EPE adhesive film, preparation method thereof and photovoltaic module

Abstract

The invention relates to the technical field of photovoltaics, in particular to an EPE adhesive film, a preparation method thereof and a photovoltaic module. The EPE adhesive film comprises a first EVA layer, a POE layer and a second EVA layer which are arranged in sequence, the first EVA layer and the second EVA layer comprise EVA resin, a cross-linking agent, an assistant cross-linking agent, an antioxidant, a light stabilizer, a silane coupling agent and a surfactant; the POE layer comprises POE resin, a cross-linking agent, an assistant cross-linking agent, an antioxidant, a light stabilizer and a silane coupling agent; the surfactant comprises at least one of an alkyl glycoside surfactant, an alkyl betaine surfactant and an alkyl sodium sulfonate surfactant; the carbon atom number of alkyl in the surfactant is 6-24. In the adhesive film, the EVA layer and the POE layer have excellent bonding performance, under the condition that the POE thickness is low, a corresponding assembly can meet reliability testing, the cost of the adhesive film is reduced, and the bonding performance of the adhesive film is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to an EPE adhesive film, a preparation method thereof, and a photovoltaic module. Background Art

[0002] EPE photovoltaic film is widely used in the encapsulation of photovoltaic modules because it combines the advantages of EVA and POE. In order to respond to the cost reduction requirements of module manufacturers for photovoltaic film, the thickness of the POE layer in the EPE photovoltaic film products on the market has gradually decreased. As the thickness of the POE layer in the photovoltaic film decreases, the corresponding components are prone to delamination between the EVA layer and the POE layer during reliability testing, which affects the service life of the photovoltaic module.

[0003] In order to improve the current delamination problem, silane coupling agents are added to both the EVA layer and the POE layer in the existing EPE photovoltaic film, and the interaction between the silane coupling agents is used to improve the bonding performance of the EVA layer and the POE layer. However, due to the large difference in the polarity of the resins of the EVA layer and the POE layer in the EPE film, it is difficult for the silane coupling agents in the two layers to interact at the interface, resulting in poor bonding performance.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] An object of the present invention is to provide an EPE adhesive film having excellent bonding performance between an EVA layer and a POE layer.

[0006] Another object of the present invention is to provide a method for preparing the EPE film.

[0007] Another object of the present invention is to provide a photovoltaic module, comprising the above-mentioned EPE film.

[0008] In order to achieve the above-mentioned object of the present invention, the present invention provides an EPE film on one hand, comprising a first EVA layer, a POE layer and a second EVA layer arranged in sequence;

[0009] The first EVA layer and the second EVA layer each independently include the following components in parts by weight: 100 parts of EVA resin, 0.5-1.5 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer, 0.3-1.5 parts of silane coupling agent and 0.005-1 parts of surfactant;

[0010] The POE layer comprises the following components by weight: 100 parts of POE resin, 0.5-1.5 parts of cross-linking agent, 0.1-1 parts of auxiliary cross-linking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of silane coupling agent;

[0011] The surfactant comprises at least one of an alkyl glycoside surfactant, an alkyl betaine surfactant and an alkyl sodium sulfonate surfactant; the carbon number of the alkyl group in the surfactant is 6-24.

[0012] In a specific embodiment of the present invention, the alkyl glycoside surfactant is an alkyl glycoside with a carbon chain length of C6 to C18. Further, the alkyl glycoside includes at least one of hexyl glucoside, decyl glucoside, dodecyl glucoside and octadecyl glucoside.

[0013] In a specific embodiment of the present invention, the alkyl betaine surfactant has the following general structural formula:

[0014]

[0015] Among them, R 1 is a straight-chain alkyl group having 6 to 22 carbon atoms, R 2 It is an alkylene group having 1 to 5 carbon atoms. Further, the alkyl betaine surfactant includes hexyl dimethyl betaine, dodecyl dimethyl betaine, tetradecyl dimethyl betaine, hexadecyl dimethyl betaine, octadecyl dimethyl betaine and behenyl dimethyl betaine.

