Plasticizable preparation method of photovoltaic cross-linked adhesive film recycled material and plasticizable recycled product

Abstract

The invention discloses a plasticizable preparation method of a photovoltaic cross-linked adhesive film recycled material and a plasticizable recycled product, aiming at the defect that the existing recycled cross-linked photovoltaic adhesive film material does not have thermoplastic melt processing performance, the preparation method comprises the following steps: firstly, mixing polypropylene wax with cross-linked X-EVA / X-POE powder, and then carrying out heat treatment; the preparation method comprises the following steps: adding a crosslinking agent into a rubber material to improve the compatibility of the rubber material and other raw materials and reduce the thermal strength of rubber film powder, and then breaking a molecular chain of a crosslinking structure under the action of an initiator by utilizing the high-temperature shearing effect of an extruder, so as to realize the degradation and plasticization preparation of a crosslinking material, and re-endowing a recycled material (R-EVA / R-POE) with the characteristic of melt processability. By adjusting and optimizing the used formula, a blending product with better melt flowing property can be screened out, and the blending product can be used as a compatibilizer or a flexibilizer to be applied to polymer alloys and polymer inorganic filling composite materials to generate new economic values.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a method for preparing a plasticized photovoltaic crosslinked film recycling material and the plasticized recycling product. Background Technology

[0002] The role of photovoltaic encapsulation film materials in photovoltaic modules is to bond photovoltaic glass, solar cells, and backsheets together, while also protecting the solar cells and isolating them from air. The main types of encapsulation film materials are EVA film and POE film and their laminated mixtures.

[0003] EVA is a non-toxic, odorless, and transparent thermoplastic elastomer similar to rubber elastomer, obtained by copolymerizing ethylene and vinyl acetate monomers under the action of an initiator. It has excellent flexibility, impact resistance, elasticity, and optical transparency.

[0004] POE is a thermoplastic elastomer produced by in-situ polymerization of ethylene and α-olefins (such as 1-octene). It has excellent weather resistance, ozone resistance, UV resistance and aging resistance, and can maintain its performance stability under harsh environmental conditions.

[0005] In photovoltaic encapsulation films, these two types of materials typically require pretreatment under the action of a crosslinking agent. When the temperature reaches the decomposition temperature of the crosslinking agent, the peroxide bonds in the crosslinking agent break to form peroxide free radicals RO-, which readily combine with the H groups of alkyl groups on the branched chains. After the two alkyl active groups combine, a three-dimensional crosslinked network structure is formed in the structure, giving the encapsulation film material a certain degree of crosslinking and causing it to lose its thermoplastic melt-processable characteristics. After recycling, this crosslinked material for photovoltaic encapsulation cannot be further melt-processed and is currently only disposed of through landfill or incineration. If it needs to be pyrolyzed back to monomers, it usually requires high-energy-consuming methods such as pyrolysis and hydrolysis, but these methods are too costly and have low economic and practical value.

[0006] Therefore, there is an urgent need in this field to develop a method that can change the processing characteristics of cross-linked materials and further transform them into high-value new materials that can be melt-processed, so as to promote the recycling of resources. This method has great environmental significance and market value. Summary of the Invention

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0008] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0009] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a method for plasticizing and preparing photovoltaic crosslinked adhesive film recycling materials.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for plasticizing recycled photovoltaic crosslinked film material, comprising crushing and grinding the recycled crosslinked photovoltaic encapsulation film to obtain crosslinked film powder.

[0011] The cross-linked film powder is thoroughly mixed with a low-melting-point compatibilizer and a co-solvent in a high-speed mixer and then subjected to heat treatment to obtain a modified film powder mixture.

[0012] The film powder modification mixture is uniformly mixed with thermoplastic resin, peroxide initiator, and polymerization inhibitor to obtain a mixture, which, by mass percentage, comprises: 65%–85% cross-linked film powder, 3%–10% low-melting-point compatibilizer, 2%–5% co-solvent, 5%–20% thermoplastic resin, 0.2%–1.0% peroxide initiator, and 0.01%–0.2% polymerization inhibitor.

[0013] The mixture is melt-extruded and granulated using a twin-screw extruder to obtain a flowable recycled product, thus realizing the plasticization preparation of photovoltaic crosslinked film materials.

