Easily-disassembled adhesive film, preparation method thereof, photovoltaic module and disassembly method of retired photovoltaic module

Abstract

The invention relates to the field of adhesive films, in particular to an adhesive film easy to disassemble, a preparation method of the adhesive film easy to disassemble, a photovoltaic module and a disassembling method of a retired photovoltaic module. The easy-to-disassemble photovoltaic module adhesive film provided by the invention is prepared from the following raw materials: resin, a cross-linking agent TB, a cross-linking agent TA, an assistant cross-linking agent, a coupling agent and a foaming agent which are matched according to a certain proportion, wherein the foaming agent is at least one of a foaming agent ADC, a foaming agent H, nitroguanidine, a foaming agent RA and a foaming agent THT; the cross-linking agent TB is tert-butyl peroxide carbonic acid-2-ethyl hexyl ester; the cross-linking agent TA is peroxide (2-ethylhexyl) tert-amyl carbonate. The easy-to-disassemble adhesive film disclosed by the invention can be used for controlling failure after the photovoltaic module is decommissioned, so that the stripping difficulty of module glass and a battery piece is reduced, and the recovery efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of adhesive films, and particularly to an easily disassembled adhesive film and its preparation method, a photovoltaic module, and a disassembly method for retired photovoltaic modules. Background Art

[0002] In recent years, China has become the world's largest photovoltaic application market, and in the future, a large number of retired photovoltaic modules will be faced. How to properly handle them has become an urgent problem to be solved. One of the biggest difficulties in the retirement and recycling of photovoltaic modules is the separation of inorganic and organic substances. Currently, all component encapsulation processes use polymer adhesive films to bond solar cells and glass. For the sake of ensuring work efficiency, the adhesive film has the characteristics of firm adhesion and not being easily aged. However, these properties often still exist after the module is retired, which creates great difficulties for the recycling and disassembly process.

[0003] Currently, the disassembly methods for retired photovoltaic modules mainly include physical recovery method, thermal recovery method, chemical recovery method, etc. Among them, the physical recovery method directly cuts and crushes the module, with a simple process but low recovery efficiency; the thermal recovery method softens or directly decomposes the adhesive film by heating, with the disadvantages of high energy consumption, easy generation of waste gas during the recovery process and still having residues of the adhesive film; the chemical recovery method uses a solvent to swell or dissolve the adhesive film at a specific temperature to achieve the purpose of separating the solar cell and the glass, and then uses nitric acid, potassium hydroxide, etc. to recover the precious metals on the solar cell. The disadvantages are long reaction time, large amount of solvent and generation of secondary pollutants such as waste liquid, which is not conducive to large-scale production. Summary of the Invention

[0004] In view of this, the present invention provides an easily disassembled adhesive film and its preparation method, a photovoltaic module, and a disassembly method for retired photovoltaic modules. The easily disassembled adhesive film provided by the present invention can be controlled to fail after the photovoltaic module is retired, so that the bonding strength of the retired module adhesive film can be controllably reduced, the peeling difficulty between the module glass and the solar cell can be reduced, the recovery efficiency can be improved, and in addition, the heating energy consumption can be reduced, the amount of chemical solvent used can be reduced, and the time consumption can be reduced.

[0005] The present invention provides an easily disassembled adhesive film, and its preparation raw materials include:

[0006] Resin;

[0007] Crosslinking agent TB, with a dosage of 0.2 wt% - 1 wt% of the resin;

[0008] Crosslinking agent TA, with a dosage of 0.02 wt% - 0.2 wt% of the resin;

[0009] Co-crosslinking agent, with a dosage of 0.2 wt% - 1 wt% of the resin;

[0010] Coupling agent, with a dosage of 0.2 wt% to 1 wt% of the resin;

[0011] Blowing agent, with a dosage of 0.5 wt% to 8 wt% of the resin;

[0012] Among them,

[0013] The blowing agent is at least one of blowing agent ADC, blowing agent H, nitroguanidine, blowing agent RA, and blowing agent THT;

[0014] The crosslinking agent TB is tert-butyl peroxycarbonate-2-ethylhexyl ester;

[0015] The crosslinking agent TA is tert-amyl peroxy (2-ethylhexyl) carbonate.

[0016] Preferably, the resin is EVA resin and / or POE resin.

