EPE type three-layer co-extruded adhesive film, and preparation method and application thereof

Abstract

The present application relates to a kind of EPE type three-layer co-extruded adhesive film and its preparation method and application, the EPE type three-layer co-extruded adhesive film includes first transparent EVA outer layer, transparent POE middle layer and second transparent EVA outer layer from top to bottom sequentially;The preparation raw material of first transparent EVA outer layer and second transparent EVA outer layer includes EVA resin composition, and the EVA resin composition includes the following components: EVA resin, anti PID auxiliary agent, first main crosslinking agent and second auxiliary crosslinking agent;The preparation raw material of transparent POE middle layer includes POE resin composition, and the POE resin composition includes the following components: POE resin, hydrolysis-resistant auxiliary agent, first main crosslinking agent and second auxiliary crosslinking agent.The EPE type three-layer co-extruded adhesive film provided by the present application, its preparation method is simple, significantly improves the anti PID performance and long-term aging performance of TOPCON battery photovoltaic single glass module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesive film packaging materials, in particular to an EPE type three-layer co-extrusion adhesive film and a preparation method and application thereof. BACKGROUND

[0002] The packaging material of a solar cell module is bonded to the upper and lower photovoltaic glass and backsheet, plays a role in preventing water vapor intrusion and preventing cell corrosion, and can provide protection for the solar cell module and improve the long-term stability of the solar cell module. At present, the single-glass solar cell module packaging on the market is mainly applied to distributed roof, ground photovoltaic power station and outdoor photovoltaic application, but under high temperature and high humidity conditions, there are problems such as easy corrosion of cell grid lines by water vapor and poor long-term aging performance, which causes the TOPCON cell single-glass market share to be low and cannot be widely applied.

[0003] Based on the requirements of lightweight module application to distributed roof, many double-glass TOPCON modules cannot meet the requirements of distributed roof load bearing, and if the backsheet of the single-glass packaging method is changed to a water-blocking aluminum backsheet, although it is good at blocking water, there are certain problems with edge insulation, which is easy to cause leakage current phenomenon, and other super water-blocking backsheet although it is good at blocking water, but the cost is high. At present, the DH2000h power attenuation of the conventional EPE single-glass packaging material is >5%, which cannot meet the requirements of photovoltaic modules in terms of long-term aging performance, and the DH2000h power attenuation of the conventional POE single-glass packaging material is <5%, which can meet the requirements in terms of long-term aging performance, but the POE packaging cost is high, and there are problems such as slipping with the cell, low laminating efficiency, etc.

[0004] CN118222200A provides a multilayer adhesive film for photovoltaic module packaging, which mainly includes an EVA layer and a POE layer with an additive inside, and a barrier layer tightly combined between the EVA layer and the POE layer. Among them, the barrier layer is added with a photoinitiator, a certain crosslinking degree is provided by using a pre-crosslinking process, and the POE layer is added with an inorganic micropowder adsorption additive containing multiple pores to prevent the additive in the POE from migrating to the EVA layer, has better water blocking performance, and the performance is stable. However, this scheme cannot effectively solve the PID phenomenon of solar cell modules under high temperature and high humidity conditions, and the barrier layer may yellow by using a photoinitiating irradiation process, which increases the operation complexity.

[0005] CN110041835A provides a kind of multilayer co-extrusion polarization type composite adhesive film and its preparation method, it uses the laminated structure mode of upper POE layer, polarization resistance layer and lower EVA layer, the polarization resistance layer is the acrylate copolymer containing ethylene segment, the prepared adhesive film has good compatibility with EVA and POE, has certain barrier property, can effectively solve the PID phenomenon that solar cell module appears in high pressure humid heat environment, and has good bonding performance with glass substrate and back sheet, improve the service life of module, but it will reduce the light transmittance, affect normal power generation efficiency, the anti-PID performance and corrosion resistance of the encapsulation adhesive film provided need to be further improved.

[0006] Therefore, the anti-PID performance and DH aging performance of the single-glass module need to be improved while ensuring the basic performance of the single-glass module. SUMMARY

[0007] To solve the above technical problems, the present application provides an EPE type three-layer co-extrusion adhesive film, its preparation method and application. The EPE type three-layer co-extrusion adhesive film not only has excellent anti-PID performance and anti-DH aging performance, but also has high power generation efficiency.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides an EPE type three-layer co-extrusion adhesive film, which includes a first transparent EVA outer layer, a transparent POE middle layer and a second transparent EVA outer layer arranged in order from top to bottom.

