Rosin-based ultraviolet curing assembly method

Abstract

The invention discloses a rosinyl-based ultraviolet light curing assembly method, and relates to the technical field of photovoltaic building integration, the ultraviolet light curing assembly method comprises the following steps: S1, preparation of modified rosinyl resin; s2, preparing the rosin-based adhesive: mixing the modified rosin-based resin, urethane acrylate, a photoinitiator, a reactive diluent, a rosin cross-linking agent, an adhesion promoting monomer and a flatting agent, uniformly stirring, and irradiating by using a UV lamp to obtain the rosin-based adhesive; s3, assembling the photovoltaic tiles; and S4, carrying out ultraviolet light curing on the photovoltaic tile. The adhesive is prepared from the modified rosin-based resin and the urethane acrylate, so that the adhesive has excellent adhesion performance, the glass plate and the BC battery piece are ensured to be firmly adhered together, and the stable function of the photovoltaic tile structure is realized.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic building integration, in particular to a rosin-based ultraviolet light curing assembly method. Background Art

[0002] Photovoltaic building integration is a technology that integrates photovoltaic products into buildings. With the rapid development of new energy and the increasing emphasis on urban energy conservation, emission reduction and green environmental protection, people are paying more and more attention to photovoltaic building integration. UV curing technology has been widely used because of its environmental protection and high efficiency. It has a fast curing speed and low energy consumption. Therefore, it can greatly improve production efficiency in the manufacturing process of photovoltaic building integration products.

[0003] By using rosin-based UV-curing adhesives, the strong bonding of photovoltaic modules can be ensured. The chemical bonds in the adhesive are further strengthened under UV light, forming a high-strength and high-durability cured product, ensuring the stability of the structure of photovoltaic building integrated products during long-term use and preventing corrosion, and avoiding the degradation of photovoltaic product performance due to environmental changes. Therefore, a rosin-based UV-curing assembly method is extremely important.

[0004] 1. Patent document CN116017898B discloses an electronic device and an assembly method of the electronic device. The above patent realizes the assembly between the back cover and the middle frame. It only needs to light activate the UV curing tape and press the back cover and the middle frame. However, the above patent cannot realize the stability function of the photovoltaic tile structure.

[0005] 2. Patent document CN103232832B discloses a fast-curing sealant for solar photovoltaic modules and a preparation method thereof. The above patent realizes the rapid curing of the sealant, meets the continuous assembly line operation requirements of the solar photovoltaic module industry and improves the sealing of photovoltaic modules, but the above patent cannot achieve the function of improving the weather resistance of the photovoltaic tile glue layer.

[0006] 3. Patent document CN110667226B discloses a photovoltaic module packaging system and a photovoltaic module packaging method. The above patent achieves effective reduction or prevention of cavities and warping deformation at the edges, but the above patent cannot achieve the function of improving the mechanical properties of the photovoltaic tile glue layer.

[0007] 4. Patent document CN117080312B discloses a photovoltaic device and its packaging system and packaging method. The above patent realizes the packaging of photosensitive sealant at room temperature, reduces packaging costs, and improves packaging efficiency and packaging quality. However, the above patent cannot achieve the function of improving the light energy utilization rate of photovoltaic tiles.

[0008] In summary, the above patents cannot achieve the function of stabilizing the photovoltaic tile structure, cannot achieve the function of improving the weather resistance of the photovoltaic tile adhesive layer, cannot achieve the function of improving the mechanical properties of the photovoltaic tile adhesive layer, and cannot achieve the function of improving the light energy utilization rate of the photovoltaic tile, resulting in the problems that the glass plate and the battery cell cannot be firmly bonded together, the photovoltaic tile has a short service life, the photovoltaic tile adhesive layer has poor hardness and impact resistance, and the light energy utilization rate is low;

