Packaging material and preparation method thereof, and photovoltaic module containing packaging material

Abstract

The invention provides a packaging material and a preparation method thereof, and a photovoltaic module containing the packaging material. The packaging material comprises a fluoroplastic film layer, a first powder coating layer, a fiber reinforcement layer, a second powder coating layer and a waterproof layer which are arranged in sequence. According to the packaging material, through specific structural design and material selection, the packaging material has excellent weather resistance, high hardness and low water vapor transmittance, and the photovoltaic module comprising the packaging material is good in weather resistance and long in service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic materials, and in particular relates to a packaging material and a preparation method thereof, and a photovoltaic component comprising the same. Background Art

[0002] With the continuous growth of global energy demand and the increasingly severe environmental problems, solar photovoltaic technology, as a clean and renewable energy solution, has received widespread attention and rapid development. Photovoltaic modules are the core components of solar photovoltaic systems, and their performance and reliability directly affect the power generation efficiency and service life of the entire system. Photovoltaic modules are usually composed of front panels (packaging materials), photovoltaic cells, adhesive films, back panels, etc., among which the selection of packaging materials has an important impact on the overall performance of the module.

[0003] The packaging material of traditional photovoltaic modules is mainly glass. This is because glass has excellent light transmittance and mechanical strength, and can protect photovoltaic cells from the influence of the external environment for a long time. However, glass as a packaging material also has some obvious defects; first, it is heavy and has a high density, which leads to a large weight of the entire photovoltaic module, which not only increases the difficulty and cost of transportation and installation, but also brings a greater burden to certain specific application scenarios (such as rooftop photovoltaic systems); second, although the glass material has a certain strength, it is easy to break when it is impacted or in extreme weather (such as hail, strong winds, etc.), thus affecting the service life and reliability of the photovoltaic module; third, high production energy consumption, the manufacturing process of glass requires high-temperature melting, high energy consumption, high production cost, and also brings a greater environmental burden.

[0004] Based on the above problems, researchers and enterprises have been exploring and developing new photovoltaic module encapsulation materials, hoping to reduce weight, improve production efficiency and reduce environmental impact while maintaining or improving module performance. Among them, lightweight, high-efficiency and environmentally friendly encapsulation materials have become a hot research direction. In recent years, some new materials and technologies have been introduced into the research of photovoltaic module front panels, such as the use of organic glass, polycarbonate or powder coating to prepare encapsulation materials in material selection; and the use of powdering technology in process preparation. Organic glass and other materials have lighter weight than traditional glass, but their weather resistance and mechanical strength are relatively low, and they are prone to aging and yellowing in long-term use. In addition, the existing encapsulation materials have high water vapor permeability and insufficient hardness, which affects the performance and life of the module. In addition, the powder coating is evenly sprinkled on the surface of the substrate by powdering technology, and then fixed by hot melt or ultraviolet light curing to obtain the encapsulation material. However, this method is inefficient in the production process, and the dust pollution is relatively serious, which has adverse effects on the environment and the health of operators.

[0005] Therefore, it is an urgent problem to be solved in this field to develop a packaging material with high hardness, low water vapor permeability, good weather resistance, high light transmittance, the ability to improve the weather resistance of component power, high production efficiency and environmental protection. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a packaging material and a preparation method and application thereof. The packaging material has excellent weather resistance, high hardness and low water vapor transmission rate, and the photovoltaic module including the packaging material has good weather resistance and long service life.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a packaging material, comprising a fluoroplastic film layer, a first powder coating layer, a fiber-reinforced layer, a second powder coating layer and a water-blocking layer arranged in sequence.

[0009] In the present invention, the packaging material not only improves the hardness of the packaging material through the design of a specific structure, but also effectively reduces the water vapor permeability, thereby effectively protecting the internal structure of the photovoltaic module and extending its service life; through the selection of specific materials, the weather resistance of the packaging material can be improved, so that the material can remain stable in various environments, thereby ensuring the high performance and long life of the photovoltaic module.

[0010] Preferably, the fluoroplastic film layer includes any one of polyvinylidene fluoride film (PVDF film), polyvinyl fluoride film (PVF film), fluorinated ethylene propylene copolymer film (FEP film), ethylene-tetrafluoroethylene copolymer film (ETFE film), tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer film (THV film) or polychlorotrifluoroethylene film (PCTFE film) or a combination of at least two thereof.

[0011] Preferably, the thickness of the fluoroplastic film layer is 20 to 200 μm, for example, it can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, etc.

[0012] In the present invention, a fluoroplastic film layer of a specific type and thickness is used to ensure that the packaging material has excellent weather resistance, light transmittance and mechanical strength, while also ensuring the lightness and good flexibility of the material, and enabling the packaging material to maintain long-term stability under various environmental conditions.

[0013] Preferably, the light transmittance of the fluoroplastic film layer is ≥93%, and the UV blocking rate of the fluoroplastic film layer is ≥95%.

[0014] Preferably, based on the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 10-29%, for example, it can be 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29% and the like.

[0015] In the present invention, taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the total mass of the first powder coating layer and the second powder coating layer is 71-90%, for example, it can be 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88, 89%, 90%, etc.

[0016] Preferably, the material of the fiber-reinforced layer includes any one of carbon fiber, glass fiber, aramid fiber or cyanamide fiber, or a combination of at least two of them.