[0016] In a specific embodiment of the present invention, the alkyl sodium sulfonate surfactant is an alkyl sodium sulfonate with a carbon chain length of C6 to C24. Further, the alkyl sodium sulfonate surfactant includes at least one of hexyl sodium sulfonate, dodecyl sodium sulfonate, tetradecyl sodium sulfonate, hexadecyl sodium sulfonate and tetracosyl sodium sulfonate.

[0017] In a specific embodiment of the present invention, in the first EVA layer and the second EVA layer, the mass ratio of the silane coupling agent to the surfactant is 1:(0.05-0.6).

[0018] In a specific embodiment of the present invention, the ratio of the thickness of the first EVA layer, the POE layer and the second EVA layer is (1-2) : 1 : (1-2). Further, the thickness of the first EVA layer and the second EVA layer is 250-380 μm; the thickness of the POE layer is 80-140 μm.

[0019] In a specific embodiment of the present invention, the silane coupling agent includes at least one of γ-glycidyloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, triacetoxyvinylsilane, vinyltri(2-methoxyethoxy)silane and γ-(methacryloyloxy)propyltrimethoxysilane.

[0020] Another aspect of the present invention provides a method for preparing any one of the above-mentioned EPE films, comprising the following steps: co-extrusion casting is performed according to the composition ingredients of the first EVA layer, the POE layer and the second EVA layer to obtain the EPE packaging film.

[0021] Another aspect of the present invention provides a photovoltaic module, comprising any one of the above-mentioned EPE films.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) In the EPE adhesive film of the present invention, a surfactant having a long-chain hydrophobic and hydrophilic structure is added to the EVA layer, and the hydrophilic structure can promote the migration of the silane coupling agent in the EVA layer to the surface of the EVA layer connected to the POE layer, and the migration of the long-chain hydrophobic structure to the POE layer promotes the migration of the silane coupling agent in the POE layer to the surface of the POE layer, and the silane coupling agent in the EVA layer and the POE layer interact at the interface, thereby improving the bonding performance between the layers;

[0024] (2) In the EPE film of the present invention, the EVA layer and the POE layer have excellent bonding properties. When a low POE thickness is used, the corresponding components can meet the reliability test, while reducing the cost of the film and ensuring the bonding performance of the film;

[0025] (3) The photovoltaic module using the EPE film of the present invention will not delaminate after the PID-192h test, and the module power attenuation is less than 2%. DETAILED DESCRIPTION

[0026] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In one aspect, the present invention provides an EPE film, comprising a first EVA layer, a POE layer and a second EVA layer arranged in sequence;

[0029] The first EVA layer and the second EVA layer each independently include the following components in parts by weight: 100 parts of EVA resin, 0.5-1.5 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer, 0.3-1.5 parts of silane coupling agent and 0.005-1 parts of surfactant;

[0030] The POE layer includes the following components by weight: 100 parts of POE resin, 0.5-1.5 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of silane coupling agent;

[0031] The surfactant comprises at least one of an alkyl glycoside surfactant, an alkyl betaine surfactant and an alkyl sodium sulfonate surfactant; the carbon number of the alkyl group in the surfactant is 6-24.

[0032] In the EPE adhesive film of the present invention, a surfactant having a long-chain hydrophobic and hydrophilic structure is added to the EVA layer, the hydrophilic structure can promote the silane coupling agent in the EVA layer to migrate to the surface of the EVA layer connected to the POE layer, the long-chain hydrophobic structure migrates to the POE layer to promote the silane coupling agent in the POE layer to migrate to the surface of the POE layer, the silane coupling agent in the EVA layer and the POE layer interact with each other at the interface, and the bonding performance between the layers is improved. Among them, when the number of carbon atoms in the alkyl group of the surfactant is too small, the difference in hydrophilicity and hydrophobicity of the surfactant is reduced, weakening its ability to promote the migration of the silane coupling agent of the POE layer to the surface of the POE layer, and the improvement of the interfacial interaction between the EVA layer and the POE layer is weak; when the number of carbon atoms in the alkyl group of the surfactant is too large, although the difference in hydrophilicity and hydrophobicity of the surfactant increases, the interaction force of the long-chain molecular structure of the surfactant itself limits its migration and diffusion to the POE layer, and also weakens its ability to promote the migration of the silane coupling agent of the POE layer to the surface of the POE layer, and cannot effectively improve the bonding performance of the EVA layer and the POE layer.

