Modified POE photovoltaic packaging adhesive film, preparation method thereof and photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic packaging materials, and discloses a modified POE photovoltaic packaging adhesive film, a preparation method thereof and a photovoltaic module. The modified POE photovoltaic packaging adhesive film is prepared from 60 to 100 parts of POE resin, 8 to 50 parts of barrier master batch, 0.5 to 2 parts of composite silane coupling agent, 0.5 to 1.5 parts of cross-linking agent and 0.2 to 2 parts of assistant cross-linking agent, the barrier master batch comprises 5-30 parts of polar functionalized grafted POE and 3-20 parts of a barrier agent; the blocking agent is a cycloolefin copolymer COC with Tg less than or equal to 120 DEG C. The modified POE photovoltaic packaging adhesive film has the advantages of high light transmittance, PID resistance and the like of the existing POE adhesive film, and also has high bonding strength and low water vapor transmittance to photovoltaic glass; the problems of adhesion, water resistance and light transmittance of the POE adhesive film are solved synergistically, the inherent processing compatibility problem between COC and a POE substrate is solved, and a foundation is laid for improving the long-term reliability of a photovoltaic module.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic encapsulation materials technology, specifically to a modified POE photovoltaic encapsulation film with both ultra-high glass interface bonding strength and extremely low water vapor transmission rate, its preparation method, and a photovoltaic module. Background Technology

[0002] Polyolefin elastomers (POEs) have become the preferred encapsulation material for high-performance photovoltaic modules (especially double-glass modules and N-type cell modules) due to their excellent UV aging resistance, high volume resistivity, and resistance to potential-induced degradation (PID). However, traditional POE photovoltaic encapsulation films have two major technical shortcomings that limit their application in high-reliability scenarios: first, the initial adhesion strength to photovoltaic glass is relatively low, affecting the structural integrity and long-term mechanical load resistance of the laminated photovoltaic module; second, the water vapor transmission rate (WVTR) is relatively high, and water vapor penetration can corrode the cell grid lines, accelerate material aging, and lead to power degradation of the photovoltaic module, thereby reducing the power generation capacity of the photovoltaic module.

[0003] In existing technologies, silane coupling agents are typically added to improve the adhesion between the POE photovoltaic encapsulation film and the photovoltaic glass (as shown in publication number CN116404057A), or inorganic fillers (such as nano-aluminum hydroxide) are added to reduce the water vapor transmission rate of the POE photovoltaic encapsulation film. However, adding silane coupling agents has limited effect on improving adhesion performance and may also affect the storage stability of the POE photovoltaic encapsulation film. Adding inorganic fillers, on the other hand, severely impairs the light transmittance and crosslinking uniformity of the POE photovoltaic encapsulation film, thereby reducing the light absorption utilization rate of the photovoltaic module and affecting its power generation. Some studies have attempted to introduce high-barrier resins (such as polyethylene), but due to their poor compatibility with POE resin and mismatched processing temperatures, phase separation and appearance defects are easily caused.

[0004] Furthermore, cyclic olefin copolymers (COCs) possess extremely low water vapor transmission and excellent optical properties, making them ideal high-barrier materials. However, conventional cyclic olefin copolymers (COCs) have high glass transition temperatures (Tg) (typically >140℃), and their optimal processing temperature (200-220℃) is far higher than the 130℃ safe processing temperature limit of POE resin. Forcing blending at high temperatures can lead to thermal degradation of the POE resin and pre-curing of the crosslinking agent; conversely, blending at the POE resin's processing temperature prevents sufficient melting and dispersion of COC, resulting in performance defects. This processing window conflict presents technical challenges for the efficient application of COC in POE photovoltaic encapsulation films. Therefore, there is an urgent need to develop a new modified POE photovoltaic encapsulation film that can synergistically solve the problems of adhesion, water barrier, and light transmittance, and overcome the processing compatibility barriers between high-barrier materials like COC and the POE matrix. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module.

