A co-extruded film for special power generation building materials and its preparation method

Abstract

This application relates to a coextrusion film for power generation building materials and its preparation method in the technical field of coextrusion film. The coextrusion film for power generation building materials includes a PET layer and POE film layers arranged on opposite sides of the PET layer. By weight, the preparation raw materials of the PET layer include the following components: 60-100 parts of PET, 4-12 parts of modified nano-cubic boron nitride, 1-3 parts of dispersant, 0.5-2 parts of decyl epoxy oleate, 1-3 parts of antioxidant, and 0.5-2 parts of polyethylene wax; the modified nano-cubic boron nitride is nano-cubic boron nitride grafted with polypropylene glycol diglycidyl ether. This application enhances the mechanical strength of the PET layer by adding modified nano-cubic boron nitride. At the same time, the nano-material can improve the density of the coextrusion film, thereby enhancing its water vapor barrier property, while the POE film layer has good weather resistance, UV resistance, and anti-PID performance.

Description

Technical Field

[0001] The present application relates to the technical field of co-extruded films, and in particular to a co-extruded film for power generation building materials and a preparation method thereof. Background Art

[0002] As an energy-saving and environment-friendly product, solar panels have been widely used in various fields in recent years, especially in the field of building-integrated photovoltaics. A new type of power generation building material that combines building materials with solar photovoltaic technology has begun to be applied. The structure of a solar panel sequentially includes photovoltaic glass, an EVA film, solar cells, an EVA film, and a backplane. Among them, due to the poor performance of the EVA film, it cannot meet the requirements for improving the power generation efficiency of photovoltaic modules. Therefore, in recent years, a co-extruded POE film (EPE film) is usually used to replace the EVA film.

[0003] The EPE film is manufactured by a co-extrusion process of three-layer composite of EVA film - POE film - EVA film. Its performance is between that of the EVA film and the POE film. It is a type of photovoltaic film used in the encapsulation link of photovoltaic modules, between tempered glass - battery - backplane, playing a buffering and protective role, and is one of the key materials for photovoltaic modules.

[0004] However, the water vapor barrier property and mechanical properties of the EPE film are poor, which makes the solar panel prone to the PID effect (potential-induced degradation), resulting in a significant attenuation of its power and even affecting its service life. Especially when applied to power generation building materials combined with building materials, due to the characteristics of building waterproofing, electrical safety requirements, and difficult maintenance, the above problems become more prominent. Therefore, developing a co-extruded film for power generation building materials with excellent water vapor barrier property, insulation property, and mechanical properties is an urgent problem to be solved at present. Summary of the Invention

[0005] In order to solve the problem of how to improve the water vapor barrier property and mechanical properties of the co-extruded film for power generation building materials, the present application provides a co-extruded film for power generation building materials and a preparation method thereof. In the present application, the co-extruded film for power generation building materials has a three-layer structure, namely a PET layer and POE film layers arranged on opposite sides of the PET layer. By adding modified nano-cubic boron nitride, the mechanical strength of the PET layer is enhanced, and at the same time, the nano material can improve the density of the co-extruded film, thereby improving its water vapor barrier property. The POE film layer has good weather resistance, ultraviolet resistance, and anti-PID performance. Thus, the co-extruded film in the present application has excellent water vapor barrier property, insulation property, and mechanical properties.

[0006] In the first aspect, the present application provides a co-extruded film for power generation building materials, adopting the following technical solution:

[0007] A co-extruded film dedicated to power generation building materials, the co-extruded film dedicated to power generation building materials includes a PET layer and POE film layers provided on opposite sides of the PET layer. By weight, the preparation raw materials of the PET layer include the following components: 60-100 parts of PET, 4-12 parts of modified nano-cubic boron nitride, 1-3 parts of dispersant, 0.5-2 parts of decyl epoxy oleate, 1-3 parts of antioxidant, and 0.5-2 parts of polyethylene wax;

