Preparation method of double-sided tape for solar cell module

Abstract

The invention relates to the technical field of adhesive tapes, and particularly discloses a preparation method of a double-sided adhesive tape for a solar cell module. According to the invention, pinene-acrylonitrile copolymer resin is used as a tackifier, methyl methacrylate, butyl acrylate and dopamine methacrylamide are respectively used as a hard monomer, a soft monomer and a functional monomer, the adhesive is obtained after copolymerization reaction, and the adhesive is used for preparing the double-sided adhesive tape for the solar cell module. Under the combined action of the dopamine methacrylamide, the pinene-acrylonitrile copolymer resin, the methyl methacrylate and the butyl acrylate, the double-sided adhesive tape disclosed by the invention can show relatively high peel strength, can give full play to the good weather resistance of the polyacrylic acid adhesive, and is suitable for packaging of large solar cells.

Description

Technical Field

[0001] The present application relates to the technical field of adhesive tapes, and more specifically, to a method for preparing a double-sided adhesive tape for solar cell modules. Background Art

[0002] With the rapid development of science and technology and the increasing awareness of environmental protection, the construction and optimization of renewable energy and intelligent infrastructure have become important issues in today's society. Solar photovoltaic power generation system is a clean and renewable energy technology that converts sunlight into electrical energy. It mainly consists of key components such as solar panels, controllers, batteries and inverters. The solar panel is the core of the system and consists of a series of photovoltaic cells. When sunlight shines on the panel, the semiconductor material in the panel absorbs light energy and generates electron-hole pairs. These free electrons are guided out through an external circuit to generate current.

[0003] Solar cells are the core components of solar photovoltaic systems and are often placed outdoors to better receive sunlight. During use, solar cells are often exposed to harsh environments such as high temperature, high humidity, low temperature, and strong ultraviolet rays. Therefore, they need to be packaged to extend their service life. At present, double-sided tape is often used when packaging solar cells.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the double-sided tape commonly used on the market for encapsulating solar cells usually uses polyacrylic acid adhesive. Although polyacrylic acid adhesive has good weather resistance, its peel strength still needs to be improved and is not suitable for encapsulating large solar cells. Summary of the invention

[0005] The double-sided tape in the related art usually uses polyacrylic acid adhesive. Although polyacrylic acid adhesive has good weather resistance, its peel strength still needs to be improved and it is not suitable for packaging large solar cells. In order to improve this defect, the present application provides a method for preparing a double-sided tape for a solar cell module.

[0006] The present application provides a method for preparing a double-sided adhesive tape for a solar cell module, using the following technical solution: A method for preparing a double-sided adhesive tape for a solar cell module comprises the following steps: (1) under nitrogen protection conditions, unsaturated monomers, tackifying resins and emulsifiers are added to water and mixed, and a pre-emulsification treatment is performed by stirring to obtain a pre-emulsion for standby use; an initiator is added to water and mixed to obtain an initiator solution for standby use; the tackifying resin includes pinene-acrylonitrile copolymer resin, and the unsaturated monomer includes dopamine methacrylamide, butyl acrylate and methyl methacrylate; (2) taking a portion of the pre-emulsion and a portion of the initiator solution, mixing them, stirring and heating them under nitrogen protection conditions to obtain a seed emulsion, adding the remaining initiator solution and the pre-emulsion to the seed emulsion, and adding a silane coupling agent and ethylene glycol at the same time, cooling after heat preservation reaction, adjusting the pH value, filtering the material and mixing it with a reinforcing filler to obtain an adhesive; (3) Cutting the film substrate to obtain a substrate, coating the upper and lower surfaces of the substrate with a layer of backing adhesive, and then coating the surface of the backing adhesive with an adhesive, and after drying, laminating, and transferring, obtaining a double-sided adhesive tape for a solar cell module.

