Fluorine-free weather-proof backboard for packaging photovoltaic module

Abstract

The utility model aims to disclose a fluoride-free weather-proof backboard for packaging a photovoltaic module, which relates to the technical field of photovoltaic cells and comprises a fluoride-free polyurethane weather-proof layer, a non-weather-proof polyester film layer and a fluoride-free adhesive layer which are sequentially arranged from top to bottom. The color of the fluoride-free polyurethane weather-proof layer is white or black; the fluoride-free weather-proof backboard has the beneficial effects that on one hand, each layer of the fluoride-free weather-proof backboard does not contain fluorine, the fluoride-free weather-proof backboard conforms to the domestic and international green and environment-friendly trend and actual requirements, the raw material cost and the recovery cost of the weather-proof backboard are reduced, and the damage to the environment is also reduced; on the other hand, titanium dioxide and polyurethane resin serve as main components of the fluoride-free polyurethane weather-resistant layer, the fluoride-free polyurethane weather-resistant layer and the non-weather-resistant polyester film layer form a weather-resistant layer together, the capacity of resisting environmental erosion is provided, titanium dioxide, tackifying resin and polyurethane resin serve as main components of the fluoride-free adhesive layer, and the weather resistance is kept while the viscidity is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a fluorine-free weather-resistant back sheet for photovoltaic component packaging. Background Art

[0002] At present, the outermost layer of the weather-resistant backsheet used for photovoltaic module encapsulation is mostly polyvinyl fluoride and polyvinylidene fluoride. These materials are not only expensive, but also contain fluorine, which causes certain damage to the environment. The encapsulated photovoltaic modules are not conducive to recycling and decomposition. The number of scrapped photovoltaic modules in the world is large, and the recycling income is large; the international green evaluation and management activities of photovoltaic modules are increasing; the international laws and regulations on photovoltaic modules are increasing; in the face of increasingly stringent safety and environmental protection requirements, the current weather-resistant backsheets of photovoltaic modules are still insufficient in terms of green environmental protection, which has affected their sustainable development to a certain extent.

[0003] In view of this, there is an urgent need to provide a fluorine-free weather-resistant backsheet for photovoltaic module packaging. Summary of the invention

[0004] The utility model aims to disclose a fluorine-free weather-resistant back sheet for photovoltaic module packaging.

[0005] In order to achieve the above-mentioned invention object, the utility model provides a fluorine-free weather-resistant back sheet for photovoltaic module encapsulation, which is composed of a fluorine-free polyurethane weather-resistant layer, a non-weather-resistant polyester film layer and a fluorine-free adhesive layer arranged in sequence from top to bottom;

[0006] The color of the fluorine-free polyurethane weather-resistant layer is white or black;

[0007] The thickness of the fluorine-free polyurethane weather-resistant layer is 10 μm-50 μm.

[0008] Preferably, the non-weather-resistant polyester film layer is a translucent film.

[0009] Preferably, the non-weather-resistant polyester film layer has a thickness of 150 μm-450 μm.

[0010] Preferably, the non-weather-resistant polyester film layer has a thickness of 250 μm-350 μm.

[0011] Preferably, the fluorine-free adhesive layer has a thickness of 2 μm-20 μm.

[0012] Preferably, the fluorine-free adhesive layer is white or black.

[0013] Preferably, the thickness of the fluorine-free polyurethane weather-resistant layer is 10 μm-20 μm.

[0014] Preferably, the fluorine-free adhesive layer has a thickness of 5 μm-10 μm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The fluorine-free weather-resistant backboard of the utility model is composed of a fluorine-free polyurethane weather-resistant layer, a non-weather-resistant polyester film layer and a fluorine-free adhesive layer which are arranged in sequence from top to bottom. On the one hand, they do not contain fluorine, which conforms to domestic and international green environmental protection trends and actual requirements, reduces the raw material cost and recycling cost of the weather-resistant backboard, and also reduces the damage to the environment; on the other hand, the fluorine-free polyurethane weather-resistant layer has fillers, pigments, UV-resistant additives and weather-resistant polyurethane resin as main components, and it forms a weather-resistant layer together with the non-weather-resistant polyester film layer, providing the ability to resist environmental erosion; the fluorine-free adhesive layer has titanium dioxide, pigments, tackifying resins and polyurethane resins as main components, and maintains weather resistance while providing viscosity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of the fluorine-free weather-resistant back sheet for photovoltaic module packaging according to the utility model.

[0018] Among them, 1. Fluorine-free polyurethane weather-resistant layer; 2. Non-weather-resistant polyester film layer; 3. Fluorine-free adhesive layer. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] Embodiment 1

[0022] See also Figure 1 As shown, the utility model provides a fluorine-free weather-resistant backboard for photovoltaic module encapsulation, which is composed of a fluorine-free polyurethane weather-resistant layer 1, a non-weather-resistant polyester film layer 2 and a fluorine-free adhesive layer 3 arranged in sequence from top to bottom; the fluorine-free polyurethane weather-resistant layer 1 is white or black; the thickness of the fluorine-free polyurethane weather-resistant layer 1 is 10μm-50μm.