[0014] As a preferred embodiment of the method for preparing the plasticized photovoltaic crosslinked encapsulating film recycled material according to the present invention, the recycled crosslinked photovoltaic encapsulating film includes one or more of ethylene-vinyl acetate and ethylene-polyolefin elastomer.

[0015] As a preferred embodiment of the plasticization preparation method of the photovoltaic crosslinked film recycled material of the present invention, the recycled crosslinked photovoltaic encapsulation film has a melt index of <0.1g / 10min and a crosslinking degree of 65% to 90% under the conditions of 230℃ and 10kg.

[0016] In a preferred embodiment of the method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material of the present invention, the particle size of the crosslinked adhesive film powder is 20~200 mesh.

[0017] In a preferred embodiment of the method for preparing the plasticized photovoltaic crosslinked film recycling material of the present invention, the low-melting-point compatibilizer is a polypropylene wax with a melting point below 100°C; the co-solvent includes one or more of styrene, α-methylstyrene, and ethylstyrene.

[0018] In a preferred embodiment of the method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material of the present invention, the heat treatment temperature is 60~70℃ and the treatment time is 12~15h.

[0019] In a preferred embodiment of the method for preparing the plasticized photovoltaic crosslinked film recycling material of the present invention, the thermoplastic resin includes one or more of homopolymer polypropylene and copolymer polypropylene.

[0020] As a preferred embodiment of the plasticization preparation method of the photovoltaic crosslinked adhesive film recycling material of the present invention, the peroxide initiator includes one or more of dicumyl peroxide, ditert-pentyl peroxide, and 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane.

[0021] As a preferred embodiment of the method for preparing the plasticizable photovoltaic crosslinked adhesive film recycling material of the present invention, wherein: the mixture is melt-extruded and granulated using a twin-screw extruder, comprising, The mixture is added to the hopper of a twin-screw extruder. The screw speed is controlled at 100~300 r / min, the main screw current at 50%~70%, and the temperatures of each section of the screw are as follows: The temperature ranges from 140 to 170°C in the front section, 170 to 180°C in the middle section, and 180 to 190°C in the rear section. The melt temperature is 160 to 180°C, and the residence time of the melt in the screw is 1 to 2 minutes. After extrusion, the melt is cooled with water and then pelletized.

[0022] Another objective of this invention is to provide a plasticizable recyclable product of photovoltaic crosslinked film recycling material, wherein the photovoltaic crosslinked film recycling material has a melt index of <0.1g / 10min and a crosslinking degree of 65% to 90% under conditions of 230℃ and 10kg before plasticization treatment, and a melt index of >7g / 10min under conditions of 230℃ and 10kg after plasticization treatment.

[0023] Beneficial effects of this invention: (1) This invention proposes a plasticizing preparation method for photovoltaic crosslinked photovoltaic film materials. In view of the defect that the existing recycled crosslinked photovoltaic film materials do not have thermoplastic melt processing performance, this invention first mixes polypropylene wax with crosslinked X-EVA / X-POE powder and then heat-treats it to improve the compatibility of the adhesive with other raw materials and reduce the thermal strength of the film powder. Then, by utilizing the high-temperature shearing effect of the extruder, under the action of the initiator, the molecular chains of the crosslinked structure are broken, thereby realizing the degradation and plasticization preparation of the crosslinked material and giving the recycled material (R-EVA / R-POE) melt-processable characteristics again.

[0024] (2) The waste photovoltaic crosslinking film material used in this invention can be a large amount of recycled pre-crosslinked EVA / POE sheets from industries such as crystalline silicon cell encapsulation and functional films. By adjusting and optimizing the formula used, blend products with good melt flow properties can be screened out. These blends can be used as compatibilizers or toughening agents in polymer alloys and polymer inorganic filler composite materials to generate new economic value. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 A diagram illustrating the reaction mechanism of the components in the process of recovering cross-linked EVA film. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0029] Unless otherwise specified, all raw materials used in this invention are commercially available in the field.

[0030] The photovoltaic crosslinking film material X-EVA used in the specific embodiment of the present invention has a crosslinking degree of 85.2% (the test method for crosslinking degree refers to "Research on the Types and Crosslinking Degrees of Photovoltaic Module Encapsulation Films - Chen Ruyi"), and is pulverized into powder with a particle size of 20~200 mesh.

