the obtained photovoltaic backboard meets the requirement of test performance, but the photovoltaic backboard prepared in comparative examples 6-10 does not meet the standard of performance requirement, which indicates that the photovoltaic backboard prepared in the invention not only has better light conversion rate and mechanical performance, but also has better crystallinity of PET board, and is beneficial to conversion of sunlight.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (10)
1. The high-reflection light conversion photovoltaic backboard is characterized by comprising a modified PET substrate, wherein the lower surface of the modified PET substrate is coated with a reinforcing coating to form a reinforcing coating, and the upper surface of the modified PET substrate is coated with an adhesive to form an adhesive layer;
the preparation process of the modified PET substrate comprises the following steps: mixing PET resin, a stabilizer and aerogel, extruding a cast sheet through a double-screw extruder, and stretching, cooling, drawing, coiling and cutting the cast sheet to obtain a modified PET substrate;
the preparation process of the reinforced paint comprises the following steps: adding fluoroolefin-vinyl ether copolymer into toluene, stirring uniformly, adding microcapsule and leveling agent, and stirring at 500r/min to obtain reinforced paint;
the aerogel is prepared by mixing loaded carbon quantum dots She Danla, bagasse and silver ammonia solution to form hydrogel, and freeze-drying the hydrogel;
the microcapsule is formed by reacting visible light quantum dots with oligomeric procyanidine through an ultraviolet absorber, wherein the visible light quantum dots are used as cores, and the oligomeric procyanidine is used as a shell.
2. The highly reflective, light converting photovoltaic backsheet of claim 1 wherein the aerogel is prepared by the steps of:
A1. adding She Danla into acetonitrile, stirring uniformly, adding a connecting agent and carbon quantum dots, adding a sodium hydroxide solution with the mass fraction of 70%, reacting for 4 hours at 80 ℃, cooling to room temperature, filtering to obtain a filter cake, washing and drying the filter cake, taking out, and finely grinding to obtain the loaded carbon quantum dots She Danla;
A2. adding bagasse into deionized water, uniformly stirring to obtain a suspension, adding silver-ammonia solution and loaded carbon quantum dots She Danla, stirring, placing in a microwave oven, performing microwave radiation for 40min at the power of 800W and the temperature of 90 ℃, adding into 1-ethyl-3-methylimidazole acetate after the reaction is finished, stirring, placing at the temperature of 100 ℃ for heating for 5h, cooling to room temperature to obtain hydrogel, pouring the hydrogel into a culture dish for freezing, placing into deionized water, stirring for 10min, taking out, and freeze-drying to obtain aerogel.
3. The highly reflective photovoltaic backsheet according to claim 2, wherein the carbon quantum dots are made by: glucose is dissolved in deionized water, stirred uniformly, ammonia water with the mass fraction of 25% is added, and microwave irradiation is carried out for 2min at 120 ℃ to obtain the carbon quantum dots.
4. The highly reflective, light converting photovoltaic backsheet of claim 2 wherein said bagasse is made by the steps of: washing sugarcane with hot water to remove sucrose in the sugarcane, adding into a mixed solution of toluene and ethanol, extracting to remove pigment and starch to obtain solid, grinding the solid, placing into a sodium hydroxide solution with the mass fraction of 25%, stirring for 3h, and filtering to obtain bagasse.
5. The high reflection photovoltaic backsheet according to claim 1, wherein the twin screw extruder extrusion zone temperatures are 275 ℃, 278 ℃, 280 ℃, die temperature 280 ℃ and chill roll temperature 15 ℃, respectively.
6. The highly reflective light converting photovoltaic backsheet of claim 1 wherein said microcapsules are made by the steps of:
adding visible light quantum dots into ethanol, stirring, adding an ultraviolet absorbent and sulfuric acid with the mass fraction of 30%, heating to 70 ℃, stirring and reacting for 10min, filtering by filter paper, washing, drying, adding into oligomeric procyanidine and deionized water, stirring for 2h, adding polysorbate, stirring for 30min at 30 ℃, and crushing by a crusher to obtain microcapsules.
7. The high reflection, light conversion photovoltaic backsheet of claim 6 wherein the visible light quantum dot is one of cadmium selenide, zinc sulfide, zinc selenide, cadmium sulfide, indium phosphide.
8. The highly reflective photovoltaic backsheet according to claim 6, wherein the visible light quantum dots have a particle size of 0.1-0.3 μm.
9. The highly reflective photovoltaic backsheet according to claim 6, wherein the uv absorber is octyl methoxycinnamate.
10. The double-sided photovoltaic module comprises a glass substrate, a packaging adhesive film, a photovoltaic cell and the photovoltaic backboard according to any one of claims 1-9, wherein the glass substrate, the packaging adhesive film, the photovoltaic cell and the photovoltaic backboard are sequentially laminated from top to bottom, the photovoltaic cell is adhered to the glass substrate through the adhesive layer, and the photovoltaic cell is adhered to the glass substrate through the packaging adhesive film.
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