[0017] Preferably, the fiber reinforcement layer has a gram weight of 100 to 500 g / m 2 , for example, it can be 100g / m 2 , 110g / m 2 , 120g / m 2 , 130g / m 2 , 140g / m 2 , 150g / m 2 , 160g / m 2 , 170g / m 2 , 180g / m 2 , 190g / m 2 , 200g / m 2 , 220g / m 2 , 240g / m 2 , 260g / m 2 , 280g / m 2 , 300g / m 2 , 320g / m 2 , 340g / m 2, 360g / m 2 , 380g / m 2 , 400g / m 2 , 420g / m 2 , 440g / m 2 , 460g / m 2 , 480g / m 2 , 500g / m 2 wait.

[0018] In the present invention, the fiber reinforced layer has high modulus and high strength, which is beneficial to improving the tensile strength and bending resistance of the packaging material; the gram weight of the fiber reinforced layer is within a specific range, which can ensure both the reinforcement effect and the lightweight performance requirements of the packaging material.

[0019] Preferably, the fiber reinforced layer has a thickness of 0.2-0.4 mm, for example, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.4 mm, etc.

[0020] Preferably, in terms of mass percentage, the materials of the first powder coating layer and the second powder coating layer each independently include 80-90% resin (for example, 80%, 80.2%, 80.4%, 80.6%, 80.8%, 81%, 81.2%, 81.5%, 81.8%, 82%, 82.2%, 82.5%, 82.8%, 83%, 83.2%, 83.5%, 83.8%, 84%, 84.2%, 84.5%, 84.8%, 85%, 85.2%, 85.5%, 85.8%, 86%, 86.2%, 86.5%, 86.8%). %, 87%, 87.2%, 87.5%, 87.8%, 88%, 88.2%, 88.5%, 88.8%, 89%, 89.2%, 89.5%, 89.8%, 90%, etc.) and 8-20% curing agent (for example, it can be 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, etc.).

[0021] Preferably, the resin includes any one of epoxy resin, polyester resin, acrylic resin, polyurethane resin, or polyvinylidene fluoride resin, or a combination of at least two thereof.

[0022] In the present invention, it is preferred that the resin includes epoxy resin and acrylic resin, and the mass ratio of the epoxy resin to the acrylic resin is 1:(1-2), wherein the specific value in (1-2) can be, for example, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

[0023] Preferably, the curing agent includes any one or a combination of at least two of isocyanate curing agents, anhydride curing agents, long-chain fatty acid curing agents, carboxyl-containing polyesters, hydrogenated epoxide curing agents, glycidyl acrylate curing agents or acrylic acid.

[0024] Preferably, the isocyanate curing agent includes a blocked isocyanate; the anhydride curing agent includes phthalic anhydride and / or trimellitic anhydride; the long-chain fatty acid curing agent includes any one of sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid or hexadecanedioic acid, or a combination of at least two thereof.

[0025] Preferably, the materials of the first powder coating layer and the second powder coating layer each independently include 0.01-2% of other additives, measured in percentage by mass, for example, 0.01%, 0.02%, 0.05%, 0.08%, 0.1%, 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, etc.

[0026] In the present invention, the other additives include but are not limited to antioxidants, lubricants, light stabilizers, ultraviolet absorbers, etc.

[0027] Preferably, the first powder coating layer and the second powder coating layer have a gram weight of 100 to 1000 g / m 2 , for example, it can be 100g / m 2 , 120g / m 2 , 140g / m 2 , 160g / m 2 , 180g / m 2 , 200g / m 2 , 220g / m 2 , 240g / m 2 , 260g / m 2 , 280g / m 2 , 300g / m 2 , 320g / m 2 , 340g / m 2 , 360g / m 2 , 380g / m 2 , 400g / m 2 , 420g / m2 , 440g / m 2 , 460g / m 2 , 480g / m 2 , 500g / m 2 , 520g / m 2 , 540g / m 2 , 560g / m 2 , 580g / m 2 , 600g / m 2 , 620g / m 2 , 640g / m 2 , 660g / m 2 , 680g / m 2 , 700g / m 2 , 720g / m 2 , 740g / m 2 , 760g / m 2 , 780g / m 2 , 800g / m 2 , 820g / m 2 , 840g / m 2 , 860g / m 2 , 880g / m 2 , 900g / m 2 , 920g / m 2 , 940g / m 2 , 960g / m 2 , 980g / m 2 , 1000g / m 2 wait.

[0028] Preferably, the average particle size of the powder coating in the first powder coating layer and the second powder coating layer is independently 10 to 50 μm, for example, it can be 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, 48 μm, 50 μm, etc.

[0029] In the present invention, the average particle size of the powder coating is within the above range, which not only ensures the uniformity and density of the coating, but also avoids the problem of surface roughness caused by excessively large particles.

[0030] In the present invention, the particle size of the powder coating can be tested by a particle size analyzer, and powder coatings with different particle sizes can be obtained by processing and grinding.

[0031] Preferably, the thickness of the water-blocking layer is 10 to 200 μm, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm, 200 μm, etc.

[0032] In the present invention, the thickness of the water-blocking layer is within the above range, which can effectively isolate the intrusion of external water vapor and protect the integrity and stability of the internal structure of the package; at the same time, it meets the performance requirements of lightweight.

[0033] Preferably, the water-blocking layer comprises a substrate and a water-blocking coating layer, and the substrate is in contact with the second powder coating layer.

[0034] Preferably, the material of the substrate includes one or more of polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH) or polyethylene terephthalate (PET).

[0035] Preferably, the material of the water-blocking layer includes at least one of magnesium oxide, zinc oxide, aluminum oxide or silicon dioxide.

[0036] In a second aspect, the present invention provides a method for preparing the packaging material according to the first aspect, the preparation method comprising the following steps:

[0037] The fluoroplastic film layer, the first powder coating layer, the fiber reinforcement layer, the second powder coating layer and the water-blocking layer are sequentially stacked and heat-treated to obtain the packaging material.