[0031] The polypropylene wax used in the specific embodiment of the present invention has a melting point of 72°C.

[0032] The polypropylene used in the specific embodiments of the present invention is homopolymer polypropylene, grade Z30S, with a melt index of 30g / 10min.

[0033] The MI test method of this invention refers to ASTM D1238.

[0034] Example 1

[0035] This embodiment provides a method for plasticizing and preparing photovoltaic crosslinked film materials, taking recycled crosslinked EVA film as an example. The reaction mechanism of each component during the processing is as follows: Figure 1 As shown, specifically: 1) Weigh the raw materials according to the following mass percentages, with a total mass of 5 kg: 70% cross-linked recycled EVA powder (X-EVA), 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 20% PP (thermoplastic resin), and 0.2% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator).

[0036] 2) X-EVA powder, α-methylstyrene, and polypropylene wax are thoroughly mixed at room temperature using a high-speed mixer, sealed, and placed in an oven at 65°C for 14 hours to allow the co-solvent to penetrate into the X-EVA powder and the polypropylene wax to adhere to the powder surface, thus obtaining a GX-EVA mixture. 3) GX-EVA is further mixed with PP resin to obtain GX-EVA-PP mixture. 2,5-Dimethyl-2,5-bis(tert-butylperoxide)ethane and benzoquinone are added to the mixture and it is mixed evenly with a high-speed mixer to obtain the final mixture. 4) The mixture is co-extruded and granulated using a twin-screw extruder. The screw speed is controlled at 200 r / min, the main motor current is 60%, and the temperatures of each section of the screw are as follows: The temperature is 160℃ in the front section, 170℃ in the middle section, and 190℃ in the rear section. The melt temperature is 170℃, and the residence time of the melt in the screw is 1.5min. After extrusion, the product is cooled by water and pelletized to obtain a flowable blended modified product, CR-EVA composite material.

[0037] Figure 1 Taking the recycling of cross-linked EVA film as an example, the reaction mechanism of each component during the processing is described. The main reactions of the cross-linked EVA recycled material at each stage are: (a) strong shearing breaks down the cross-linking network of X-EVA and reacts with free radicals; (b) thermal decomposition of peroxides generates a large number of peroxy free radicals (RO); (c) III and IV: RO attacks X-EVA and PP, generating macromolecular free radicals (X-EVA and PP); (d) V→VI: melt penetration and grafting reaction form partially decrosslinked EVA material with enhanced flow.

[0038] Example 2

[0039] The difference between this embodiment and Embodiment 1 is that the raw material formula is adjusted, specifically: Weigh the raw materials according to the following mass percentages, with a total mass of 5 kg: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.5% PP (thermoplastic resin), 0.5% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes are the same as in Example 1, resulting in the blended modified product R-EVA of this example.

[0040] Example 3

[0041] The difference between this embodiment and Embodiment 1 is that the raw material formula is adjusted, specifically: Weigh the raw materials according to the following mass percentages, with a total mass of 5 kg: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.2% PP (thermoplastic resin), 0.8% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes are the same as in Example 1, resulting in the blended modified product R-EVA of this example.

[0042] Example 4

[0043] The difference between this embodiment and Embodiment 1 is that the raw material formula is adjusted, specifically: Weigh the raw materials according to the following mass percentages, with a total mass of 5 kg: 75% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 14.5% PP (thermoplastic resin), 0.5% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes are the same as in Example 1, resulting in the blended modified product R-EVA of this example.

[0044] The melt flow index of the products from Examples 1 to 4 was determined, and the results are shown in Table 1.

[0045] Table 1

[0046] As shown in Table 1, the R-EVA blended modified product obtained by the present invention has a melt index >7.0 g / 10 min under the test conditions of 230℃ and 10 kg. By adjusting the ratio of crosslinking powder material and thermoplastic resin and the amount of initiator added, R-EVA with different flow effects can be obtained, which are significantly improved compared with the untreated recycled product. The effect is best when the amount of initiator added is 0.5%. Excessive addition will cause the active sites generated by the broken molecular chains to re-crosslink, which is not conducive to the improvement of the plasticity of the system. This shows that the present invention can effectively realize the degradation and plasticization of crosslinked materials and re-endow the recycled materials (R-EVA / R-POE) with melt-processable characteristics.