[0007] By adopting the above technical scheme, the present application uses pinene-acrylonitrile copolymer resin as a tackifier, and uses methyl methacrylate, butyl acrylate and dopamine methacrylamide as hard monomers, soft monomers and functional monomers respectively, and obtains an adhesive after copolymerization, and uses this adhesive to prepare a double-sided tape for solar cell modules. Dopamine methacrylamide has a catechol structure, and the catechol structure itself is easy to form hydrogen bonds, and can also be combined with the adherend through hydrogen bonds and coordination bonds, so that the adhesion between the adhesive and the adherend is more firm, and when subjected to external forces, the hydrogen bonds can be sacrificed to maintain the bond with the adherend. The pinene in the pinene-acrylonitrile copolymer resin has a good tackifying effect, and the strong polarity of acrylonitrile can produce a synergistic effect with the tackifying effect of pinene, so the pinene-acrylonitrile copolymer resin has a good tackifying ability. Under the combined action of dopamine methacrylamide, pinene-acrylonitrile copolymer resin, methyl methacrylate and butyl acrylate, the double-sided tape of the present application can exhibit strong peel strength and can give full play to the good weather resistance of polyacrylic acid adhesive, and is suitable for use in the packaging of large solar cells.

[0008] Preferably, the pinene-acrylonitrile copolymer resin is prepared according to the following method: Acrylonitrile, β-pinene and an initiator are added to ethylene dichloride and mixed to obtain a mother liquor, the mother liquor is deoxygenated, and then the mother liquor is heated in an oil bath. After the reaction is completed, the reaction liquid is poured into methanol for precipitation, and after standing overnight, it is filtered, and the filter cake is dried to obtain a pinene-acrylonitrile copolymer resin.

[0009] By adopting the above technical scheme, the present invention uses ethylene dichloride as a solvent and initiates free radical copolymerization of acrylonitrile and β-pinene through an initiator to obtain a pinene-acrylonitrile copolymer resin.

[0010] Preferably, in the method for preparing the pinene-acrylonitrile copolymer resin, Lewis acid and cumyl dithiobenzoate are further added to ethylene dichloride.

[0011] By adopting the above technical scheme, the present application carries out free radical copolymerization of acrylonitrile and β-pinene under the joint action of RAFT agent isopropyl dithiobenzoate and Lewis acid, which helps to increase the content of pinene groups in the pinene-acrylonitrile copolymer resin and helps to improve the viscosity-increasing effect of the pinene-acrylonitrile copolymer resin.

[0012] Preferably, the Lewis acid comprises zinc chloride or diethylaluminum chloride.

[0013] By adopting the above technical scheme, the present application preferably selects a specific type of Lewis acid, wherein diethylaluminum chloride can more fully increase the content of pinene groups in the pinene-acrylonitrile copolymer resin, which helps to improve the viscosity-increasing effect of the pinene-acrylonitrile copolymer resin.

[0014] Preferably, the molar ratio of the Lewis acid to butyl acrylate is 1:(10-15).

[0015] By adopting the above technical solution, the present application optimizes the molar ratio of Lewis acid to butyl acrylate, which helps to improve the viscosity-increasing effect of pinene-acrylonitrile copolymer resin.

[0016] Preferably, the weight ratio of the pinene-acrylonitrile copolymer resin to the unsaturated monomer is (0.5-0.65):1.

[0017] By adopting the above technical solution, the present application optimizes the weight ratio of pinene-acrylonitrile copolymer resin to unsaturated monomer, which helps to improve the viscosity-increasing effect of pinene-acrylonitrile copolymer resin.

[0018] Preferably, the dopamine methacrylamide is prepared according to the following method: (1) Mixing sodium borate, sodium bicarbonate, dopamine hydrochloride and deionized water to obtain a dopamine raw material solution for later use; adding methacrylic anhydride to tetrahydrofuran to obtain an anhydride solution for later use; preparing a sodium hydroxide solution for later use; (2) Under argon protection, sodium hydroxide solution and acid anhydride solution are added to dopamine raw material solution, and after heat preservation reaction, the solution is filtered, washed and acidified, and then extracted, and the obtained organic phase is dried with anhydrous magnesium sulfate to obtain a concentrated solution, and the concentrated solution is added to n-hexane and stirred, and the precipitate is collected, and dopamine methacrylamide is obtained after reduced pressure drying.

