Cross-linked packaging adhesive film composition, cross-linked packaging adhesive film, preparation method of cross-linked packaging adhesive film and photovoltaic module

Abstract

The invention provides a cross-linked packaging adhesive film composition, a cross-linked packaging adhesive film, a preparation method of the cross-linked packaging adhesive film and a photovoltaic module. The cross-linking type packaging adhesive film composition is prepared from the following components in parts by weight: 100 parts of matrix resin, 0.05 to 5 parts of an auxiliary agent and 0.3 to 5 parts of an assistant cross-linking agent, wherein the auxiliary cross-linking agent comprises an auxiliary cross-linking agent S, the auxiliary cross-linking agent S is an oligomer or a polymer formed by an auxiliary cross-linking agent monomer, and the auxiliary cross-linking agent monomer comprises a triallyl isocyanurate monomer and / or a triallyl cyanurate monomer. According to the invention, while the crosslinking rate of the adhesive film is ensured, the phenomena of adhesive film slippage, non-uniform crosslinking degree and the like caused by migration of the assistant crosslinking agent to the surface of the adhesive film are greatly reduced, the problem of easy precipitation of the assistant in the packaging adhesive film in the prior art is solved, the overall performance of the packaging adhesive film is further ensured, and the reliability of the photovoltaic module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of encapsulation films, and in particular, to a crosslinked encapsulation film composition, a crosslinked encapsulation film, a preparation method thereof, and a photovoltaic module. Background Art

[0002] Polyolefin elastomer (POE) is a kind of polymer obtained by blending one or several of polyethylene, polypropylene, polyethylene-octene copolymer, and ethylene-butene copolymer. As an encapsulation film, it is widely used in the field of solar cell encapsulation, and has excellent properties such as low water vapor permeability and anti-PID, and has stable chemical properties and good processability. In a series of additive systems with poor compatibility with POE, the co-crosslinking agent is an extremely important additive for improving the crosslinking degree of POE and enhancing its mechanical properties. However, polyolefins are basically composed of saturated hydrocarbons with low polarity and poor compatibility with many functional additives. Such additives mixed in polyolefins are prone to migrate to the film surface during storage, resulting in a decrease in film roughness, a decrease in the friction between the film and glass and solar cells, and at the same time, the crosslinking degree and crosslinking uniformity are easily affected, thereby affecting the relevant properties of the film and different substrates, leading to quality problems such as bubbles and delamination, affecting the appearance, reliability and processability of the product, and increasing the production and use costs.

[0003] In summary, the surface precipitation of the co-crosslinking agent easily leads to abnormal crosslinking degree of POE, abnormal slippage between the film and glass and solar cells, etc. Therefore, improving the compatibility between the co-crosslinking agent and POE is an urgent problem to be solved. In the prior art, in order to reduce the degree of additive precipitation and its influence, some researchers have tried to reduce the friction coefficient reduction caused by additive precipitation through the pattern design of the film, but this method cannot fundamentally solve the problem of additive precipitation. Summary of the Invention

[0004] The main object of the present invention is to provide a crosslinked encapsulation film composition, a crosslinked encapsulation film, a preparation method thereof, and a photovoltaic module, so as to solve the problems in the prior art that the surface precipitation of the co-crosslinking agent easily leads to abnormal crosslinking degree of POE, abnormal slippage between the film and glass and solar cells, etc.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a crosslinked encapsulation film composition. Calculated by weight, the crosslinked encapsulation film composition includes 100 parts of a matrix resin, 0.05-5 parts of an additive, and 0.3-5 parts of a co-crosslinking agent; wherein, the co-crosslinking agent includes co-crosslinking agent S, and co-crosslinking agent S is an oligomer or polymer formed by co-crosslinking agent monomers, wherein the co-crosslinking agent monomers include triallyl isocyanurate monomer and / or triallyl cyanurate monomer.

[0006] Further, the structural formula of the above co-crosslinking agent S is: and / or wherein, A is and / or wherein the "*" is the connection position of A and R; R is -S- or -NH-, m is any integer from 1 to 10; n is any integer from 2 to 250; when the co-crosslinking agent S is and P-TAIC, the mass ratio of the two is preferably 30-60:70-40.

