A high-adhesion POE film and its preparation method and application

Abstract

The present invention discloses a high-bonding POE film and its preparation method and application, which belong to the technical field of solar photovoltaic films. The high-bonding POE film includes a POE resin, a POE silane grafted material, an initiator, a co-crosslinking agent, a UV stabilizer, an antioxidant and a silane coupling agent; the weight ratio of the POE resin and the POE silane grafted material is 100:1-10; the grafting rate of the POE silane grafted material is 2.5%-4.0%, and PDI≤1.8. The present invention optimizes the compounding of the POE silane grafted material and the POE resin so that the silane functional group forms a stable chemical bonding network in the film, which not only avoids migration and precipitation, but also can be directionally enriched at the interface to achieve long-term bonding, significantly improve the bonding strength of the film with the interfaces such as glass and backboard, and improve the resistance to wet heat aging. It is applied to the encapsulation of high-efficiency photovoltaic modules, which greatly improves the performance of photovoltaic modules.

Description

Technical Field

[0001] The present invention relates to the technical field of solar photovoltaic films, and in particular to a high-adhesion POE film and a preparation method and application thereof. Background Art

[0002] With the rapid development of the global photovoltaic industry, the performance requirements for photovoltaic module encapsulation materials are becoming increasingly stringent. As one of the core encapsulation materials, polyolefin elastomer (POE) film has gradually become the preferred encapsulation solution for high-efficiency photovoltaic technologies such as double-glass modules and N-type cells due to its excellent water vapor barrier properties, weather resistance, and low-temperature processing performance. However, the insufficient interfacial adhesion of traditional POE film in actual applications has long restricted its reliability improvement. Especially under complex environmental stresses such as humidity, heat, and ultraviolet radiation, the bond strength between the film and the glass front panel and polymer back panel is prone to attenuation, resulting in failure phenomena such as delamination of the module and displacement of the cell, which seriously threatens the life of the module. Studies have shown that approximately 40% of module encapsulation failure cases are directly related to interfacial debonding. Therefore, improving the interfacial adhesion of POE film has become a key technical research focus in the industry.

[0003] Currently, the industry generally uses physical blending of silane coupling agents or the addition of surface treatment layers to improve bonding performance. For example, Chinese Patent Publication No. CN102850947A proposes directly incorporating vinyl silane into a POE matrix, utilizing the silane's active groups to react with hydroxyl groups on the glass surface, which can improve initial bonding strength in the short term. However, this method has significant drawbacks: on the one hand, silane molecules have poor dispersion in the non-polar POE matrix and are prone to localized aggregation, resulting in an uneven distribution of interfacial reaction sites; on the other hand, unchemically bonded free silanes tend to migrate and precipitate to the surface in a hot and humid environment, accelerating interfacial hydrolysis and aging. Experimental data shows that after 1000 hours of hot and humid aging at 85°C / 85% RH, the peel strength retention rate of such films is typically less than 60%, making it difficult to meet the 25-year service life requirement for double-glass modules. Furthermore, Chinese Patent Publication No. CN117736656A proposes a multilayer structure design that improves interfacial bonding through a gradient distribution of coupling agents, but this involves a complex production process and high industrialization costs. Therefore, providing a high-adhesion POE film with a simple production process and good wet-heat aging performance is of great significance for photovoltaic module packaging. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention discloses a high-adhesion POE film and a preparation method thereof. The high-adhesion POE film of the present invention utilizes POE silane grafted material to maintain the inherent advantages of POE while significantly improving the peel strength after wet-heat aging, providing a breakthrough solution for high-reliability photovoltaic module packaging.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0006] In a first aspect, the present invention provides a high-adhesion POE film comprising a POE resin, a POE silane grafted material, an initiator, a co-crosslinking agent, a UV stabilizer, an antioxidant, and a silane coupling agent.

[0007] In some embodiments, the grafting rate of the POE silane grafted material is 2.5%-4.0%, and the PDI is ≤1.8; preferably, the grafting rate is 2.7%-3.5%, and the PDI is 1.2-1.5.