[0017] Preferably, the co-crosslinking agent is TAIC.

[0018] Preferably, the EVA resin is at least one of the models 2825 and 28150;

[0019] The POE resin is at least one of the models 8660 and 8669.

[0020] The present invention also provides a method for preparing the easily disassembled adhesive film described in the above technical solution, including:

[0021] (A) Blending the resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent, and blowing agent to obtain a blended material;

[0022] (B) Kneading, melting, and casting the blended material into a film to obtain the easily disassembled adhesive film.

[0023] Preferably, in step (B), the melting is carried out in a single-screw extruder;

[0024] The conditions of the single-screw extruder are set as follows: the temperatures of each section of the barrel are set to 75 - 95 °C, 75 - 95 °C, 78 - 98 °C, 78 - 98 °C, 78 - 98 °C, the temperature of the die head is set to 75 - 95 °C, and the screw speed is 30 - 50 r / min.

[0025] Preferably, the thickness of the adhesive film obtained in step (B) is 300 - 500 μm;

[0026] The temperature of the kneading is 78 - 98 °C;

[0027] In step (A), the rotation speed of the blending is 60 - 120 rpm, and the time is 20 - 40 min.

[0028] The present invention also provides a photovoltaic module, wherein the adhesive film is the easily disassembled adhesive film described in the above technical solution or is prepared by the preparation method described in the above technical solution.

[0029] The present invention also provides a method for disassembling a retired photovoltaic module, comprising: heating the retired photovoltaic module to strip the module;

[0030] Wherein, the retired photovoltaic module is a retired part of the photovoltaic module described in the above technical solution.

[0031] Preferably, the heating temperature is 180-220 °C.

[0032] The present invention combines resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent and foaming agent in a certain proportion to prepare a bonding adhesive film with controllable failure, which can be controlled to fail after the photovoltaic module is retired. Specifically, heating the retired photovoltaic module can trigger the foaming of the adhesive film, a large number of bubbles are formed in the adhesive film, and the bonding strength also drops greatly. Moreover, the adhesive film body is also close to the viscous flow state when heated, greatly reducing the difficulty of peeling, and the module can be easily peeled without damaging the glass and battery chips of the module. After disassembling, chemical solvent immersion can be carried out to remove the residual adhesive film on the surfaces of the glass and battery chips. Since the most difficult part of disassembling the glass and battery chips has been completed, a large amount of time can be saved and the amount of chemical solvent can be reduced during the immersion stage. Therefore, using the adhesive film of the present invention for recycling operations can save heating energy consumption, reduce the amount of chemical solvent, and improve the operation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0034] Figure 1 It is a schematic diagram of the heating situation during the disassembly process of a retired photovoltaic module using the adhesive film of the present invention; among them, the three samples from left to right respectively correspond to the adhesive film of Example 2, the adhesive film of Example 1, and the adhesive film of Example 3;

[0035] Figure 2 It is a schematic diagram before heating during the disassembly process of a retired photovoltaic module using the adhesive film of Example 1 of the present invention;

[0036] Figure 3 It is a schematic diagram after heating during the disassembly process of a retired photovoltaic module using the adhesive film of Example 1 of the present invention;

[0037] Figure 4Schematic diagram before heating during the disassembly process of retired photovoltaic modules using the adhesive film of Embodiment 2 of the present invention. Detailed implementation mode

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] In this article, among the technically characterized described in an open-ended manner, there are included closed technical solutions composed of the listed features, as well as open technical solutions including the listed features.

[0040] The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] In this article, regarding numerical ranges, unless otherwise specified, the above numerical ranges are considered continuous and include the minimum and maximum values of this range, as well as each value between such minimum and maximum values. Further, when the range refers to integers, it includes each integer between the minimum and maximum values of this range. In addition, when providing multiple ranges to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0042] In this article, regarding the units of data ranges, if the unit is only attached after the right endpoint, it means that the units of the left endpoint and the right endpoint are the same. For example, 300 - 500 μm means that the units of the left endpoint "300" and the right endpoint "500" are both μm.

