A high-viscosity encapsulation film for solar photovoltaic cells and preparation method thereof

Abstract

The present invention discloses a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, wherein the encapsulation film is composited by a first film layer and a second film layer. The first film layer and the second film layer use POE as a polyolefin resin, and introduce a POE grafted polar monomer, thereby improving the polarity of POE, improving the compatibility of the initiator, co-crosslinking agent, coupling agent and POE resin matrix in the film components, and preventing the migration of the auxiliary agent from affecting the performance of the film; at the same time, the POE grafted polar monomer introduced in the first film layer contains acrylic acid or epoxy functional groups, which can well increase the viscosity between the film and the surface of the HJT battery.

Description

Technical Field

[0001] The invention relates to the field of packaging materials for solar photovoltaic cell assemblies, and in particular to a high-viscosity packaging adhesive film for solar photovoltaic cells and a preparation method thereof. Background Art

[0002] As a green renewable energy source, solar photovoltaic power generation is being developed by various countries under the background of global "carbon peak" and "carbon neutrality". Solar cell modules are the core components that convert light energy into electrical energy. They are made by laminating photovoltaic glass, cells and back panels together through encapsulation films.

[0003] Crystalline silicon heterojunction solar cells (HJT cells) are a new type of cell technology that has become more popular and developed rapidly in recent years because of their high photoelectric conversion efficiency. HJT cells are formed by amorphous silicon and crystalline silicon materials. They are N-type cells that deposit amorphous silicon thin films on crystalline silicon. They have the advantages of high conversion efficiency, high bifaciality, no light decay, low temperature coefficient, bright response to weak light, fewer process steps, and easy thinning.

[0004] However, the ITO layer on the surface of the HJT battery is sensitive to water vapor and has weak adhesion to conventional adhesive films. Therefore, developing a high-viscosity adhesive film suitable for HJT battery module packaging is of great significance to promoting the development of HJT battery technology. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a high-viscosity encapsulation adhesive film for solar photovoltaic cells and a preparation method thereof, which further improves the bonding performance between the adhesive film and the cell sheet.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] As a first aspect of the present invention, the present invention provides a high-viscosity encapsulation adhesive film for solar photovoltaic cells, which is composited by a first adhesive film layer and a second adhesive film layer.

[0008] The raw materials for preparing the first adhesive film layer include, by weight: 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier A, 0.1-1 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, and 0.01-1.5 parts of heat stabilizer.

[0009] The raw materials for preparing the second adhesive film layer include, by weight: 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier B, 0.2-2 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, 0.01-1.5 parts of UV absorber, and 0.01-1.5 parts of heat stabilizer.

[0010] As one embodiment of the present invention, the polyolefin resin is a copolymer of ethylene and butene or octene (POE).

[0011] As one embodiment of the present invention, the initiator is one or more of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl peroxy isopropyl carbonate, and 2,2-bis(tert-butylperoxy)butane.

[0012] As one embodiment of the present invention, the auxiliary cross-linking agent is one or more of triallyl isocyanurate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, triallyl isocyanate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, 3 (propoxy) propylene triacrylate, and 3 (ethoxy) trimethylolpropane triacrylate.

[0013] As one embodiment of the present invention, the polar tackifier A is one or more of POE-g-methyl acrylate, POE-g-ethyl acrylate, POE-g-butyl acrylate, POE-g-glycidyl acrylate, POE-g-glycidyl methacrylate, POE-g-polyglycidyl methacrylate, POE-g-allyl glycidyl ether, POE-g-ethylene-acrylate-glycidyl methacrylate, POE-g-styrene-methyl methacrylate-glycidyl methacrylate terpolymer, POE-g-styrene-acrylonitrile-glycidyl methacrylate terpolymer, and POE-g-ethylene-butyl acrylate-glycidyl methacrylate.

[0014] As one embodiment of the present invention, the polar tackifier B is one or more of POE-g-methacryloxypropyltrimethoxysilane, POE-g-vinyltrimethoxysilane, POE-g-vinyltriethoxysilane, POE-g-vinyltriacetoxysilane, and POE-g-vinylsilane oligomer.

[0015] As one embodiment of the present invention, the coupling agent is one or more of r-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, r-aminopropyltriethoxysilane, r-(2,3-propylene oxide)propyltrimethoxysilane, vinylpropoxydimethyl oligosilane, methacryloxy silane oligomer, and vinyl silane oligomer.