[0009] To this end, the present application proposes a rosin-based UV-curing assembly method that can achieve the functions of stabilizing the photovoltaic tile structure, improving the weather resistance of the photovoltaic tile adhesive layer, improving the mechanical properties of the photovoltaic tile adhesive layer, and improving the light energy utilization rate of the photovoltaic tile. Summary of the invention

[0010] The purpose of the present invention is to provide a rosin-based UV-curing assembly method to solve the technical problems proposed in the above background technology that the photovoltaic tile structure cannot be stabilized, the weather resistance of the photovoltaic tile adhesive layer cannot be improved, the mechanical properties of the photovoltaic tile adhesive layer cannot be improved, and the light energy utilization rate of the photovoltaic tile cannot be improved, resulting in the glass plate and the battery cell cannot be firmly bonded together, the service life of the photovoltaic tile is short, the hardness and impact resistance of the photovoltaic tile adhesive layer are poor, and the light energy utilization rate is low.

[0011] To achieve the above object, the present invention provides the following technical solution: a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0012] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0013] S2. Preparation of rosin-based adhesive: Mix modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent, stir evenly, and irradiate with UV lamp to obtain rosin-based adhesive;

[0014] S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0015] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into the UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back of the sample.

[0016] Preferably, the step S1 includes the following steps:

[0017] S11. Preparation of maleopimaric acid epoxy resin:

[0018] Step 1: Pour maleopimaric anhydride and epichlorohydrin into a reaction container, add tetrabutylammonium bromide into the reaction container, place the reaction container on a heating device, heat to 100° C., and stir;

[0019] Step 2: Add sodium hydroxide solution dropwise to the reaction container, filter the reaction mixture, wash with deionized water, remove the solvent and unreacted epichlorohydrin under reduced pressure, and obtain maleopimaric acid epoxy resin.

[0020] Preferably, the method for preparing maleopimaric anhydride in step 1 comprises the following steps:

[0021] (1) grinding and crushing the rosin, placing the crushed rosin into a reaction container, filling the reaction container with nitrogen, and heating the reaction container;

[0022] (2) Add glacial acetic acid, maleic anhydride and toluenesulfonic acid to a reaction container in sequence, stir the reaction using a stirring device, pour the reactants into an ice water bath to cool, filter, wash and purify the precipitated product to obtain maleopimaric anhydride.

[0023] Preferably, S2 includes the following steps:

[0024] S21. Preparation of polyurethane acrylate:

[0025] Step 1: adding polytetrahydrofuran into a reaction container, filling the reaction container with nitrogen, heating the reaction container, sequentially adding diphenylmethane diisocyanate and dibutyltin dilaurate, and stirring with a stirring device to obtain a polyurethane prepolymer;

[0026] Step 2: Mix the polyurethane prepolymer and hydroxyethyl methacrylate, and react at 50° C. for 2 hours to obtain polyurethane acrylate.

[0027] Preferably, S3 includes the following steps:

[0028] S31, preparation of rosin-based conductive adhesive: placing modified rosin-based resin in a reaction container, adding silver-coated copper powder, silane coupling agent and photoinitiator into the reaction container, stirring with a stirring device, mixing evenly, and preparing rosin-based conductive adhesive;

[0029] S32. Connection of BC cells: Use shingling technology to stack the BC cells together. Adjacent BC cells are bonded together using rosin-based conductive adhesive. The BC cells are bonded into strings. The stacked BC cells are placed in a UV curing device for UV curing.

[0030] Preferably, the rosin crosslinking agent is rosin-based pentaerythritol triacrylate, and the preparation method of rosin-based pentaerythritol triacrylate comprises the following steps:

[0031] (1) dissolving disproportionated rosin in ethanol, adding ethanolamine, extracting and recrystallizing to obtain dehydroabietic acid, dissolving dehydroabietic acid in dichloromethane, stirring, slowly adding thionyl chloride dropwise, and removing the solvent and excess thionyl chloride using a vacuum distillation apparatus to obtain dehydroabietic acid chloride;

[0032] (2) dissolving dehydroabietic acid chloride in an acetone solution, stirring, and dropwise adding pentaerythritol triacrylate and 4-dimethylaminopyridine into the solution;

[0033] (3) The reactant is centrifuged and the supernatant is washed to obtain rosin-based pentaerythritol triacrylate.