[0010] The preparation raw materials of the first transparent EVA outer layer and the second transparent EVA outer layer include an EVA resin composition, which includes the following components: EVA resin, anti-PID additive, first main crosslinking agent and second auxiliary crosslinking agent.

[0011] The preparation raw materials of the transparent POE middle layer include a POE resin composition, which includes the following components: POE resin, anti-hydrolysis additive, first main crosslinking agent and second auxiliary crosslinking agent.

[0012] The EPE type three-layer co-extrusion adhesive film provided by the present application includes a first transparent EVA outer layer, a second transparent EVA outer layer and a transparent POE middle layer. The transparent POE middle layer contains a hydrolysis-resistant additive, which inhibits the decomposition of the polymer, resulting in an excellent anti-yellowing and hydrolysis-resistant effect of the prepared solar cell module packaging structure. The transparent EVA outer layer contains an anti-PID additive, which can dissipate the charge accumulation on the surface of the battery, thereby improving the anti-PID performance of the solar cell module packaging structure.

[0013] The following are preferred technical solutions of the present application, but not as a restriction on the technical solutions provided by the present application. Through the following preferred technical solutions, the purposes and beneficial effects of the present application can be better achieved and implemented.

[0014] Preferably, the anti-PID aid includes any one or a combination of at least two of modified SEBS resin, polymethyl methacrylate, epoxy acrylate or ethylene-methyl methacrylate resin.

[0015] Preferably, the softening temperature of the anti-PID aid is 60-100°C, for example, it can be 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C or 100°C, etc.

[0016] Preferably, the anti-hydrolysis aid includes any one or a combination of at least two of alicyclic polycarbodiimide, aliphatic polycarbodiimide or aromatic polycarbodiimide, and is further preferably alicyclic polycarbodiimide.

[0017] Preferably, the melting temperature of the anti-hydrolysis aid is 70-90°C, for example, it can be 70°C, 75°C, 80°C, 82°C, 85°C or 90°C, etc.

[0018] Preferably, the EVA resin composition includes the following components by weight: EVA resin 90-100 parts by weight (for example, 90 parts by weight, 92 parts by weight, 94 parts by weight, 96 parts by weight, 98 parts by weight or 100 parts by weight, etc.), anti-PID aid 1-10 parts by weight (for example, 1.0 parts by weight, 2.0 parts by weight, 3.0 parts by weight, 4.0 parts by weight, 5.0 parts by weight, 6.0 parts by weight, 7.0 parts by weight, 8.0 parts by weight, 9.0 parts by weight or 10.0 parts by weight, etc.), first main crosslinking agent 0.5-1 parts by weight (for example, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight or 1.0 parts by weight, etc.), and second crosslinking aid 0.5-1.5 parts by weight (for example, 0.5 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 1.0 parts by weight, 1.2 parts by weight or 1.5 parts by weight, etc.).

[0019] Preferably, the POE resin composition includes the following components by weight parts: POE resin 92 to 100 weight parts (e.g., 92 weight parts, 94 weight parts, 96 weight parts, 98 weight parts, or 100 weight parts, etc.), anti-hydrolysis aid 0.2 to 2 weight parts (e.g., 0.2 weight parts, 0.4 weight parts, 0.6 weight parts, 0.8 weight parts, 1 weight parts, 1.2 weight parts, 1.4 weight parts, 1.6 weight parts, 1.8 weight parts, 2.0 weight parts, etc.), first main crosslinking agent 0.5 to 1.5 weight parts (e.g., 0.5 weight parts, 0.6 weight parts, 0.7 weight parts, 0.9 weight parts, 1.2 weight parts, or 1.5 weight parts, etc.), and second crosslinking aid 0.5 to 2.0 weight parts (e.g., 0.5 weight parts, e.g., 0.8 weight parts, 1.0 weight parts, 1.2 weight parts, 1.5 weight parts, 1.8 weight parts, or 2.0 weight parts, etc.).

[0020] Preferably, both the POE resin composition and the EVA resin composition further include a coupling agent and / or a light stabilizer.

[0021] Preferably, the content of the coupling agent in the EVA resin composition is 0.1 to 1.0 weight parts, e.g., can be 0.1 weight parts, 0.2 weight parts, 0.4 weight parts, 0.6 weight parts, 0.8 weight parts, or 1.0 weight parts, etc.