[0016] As an embodiment of the present invention, the UV stabilizer is one or more of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate, bis-2,2,6,6-tetramethylpiperidinol sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, and 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine.

[0017] As an embodiment of the present invention, the UV absorber is one or more of 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-acryloyloxyethoxybenzophenone, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, and 2-(2-hydroxy-5-methylphenyl)benzotriazole.

[0018] As one embodiment of the present invention, the thermal stabilizer is one or more of di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and tris(2,4-di-tert-butylphenyl) phosphite.

[0019] As a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned high-viscosity encapsulation film for solar photovoltaic cells, comprising the following steps:

[0020] S1: According to the raw material ratio, 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier A, 0.1-1 parts of coupling agent, 0.01-1.5 parts of UV stabilizer and 0.01-1.5 parts of heat stabilizer are weighed and added into a mixing kettle, and stirred at 30°C-50°C until the liquid additives are completely absorbed by the polymer resin;

[0021] S2: According to the raw material ratio, 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier B, 0.2-2 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, 0.01-1.5 parts of UV absorber, and 0.01-1.5 parts of heat stabilizer are weighed and added into a mixing kettle, and stirred at a temperature of 30°C-50°C until the liquid additives are completely absorbed by the polymer resin;

[0022] S3: adding the raw material obtained from S1 into the No. 1 extruder of the casting machine, adding the raw material obtained from S2 into the No. 2 extruder of the casting machine, melting and casting in the temperature range of 60°C-100°C, forming the first film layer by casting through the No. 1 extruder, forming the second film layer by casting through the No. 2 extruder, and compounding the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells.

[0023] The total thickness of the high-viscosity packaging film is 0.2 to 0.8 mm;

[0024] The thickness of the first adhesive film layer is 0.1-0.7 mm, and the thickness of the second adhesive film layer is 0.1-0.7 mm.

[0025] As a third aspect of the present invention, the present invention provides a photovoltaic cell assembly comprising the high-viscosity solar photovoltaic cell packaging film of the present invention.

[0026] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0027] The first adhesive film layer and the second adhesive film layer of the present invention introduce POE grafted polar monomers, which improves the polarity of POE and improves the compatibility of the initiator, co-crosslinking agent, coupling agent and POE resin matrix in the adhesive film components, thereby preventing the migration of such additives and thus affecting the performance of the adhesive film; at the same time, the POE grafted polar monomers introduced into the first adhesive film layer contain acrylic acid or epoxy functional groups, which can greatly increase the adhesion between the adhesive film and the surface of the HJT battery. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiment of the present invention will be clearly and completely described below. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiment 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. It should be noted that, in the case of no conflict, the features in the embodiment in the present invention and the embodiment can be combined with each other. In addition, it is worth noting that the raw materials involved in the present invention are all common commercial products unless otherwise specified.

[0029] Example 1

[0030] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0031] S1: According to the raw material ratio, 100 parts of POE resin, 0.2 parts of initiator 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 3 parts of co-crosslinking agent triallyl isocyanurate, 0.2 parts of polar tackifier POE-g-methyl acrylate, 1 part of coupling agent r-methacryloxypropyl trimethoxysilane, 0.01 parts of UV stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and 0.01 parts of heat stabilizer di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate were weighed and added into a mixing kettle, and stirred at 40°C until the liquid additives were completely absorbed by the polymer resin;

[0032] S2: According to the raw material ratio, 100 parts of POE resin, 0.2 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 3 parts of auxiliary crosslinking agent triallyl isocyanate, 0.2 parts of polar tackifier POE-g-methacryloxypropyl trimethoxysilane, 2 parts of coupling agent vinyl trimethoxysilane, 0.01 parts of UV stabilizer poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate, 0.01 parts of UV absorber 2-hydroxy-4-n-octyloxybenzophenone, 0.01 parts of heat stabilizer di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate were weighed and added into a mixing kettle, and stirred at 40°C until the liquid additives were completely absorbed by the polymer resin;

[0033] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.1mm thick, the second film layer is 0.7mm thick, and the total film thickness is 0.8mm.