[0038] Preferably, the lamination method comprises: subjecting the powder coating to double-layer co-extrusion to obtain a first powder coating layer and a second powder coating layer; placing a fiber reinforced layer between the first powder coating layer and the second powder coating layer for bonding; then compounding a fluoroplastic film layer on the side of the first powder coating layer away from the fiber reinforced layer, and compounding a water-blocking layer on the side of the second powder coating layer away from the fiber reinforced layer, to obtain a fluoroplastic film layer, a first powder coating layer, a fiber reinforced layer, a second powder coating layer and a water-blocking layer which are stacked in sequence.

[0039] Preferably, the temperature of the double-layer co-extrusion is 80-120°C, for example, it can be 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, etc.; the extrusion speed is 3-5m / min, for example, it can be 3m / min, 3.5m / min, 4m / min, 4.5m / min, 5m / min, etc.

[0040] In the present invention, the double-layer co-extrusion is carried out in a twin-screw extruder; the screw diameter of the twin-screw extruder is 50 mm and the aspect ratio is 20:1; the temperature and extrusion speed of the double-layer co-extrusion are within the above range, so that the powder coating can be extruded uniformly and continuously to form a dense coating; during the extrusion process, the special structure of the twin-screw extruder enables the material to be fully mixed and plasticized in the barrel, thereby improving the uniformity and density of the coating. At the same time, precise extrusion temperature and speed control also avoids problems such as coating scorching or uneven stretching caused by excessive temperature or excessive speed.

[0041] In the present invention, a fiber reinforcement layer is precisely sandwiched between two layers of powder coating. This step requires extremely high operating precision and positioning accuracy. The specific steps include: first, cut the pre-prepared fiber cloth according to the predetermined size, and ensure that its surface is flat and wrinkle-free. Then, with the assistance of the extruder, the fiber cloth is accurately placed between the two layers of powder coating, and is tightly combined with the powder coating layer by appropriate pressure (0.1-1MPa) and temperature (80-120°C). The addition of the fiber reinforcement layer not only improves the overall strength and stiffness of the packaging material, but also improves its mechanical properties such as tensile strength and bending resistance. At the same time, the close combination between the fiber cloth and the powder coating layer also ensures the stability and reliability of the packaging material during subsequent processing and use.

[0042] Preferably, the temperature of the lamination, the composite fluoroplastic film layer, and the composite water-blocking layer are each independently 80-120°C, for example, 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, etc.; the time is each independently 0.5-5min, for example, 0.5min, 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, 5min, etc.; the pressure is each independently 0.1-1MPa, for example, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, etc.

[0043] In the present invention, in order to ensure that the fluoroplastic film can be evenly and firmly attached to the powder coating layer, during the thermal composite process, the heating element of the thermal composite machine quickly heats the film to a predetermined temperature and makes it in close contact with the powder coating layer through appropriate pressure. As the temperature rises and time passes, the intermolecular force between the fluoroplastic film and the powder coating layer gradually increases, forming a strong bonding interface. This step not only ensures the transparency and aesthetics of the fluoroplastic film, but also improves the overall performance and durability of the packaging material. After completing the thermal composite of the fluoroplastic film, the thermal composite technology is also used, and the thermal composite temperature and time are controlled within a specific range to ensure that the water-blocking film can be evenly and firmly attached to the powder coating layer. During the thermal composite process, special attention should be paid to the positioning and spreading of the water-blocking layer to ensure that it can completely cover the bottom of the powder coating layer and effectively isolate the intrusion of external water vapor. At the same time, it is also necessary to control the parameters such as the pressure and temperature of the thermal composite machine to avoid damage to the water-blocking film or affect its water-blocking performance.

[0044] In the present invention, the water-blocking layer can be prepared by processes such as atomic deposition, sputtering, and vacuum evaporation.

[0045] In the present invention, a specific process is adopted, namely double-layer co-extrusion to form a powder coating layer, which not only improves production efficiency, reduces production time and cost, but also optimizes the production process and reduces energy consumption; the fluoroplastic film layer and the water-blocking layer are combined with the powder coating layer by using thermal composite technology, which makes the preparation of the packaging material simpler and also improves the stability and reliability of the packaging material.

[0046] Preferably, the heat treatment temperature is 100-200°C, for example, it can be 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, etc.; the time is 1-5min, for example, it can be 1min, 2min, 3min, 4min, 5min, etc.; the pressure is 0.1-1MPa, for example, it can be 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, etc.

[0047] In the present invention, the heat treatment is performed by rollers; the temperature, pressure and time of the heat treatment are within the above ranges, so that the layers can be fully fused and form a good bonding interface.

[0048] In the present invention, during the heat treatment process, the roller heats and rolls the packaging material at a constant speed and temperature. As the temperature rises and time passes, the intermolecular forces inside the packaging material gradually increase and a cross-linking reaction occurs to form a stable network structure. This step not only improves the overall strength and rigidity of the packaging material, but also improves its comprehensive properties such as heat resistance, weather resistance and chemical resistance. Finally, the transparent packaging material after comprehensive heat treatment and curing treatment will present excellent appearance quality and excellent performance.

[0049] Preferably, the heat treatment further includes a cooling and / or winding step.

[0050] Preferably, the cooling temperature is 18-24°C, for example, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, etc.

[0051] In a third aspect, the present invention provides a photovoltaic component, wherein the photovoltaic component comprises the packaging material according to the first aspect.