[0008] In some embodiments, the method for preparing the POE silane grafted material comprises the following steps:

[0009] (1) POE resin, double bond silane coupling agent and grafting initiator are mixed uniformly to obtain a premix;

[0010] (2) The premix undergoes grafting reaction under shearing action, and is cooled and pelletized to obtain POE silane grafted material.

[0011] Preferably, the weight ratio of the POE resin, double-bond silane coupling agent and grafting initiator in step (1) is 100:1-10:0.01-3.

[0012] Preferably, the melt index of the POE resin is 1-30 g / 10 min. More preferably, the POE resin is selected from one or more of metallocene-catalyzed ethylene copolymers of butene, hexene, and octene.

[0013] Preferably, the double bond silane coupling agent in step (1) is at least one of vinyltrimethoxysilane (VTMS), vinyltriethoxysilane (VTES), vinyltri(2-methoxyethoxy)silane, γ-(methacryloyloxy)propyltrimethoxysilane (KH570), and propenylmethyldimethoxysilane.

[0014] Preferably, the grafting initiator in step (1) is at least one of diisopropylbenzene peroxide (DCP), tert-butyl peroxy-2-ethylhexyl carbonate (TBEC), tert-amyl peroxy-2-ethylhexyl carbonate (TAEC), 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, and 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

[0015] Preferably, the shear force in step (2) is 1.38-1.42 OD / ID.

[0016] Preferably, the temperature of the grafting reaction in step (2) is 140-200°C.

[0017] In some embodiments, the weight ratio of the POE resin to the POE silane grafted material is 100:1-10.

[0018] In some embodiments, the high-bonding POE film includes the following raw materials in parts by weight: 100 parts of POE resin, 1-10 parts of POE silane grafted material, 0.5-1.5 parts of initiator, 0.4-2.2 parts of co-crosslinking agent, 0.01-0.5 parts of UV stabilizer, 0.01-0.5 parts of antioxidant and 0.01-0.5 parts of silane coupling agent.

[0019] In some embodiments, the melt index of the POE resin is 1-30 g / 10 min, and the POE resin is preferably selected from one or more of metallocene-catalyzed ethylene copolymers of butene, hexene, and octene.

[0020] The initiator is at least one of tert-butyl peroxy-2-ethylhexyl carbonate (TBEC), tert-amyl peroxy-2-ethylhexyl carbonate (TAEC), dicumyl peroxide (DCP), 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, and 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

[0021] The auxiliary cross-linking agent is at least one of triallyl isocyanurate (TAIC), triallyl cyanurate (TAC), trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), pentaerythritol triacrylate (PETA), ethoxylated trimethylolpropane triacrylate (EO-TMPTA), divinylbenzene (DVB), glycidyl methacrylate (GMA), and ethylene glycol dimethacrylate (EGDMA).

[0022] The UV stabilizer is at least one of 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol (Tinuvin 326), 2-(2H-benzotriazole-2-yl)-4,6-di-tert-butylphenol (Tinuvin 328), 2-hydroxy-4-n-octyloxybenzophenone (Chimassorb 81), 2-hydroxy-4-methoxybenzophenone (Cyasorb UV-531), 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol (Tinuvin 1577), and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (Tinuvin 770).

[0023] The antioxidant is at least one of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid octadecanoate (antioxidant 1076), 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), dilauryl thiodipropionate (antioxidant DLTP), tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (antioxidant 330), 4,4'-thiobis(6-tert-butyl-m-cresol) (antioxidant 300), tris(nonylphenyl) phosphite (TNPP), and 4-hydroxy-2,2,6,6-tetramethylpiperidinol (antioxidant 622).

[0024] The silane coupling agent is at least one of vinyltriethoxysilane (VTES), vinyltrimethoxysilane (VTMS), γ-(methacryloyloxy)propyltrimethoxysilane (KH570), vinyltri(β-methoxyethoxy)silane, vinyltriisopropylsilane, 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane.