[0022] Preferably, the content of the light stabilizer in the EVA resin composition is 0.1 to 0.5 weight parts, e.g., can be 0.1 weight parts, 0.2 weight parts, 0.3 weight parts, 0.4 weight parts, or 0.5 weight parts, etc.

[0023] Preferably, the content of the coupling agent in the POE resin composition is 0.1 to 1.0 weight parts, e.g., can be 0.1 weight parts, 0.2 weight parts, 0.4 weight parts, 0.6 weight parts, 0.8 weight parts, or 1.0 weight parts, etc.

[0024] Preferably, the content of the light stabilizer in the POE resin composition is 0.1 to 0.5 weight parts, e.g., can be 0.1 weight parts, 0.2 weight parts, 0.3 weight parts, 0.4 weight parts, or 0.5 weight parts, etc.

[0025] Preferably, the coupling agent includes any one or a combination of at least two of vinyltrimethoxysilane, vinyltriethoxysilane, N-aminoethyl-3-aminopropylmethyldimethoxysilane, 3-(methacryloyloxypropyl)trimethoxysilane, or vinyltris(2-methoxyethoxy)silane.

[0026] Preferably, the light stabilizer comprises any one of or a combination of at least two of light stabilizer 123, light stabilizer 292, light stabilizer 770, light stabilizer 944, or light stabilizer 2020, further preferably light stabilizer 292.

[0027] Preferably, the first primary crosslinking agent comprises an organic peroxide initiator.

[0028] Preferably, the organic peroxide initiator comprises any one of or a combination of at least two of dicyclohexyl peroxydicarbonate, t-butyl peroxyisobutyrate, t-butyl peroxyacetate, diisopropyl peroxydicarbonate, t-butyl peroxy-2-ethylhexylcarbonate, t-amyl peroxy-2-ethylhexanoate carbonate, or t-hexyl peroxy-2-ethylhexanoate carbonate.

[0029] Preferably, the second co-crosslinking agent comprises any one of or a combination of at least two of triallyl isocyanurate, methyl trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tetraacrylate, tricyclodecane dimethanol diacrylate, tripropylene glycol diacrylate, or 1,6-hexanediol diacrylate.

[0030] Preferably, the EVA resin composition further comprises an acid absorbent.

[0031] Preferably, the acid absorbent is present in the EVA resin composition in an amount of 0.01 to 0.15 parts by weight, for example, 0.01 parts by weight, 0.03 parts by weight, 0.05 parts by weight, 0.1 parts by weight, 0.13 parts by weight, or 0.15 parts by weight, etc.

[0032] Preferably, the acid absorbent comprises any one of or a combination of at least two of magnesium hydroxide, magnesium oxide, calcium hydroxide, aluminum hydroxide, calcium carbonate, or magnesium aluminum hydrotalcite.

[0033] Preferably, the first and second transparent EVA outer layers each independently have a thickness of 150 to 200 μιη, for example, 150 μιη, 160 μιη, 170 μιη, 180 μιη, 190 μιη, or 200 μιη.

[0034] Preferably, the transparent POE middle layer has a thickness of 50 to 180 μιη, for example, 50 μιη, 60 μιη, 80 μιη, 100 μιη, 110 μιη, 130 μιη, 150 μιη, or 180 μιη.

[0035] Preferably, the EVA resin and the POE resin each independently have a melt index of 6 to 20 g / 10 min, for example, 6 g / 10 min, 8 g / 10 min, 12 g / 10 min, 15 g / 10 min, 18 g / 10 min, or 20 g / 10 min, etc.

[0036] Preferably, the light transmittance of the EVA resin and the POE resin is all > 82%, for example, it can be 84%, 85%, 86%, 87%, 88%, 89%, 90% or 92%, etc.

[0037] Preferably, the volume resistivity of the EVA resin is ≥ 1 × 10 15 Ω·cm, for example, it can be 1.5 × 10 15 Ω·cm, 1.8 × 10 15 Ω·cm, 2.5 × 10 15 Ω·cm, 3.2 × 10 15 Ω·cm or 4.0 × 10 15 Ω·cm, etc.

[0038] Preferably, the volume resistivity of the POE resin is ≥ 1 × 10 16 Ω·cm, for example, it can be 1.5 × 10 16 Ω·cm, 2.0 × 10 16 Ω·cm, 3.0 × 10 16 Ω·cm, 4.0 × 10 16 Ω·cm or 5.0 × 10 16 Ω·cm, etc.