[0019] By adopting the above technical scheme, the present application uses catechol groups to protect the catechol groups in dopamine hydrochloride, then adds methacrylamide to react with the amino groups removed from the hydrochloric acid, and then removes the protecting groups of the phenolic hydroxyl groups to obtain dopamine methacrylamide.

[0020] Preferably, the molar ratio of dopamine methacrylamide to butyl acrylate is 1:(15-20).

[0021] By adopting the above technical solution, the present application optimizes the molar ratio of dopamine methacrylamide to butyl acrylate, which helps to improve the peel strength of the tape.

[0022] Preferably, the reinforcing filler comprises modified microcrystalline cellulose, and the modified microcrystalline cellulose is prepared according to the following method: The microcrystalline cellulose and the sulfuric acid solution are mixed, and then heated while stirring to obtain an acid hydrolyzate; ice water is added to the acid hydrolyzate to terminate the reaction, and then the solution is allowed to stand and wait for stratification to occur, and then the supernatant is removed, and the suspension at the bottom is centrifuged and washed to obtain a centrifuge; the centrifuge is dialyzed until the pH value is neutral to obtain a dialysate, and the dialysate is ultrasonically dispersed and freeze-dried to obtain modified microcrystalline cellulose.

[0023] By adopting the above technical solution, the present application further preferably includes a reinforcing filler comprising modified microcrystalline cellulose, and defines a method for preparing the modified microcrystalline cellulose. During the acid modification process, the hydrogen bonds of the microcrystalline cellulose are destroyed, the amorphous region is dissolved, and a modified microcrystalline cellulose having a large number of free hydroxyl groups on the surface is obtained. The modified microcrystalline cellulose can form a strong hydrogen bond with the catechol group, and can serve as a cross-linking point of the copolymer molecule, thereby making the bond between the adhesive and the adherend stronger, which helps to improve the peel strength of the tape.

[0024] Preferably, the amount of the modified microcrystalline cellulose is 2-5% of the total weight of the adhesive.

[0025] By adopting the above technical solution, the present application optimizes the amount of modified microcrystalline cellulose, which helps to improve the peel strength of the tape.

[0026] In summary, this application has the following beneficial effects: 1. This application uses pinene-acrylonitrile copolymer resin as a tackifier, and uses methyl methacrylate, butyl acrylate and dopamine methacrylamide as hard monomers, soft monomers and functional monomers respectively. After copolymerization, an adhesive is obtained, and this adhesive is used to prepare a double-sided tape for solar cell modules. Under the joint action of dopamine methacrylamide, pinene-acrylonitrile copolymer resin, methyl methacrylate and butyl acrylate, the double-sided tape of this application can show strong peel strength, and can give full play to the good weather resistance of polyacrylic acid adhesive, and is suitable for use in the packaging of large solar cells.

[0027] 2. The present application carries out free radical copolymerization of acrylonitrile and β-pinene under the joint action of RAFT agent isopropyl dithiobenzoate and Lewis acid, which helps to increase the content of pinene groups in the pinene-acrylonitrile copolymer resin and helps to improve the viscosity-increasing effect of the pinene-acrylonitrile copolymer resin.

[0028] 3. The present application preferably uses reinforcing fillers including modified microcrystalline cellulose, which can form strong hydrogen bonds with catechol groups and can serve as cross-linking points of copolymer molecules, thereby making the bond between the adhesive and the adherend stronger and helping to improve the peel strength of the tape. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially.

[0030] Preparation Example of Pinene-Acrylonitrile Copolymer Resin

[0031] The following is an explanation using Preparation Example 1.

[0032] Preparation Example 1 In this preparation example, pinene-acrylonitrile copolymer resin was prepared according to the following method: Acrylonitrile, β-pinene and initiator AIBN were weighed in a molar ratio of 1:1:0.002, and acrylonitrile, β-pinene and initiator AIBN were added to ethylene dichloride under nitrogen protection to obtain a mother liquor; before mixing, the volume ratio of acrylonitrile to ethylene dichloride was 1:4; the mother liquor was deoxygenated, and then heated in an oil bath at 60°C for 72 hours. After the reaction was completed, the reaction solution was poured into methanol for precipitation, and filtered after standing overnight, and the filter cake was dried to obtain pinene-acrylonitrile copolymer resin.