[0025] In a second aspect, the present invention provides a method for preparing the above-mentioned high-adhesion POE film, comprising the following steps:

[0026] S1, mixing POE resin, POE silane grafted material, initiator, co-crosslinking agent, UV stabilizer and antioxidant according to the formula amount to obtain a mixture;

[0027] S2. The mixed material is kneaded and plasticized, and then cast, embossed, cooled, slit, and rolled to obtain the high-bonding POE film.

[0028] In a third aspect, the present invention provides the use of the above-mentioned high-adhesion POE film in photovoltaic module packaging.

[0029] In a fourth aspect, the present invention provides a photovoltaic module comprising the above-mentioned high-adhesion POE film.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. The present invention first selects a vinyl silane compound with high reaction activity as a grafting monomer. Its vinyl double bond can more efficiently undergo free radical grafting reaction with the POE molecular chain. Secondly, a dynamic vulcanization and peroxide initiation synergistic process is developed. During the mixing process, mechanical shearing is used to promote monomer diffusion. At the same time, the initiator dosage and reaction temperature (140-200°C) are precisely controlled to increase the grafting rate to 2.5%-4.0%, and the POE molecular weight distribution index (PDI) is maintained below 1.8, effectively inhibiting chain degradation.

[0032] 2. The present invention optimizes the compounding of POE silane grafting material and POE resin, so that the silane functional groups form a stable chemical bonding network in the film, which not only avoids migration and precipitation, but also can be directionally enriched at the interface, achieving long-term adhesion growth, significantly improving the bonding strength between the film and the glass, backboard, etc., and at the same time improving the resistance to moisture and heat aging.

[0033] 3. The high-adhesion POE film of the present invention still maintains good initial peel strength after 2000 hours of wet heat aging at 85°C / 85%RH, and is applied to the packaging of high-efficiency photovoltaic modules, greatly improving the performance of photovoltaic modules. DETAILED DESCRIPTION

[0034] The following examples are only intended to help understand the methods of the present invention and their core concepts. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The following description of the disclosed embodiments enables professionals in this field to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but may be applied to a wider range consistent with the principles and novel features disclosed herein. Although any methods and materials similar or equivalent to those described in the present invention may be used in the practice or testing of the present invention, preferred methods and materials are listed herein.

[0035] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0036] The grafting rate in the present invention is calculated as follows: GR (%) = (Wg - W0) / W0 × 100%; where Wg is the mass (g) of the graft copolymer after purification and drying; and W0 is the mass (g) of the original main chain polymer.

[0037] The calculation method of PDI is: PDI = Mw / Mn, where Mw is the weight average molecular weight and Mn is the number average molecular weight. The larger the PDI value, the wider the molecular weight distribution.

[0038] The raw materials used in the present invention are all conventional commercial products, so the present invention does not limit the source of the raw materials. For example, the POE resin is 8669 or 8660 from Dow, and the melt index value is 1-30 g / 10 min.

[0039] Example 1

[0040] High adhesion POE film A1:

[0041] The corresponding high-adhesion POE film was prepared according to the formula in Table 1 and the following preparation method.

[0042] Preparation method: POE resin, POE silane grafting material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent are measured and mixed evenly according to the formula, and the mixture is put into an extruder for mixing and plasticization. After the processes of casting, embossing, cooling, slitting, and winding, the high-bonding POE film A1 is obtained.

[0043] Table 1

[0044]

[0045] Wherein, the preparation method of the POE silane grafted material is:

[0046] 100 parts of POE resin, 4 parts of vinyltrimethoxysilane (VTMS), and 0.2 parts of dicumyl peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was fed into a twin-screw extruder (shear force of 1.40 OD / ID) for grafting reaction in a molten state (temperature usually controlled at 170°C). The shearing effect of the screw at a certain speed promoted the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 3%, PDI of 1.4).

[0047] Example 2

[0048] High adhesion POE film A2:

[0049] The corresponding high-adhesion POE film was prepared according to the formula in Table 2 and the following preparation method.

[0050] Preparation method: POE resin, POE silane grafting material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent are measured and mixed evenly according to the formula, and the mixture is put into an extruder for mixing and plasticization. After the processes of casting, embossing, cooling, slitting, and winding, the high-bonding POE film A2 is obtained.