[0007] Further, the above co-crosslinking agent further includes 0.1-2 parts of co-crosslinking agent A, and the co-crosslinking agent A is selected from any one or more of triallyl isocyanurate, trimellitic acid triallyl ester, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, pentaerythritol tetramethacrylate.

[0008] Further, the mass ratio of the above co-crosslinking agent S to the co-crosslinking agent A is 30-90:70-10.

[0009] Further, the above matrix resin is a polyolefin resin, preferably the polyolefin resin is selected from any one or more of polyethylene, polypropylene, ethylene-octene copolymer, ethylene-butene copolymer; and / or under the test conditions of 190 °C and 2.16 kg, the melt index of the polyolefin resin is 1.0-30 g / 10 min, and preferably the light transmittance of the polyolefin resin ≥ 88%.

[0010] Further, the above additives include 0.1-2 parts of crosslinking agent and / or 0.1-5 parts of silane coupling agent; preferably the crosslinking agent is selected from any one or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1,1-(bis(tert-butylperoxy))3,3,5-trimethylcyclohexane, tert-butyl peroxybenzoate, triphenylmethane-4,4',4''-triisocyanate, dicumyl peroxide, bis(2-tert-butylperoxyisopropyl)benzene, tert-butyl cumyl peroxide, tert-amyl peroxybenzoate, di-tert-amyl peroxide, tert-butyl peroxybenzoate, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxy-3,5,5-trimethylhexanoate, bis(4-chlorobenzoyl)peroxide, bis(2,4-dichlorobenzyl)peroxide, bis(4-methylbenzoyl)peroxide, n-butyl-4,4-bis(tert-butylperoxy)valerate, ethyl-3,3-bis(tert-butylperoxy)butyrate, tert-butylperoxy-2-ethylhexyl carbonate; preferably the silane coupling agent is selected from any one or more of vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, methacrylate silane, vinyltriisopropoxysilane.

[0011] Further, the above-mentioned auxiliary agents include 0.05 to 2 parts of antioxidant and / or 0.05 to 1 part of light stabilizer; preferably, the antioxidant is selected from any one or more of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid; preferably, the light stabilizer is selected from any one or more of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly[succinic acid 2,2,6,6-tetramethyl-4-piperidyl ethanol ester], 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, and 2,4-dihydroxybenzophenone.

[0012] According to another aspect of the present invention, there is provided a method for preparing a crosslinked encapsulation film, which includes mixing a film-forming composition and then forming a film to obtain a crosslinked encapsulation film. The film-forming composition is the aforementioned crosslinked encapsulation film composition, and preferably the temperature for film formation is 70 to 90 °C.

[0013] According to still another aspect of the present invention, there is provided a crosslinked encapsulation film, which is prepared by the aforementioned preparation method. Preferably, the thickness of the crosslinked encapsulation film is 0.01 to 1.0 mm.

[0014] According to still another aspect of the present invention, there is provided a photovoltaic module, which includes an encapsulation film, and the encapsulation film is the aforementioned crosslinked encapsulation film.

[0015] By applying the technical solution of the present invention, a crosslinking aid S is added to the crosslinked encapsulation film composition. The crosslinking aid S is an oligomer or polymer. Compared with the corresponding monomer auxiliary agents, the molecular weight of the crosslinking aid S is increased, thereby improving the compatibility of the crosslinking aid S with POE, and further weakening its ability to migrate to the film surface. At the same time, the crosslinking rate of the film system is accelerated. While ensuring the crosslinking rate of the film, the phenomena such as film slippage and uneven crosslinking degree caused by the migration of the crosslinking aid to the film surface are greatly reduced, solving the problem of easy precipitation of auxiliary agents in the encapsulation film in the prior art, further ensuring the overall performance of the encapsulation film, and improving the reliability of the photovoltaic module. Detailed Embodiments

[0016] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0017] As analyzed in the background art, the surface precipitation of the co-crosslinking agent in the prior art easily leads to abnormal problems such as abnormal crosslinking degree of POE, slippage between the adhesive film and glass and solar cells, etc. To solve this problem, the present invention provides a crosslinkable encapsulant film composition, a crosslinkable encapsulant film, a preparation method thereof, and a photovoltaic module.