[0039] In a second aspect, the present application provides a preparation method of the EPE type three-layer co-extruded adhesive film as described in the first aspect, the preparation method comprising the following steps: feeding the preparation raw material of the first transparent EVA outer layer, the preparation raw material of the transparent POE middle layer and the preparation raw material of the second transparent EVA outer layer into respective barrels, and then through hot melt extrusion, stretching, traction and winding to form the EPE type three-layer co-extruded adhesive film with the first transparent EVA outer layer, the transparent POE middle layer and the second transparent EVA outer layer arranged in order from top to bottom.

[0040] Preferably, the temperature of the hot melt extrusion is 80-110℃, for example, it can be 80℃, 82℃, 84℃, 88℃, 90℃, 92℃, 94℃, 98℃, 100℃, 102℃, 104℃, 108℃ or 110℃, etc.

[0041] In a third aspect, the present application provides the use of the EPE type three-layer co-extruded adhesive film as described in the first aspect in a laser sintering process TOPCON cell photovoltaic single-glass module.

[0042] Compared with the prior art, the present application has at least the following beneficial effects:

[0043] (1) The EPE type three-layer co-extrusion adhesive film provided by the application adds anti-PID additives and hydrolysis-resistant additives in the transparent EVA outer layer and the transparent POE middle layer respectively, and both of the additives have good compatibility with the resin, which further improves the volume resistivity and hydrolysis resistance without affecting the high transmittance, fluidity, strength and heat resistance of the system, and significantly reduces the PID and DH aging power attenuation of the product under high temperature and high humidity conditions through the combined use of the anti-PID additives and the hydrolysis-resistant additives.

[0044] (2) The EPE type three-layer co-extrusion adhesive film provided by the application has qualified light transmittance after crosslinking ((380-1100nm)>90%), qualified yellowing value (<3%), qualified PID 192h (<4%), and qualified DH 2000h (<4%).

[0045] (3) The preferred technical scheme of the application uses alicyclic polycarbodiimide as a hydrolysis-resistant additive, and compared with other hydrolysis-resistant additives, the alicyclic polycarbodiimide is used in combination with the anti-PID additive, and the product prepared has better excellent hydrolysis resistance. DETAILED DESCRIPTION

[0046] The technical scheme of the application will be further described through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the application, and should not be regarded as a specific limitation on the application.

[0047] The raw materials used in the following examples and comparative examples are as follows:

[0048] 1. EVA resin: EVA20F20, purchased from Yanshan Petrochemical, with a melt index of 20 g / 10 min and a VA content of 20%;

[0049] 2. POE resin: LF675, purchased from LG Chemical;

[0050] 3. Modified SEBS resin: MD-6932M, purchased from American Kraton;

[0051] 4. Ethylene-methyl methacrylate resin: WK402, purchased from Japan Sumitomo;

[0052] 5. Polymethyl methacrylate: LP3104, purchased from Japan Mitsubishi Rayon;

[0053] 6. Epoxy acrylate: GA-480, purchased from Akzo Nobel;

[0054] 7. Alicyclic polycarbodiimide: BIO-372, purchased from Jiangsu Keshengtong New Material;

[0055] 8. Aromatic polycarbodiimide: HM220, purchased from Shanghai Langyi New Material.

[0056] Example 1

[0057] An EPE type three-layer co-extruded adhesive film is composed of a first transparent EVA outer layer, a transparent POE middle layer, and a second transparent EVA outer layer from top to bottom.

[0058] The first and second transparent EVA outer layers are made of an EVA resin composition, and each has a thickness of 180 μm.

[0059] The EVA resin composition comprises the following components: 95.0 parts by weight of EVA resin, 5.0 parts by weight of modified SEBS resin, 0.5 parts by weight of peroxide carbonic acid-2-ethyl hexanoic acid tert-pentyl ester, 0.3 parts by weight of triallyl isocyanurate, 0.5 parts by weight of propoxylated trimethylolpropane triacrylate, 0.2 parts by weight of vinyl tris(2-methoxyethoxy)silane, 0.2 parts by weight of light stabilizer 292, and 0.1 parts by weight of acid-accepting agent magnesium aluminum hydrotalcite.

[0060] The transparent POE middle layer is made of a POE resin composition, and has a thickness of 100 μm.