[0052] In the present invention, the photovoltaic modules include TOPCon cell modules, heterojunction cell modules, perovskite laminated cell modules, etc.

[0053] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The packaging material provided by the present invention, through specific structural design and material selection, not only improves the hardness and weather resistance of the packaging material, but also effectively reduces the water vapor transmission rate, thereby effectively protecting the internal structure of the photovoltaic module and ensuring the high performance and long life of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic diagram of the structure of the packaging material provided in Example 1 of the present invention;

[0057] Among them, 1-fluoroplastic film layer; 2-first powder coating layer; 3-fiber reinforcement layer; 4-second powder coating layer; 5-water-blocking layer. DETAILED DESCRIPTION

[0058] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0059] Example 1

[0060] This embodiment provides a packaging material, and its structural schematic diagram is as follows Figure 1 As shown, it includes a fluoroplastic film layer 1, a first powder coating layer 2, a fiber reinforcement layer 3, a second powder coating layer 4 and a water-blocking layer 5 which are arranged in sequence.

[0061] The fluoroplastic film layer is an ETFE film (manufacturer: Nifurong, brand: 25RE) with a thickness of 25 μm.

[0062] Taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 15%, and the mass of the first powder coating layer and the second powder coating layer is 42.5%; the fiber reinforced layer is glass fiber cloth (manufacturer: Changzhou Compass, brand: EW100), and the gram weight of the fiber reinforced layer is 100g / m 2 , thickness is 300μm; the first powder coating layer and the second powder coating layer have the same thickness, both are made of acrylic resin powder coating, and both have a gram weight of 300g / m 2 In terms of mass percentage, the acrylic resin powder coating includes 85% acrylic resin (manufacturer: Japan Mitsubishi, brand: BR117), 10% phthalic anhydride and 5% additive (antioxidant 1010); the average particle size of the acrylic resin powder coating is 30 μm.

[0063] The water-blocking layer includes a substrate and a water-blocking coating, the substrate is in contact with the second powder coating layer, the substrate is made of PET, and the water-blocking coating is made of silicon dioxide; the thickness of the water-blocking layer is 100 μm, the thickness of the PET substrate is 40 μm, and the thickness of the silicon dioxide water-blocking coating is 60 μm.

[0064] This embodiment provides a method for preparing a packaging material, which specifically includes the following steps:

[0065] (1) According to the formula, acrylic resin, phthalic anhydride and an auxiliary agent are mixed, melt-extruded at 90° C., pressed and cooled, and then the obtained sheet material is coarsely crushed, ground and sieved to obtain an acrylic resin powder coating with an average particle size of 30 μm; then added to a twin-screw extruder with a screw diameter of 50 mm and an aspect ratio of 20:1 for double-layer co-extrusion, the heating temperature of the screw during the extrusion process is 100° C., and the extrusion speed is 5 m / min, to obtain a first powder coating layer and a second powder coating layer;

[0066] (2) cutting the glass fiber cloth into the same size as the first powder coating layer and the second powder coating layer, and accurately inserting the glass fiber cloth between the first powder coating layer and the second powder coating layer by means of an extruder, and closely attaching the glass fiber cloth to the first powder coating layer and the second powder coating layer for 1 minute at a temperature of 120° C. and a pressure of 0.1 MPa, thereby obtaining a first powder coating layer, a fiber reinforcement layer, and a second powder coating layer stacked in sequence;

[0067] (3) Compounding a fluoroplastic film layer on the side of the first powder coating layer away from the fiber reinforced layer, heating to a temperature of 120° C. using a thermal laminating machine, compounding for 1 minute, and compounding at a pressure of 0.1 MPa; then compounding a water-blocking layer on the side of the second powder coating layer away from the fiber reinforced layer using a thermal laminating machine, compounding at a temperature of 120° C., compounding for 1 minute, and compounding at a pressure of 0.1 MPa, to obtain a fluoroplastic film layer, a first powder coating layer, a fiber reinforced layer, a second powder coating layer, and a water-blocking layer stacked in sequence; the method for preparing the water-blocking layer comprises preparing a silicon dioxide water-blocking coating on a PET substrate surface by magnetron sputtering;

[0068] (4) The material obtained in step (3) is heated and rolled at a constant speed and temperature using a roller, the treatment temperature is 150° C., the treatment time is 3 min, the roller pressure is 0.1 MPa, and the roller speed is 10 m / min; then, the material is cooled using a cooling roller at a temperature of 24° C. to obtain the packaging material.

[0069] Example 2

[0070] This embodiment provides a packaging material, comprising a fluoroplastic film layer, a first powder coating layer, a fiber reinforcement layer, a second powder coating layer and a water-blocking layer which are arranged in sequence.

[0071] The fluoroplastic film layer is an ETFE film with a thickness of 50 μm.

[0072] Taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 10%, and the mass of the first powder coating layer and the second powder coating layer is 45%; the fiber reinforced layer is carbon fiber cloth (manufacturer: Hammer, brand: HM-20), and the gram weight of the fiber reinforced layer is 150g / m 2 , with a thickness of 350μm; the first powder coating layer and the second powder coating layer have the same thickness, and the materials are both acrylic resin powder coatings, and the gram weight is 350g / m 2 ; In terms of mass percentage, the acrylic resin powder coating includes 85% acrylic resin, 10% phthalic anhydride and 5% additive (antioxidant 1010); the average particle size of the acrylic resin powder coating is 50 μm.