[0018] In a typical embodiment of the present application, a crosslinkable encapsulant film composition is provided. In parts by weight, the crosslinkable encapsulant film composition includes: 100 parts of a matrix resin, 0.05 to 5 parts of an auxiliary agent, and 0.3 to 5 parts of a co-crosslinking agent; wherein, the co-crosslinking agent includes co-crosslinking agent S, and co-crosslinking agent S is an oligomer or polymer formed by co-crosslinking agent monomers, wherein the co-crosslinking agent monomers include triallyl isocyanurate monomers and / or triallyl cyanurate monomers.

[0019] Co-crosslinking agent S is added to the crosslinkable encapsulant film composition. The co-crosslinking agent S is an oligomer or polymer. Compared with the corresponding monomer auxiliary agent, the molecular weight of the co-crosslinking agent S is increased, so as to improve the compatibility of the co-crosslinking agent S with POE, and further weaken its ability to migrate to the surface of the adhesive film. At the same time, the crosslinking rate of the adhesive film system is accelerated, and while ensuring the crosslinking rate of the adhesive film, the phenomena such as slippage of the adhesive film and uneven crosslinking degree caused by the migration of the co-crosslinking agent to the surface of the adhesive film are greatly reduced, solving the problem of easy precipitation of auxiliary agents in the encapsulant film in the prior art, further ensuring the overall performance of the encapsulant film, and improving the reliability of the photovoltaic module.

[0020] In addition, the co-crosslinking agent S can be 0.05 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 2.0 parts, 5.0 parts or any value therebetween.

[0021] In an embodiment of the present application, the above structural formula is: and / or wherein, A is and / or wherein the "*" is the connection position of A and R; R is -S- or -NH-, m is any integer from 1 to 10; n is any integer from 2 to 250; when the co-crosslinking agent S is and P-TAIC, the mass ratio of the two is preferably 30 to 60:70 to 40.

[0022] Preferably, R in the oligomer formed by the triallyl isocyanurate monomer is selected from the above types. Controlling m and n in the product formed by the reaction of the co-crosslinking agent monomer within the above ranges helps to improve the compatibility and crosslinking rate of the co-crosslinking agent S and the polyolefin. When the co-crosslinking agent S includes an oligomer or polymer formed by the triallyl isocyanurate monomer and an oligomer formed by the triallyl cyanurate monomer, it is preferred to control the mass ratio of the two within the above range, which helps to exert the synergistic cooperation between the two, thereby facilitating further improvement of the compatibility and crosslinking rate of the co-crosslinking agent S and POE, and solving the problem of easy precipitation of additives in the encapsulation film in the prior art.

[0023] In one embodiment of the present application, the above co-crosslinking agent further includes 0.1-2 parts of co-crosslinking agent A, and the co-crosslinking agent A is selected from any one or more of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, and pentaerythritol tetramethacrylate.

[0024] Adding co-crosslinking agent A helps to accelerate the dispersion of co-crosslinking agent S in the system and improve the crosslinking rate. Preferably, the above types of co-crosslinking agent A help to enrich the selectivity of crosslinking agent A and improve the synergistic effect between co-crosslinking agent A and co-crosslinking agent S.

[0025] In order to further improve the synergistic cooperation between co-crosslinking agent S and co-crosslinking agent A, in one embodiment of the present application, it is preferred that the mass ratio of the above co-crosslinking agent S to co-crosslinking agent A is 30-90:70-10.

[0026] In one embodiment of the present application, the above matrix resin is a polyolefin resin. Preferably, the polyolefin resin is selected from any one or more of polyethylene, polypropylene, ethylene-octene copolymer, and ethylene-butene copolymer; and / or under the test conditions of 190°C and 2.16 kg, the melt index of the polyolefin resin is 1.0-30 g / 10 min. Preferably, the light transmittance of the polyolefin resin is ≥88%.

[0027] Preferably, the polyolefin resin is selected from the above types, and preferably controlling the melt index and light transmittance within the above ranges helps to improve the mechanical properties, transparency, sunlight utilization rate, and encapsulation performance of the crosslinked encapsulation film.