[0061] The POE resin composition comprises the following components: 99.5 parts by weight of POE resin, 0.8 parts by weight of alicyclic polycarbodiimide, 0.8 parts by weight of peroxide carbonic acid-2-ethyl hexanoic acid tert-hexyl ester, 0.85 parts by weight of triallyl isocyanurate, 0.2 parts by weight of 1,6-hexanediol diacrylate, 0.3 parts by weight of 3-(methacryloyloxypropyl)trimethoxysilane, and 0.2 parts by weight of light stabilizer 292.

[0062] The method for preparing the EPE type three-layer co-extruded adhesive film comprises the following steps: feeding the EVA resin composition, the POE resin composition, and the EVA resin composition into respective barrels, and then performing hot melt extrusion, stretching, pulling, and winding to obtain the EPE type three-layer co-extruded adhesive film.

[0063] The temperature for the hot melt extrusion is 95℃.

[0064] Example 2

[0065] An EPE type three-layer co-extruded adhesive film is composed of a first transparent EVA outer layer, a transparent POE middle layer, and a second transparent EVA outer layer from top to bottom.

[0066] The first and second transparent EVA outer layers are made of an EVA resin composition, and each has a thickness of 200 μm.

[0067] The EVA resin composition includes the following components: EVA resin 90.0 parts by weight, ethylene-methyl methacrylate resin 2.0 parts by weight, dicumyl peroxide 0.7 parts by weight, methyltrihydroxymethylpropane triacrylate 0.2 parts by weight, pentaerythritol tetraacrylate 0.3 parts by weight, N-aminoethyl-3-aminopropyl methyl dimethoxy silane 0.5 parts by weight, light stabilizer 123 0.5 parts by weight, and acid absorbent magnesium hydroxide 0.1 parts by weight.

[0068] The transparent POE intermediate layer is prepared from a POE resin composition and has a thickness of 180 μm.

[0069] The POE resin composition includes the following components: POE resin 92 parts by weight, alicyclic polycarbodiimide 0.2 parts by weight, diisopropyl peroxydicarbonate 0.5 parts by weight, methyltrihydroxymethylpropane triacrylate 0.4 parts by weight, tricyclodecane dimethanol diacrylate 0.3 parts by weight, vinyltrimethoxysilane 0.3 parts by weight, and light stabilizer 123 0.2 parts by weight.

[0070] The EPE-type three-layer co-extruded adhesive film is prepared by feeding the EVA resin composition, the POE resin composition, and the EVA resin composition into respective barrels, and then extruding, stretching, pulling, and winding at 80°C to form the EPE-type three-layer co-extruded adhesive film.

[0071] The temperature of the hot melt extrusion is 80°C.

[0072] Example 3

[0073] An EPE-type three-layer co-extruded adhesive film is composed of, from top to bottom, a first transparent EVA outer layer, a transparent POE intermediate layer, and a second transparent EVA outer layer.

[0074] The first transparent EVA outer layer and the second transparent EVA outer layer are prepared from an EVA resin composition and have a thickness of 150 μm.

[0075] The EVA resin composition includes the following components: EVA resin 98.0 parts by weight, polymethyl methacrylate 8.0 parts by weight, tert-butyl peroxyisobutyrate 0.8 parts by weight, triallyl isocyanurate 0.6 parts by weight, propoxylated trimethylolpropane triacrylate 0.7 parts by weight, vinyltriethoxysilane 0.8 parts by weight, light stabilizer 770 0.1 parts by weight, and acid absorbent calcium carbonate 0.15 parts by weight.

[0076] The transparent POE intermediate layer is prepared from a POE resin composition and has a thickness of 50 μm.

[0077] The POE resin composition includes the following components: POE resin 95 parts by weight, alicyclic polycarbodiimide 1.5 parts by weight, t-butyl peroxy acetate 1.0 part by weight, triallyl isocyanurate 0.8 part by weight, tripropylene glycol diacrylate 0.6 part by weight, vinyl triethoxysilane 1.0 part by weight, and light stabilizer 770 0.1 part by weight.

[0078] The preparation method of the EPE type three-layer co-extruded adhesive film includes: respectively feeding the EVA resin composition, the POE resin composition, and the EVA resin composition into respective barrels, and then performing hot melt extrusion at 110 DEG C, stretching, traction, and winding to form the EPE type three-layer co-extruded adhesive film.

[0079] The temperature of the hot melt extrusion is 110 DEG C.

[0080] Example 4

[0081] An EPE type three-layer co-extruded adhesive film, which is different from that of Example 1 in that the anti-PID additive of the transparent EVA outer layer is selected to be epoxy acrylate.