[0051] Table 2

[0052]

[0053] Wherein, the preparation method of the POE silane grafted material is:

[0054] 100 parts of POE resin, 10 parts of γ-(methacryloyloxy)propyltrimethoxysilane (KH570), and 0.01 parts of dicumyl peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was fed into a twin-screw extruder (shear force of 1.38 OD / ID) for grafting reaction in a molten state (temperature usually controlled at 180°C). The shearing effect of the screw at a certain speed promotes the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 2.7%, PDI of 1.5).

[0055] Example 3

[0056] High adhesion POE film A3:

[0057] The corresponding high-adhesion POE film was prepared according to the formula in Table 3 and the following preparation method.

[0058] Preparation method: POE resin, POE silane grafting material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent are measured and mixed evenly according to the formula, and the mixture is put into an extruder for mixing and plasticization. After the processes of casting, embossing, cooling, slitting, and winding, the high-bonding POE film A3 is obtained.

[0059] Table 3

[0060]

[0061] Wherein, the preparation method of the POE silane grafted material is:

[0062] 100 parts of POE resin, 1 part of γ-(methacryloyloxy)propyltrimethoxysilane (KH570), and 3 parts of dicumyl peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was fed into a twin-screw extruder (shear force of 1.39 OD / ID) and subjected to a grafting reaction in a molten state (temperature usually controlled at 160°C). The shearing effect of the screw at a certain speed promoted the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 3.5%, PDI of 1.2).

[0063] Comparative Example 1

[0064] High adhesion POE film B1:

[0065] The difference between this comparative example and Example 1 is that the weight ratio of the POE resin to the POE silane grafted material is different, as shown in Table 4.

[0066] Table 4

[0067]

[0068] The rest is the same as shown in Example 1.

[0069] Comparative Example 2

[0070] High adhesion POE film B2:

[0071] The difference between this comparative example and Example 1 is that the weight ratio of the POE resin to the POE silane grafted material is different, as shown in Table 5.

[0072] Table 5

[0073]

[0074] The rest is the same as shown in Example 1.

[0075] Comparative Example 3

[0076] High adhesion POE film B3:

[0077] The difference between this comparative example and Example 1 is that the POE silane grafted material is replaced with the corresponding POE resin, as shown in Table 6.

[0078] Table 6

[0079]

[0080] The rest is the same as shown in Example 1.

[0081] Comparative Example 4

[0082] High adhesion POE film B4:

[0083] The difference between this comparative example and Example 1 is that the grafting rates of the POE silane grafted materials are different.

[0084] Specifically, the preparation method of the POE silane grafted material is:

[0085] 100 parts of POE resin, 12 parts of vinyltrimethoxysilane (VTMS), and 3 parts of dicumyl peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was then fed into a twin-screw extruder (shear force of 1.43 OD / ID) for grafting reaction in a molten state (temperature usually controlled at 180°C). The shearing effect of the screw at a certain speed promoted the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 4.1%, PDI of 1.3).

[0086] Example 4

[0087] High adhesion POE film A4:

[0088] The corresponding high-adhesion POE film was prepared according to the formula in Table 7 and the following preparation method.

[0089] Preparation method: POE resin, POE silane grafting material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent are measured and mixed evenly according to the formula, and the mixture is put into an extruder for mixing and plasticization. After the processes of casting, embossing, cooling, slitting, and winding, the high-bonding POE film A4 is obtained.

[0090] Table 7

[0091]

[0092] Wherein, the preparation method of the POE silane grafted material is:

[0093] 100 parts of POE resin, 4 parts of vinyltrimethoxysilane (VTMS), and 0.2 parts of dicumyl peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was fed into a twin-screw extruder (shear force of 1.42 OD / ID) for grafting reaction in a molten state (temperature usually controlled at 80°C). The shearing effect of the screw at a certain speed promoted the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 2.5%, PDI of 0.9).