[0043] The present invention provides an easily disassembled adhesive film, and its preparation raw materials include:

[0044] Resin;

[0045] Crosslinking agent TB, with a dosage of 0.2 wt% - 1 wt% of the resin;

[0046] Crosslinking agent TA, with a dosage of 0.02 wt% - 0.2 wt% of the resin;

[0047] Co-crosslinking agent, with a dosage of 0.2 wt% - 1 wt% of the resin;

[0048] Coupling agent, with a dosage of 0.2 wt% - 1 wt% of the resin;

[0049] Foaming agent, with a dosage of 0.5 wt% - 8 wt% of the resin;

[0050] Among them,

[0051] The blowing agent is at least one of blowing agent ADC, blowing agent H, nitroguanidine, blowing agent RA, and blowing agent THT;

[0052] The crosslinking agent TB is tert-butyl peroxycarbonate-2-ethylhexyl ester;

[0053] The crosslinking agent TA is t-amyl peroxy (2-ethylhexyl) carbonate.

[0054] The easily disassembled adhesive film provided by the present invention, more specifically, is an easily disassembled photovoltaic module adhesive film. A certain proportion of polymer blowing agent is added to the adhesive film formula. During the disassembly stage of the glass and battery cells of the retired module, the high-temperature foaming principle is utilized to generate a large number of bubbles inside the adhesive film to reduce the adhesive force of the adhesive film, so as to achieve the effect of facilitating disassembly without damaging the overall structure of the module.

[0055] In the present invention, the resin is the adhesive film matrix, in the form of resin particles, preferably EVA resin and / or POE resin. Among them, EVA and POE are the abbreviations of well-known substances in the art, representing ethylene-vinyl acetate copolymer and polyolefin elastomer respectively. Among them, the EVA resin is preferably an EVA resin with a VA content (i.e., vinyl acetate) of 25% to 30%, more preferably at least one of the models 2825 and 28150. The POE resin is preferably at least one of the models 8660 and 8669. The present invention has no special restrictions on the source of the resin, and it can be a commercially available product.

[0056] In the present invention, the crosslinking agent TB refers to tert-butyl peroxycarbonate-2-ethylhexyl ester. In the present invention, the dosage of the crosslinking agent TB is 0.2 wt% to 1 wt% of the resin, specifically 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1.0 wt%.

[0057] In the present invention, the crosslinking agent TA refers to t-amyl peroxy (2-ethylhexyl) carbonate. In the present invention, the dosage of the crosslinking agent TA is 0.02 wt% to 0.2 wt% of the resin, specifically 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.10 wt%, 0.11 wt%, 0.12 wt%, 0.13 wt%, 0.14 wt%, 0.15 wt%, 0.16 wt%, 0.17 wt%, 0.18 wt%, 0.19 wt%, 0.20 wt%.

[0058] In the present invention, the co-crosslinking agent is preferably TAIC (i.e., triallyl isocyanurate). In the present invention, the dosage of the co-crosslinking agent is 0.2 wt% to 1 wt% of the resin, and specifically can be 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1.0 wt%.

[0059] In the present invention, the coupling agent is preferably KH-570. In the present invention, the dosage of the coupling agent is 0.2 wt% to 1 wt% of the resin, and specifically can be 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1.0 wt%.

[0060] In the present invention, the blowing agent is at least one of blowing agent ADC (i.e., azodicarbonamide), blowing agent H (dinitrosopentamethylenetetramine), nitroguanidine, blowing agent RA (i.e., p-toluenesulfonyl semicarbazide), and blowing agent THT (i.e., trihydrazinotriazine), and more preferably blowing agent ADC. The present invention has no special restrictions on the source of the blowing agent, and it can be a commercially available product or prepared according to known preparation methods in the art. In the present invention, the dosage of the blowing agent is 0.5 wt% to 8 wt% of the resin, and specifically can be 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, 3.0 wt%, 3.5 wt%, 4.0 wt%, 4.5 wt%, 5.0 wt%, 5.5 wt%, 6.0 wt%, 6.5 wt%, 7.0 wt%, 7.5 wt%, 8.0 wt%, and more preferably 4 wt% to 5 wt%.

[0061] The present invention also provides a preparation method of the easily disassembled adhesive film described in the above technical solution, including:

[0062] (A) Mixing the resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent, and blowing agent to obtain a mixture;

[0063] (B) Kneading, melting, and casting the mixture into a film to obtain the easily disassembled adhesive film.

[0064] Among them, the types and dosages of the resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent, and blowing agent are the same as those described in the previous technical solution, and will not be elaborated here one by one.