[0033] Preparation Example 2 The difference between this preparation example and preparation example 1 is that in the method for preparing the pinene-acrylonitrile copolymer resin, Lewis acid and cumyl dithiobenzoate are also added to ethylene dichloride, the Lewis acid is zinc chloride, the molar ratio of Lewis acid to acrylonitrile is 1:20, and the molar ratio of cumyl dithiobenzoate to acrylonitrile is 1:50.

[0034] Preparation Example 3 The difference between this preparation example and preparation example 2 is that diethylaluminum chloride is used as the Lewis acid.

[0035] As shown in Table 1, the difference between Preparation Example 5 and Preparation Examples 4-6 is that the molar ratio of Lewis acid to acrylonitrile is different.

[0036] Table 1 Molar ratio of Lewis acid to acrylonitrile

[0037] sample Lewis acid: acrylonitrile Preparation Example 3 1:20 Preparation Example 4 1:15 Preparation Example 5 1:12 Preparation Example 6 1:10 Preparation Example of Dopamine Methacrylamide The following is an explanation using Preparation Example 7.

[0038] Preparation Example 7 In this preparation example, dopamine methacrylamide was prepared according to the following method:

[0039] (1) 40 g of sodium borate, 16 g of sodium bicarbonate, 20 g of dopamine hydrochloride and 400 g of deionized water were mixed to obtain a dopamine raw material solution, which was set aside; 18.8 mL of methacrylic anhydride was added to 100 mL of tetrahydrofuran to obtain an anhydride solution, which was set aside; 1 mol / L of sodium hydroxide solution was prepared, which was set aside; (2) Under argon protection, sodium hydroxide solution and acid anhydride solution were added to the dopamine raw material solution. After keeping the temperature at 25°C for 16 hours, the solution was filtered and washed and acidified (the pH was adjusted to 1.5 using concentrated hydrochloric acid). Then, the solution was extracted with ethyl acetate. After the extraction, the organic phase was dried with anhydrous magnesium sulfate. After 8 hours, the magnesium sulfate was removed by filtration and rotary evaporated at 35°C using a rotary evaporator to obtain 150 mL of concentrated solution. The concentrated solution was added to 1000 mL of n-hexane and stirred. The precipitate was collected and dried under reduced pressure for 24 hours to obtain dopamine methacrylamide.

[0040] Preparation example of modified microcrystalline cellulose

[0041] The following is an explanation using Preparation Example 8.

[0042] Preparation Example 8 In this preparation example, modified microcrystalline cellulose was prepared according to the following method: 100 g of microcrystalline cellulose and 1500 mL of a 60 wt % sulfuric acid solution were mixed, stirred and heated at 50° C., and a cellulose hydrolysate was obtained after 75 minutes; ice water 10 times the weight of the cellulose hydrolysate was added to the cellulose hydrolysate to terminate the reaction, and then the mixture was allowed to stand overnight and wait for stratification, and after stratification, the supernatant was removed, and the suspension at the bottom was centrifuged to obtain a centrifuge; the centrifuge was dialyzed to a pH value of 7.0 to obtain a dialysate, and the dialysate was ultrasonically dispersed and freeze-dried to obtain modified microcrystalline cellulose.

[0043] Example

[0044] Examples 1-5 The following description is given by taking Example 1 as an example.

[0045] Example 1

[0046] In this embodiment, the tackifying resin is the pinene-acrylonitrile copolymer resin of Preparation Example 1, and the weight ratio of the pinene-acrylonitrile copolymer resin to the unsaturated monomer is 0.4:1; the unsaturated monomer is composed of dopamine methacrylamide, butyl acrylate and methyl methacrylate, and the dopamine methacrylamide is prepared according to the method of Preparation Example 7, the molar ratio of dopamine methacrylamide to butyl acrylate is 1:22, and the molar ratio of methyl methacrylate to butyl acrylate is 1:8. The initiator is APS, and the amount of the initiator APS is 0.5% of the total weight of the unsaturated monomer. The emulsifier is a mixture of OP-10 and SDS in a weight ratio of 2:1, and the amount of the emulsifier is 1.5% of the total weight of the unsaturated monomer. The silane coupling agent is 3-methacryloxypropyl trimethoxysilane, and the amount is 2% of the total weight of the unsaturated monomer, and the amount of ethylene glycol is 3% of the total weight of the unsaturated monomer.