[0033] For example, in different embodiments, the number of carbon atoms in the alkyl group in the surfactant of the present invention can be 6, 8, 10, 12, 15, 18, 20, 24 or a range consisting of any two of them.

[0034] For example, in different embodiments, in the first EVA layer and the second EVA layer, by weight, compared to 100 parts of EVA resin, the amounts of the remaining components may be as follows:

[0035] The amount of the cross-linking agent can be 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts or a range consisting of any two of them;

[0036] The amount of the auxiliary cross-linking agent can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof;

[0037] The amount of the antioxidant can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part or a range consisting of any two of them;

[0038] The amount of the light stabilizer can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof;

[0039] The amount of the silane coupling agent can be 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts or a range consisting of any two of them;

[0040] The amount of the surfactant can be 0.005 part, 0.05 part, 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two of them.

[0041] It is understood that the composition of the first EVA layer and the second EVA layer can be the same or different, and each composition is kept within the scope of the present invention. In order to ensure the cheapness of production and the stability of the film, the composition of the first EVA layer and the second EVA layer is the same. In addition, the EVA resin and POE resin used in the present invention are the EVA resin and POE resin used in conventional EPE films, which will not be described in detail.

[0042] For example, in different embodiments, in the POE layer, by weight, compared to 100 parts of POE resin, the amounts of the remaining components may be as follows:

[0043] The amount of the cross-linking agent can be 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts or a range consisting of any two of them;

[0044] The amount of the auxiliary cross-linking agent can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof;

[0045] The amount of the antioxidant can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part or a range consisting of any two of them;

[0046] The amount of the light stabilizer can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof;

[0047] The amount of the silane coupling agent can be 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts or a range consisting of any two of them.

[0048] In a specific embodiment of the present invention, the alkyl glycoside surfactant is an alkyl glycoside with a carbon chain length of C6 to C18. Further, the alkyl glycoside includes at least one of hexyl glucoside, decyl glucoside, dodecyl glucoside and octadecyl glucoside.

[0049] For example, in different embodiments, the carbon chain length of the alkyl glycoside surfactant of the present invention can be C6, C9, C10, C12, C15, C18 or a range consisting of any two of them, for example, preferably C6 to C12 alkyl glycoside.

[0050] In a specific embodiment of the present invention, the alkyl betaine surfactant has the following general structural formula:

[0051]

[0052] Among them, R 1 is a straight-chain alkyl group having 6 to 22 carbon atoms, R 2 It is an alkylene group having 1 to 5 carbon atoms. Further, the alkyl betaine surfactant includes hexyl dimethyl betaine, dodecyl dimethyl betaine, tetradecyl dimethyl betaine, hexadecyl dimethyl betaine, octadecyl dimethyl betaine and behenyl dimethyl betaine.

[0053] For example, in different embodiments, in the alkyl betaine surfactant of the present invention, R 1 It can be a straight chain alkyl group having 6, 8, 10, 12, 16, 18, 20, 22 carbon atoms or any two thereof, for example, R 1 Preferably, it is a straight-chain alkyl group having 6 to 16 carbon atoms, and more preferably a straight-chain alkyl group having 12 to 16 carbon atoms; R 2 It can be an alkylene group having 1, 2, 3, 4 or 5 carbon atoms, such as methylene.

[0054] In a specific embodiment of the present invention, the alkyl sodium sulfonate surfactant is an alkyl sodium sulfonate with a carbon chain length of C6 to C24. Further, the alkyl sodium sulfonate surfactant includes at least one of hexyl sodium sulfonate, dodecyl sodium sulfonate, tetradecyl sodium sulfonate, hexadecyl sodium sulfonate and tetracosyl sodium sulfonate.

