Structural adhesive film and photovoltaic module

Abstract

The utility model provides a structure bonding adhesive film and photovoltaic module, the structure bonding adhesive film comprises an adhesive film layer, an upper pressure sensitive adhesive layer, a lower pressure sensitive adhesive layer, upper release paper and lower release paper, the upper pressure sensitive adhesive layer is coated on the upper surface of the adhesive film layer, the lower pressure sensitive adhesive layer is coated on the lower surface of the adhesive film layer, and the lower release paper is coated on the lower surface of the adhesive film layer. The upper release paper is peelably adhered to the upper surface of the upper pressure-sensitive adhesive layer, and the lower release paper is peelably adhered to the lower surface of the lower pressure-sensitive adhesive layer. The release paper can be stripped from the pressure-sensitive adhesive layer, and pre-fixation with an external assembly body is realized through the pressure-sensitive adhesive layer, so that easy assembly is realized. The adhesive film layer can firmly fix the two external assembly bodies together in a laminated cross-linking mode, and long curing time is not needed. According to the structure bonding adhesive film capable of realizing pre-fixation, the assembly requirement of immediate curing can be met, meanwhile, the two procedures of gluing and curing during the assembly of the original photovoltaic module can be reduced, and the production efficiency of the photovoltaic module is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation, and particularly to a structural adhesive film and a photovoltaic module. Background Art

[0002] At present, with the development of technology, the utilization of energy has received increasing attention. The role of photovoltaic power generation technology in life has become more and more prominent. Photovoltaic power generation technology can convert light energy into electrical energy, making full use of the energy in nature.

[0003] For current photovoltaic modules, external structural components such as frames are mainly adhered to laminates through adhesives such as silicone. The advantage is that the structure is firm, but the disadvantages are also relatively obvious. For double-glass modules, there is also a disclosed combined frame in the industry, which can install the inner frame on the periphery of the laminate to be laminated and then laminate. The inner frame is fixed by the overflowing adhesive film. However, the inner frame may be displaced during movement and lamination, and there may also be problems of local insecure fixation. In addition, the curing of adhesives such as silicone requires time. Too long curing time affects the production rhythm. At the same time, for some special structures, relevant movements cannot be carried out before curing. If there is movement, additional tooling for restricting the displacement between the structural component and the laminate is required to prevent the displacement between the structural component and the laminate from causing the product to be scrapped due to non-compliance with standards. Utility Model Content

[0004] To solve one of the above technical problems, the present utility model provides a structural adhesive film and a photovoltaic module.

[0005] In a first aspect of an embodiment of the present utility model, a structural adhesive film is provided. The structural adhesive film includes a film layer, an upper pressure-sensitive adhesive layer, a lower pressure-sensitive adhesive layer, an upper release paper, and a lower release paper. The upper pressure-sensitive adhesive layer is coated on the upper surface of the film layer, the lower pressure-sensitive adhesive layer is coated on the lower surface of the film layer, the upper release paper is peelably adhered to the upper surface of the upper pressure-sensitive adhesive layer, and the lower release paper is peelably adhered to the lower surface of the lower pressure-sensitive adhesive layer.

[0006] Preferably, the film layer is a POE film layer, an EVA film layer, or a PVB film layer.

[0007] Preferably, the thickness of the film layer is 0.5 mm to 2 mm.

[0008] Preferably, the upper pressure-sensitive adhesive layer is uniformly coated on the upper surface of the film layer.

[0009] Preferably, the thickness of the upper pressure-sensitive adhesive layer is 10 μm to 50 μm.

[0010] Preferably, the lower pressure-sensitive adhesive layer is uniformly coated on the lower surface of the film layer.

[0011] Preferably, the thickness of the lower pressure-sensitive adhesive layer is 10 μm to 50 μm.

[0012] Preferably, one side of the upper release paper is a smooth surface and the other side is a rough surface, and the smooth surface of the upper release paper is adhered to the upper surface of the upper pressure-sensitive adhesive layer.

[0013] Preferably, one side of the lower release paper is a smooth surface and the other side is a rough surface, and the smooth surface of the lower release paper is adhered to the lower surface of the lower pressure-sensitive adhesive layer.

[0014] In a second aspect of the embodiments of the present invention, a photovoltaic module is provided, and the photovoltaic module includes the structural adhesive film according to the first aspect of the embodiments of the present invention.