[0047] This embodiment provides a method for preparing a double-sided adhesive tape for a solar cell module, comprising the following steps: (1) Under nitrogen protection, unsaturated monomer, tackifying resin and emulsifier are added to 600 mL of water and mixed, and a pre-emulsification treatment is performed by stirring to obtain a pre-emulsion for use; initiator APS is added to water and mixed, and sodium bicarbonate is added to adjust the pH to 5 to obtain a total of 30 mL of initiator solution with an APS mass fraction of 20%, which is set aside; (2) Mix 200 mL of the pre-emulsion and 10 mL of the initiator solution, maintain the temperature at 85°C under nitrogen protection, stir at a rate of 400 r / min, and obtain a seed emulsion after 3 hours. Add the remaining initiator solution and the remaining half of the pre-emulsion to the seed emulsion, and add a silane coupling agent and ethylene glycol at the same time. After 2 hours of heat preservation reaction, cool to 20°C, adjust the pH value to 7.5, and filter the material to obtain an adhesive; (3) The film substrate is cut to obtain a substrate, a layer of backing glue is coated on the upper and lower surfaces of the substrate, and then an adhesive is coated on the surface of the backing glue at a coating speed of 15 m / min. After drying, compounding and transferring, a double-sided tape for solar cell modules is obtained, and the single-sided adhesive film thickness of the tape is 0.1 mm.

[0048] As shown in Table 2, the main difference between Examples 1-6 is that the preparation examples of pinene-acrylonitrile copolymer resin are different.

[0049] Table 2 Preparation example of pinene-acrylonitrile copolymer resin sample Preparation Example Example 1 Preparation Example 1 Example 2 Preparation Example 2 Example 3 Preparation Example 3 Example 4 Preparation Example 4 Example 5 Preparation Example 5 Example 6 Preparation Example 6 As shown in Table 3, the difference between Example 6 and Examples 7-9 is that the weight ratio of pinene-acrylonitrile copolymer resin to unsaturated monomer (referred to as tackifier:monomer) is different.

[0050] Table 3 Weight ratio of pinene-acrylonitrile copolymer resin to unsaturated monomer sample Tackifier: Monomer Example 6 0.4:1 Example 7 0.5:1 Example 8 0.6:1 Example 9 0.65:1 As shown in Table 4, the difference between Example 9 and Examples 10-12 is that the molar ratio of dopamine methacrylamide to butyl acrylate (referred to as monomer ratio) is different.

[0051] Table 4 Monomer ratio sample Monomer ratio Example 9 1:22 Example 10 1:20 Embodiment 11 1:18 Example 12 1:15 Embodiment 13

[0052] The difference between this embodiment and embodiment 12 is that the reinforcing filler includes modified microcrystalline cellulose, the modified microcrystalline cellulose is prepared according to the method of preparation example 8, and the amount of the modified microcrystalline cellulose accounts for 1% of the total weight of the adhesive.

[0053] As shown in Table 5, the difference between Examples 13-16 is that the percentage of the amount of modified microcrystalline cellulose in the total weight of the binder (referred to as modified microcrystalline cellulose percentage in Table 5) is different.

[0054] Table 5 Dosage of modified microcrystalline cellulose sample Modified microcrystalline cellulose proportion / % Embodiment 13 1 Embodiment 14 2 Embodiment 15 4 Example 16 5 Comparative Example

[0055] Comparative Example 1 This comparative example provides an adhesive tape for a solar cell module, which is prepared with reference to Example 1 of the Chinese patent publication number CN 102816536A.

[0056] Comparative Example 2 The difference between this comparative example and Example 1 is that the tackifying resin is replaced with a terpene resin at a weight ratio of 1:1.

[0057] Comparative Example 3 The difference between this comparative example and Example 1 is that dopamine methacrylamide is replaced by methacrylamide at a molar ratio of 1:1.