[0055] For example, in different embodiments, the carbon chain length of the sodium alkyl sulfonate surfactant of the present invention can be C6, C10, C12, C15, C18, C20, C24 or a range consisting of any two of them, for example, the carbon chain length is preferably C12 to C16.

[0056] It is understood that the surfactants in the present invention can be self-made or conventional commercial products. For example, the alkyl betaine surfactant can be R 1 N(CH 3 ) 2 It is prepared by reaction with chloroacetic acid; the sodium alkyl sulfonate surfactant can be prepared by reaction of brominated or chloroalkyl with sodium sulfite.

[0057] In a specific embodiment of the present invention, in the first EVA layer and the second EVA layer, the mass ratio of the silane coupling agent to the surfactant is 1:(0.05-0.6).

[0058] The ratio of silane coupling agent to surfactant is within a certain range, which can take into account the promoting effect of surfactant on the bonding of two layers of silane coupling agent and avoid causing changes in the internal structural properties of the film. For example, in different embodiments, in the first EVA layer and the second EVA layer, the mass ratio of silane coupling agent to surfactant can be 1:0.05, 1:0.08, 1:0.1, 1:0.15, 1:0.2, 1:0.25, 1:0.3, 1:0.35, 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6 or a range consisting of any two of them.

[0059] In a specific embodiment of the present invention, the thickness ratio of the first EVA layer, the POE layer and the second EVA layer is (1-2) : 1 : (1-2). Further, the thickness of the first EVA layer and the second EVA layer is 250-380 μm; the thickness of the POE layer is 80-140 μm.

[0060] For example, in different embodiments, the ratio of the thickness of the first EVA layer and the second EVA layer to the POE layer can be 1:1, 1.2:1, 1.5:1, 1.8:1, 2:1 or a range consisting of any two thereof. Specifically, the thickness of the first EVA layer and the second EVA layer can be 250μm, 260μm, 280μm, 300μm, 320μm, 350μm, 380μm or a range consisting of any two thereof, and the thickness of the POE layer can be 80μm, 90μm, 100μm, 120μm, 140μm or a range consisting of any two thereof. The EPE adhesive film of the present invention improves the bonding performance between the EVA layer and the POE layer, can meet the reliability test of the components corresponding to the low POE layer thickness, can reduce the cost of the adhesive film, and can ensure that it does not delaminate.

[0061] In a specific embodiment of the present invention, the crosslinking agent includes at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-butyl peroxy-3,5,5-trimethylhexanoate, dibenzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane and 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane.

[0062] In a specific embodiment of the present invention, the auxiliary cross-linking agent includes at least one of ethylene glycol dimethacrylate, triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane triacrylate, triallyl cyanurate and ethoxylated trimethylolpropane triacrylate.

[0063] In a specific embodiment of the present invention, the antioxidant includes at least one of tris(nonylphenyl) phosphite, 2,6-di-tert-butyl-p-cresol, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-thiobis(4-methyl-6-tert-butylphenol) and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0064] In a specific embodiment of the present invention, the light stabilizer includes at least one of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, light stabilizer 944, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate and 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester.

[0065] In a specific embodiment of the present invention, the silane coupling agent includes at least one of γ-glycidyloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, triacetoxyvinylsilane, vinyltri(2-methoxyethoxy)silane and γ-(methacryloyloxy)propyltrimethoxysilane.

[0066] Another aspect of the present invention provides a method for preparing any one of the above-mentioned EPE films, comprising the following steps: co-extrusion casting is performed according to the composition ingredients of the first EVA layer, the POE layer and the second EVA layer to obtain the EPE packaging film.

[0067] Another aspect of the present invention provides a photovoltaic module, comprising any one of the above-mentioned EPE films.

[0068] Some of the material information used in the following specific embodiments of the present invention may be as follows, but is not limited thereto:

[0069] EVA resin: Sailbon V2825;

[0070] POE resin: Dow PV8669.