[0073] The water-blocking layer includes a substrate and a water-blocking coating, the substrate is in contact with the second powder coating layer, the substrate is made of PET, and the water-blocking layer is made of silicon dioxide; the thickness of the water-blocking layer is 150 μm, the thickness of the PET substrate is 60 μm, and the thickness of the silicon dioxide water-blocking coating is 90 μm.

[0074] This embodiment provides a method for preparing a packaging material, which specifically includes the following steps:

[0075] (1) According to the formula, acrylic resin, phthalic anhydride and an auxiliary agent are mixed, melt-extruded at 90° C., pressed and cooled, and then the obtained sheet material is coarsely crushed, ground and sieved to obtain an acrylic resin powder coating with an average particle size of 50 μm; then added to a twin-screw extruder with a screw diameter of 50 mm and an aspect ratio of 20:1 for double-layer co-extrusion, the heating temperature of the screw during the extrusion process is 120° C., and the extrusion speed is 3 m / min, to obtain a first powder coating layer and a second powder coating layer;

[0076] (2) cutting the carbon fiber cloth into the same size as the first powder coating layer and the second powder coating layer, and accurately placing the carbon fiber cloth between the first powder coating layer and the second powder coating layer by means of an extruder, and closely fitting the carbon fiber cloth to the first powder coating layer and the second powder coating layer at a temperature of 100° C. and a pressure of 0.2 MPa to obtain a first powder coating layer, a fiber reinforcement layer, and a second powder coating layer stacked in sequence;

[0077] (3) A fluoroplastic film layer is laminated on the side of the first powder coating layer away from the fiber reinforced layer, and the temperature is heated to 100°C by a thermal laminating machine, the laminating time is 80 seconds, and the laminating pressure is 0.4 MPa; then, a water-blocking layer is laminated on the side of the second powder coating layer away from the fiber reinforced layer by a thermal laminating machine, the laminating temperature is 100°C, the laminating time is 80 seconds, and the laminating pressure is 0.4 MPa, to obtain a fluoroplastic film layer, a first powder coating layer, a fiber reinforced layer, a second powder coating layer and a water-blocking layer laminated in sequence; the preparation method of the water-blocking layer is the same as that in Example 1;

[0078] (4) The material obtained in step (3) is heated and rolled at a constant speed and temperature using a roller, the treatment temperature is 180° C., the treatment time is 1 min, the roller pressure is 0.5 MPa, and the roller speed is 10 m / min; then, the material is cooled using a cooling roller at a temperature of 24° C. to obtain the packaging material.

[0079] Example 3

[0080] This embodiment provides a packaging material, comprising a fluoroplastic film layer, a first powder coating layer, a fiber reinforcement layer, a second powder coating layer and a water-blocking layer which are arranged in sequence.

[0081] The fluoroplastic film layer is an ETFE film with a thickness of 100 μm.

[0082] Taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 18%, and the mass of the first powder coating layer and the second powder coating layer is 41%; the fiber reinforced layer is aramid fiber cloth (manufacturer: Changzhou Compass, brand: AP135), and the gram weight of the fiber reinforced layer is 200g / m 2 , with a thickness of 400μm; the first powder coating layer and the second powder coating layer have the same thickness, and the materials are both acrylic resin powder coatings, with a gram weight of 300g / ㎡; in terms of mass percentage, the acrylic resin powder coating includes 85% acrylic resin, 10% phthalic anhydride and 5% additives (antioxidant 1010); the average particle size of the acrylic resin powder coating is 20μm.

[0083] The water-blocking layer includes a substrate and a water-blocking coating, the substrate is in contact with the second powder coating layer, the substrate is made of PET, and the water-blocking coating is made of silicon dioxide; the thickness of the water-blocking layer is 50 μm, the thickness of the PET substrate is 20 μm, and the thickness of the silicon dioxide water-blocking coating is 30 μm.

[0084] This embodiment provides a method for preparing a packaging material, which specifically includes the following steps:

[0085] (1) According to the formula, acrylic resin, phthalic anhydride and an auxiliary agent are mixed, melt-extruded at 90° C., pressed and cooled, and then the obtained sheet material is coarsely crushed, ground and sieved to obtain an acrylic resin powder coating with an average particle size of 20 μm; then added to a twin-screw extruder with a screw diameter of 50 mm and an aspect ratio of 20:1 for double-layer co-extrusion, the heating temperature of the screw during the extrusion process is 80° C., and the extrusion speed is 4 m / min, to obtain a first powder coating layer and a second powder coating layer;

[0086] (2) cutting the aramid fiber cloth into the same size as the first powder coating layer and the second powder coating layer, and accurately inserting the aramid fiber cloth between the first powder coating layer and the second powder coating layer by means of an extruder, and making the aramid fiber cloth closely fit the first powder coating layer and the second powder coating layer under the conditions of a temperature of 90° C. and a pressure of 0.4 MPa, thereby obtaining a first powder coating layer, a fiber reinforcement layer, and a second powder coating layer stacked in sequence;

[0087] (3) A fluoroplastic film layer is laminated on the side of the first powder coating layer away from the fiber reinforced layer, and the layer is heated to 80°C by a thermal laminating machine, the laminating time is 40 seconds, and the laminating pressure is 0.6 MPa; then, a water-blocking layer is laminated on the side of the second powder coating layer away from the fiber reinforced layer by a thermal laminating machine, the laminating temperature is 80°C, the laminating time is 40 seconds, and the laminating pressure is 0.6 MPa, to obtain a fluoroplastic film layer, a first powder coating layer, a fiber reinforced layer, a second powder coating layer and a water-blocking layer laminated in sequence; the preparation method of the water-blocking layer is the same as that in Example 1;

[0088] (4) The material obtained in step (3) is heated and rolled at a constant speed and temperature using a roller, the treatment temperature is 120° C., the treatment time is 5 min, the roller pressure is 0.3 MPa, and the roller speed is 10 m / min; then, the material is cooled using a cooling roller at a temperature of 24° C. to obtain the packaging material.