[0034] Preferably, the adhesion promoting monomer is hydroxyethyl acrylate phosphate.

[0035] Preferably, the reactive diluent is selected from one of styrene, methyl methacrylate, isobutyl acrylate and bisphenol A diacrylate.

[0036] Preferably, S3 includes the following steps:

[0037] S33, processing of the glass plate: using a detergent and clean water to clean the glass plate to remove impurities on the surface of the glass plate, and using a dry cloth to wipe the glass plate dry to remove moisture on the surface of the glass plate;

[0038] S34. Treatment of the assembly table: Use a level to calibrate the level of the assembly table, lay a layer of anti-slip material on the assembly table, and lay the glass plate flat on the anti-slip material.

[0039] Preferably, S4 includes the following steps:

[0040] S41. Take out the cured photovoltaic tiles from the UV curing machine, let them stand for a while, check their appearance, clean their surface, and remove the rosin-based adhesive remaining on the surface.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention prepares the adhesive by modifying rosin-based resin and polyurethane acrylate, so that the adhesive has excellent adhesion properties, ensuring that the glass plate and the BC cell are firmly bonded together, and realizing the stability function of the photovoltaic tile structure;

[0043] 2. The present invention improves the heat resistance of the rosin-based resin through the modification treatment of maleopimaric acid epoxy resin. The rosin crosslinking agent can react with the functional groups in the adhesive molecules to form a crosslinking structure, thereby improving the heat resistance of the rosin-based adhesive and achieving the function of improving the weather resistance of the photovoltaic tile adhesive layer;

[0044] 3. The present invention improves the adhesion between the adhesive and the glass plate and the BC cell by introducing adhesion-promoting monomers, and the rosin crosslinking agent undergoes polymerization reaction with the molecular functional groups in the rosin-based adhesive to form a crosslinking structure, thereby improving the strength of the adhesive and achieving the function of improving the mechanical properties of the photovoltaic tile adhesive layer;

[0045] 4. The present invention improves the photoelectric conversion efficiency by stacking BC battery sheets and bonding them into strings using rosin-based conductive adhesive, thereby solving the problem of light energy loss caused by traditional grid line shading and achieving the function of improving the light energy utilization rate of photovoltaic tiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the UV curing assembly process of the present invention;

[0047] Figure 2 This is a schematic diagram of the preparation process of maleopimaric acid epoxy resin of the present invention;

[0048] Figure 3 This is a schematic diagram of the preparation process of maleopimaric anhydride of the present invention;

[0049] Figure 4 This is a schematic diagram of the preparation process of polyurethane acrylate of the present invention;

[0050] Figure 5 It is a schematic diagram of the active diluent of the present invention;

[0051] Figure 6 It is a schematic diagram of the BC battery cell connection process of the present invention;

[0052] Figure 7 It is a schematic diagram of the photovoltaic tile assembly process of the present invention;

[0053] Figure 8 It is a schematic diagram of the curing process of the photovoltaic tile of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 , a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0056] S1. Preparation of modified rosin-based resin: grinding and crushing rosin, putting the crushed rosin into a reaction container, filling the reaction container with nitrogen, heating the reaction container, sequentially adding glacial acetic acid, maleic anhydride and toluenesulfonic acid into the reaction container, stirring with a stirring device, pouring the reactants into an ice-water bath to cool, filtering, washing and purifying the precipitated product to obtain maleopimaric anhydride, pouring maleopimaric anhydride and epichlorohydrin into the reaction container, and stirring the reaction container. tetrabutylammonium bromide is added to the reaction vessel, the reaction vessel is placed on a heating device, heated to 100° C., and stirred at the same time, a sodium hydroxide solution is added dropwise to the reaction vessel, the reaction mixture is filtered, and washed with deionized water, and the solvent and unreacted epichlorohydrin are removed under reduced pressure to obtain a maleopimaric acid epoxy resin, the maleopimaric acid epoxy resin is placed in a reaction vessel, the reaction vessel is heated, and methacrylic acid, tetrabutylammonium bromide and hydroquinone are added dropwise to the reaction vessel to obtain a modified rosin-based resin;