[0058] Performance testing methods

[0059] With reference to the description in GB / T 2792-2014 Test method for peel strength of adhesive tape, the 180° peel strength of the adhesive tapes of the embodiments and comparative examples was tested. The results are shown in Table 6.

[0060] Table 6 180° peel strength sample Peel strength / (N / m) sample Peel strength / (N / m) Example 1 462 Embodiment 11 486 Example 2 466 Example 12 487 Example 3 469 Embodiment 13 493 Example 4 471 Embodiment 14 497 Example 5 474 Embodiment 15 499 Example 6 475 Example 16 504 Example 7 477 Comparative Example 1 389 Example 8 480 Comparative Example 2 414 Example 9 482 Comparative Example 3 405 Example 10 484 / / Combining Example 1 and Comparative Example 1 and Table 6, it can be seen that the peel strength measured in Example 1 is significantly higher than that in Comparative Example 1. This is because the tape of Example 1 exhibits strong peel strength under the combined action of dopamine methacrylamide, pinene-acrylonitrile copolymer resin, methyl methacrylate, and butyl acrylate. Based on this feature, the double-sided tape of the present application can exhibit strong peel strength and can give full play to the good weather resistance of polyacrylic acid adhesive, and is suitable for use in the packaging of large solar cells.

[0061] Combining Example 1 and Comparative Example 2 with Table 6, it can be seen that the peel strength measured in Comparative Example 2 is lower than that in Example 1. This is because in Example 1, the strong polarity of acrylonitrile can synergize with the tackifying effect of pinene, thereby improving the tackifying effect of the tackifying resin. Although Comparative Example 2 contains a terpene group similar to pinene, it lacks the coordination of acrylonitrile, resulting in limited tackifying effect. Therefore, the synergistic effect between the tackifying resin and the catechol structure is also relatively limited, resulting in a lower peel strength in Comparative Example 2.

[0062] Combining Example 1 and Comparative Example 3 and Table 6, it can be seen that the peel strength measured in Comparative Example 3 is lower than that in Example 1. This is because the adhesive in Comparative Example 3 lacks the catechol group that provides bonding performance, and cannot achieve good synergistic effect between the catechol structure and the tackifying resin, resulting in a lower peel strength in Comparative Example 3.

[0063] It can be seen from Examples 1-3 and Table 6 that the pinene-acrylonitrile copolymer resin prepared with the participation of Lewis acid and cumyl dithiobenzoate can more effectively improve the peel strength of the tape. Among them, diethylaluminum chloride has a relatively good effect.

[0064] Combining Examples 3-6 and Table 6, it can be seen that when the molar ratio of Lewis acid to butyl acrylate is 1:(10-15), the peel strength of the tape is relatively high, indicating that the synergistic effect of the tackifying resin itself and the synergistic effect with the catechol group can be fully exerted.

[0065] Combining Examples 6-9 and Table 6, it can be seen that when the weight ratio of pinene-acrylonitrile copolymer resin to unsaturated monomer is (0.5-0.65):1, the peel strength of the tape is relatively high, indicating that the synergistic effect of the tackifying resin itself and the synergistic effect with the catechol group can be fully exerted.

[0066] Combining Examples 9-12 and Table 6, it can be seen that when the molar ratio of dopamine methacrylamide to butyl acrylate is 1:(15-20), the peel strength of the tape is relatively high, indicating that the synergistic effect between the tackifying resin and the catechol group can be fully exerted at this time.

[0067] Combining Example 12, Examples 13-16 and Table 6, it can be seen that the peel strengths measured in Examples 13-16 are all higher than that in Example 12. This is because the modified microcrystalline cellulose can form strong hydrogen bonds with the catechol groups and can serve as crosslinking points of the copolymer molecules, thereby making the bond between the adhesive and the adherend stronger, which helps to improve the peel strength of the tape. Among them, the peel strengths of Examples 14-16 are relatively high, indicating that when the amount of modified microcrystalline cellulose accounts for 2-5% of the total weight of the adhesive, the addition of modified microcrystalline cellulose helps to fully improve the peel strength of the tape.