[0006] Based on this, the present invention discloses a modified POE photovoltaic encapsulating film, comprising the following raw materials in parts by weight: 60-100 parts of POE resin; 8-50 parts of barrier masterbatch; 0.5-2 parts of composite silane coupling agent; Crosslinking agent 0.5-1.5 parts; Crosslinking agent 0.2-2 parts; The barrier masterbatch comprises the following raw materials in parts by weight: 5-30 parts of polar functionalized POE grafted; 3-20 parts of barrier agent; The barrier agent is a cyclic olefin copolymer (COC) with a glass transition temperature ≤120℃.

[0007] Preferably, the polar functionalized grafted POE is at least one of maleic anhydride grafted POE and POE grafted glycidyl methacrylate, and the grafting rate of the polar functionalized grafted POE is 0.8-2.0%.

[0008] More preferably, the polar functionalized grafted POE is maleic anhydride grafted POE (grafting rate preferably 1.0-1.5%), and the weight of maleic anhydride grafted POE added to the barrier masterbatch is 15-25 parts.

[0009] Preferably, the glass transition temperature of the cyclic olefin copolymer (COC) is 65-100°C.

[0010] More preferably, the amount of cyclic olefin copolymer (COC) added to the barrier masterbatch is 10-15 parts by weight.

[0011] Preferably, the composite silane coupling agent is a mixture of γ-glycidoxypropyltrimethoxysilane (KH560) and γ-aminopropyltriethoxysilane (KH550) in a mass ratio of 1:0.8-1.5.

[0012] More preferably, the composite silane coupling agent is added to the modified POE photovoltaic encapsulating film in an amount of 1-1.5 parts by weight; the composite silane coupling agent is a mixture of γ-glycidoxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1.

[0013] Preferably, both the barrier masterbatch and the modified POE photovoltaic encapsulating film further include 0.025-0.25 parts by weight of an anti-aging agent.

[0014] More preferably, the anti-aging agent is a compound of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol ester (anti-aging agent 1076), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (anti-aging agent 1010) and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate ester (anti-aging agent 770) in a mass ratio of 1:1:(0.5~2).

[0015] Preferably, the crosslinking agent is one or more selected from 2-ethylhexyl carbonate tert-butyl peroxide, benzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, and 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane.

[0016] Preferably, the crosslinking agent is one or more of triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, and ethoxylated trimethylolpropane triacrylate.

[0017] This invention also discloses a method for preparing a modified POE photovoltaic encapsulating film, comprising the following preparation steps: S1. Preparation of barrier masterbatch: The barrier agent and polar functionalized grafted POE are melt-blended and extruded into granules at 180-250℃ to obtain the barrier masterbatch. S2. Casting: POE resin, barrier masterbatch, composite silane coupling agent, crosslinking agent and co-crosslinking agent are mixed evenly at 90-120℃, and then cast, extruded and cooled to obtain the modified POE photovoltaic encapsulation film.

[0018] The modified POE photovoltaic encapsulating film of this invention, through the introduction of low-Tg COC and its fine dispersion achieved through masterbatch processing, reduces the water vapor transmission rate of the modified POE photovoltaic encapsulating film to below 15 g / (m²·day), which is more than 40% lower than that of ordinary POE photovoltaic encapsulating films, ensuring its ultimate water resistance. Simultaneously, by introducing polar functionalized grafted POE into the barrier masterbatch and adding a composite silane coupling agent, the synergistic effect endows the modified POE photovoltaic encapsulating film with excellent adhesion properties, enabling the peel strength between the film and photovoltaic glass to exceed 100 N / cm, with extremely high peel strength retention after damp heat aging. Furthermore, this modified POE photovoltaic encapsulating film maintains high light transmittance and a good film appearance. Therefore, the modified POE photovoltaic encapsulating film of the present invention with ultra-high glass interface bonding strength and extremely low water vapor transmission rate can improve its aging resistance, mechanical strength, water resistance and anti-PID properties when applied to photovoltaic modules. It can reduce the power attenuation phenomenon caused by the failure of adhesive force in existing POE photovoltaic encapsulating films, help reduce the PID power attenuation phenomenon of photovoltaic modules, extend the service life of cells and improve their photoelectric conversion efficiency.