[0023] Specifically, unlike the weather-resistant backplane in the prior art which uses polyvinyl fluoride film and polyvinylidene fluoride film, the fluorine-free weather-resistant backplane for photovoltaic module encapsulation in this embodiment does not contain fluorine, and is specifically composed of a fluorine-free polyurethane weather-resistant layer 1, a non-weather-resistant polyester film layer 2 and a fluorine-free adhesive layer 3; wherein the non-weather-resistant polyester film layer 2 is a translucent film, the thickness of the non-weather-resistant polyester film layer 2 is 150μm-450μm, the thickness of the non-weather-resistant polyester film layer is preferably 250μm-350μm, the non-weather-resistant polyester film layer 2 can be a PET film, or a high-strength PET film with a toughening agent added; the fluorine-free polyurethane weather-resistant layer 1 is scraped on the surface of the non-weather-resistant polyester film layer 2 by a wire rod, and the coating components of the fluorine-free polyurethane weather-resistant layer 1 are titanium dioxide, solvent, dispersant, matting powder, polyurethane resin, UV-resistant additive, curing agent, pigment, etc. The fluorine-free polyurethane weather-resistant layer 1 has the functions of weather resistance, corrosion resistance and UV resistance. The fluorine-free polyurethane weather-resistant layer 1 and the non-weather-resistant polyester film layer 2 together form a weather-resistant layer, which provides the ability to resist environmental erosion. The thickness of the fluorine-free polyurethane weather-resistant layer is 10μm-50μm, and the thickness of the fluorine-free polyurethane weather-resistant layer is preferably 10μm-20μm; the fluorine-free adhesive layer 3 is composed of titanium dioxide, solvent, dispersant, matting powder, polyurethane resin, tackifying resin, curing agent, pigment, etc. The fluorine-free adhesive layer 3 needs to have high surface energy and low chemical inertness, so as to achieve good adhesion with the packaging film. It also needs to have good weather resistance and coating adhesion. The thickness of the fluorine-free adhesive layer is 2μm-20μm, the color of the fluorine-free adhesive layer is white or black, and the thickness of the fluorine-free adhesive layer is preferably 5μm-10μm.

[0024] Referring to Table 1, the embodiments of Example 1 to Example 4 and Comparative Examples 1 to Comparative Examples 5 were tested, and the initial peeling force of the fluorine-free polyurethane weather-resistant layer / (N / cm), the yellowing value of the fluorine-free weather-resistant backsheet PCT48h (T / E), the elongation retention rate of the fluorine-free weather-resistant backsheet PCT48h (MD / TD) / %, the UV200KWh powdering condition (T surface), the adhesion of the fluorine-free polyurethane weather-resistant layer (T / E) of DH2000h were tested respectively. Among them, the UV200KWh powdering condition was tested with reference to the ISO-4628-6 standard, and the adhesion of the fluorine-free polyurethane weather-resistant layer (T / E) of DH2000h was tested with reference to the GB / T9286-1998 standard.

[0025] Table 1 Performance parameters of fluorine-free weather-resistant backsheet

[0026]

[0027] In Comparative Examples 1 to 5, there are also three layers, namely, a fluorine-containing weather-resistant coating, a non-weather-resistant polyester film layer and a fluorine-free adhesive layer, wherein the non-weather-resistant polyester film layer and the fluorine-free adhesive layer have the same composition as the corresponding layers of Examples 1 to 4, and the difference is that the coating components of the fluorine-containing weather-resistant coating are titanium dioxide, solvent, dispersant, matting powder, fluorine-containing resin, UV-resistant additive, curing agent, pigment, etc., and comparative tests show that the fluorine-containing weather-resistant coatings of Comparative Examples 1 to 5 have the defects of easy powdering and insufficient adhesion, while the fluorine-free polyurethane weather-resistant layers of Examples 1 to 4 have strong weather resistance, are not easy to powderize, and have strong adhesion; the yellowing values ​​of the fluorine-containing weather-resistant backsheets of Comparative Examples 1 to 5 are much greater than the yellowing values ​​of the fluorine-free weather-resistant backsheets of Examples 1 to 4, indicating that the fluorine-free weather-resistant backsheets of Examples 1 to 4 are not easy to age, not easy to yellow, and not easy to have problems such as brittle cracking and failure.

Claims

1. A fluorine-free weather-resistant back sheet for photovoltaic module encapsulation, characterized in that: It is composed of a fluorine-free polyurethane weather-resistant layer, a non-weather-resistant polyester film layer and a fluorine-free adhesive layer arranged in sequence from top to bottom; The color of the fluorine-free polyurethane weather-resistant layer is white or black; The thickness of the fluorine-free polyurethane weather-resistant layer is 10 μm-50 μm.

2. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 1, characterized in that: The non-weather-resistant polyester film layer is a semi-transparent film.

3. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 2, characterized in that: The thickness of the non-weather-resistant polyester film layer is 150 μm-450 μm.

4. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 3, characterized in that: The thickness of the non-weather-resistant polyester film layer is 250 μm-350 μm.

5. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 1, characterized in that: The thickness of the fluorine-free adhesive layer is 2 μm-20 μm.

6. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 5, characterized in that: The fluorine-free adhesive layer is white or black.

7. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 1, characterized in that: The thickness of the fluorine-free polyurethane weather-resistant layer is 10 μm-20 μm.

8. The fluorine-free weather-resistant back sheet for photovoltaic module encapsulation according to claim 5, characterized in that: The thickness of the fluorine-free adhesive layer is 5 μm-10 μm.

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