[0008] The modified nano-cubic boron nitride is nano-cubic boron nitride grafted with polypropylene glycol diglycidyl ether;

[0009] The dispersant includes lauryl polyoxyethylene ether phosphate monoester and cocamidopropyl betaine;

[0010] The POE film layer includes the following raw materials by weight: 70-110 parts of POE, 1-3 parts of pentaerythritol stearate, 0.5-1.5 parts of initiator, 0.5-1.2 parts of crosslinking agent, 0.5-1.5 parts of anilinomethyltriethoxysilane, 0.2-0.7 parts of 2-hydroxy-4-n-octyloxybenzophenone, and 0.2-0.8 parts of antioxidant.

[0011] By adopting the above technical solution, the modified nano-cubic boron nitride has very high hardness, good wear resistance, and excellent chemical stability, and can significantly improve the mechanical properties of the PET layer. The nano-scale cubic boron nitride can also improve the density of the PET layer, thereby improving its water vapor barrier property. After grafting with polypropylene glycol diglycidyl ether, the nano-cubic boron nitride is provided with polar groups, thereby improving the compatibility of the nano-cubic boron nitride with PET and further improving the mechanical strength and water vapor barrier property of the PET layer. The POE film layer has good mechanical properties, lower water vapor transmission rate, and excellent anti-UV performance, can relieve part of the impact force for the PET layer, isolate the entry of water vapor, and improve the anti-PID performance of the co-extruded film.

[0012] Lauryl polyoxyethylene ether phosphate monoester can reduce the agglomeration phenomenon between the modified nano-cubic boron nitride particles, so that the modified nano-cubic boron nitride can be evenly mixed with other materials, while cocamidopropyl betaine has excellent stability, and the compounding with lauryl polyoxyethylene ether phosphate monoester can improve the dispersion stability of the modified nano-cubic boron nitride, so as to be more evenly mixed with other materials, and further improve the mechanical strength and water vapor barrier property of the PET layer.

[0013] The addition of a small amount of decyl epoxy oleate can increase the mobility of PET molecular chains, improve the processing performance of PET, and enhance the elongation at break and flexibility of the PET layer. The antioxidant can improve the aging resistance of the PET layer and the POE film layer, and extend the service life of the co-extruded film for power generation building materials. In addition, POE, pentaerythritol stearate, and the initiator can react during the melt extrusion process to introduce polar groups onto POE, improving the compatibility of POE with other raw materials, while 2-hydroxy-4-n-octyloxybenzophenone can enhance the UV resistance of the POE film layer.

[0014] In this application, the antioxidant is selected from one or more of 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (antioxidant 1010), and N,N'-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine (antioxidant 1098); the initiator is selected from one or more of dicumyl peroxide, benzoyl peroxide, and tert-butyl peroxy pivalate; the crosslinking agent is selected from one or more of triallyl cyanurate, triallyl isocyanurate, and 1,3,5-triacryloylhexahydro-1,3,5-triazine.

[0015] Preferably: the mass ratio of the modified nano-cubic boron nitride to the PET is 1:(8 - 15).

[0016] By adopting the above technical solution, by adjusting the addition amount of the modified nano-cubic boron nitride, while enhancing the mechanical strength of the PET layer, the production cost is minimized as much as possible.

[0017] In some specific embodiments, the mass ratio of the modified nano-cubic boron nitride to the PET is 1:(10 - 13).

[0018] Preferably: the mass ratio of the lauryl polyoxyethylene ether phosphate monoester to the cocamidopropyl betaine is (1 - 4):1.

[0019] By adopting the above technical solution, controlling the mass ratio of the lauryl polyoxyethylene ether phosphate monoester to the cocamidopropyl betaine within the above range helps the modified nano-cubic boron nitride to be evenly mixed with other raw materials, further enhancing the mechanical strength and water vapor barrier property of the PET layer.

[0020] In some preferred embodiments, the mass ratio of the lauryl polyoxyethylene ether phosphate monoester to the cocamidopropyl betaine can be 2:1, 3:1, or 4:1, etc.