[0057] S2. Preparation of rosin-based adhesive: Mix modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent, stir evenly, and irradiate with UV lamp to obtain rosin-based adhesive;

[0058] S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0059] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into a UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front side of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back side of the sample;

[0060] Furthermore, rosin and its derivatives have a special phenanthrene ring structure, which can be introduced by chemical modification to enhance the adhesion and corrosion resistance of the polymer. Maleopimaric anhydride, as a rosin derivative, makes the maleopimaric acid epoxy resin prepared from maleopimaric anhydride have excellent weather resistance. By introducing methacrylic acid functional groups into maleopimaric acid epoxy resin, a modified rosin-based resin is obtained. The carboxyl group in methacrylic acid, as an active functional group, can participate in the cross-linking reaction of the resin, thereby improving the cross-linking density and strength of the resin, and further improving the adhesion of the adhesive.

[0061] The rosin-based adhesive prepared from modified rosin-based resin combines the advantages of rosin and modified resin, has good adhesion properties, and can firmly bond glass plates and solar cells. Under the irradiation of ultraviolet light, the rosin-based adhesive can cure quickly, allowing photovoltaic tiles to be cured at room temperature, thereby reducing energy consumption during high-temperature curing. The rosin-based adhesive also has good weather resistance and can adapt to the needs of different working environments, such as high temperature, low temperature, humidity and other harsh conditions, thereby increasing the service life of photovoltaic tiles.

[0062] Example 2, please refer to Figure 1 , Figure 4 , Figure 7 and Figure 8 , a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0063] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0064] S2. Preparation of rosin-based adhesive: adding polytetrahydrofuran to a reaction container, filling the reaction container with nitrogen, heating the reaction container, sequentially adding diphenylmethane diisocyanate and dibutyltin dilaurate, stirring with a stirring device to obtain a polyurethane prepolymer, mixing the polyurethane prepolymer with hydroxyethyl methacrylate, reacting at 50° C. for 2 h to obtain polyurethane acrylate, mixing modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent, stirring evenly, and irradiating with a UV lamp to obtain a rosin-based adhesive;

[0065] S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0066] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into a UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front side of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back side of the sample;

[0067] Furthermore, the urethane bonds and acrylate double bonds in polyurethane acrylate can react with the carboxyl groups of modified rosin-based resins. Under the irradiation of ultraviolet light and the action of photoinitiators, these functional groups are activated, thereby initiating a chain reaction to form a high molecular weight polymer network structure. The co-curing of polyurethane acrylate and modified rosin-based resin can form a stronger chemical bond, thereby improving the adhesion of rosin-based adhesives to glass plates and solar cells. In addition, the introduction of polyurethane acrylate can improve the mechanical properties of rosin-based adhesives, so that the cured adhesive layer has good toughness, hardness, impact resistance, etc., so that photovoltaic tiles can adapt to more environments.