[0071] Example 1

[0072] This embodiment provides an EPE film, comprising a first EVA layer, a POE layer and a second EVA layer arranged in sequence, wherein the thickness of the first EVA layer and the second EVA layer are both 125 μm, and the thickness of the POE layer is 140 μm.

[0073] The first EVA layer and the second EVA layer include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.5 parts of ethylene glycol dimethacrylate, 0.5 parts of tris(nonylphenyl) phosphite, 0.6 parts of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 0.2 parts of decyl glucoside.

[0074] The POE layer includes the following components in parts by weight: 100 parts of POE resin, 1 part of tert-butyl peroxy-3,5,5-trimethylhexanoate, 0.6 parts of trimethylolpropane triacrylate, 0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.6 parts of light stabilizer 944, and 1 part of vinyl triethoxysilane.

[0075] The preparation method of the EPE film of this embodiment includes the following steps: premixing the ingredients of the first EVA layer, the POE layer and the second EVA layer, passing through a cast extruder, plasticizing and extruding at 80° C., stretching, pulling and winding to obtain the EPE film.

[0076] Example 2

[0077] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the compositions of the first EVA layer and the second EVA layer are different.

[0078] The first EVA layer and the second EVA layer of the present embodiment include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxide-2-ethylhexyl carbonate, 0.5 part of ethylene glycol dimethacrylate, 0.5 part of tris(nonylphenyl) phosphite, 0.6 part of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1.5 parts of γ-glycidyloxypropyltrimethoxysilane and 1 part of decyl glucoside.

[0079] Example 3

[0080] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the compositions of the first EVA layer and the second EVA layer are different.

[0081] The first EVA layer and the second EVA layer of the present embodiment include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxide-2-ethylhexyl carbonate, 0.5 parts of ethylene glycol dimethacrylate, 0.5 parts of tris(nonylphenyl) phosphite, 0.6 parts of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 0.3 parts of γ-glycidyloxypropyltrimethoxysilane and 0.005 parts of decyl glucoside.

[0082] Example 4

[0083] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the compositions of the first EVA layer and the second EVA layer are different.

[0084] The first EVA layer and the second EVA layer of the present embodiment include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxide-2-ethylhexyl carbonate, 0.5 part of ethylene glycol dimethacrylate, 0.5 part of tris(nonylphenyl) phosphite, 0.6 part of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 0.05 part of decyl glucoside.

[0085] Example 5

[0086] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the compositions of the first EVA layer and the second EVA layer are different.

[0087] The first EVA layer and the second EVA layer of the present embodiment include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxide-2-ethylhexyl carbonate, 0.5 part of ethylene glycol dimethacrylate, 0.5 part of tris(nonylphenyl) phosphite, 0.6 part of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 0.6 part of decyl glucoside.

[0088] Example 6

[0089] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the compositions of the first EVA layer and the second EVA layer are different.

[0090] The first EVA layer and the second EVA layer of the present embodiment include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxide-2-ethylhexyl carbonate, 0.5 part of ethylene glycol dimethacrylate, 0.5 part of tris(nonylphenyl) phosphite, 0.6 part of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 1 part of decyl glucoside.

[0091] Example 7 Group

[0092] This group of embodiments refers to the EPE film and preparation method thereof of Example 1, the only difference being that the types of surfactants in the first EVA layer and the second EVA layer are different.

[0093] In Example 7a, an equal weight of hexyl glucoside was used to replace decyl glucoside;

[0094] In Example 7b, an equal weight of dodecyl glucoside was used to replace decyl glucoside;

[0095] In Example 7c, octadecyl glucoside was replaced with an equal weight of octadecyl glucoside;

[0096] In Example 7d, an equal weight of hexyl dimethyl betaine was used to replace decyl glucoside;

[0097] In Example 7e, an equal weight of dodecyl dimethyl betaine was used to replace decyl glucoside;

[0098] In Example 7f, an equal weight of hexadecyl dimethyl betaine was used to replace decyl glucoside;

[0099] In Example 7g, an equal weight of behenyl dimethyl betaine was used to replace decyl glucoside;

[0100] In Example 7h, an equal weight of sodium hexyl sulfonate was used to replace decyl glucoside;

[0101] In Example 7i, an equal weight of sodium dodecyl sulfate was used to replace decyl glucoside;

[0102] In Example 7j, an equal weight of sodium hexadecyl sulfonate was used to replace decyl glucoside;

[0103] In Example 7k, an equal weight of sodium lauryl sulfonate was used to replace decyl glucoside.