[0015] The beneficial effects of the present invention are as follows: The structural adhesive film proposed by the present invention is composed of a film layer, a pressure-sensitive adhesive layer, and a release paper. The release paper can be peeled off from the pressure-sensitive adhesive layer, and the inner frame and the laminate are pre-fixed through the pressure-sensitive adhesive layer, realizing easy assembly, and the inner frame will not be displaced during movement or lamination. The film layer can firmly fix the two external assemblies together through lamination cross-linking, without a long curing time, solving the problem of insecure local fixation and ensuring good adhesion and sealing performance. The structural adhesive film with pre-fixation function proposed by the present invention can meet the assembly requirements of immediate curing, and at the same time can reduce the two processes of gluing and curing existing in the assembly of the original photovoltaic module, greatly improving the production efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the structural adhesive film according to Embodiment 1 of the present invention;

[0018] Figure 2 is a schematic structural diagram of the structural adhesive film according to Embodiment 2 of the present invention;

[0019] Figure 3 is a schematic bonding diagram of the structural adhesive film of the present invention and the assembly.

[0020] Reference numerals:

[0021] 1, film layer, 2, upper pressure-sensitive adhesive layer, 3, lower pressure-sensitive adhesive layer, 4, upper release paper, 5, lower release paper, 6, assembly A, 7, assembly B. DETAILED DESCRIPTION

[0022] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0023] Embodiment 1

[0024] As Figure 1 shown, this embodiment provides a structural adhesive film, which includes a film layer 1, an upper pressure-sensitive adhesive layer 2 and an upper release paper 4, and the film layer 1, the upper pressure-sensitive adhesive layer 2 and the upper release paper 4 are arranged in sequence from bottom to top.

[0025] Specifically, the structural adhesive film proposed in this embodiment has a three-layer structure, namely a film layer 1, an upper pressure-sensitive adhesive layer 2 and an upper release paper 4 arranged in sequence from bottom to top. Among them, the upper release paper 4 is adhesively connected to the upper pressure-sensitive adhesive layer 2 in a peelable manner, that is, the upper release paper 4 can be peeled off from the upper pressure-sensitive adhesive layer 2 under the action of an external force. In actual use, as Figure 3 shown, after simply peeling off the upper release paper 4, the film layer 1 and the upper pressure-sensitive adhesive layer 2 in the structural adhesive film are placed between the fitting A and the fitting B to form a preliminarily combined whole. Then, according to the process requirements, a certain temperature and pressure are applied by means of lamination. The film layer 1 directly bonds the assembly A6 and the assembly B7 together through crosslinking, and can be transferred to the next process without standing for curing.

[0026] The structural adhesive film proposed in this embodiment realizes the pre-fixation between the inner frame and the laminated part through the pressure-sensitive adhesive layer, realizes easy assembly, and the inner frame will not be displaced during movement or lamination. The film layer can firmly fix the two external assemblies together by means of lamination crosslinking, without a long curing time, solves the problem of insecure local fixation and ensures good adhesion and sealing performance. The structural adhesive film with pre-fixation function proposed by the present utility model can meet the assembly requirements of immediate curing, and at the same time can reduce the two processes of gluing and curing existing in the assembly of the original photovoltaic modules, greatly improving the production efficiency of the photovoltaic modules.

[0027] In some alternative embodiments, the film layer 1 can be a POE film layer, an EVA film layer or a PVB film layer. Specifically, it includes resin and additives. Among them, the resin can be selected from, but not limited to, one or more of copolymers such as POE resin, EVA resin, PVB resin and their related grafted resins. The additives can be matched according to actual needs, including but not limited to crosslinking agents, silane coupling agents, antioxidants, light stabilizers, processing aids, etc.

[0028] In some optional embodiments, the melt index corresponding to the adhesive film layer 1 is 20 g / 10 min to 60 g / 10 min to be applicable to a conventional lamination process. Specifically, the selectable melt indexes include 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, 55 g / 10 min or 60 g / 10 min, and no special limitation is made in this embodiment.

[0029] In some optional embodiments, the thickness of the adhesive film layer 1 is 0.5 mm to 2 mm. Specifically, the selectable thicknesses include 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, and no special limitation is made in this embodiment.

[0030] In some optional embodiments, the upper pressure-sensitive adhesive layer 2 can be selected from but not limited to one of the systems such as silica gel, acrylic acid, silicone, etc.