[0034] Example 2

[0035] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0036] S1: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 0.2 parts of cross-linking agent trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-butyl acrylate, 0.1 parts of coupling agent vinyl triethoxysilane, 1.5 parts of UV stabilizer bis-2,2,6,6-tetramethylpiperidinol sebacate, and 1.5 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0037] S2: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator peroxy-2-ethylhexyl carbonate, 0.2 parts of ethoxylated trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-vinyltrimethoxysilane, 0.2 parts of coupling agent vinyltriacetoxysilane, 1.5 parts of UV stabilizer bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 1.5 parts of UV absorber 2-hydroxy-4-acryloyloxyethoxybenzophenone, 1.5 parts of thermal stabilizer tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0038] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.2mm thick, the second film layer is 0.5mm thick, and the total film thickness is 0.7mm.

[0039] Example 3

[0040] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0041] S1: According to the raw material ratio, 100 parts of POE resin, 2 parts of initiator 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane, 2 parts of co-crosslinking agent diethylene glycol dimethacrylate, 10 parts of polar tackifier POE-g-glycidyl methacrylate, 5 parts of polar tackifier POE-g-ethylene-butyl acrylate-glycidyl methacrylate, 0.3 parts of coupling agent r-aminopropyl triethoxysilane, 1 part of UV stabilizer 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine, and 1 part of heat stabilizer tris(2,4-di-tert-butylphenyl) phosphite were weighed and added into a mixing kettle, and stirred at 45°C until the liquid additives were completely absorbed by the polymer resin;

[0042] S2: According to the raw material ratio, 100 parts of POE resin, 2 parts of initiator tert-butyl peroxy isopropyl carbonate, 2 parts of cross-linking agent trimethylolpropane trimethacrylate, 15 parts of polar tackifier POE-g-vinyl triethoxysilane, 0.3 parts of coupling agent r-(2,3-propylene oxide)propyl trimethoxysilane, 1 part of UV stabilizer bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 1 part of UV absorber 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, and 1 part of thermal stabilizer tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester were weighed and added into a mixing kettle, and stirred at 45°C until the liquid additives were completely absorbed by the polymer resin;

[0043] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.3mm thick, the second film layer is 0.3mm thick, and the total film thickness is 0.6mm.

[0044] Example 4

[0045] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0046] S1: According to the raw material ratio, 100 parts of POE resin, 1 part of initiator 2,2-bis(tert-butylperoxy)butane, 1.2 parts of cross-linking agent trimethylolpropane trimethacrylate, 5 parts of polar tackifier POE-g-allyl glycidyl ether, 5 parts of polar tackifier POE-g-styrene-methyl methacrylate-glycidyl methacrylate terpolymer, 0.4 parts of coupling agent vinyl propoxy dimethyl oligosilane, 0.5 parts of UV stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and 0.5 parts of heat stabilizer di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate were weighed and added into a mixing kettle, and stirred at 35°C until the liquid additives were completely absorbed by the polymer resin;

[0047] S2: According to the raw material ratio, 100 parts of POE resin, 1 part of initiator 2,2-bis(tert-butylperoxy)butane, 1.2 parts of cross-linking agent trimethylolpropane trimethacrylate, 10 parts of polar tackifier POE-g-vinyltriacetoxysilane, 0.4 parts of coupling agent methacryloxy silane oligomer, 0.5 parts of UV stabilizer bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 0.5 parts of UV absorber 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, and 0.5 parts of thermal stabilizer tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester were weighed and added into a mixing kettle, and stirred at 35°C until the liquid additives were completely absorbed by the polymer resin;

[0048] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.7mm thick, the second film layer is 0.1mm thick, and the total film thickness is 0.8mm.

[0049] Example 5

[0050] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0051] S1: According to the raw material ratio, 100 parts of POE resin, 0.7 parts of initiator tert-butyl peroxy-2-ethylhexyl carbonate, 0.4 parts of co-crosslinking agent 3 (propoxy) propylene glycol triacrylate, 0.4 parts of co-crosslinking agent ethoxylated pentaerythritol tetraacrylate, 2 parts of polar tackifier POE-g-ethyl acrylate, 3 parts of polar tackifier POE-g-ethylene-acrylate-glycidyl methacrylate, 0.6 parts of coupling agent vinyl silane oligomer, 0.1 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate, and 0.1 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate are weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives are completely absorbed by the polymer resin;