[0028] In one embodiment of the present application, the above-mentioned auxiliary agents include 0.1 to 2 parts of a cross-linking agent and / or 0.1 to 5 parts of a silane coupling agent; preferably, the cross-linking agent is selected from any one or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1,1-(bis(tert-butylperoxy))-3,3,5-trimethylcyclohexane, tert-butyl peroxybenzoate, triphenylmethane-4,4',4''-triisocyanate, dicumyl peroxide, bis(2-tert-butylperoxyisopropyl)benzene, tert-butylcumyl peroxide, tert-amyl peroxybenzoate, di-tert-amyl peroxide, tert-butyl peroxybenzoate, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxy-3,5,5-trimethylhexanoate, bis(4-chlorobenzoyloxy)peroxide, bis(2,4-dichlorobenzyl)peroxide, bis(4-methylbenzoyloxy)peroxide, n-butyl-4,4-bis(tert-butylperoxy)valerate, ethyl-3,3-bis(tert-butylperoxy)butyrate, tert-butylperoxy-2-ethylhexyl carbonate; preferably, the silane coupling agent is selected from any one or more of vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, methacrylate silane, vinyltriisopropoxysilane.

[0029] Adding a cross-linking agent helps to improve the cross-linking rate of the cross-linked encapsulation film; adding a silane coupling agent helps to improve the interfacial interaction between the co-cross-linking agent and the matrix resin, thereby improving the mechanical properties of the cross-linked encapsulation film; preferably, the cross-linking agent and the silane coupling agent are selected from the above types, which helps to further improve the synergistic cooperation between the cross-linking agent and the silane coupling agent.

[0030] In one embodiment of the present application, the above-mentioned auxiliary agents include 0.05 to 2 parts of an antioxidant and / or 0.05 to 1 part of a light stabilizer; preferably, the antioxidant is selected from any one or more of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid; preferably, the light stabilizer is selected from any one or more of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, polybutanedioic acid (4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) ester, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2,4-dihydroxybenzophenone.

[0031] Preferably, the above-mentioned additives include antioxidants and light stabilizers, and controlling the types of both within the above ranges helps to improve the aging resistance of the cross-linked encapsulation film.

[0032] In another typical embodiment of the present application, a method for preparing a cross-linked encapsulation film is provided, which includes mixing the film composition and then forming a film to obtain the cross-linked encapsulation film. The film composition is the aforementioned cross-linked encapsulation film composition, and preferably the film-forming temperature is 70-90°C.

[0033] By fully mixing the components in the film composition, a cross-linked encapsulation film is obtained. Preferably, controlling the film-forming temperature within the above range helps to improve the fluidity of the components in the film composition, thereby helping to improve the overall uniformity of the cross-linked encapsulation film, and the above preparation method is simple and has a low cost.

[0034] In addition, the co-crosslinking agent S is obtained by a polymerization reaction, and its typical reaction chemical formula is as follows:

[0035] In a preferred embodiment, the co-crosslinking agent S is prepared by the following method: By weight, 5-30 parts of a co-crosslinking agent monomer (triallyl isocyanurate monomer and / or triallyl cyanurate monomer), 0.5 times the molar amount of the monomer of a bridging agent (such as 1,4-butanedithiol or 1,4-butanediamine), and 0.05-1.0 part of an initiator azobisisobutyronitrile are added to 100 parts of a solvent and mixed and dissolved in the corresponding solvent. After reacting at 40-70°C for 2-10 hours, the corresponding solvent is removed to prepare the corresponding co-crosslinking agent S.

[0036] The polymerization reaction equation of triallyl cyanurate monomer and a bridging agent (1,4-butanediamine corresponds to m = 2 in the following equation) is as follows:

[0037]

[0038] The polymerization reaction equation of triallyl isocyanurate monomer and a bridging agent (1,4-butanedithiol corresponds to m = 2 in the following equation) is as follows:

[0039]

[0040] In a preferred embodiment, the co-crosslinking agent S (P-TAIC) is prepared by the following method: By weight, 2 to 20 parts of triallyl isocyanurate monomer and 0.05 to 1.0 part of an initiator (such as azobisisobutyronitrile or benzoyl peroxide) are added to 100 parts of a solvent and mixed evenly. After reacting at 50 to 70 °C for 4 to 48 hours, it is precipitated with cold methanol, and the residual solvent is removed to prepare the corresponding co-crosslinking agent S. The solvent is selected from tetrahydrofuran, ethyl acetate, acetone, toluene, methyl ethyl ketone, dichloroethane, etc.