[0021] Preferably: the modified nano-cubic boron nitride is prepared by the following steps:

[0022] S1. Add nano-cubic boron nitride and polypropylene glycol diglycidyl ether into an ethanol solution with a volume fraction of 70%-90% for ultrasonic dispersion. After introducing nitrogen, send it into a cobalt source for irradiation to obtain a graft-modified solution.

[0023] S2. Centrifuge the graft-modified solution, wash the precipitate with chloroform, then freeze-dry the precipitate and pulverize it to obtain modified nano-cubic boron nitride.

[0024] By adopting the above technical solution, polypropylene glycol diglycidyl ether is used to carry out irradiation graft modification on nano-cubic boron nitride, introducing polar groups onto the nano-cubic boron nitride, enhancing the compatibility between the nano-cubic boron nitride and PET, contributing to the mixing of the PET layer raw materials, and thus enhancing the mechanical strength and water resistance of the co-extruded film for power generation building materials.

[0025] In some specific embodiments, 3 ml of an ethanol solution with a volume fraction of 75% is added to every 1 g of nano-cubic boron nitride.

[0026] Preferably, the mass ratio of the nano-cubic boron nitride to the polypropylene glycol diglycidyl ether is (5-20):1.

[0027] By adopting the above technical solution, further adjusting the mass ratio of the nano-cubic boron nitride to the polypropylene glycol diglycidyl ether helps to improve the graft modification effect of the nano-cubic boron nitride, thereby improving the compatibility between the nano-cubic boron nitride and PET.

[0028] In some preferred embodiments, the mass ratio of the nano-cubic boron nitride to the polypropylene glycol diglycidyl ether can be 10:1, 15:1 or 20:1, etc.

[0029] Preferably, the thickness of the PET layer is 20%-40% of the total thickness of the co-extruded film, and the thickness of each POE film layer is 20%-30% of the total thickness of the co-extruded film.

[0030] In some preferred embodiments, the thickness of the PET layer is 40% of the total thickness of the co-extruded film, and the thickness of each POE film layer is 30% of the total thickness of the co-extruded film.

[0031] Preferably, the raw materials of the POE film layer further include the following raw materials in parts by weight: 8-20 parts of gelatin, 2-4 parts of glycerol, and 1-3 parts of sorbitan tetraoleate.

[0032] By adopting the above technical solution, gelatin particles can attract each other to form a network structure, playing a role of a supporting framework in the POE film layer. The compounding of glycerol and sorbitan tetraoleate can better improve the elongation at break of the gelatin film and increase the toughness of the gelatin film after film formation, thereby enhancing the mechanical properties of the POE film layer.

[0033] Preferably, the mass ratio of the gelatin, glycerol, and sorbitan tetraoleate is (6 - 10):(1 - 3):1.

[0034] By adopting the above technical solution, further adjusting the mass ratio of the gelatin, glycerol, and sorbitan tetraoleate helps to enhance the toughness of the gelatin film and improve the mechanical properties of the POE film layer.

[0035] In some preferred embodiments, the mass ratio of the gelatin, glycerol, and sorbitan tetraoleate can be 8:2:1, 6:1.5:1, 10:3:1, etc.

[0036] In a second aspect, the present application provides a method for preparing a coextruded film for power generation building materials, adopting the following technical solution:

[0037] A method for preparing a coextruded film for power generation building materials, which comprises the following steps:

[0038] T1. Melting and extruding PET, modified nano-cubic boron nitride, a dispersant, decyl epoxy oleate, an antioxidant, and polyethylene wax, then blow-molding, longitudinally stretching, transversely stretching, and winding up after heat setting treatment to obtain a PET layer;

[0039] T2. Subjecting the PET layer to corona treatment to obtain a pretreated PET layer;

