Ultraviolet-resistant ETFE film for photovoltaic module and preparation method of ultraviolet-resistant ETFE film

Abstract

The invention provides an ultraviolet-resistant ETFE film for a photovoltaic module and a preparation method thereof, and the ETFE film comprises the following components based on the total weight of 100 parts: an ethylene-tetrafluoroethylene copolymer used as a base material; 0.5 to 1.5 parts by weight of a stabilizing auxiliary agent; the weight part of the antioxidant is 0.5 to 1.5 parts; and 0.4 to 1.6 parts by weight of an anti-ultraviolet agent. The weather resistance, the ultraviolet aging resistance and the light transmittance of the ultraviolet-resistant ETFE film for the photovoltaic module are remarkably improved by selecting an ethylene-tetrafluoroethylene copolymer (ETFE) as a base material, and meanwhile, the weather resistance, the ultraviolet aging resistance and the light transmittance of the ultraviolet-resistant ETFE film for the photovoltaic module are remarkably improved by adding a series of efficient anti-aging and anti-ultraviolet agents such as 2, 2 '-methylenebis6-(2H-benzotriazole-2-yl)-4-(1, 1, 3, 3-tetramethylbutyl) phenol and C27H27N302. Therefore, the ultraviolet blocking rate of the film is obviously improved, and the service life of a photovoltaic module is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ETFE film preparation, in particular to an ultraviolet-blocking ETFE film for photovoltaic components and a preparation method thereof. Background Art

[0002] ETFE is a fluorinated ethylene copolymer with excellent weather resistance, antifouling and self-cleaning properties. However, ETFE film is prone to aging under ultraviolet rays, which limits its application in photovoltaic modules.

[0003] Therefore, developing an ETFE film with excellent UV resistance and a preparation method thereof is of great significance for improving the service life and performance of photovoltaic modules. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide an ultraviolet-blocking ETFE film for photovoltaic modules and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention is implemented by the following technical scheme: a UV-blocking ETFE film for photovoltaic modules, the ETFE film comprising the following components based on 100 parts by total weight:

[0006] Ethylene-tetrafluoroethylene copolymer, as a base material;

[0007] Stabilizing agent, 0.5-1.5 parts by weight;

[0008] Antioxidant, 0.5-1.5 parts by weight; and anti-ultraviolet agent, 0.4-1.6 parts by weight, wherein:

[0009] The anti-ultraviolet agent is selected from the following components:

[0010] 2,2'-Methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, C 27 H 27 N 3 0 2 , C 69 H 48 N 4 O 8 , 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, and at least one of UV-008.

[0011] As a second aspect of the present invention, a method for preparing an ultraviolet-blocking ETFE film for a photovoltaic module is provided, comprising the steps of:

[0012] a. Mixing: Mix ETFE pure material and additives according to the proportion;

[0013] b. Heating and melting: heating the mixture to a molten state;

[0014] c. Extrusion film forming: Extrusion film forming through an extruder, the temperature of the extruder is controlled at 260-400℃;

[0015] d. Cooling: Cool the film in cooling water, and the temperature of the cooling water is controlled at 0-50℃;

[0016] e. Pulling and winding: After pulling and winding, the UV-blocking ETFE film is obtained.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention selects ethylene-tetrafluoroethylene copolymer (ETFE) as a matrix material, thereby significantly improving the weather resistance, UV aging resistance and light transmittance of a UV-blocking ETFE film for a photovoltaic module. Meanwhile, by adding a series of high-efficiency anti-aging and anti-UV agents, such as 2,2'-methylenebis-6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol and C27H27N302, the UV blocking rate of the film is significantly improved, thereby effectively extending the service life of the photovoltaic module.

[0019] In addition, the present invention not only enhances the processing stability and thermal stability of the film, but also improves its processing performance by using a processing stabilizing agent and an antioxidant;

[0020] Finally, the temperature of the extruder and the temperature of the cooling water are precisely controlled through the proposed preparation process, thereby ensuring the high-quality production of the ETFE film. Ultimately, the ETFE film of the present invention not only has a low production cost, but also has a good market prospect, providing a high-performance, low-cost packaging material for photovoltaic modules, while maintaining excellent self-cleaning properties, ensuring the long-term cleanliness and high efficiency of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0022] Figure 1 The figure is a schematic flow chart of a method for preparing an ultraviolet-blocking ETFE film for a photovoltaic module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0024] The present invention is further described in detail below with reference to the accompanying drawings, but is not intended to limit the present invention.

[0025] As an understanding of the technical concept and implementation principle of the present invention, the present invention proposes a UV-blocking ETFE film for photovoltaic modules and a preparation method thereof, the main purpose of which is to solve the problem that the existing ETFE film is easily aged under ultraviolet rays, which limits its application in photovoltaic modules.

[0026] When implementing it, Figure 1 As shown, as the first aspect of the present invention, a UV-blocking ETFE film for photovoltaic modules is proposed.

[0027] The present invention is described in detail below by way of Examples 1 to 3, but the technical scope of the present invention is not limited to these Examples. In the present invention, parts refer to parts by weight unless otherwise specified.

[0028] It should be noted that in each embodiment of the present invention, the following brands of raw materials are specifically selected: ESO is used as a processing optimization additive, and (RC 2 H 2 OR'COO) 3 C 3 H 5 , processing stabilizing agent, improves processing stability, the antioxidant is a general antioxidant, and 1010 additive is used.