[0047] Comparative Example 1

[0048] In this comparative example, PP resin was replaced with EVA, and the specific formulation is as follows: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.75% EVA (thermoplastic resin), 0.2% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes were all the same as in Example 1, resulting in the blended modified product of this comparative example.

[0049] Comparative Example 2

[0050] In this comparative example, PP resin was replaced with EVA, and the specific formulation is as follows: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.45% EVA (thermoplastic resin), 0.5% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes were all the same as in Example 1, resulting in the blended modified product of this comparative example.

[0051] Comparative Example 3

[0052] In this comparative example, PP resin was replaced with EVA, and the specific formulation is as follows: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.15% EVA (thermoplastic resin), 0.8% 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane (initiator); The remaining steps and processes were all the same as in Example 1, resulting in the blended modified product of this comparative example.

[0053] Comparative Example 4

[0054] In this comparative example, PP resin was replaced with EVA, and the specific formulation is as follows: 70% X-EVA powder, 8% polypropylene wax (compatibilizer), 2% α-methylstyrene (cosolvent), 0.05% benzoquinone (polymerization inhibitor), 19.95% EVA (thermoplastic resin). The remaining steps and processes were all the same as in Example 1, resulting in the blended modified product of this comparative example.

[0055] The melt flow index of the products of Comparative Examples 1 to 4 was determined, and the results are shown in Table 2.

[0056] Table 2

[0057] As shown in Table 2, replacing PP resin with an equal amount of thermoplastic EVA resin significantly reduced the melt index of the resulting blended modified products. This is because the initiator generates a certain concentration of free radicals at high temperatures, which preferentially initiate the chain breaking of PP molecules compared to EVA, forming tertiary carbon free radicals with a longer active lifespan. At the same time, the physical shearing of the crosslinked film under high-temperature melting will cause partial chain breaking of the film's network structure and form film chain-severed free radicals. The higher concentration of tertiary carbon free radicals has a higher probability of combining with the chain-severed film free radicals, terminating further crosslinking of the chain-severed film, thereby increasing the melt index of the product.

[0058] Comparative Example 5

[0059] The difference between this comparative example and Example 2 is that polypropylene wax is omitted and replaced with an equal amount of PP resin. The remaining components and steps are the same as in Example 2, resulting in the blended modified product of this comparative example.

[0060] Comparative Example 6

[0061] The difference between this comparative example and Example 2 is that the initiator 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane, bis25, is replaced with ditert-pentylperoxide (DTAP). The remaining components and process steps are the same as in Example 2, and the blended modified product of this comparative example is obtained.

[0062] Comparative Example 7

[0063] The difference between this comparative example and Example 2 is that the co-solvent α-methylstyrene is reduced and replaced with homopolymer PP component. The remaining components and process steps are the same as in Example 2, resulting in the blended modified product of this comparative example.

[0064] Comparative Example 8

[0065] The difference between this comparative example and Example 2 is that the co-solvent α-methylstyrene is added, the homopolymer PP component is reduced proportionally, and the remaining components and process steps are the same as in Example 2, resulting in the blended modified product of this comparative example.

[0066] The melt flow index of the products of Comparative Examples 5 to 8 was measured and compared with that of Example 2. The results are shown in Table 3.

[0067] Table 3

[0068] Table 3 shows that Comparative Example 5, which is the cross-linked plasticized X-EVA material without added PP wax, exhibits a significant decrease in melt index. This may be because the low-melting-point PP wax, at high temperatures, helps to solubilize the high molecular weight PP and X-EVA resin, thereby enhancing the plasticization of X-EVA. Comparative Example 7 indicates that adding low-molecular-weight unsaturated co-solvents, such as α-methylstyrene, can plasticize X-EVA resin, i.e., reduce the strength of X-EVA resin at high temperatures, leading to chain scission of cross-linked EVA under high shear. Simultaneously, the free radicals formed by the chain-scissed X-EVA can further initiate cross-linking of unsaturated bonds, reducing the probability of further cross-linking of the cross-linked film. In Comparative Example 8, excessive low-molecular-weight co-solvent content easily volatilizes or remains at high temperatures, ultimately leading to a deterioration of the production environment.