[0040] T3. Melting and mixing POE, pentaerythritol stearate, an initiator, a crosslinking agent, aniline methyl triethoxysilane, 2-hydroxy-4-n-octyloxy benzophenone, and an antioxidant, and then putting them together with the pretreated PET layer into a lamination machine for composite casting and lamination, cooling and pressing for shaping, slitting, and winding up to obtain the coextruded film for power generation building materials.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. The present application adopts a three-layer coextruded film structure of POE film layer - PET layer - POE film layer. Among them, the POE film layer has a low water vapor transmission rate, anti-ultraviolet performance, and excellent anti-PID performance. In the PET layer, due to the addition of modified nano-cubic boron nitride, while improving the compressive strength of the PET layer, it can also improve its density, making it have better mechanical properties and water vapor barrier properties;

[0043] 2. The present application irradiates and grafts modifies nano-cubic boron nitride with polypropylene glycol diglycidyl ether, introducing polar groups onto the nano-cubic boron nitride, improving the compatibility between the nano-cubic boron nitride and PET, and helping to improve the mechanical strength of the PET layer;

[0044] 3. In this application, lauryl alcohol polyoxyethylene ether phosphate monoester and cocamidopropyl betaine are compounded as dispersants, effectively improving the dispersion stability of modified nano-cubic boron nitride, so as to mix more uniformly with other materials and further improve the mechanical strength of the PET layer. Detailed implementation manners

[0045] To make this application easier to understand, the following will further describe this application in detail with reference to embodiments. These embodiments are only illustrative and not limited to the application scope of this application. The raw materials or components used in this application can be obtained through commercial channels or conventional methods without special instructions.

[0046] Source of raw materials

[0047] PET was purchased from Dongguan Longyan Plastic Raw Materials Co., Ltd.; lauryl alcohol polyoxyethylene ether phosphate monoester was purchased from Anhui Banghao Chemical Co., Ltd.; POE was purchased from Guangzhou Hongcheng Plasticizing Co., Ltd.; polypropylene glycol diglycidyl ether was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.; gelatin was purchased from Shandong Pingju Biotechnology Co., Ltd.; polyethylene wax was purchased from Changzhou Jiujiu Chemical Co., Ltd.; lauryl alcohol polyoxyethylene ether phosphate monoester was purchased from Nantong Aches Chemical Co., Ltd.; glycerol was purchased from Changzhou Jiujiu Chemical Co., Ltd.

[0048] Preparation Example 1

[0049] The modified nano-cubic boron nitride in Preparation Example 1 was prepared by the following preparation method:

[0050] 15 kg of nano-cubic boron nitride and 1 kg of polypropylene glycol diglycidyl ether were added to 45 L of an ethanol solution with a volume fraction of 75% and ultrasonically dispersed. It should be noted that the ultrasonic power was 240 W, the ultrasonic temperature was 40 °C, and the ultrasonic time was 40 min. The mass ratio of nano-cubic boron nitride to polypropylene glycol diglycidyl ether was 15:1. Then, nitrogen was introduced for 15 min and then sent to a cobalt source for irradiation for 10 h, and the irradiation dose was 15 kGy to obtain a graft-modified solution. Subsequently, the graft-modified solution was centrifuged, and the precipitate was washed twice with chloroform. The precipitate was freeze-dried at -40 °C for 12 h and then pulverized to obtain modified nano-cubic boron nitride.

[0051] Preparation Examples 2-3

[0052] The preparation methods of the modified nano-cubic boron nitride in Preparation Examples 2-3 were the same as those in Preparation Example 1, except that the amounts of polypropylene glycol diglycidyl ether used were 1.5 kg and 0.75 kg, respectively. That is, the mass ratios of nano-cubic boron nitride to polypropylene glycol diglycidyl ether were 10:1 and 20:1.