[0089] Example 4

[0090] This embodiment provides a packaging material, which is different from the first embodiment only in that the ETFE film is replaced by a PVDF film of equal thickness, and other materials, structures and preparation methods are the same as those of the first embodiment.

[0091] Example 5

[0092] This embodiment provides a packaging material, which is different from the first embodiment only in that the ETFE film is replaced by a PVF film of equal thickness, and other materials, structures and preparation methods are the same as those of the first embodiment.

[0093] Example 6

[0094] This embodiment provides a packaging material, which is different from the embodiment 1 only in that the ETFE film is replaced by a PCTFE film of equal thickness, and other materials, structures and preparation methods are the same as those of the embodiment 1.

[0095] Example 7

[0096] This embodiment provides a packaging material, which is different from the first embodiment only in that the ETFE film is replaced by a FEP film of equal thickness, and other materials, structures and preparation methods are the same as those of the first embodiment.

[0097] Example 8

[0098] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both polyester resin powder coatings, that is, acrylic resin is replaced with polyester resin of equal quality (manufacturer: Dezhou Polyester Resin Chemical Co., Ltd., brand: LT-4ET), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0099] Example 9

[0100] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both polyurethane resin powder coatings, that is, the acrylic resin is replaced with a polyurethane resin of equal mass (manufacturer: Evonik, brand: B1530), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0101] Example 10

[0102] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both epoxy resin powder coatings, that is, the acrylic resin is replaced with an epoxy resin of equal mass (manufacturer: Shanghai Kaiyin Chemical, brand: E-51), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0103] Embodiment 11

[0104] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both a mixture of epoxy resin powder coating and acrylic resin powder coating, that is, the acrylic resin is replaced with equal masses of epoxy resin and acrylic resin (the mass ratio of epoxy resin to acrylic resin is 1:1.2), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0105] Example 12

[0106] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both a mixture of epoxy resin powder coating and acrylic resin powder coating, that is, the acrylic resin is replaced with equal masses of epoxy resin and acrylic resin (the mass ratio of epoxy resin to acrylic resin is 1:1.8), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0107] Embodiment 13

[0108] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both a mixture of epoxy resin powder coating and acrylic resin powder coating, that is, the acrylic resin is replaced with equal masses of epoxy resin and acrylic resin (the mass ratio of epoxy resin to acrylic resin is 1:0.6), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0109] Embodiment 14

[0110] This embodiment provides a packaging material, which differs from Embodiment 1 only in that the materials of the first powder coating layer and the second powder coating layer are both a mixture of epoxy resin powder coating and acrylic resin powder coating, that is, the acrylic resin is replaced with equal masses of epoxy resin and acrylic resin (the mass ratio of epoxy resin to acrylic resin is 1:2.2), and other materials, structures and preparation methods are the same as those in Embodiment 1.

[0111] Embodiment 15

[0112] This embodiment provides a packaging material, which is different from the embodiment 1 only in that the average particle size of the acrylic resin powder coating is 8 μm, and other materials, structures and preparation methods are the same as those of the embodiment 1.

[0113] Example 16

[0114] This embodiment provides a packaging material, which is different from the embodiment 1 only in that the average particle size of the acrylic resin powder coating is 60 μm, and other materials, structures and preparation methods are the same as those of the embodiment 1.

[0115] Embodiment 17

[0116] This embodiment provides a packaging material, which differs from Embodiment 1 only in that, taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 40%, and the mass of the first powder coating layer and the second powder coating layer is 60% each; other materials, structures and preparation methods are the same as those in Embodiment 1.

[0117] Embodiment 18

[0118] This embodiment provides a packaging material, which differs from Embodiment 1 only in that, taking the total mass of the first powder coating layer, the fiber reinforced layer and the second powder coating layer as 100%, the mass of the fiber reinforced layer is 6%, and the mass of the first powder coating layer and the second powder coating layer is 47% each; other materials, structures and preparation methods are the same as those in Embodiment 1.

[0119] Embodiment 19

[0120] This embodiment provides a packaging material, which differs from Embodiment 1 only in that, in the preparation method, the first powder coating layer and the second powder coating layer are not obtained by a double-layer co-extrusion method, but acrylic resin powder coating is applied on both sides of the glass fiber cloth, and then thermally bonded for 1 minute at a pressure of 0.1 MPa and a temperature of 120°C to obtain a first powder coating layer, a fiber reinforcement layer, and a second powder coating layer stacked in sequence. Other materials, structures and process parameters are the same as those in Embodiment 1.

[0121] Comparative Example 1

[0122] This comparative example provides a packaging material, which includes a fluoroplastic film layer, a water-blocking layer, a first powder coating layer, a fiber-reinforced layer, and a second powder coating layer arranged in sequence; the materials and thicknesses of each layer are the same as those in Example 1, and the only difference in the preparation method is that the position of the water-blocking layer is adjusted, and the other process parameters are the same as those in Example 1.

[0123] Comparative Example 2

[0124] The present comparative example provides a packaging material, which includes a fluoroplastic film layer, a polyethylene terephthalate film layer (with a thickness of 50 μm), a polyethylene film layer (with a thickness of 50 μm), a first powder coating layer, a fiber reinforced layer, and a second powder coating layer, which are arranged in sequence; the materials and thicknesses of the fluoroplastic film layer, the first powder coating layer, the fiber reinforced layer, and the second powder coating layer are the same as those in Example 1, and the only difference in the preparation method is that the position of each layer is adjusted, and the other process parameters are the same as those in Example 1.