[0041]

[0042] In another typical embodiment of the present application, a crosslinked encapsulation film is provided. The crosslinked encapsulation film is prepared by the aforementioned preparation method. Preferably, the thickness of the crosslinked encapsulation film is 0.01 to 1.0 mm.

[0043] The crosslinked encapsulation film prepared by the above method helps to reduce the ability of the crosslinked encapsulation film to migrate to the film surface; preferably controlling the thickness of the crosslinked encapsulation film within the above range helps to improve the compatibility of the crosslinked encapsulation film in photovoltaic modules. The crosslinked encapsulation film including the co-crosslinking agent S is beneficial to greatly reduce phenomena such as film slippage and uneven crosslinking degree caused by the migration of the co-crosslinking agent to the film surface, solve the problem of easy precipitation of additives in the existing encapsulation film, and further ensure the overall performance of the encapsulation film.

[0044] In another typical embodiment of the present application, a photovoltaic module is provided, including an encapsulation film, and the encapsulation film is the aforementioned crosslinked encapsulation film.

[0045] Since the above photovoltaic module contains the crosslinked encapsulation film of the present application, it is beneficial to increase the friction force between the crosslinked encapsulation film and the battery chip and the glass, thereby improving the production efficiency and reliability of the photovoltaic module.

[0046] Hereinafter, the beneficial effects of the present application will be described in conjunction with specific examples and comparative examples.

[0047] Example 1

[0048] By weight, 100 parts of ethylene-octene copolymer resin (Dow Chemical), with a melt index of 16.0 g / 10 min. 1.0 part of 1,1-(di-tert-butylperoxy) 3,3,5-trimethylcyclohexane, 0 part of oligomer A, 1.0 part of bis(triallyl cyanurate), 2.0 parts of vinyltrimethoxysilane, 0.1 part of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.1 part of triallyl isocyanurate.

[0049] Preparation method: After mixing the above-mentioned composition evenly, it is put into an extruder. Through processes such as melt extrusion, casting into a film, cooling, and winding, the corresponding cross-linked encapsulation film is prepared. Among them, the temperature for film formation is 70 °C, and the thickness of the prepared cross-linked encapsulation film is 0.1 mm. When laminating the components, tempered glass, encapsulation film, crystalline silicon cell, encapsulation film, and backsheet are placed in order from top to bottom and laminated at 150 °C for 20 minutes to obtain the corresponding photovoltaic module. For double-glass modules, the backsheet is replaced with float glass, and other conditions are the same.

[0050] Example 2

[0051] The difference from Example 1 is that 3 parts of diallyl cyanurate and 2 parts of triallyl isocyanurate are used to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0052] Example 3

[0053] The difference from Example 1 is that 0.3 part of diallyl cyanurate and 0.2 part of triallyl isocyanurate are used to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0054] Example 4

[0055] The difference from Example 1 is that 0.3 part of oligomer A and 0.7 part of diallyl cyanurate are used, and the mass ratio of oligomer A to diallyl cyanurate is 3:7, to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0056] Example 5

[0057] The difference from Example 1 is that 0.5 part of oligomer A and 0.5 part of diallyl cyanurate are used, and the mass ratio of oligomer A to diallyl cyanurate is 1:1, to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0058] Example 6

[0059] The difference from Example 1 is that 0.6 part of oligomer A and 0.4 part of diallyl cyanurate are used, and the mass ratio of oligomer A to diallyl cyanurate is 6:4, to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0060] Example 7

[0061] The difference from Example 1 is that 0.7 part of oligomer A and 0.3 part of diallyl cyanurate are used, and the mass ratio of oligomer A to diallyl cyanurate is 7:3, to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0062] Example 8