[0053] Example 1

[0054] In Example 1, the coextrusion film for power generation building materials includes a PET layer and POE film layers disposed on opposite sides of the PET layer, and has a three-layer structure of POE film layer - PET layer - POE film layer. It should be noted that the thickness of the PET layer is 40% of the total thickness of the coextrusion film, and the thickness of each POE film layer is 30% of the total thickness of the coextrusion film. The preparation raw materials and their dosages of the PET layer are shown in Table 1. Among them, the modified nano-cubic boron nitride is the modified nano-cubic boron nitride prepared in Preparation Example 1. The mass ratio of the modified nano-cubic boron nitride to PET is 1:10, and the mass ratio of lauryl alcohol polyoxyethylene ether phosphate monoester to cocoamidopropyl betaine is 2:1. The preparation raw materials of the POE film layer include the following components: 90 parts of POE, 2 parts of pentaerythritol stearate, 1 part of dicumyl peroxide, 0.9 part of triallyl cyanurate, 1 part of anilinomethyltriethoxysilane, 0.5 part of 2-hydroxy-4-n-octyloxybenzophenone, and 0.5 part of antioxidant 1010.

[0055] The preparation method of the coextrusion film for power generation building materials is as follows: Mix the preparation raw materials of the PET layer evenly and then put them into a twin-screw extruder for melt extrusion, blown film forming, longitudinal stretching, transverse stretching, and winding after sizing treatment to obtain the PET layer. Then, corona treatment is performed on the PET layer with a corona power of 1.5 KVA and a corona time of 40 s to obtain a pretreated PET layer. After melting and mixing the preparation raw materials of the POE film layer, they are put into a laminating machine together with the pretreated PET layer for composite casting and laminating, cooled and pressed for sizing at a temperature of 25 °C, slit and wound to obtain the coextrusion film for power generation building materials.

[0056] Table 1. Preparation raw materials and their dosages (kg) of the PET layer in Examples 1 - 7

[0057]

[0058] Examples 2 - 3

[0059] In Examples 2 - 3, the preparation raw materials and their dosages of the PET layer of the coextrusion film for power generation building materials are shown in Table 1, and the rest are the same as in Example 1.

[0060] Examples 4 - 5

[0061] The differences between Examples 4 - 5 and Example 1 are that the mass ratios of the modified nano-cubic boron nitride to PET are 1:12 and 1:15 respectively, and the rest are the same as in Example 1.

[0062] Examples 6 - 7

[0063] The differences between Examples 6 - 7 and Example 4 are that the mass ratios of lauryl alcohol polyoxyethylene ether phosphate monoester to cocoamidopropyl betaine are 3:1 and 4:1 respectively, and the rest are the same as in Example 4.

[0064] Examples 8 - 9

[0065] The differences between Examples 8 - 9 and Example 6 are that the modified nano - cubic boron nitride is the modified nano - cubic boron nitride prepared in Preparation Example 2 and Preparation Example 3 respectively, and the rest is the same as Example 6.

[0066] Examples 10 - 12

[0067] The raw materials for preparing the POE film layer of the co - extruded film special for power - generating building materials in Examples 10 - 12 are shown in Table 2. The differences between it and Example 6 are that gelatin, glycerol and sorbitan tetraoleate are also added to the raw materials for preparing the POE film layer, and the mass ratios of gelatin, glycerol and sorbitan tetraoleate are 8:2:1, 6:1.5:1 and 10:3:1 respectively. The rest is the same as Example 6.

[0068] Table 2. Raw materials for preparing the POE film layer in Examples 10 - 12 (kg)

[0069] Example 10 Example 11 Example 12 POE 90 90 90 Pentaerythritol stearate 2 2 2 Dicumyl peroxide 1 1 1 Triallyl cyanurate 0.9 0.9 0.9 Anilinomethyltriethoxysilane 1 1 1 2-Hydroxy-4-n-octyloxybenzophenone 0.5 0.5 0.5 Antioxidant 1010 0.5 0.5 0.5 Gelatin 15 15 15 Glycerol 3.75 3.75 4.5 Sorbitan tetraoleate 1.875 2.5 1.5

[0070] Comparative Example 1

[0071] The differences between Comparative Example 1 and Example 1 are that the modified nano - cubic boron nitride is replaced with nano - cubic boron nitride in equal amount, and the rest is the same as Example 1.