[0019] This invention also discloses a photovoltaic module, in which a modified POE photovoltaic encapsulating film described above is used as a photovoltaic encapsulating material. The photovoltaic module includes, from top to bottom, a photovoltaic front panel (such as photovoltaic glass), an upper encapsulating film, solar cells, a lower encapsulating film, and a photovoltaic backsheet; the upper encapsulating film and / or the lower encapsulating film are the modified POE photovoltaic encapsulating film described above.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects: This invention utilizes a low-Tg, high-barrier cyclic olefin copolymer (COC) with a Tg ≤ 120℃ as a highly efficient barrier phase in the barrier masterbatch, and introduces polar functionalized grafted POE, such as POE-g-MAH, as a key compatibilizer and interface enhancer. It also employs a composite silane coupling agent and adjusts the amounts of these raw materials. Thus, a multi-component synergistic modified POE photovoltaic encapsulation film system is successfully constructed. This modified POE photovoltaic encapsulation film maintains the high light transmittance and PID resistance advantages of existing POE photovoltaic encapsulation films while also possessing ultra-high adhesion strength and ultra-low water vapor transmission rate to photovoltaic glass. Therefore, this modified POE photovoltaic encapsulation film synergistically solves the adhesion, water barrier, and light transmittance problems of POE photovoltaic encapsulation films, and overcomes the inherent processing compatibility issues between high-barrier materials such as COC and the POE elastomer matrix, laying the foundation for improving the long-term reliability of photovoltaic modules. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0022] Example 1 This embodiment describes a method for preparing a modified POE photovoltaic encapsulating film, which includes the following preparation steps: S1: Preparation of barrier masterbatch: 10 parts (by weight, the same below) of high-barrier cyclic olefin copolymer (COC, Tg≈78℃; such as TOPAS 9506F-400 cyclic olefin copolymer from TOPAS Advanced Polymers, Germany) and 15 parts of maleic anhydride-functionalized grafted POE (POE-g-MAH; such as TAFMER™ from Mitsui Chemicals, Japan). MA8510 maleic anhydride grafted with POE, the maleic anhydride grafting rate was determined to be 1.2% by FTIR method. 0.15 parts of anti-aging agent (0.05 parts of anti-aging agent 1076 + 0.05 parts of anti-aging agent 1010 + 0.05 parts of anti-aging agent 770) were mixed and melt-blended and extruded and granulated at 180-250℃ (extrusion granulation was divided into five temperature zones, from zone one to zone five, the temperatures were 180℃-200℃-220℃-220℃-250℃ respectively) to obtain barrier masterbatch. S2: Casting: 75 parts of POE resin, the barrier masterbatch obtained in step S1, 1.5 parts of composite silane coupling agent (KH560:KH550 mixed in a mass ratio of 1:1), 0.8 parts of crosslinking agent (TBEC, tert-butyl peroxide-2-ethylhexyl carbonate), 0.5 parts of co-crosslinking agent (TAIC, triallyl isocyanurate), and 0.15 parts of anti-aging agent (0.05 parts of anti-aging agent 1076 + 0.05 parts of anti-aging agent 1010 + 0.05 parts of anti-aging agent 770) are mixed evenly at 100-120℃ (divided into five temperature zones, from zone one to zone five, with temperatures of 90℃-110℃-120℃-115℃-110℃ respectively). The mixture is then cast and extruded using a single-screw extruder, cooled, and wound up to obtain a modified POE photovoltaic encapsulation film as described in this embodiment.

[0023] A photovoltaic module according to this embodiment includes a photovoltaic front panel (photovoltaic glass), a first encapsulating film, a photovoltaic cell, a second encapsulating film, and a photovoltaic back panel stacked from top to bottom; the first encapsulating film and the second encapsulating film adopt a modified POE photovoltaic encapsulating film as described above in this embodiment.

[0024] Example 2 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In this embodiment, during step S1 of preparing the barrier masterbatch, the weight percentage of maleic anhydride functionalized grafted POE is changed to 5 parts; in step S2, the weight percentage of POE resin is changed to 85 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulant film remains unchanged. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulant film of this embodiment.