[0063] The difference from Example 4 is that oligomer B is used instead of oligomer A to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0064] Example 9

[0065] The difference from Example 1 is that 0.3 parts of diallyl cyanurate, 0.7 parts of triallyl isocyanurate are used, and the mass ratio of the co-crosslinking agent S to triallyl isocyanurate is 3:7 to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0066] Example 10

[0067] The difference from Example 1 is that 0.5 parts of diallyl cyanurate, 0.5 parts of triallyl isocyanurate are used, and the mass ratio of the co-crosslinking agent S to triallyl isocyanurate is 1:1 to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0068] Example 11

[0069] The difference from Example 1 is that 0.9 parts of diallyl cyanurate, 0.1 parts of triallyl isocyanurate are used, and the mass ratio of the co-crosslinking agent S to triallyl isocyanurate is 9:1 to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0070] Example 12

[0071] The difference from Example 1 is that 0.95 parts of diallyl cyanurate, 0.05 parts of triallyl isocyanurate are used, and the mass ratio of the co-crosslinking agent S to triallyl isocyanurate is 9.5:0.5 to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0072] Example 13

[0073] The difference from Example 1 is that polyethylene is used instead of ethylene-octene copolymer resin with a melt index of 2.0 g / 10 min to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0074] Example 14

[0075] The difference from Example 1 is that the film-forming temperature is 90 °C to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0076] Example 15

[0077] The difference from Example 1 is that the thickness of the crosslinked encapsulation film is 1.0 mm to obtain a crosslinked encapsulation film, and finally a photovoltaic module is obtained.

[0078] Example 16

[0079] The difference from Example 1 is that polymer C replaces triallyl cyanurate to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0080] Comparative Example 1

[0081] The difference from Example 3 is that triallyl isocyanurate monomer replaces triallyl cyanurate to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0082] Comparative Example 2

[0083] The difference from Example 3 is that triallyl cyanurate monomer replaces triallyl cyanurate, and triallyl cyanurate monomer replaces triallyl isocyanurate monomer to obtain a cross-linked encapsulation film, and finally a photovoltaic module is obtained.

[0084] Test method:

[0085] 1. Surface roughness: The test method refers to the standard GB / T 1031-2009 "Geometrical Product Specifications (GPS) - Surface texture: Profile method - Surface roughness parameters and their values". Before the test, the samples are stored at 0 °C and a relative humidity of <60% for 1000 hours, and then warmed to room temperature for 24 hours before testing.

[0086] 2. Crosslinking degree: Refer to the standard GB / T 29848 "Ethylene-vinyl acetate copolymer film for photovoltaic encapsulation".

[0087] 3. Light transmittance: Refer to the standard GB / T 29848 "Ethylene-vinyl acetate copolymer film for photovoltaic encapsulation".

[0088] The cross-linked encapsulation films of the above examples and comparative examples were tested for properties such as surface roughness, crosslinking degree, and light transmittance, and the test results are listed in Table 1.

[0089] Table 1

[0090]

[0091] Among them, oligomer A is: m = 10;

[0092] Oligomer B is: m = 1;

[0093] Polymer C: M w = 20000 g / mol, PDI = 1.4.

[0094] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0095] A co-crosslinking agent S is added to the crosslinkable encapsulant film composition. The co-crosslinking agent S is an oligomer or polymer. Compared with the corresponding monomeric auxiliary agent, the molecular weight of the co-crosslinking agent S is increased, thereby improving the compatibility of the co-crosslinking agent S with POE, and further weakening its ability to migrate to the film surface. At the same time, the crosslinking rate of the film system is accelerated. While ensuring the crosslinking rate of the film, the phenomena such as film slippage and uneven crosslinking degree caused by the migration of the co-crosslinking agent to the film surface are greatly reduced, solving the problem of easy precipitation of auxiliary agents in the encapsulant film in the prior art, further ensuring the overall performance of the encapsulant film, and improving the reliability of the photovoltaic module.