[0065] Regarding step (A):

[0066] There is no special limitation on the blending method, and it can be carried out according to the conventional blending methods in the art, such as stirring and mixing. The rotation speed of the blending is preferably 60-120 rpm, specifically it can be 60 rpm, 70 rpm, 80 rpm, 90 rpm, 100 rpm, 110 rpm, 120 rpm. The blending time is preferably 20-40 min, specifically it can be 20 min, 30 min, 40 min, and more preferably 30 min.

[0067] Regarding step (B):

[0068] The temperature of the kneading is preferably 78-98 °C, specifically it can be 78 °C, 80 °C, 85 °C, 90 °C, 95 °C, 98 °C. In the present invention, the melting is preferably carried out in a single-screw extruder. The conditions of the single-screw extruder are preferably set as follows: the temperatures of each section of the barrel are set to 75-95 °C, 75-95 °C, 78-98 °C, 78-98 °C, 78-98 °C, and the temperature of the die head is set to 75-95 °C, and the screw rotation speed is 30-50 r / min. Specifically, the temperatures of each section of the single-screw extruder are adjusted to 70-90 °C for preheating. After reaching the preheating temperature, the temperatures of each section of the barrel are set to 75-95 °C, 75-95 °C, 78-98 °C, 78-98 °C, 78-98 °C, and the temperature of the die head is set to 75-95 °C. In the present invention, step (B) can be carried out in a casting machine. Specifically, the mixed material is fed into the casting machine, first kneaded, then fed into the single-screw extruder unit to be melted into a plastic stream, and then extruded into a film through the casting die head. The thickness of the obtained rubber film is preferably 300-500 μm, specifically it can be 300 μm, 350 μm, 400 μm, 450 μm, 500 μm.

[0069] The present invention also provides a photovoltaic module, wherein the rubber film is the easily disassembled rubber film described in the above technical solution or is prepared by the preparation method described in the above technical solution.

[0070] The present invention also provides a method for disassembling a retired photovoltaic module, including: heating the retired photovoltaic module and peeling off the module; wherein, the retired photovoltaic module is the retired part of the photovoltaic module described in the above technical solution.

[0071] Among them, the heating temperature is preferably 180-220°C, specifically it can be 180°C, 190°C, 200°C, 210°C, 220°C, and more preferably 200°C. In the present invention, after heating, the chemical function of the foaming agent in the component is triggered, causing the adhesive film to foam and expand. The bonding density between components such as glass and solar cells is greatly reduced, thereby reducing the bonding strength and making the disassembly difficulty significantly reduced. The glass and solar cells can be easily separated, and the glass and solar cells can be separated by simple peeling. In the present invention, after disassembling the glass and solar cells, it is preferably also subjected to chemical solvent immersion to remove the residual adhesive film on the surfaces of the glass and solar cells. The present invention has no special limitation on the type of chemical solvent used, and any conventional solvent in the chemical recycling method in the art can be used. Since the most difficult part of disassembling the glass and solar cells has been completed, a large amount of time can be saved and the amount of chemical solvent used can be reduced in the soaking stage.

[0072] The present invention mixes resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent and foaming agent in a certain proportion to prepare a bonding adhesive film with controllable failure, which can be controlled to fail after the photovoltaic module is retired. Specifically, heating the retired photovoltaic module can trigger the foaming of the adhesive film, a large number of bubbles are formed in the adhesive film, and the bonding strength also drops significantly. At the same time, the adhesive film body is close to the viscous flow state when heated, making the peeling difficulty greatly reduced, and the module can be easily peeled off without damaging the glass and solar cells of the module. After disassembly, chemical solvent immersion can be carried out to remove the residual adhesive film on the surfaces of the glass and solar cells. Since the most difficult part of disassembling the glass and solar cells has been completed, a large amount of time can be saved and the amount of chemical solvent used can be reduced in the soaking stage. Therefore, using the adhesive film of the present invention for recycling operations can save heating energy consumption, reduce the amount of chemical solvent used, and improve the operation rate.