[0025] Example 3 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In this embodiment, during step S1 of preparing the barrier masterbatch, the weight percentage of maleic anhydride functionalized grafted POE is changed to 25 parts; in step S2, the weight percentage of POE resin is changed to 65 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulating film remains unchanged. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this embodiment.

[0026] Example 4 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In this embodiment, during step S1 of preparing the barrier masterbatch, the weight percentage of the high-barrier COC is changed to 3 parts; in step S2, the weight percentage of the POE resin is changed to 82 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulating film remains unchanged. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this embodiment.

[0027] Example 5 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In this embodiment, during step S1 of preparing the barrier masterbatch, the weight percentage of the high-barrier COC is changed to 15 parts; in step S2, the weight percentage of the POE resin is changed to 70 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulating film remains unchanged. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this embodiment.

[0028] Example 6 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In step S2 of this embodiment, during the casting process, the weight percentage of the composite silane coupling agent (KH560:KH550 mixed in a mass ratio of 1:1) is changed to 0.5 parts. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulation film of this embodiment.

[0029] Example 7 This embodiment describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Embodiment 1, the difference between this embodiment and Embodiment 1 is: In step S2 of this embodiment, during the casting process, the weight of the composite silane coupling agent (KH560:KH550 mixed in a mass ratio of 1:1) is changed to 2 parts. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulation film of this embodiment.

[0030] Comparative Example 1 This comparative example describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Example 1, the difference between this example and Example 1 is: In step S1 of this comparative example, the weight percentage of maleic anhydride-functionalized grafted POE is changed to 0 parts (i.e., no maleic anhydride-functionalized grafted POE is added). Correspondingly, in step S2, the weight percentage of POE resin is changed to 90 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulation film remains unchanged. All other steps are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulation film of this comparative example.

[0031] Comparative Example 2 This comparative example describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Example 1, the difference between this example and Example 1 is: In step S1 of this comparative example, the weight percentage of high-barrier COC is changed to 0 parts (i.e., no COC is added). Correspondingly, in step S2, the weight percentage of POE resin is changed to 85 parts to ensure that the total weight percentage of the modified POE photovoltaic encapsulating film remains unchanged. The rest are the same as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this comparative example.

[0032] Comparative Example 3 This comparative example describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Example 1, the difference between this example and Example 1 is: In step S2 of this comparative example, no composite silane coupling agent was added. All other steps were performed as in Example 1, thus obtaining a modified POE photovoltaic encapsulation film of this comparative example.

[0033] Comparative Example 4 This comparative example describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Example 1, the difference between this example and Example 1 is: In step S2 of this comparative example, 1.5 parts of the composite silane coupling agent (KH560:KH550 mixed in a mass ratio of 1:1) were replaced with the same amount of KH560. All other steps were performed as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this comparative example.

[0034] Comparative Example 5 This comparative example describes a modified POE photovoltaic encapsulating film, its preparation method, and a photovoltaic module. Referring to Example 1, the difference between this example and Example 1 is: In step S2 of this comparative example, 1.5 parts of the composite silane coupling agent (KH560:KH550 mixed in a mass ratio of 1:1) were replaced with the same amount of KH550. All other steps were performed as in Example 1, thus obtaining a modified POE photovoltaic encapsulating film of this comparative example.

[0035] Performance testing The modified POE photovoltaic encapsulating films prepared in Examples 1-7 and Comparative Examples 1-5 were tested for properties such as light transmittance, peel strength to photovoltaic glass, and water vapor transmission rate. The results of these performance tests are shown in Table 1 below.

[0036] Among them, the light transmittance was tested in accordance with the national standard GB / T 29848-2018, the water vapor transmittance was tested in accordance with the national standard GB / T26253-2010, and the peel strength was tested in accordance with the national standard GB / T 29848-2018.