[0104] Among them, hexyl dimethyl betaine can be prepared by reacting N,N-dimethylhexylamine with chloroacetic acid, but is not limited to this; behenyl dimethyl betaine can be prepared by reacting dimethyl behenylamine with chloroacetic acid, but is not limited to this; sodium tetracosyl sulfonate can be prepared by reacting 1-bromotetracosane with sodium sulfite, but is not limited to this.

[0105] Example 8

[0106] This embodiment refers to the EPE adhesive film and preparation method thereof of Embodiment 1, the only difference being that the thicknesses of the first EVA layer, the POE layer and the second EVA layer are different.

[0107] In this embodiment, the thickness of the first EVA layer and the second EVA layer are both 190 μm, and the thickness of the POE layer is 80 μm.

[0108] Comparative Example 1

[0109] Comparative Example 1 refers to the EPE film and preparation method thereof of Example 1, except that the types of surfactants in the first EVA layer and the second EVA layer are different.

[0110] In Comparative Example 1, butyl glucoside was used in an equal weight amount to replace decyl glucoside.

[0111] Comparative Example 2

[0112] Comparative Example 2 refers to the EPE film and preparation method thereof of Example 1, except that the types of surfactants in the first EVA layer and the second EVA layer are different.

[0113] In Comparative Example 2, butyl dimethyl betaine was used in an equal weight amount to replace decyl glucoside.

[0114] Wherein, butyl dimethyl betaine can be prepared by reacting n-butyl dimethylamine with chloroacetic acid, but is not limited thereto.

[0115] Comparative Example 3

[0116] Comparative Example 3 refers to the EPE film and preparation method thereof of Example 1, except that the types of surfactants in the first EVA layer and the second EVA layer are different.

[0117] In Comparative Example 3, an equal weight of sodium butane sulfonate was used to replace decyl glucoside.

[0118] Comparative Example 4

[0119] Comparative Example 4 refers to the EPE film and preparation method thereof of Example 1, except that the compositions of the first EVA layer and the second EVA layer are different.

[0120] The first EVA layer and the second EVA layer of Comparative Example 4 include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.5 parts of ethylene glycol dimethacrylate, 0.5 parts of tris(nonylphenyl) phosphite, 0.6 parts of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 0.002 parts of decyl glucoside.

[0121] Comparative Example 5

[0122] Comparative Example 5 refers to the EPE film and preparation method thereof of Example 1, except that the compositions of the first EVA layer and the second EVA layer are different.

[0123] The first EVA layer and the second EVA layer of Comparative Example 5 include the following components in parts by weight: 100 parts of EVA resin, 1 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.5 parts of ethylene glycol dimethacrylate, 0.5 parts of tris(nonylphenyl) phosphite, 0.6 parts of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1 part of γ-glycidyloxypropyltrimethoxysilane and 1.2 parts of decyl glucoside.

[0124] Comparative Example 6

[0125] Comparative Example 6 refers to the EPE film and preparation method thereof of Example 1, except that the compositions of the first EVA layer and the second EVA layer are different.

[0126] In Comparative Example 6, no surfactant was added to the first EVA layer and the second EVA layer.

[0127] Experimental example

[0128] In order to compare and illustrate the performance differences of different EPE films, the EPE films prepared in different embodiments and comparative examples were subjected to the following tests. The test methods are as follows and the test results are shown in Table 1.