[0073] Currently, it is difficult to peel off the industrial-produced adhesive film as a whole unless it undergoes chemical or high-temperature treatment. In the prior art, the disassembly of photovoltaic modules is mainly studied from the disassembly stage after the modules are retired to figure out how to disassemble them. However, the present invention starts from the stage of preparing the adhesive film, processes the adhesive film so that it can be controlled to fail, omits high-temperature operations and performs limited chemical treatments, overcomes the disadvantages of high energy consumption and long reaction time, and improves the overall recycling efficiency. Moreover, the adhesive film prepared by the present invention will not have an adverse impact on the preparation and use of photovoltaic modules. Specifically: In the process of preparing the adhesive film of the present invention, certain raw materials are used in a certain proportion, especially a certain amount of foaming agent with good compatibility with other components is introduced. The foaming temperature is above 200°C, while the lamination temperature of the adhesive film is generally about 150°C, so it does not affect the lamination process of the adhesive film; the foaming agent is in the form of powdery microparticles, and since the total amount incorporated is small, it has almost no impact on the bonding strength of the adhesive film; since the foaming agent is dispersed inside the adhesive film, it is protected by the components inside the module itself, and the oxidation and ultraviolet degradation have little effect on it, and it can withstand the working life of about thirty years together with the adhesive film. During disassembly after retirement, only need to heat the module to about 200°C, the chemical function of the foaming agent is triggered, the adhesive film foams and expands, the bonding density is greatly reduced, thereby reducing the bonding strength and greatly reducing the disassembly difficulty. After disassembly, chemical solvent immersion can be carried out to remove the residual adhesive film on the surface of the glass and battery cells. Since the most difficult part of disassembling the glass and battery cells has been completed, a large amount of time can be saved and the amount of chemical solvent used can be reduced during the immersion stage. Therefore, using the adhesive film of the present invention for recycling operations can save heating energy consumption, reduce the amount of chemical solvent used, and improve the operation rate.

[0074] The prior art mainly has the following problems: 1. The bonding strength of ordinary photovoltaic adhesive films does not decrease significantly after the modules are retired, resulting in great peeling difficulty during the recycling stage, affecting the recycling efficiency and increasing the recycling cost in vain; 2. When using the thermal recycling method to treat the adhesive film of retired modules, it is necessary to soften or directly decompose it, and the disadvantage is excessive energy consumption; when using the chemical recycling method to treat the adhesive film, it requires long-term swelling or dissolution, with low treatment efficiency and large consumption of solvents.

[0075] Compared with the prior art, the present invention has the following beneficial effects: 1. By means of the foaming mechanism, the bonding strength of the adhesive film of retired modules can be controllably reduced, the peeling difficulty between the glass and battery cells of the module is reduced, the recycling efficiency is improved, and the recycling cost is reduced; 2. Overcome the disadvantages of excessive energy consumption of the thermal recycling method and long time and large solvent consumption of the chemical recycling method, save heating energy consumption, reduce the amount of chemical solvent used, and improve the operation rate.

[0076] To further understand the present invention, the preferred embodiments of the present invention will be described below in conjunction with examples. However, it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than a limitation on the claims of the present invention.

[0077] Example 1

[0078] 1. Raw materials for the adhesive film:

[0079] 5 kg of EVA 2825 resin particles;

[0080] Crosslinking agent TB, with a dosage of 0.2 wt% of the resin;

[0081] Crosslinking agent TA, with a dosage of 0.2 wt% of the resin;

[0082] Co-crosslinking agent TAIC, with a dosage of 0.2 wt% of the resin;

[0083] Coupling agent KH-570, with a dosage of 0.2 wt% of the resin;

[0084] Blowing agent ADC, with a dosage of 5.0 wt% of the resin.

[0085] 2. Preparation of the adhesive film:

[0086] (A) Blend the above raw materials at 60 rpm for 30 min to obtain a blended material.

[0087] (B) Feed the blended material into a casting machine for kneading (kneading temperature is 90 °C), and adjust the temperatures of each section of the single-screw extruder to 70 - 90 °C for preheating. After reaching the preheating temperature, set the temperatures of each section of the barrel to 75 - 95 °C, 75 - 95 °C, 78 - 98 °C, 78 - 98 °C, 78 - 98 °C, set the die head temperature to 75 - 95 °C, and the screw speed to 30 - 50 r / min. Then feed the kneaded material into the single-screw extruder unit for melting, and finally cast and extrude it into an adhesive film with a thickness of 500 μm.