[0037] Table 1

[0038] As can be seen from Table 1: (1) According to the test data of Examples 1, 2, 3 and Comparative Example 1 (the amounts of POE-g-MAH were 15 parts, 5 parts, 25 parts and 0 parts, respectively): As the amount of maleic anhydride-functionalized POE grafted into the barrier masterbatch increases, the peel strength and water vapor transmission rate (water-blocking performance) of the modified POE photovoltaic encapsulation film gradually increase. This is mainly because POE-g-MAH acts as a molecular bridge; its non-polar molecular chain matrix can achieve good compatibility with POE resin, while its polar functional groups can form strong chemical bonds with the photovoltaic glass surface and silane coupling agents, fundamentally improving interfacial adhesion. Therefore, based on the high compatibility of the entire system, the cohesive force of the molecular chains, and the improved density, the water vapor transmission rate of the modified POE photovoltaic encapsulation film is also significantly guaranteed. Of course, as shown in the test data of Examples 1-3 above, a certain balance needs to be struck between the amount of POE-g-MAH and the overall performance.

[0039] Furthermore, it should be noted that, as shown in Examples 1-3, the light transmittance of the film gradually decreases with the increase of POE-g-MAH dosage. Example 3 uses the highest amount of POE-g-MAH (25 parts), but Table 1 shows that the film in Example 3 has the lowest light transmittance (91%). Therefore, while increasing the amount of POE-g-MAH helps improve the peel strength and water-blocking properties of the film, it also leads to a decrease in the light transmittance. Thus, with further increases in the amount of POE-g-MAH, although the peel strength of the modified POE photovoltaic encapsulation film may improve to some extent, the light transmittance of the modified POE photovoltaic encapsulation film may further decrease.

[0040] Furthermore, with further increases in the amount of POE-g-MAH used, the film's appearance may become hazy (when the amount of POE-g-MAH increases, the film's appearance may change from transparent to hazy. The fundamental reason is the difference in refractive index, which causes the scattering mechanism to change from Rayleigh scattering to Mie scattering. Refractive index difference: The refractive index of POE-g-MAH (1.490-1.500) is slightly higher than that of ungrafted POE (≈1.480), with a refractive index difference of 0.01-0.02. This difference in refractive index mainly affects the scattering angle. When the amount of POE-g-MAH is low, Rayleigh scattering occurs, with minimal impact on transparency. When the amount of POE-g-MAH is high, Mie scattering occurs, resulting in uniform scattering of light and increased haze. That is, as the amount of POE-g-MAH further increases, its concentration in the POE matrix becomes higher, leading to a more significant difference in refractive index, which may easily result in a hazy appearance), making it difficult for its overall performance to meet the requirements.

[0041] Therefore, in this modified POE photovoltaic encapsulation film, the amount of maleic anhydride functionalized grafted POE should be controlled within the range of 5-30 parts (preferably 15-25 parts).

[0042] (2) Based on the test data of Examples 1, 4, 5 and Comparative Example 2 (the amounts of COC used were 10 parts, 3 parts, 15 parts, and 0 parts, respectively), it can be seen that: The introduction of the COC high-efficiency barrier phase in the barrier masterbatch significantly reduced the water vapor transmission rate of the modified POE photovoltaic encapsulation film. As the amount of COC in the barrier masterbatch increased, the water vapor transmission rate of the modified POE photovoltaic encapsulation film gradually decreased, but the film transmittance also decreased slightly (as shown in Examples 1 and 4-5). Furthermore, when the amount of COC in the barrier masterbatch increased to 15 parts (as shown in Example 5), the film began to show slight haziness. Although COC has good water resistance, excessive dosage can lead to adverse effects such as haziness and decreased transmittance in the modified POE photovoltaic encapsulation film. Therefore, the amount of COC should be controlled within the range of 3-20 parts (preferably 10-15 parts, more preferably 10 parts).

[0043] (3) Based on the test data of Examples 1, 6, 7 and Comparative Examples 3, 4, 5 (the amounts of composite silane coupling agent were 1.5 parts, 0.5 parts, 2 parts, 0 parts, 1.5 parts KH560, and 1.5 parts KH550, respectively), it can be seen that: With increasing dosage of the added composite silane coupling agent, the peel strength of the modified POE photovoltaic encapsulation film increases while the water vapor transmission rate decreases. However, when an equal amount of single KH550 or KH560 is used to replace the composite silane coupling agent, both the peel strength and water resistance of the modified POE photovoltaic encapsulation film decrease significantly. This indicates the synergistic enhancing effect of the composite silane coupling agent network on the adhesion and water resistance of the modified POE photovoltaic encapsulation film. Considering all factors, the dosage of the composite silane coupling agent should ideally be controlled within the range of 0.5-2 parts (preferably 1-1.5 parts).