[0068] The above embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the embodiments of the present application without any creative contribution as needed. However, as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a double-sided adhesive tape for a solar cell module, characterized in that: The following steps are involved: (1) under nitrogen protection conditions, unsaturated monomers, tackifying resins and emulsifiers are added to water and mixed, and a pre-emulsification treatment is performed by stirring to obtain a pre-emulsion for standby use; an initiator is added to water and mixed to obtain an initiator solution for standby use; the tackifying resin includes pinene-acrylonitrile copolymer resin, and the unsaturated monomer includes dopamine methacrylamide, butyl acrylate and methyl methacrylate; (2) taking a portion of the pre-emulsion and a portion of the initiator solution, mixing them, stirring and heating them under nitrogen protection conditions to obtain a seed emulsion, adding the remaining initiator solution and the pre-emulsion to the seed emulsion, and adding a silane coupling agent and ethylene glycol at the same time, cooling after heat preservation reaction, adjusting the pH value, filtering the material and mixing it with a reinforcing filler to obtain an adhesive; (3) Cutting the film substrate to obtain a substrate, coating the upper and lower surfaces of the substrate with a layer of backing adhesive, and then coating the surface of the backing adhesive with an adhesive, and after drying, laminating, and transferring, obtaining a double-sided adhesive tape for a solar cell module.

2. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 1, characterized in that: The pinene-acrylonitrile copolymer resin is prepared according to the following method: Acrylonitrile, β-pinene and an initiator are added to ethylene dichloride and mixed to obtain a mother liquor, the mother liquor is deoxygenated, and then the mother liquor is heated in an oil bath. After the reaction is completed, the reaction liquid is poured into methanol for precipitation, and after standing overnight, it is filtered, and the filter cake is dried to obtain a pinene-acrylonitrile copolymer resin.

3. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 2, characterized in that: In the method for preparing the pinene-acrylonitrile copolymer resin, Lewis acid and cumyl dithiobenzoate are also added to ethylene dichloride.

4. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 3, characterized in that: The Lewis acid includes zinc chloride or diethylaluminum chloride.

5. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 4, characterized in that: The molar ratio of the Lewis acid to butyl acrylate is 1:(10-15).

6. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 3, characterized in that: The weight ratio of the pinene-acrylonitrile copolymer resin to the unsaturated monomer is (0.5-0.65):

1.

7. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 1, characterized in that: The dopamine methacrylamide is prepared according to the following method: (1) Mixing sodium borate, sodium bicarbonate, dopamine hydrochloride and deionized water to obtain a dopamine raw material solution for later use; adding methacrylic anhydride to tetrahydrofuran to obtain an anhydride solution for later use; preparing a sodium hydroxide solution for later use; (2) Under argon protection, sodium hydroxide solution and acid anhydride solution are added to dopamine raw material solution, and after heat preservation reaction, the solution is filtered, washed and acidified, and then extracted. The obtained organic phase is dried with anhydrous magnesium sulfate to obtain a concentrated solution, the concentrated solution is added to n-hexane and stirred, and the precipitate is collected. After reduced pressure drying, dopamine methacrylamide is obtained.

8. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 7, characterized in that: The molar ratio of dopamine methacrylamide to butyl acrylate is 1:(15-20).

9. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 1, characterized in that: The reinforcing filler comprises modified microcrystalline cellulose, and the modified microcrystalline cellulose is prepared according to the following method: The microcrystalline cellulose and sulfuric acid solution are mixed, stirred and heated to obtain a cellulose acid hydrolysate; ice water is added to the cellulose acid hydrolysate to terminate the reaction, and the solution is allowed to stand for stratification, and after removing the supernatant, the suspension at the bottom is centrifuged and washed to obtain a centrifuge; the centrifuge is dialyzed until the pH value is neutral to obtain a dialysate, and the dialysate is ultrasonically dispersed and freeze-dried to obtain modified microcrystalline cellulose.

10. The method for preparing a double-sided adhesive tape for a solar cell module according to claim 9, characterized in that: The amount of the modified microcrystalline cellulose is 2-5% of the total weight of the adhesive.