[0029] Examples 1 to 3 relate to an ultraviolet blocking ETFE film for photovoltaic modules, and the contents of the components of the film are shown in the following table:

[0030]

[0031] The preparation methods of Examples 1 to 3 are as follows: a. Mixing: Mixing ETFE pure material and additives according to a ratio; b. Heating and melting: Heating the mixture to a molten state; c. Extruding film: Extruding the film through an extruder, and the temperature of the extruder is controlled at 260-400° C.; d. Cooling: Cooling the film in cooling water, and the temperature of the cooling water is controlled at 0-50° C.; e. Drawing and winding: After drawing and winding, a UV-blocking ETFE film is obtained.

[0032] Performance test: The data comparison is shown in the following table:

[0033]

[0034] It can be understood that light transmittance: the light transmittance of the ETFE films of all embodiments is ≥90%, which is close to the light transmittance of pure ETFE of ≥93%, and better than the ≤90% of transparent PVDF. UV blocking rate: the ETFE films of Examples 1, 2, and 3 all show a UV blocking rate of ≥80%, which is significantly better than the ≤5% of pure ETFE. UV 300kwh yellow edge: the ETFE films of Examples 1, 2, and 3 have a yellow edge of ≤3 in the UV 300kwh test, showing good anti-ultraviolet aging performance. PCT48 additive precipitation: no additive precipitation was observed in all embodiments, indicating that the additive has good compatibility with the ETFE matrix material.

[0035] As a second aspect of the present invention, a method for preparing an ultraviolet-blocking ETFE film for a photovoltaic module is provided, comprising the following steps:

[0036] Mixing: Mix the ETFE pure material and additives in a high-speed mixer according to the proportion, and control the stirring speed at 100-300 rpm to ensure uniformity. Heating and melting: Heat the mixture to a molten state to prepare for extrusion. Extrusion film: Extrusion film is formed by an extruder at a temperature of 260-400°C, and the thickness of the film is controlled by adjusting the die gap of the extruder. Cooling: Cool the film in cooling water at 0-50°C to fix the structure of the film. Traction and winding: After traction and winding, a UV-blocking ETFE film is obtained, with a traction speed of 1-10 m / min and a winding tension of 1-5 kgf.

[0037] It should be noted that the above additives are calculated based on a total weight of 100 parts, and the weight proportions are as follows: stabilizing agent: 0.5-1.5 parts; antioxidant: 0.5-1.5 parts; anti-ultraviolet agent: 0.4-1.6 parts. The anti-ultraviolet agent is selected from the following components: 2,2'-methylenebis-6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, C 27 H 27 N 3 0 2 , C 69 H 48 N 4 O 8 , 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, UV-008; the stabilizing agent is (RC 2 H 2 OR'COO) 3 C 3 H 5 , the antioxidant is a general antioxidant.

[0038] So far, it can be concluded that, through the designed raw materials and proportions, the present invention significantly improves the anti-ultraviolet performance of the ETFE film while maintaining high light transmittance and good processing performance. Examples 1 to 3 demonstrate the effects of different combinations of anti-ultraviolet agents, proving the flexibility and wide applicability of the present invention. The above embodiments not only provide excellent material properties, but also take into account environmental protection and sustainability of raw materials, and have significant market application prospects.

[0039] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A UV-blocking ETFE film for photovoltaic modules, characterized in that: The ETFE film comprises the following components based on 100 parts by total weight: Ethylene-tetrafluoroethylene copolymer, as a base material; Stabilizing agent, 0.5-1.5 parts by weight; Antioxidant, 0.5-1.5 parts by weight; and anti-ultraviolet agent, 0.4-1.6 parts by weight, wherein: The anti-ultraviolet agent is selected from the following components: 2,2'-Methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, C 27 H 27 N302, C 69 H 48 At least one of N4O8, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, and UV-008.

2. The UV-blocking ETFE film for photovoltaic modules according to claim 1, characterized in that: The stabilizing agent is (RC2H2OR'COO)3C3H5, and the antioxidant is a general antioxidant.

3. A method for preparing an ultraviolet-blocking ETFE film for photovoltaic modules according to claim 1 or 2, characterized in that: Includes steps: a. Mixing: Mix ETFE pure material and additives according to the proportion; b. Heating and melting: heating the mixture to a molten state; c. Extrusion film forming: Extrusion film forming through an extruder, the temperature of the extruder is controlled at 260-400℃; d. Cooling: Cool the film in cooling water, and the temperature of the cooling water is controlled at 0-50℃; e. Pulling and winding: After pulling and winding, the UV-blocking ETFE film is obtained.

4. The method for preparing the UV-blocking ETFE film for photovoltaic modules according to claim 3, wherein: The additives are calculated based on 100 parts by total weight, and the weight proportions are as follows: Stabilizing agent: 0.5-1.5 parts; Antioxidant: 0.5-1.5 parts; Anti-ultraviolet agent: 0.4-1.6 parts.

5. The method for preparing the UV-blocking ETFE film for photovoltaic modules according to claim 4, characterized in that: The anti-ultraviolet agent is selected from the following components: 2,2'-methylenebis 6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, C 27 H 27 N302, C 69 H 48 At least one of N4O8, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, and UV-008; The stabilizing agent is (RC2H2OR'COO)3C3H5, and the antioxidant is a general antioxidant.

6. The method for preparing the UV-blocking ETFE film for photovoltaic modules according to claim 3, characterized in that: In the mixing step, the ETFE pure material and the additive are mixed in a high-speed mixer at a stirring speed of 100-300 rpm.

7. The method for preparing the UV-blocking ETFE film for photovoltaic modules according to claim 3, characterized in that: In the drawing and winding steps, the drawing speed is 1-10 m / min, and the winding tension is 1-5 kgf.

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