[0068] Example 3, please refer to Figure 1 , Figure 7 and Figure 8 , a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0069] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0070] S2, preparation of rosin-based adhesive: disproportionated rosin is dissolved in ethanol, ethanolamine is added, extraction and recrystallization are performed to obtain dehydroabietic acid, dehydroabietic acid is dissolved in dichloromethane, stirred, thionyl chloride is slowly added dropwise, the solvent and excess thionyl chloride are removed by a vacuum distillation apparatus to obtain dehydroabietic acid chloride, dehydroabietic acid chloride is dissolved in an acetone solution, stirred, pentaerythritol triacrylate and 4-dimethylaminopyridine are added dropwise to the solution, the reactants are centrifuged, the supernatant is washed to obtain rosin-based pentaerythritol triacrylate, which is a rosin crosslinking agent, modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent are mixed, stirred evenly, and irradiated with a UV lamp to obtain a rosin-based adhesive;

[0071] S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0072] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into a UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front side of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back side of the sample;

[0073] Furthermore, rosin-based pentaerythritol triacrylate is used as a cross-linking agent. Acrylate double bonds are introduced into rosin-based pentaerythritol triacrylate. Under ultraviolet light irradiation, these double bonds undergo polymerization reaction with acrylate double bonds in polyurethane acrylate, thereby forming a high molecular weight polymer network structure, thereby increasing the cross-linking density of the rosin-based adhesive and the hardness of the rosin-based adhesive after curing. At the same time, the cross-linking structure enhances the weather resistance and chemical resistance of the rosin-based adhesive, making it difficult for the cured rosin-based adhesive to be corroded by the external environment, thereby enabling the rosin-based adhesive to maintain stable performance during long-term use, thereby increasing the service life of the photovoltaic tile. The ultraviolet rays emitted by the UV lamp can excite the photoinitiator, causing the photoinitiator to produce active species such as free radicals or ions, thereby initiating the polymerization reaction of the polyurethane acrylate and the modified rosin-based resin, and ensuring that the adhesive has good bonding performance and stability.

[0074] Example 4, please refer to Figure 1 , Figure 5 , Figure 7 and Figure 8 , a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0075] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0076] S2. Preparation of rosin-based adhesive: Modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent are mixed, wherein the adhesion promoting monomer is hydroxyethyl acrylate phosphate, and the reactive diluent is styrene, the mixture is stirred evenly, and irradiated with UV lamp to obtain rosin-based adhesive;

[0077] S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0078] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into a UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front side of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back side of the sample;

[0079] Furthermore, hydroxyethyl acrylate phosphate is used as an adhesion-promoting monomer. The phosphate group in hydroxyethyl acrylate phosphate has strong polarity and can form a chemical bond with the polar group on the surface of the adhered material, thereby improving the adhesion of the rosin-based adhesive. At the same time, hydroxyethyl acrylate phosphate can improve the wettability of the rosin-based adhesive on the surface of the adhered material, making it easy for the rosin-based adhesive to penetrate into the tiny pores of the adhered material, so that the rosin-based adhesive is closely combined with the surface of the adhered material, making the combination between the glass plate and the battery cell more firm, thereby further improving the adhesion of the rosin-based adhesive;

[0080] As an active diluent, styrene can reduce the degree of entanglement between polymer chains in rosin-based adhesives through its intermolecular interaction force, thereby reducing the viscosity of the rosin-based adhesives, making the rosin-based adhesives easier to coat on the surface of glass plates and battery cells. At the same time, styrene has polymerizable double bonds and can undergo polymerization reactions with functional groups in other components, such as the acrylate double bonds in polyurethane acrylates, thereby becoming a part of the curing network structure of the rosin-based adhesive, thereby not affecting the curing properties of the rosin-based adhesive.

[0081] Example 5, please refer to Figure 1 , Figure 6 , Figure 7 and Figure 8 , a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0082] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0083] S2. Preparation of rosin-based adhesive: Mix modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent, stir evenly, and irradiate with UV lamp to obtain rosin-based adhesive;

[0084] S3, assembly of photovoltaic tiles: place modified rosin-based resin in a reaction container, add silver-coated copper powder, silane coupling agent and photoinitiator into the reaction container, stir with a stirring device, mix evenly, make rosin-based conductive adhesive, use shingle technology to stack BC cells together, bond adjacent BC cells with rosin-based conductive adhesive, bond BC cells into strings, put the stacked BC cells into ultraviolet curing equipment, perform ultraviolet curing treatment, lay a glass plate flat on an assembly table, evenly apply rosin-based adhesive on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles;