[0129] The EPE films of different embodiments and comparative examples were made into photovoltaic module samples to be tested, and the initial module power and the photovoltaic module power after PID-192h of different photovoltaic modules were tested with reference to IEC62804-1:2015, and the attenuation rate was calculated based on the two data; and the appearance changes of the photovoltaic modules after PID-192h were recorded. Among them, the preparation of photovoltaic modules includes: laminating and preparing double-glass modules in the order of upper glass, upper EPE film, battery cell, lower EPE film, and lower glass. Among them, the battery cell adopts 210R size TOPCon battery cell, and finally makes a 48-format module. The initial power of the conventional TOPCon module is 455W.

[0130] Table 1 Test results of different EPE films

[0131]

[0132]

[0133] From the above test results, it can be seen that the present invention reduces the cost of the film and ensures the bonding performance of the film by adding a surfactant with a long-chain hydrophobic and hydrophilic structure to the EVA layer; it can prevent the corresponding photovoltaic module from delamination in the PID-192h test and the module power attenuation is less than 2% under the condition of low POE layer thickness (≤140μm).

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. EPE film, characterized in that: It includes a first EVA layer, a POE layer and a second EVA layer which are arranged in sequence; The first EVA layer and the second EVA layer each independently include the following components in parts by weight: 100 parts of EVA resin, 0.5-1.5 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer, 0.3-1.5 parts of silane coupling agent and 0.005-1 parts of surfactant; The POE layer comprises the following components by weight: 100 parts of POE resin, 0.5-1.5 parts of cross-linking agent, 0.1-1 parts of auxiliary cross-linking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of silane coupling agent; The surfactant comprises at least one of an alkyl glycoside surfactant, an alkyl betaine surfactant and an alkyl sodium sulfonate surfactant; the carbon number of the alkyl group in the surfactant is 6-24.

2. The EPE film according to claim 1, characterized in that: The alkyl polyglycoside surfactant is an alkyl polyglycoside with a carbon chain length of C6 to C18; Preferably, the alkyl glucoside includes at least one of hexyl glucoside, decyl glucoside, dodecyl glucoside and octadecyl glucoside.

3. The EPE film according to claim 1, characterized in that: The alkyl betaine surfactant has the following general structural formula: Wherein, R1 is a straight-chain alkyl group having 6 to 22 carbon atoms, and R2 is an alkylene group having 1 to 5 carbon atoms; Preferably, the alkyl betaine surfactant includes hexyl dimethyl betaine, dodecyl dimethyl betaine, tetradecyl dimethyl betaine, hexadecyl dimethyl betaine, octadecyl dimethyl betaine and behenyl dimethyl betaine.

4. The EPE film according to claim 1, characterized in that: The sodium alkyl sulfonate surfactant is sodium alkyl sulfonate with a carbon chain length of C6 to C24; Preferably, the sodium alkyl sulfonate surfactant includes at least one of sodium hexyl sulfonate, sodium dodecyl sulfonate, sodium tetradecyl sulfonate, sodium hexadecyl sulfonate and sodium lauryl sulfonate.

5. The EPE film according to claim 1, characterized in that: In the first EVA layer and the second EVA layer, the mass ratio of the silane coupling agent to the surfactant is 1:(0.05-0.6).

6. The EPE film according to claim 1, characterized in that: The thickness ratio of the first EVA layer, the POE layer and the second EVA layer is (1-2) : 1 : (1-2).

7. The EPE film according to claim 1, characterized in that: The thickness of the first EVA layer and the second EVA layer is 250-380 μm; the thickness of the POE layer is 80-140 μm.

8. The EPE film according to claim 1, characterized in that: The silane coupling agent includes at least one of γ-glycidyloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, triacetoxyvinylsilane, vinyltri(2-methoxyethoxy)silane and γ-(methacryloyloxy)propyltrimethoxysilane.

9. A method for preparing an EPE film, characterized in that: The method comprises the following steps: co-extrusion casting is performed according to the composition ingredients of the first EVA layer, the POE layer and the second EVA layer of the EPE film according to any one of claims 1 to 8 to obtain the EPE film.

10. A photovoltaic module, characterized in that The invention comprises the EPE film as described in any one of claims 1 to 8.

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