[0069] In summary, this invention proposes a plasticizing preparation method for photovoltaic crosslinked photovoltaic film materials. Addressing the deficiency of existing recycled crosslinked photovoltaic film materials lacking thermoplastic melt processing properties, this invention first mixes polypropylene wax with crosslinked X-EVA / X-POE powder and then heat-treats the mixture to improve the compatibility of the compound with other raw materials and reduce the thermal strength of the film powder. Then, utilizing the high-temperature shearing effect of the extruder, under the action of an initiator, the molecular chains of the crosslinked structure are broken, achieving the degradation and plasticization of the crosslinked material, thus restoring the melt-processable properties of the recycled material (R-EVA / R-POE).

[0070] The waste photovoltaic crosslinked film material used in this invention can be a large amount of recycled pre-crosslinked EVA / POE sheets from industries such as crystalline silicon cell encapsulation and functional films. By adjusting and optimizing the formula, blend products with good melt flow properties can be screened out. These blends can be used as compatibilizers or toughening agents in polymer alloys and polymer inorganic filler composite materials, generating new economic value.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a plasticized photovoltaic crosslinked adhesive film recycling material, characterized in that: include, The recovered cross-linked photovoltaic encapsulating film was crushed and ground into powder to obtain cross-linked film powder. The cross-linked film powder was thoroughly mixed with a low-melting-point compatibilizer and a co-solvent in a high-speed mixer and then subjected to heat treatment to obtain a modified film powder mixture. The modified film powder mixture is uniformly mixed with thermoplastic resin, peroxide initiator, and polymerization inhibitor to obtain a mixture, which, by mass percentage, comprises: 65%–85% cross-linked film powder, 3%–10% low-melting-point compatibilizer, 2%–5% co-solvent, 5%–20% thermoplastic resin, 0.2%–1.0% peroxide initiator, and 0.01%–0.2% polymerization inhibitor. The mixture is melt-extruded and granulated using a twin-screw extruder to obtain a flowable recycled product, thus realizing the plasticization preparation of photovoltaic crosslinked film materials.

2. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 1, characterized in that: The recycled cross-linked photovoltaic encapsulating film includes one or more of ethylene-vinyl acetate and ethylene-polyolefin elastomer.

3. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 2, characterized in that: The recovered cross-linked photovoltaic encapsulating film has a melt index of <0.1g / 10min and a cross-linking degree of 65% to 90% under conditions of 230℃ and 10kg.

4. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 1, characterized in that: The cross-linked film powder has a particle size of 20~200 mesh.

5. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 1, characterized in that: The low-melting-point compatibilizer is a polypropylene wax with a melting point below 100°C; the co-solvent includes one or more of styrene, α-methylstyrene, and ethylstyrene.

6. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 1, characterized in that: The heat treatment temperature is 60~70℃, and the treatment time is 12~15h.

7. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 6, characterized in that: The thermoplastic resin includes one or more of homopolymer polypropylene and copolymer polypropylene.

8. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 7, characterized in that: The peroxide initiator includes one or more of dicumyl peroxide, ditert-pentyl peroxide, and 2,5-dimethyl-2,5-bis(tert-butylperoxide)ethane.

9. The method for preparing the plasticized photovoltaic crosslinked adhesive film recycling material as described in claim 1, characterized in that: The mixture is melt-extruded and granulated using a twin-screw extruder, comprising: The mixture is added to the hopper of a twin-screw extruder. The screw speed is controlled at 100~300 r / min, the main screw current at 50%~70%, and the temperatures of each section of the screw are as follows: The temperature ranges from 140 to 170°C in the front section, 170 to 180°C in the middle section, and 180 to 190°C in the rear section. The melt temperature is 160 to 180°C, and the residence time of the melt in the screw is 1 to 2 minutes. After extrusion, the melt is cooled with water and then pelletized.

10. A plasticizable recyclable product of a photovoltaic crosslinked adhesive film recycling material, characterized in that: The plasticized recycled product after any one of the plasticization treatments according to claims 1 to 9 has a melt index >7 g / 10 min at 230°C and 10 kg.

Images