[0094] Example 5

[0095] High adhesion POE film A5:

[0096] The corresponding high-adhesion POE film was prepared according to the formula in Table 8 and the following preparation method.

[0097] Preparation method: POE resin, POE silane grafting material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent are measured and mixed evenly according to the formula, and the mixture is put into an extruder for mixing and plasticization. After the processes of casting, embossing, cooling, slitting, and winding, the high-bonding POE film A5 is obtained.

[0098] Table 8

[0099]

[0100] Wherein, the preparation method of the POE silane grafted material is:

[0101] 100 parts of POE resin, 4 parts of vinyltrimethoxysilane (VTMS), and 0.2 parts of diisopropylbenzene peroxide (DCP) were weighed by weight and uniformly dispersed in a high-speed mixer to obtain a mixture. The mixture was fed into a twin-screw extruder (shear force of 1.38 OD / ID) and subjected to a grafting reaction in a molten state (temperature is usually controlled at 175°C). The shearing effect of the screw at a certain speed promotes the free radical grafting reaction between silane and POE molecular chain. The extruded melt was water-cooled and pelletized to form a POE silane grafted material (grafting rate of 4%, PDI of 1.8).

[0102] The performance of the above high-adhesion POE films A1-A5 and B1-B4 was tested and evaluated.

[0103] Sample preparation: Take two pieces of high-bond POE film with a size of 150mm×150mm, put them into a vacuum laminator in the order of glass / encapsulation film / encapsulation film / 150mm×300mm white CPC backboard, and laminate them at 150℃ (vacuum for 5 minutes, lamination for 10 minutes) to produce the component.

[0104] The above components were subjected to PCT aging (121°C, 100% RH, 48 hours) and DH aging (85°C, 85% RH, 2000 hours). The peel strength of the samples against glass was measured according to ASTM D903. A minimum of three samples were tested for each sample, and the average value was calculated. The ratio of the peel strength after aging to the peel strength before aging was recorded for each sample. The results are shown in Tables 9 and 10.

[0105] Table 9

[0106]

[0107] Table 10

[0108]

[0109] The results showed that the peel strengths of the high-bonding POE films A1-A5 prepared in Examples 1-5 against glass were 154.8-164.9 N / cm before aging. After aging in PCT48H (121°C / 100% RH) and DH2000H (85°C / 85% RH), the peel strength retentions were 82.7%-92.7% and 78.8%-87.7%, respectively. The peel strengths of the high-bonding POE films B1-B4 prepared in Comparative Examples 1-4 against glass were 134.4-147.9 N / cm before aging. After aging in PCT48H (121°C / 100% RH) and DH2000H (85°C / 85% RH), the peel strength retentions were 42.7%-67.5% and 34.7%-54.7%, respectively.

[0110] By comparing Example 1 with Comparative Examples 1 to Comparative Examples 3, it can be seen that when the weight ratio of POE resin and POE silane grafted material is not within the scope claimed for protection of the present invention, the peel strength of the high-bonding POE films B1-B3 prepared therefrom with glass before aging is 134.4-147.9 N / cm, which is much lower than A1 (162.3 N / cm). At the same time, after aging with PCT48H (121°C / 100% RH) and DH2000H (85°C / 85% RH), the peel strength retention rates are 42.7%-67.5% and 34.7%-54.7%, which are also much lower than A1 (92.7%, 79%). This indicates that the combination of POE resin and POE silane grafted material in a specific weight ratio can enhance the bonding durability between the material and the glass through chemical bonding, and can effectively resist the damage to the interface caused by wet and hot aging, thereby significantly improving the interface bonding performance and long-term reliability of the POE film under wet and hot aging environment.

[0111] By comparing Example 1 and Comparative Example 4, it can be seen that when the grafting rate of the POE silane grafted material exceeds 4.0%, the peel strength of the high-bonding POE film B4 prepared therefrom with the glass before aging is 145.4 N / cm, which is much lower than A1 (162.3 N / cm). At the same time, after aging with PCT48H (121°C / 100%RH) and DH2000H (85°C / 85%RH), the peel strength retention rates are 57.9% and 37.3%, which are also much lower than A1 (92.7%, 79%), indicating that the higher the grafting rate of the POE silane grafted material, the better. When the grafting rate exceeds 4.0%, the bonding durability between the material and the glass deteriorates, and it cannot effectively resist the damage to the interface caused by wet and hot aging.