[0085] S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into a UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front side of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back side of the sample;

[0086] Furthermore, the use of shingling technology to partially overlap adjacent BC cells can effectively utilize the area of ​​the photovoltaic module and improve the conversion efficiency and power output of the photovoltaic module. Compared with the traditional cell connection method, the shingling technology can reduce the gap between cells, reduce the impact of shadows, improve the utilization of light energy, improve the power generation efficiency of the photovoltaic module, and improve the power generation performance of the photovoltaic tile;

[0087] BC cells are back-contact cells. BC cells place the PN junction and metal contact on the back of the cell, so that there is no electrode blocking the front of the cell, which solves the problem of light energy loss caused by traditional grid line blocking, ensures the maximum utilization of incident light, reduces optical loss, and enables BC cells to capture more incident light. Since there is no grid line blocking the front of the BC cell, the BC cell has a larger effective power generation area than traditional cells. Under the same lighting conditions, the BC cell can generate more electricity, further improving the power generation performance of photovoltaic tiles;

[0088] BC cells are bonded to each other with rosin-based conductive adhesive. Silver-coated copper powder makes the rosin-based conductive adhesive have excellent conductivity, ensuring smooth current transmission in photovoltaic tiles. Compared with pure silver powder, silver-coated copper powder has low cost, which can reduce the production cost of photovoltaic tiles. At the same time, the silver layer can prevent copper powder from being affected by environmental factors such as oxidation, thereby improving the durability of photovoltaic tiles. Silane coupling agents can form chemical bonds between inorganic materials and organic materials, improve the adhesion between cells and rosin-based conductive adhesive, and ensure the stability of photovoltaic tiles.

[0089] Example 6, please refer to Figure 1 and Figure 2, a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0090] S1. Preparation of maleopimaric acid epoxy resin: maleopimaric anhydride and epichlorohydrin are poured into a reaction container, tetrabutylammonium bromide is added into the reaction container, the reaction container is placed on a heating device, heated to 100° C., and stirred at the same time, sodium hydroxide solution is added dropwise into the reaction container, the reaction mixture is filtered, washed with deionized water, and the solvent and unreacted epichlorohydrin are removed under reduced pressure to obtain maleopimaric acid epoxy resin;

[0091] S2. Preparation of rosin-based adhesive: maleopimaric acid epoxy resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent are mixed, stirred evenly, and irradiated with UV lamp to obtain rosin-based adhesive.

[0092] Comparative Example 1, a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0093] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0094] S2. Preparation of rosin-based adhesive: Modified rosin-based resin, photoinitiator, active diluent, rosin crosslinking agent, adhesion-promoting monomer hydroxyethyl acrylate phosphate and leveling agent are mixed, stirred evenly, and irradiated with UV lamp to obtain rosin-based adhesive.

[0095] Comparative Example 2, a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0096] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0097] S2. Preparation of rosin-based adhesive: Modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, adhesion-promoting monomer hydroxyethyl acrylate phosphate and leveling agent are mixed, stirred evenly, and irradiated with UV lamp to obtain rosin-based adhesive.

[0098] Comparative Example 3, a rosin-based UV-curing assembly method, the UV-curing assembly method comprising the following steps:

[0099] S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin;

[0100] S2. Preparation of rosin-based adhesive: Modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent and leveling agent are mixed, stirred evenly, and irradiated with UV lamp to obtain rosin-based adhesive.

[0101] Performance Testing

[0102] Test 1: Adhesion performance test

[0103] The rosin-based adhesives obtained by assembling Example 1, Example 6, and Comparative Examples 1-3 were coated on a glass plate by an applicator to form a film, and the samples were placed in a UV curing machine for curing for 2 hours. The samples were taken out and the adhesion of the adhesive layer was measured by an automatic circle method adhesion tester, which was expressed in levels of 1-7, with level 1 being the best.