[0088] 3. Product testing:

[0089] Assemble the photovoltaic module: Stack the above-prepared adhesive film, solar cells, and tempered glass in sequence according to the module pattern, and then laminate them through a vacuum laminator. The lamination temperature is 150 °C for 15 min, and the lamination pressure is about 0.02 MPa.

[0090] After the above photovoltaic module is retired, disassemble it. The disassembly process includes: After heating the retired photovoltaic module to 200 °C for 15 min, the chemical function of the blowing agent is triggered, the adhesive film foams and expands, forming a porous and loose structure, and the bonding density is greatly reduced. The peel strength at 200 °C is about 0.5 N / mm, and the front and rear glasses can be easily peeled off by hand directly, and the glasses themselves are intact without damage. The heating situation is as shown in Figure 1 shown, where the three samples from left to right correspond to the adhesive film of Example 2, the adhesive film of Example 1, and the adhesive film of Example 3 respectively. The modules before and after heating in this example are as shown in Figures 2-3 shown, whereFigure 2 The sample in Figure 3 is the component before heating, and the sample in

[0091] Example 2

[0092] 1. Film raw materials:

[0093] 5 kg of EVA 2825 resin particles;

[0094] Crosslinking agent TB, with a dosage of 0.5 wt% of the resin;

[0095] Crosslinking agent TA, with a dosage of 0.1 wt% of the resin;

[0096] Co-crosslinking agent TAIC, with a dosage of 0.5 wt% of the resin;

[0097] Coupling agent KH-570, with a dosage of 0.5 wt% of the resin;

[0098] Blowing agent H, with a dosage of 5.0 wt% of the resin.

[0099] 2. Film preparation: The same as in Example 1.

[0100] 3. Product testing:

[0101] Carried out according to the method in Example 1. The results show that in the disassembly process, after heating, the film foams and expands, and the film body is close to the viscous flow state. The glass and the battery sheet can be separated only by manual peeling, and the glass and the battery sheet are intact without damage. The components before heating in this example are respectively as Figure 4 shown.

[0102] Example 3

[0103] 1. Film raw materials:

[0104] 5 kg of EVA 2825 resin particles;

[0105] Crosslinking agent TB, with a dosage of 0.5 wt% of the resin;

[0106] Crosslinking agent TA, with a dosage of 0.1 wt% of the resin;

[0107] Co-crosslinking agent TAIC, with a dosage of 0.5 wt% of the resin;

[0108] Coupling agent KH-570, with a dosage of 0.5 wt% of the resin;

[0109] Blowing agent nitroguanidine, with a dosage of 5.0 wt% of the resin.

[0110] 2. Film preparation: The same as in Example 1.

[0111] 3. Product Testing:

[0112] It was carried out according to the method in Example 1. The results showed that in the disassembly process, after heating, the adhesive film foamed and expanded, and the adhesive film body was close to the viscous flow state. The glass and the battery cell could be separated only by manual peeling, and the glass and the battery cell were intact without damage.

[0113] Example 4

[0114] 1. Adhesive Film Raw Materials:

[0115] 5 kg of EVA 28150 resin particles;

[0116] Crosslinking agent TB, with a dosage of 1.0 wt% of the resin;

[0117] Crosslinking agent TA, with a dosage of 0.02 wt% of the resin;

[0118] Co-crosslinking agent TAIC, with a dosage of 1.0 wt% of the resin;

[0119] Coupling agent KH-570, with a dosage of 1.0 wt% of the resin;

[0120] Foaming agent RA, with a dosage of 5.0 wt% of the resin.

[0121] 2. Adhesive Film Preparation: The same as Example 1.

[0122] 3. Product Testing:

[0123] It was carried out according to the method in Example 1. The results showed that in the disassembly process, after heating, the adhesive film foamed and expanded, and the adhesive film body was close to the viscous flow state. The glass and the battery cell could be separated only by manual peeling, and there was a small amount of residue on the glass and the battery cell. After short-term chemical immersion, the surface residue was removed, and the glass and the battery cell were intact without damage.

[0124] Example 5

[0125] 1. Adhesive Film Raw Materials:

[0126] 5 kg of EVA 28150 resin particles;

[0127] Crosslinking agent TB, with a dosage of 1.0 wt% of the resin;

[0128] Crosslinking agent TA, with a dosage of 0.02 wt% of the resin;

[0129] Co-crosslinking agent TAIC, with a dosage of 1.0 wt% of the resin;

[0130] Coupling agent KH-570, with a dosage of 1.0 wt% of the resin;

[0131] Foaming agent THT, with a dosage of 5.0 wt% of the resin.