[0096] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A crosslinked encapsulant film composition, characterized in that, In parts by weight, the crosslinkable encapsulating adhesive film composition comprises: 100 parts of a matrix resin; 0.05 to 5 parts of an auxiliary agent; 0.3 to 5 parts of a co-crosslinking agent; Wherein, the co-crosslinking agent comprises a co-crosslinking agent S, and the co-crosslinking agent S is an oligomer or polymer formed by a co-crosslinking agent monomer. Among them, the co-crosslinking agent monomer comprises triallyl isocyanurate monomer and / or triallyl cyanurate monomer.

2. The crosslinked encapsulant film composition according to claim 1, wherein The structural formula of the co-crosslinking agent S is as follows: and / or (P-TAIC), where A is and / or where "*" is the connection position of A and R; R is -S- or -NH-, m is any integer from 1 to 10; n is any integer from 2 to 250; when the co-crosslinking agent S is and P-TAIC, the mass ratio of the two is preferably 30-60:70-40.

3. The crosslinkable encapsulant film composition according to claim 1 or 2, characterized in that, The co-crosslinking agent further comprises 0.1 to 2 parts of a co-crosslinking agent A, and the co-crosslinking agent A is selected from any one or more of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, pentaerythritol tetramethacrylate.

4. The crosslinkable encapsulant film composition according to claim 3, wherein The mass ratio of the co-crosslinking agent S to the co-crosslinking agent A is 30 to 90:70 to 10.

5. The crosslinkable encapsulant film composition according to any one of claims 1 to 4, characterized in that, The matrix resin is a polyolefin resin. Preferably, the polyolefin resin is selected from any one or more of polyethylene, polypropylene, ethylene-octene copolymer, ethylene-butene copolymer; and / or under the test conditions of 190 °C and 2.16 kg, the melt index of the polyolefin resin is 1.0 to 30 g / 10 min. Preferably, the light transmittance of the polyolefin resin is ≥88%.

6. The crosslinkable encapsulant film composition according to any one of claims 1 to 5, characterized in that, The auxiliary agent comprises 0.1 to 2 parts of a crosslinking agent and / or 0.1 to 5 parts of a silane coupling agent; Preferably, the crosslinking agent is selected from any one or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1,1-(bis(tert-butylperoxy))3,3,5-trimethylcyclohexane, tert-butyl peroxybenzoate, triphenylmethane-4,4’,4”-triisocyanate, dicumyl peroxide, bis(2-tert-butylperoxyisopropyl)benzene, tert-butylcumyl peroxide, tert-amyl peroxybenzoate, di-tert-amyl peroxide, tert-butyl peroxybenzoate, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxy-3,5,5-trimethylhexanoate, bis(4-chlorobenzoyl)peroxide, bis(2,4-dichlorobenzyl)peroxide, bis(4-methylbenzoyl)peroxide, n-butyl-4,4-bis(tert-butylperoxy)valerate, ethyl-3,3-bis(tert-butylperoxy)butyrate, tert-butylperoxy-2-ethylhexyl carbonate; Preferably, the silane coupling agent is selected from any one or more of vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, methacrylate silane, vinyltriisopropoxysilane; 7. The crosslinkable encapsulation adhesive film composition according to any one of claims 1 to 6, characterized in that The auxiliary agent comprises 0.05 to 2 parts of an antioxidant and / or 0.05 to 1 part of a light stabilizer; Preferably, the antioxidant is selected from any one or more of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid; Preferably, the light stabilizer is selected from any one or more of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly[succinic acid-(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol)] ester, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, and 2,4-dihydroxybenzophenone.

8. A method for preparing a crosslinked encapsulation film, comprising mixing a film composition and then forming a film to obtain the crosslinked encapsulation film, characterized in that, The adhesive film composition is the crosslinked encapsulation adhesive film composition according to any one of claims 1 to 7, and preferably the film-forming temperature is 70 to 90 °C.

9. A crosslinked encapsulation adhesive film, characterized in that, The crosslinked encapsulation adhesive film is prepared by the preparation method according to claim 8, and preferably the thickness of the crosslinked encapsulation adhesive film is 0.01 to 1.0 mm.

10. A photovoltaic module, comprising an encapsulant film, characterized in that, The encapsulation adhesive film is the crosslinked encapsulation adhesive film according to claim 9.

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