[0082] Example 5

[0083] An EPE type three-layer co-extruded adhesive film, which is different from that of Example 1 in that the anti-PID additive of the EVA outer layer is selected to be a combination of modified SEBS resin 3.0 parts by weight and polymethyl methacrylate resin 2.0 parts by weight.

[0084] Example 6

[0085] An EPE type three-layer co-extruded adhesive film, which is different from that of Example 1 in that the anti-PID additive of the transparent EVA outer layer is selected to be a combination of modified SEBS resin 3.0 parts by weight and epoxy acrylate 2.0 parts by weight.

[0086] Example 7

[0087] An EPE type three-layer co-extruded adhesive film, which is different from that of Example 1 in that the anti-PID additive of the transparent EVA outer layer is selected to be a combination of ethylene-methyl methacrylate 3.0 parts by weight and polymethyl methacrylate resin 2.0 parts by weight.

[0088] Example 8

[0089] An EPE type three-layer co-extruded adhesive film, which is different from that of Example 1 in that the anti-PID additive of the transparent EVA outer layer is selected to be a combination of ethylene-methyl methacrylate 3.0 parts by weight and epoxy acrylate 2.0 parts by weight.

[0090] Example 9

[0091] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the anti-hydrolysis aid of the transparent POE middle layer is an aromatic polycarbodiimide.

[0092] Comparative Example 1

[0093] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the transparent EVA outer layer does not contain an anti-PID aid, and the transparent POE middle layer does not contain an anti-hydrolysis aid.

[0094] Comparative Example 2

[0095] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the transparent POE middle layer does not contain an anti-hydrolysis aid.

[0096] Comparative Example 3

[0097] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the anti-PID aid of the transparent EVA outer layer is selected to be ethylene-methyl methacrylate 5.0 parts by weight, and the transparent POE middle layer does not contain an anti-hydrolysis aid.

[0098] Comparative Example 4

[0099] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the transparent EVA outer layer does not contain an anti-PID aid.

[0100] Comparative Example 5

[0101] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the transparent EVA outer layer contains an anti-hydrolysis aid alicyclic polycarbodiimide 0.8 parts by weight, and the transparent POE middle layer does not contain an anti-hydrolysis aid.

[0102] Comparative Example 6

[0103] An EPE type three-layer co-extruded adhesive film, which differs from Example 1 in that the anti-hydrolysis aid of the transparent POE middle layer is a monomeric carbodiimide.

[0104] Test Method

[0105] Preparation of Back Adhesive Film White EVA Film:

[0106] The back adhesive film white EVA film is mainly composed of EVA resin composition, and the composition is composed of the following components by weight: 100 parts by weight of EVA resin, 0.8 parts by weight of titanium dioxide, 0.5 parts by weight of peroxide carbonic acid-2-ethyl hexanoate, 0.3 parts by weight of triallyl isocyanurate, 0.5 parts by weight of propoxylated trimethylolpropane triacrylate, 0.2 parts by weight of vinyl tri(2-methoxyethoxy) silane, 0.2 parts by weight of light stabilizer 292, and 0.1 parts by weight of acid absorber magnesium aluminum hydrotalcite.

[0107] The EPE encapsulation adhesive film and the white EVA adhesive film provided by the examples and comparative examples are respectively assembled into single glass assemblies, and the method is as follows:

[0108] Solar cell module encapsulation structure: glass + EPE adhesive film + Jite Tai LECO-TOPCON cell + white EVA adhesive film + white KPF backboard, wherein the glass is selected from 2mm calendering process glass; the thickness of the EPE adhesive film is 450μm, the transparent EVA layer is 180μm, and the transparent POE middle layer is 90μm; the thickness of the white EVA adhesive film is 380μm; the cell is selected from 182*72 standard version Jite Tai LECO-TOPCON cell, and the thickness is about 130μm.

[0109] After laminating the above structure, test it under the following laminating conditions: 145℃, vacuum time 5min, laminating time 10min.

[0110] Test standard

[0111] (1) Light transmittance: tested according to GB / T 29848-2018;

[0112] (2) UV+DH test: tested according to the test method provided in IEC 61215-2:2016, UV+DH test temperature is 85℃, relative humidity is 85%, and irradiation intensity is 150kWh / m 2 ;

[0113] (3) PID resistance test: tested according to the standard IEC 61215-2020, test temperature is 85℃, relative humidity is 85%, and time is 192h;

[0114] (4) Humidity resistance test: tested according to the test method provided in IEC 61215-2:2016, humidity test temperature is 85℃, relative humidity is 85%, and time is 2000h.