[0132] 2. Preparation of the adhesive film: The same as in Example 1.

[0133] 3. Product testing:

[0134] Carried out according to the method in Example 1. The results show that in the disassembly process, after heating, the adhesive film foams and expands, and the adhesive film body is close to the viscous flow state. The glass and the battery cells can be separated only by manual peeling, and there is a small amount of residue on the glass and the battery cells. After short-term chemical immersion, the surface residue is removed, and the glass and the battery cells are intact without damage.

[0135] Comparative Example 1

[0136] 1. Adhesive film raw materials:

[0137] Carried out according to Example 1, except that the foaming agent ADC is replaced by the foaming agent barium azodicarboxylate.

[0138] 2. Preparation of the adhesive film: The same as in Example 1.

[0139] 3. Product testing:

[0140] Carried out according to the method in Example 1. The results show that in the disassembly process, there is more sticky residue on the adhesive film and it is difficult to peel off.

[0141] In this article, specific examples are used to elaborate on the principles and implementation methods of the present invention. The descriptions of the above examples are only used to help understand the method and its core idea of the present invention, including the best mode, and also enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The protection scope of this invention patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the literal description of the claims, or if they include equivalent structural elements that have no substantial difference from the literal description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. An easily disassembled adhesive film, characterized in that, The raw materials for its preparation include: Resin; Crosslinking agent TB, with a dosage of 0.2 wt% - 1 wt% of the resin; Crosslinking agent TA, with a dosage of 0.02 wt% - 0.2 wt% of the resin; Co-crosslinking agent, with a dosage of 0.2 wt% - 1 wt% of the resin; Coupling agent, with a dosage of 0.2 wt% - 1 wt% of the resin; Blowing agent, with a dosage of 0.5 wt% - 8 wt% of the resin; Among them, The blowing agent is at least one of blowing agent ADC, blowing agent H, nitroguanidine, blowing agent RA, and blowing agent THT; The crosslinking agent TB is tert-butyl peroxy-2-ethylhexyl carbonate; The crosslinking agent TA is t-amyl peroxy-2-ethylhexyl carbonate.

2. The adhesive film according to claim 1, characterized in that, The resin is EVA resin and / or POE resin.

3. The adhesive film according to claim 1, wherein The co-crosslinking agent is TAIC.

4. The adhesive film according to claim 2, wherein The EVA resin is at least one of the models 2825 and 28150; The POE resin is at least one of the models 8660 and 8669.

5. The preparation method of the easily disassembled adhesive film according to any one of claims 1 to 4, characterized in that, Include: (A) Blend the resin, crosslinking agent TB, crosslinking agent TA, co-crosslinking agent, coupling agent, and blowing agent to obtain a blended material; (B) Knead, melt, and cast the blended material into a film to obtain an easily disassembled adhesive film.

6. The preparation method according to claim 5, characterized in that, In step (B), the melting is carried out in a single-screw extruder; The conditions of the single-screw extruder are set as follows: the temperatures of each section of the barrel are set at 75 - 95 °C, 75 - 95 °C, 78 - 98 °C, 78 - 98 °C, 78 - 98 °C, the temperature of the die head is set at 75 - 95 °C, and the screw speed is 30 - 50 r / min.

7. The preparation method according to claim 5, characterized in that The thickness of the adhesive film obtained in step (B) is 300 - 500 μm; The temperature of the kneading is 78 - 98 °C; In step (A), the rotation speed of the blending is 60 - 120 rpm, and the time is 20 - 40 min.

8. A photovoltaic module, characterized in that, The adhesive film therein is the easily disassembled adhesive film described in any one of claims 1 - 4 or is prepared by the preparation method described in any one of claims 5 - 7.

9. A disassembly method for retired photovoltaic modules, characterized in that Include: Heat the retired photovoltaic module and strip the module; Among them, the retired photovoltaic module is the retired part of the photovoltaic module described in claim 8.

10. The disassembly method according to claim 9, characterized in that, The temperature of the heating is 180 - 220 °C.

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