[0104] Test 2: Hardness performance test

[0105] The rosin-based adhesives obtained by assembling Example 1, Example 6, and Comparative Examples 1-3 were coated on a glass plate by an applicator to form a film, and the sample was placed in a UV curing machine for curing for 2 hours. A pencil was pressed on the adhesive layer at an angle of 45° for 5 times. If there were two or more scratches, the next pencil hardness model of this model was recorded. The test range was 4B-6H.

[0106] Test 3: Heat resistance test

[0107] The rosin-based adhesives obtained by assembling Example 1, Example 6, and Comparative Examples 1-3 were coated on a glass plate by an applicator to form a film, and the sample was placed in a UV curing machine for curing for 2 hours. The sample was placed in a thermal analyzer under the testing conditions of a nitrogen atmosphere and a heating rate of 20°C / min, and the temperature at which the sample lost 55% of its weight was recorded.

[0108] Table 1 Test results of adhesion performance test

[0109] Example Test Results Example 1 Level 1 Example 6 Level 3 Comparative Example 1 Level 3 Comparative Example 2 Level 2 Comparative Example 3 Level 3

[0110] Table 2 Test results of hardness performance test

[0111] Example Pencil hardness test value Example 1 4H Example 6 3H Comparative Example 1 3H Comparative Example 2 2H Comparative Example 3 3H

[0112] Table 3 Test results of heat resistance test

[0113]

[0114]

[0115] Working principle: by introducing the carboxyl functional group of methacrylic acid into maleopimaric acid epoxy resin, the modified rosin-based resin has good adhesion, heat resistance and other properties. Under the irradiation of ultraviolet light, the photoinitiator decomposes to produce active species such as free radicals or ions, which trigger the polymerization reaction of the double bonds in polyurethane acrylate and modified rosin-based resin, thereby achieving the curing of the adhesive.

[0116] The active diluent adjusts the viscosity and fluidity of the rosin-based adhesive, and the leveling agent improves the leveling property of the rosin-based adhesive, thereby ensuring that the rosin-based adhesive can be evenly coated on the glass plate and the battery cell. At the same time, the active diluent participates in the polymerization reaction and becomes a part of the molecular chain of the rosin-based adhesive.

[0117] Rosin crosslinkers react with the functional groups in the rosin-based adhesive molecules to form a crosslinked structure, thereby improving the strength and heat resistance of the adhesive. Adhesion-promoting monomers improve the adhesion between the rosin-based adhesive and the glass plate and battery cell, improve the adhesion performance of the adhesive, and ensure the firmness of the photovoltaic tiles. The battery cells use shingling technology to improve the conversion efficiency and power output of photovoltaic modules and improve the utilization rate of light energy.

[0118] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A rosin-based UV-curing assembly method, characterized in that: The UV-curing assembly method comprises the following steps: S1. Preparation of modified rosin-based resin: placing maleopimaric acid epoxy resin in a reaction container, heating the reaction container, and dropwise adding methacrylic acid, tetrabutylammonium bromide and hydroquinone into the reaction container to obtain modified rosin-based resin; S2. Preparation of rosin-based adhesive: Mix modified rosin-based resin, polyurethane acrylate, photoinitiator, reactive diluent, rosin crosslinking agent, adhesion promoting monomer and leveling agent, stir evenly, and irradiate with UV lamp to obtain rosin-based adhesive; S3, assembling photovoltaic tiles: lay a glass plate flat on an assembly table, apply rosin-based adhesive evenly on the glass plate, lay BC cells on the rosin-based adhesive, apply rosin-based adhesive again on top of the BC cells, lay another glass plate flat on the BC cells, and obtain photovoltaic tiles; S4. UV curing of photovoltaic tiles: put the assembled photovoltaic tiles into the UV curing machine, use UV light to irradiate the photovoltaic tiles, and after the front of the photovoltaic tiles is cured, turn the photovoltaic tiles over and use the UV curing machine to cure the back of the sample.

2. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The step S1 includes the following steps: S11. Preparation of maleopimaric acid epoxy resin: Step 1: Pour maleopimaric anhydride and epichlorohydrin into a reaction container, add tetrabutylammonium bromide into the reaction container, place the reaction container on a heating device, heat to 100° C., and stir; Step 2: Add sodium hydroxide solution dropwise to the reaction container, filter the reaction mixture, wash with deionized water, remove the solvent and unreacted epichlorohydrin under reduced pressure, and obtain maleopimaric acid epoxy resin.

3. The rosin-based UV-curing assembly method according to claim 2, characterized in that: The preparation method of maleopimaric anhydride in step 1 comprises the following steps: (1) grinding and crushing the rosin, placing the crushed rosin into a reaction container, filling the reaction container with nitrogen, and heating the reaction container; (2) Add glacial acetic acid, maleic anhydride and toluenesulfonic acid to a reaction container in sequence, stir the reaction using a stirring device, pour the reactants into an ice water bath to cool, filter, wash and purify the precipitated product to obtain maleopimaric anhydride.

4. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The S2 includes the following steps: S21. Preparation of polyurethane acrylate: Step 1: adding polytetrahydrofuran into a reaction container, filling the reaction container with nitrogen, heating the reaction container, sequentially adding diphenylmethane diisocyanate and dibutyltin dilaurate, and stirring with a stirring device to obtain a polyurethane prepolymer; Step 2: Mix the polyurethane prepolymer and hydroxyethyl methacrylate, and react at 50° C. for 2 hours to obtain polyurethane acrylate.

5. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The S3 includes the following steps: S31, preparation of rosin-based conductive adhesive: placing modified rosin-based resin in a reaction container, adding silver-coated copper powder, silane coupling agent and photoinitiator into the reaction container, stirring with a stirring device, mixing evenly, and preparing rosin-based conductive adhesive; S32. Connection of BC cells: Use shingling technology to stack the BC cells together. Adjacent BC cells are bonded together using rosin-based conductive adhesive. The BC cells are bonded into strings. The stacked BC cells are placed in a UV curing device for UV curing.

6. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The rosin crosslinking agent is rosin-based pentaerythritol triacrylate, and the preparation method of rosin-based pentaerythritol triacrylate comprises the following steps: (1) dissolving disproportionated rosin in ethanol, adding ethanolamine, extracting and recrystallizing to obtain dehydroabietic acid, dissolving dehydroabietic acid in dichloromethane, stirring, slowly adding thionyl chloride dropwise, and removing the solvent and excess thionyl chloride using a vacuum distillation apparatus to obtain dehydroabietic acid chloride; (2) dissolving dehydroabietic acid chloride in an acetone solution, stirring, and dropwise adding pentaerythritol triacrylate and 4-dimethylaminopyridine into the solution; (3) The reactant is centrifuged and the supernatant is washed to obtain rosin-based pentaerythritol triacrylate.

7. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The adhesion promoting monomer is hydroxyethyl acrylate phosphate.

8. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The active diluent is selected from one of styrene, methyl methacrylate, isobutyl acrylate and bisphenol A diacrylate.

9. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The S3 includes the following steps: S33, treatment of the glass plate: cleaning the glass plate with a detergent and clean water to remove impurities on the surface of the glass plate, and wiping the glass plate with a dry cloth to remove moisture on the surface of the glass plate; S34. Treatment of the assembly table: Use a level to calibrate the level of the assembly table, lay a layer of anti-slip material on the assembly table, and lay the glass plate flat on the anti-slip material.

10. The rosin-based UV-curing assembly method according to claim 1, characterized in that: The S4 includes the following steps: S41. Take out the cured photovoltaic tiles from the UV curing machine, let them stand for a while, check their appearance, clean their surface, and remove the rosin-based adhesive remaining on the surface.

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