[0125] The packaging materials provided in Examples 1 to 19 and Comparative Examples 1 and 2 were subjected to the following performance tests.

[0126] (1) Hardness: Tested using a pencil hardness tester.

[0127] (2) Transmittance: Use a spectrophotometer to test the transmittance of visible light of the packaging material.

[0128] (3) Water vapor transmission rate: The initial water vapor transmission rate of the packaging material is tested using a water vapor transmission rate tester. The specific testing method uses an infrared method. The testing temperature is 38°C and the humidity is 90%.

[0129] (4) Weather resistance: After placing the packaging material at a temperature of 85±2°C and a humidity of 85±2% for 1000 h (DH1000), the water vapor permeability is tested and the change in the water vapor permeability is calculated; the change in water vapor permeability = water vapor permeability after DH1000 - initial water vapor permeability; the smaller the absolute value of the change in water vapor permeability, the better the weather resistance.

[0130] The specific test results are shown in Table 1.

[0131] Table 1

[0132]

[0133] As can be seen from Table 1, the packaging material provided by the present invention adopts a specific structural design and material selection, and the obtained packaging material has a hardness of ≥4H, a light transmittance of ≥86.8%, and has low water vapor permeability and weather resistance.

[0134] It can be seen from the comparative examples that, without a specific structural design, the packaging material has low hardness, high water vapor permeability or poor weather resistance.

[0135] Application Example 1

[0136] This application example provides an N-type TOPCon (N-TOPCon) cell module, and the preparation method of the N-type TOPCon cell module includes:

[0137] (1) A layer of POE adhesive film dedicated to N-TOPCon batteries is laid on an aluminum backplane with a size of 1750 mm × 1033 mm × 0.3 mm, and then a square array of N-TOPCon battery strings welded in series and parallel is laid, and then a layer of POE adhesive film dedicated to N-TOPCon batteries is laid, and then a layer of packaging material is laid to obtain a laminated component; the packaging material includes the packaging materials provided in Examples 1 to 19 and Comparative Examples 1 and 2;

[0138] (2) placing the above-mentioned laminated assembly into a laminator for lamination, the lamination temperature is 145° C., vacuuming for 300 seconds, the segmented lamination pressures are -70 KPa, -50 KPa, and -30 KPa, respectively, and the lamination time is 600 seconds. After the lamination is completed, a laminated assembly is obtained;

[0139] (3) The above-mentioned laminated assembly is framed and fixed using a photovoltaic aluminum frame (with a size of 1756×1039×30 mm) to obtain the N-type TOPCon cell assembly.

[0140] Taking the N-TOPCon cell module including the packaging materials provided in Example 1 and Example 19 as an example, the initial power of the module and the power after DH1000 are shown in Table 2.

[0141] Application Example 2

[0142] This application example provides a heterojunction cell assembly, and the preparation method of the heterojunction cell assembly includes:

[0143] (1) laying a layer of POE film on an aluminum-containing backplane with a size of 1750 mm×1033 mm×0.3 mm, then laying a square array of heterojunction battery strings welded in series and parallel, laying another layer of POE film, and then laying a layer of packaging material to obtain a laminated component; the packaging material includes the packaging materials provided in Examples 1 to 19 and Comparative Examples 1 and 2;

[0144] (2) placing the above-mentioned laminated assembly into a laminator for lamination, the lamination temperature is 145° C., vacuuming for 300 seconds, the segmented lamination pressures are -70 KPa, -50 KPa, and -30 KPa, respectively, and the lamination time is 600 seconds. After the lamination is completed, a laminated assembly is obtained;

[0145] (3) The above-mentioned laminated assembly is framed and fixed using a photovoltaic aluminum frame (with a size of 1756×1039×30 mm) to obtain the heterojunction cell assembly.

[0146] Taking the heterojunction cell module including the packaging material provided in Example 4 as an example, the initial power of the module and the power after DH1000 are shown in Table 2.

[0147] Application Example 3

[0148] This application example provides a perovskite laminated cell assembly, and the preparation method of the perovskite laminated cell assembly includes:

[0149] (1) Laying a layer of POE film on an aluminum backplane with a size of 1750 mm × 1033 mm × 0.3 mm, then laying a square array of perovskite laminated battery strings welded in series and parallel, laying another layer of POE film, and then laying a layer of packaging material to obtain a laminated component; the packaging material includes the packaging materials provided in Examples 1 to 19 and Comparative Examples 1 and 2;

[0150] (2) placing the above-mentioned laminated assembly into a laminator for lamination, the lamination temperature is 145° C., vacuuming for 300 seconds, the segmented lamination pressures are -70 KPa, -50 KPa, and -30 KPa, respectively, and the lamination time is 600 seconds. After the lamination is completed, a laminated assembly is obtained;

[0151] (3) The above-mentioned laminated assembly is framed and fixed using a photovoltaic aluminum frame (with a size of 1756×1039×30 mm) to obtain the perovskite laminated cell assembly.

[0152] Taking the heterojunction cell module including the packaging material provided in Example 8 as an example, the initial power of the module and the power after DH1000 are shown in Table 2.

[0153] In the present invention, the power of the component is tested by IEC 60904-1-2016.