[0031] In some optional embodiments, the upper pressure-sensitive adhesive layer 2 is uniformly coated on the upper surface of the adhesive film layer 1 according to the required thickness. The thickness of the upper pressure-sensitive adhesive layer 2 is 10 μm to 50 μm. Specifically, the selectable thicknesses include 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, and no special limitation is made in this embodiment.

[0032] In some optional embodiments, one side of the upper release paper 4 is a smooth surface and the other side is a rough surface. After the upper pressure-sensitive adhesive layer 2 is uniformly coated on the surface of the adhesive film layer 1 and properly dried, the smooth surface of the upper release paper 4 is pasted on the surface of the upper pressure-sensitive adhesive layer 2, and it is ensured that the upper release paper 4 can completely cover the surface of the upper pressure-sensitive adhesive layer 2.

[0033] Example 2

[0034] As Figure 2 shown, this embodiment provides a structural adhesive film, which includes an adhesive film layer 1, an upper pressure-sensitive adhesive layer 2, a lower pressure-sensitive adhesive layer 3, an upper release paper 4 and a lower release paper 5, and the lower release paper 5, the lower pressure-sensitive adhesive layer 3, the adhesive film layer 1, the upper pressure-sensitive adhesive layer 2 and the upper release paper 4 are arranged in sequence from bottom to top.

[0035] Specifically, the structural adhesive film proposed in this embodiment has a five-layer structure. The upper pressure-sensitive adhesive layer 2 is coated on the upper surface of the adhesive film layer 1. The lower pressure-sensitive adhesive layer 3 is coated on the lower surface of the adhesive film layer 1. The upper release paper 4 is adhered to the upper surface of the upper pressure-sensitive adhesive layer 2. The lower release paper 5 is adhered to the lower surface of the lower pressure-sensitive adhesive layer 3. Among them, the upper release paper 4 and the upper pressure-sensitive adhesive layer 2 are detachably adhesively connected, that is, the upper release paper 4 can be peeled off from the upper pressure-sensitive adhesive layer 2 under the action of an external force. Similarly, the lower release paper 5 and the lower pressure-sensitive adhesive layer 3 are also detachably adhesively connected, that is, the lower release paper 5 can also be peeled off from the lower pressure-sensitive adhesive layer 3 under the action of an external force.

[0036] During actual use, as Figure 3 shown, after simply peeling off and removing the upper release paper 4 and the lower release paper 5 respectively, the lower pressure-sensitive adhesive layer 3, the adhesive film layer 1, and the upper pressure-sensitive adhesive layer 2 in the structural adhesive film are placed between the fitting A and the fitting B to form a preliminarily combined whole. Then, according to the process requirements, a certain temperature and pressure are applied by means of lamination. The adhesive film layer 1 directly bonds the assembly A6 and the assembly B7 together through crosslinking, and can be transferred to the next process without standing for curing.

[0037] The structural adhesive film proposed in this embodiment realizes pre-fixation between the inner frame and the laminated part through the pressure-sensitive adhesive layer, achieving easy assembly, and the inner frame will not be displaced during movement or lamination. The adhesive film layer can firmly fix the two external assemblies together through lamination crosslinking, without a long curing time, solving the problem of insecure local fixation and ensuring good adhesion and sealing performance. The structural adhesive film with pre-fixation function proposed by the present utility model can meet the assembly requirements of immediate curing, and at the same time can reduce the two processes of gluing and curing existing in the assembly of the original photovoltaic module, greatly improving the production efficiency of the photovoltaic module.

[0038] In some alternative embodiments, the adhesive film layer 1 can be a POE adhesive film layer, an EVA adhesive film layer, or a PVB adhesive film layer. Specifically, it includes resin and additives. Among them, the resin can be selected from, but not limited to, copolymers such as POE resin, EVA resin, PVB resin, and their related grafted resins, one or more of which. The additives can be matched according to actual needs, including but not limited to crosslinking agents, silane coupling agents, antioxidants, light stabilizers, processing aids, etc.

[0039] In some optional embodiments, the melt index corresponding to the adhesive film layer 1 is from 20 g / 10 min to 60 g / 10 min to be suitable for the conventional lamination process. Specifically, the selectable melt indices include 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, 55 g / 10 min or 60 g / 10 min, and no special limitation is made in this embodiment.

[0040] In some optional embodiments, the thickness of the adhesive film layer 1 is from 0.5 mm to 2 mm. Specifically, the selectable thicknesses include 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, and no special limitation is made in this embodiment.