[0115] Test results

[0116] The EPE type three-layer co-extruded adhesive film provided by Examples 1-9 and Comparative Examples 1-6 was tested according to the above test method, and the test results are shown in Table 1.

[0117] Table 1

[0118]

[0119]

[0120] From the test results, it can be seen that:

[0121] (1) From Examples 1 to 8, it can be seen that by introducing anti-PID additives and anti-hydrolysis additives, the light transmittance of the prepared solar cell module packaging structure meets the requirement of > 90%, without affecting the light transmittance, the UV+DH test is up to 150KW, the yellowing value is < 3%, the PID 192h and DH 2000h results are < 3%.

[0122] (2) From Example 9, it can be seen that the anti-hydrolysis additive aromatic polycarbodiimide prepared solar cell module packaging structure DH2000h < 4%, but UV 150KW aging will cause serious yellowing, the yellowing value > 3%.

[0123] (3) Compared with Examples 1-8, the EPE adhesive film provided by Comparative Example 1 does not add anti-PID additives and anti-hydrolysis agents in the preparation raw materials, the prepared solar cell module packaging structure has a light transmittance of > 90%, UV+DH test up to 150KW, yellowing value < 3%, but PID 192h and DH 2000h are > 4%, which does not meet the requirements.

[0124] (4) Compared with Example 1, the EPE adhesive film provided by Comparative Example 2 adds anti-PID additive modified SEBS resin in the preparation raw materials, and does not add anti-hydrolysis agent, the prepared solar cell module packaging structure has a light transmittance of > 90%, UV+DH test up to 150KW, yellowing value < 3%, but PID 192h is qualified, DH 2000h > 4% unqualified.

[0125] (5) Compared with Examples 1-2, the EPE adhesive film provided by Comparative Example 3 adds anti-PID additive modified SEBS resin in the preparation raw materials, and does not add anti-hydrolysis agent, the light transmittance is > 90%, UV+DH test up to 150KW, yellowing value < 3%, PID 192h is qualified, DH 2000h > 4% unqualified.

[0126] (6) Compared with Example 1, the raw materials for preparing the EPE adhesive film provided by Comparative Example 4 do not add anti-PID additives, only add anti-hydrolysis agents, the light transmittance is slightly reduced, but meets the light transmittance requirement of > 90%; the UV+DH test reaches 150KW, the yellowing value is slightly increased, but meets the requirement of < 3%, the PID 192h is > 4% unqualified, and the DH 2000h is qualified.

[0127] (7) Compared with Example 1, the raw materials for preparing the EPE adhesive film provided by Comparative Example 5 contain 0.8 parts by weight of the anti-hydrolysis agent cycloaliphatic polycarbodiimide in the transparent EVA outer layer, and the transparent POE middle layer does not contain the anti-hydrolysis agent. When the transparent EVA outer layer contains both the anti-hydrolysis agent and the anti-PID agent, the anti-PID performance will be affected, the PID 192h is > 4% unqualified, and the DH 2000h is qualified.

[0128] (8) Compared with Example 1, the raw materials for preparing the EPE adhesive film provided by Comparative Example 6 replace the anti-hydrolysis agent with monomer carbodiimide, and the prepared solar cell module packaging structure DH 2000h is > 4%, which does not meet the requirement.

[0129] The applicant declares that the above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. An EPE type three-layer co-extruded adhesive film, characterized in that, The EPE type three-layer co-extrusion adhesive film comprises a first transparent EVA outer layer, a transparent POE middle layer and a second transparent EVA outer layer arranged in sequence from top to bottom. The preparation raw material of the first transparent EVA outer layer and the second transparent EVA outer layer comprises an EVA resin composition, the EVA resin composition comprises the following components according to weight parts: EVA resin 90-100 parts by weight, anti-PID additive 1-10 parts by weight, first main crosslinking agent 0.5-1 parts by weight and second auxiliary crosslinking agent 0.5-1.5 parts by weight. The preparation raw material of the transparent POE middle layer comprises a POE resin composition, the POE resin composition comprises the following components according to weight parts: POE resin 92-100 parts by weight, hydrolysis-resistant additive 0.2-2 parts by weight, first main crosslinking agent 0.5-1.5 parts by weight and second auxiliary crosslinking agent 0.5-2.0 parts by weight. The anti-PID additive comprises any one or a combination of at least two of modified SEBS resin, polymethyl methacrylate, epoxy acrylate or ethylene-methyl methacrylate resin. The hydrolysis-resistant additive comprises any one or a combination of at least two of alicyclic polycarbodiimide, aliphatic polycarbodiimide or aromatic polycarbodiimide.

2. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The hydrolysis-resistant additive is alicyclic polycarbodiimide.

3. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The POE resin composition and the EVA resin composition both further comprise a coupling agent and / or a light stabilizer.

4. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The content of the coupling agent in the EVA resin composition is 0.1-1.0 parts by weight.

5. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The content of the light stabilizer in the EVA resin composition is 0.1-0.5 parts by weight.

6. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The content of the coupling agent in the POE resin composition is 0.1-1.0 parts by weight.

7. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The content of the light stabilizer in the POE resin composition is 0.1-0.5 parts by weight.

8. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The coupling agent comprises any one or a combination of at least two of vinyl trimethoxysilane, vinyl triethoxysilane, N-aminoethyl-3-aminopropyl methyl dimethoxysilane, 3-(methacryloyloxypropyl) trimethoxysilane or vinyl tri(2-methoxyethoxy) silane.

9. The EPE type three-layer co-extruded adhesive film according to claim 3, characterized in that, The light stabilizer comprises any one or a combination of at least two of light stabilizer 123, light stabilizer 292, light stabilizer 770, light stabilizer 944 or light stabilizer 2020.

10. The EPE type three-layer co-extruded adhesive film according to claim 9, characterized in that, The light stabilizer is light stabilizer 292.

11. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The first main crosslinking agent comprises an organic peroxide initiator.

12. The EPE type three-layer co-extruded adhesive film according to claim 11, characterized in that, The organic peroxide initiator comprises any one or a combination of at least two of dicyclohexyl peroxydicarbonate, tert-butyl peroxyisobutyrate, tert-butyl peroxyacetate, diisopropyl peroxydicarbonate, tert-butyl peroxy-2-ethylhexyl carbonate, tert-hexyl peroxy-2-ethylhexyl carbonate or tert-hexyl peroxy-2-ethylhexyl carbonate.

13. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The second auxiliary crosslinking agent comprises any one or a combination of at least two of triallyl isocyanurate, methyl trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tetraacrylate, tricyclodecane dimethanol diacrylate, tripropylene glycol diacrylate or 1,6-hexanediol diacrylate.

14. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The EVA resin composition further comprises an acid absorbent.

15. The EPE type three-layer co-extruded adhesive film according to claim 14, characterized in that, The acid absorbent is present in the EVA resin composition in an amount of 0.01 to 0.15 parts by weight.

16. The EPE type three-layer co-extruded adhesive film according to claim 14, characterized in that, The acid absorbent comprises any one or a combination of at least two of magnesium hydroxide, magnesium oxide, calcium hydroxide, aluminum hydroxide, calcium carbonate or magnesium-aluminum hydrotalcite.

17. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The first and second transparent EVA outer layers each independently have a thickness of 150 to 200 μm.

18. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The transparent POE middle layer has a thickness of 50 to 180 μm.

19. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The EVA resin and POE resin each independently has a melt index of 6 to 20 g / 10 min.

20. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The EVA resin and POE resin each has a light transmittance of > 82%.

21. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The volume resistivity of the EVA resin is ≥ 1 x 10 15 Ω-cm.

22. The EPE type three-layer co-extruded adhesive film according to claim 1, characterized in that, The POE resin has a volume resistivity ≥ 1 x 10 16 Ω-cm.

23. A process for the preparation of the EPE type three-layer co-extruded adhesive film according to any one of claims 1-22, characterized by, The preparation method comprises the steps of: feeding the raw materials for preparing the first and second transparent EVA outer layers and the transparent POE middle layer into respective barrels, and then performing hot melt extrusion, stretching, pulling and winding to form an EPE-type three-layer co-extruded adhesive film having the first transparent EVA outer layer, the transparent POE middle layer and the second transparent EVA outer layer arranged in order from top to bottom.

24. The method of claim 23, wherein, The temperature for the hot melt extrusion is 80 to 110 °C.

25. Use of the EPE-type three-layer co-extruded adhesive film according to any one of claims 1 to 22 in a laser sintering process TOPCON solar cell photovoltaic monolithic module.

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