[0112] The above further describes the present invention in conjunction with specific embodiments. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solutions of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, and such modifications and replacements shall fall within the scope of protection of the present invention.

Claims

1. A high-bonding POE film, characterized in that: Including POE resin, POE silane grafted material, initiator, co-crosslinking agent, UV stabilizer, antioxidant and silane coupling agent; The weight ratio of the POE resin to the POE silane grafted material is 100:1-10; The grafting rate of the POE silane grafted material is 2.5%-4.0%, and PDI is ≤1.8; The preparation method of the POE silane grafted material comprises the following steps: (1) POE resin, double bond silane coupling agent and grafting initiator are mixed uniformly to obtain a premix; (2) The premix undergoes grafting reaction under shearing action, and is cooled and pelletized to obtain POE silane grafted material; The weight ratio of the POE resin, double bond silane coupling agent and grafting initiator in step (1) is 100:1-10:0.01-3; The melt index value of the POE resin in step (1) is 1-30 g / 10 min; The parameters of the twin-screw extruder used for the grafting reaction of the premix under shearing in step (2) are 1.38-1.42 OD / ID; the temperature of the grafting reaction in step (2) is 140-200°C.

2. The high-bonding POE film according to claim 1, characterized in that: The double bond silane coupling agent in step (1) is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(2-methoxyethoxy)silane, γ-(methacryloyloxy)propyltrimethoxysilane, and acrylmethyldimethoxysilane; The grafting initiator is at least one of diisopropylbenzene peroxide, tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, and 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

3. The high-bonding POE film according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of POE resin, 1-10 parts of POE silane grafting material, 0.5-1.5 parts of initiator, 0.4-2.2 parts of auxiliary cross-linking agent, 0.01-0.5 parts of UV stabilizer, 0.01-0.5 parts of antioxidant and 0.01-0.5 parts of silane coupling agent.

4. The high-bonding POE film according to claim 1, characterized in that: The initiator is at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexyl carbonate, dicumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, 2,5-dimethyl-2,5-di(benzoyl)peroxyhexane, and 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane; The auxiliary cross-linking agent is at least one of triallyl isocyanurate, triallyl cyanurate, trimethallyl isocyanate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, divinylbenzene, glycidyl methacrylate, and ethylene glycol dimethacrylate; The ultraviolet stabilizer is at least one of 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol, 2-(2H-benzotriazole-2-yl)-4,6-di-tert-butylphenol, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate; The antioxidant is at least one of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecanoate, 2,6-di-tert-butyl-4-methylphenol, dilauryl thiodipropionate, tris(2,4-di-tert-butylphenyl) phosphite, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 4,4'-thiobis(6-tert-butyl-m-cresol), tris(nonylphenyl) phosphite, and 4-hydroxy-2,2,6,6-tetramethylpiperidinol; The silane coupling agent is at least one of vinyltriethoxysilane, vinyltrimethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, vinyltriisopropylsilane, 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane.

5. The method for preparing the high-adhesion POE film according to any one of claims 1 to 4, characterized in that: The steps include: S1, mixing POE resin, POE silane grafted material, initiator, co-crosslinking agent, UV stabilizer and antioxidant according to the formula amount to obtain a mixture; S2. The mixed material is kneaded and plasticized, and then cast, embossed, cooled, slit, and rolled to obtain the high-bonding POE film.

6. Use of the high-adhesion POE film according to any one of claims 1 to 4 or the high-adhesion POE film prepared by the preparation method according to claim 5 in photovoltaic module packaging.

7. A photovoltaic module, characterized in that: The invention relates to a high-adhesion POE film according to any one of claims 1 to 4 or a high-adhesion POE film prepared by the preparation method according to claim 5.

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