[0154] Table 2

[0155] Initial power (W) Power after DH1000 (W) Power reduction (W) Example 1 368 355 13 Example 4 376 361 15 Example 6 343 322 21 Embodiment 19 372 333 39 Comparative Example 1 359 326 33 Comparative Example 2 363 311 52

[0156] As shown in Table 2, the packaging material provided by the present invention can effectively improve the weather resistance of the photovoltaic module, so that the power attenuation of the photovoltaic module is small after DH1000; it shows that the packaging material of the present invention can effectively protect the photovoltaic cell, improve the durability and impact resistance of the photovoltaic module, extend the service life of the cell, and meet the high reliability requirements of photovoltaic modules in the fields of building integrated photovoltaic systems and outdoor advertising displays. In addition, the packaging material of the present invention has the characteristics of light weight, which can reduce the weight of the photovoltaic module, facilitate installation and transportation, and meet the needs of photovoltaic power generation equipment manufacturers for lightweight products.

[0157] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A packaging material, characterized in that: The packaging material comprises a fluoroplastic film layer, a first powder coating layer, a fiber reinforcement layer, a second powder coating layer and a water-blocking layer which are arranged in sequence.

2. The packaging material according to claim 1, characterized in that: The fluoroplastic film layer includes any one of polyvinylidene fluoride film, polyvinyl fluoride film, fluorinated ethylene propylene copolymer film, ethylene-tetrafluoroethylene copolymer film, tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer film or polychlorotrifluoroethylene film, or a combination of at least two thereof; Preferably, the thickness of the fluoroplastic film layer is 20-200 μm.

3. The packaging material according to claim 1 or 2, characterized in that: The mass of the fiber-reinforced layer is 10-29% based on the total mass of the first powder coating layer, the fiber-reinforced layer and the second powder coating layer as 100%; Preferably, the material of the fiber reinforcement layer includes any one of carbon fiber, glass fiber, aramid fiber or cyanamide fiber, or a combination of at least two thereof; Preferably, the fiber reinforcement layer has a gram weight of 100 to 500 g / m 2 ; Preferably, the fiber reinforced layer has a thickness of 0.2-0.4 mm.

4. The packaging material according to any one of claims 1 to 3, characterized in that: In terms of mass percentage, the materials of the first powder coating layer and the second powder coating layer each independently include 80-90% of resin and 8-20% of curing agent; Preferably, the resin includes any one of epoxy resin, polyester resin, acrylic resin, polyurethane resin, or polyvinylidene fluoride resin, or a combination of at least two thereof, more preferably a combination of epoxy resin and acrylic resin; Preferably, the resin comprises epoxy resin and acrylic resin, and the mass ratio of the epoxy resin to the acrylic resin is 1:(1-2); Preferably, the curing agent includes any one or a combination of at least two of isocyanate curing agents, anhydride curing agents, long-chain fatty acid curing agents, carboxyl-containing polyesters, hydrogenated epoxide curing agents, glycidyl acrylate curing agents or acrylic acid; Preferably, the isocyanate curing agent includes blocked isocyanate; the anhydride curing agent includes phthalic anhydride and / or trimellitic anhydride; the long-chain fatty acid curing agent includes any one of sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid or hexadecanedioic acid, or a combination of at least two thereof; Preferably, the materials of the first powder coating layer and the second powder coating layer each independently further include 0.01-2% of other additives in terms of mass percentage.

5. The packaging material according to any one of claims 1 to 4, characterized in that: The weight of the first powder coating layer and the second powder coating layer are independently 100 to 1000 g / m 2 ; Preferably, the average particle size of the powder coating in the first powder coating layer and the second powder coating layer is independently 10 to 50 μm.

6. The packaging material according to any one of claims 1 to 5, characterized in that: The thickness of the water-blocking layer is 10 to 200 μm; Preferably, the water-blocking layer comprises a substrate and a water-blocking coating, and the substrate is in contact with the second powder coating layer; Preferably, the material of the substrate includes one or more of polyvinyl alcohol, polyvinylidene chloride, ethylene-vinyl alcohol copolymer or polyethylene terephthalate; Preferably, the material of the water-blocking layer includes at least one of magnesium oxide, zinc oxide, aluminum oxide or silicon dioxide.

7. A method for preparing a packaging material according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: The fluoroplastic film layer, the first powder coating layer, the fiber reinforcement layer, the second powder coating layer and the water-blocking layer are sequentially stacked and heat-treated to obtain the packaging material.

8. The preparation method according to claim 7, characterized in that: The lamination method comprises: subjecting the powder coating to double-layer co-extrusion to obtain a first powder coating layer and a second powder coating layer; placing a fiber-reinforced layer between the first powder coating layer and the second powder coating layer for lamination; then laminating a fluoroplastic film layer on a side of the first powder coating layer away from the fiber-reinforced layer, and laminating a water-blocking layer on a side of the second powder coating layer away from the fiber-reinforced layer, to obtain a fluoroplastic film layer, a first powder coating layer, a fiber-reinforced layer, a second powder coating layer and a water-blocking layer laminated in sequence; Preferably, the temperature of the double-layer co-extrusion is 80-120°C, and the extrusion speed is 3-5 m / min; Preferably, the temperature of the lamination, the composite fluoroplastic film layer and the composite water-blocking layer are independently 80-120° C., the time is independently 0.5-5 min, and the pressure is independently 0.1-1 MPa.

9. The preparation method according to claim 7 or 8, characterized in that: The heat treatment temperature is 100-200°C, the time is 1-5 min, and the pressure is 0.1-1 MPa; Preferably, the heat treatment further includes cooling and / or winding steps; Preferably, the cooling temperature is 18-24°C.

10. A photovoltaic module, characterized in that: The photovoltaic module comprises the packaging material according to any one of claims 1 to 6.

Images