[0044] In summary, this invention successfully constructs a multi-component synergistic modified POE photovoltaic encapsulation film system by selecting specific low-Tg high-barrier COCs from the barrier masterbatch, introducing polar functionalized grafted POE such as POE-g-MAH, using a composite silane coupling agent, and optimizing the dosage of these raw materials. The modified POE photovoltaic encapsulation film of this invention overcomes the inherent processing compatibility challenges between high-barrier materials and elastomer matrices, while simultaneously achieving ultra-high adhesion strength (preferably peel strength from photovoltaic glass >100 N / cm) and ultra-low water vapor transmission rate (preferably <15 g / (m²·day)) and good light transmittance.

[0045] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0046] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A modified POE photovoltaic encapsulating film, characterized in that, Including the following raw materials by weight: 60-100 parts of POE resin; 8-50 parts of barrier masterbatch; 0.5-2 parts of composite silane coupling agent; Crosslinking agent 0.5-1.5 parts; Crosslinking agent 0.2-2 parts; The barrier masterbatch comprises the following raw materials in parts by weight: 5-30 parts of polar functionalized POE grafted; 3-20 parts of barrier agent; The barrier agent is a cyclic olefin copolymer (COC) with a glass transition temperature ≤120℃.

2. The modified POE photovoltaic encapsulating film according to claim 1, characterized in that, The polar functionalized grafted POE is at least one of maleic anhydride grafted POE and POE grafted glycidyl methacrylate, and the grafting rate of the polar functionalized grafted POE is 0.8-2.0%.

3. The modified POE photovoltaic encapsulating film according to claim 2, characterized in that, The polar functionalized grafted POE is maleic anhydride grafted POE, and the weight of maleic anhydride grafted POE added to the barrier masterbatch is 15-25 parts.

4. The modified POE photovoltaic encapsulating film according to claim 1, characterized in that, The glass transition temperature of the cyclic olefin copolymer COC is 65-100℃.

5. The modified POE photovoltaic encapsulating film according to claim 4, characterized in that, The amount of cyclic olefin copolymer (COC) added to the barrier masterbatch is 10-15 parts by weight.

6. The modified POE photovoltaic encapsulating film according to claim 1, characterized in that, The composite silane coupling agent is a mixture of γ-glycidoxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:0.8-1.

5.

7. The modified POE photovoltaic encapsulating film according to claim 6, characterized in that, The composite silane coupling agent is added to the modified POE photovoltaic encapsulating film in a weight ratio of 1-1.5 parts; the composite silane coupling agent is a mixture of γ-glycidoxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:

1.

8. The modified POE photovoltaic encapsulating film according to claim 1, characterized in that, Both the barrier masterbatch and the modified POE photovoltaic encapsulating film also include 0.025-0.25 parts by weight of an anti-aging agent.

9. A method for preparing a modified POE photovoltaic encapsulating film according to any one of claims 1-8, characterized in that, The preparation steps include the following: S1. Preparation of barrier masterbatch: The barrier agent and polar functionalized grafted POE are melt-blended and extruded into granules at 180-250℃ to obtain the barrier masterbatch. S2. Casting: POE resin, barrier masterbatch, composite silane coupling agent, crosslinking agent and co-crosslinking agent are mixed evenly at 90-120℃, and then cast, extruded and cooled to obtain the modified POE photovoltaic encapsulation film.

10. A photovoltaic module, characterized in that, It includes a photovoltaic front panel, a first encapsulating film, a photovoltaic cell, a second encapsulating film, and a photovoltaic back panel stacked sequentially from top to bottom; the first encapsulating film and / or the second encapsulating film is a modified POE photovoltaic encapsulating film as described in any one of claims 1-8.

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