[0041] In some optional embodiments, the upper pressure-sensitive adhesive layer 2 can be selected from but not limited to one of the systems such as silicone, acrylic, silicone, etc.

[0042] In some optional embodiments, the upper pressure-sensitive adhesive layer 2 is uniformly coated on the upper surface of the adhesive film layer 1 according to the required thickness. The thickness of the upper pressure-sensitive adhesive layer 2 is from 10 μm to 50 μm. Specifically, the selectable thicknesses include 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, and no special limitation is made in this embodiment.

[0043] In some optional embodiments, the lower pressure-sensitive adhesive layer 3 can be selected from but not limited to one of the systems such as silicone, acrylic, silicone, etc.

[0044] In some optional embodiments, the lower pressure-sensitive adhesive layer 3 is uniformly coated on the lower surface of the adhesive film layer 1 according to the required thickness. The thickness of the lower pressure-sensitive adhesive layer 3 is from 10 μm to 50 μm. Specifically, the selectable thicknesses include 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, and no special limitation is made in this embodiment.

[0045] In some optional embodiments, one side of the upper release paper 4 is a smooth surface and the other side is a rough surface. After the upper pressure-sensitive adhesive layer 2 is uniformly coated on the surface of the adhesive film layer 1 and properly dried, the smooth surface of the upper release paper 4 is pasted on the surface of the upper pressure-sensitive adhesive layer 2, and it is ensured that the upper release paper 4 can completely cover the surface of the upper pressure-sensitive adhesive layer 2.

[0046] In some optional embodiments, one side of the lower release paper 5 is a smooth surface and the other side is a rough surface. After the lower pressure-sensitive adhesive layer 3 is uniformly coated on the surface of the adhesive film layer 1 and properly dried, the smooth surface of the lower release paper 5 is pasted on the surface of the lower pressure-sensitive adhesive layer 3, and it is ensured that the lower release paper 5 can completely cover the surface of the lower pressure-sensitive adhesive layer 3.

[0047] Example 3

[0048] This embodiment provides a photovoltaic module, which includes a structural adhesive film. The specific structure of the structural adhesive film can refer to the content described in Embodiment 1 or Embodiment 2, and will not be elaborated in this embodiment.

[0049] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A structural adhesive film, characterized in that: The structural adhesive film includes an adhesive film layer, an upper pressure-sensitive adhesive layer, a lower pressure-sensitive adhesive layer, an upper release paper and a lower release paper. The upper pressure-sensitive adhesive layer is coated on the upper surface of the adhesive film layer, the lower pressure-sensitive adhesive layer is coated on the lower surface of the adhesive film layer, the upper release paper is releasably bonded to the upper surface of the upper pressure-sensitive adhesive layer, and the lower release paper is releasably bonded to the lower surface of the lower pressure-sensitive adhesive layer.

2. The structural adhesive film according to claim 1, characterized in that: The adhesive film layer is a POE adhesive film layer, an EVA adhesive film layer or a PVB adhesive film layer.

3. The structural adhesive film according to claim 1 or 2, characterized in that: The thickness of the adhesive film layer is 0.5 mm to 2 mm.

4. The structural adhesive film according to claim 1, characterized in that: The upper pressure-sensitive adhesive layer is evenly coated on the upper surface of the adhesive film layer.

5. The structural adhesive film according to claim 4, characterized in that: The thickness of the upper pressure-sensitive adhesive layer is 10 μm to 50 μm.

6. The structural adhesive film according to claim 1, characterized in that: The lower pressure-sensitive adhesive layer is evenly coated on the lower surface of the adhesive film layer.

7. The structural adhesive film according to claim 6, characterized in that: The thickness of the lower pressure-sensitive adhesive layer is 10 μm to 50 μm.

8. The structural adhesive film according to claim 1, characterized in that: One side of the upper release paper is a smooth side, and the other side is a rough side. The smooth side of the upper release paper is bonded to the upper surface of the upper pressure-sensitive adhesive layer.

9. The structural adhesive film according to claim 1, characterized in that: One side of the lower release paper is a smooth side, and the other side is a rough side. The smooth side of the lower release paper is bonded to the lower surface of the lower pressure-sensitive adhesive layer.

10. A photovoltaic module, characterized in that: The photovoltaic module comprises the structural adhesive film according to any one of claims 1 to 9.

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