[0072] Comparative Example 2

[0073] The differences between Comparative Example 2 and Example 6 are that the dosage of lauryl polyoxyethylene ether phosphate monoester is 2 kg and the dosage of cocamidopropyl betaine is 0, and the rest is the same as Example 6.

[0074] Comparative Example 3

[0075] The differences between Comparative Example 3 and Example 6 are that the dosage of cocamidopropyl betaine is 2 kg and the dosage of lauryl polyoxyethylene ether phosphate monoester is 0, and the rest is the same as Example 6.

[0076] Test Example

[0077] The performance of Examples 1 - 12 and Comparative Examples 1 - 3 was detected, specifically including tensile strength, elongation at break, impact strength (notched Izod impact strength) and water vapor transmission rate. Among them, the tensile strength and elongation at break were detected with reference to GB / T 13022 - 1991 "Test Method for Tensile Properties of Plastic Films", the impact strength was detected with reference to GB / T 1843 - 1996 "Plastics - Izod Impact Test", the pendulum energy was 2.75 J, and the water vapor transmission rate was detected with reference to GB / T 26253 - 2010 "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets - Infrared Detector Method". The test results are shown in Table 3.

[0078] Table 3

[0079]

[0080] According to the test results in Table 3, the tensile strength of the co-extruded film for power generation building materials prepared in Examples 1-12 and Comparative Examples 1-3 is 158-265 MPa, the elongation at break is 67.2%-148.9%, and the impact strength is 2.8-5.4 KJ / m 2 , and the water vapor transmission rate is 0.75-2.08 g / (m 2 ·24 h).

[0081] From the test data of Examples 1-3 and Comparative Example 1, it can be seen that after nano-cubic boron nitride is graft-modified with polypropylene glycol diglycidyl ether, its compatibility with PET can be significantly improved, so that the modified nano-cubic boron nitride can be more uniformly mixed in the PET layer, improving the mechanical strength and water vapor barrier property of the PET layer. Especially for the co-extruded film for power generation building materials prepared according to the preparation raw materials and their dosages in Example 1, its mechanical strength and water vapor barrier property are better.

[0082] From the test data of Examples 1, 4 and 5, it can be seen that when the mass ratio of modified nano-cubic boron nitride to PET in the preparation raw materials of the PET layer is 1:12, the mechanical strength and water vapor barrier property of the co-extruded film for power generation building materials can be significantly improved while saving production costs as much as possible.

[0083] From the test data of Examples 4, 6-7 and Comparative Examples 2-3, it can be seen that there is a synergistic effect between lauryl polyoxyethylene ether phosphate monoester and cocamidopropyl betaine, which can improve the dispersion stability of modified nano-cubic boron nitride, make it mix more uniformly with other raw materials, and further improve the mechanical strength and water vapor barrier property of the PET layer. When the mass ratio of lauryl polyoxyethylene ether phosphate monoester to cocamidopropyl betaine is 3:1, the synergistic effect between the two is better, further improving the dispersion stability of modified nano-cubic boron nitride.

[0084] From the test data of Examples 6, 10-12, it can be seen that after adding gelatin, glycerol and sorbitan tetraoleate to the POE adhesive layer, the tensile strength and elongation at break of the co-extruded film for power generation building materials can be significantly improved. When the mass ratio of gelatin, glycerol and sorbitan tetraoleate is 6:1.5:1, the toughness of the co-extruded film for power generation building materials can be better improved, thereby improving its mechanical properties.

[0085] It can be seen from the detection data of Examples 6 and 8-9 that when preparing modified nano-cubic boron nitride, when the mass ratio of nano-cubic boron nitride to polypropylene glycol diglycidyl ether is 15:1, the compatibility between nano-cubic boron nitride and PET can be more significantly improved, thereby helping to enhance the mechanical properties of the PET layer.

[0086] It should be noted that the above-described embodiments are only used to explain the present application and do not constitute any limitation to the present application. The present application has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present application within the scope of the claims of the present application as provided, and the present invention can be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same function.

Claims

1. A co-extruded film dedicated to power generation building materials, characterized in that: The coextrusion film for power generation building materials includes a PET layer and POE film layers provided on opposite sides of the PET layer. By weight, the preparation raw materials of the PET layer include the following components: 60 - 100 parts of PET, 4 - 12 parts of modified nano - cubic boron nitride, 1 - 3 parts of dispersant, 0.5 - 2 parts of decyl epoxy oleate, 1 - 3 parts of antioxidant, and 0.5 - 2 parts of polyethylene wax; The modified nano - cubic boron nitride is nano - cubic boron nitride grafted with polypropylene glycol diglycidyl ether; the mass ratio of the modified nano - cubic boron nitride to the PET is 1:(8 - 15); The dispersant includes lauryl polyoxyethylene ether phosphate monoester and cocamidopropyl betaine; the mass ratio of lauryl polyoxyethylene ether phosphate monoester to cocamidopropyl betaine is (1 - 4):1; The POE film layer includes the following preparation raw materials by weight: 70 - 110 parts of POE, 1 - 3 parts of pentaerythritol stearate, 0.5 - 1.5 parts of initiator, 0.5 - 1.2 parts of cross - linker, 0.5 - 1.5 parts of anilinomethyltriethoxysilane, 0.2 - 0.7 parts of 2 - hydroxy - 4 - n - octyloxybenzophenone, and 0.2 - 0.8 parts of antioxidant.

2. The co-extruded film for power generation building materials according to claim 1, wherein: The modified nano - cubic boron nitride is prepared through the following steps: S1. Add nano - cubic boron nitride and polypropylene glycol diglycidyl ether into an ethanol solution with a volume fraction of 70% - 90%, ultrasonically disperse, introduce nitrogen, and then send it to a cobalt source for irradiation to obtain a graft - modified solution; S2. Centrifuge the graft - modified solution, wash the precipitate with chloroform, then freeze - dry the precipitate, and pulverize it to obtain the modified nano - cubic boron nitride.

3. The co-extruded film for power generation building materials according to claim 2, wherein: The mass ratio of the nano - cubic boron nitride to the polypropylene glycol diglycidyl ether is (5 - 20):

1.

4. The coextrusion film for power generation building materials according to any one of claims 1-3, characterized in that: The thickness of the PET layer is 20% - 40% of the total thickness of the coextrusion film, and the thickness of each POE film layer is 20% - 30% of the total thickness of the coextrusion film.

5. The co-extruded film for power generation building materials according to claim 1, wherein: The raw materials of the POE film layer also include the following raw materials by weight: 8 - 20 parts of gelatin, 2 - 4 parts of glycerol, and 1 - 3 parts of sorbitan tetraoleate.

6. The co-extruded film for power generation building materials according to claim 5, wherein: The mass ratio of the gelatin, glycerol, and sorbitan tetraoleate is (6 - 10):(1 - 3):

1.

7. A method for preparing a co-extruded film specifically for power generation building materials according to any one of claims 1-6, characterized in that: It includes the following steps: T1. Melt - extrude PET, modified nano - cubic boron nitride, dispersant, decyl epoxy oleate, antioxidant, and polyethylene wax, blow - mold, longitudinally stretch, transversely stretch, perform a shaping treatment, and then wind up to obtain the PET layer; T2. Perform a corona treatment on the PET layer to obtain a pretreated PET layer; T3. Melt - mix POE, pentaerythritol stearate, initiator, cross - linker, anilinomethyltriethoxysilane, 2 - hydroxy - 4 - n - octyloxybenzophenone, and antioxidant, and then put them together with the pretreated PET layer into a laminating machine for composite casting and laminating, cool and press for shaping, slit, and wind up to obtain the coextrusion film for power generation building materials.

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