[0052] S2: According to the raw material ratio, 100 parts of POE resin, 0.7 parts of initiator tert-butyl peroxy-2-ethylhexyl carbonate, 0.4 parts of co-crosslinking agent 3 (propoxy) propylene glycol triacrylate, 0.4 parts of co-crosslinking agent ethoxylated pentaerythritol tetraacrylate, 5 parts of polar tackifier POE-g-vinyl triacetoxy silane, 0.6 parts of coupling agent vinyl silane oligomer, 0.1 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate, 0.1 parts of UV absorber 2-(2-hydroxy-5-methylphenyl) benzotriazole, and 0.1 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 35°C until the liquid additives were completely absorbed by the polymer resin;

[0053] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.1mm thick, the second film layer is 0.1mm thick, and the total film thickness is 0.2mm.

[0054] Example 6

[0055] This embodiment provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, the preparation steps comprising:

[0056] S1: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 3 parts of polar tackifier POE-g-styrene-acrylonitrile-methacrylate glycidyl terpolymer, 3 parts of polar tackifier POE-g-polymethacrylate glycidyl ester, 0.2 parts of coupling agent vinyl trimethoxysilane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate, and 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0057] S2: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 6 parts of polar tackifier POE-g-vinyl silane oligomer, 0.7 parts of coupling agent vinyl trimethoxy silane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) succinate, 0.2 parts of UV absorber 2-(2-hydroxy-5-methylphenyl) benzotriazole, and 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0058] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.3mm thick, the second film layer is 0.2mm thick, and the total film thickness is 0.5mm.

[0059] Comparative Example 1

[0060] This comparative example provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, and the preparation steps include:

[0061] S1: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 0.2 parts of coupling agent vinyl trimethoxysilane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate, 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0062] S2: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 6 parts of polar tackifier POE-g-vinyl silane oligomer, 0.7 parts of coupling agent vinyl trimethoxy silane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) succinate, 0.2 parts of UV absorber 2-(2-hydroxy-5-methylphenyl) benzotriazole, and 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0063] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.3mm thick, the second film layer is 0.2mm thick, and the total film thickness is 0.5mm.

[0064] Comparative Example 2

[0065] This comparative example provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, and the preparation steps include:

[0066] S1: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 0.2 parts of coupling agent vinyl trimethoxysilane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate, 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0067] S2: According to the raw material ratio, 100 parts of POE resin, 0.4 parts of initiator tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of initiator tert-amyl peroxide-2-ethylhexyl carbonate, 0.5 parts of co-crosslinking agent pentaerythritol tetraacrylate, 0.3 parts of co-crosslinking agent 3 (ethoxy) trimethylolpropane triacrylate, 0.7 parts of coupling agent vinyl trimethoxysilane, 0.2 parts of UV stabilizer poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) succinate, 0.2 parts of UV absorber 2-(2-hydroxy-5-methylphenyl) benzotriazole, 0.2 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 30°C until the liquid additives were completely absorbed by the polymer resin;

[0068] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.3mm thick, the second film layer is 0.2mm thick, and the total film thickness is 0.5mm.

[0069] Comparative Example 3

[0070] This comparative example provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, and the preparation steps include:

[0071] S1: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 0.2 parts of cross-linking agent trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-butyl acrylate, 0.1 parts of coupling agent vinyl triethoxysilane, 1.5 parts of UV stabilizer bis-2,2,6,6-tetramethylpiperidinol sebacate, and 1.5 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0072] S2: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator peroxy-2-ethylhexyl carbonate, 0.2 parts of ethoxylated trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-butyl acrylate, 0.2 parts of coupling agent vinyl triacetoxy silane, 1.5 parts of UV stabilizer bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 1.5 parts of UV absorber 2-hydroxy-4-acryloyloxyethoxy benzophenone, 1.5 parts of thermal stabilizer tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0073] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.2mm thick, the second film layer is 0.5mm thick, and the total film thickness is 0.7mm.

[0074] Comparative Example 4

[0075] This comparative example provides a high-viscosity encapsulation film for solar photovoltaic cells and a preparation method thereof, and the preparation steps include:

[0076] S1: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 0.2 parts of cross-linking agent trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-vinyltrimethoxysilane, 0.1 parts of coupling agent vinyltriethoxysilane, 1.5 parts of UV stabilizer bis-2,2,6,6-tetramethylpiperidinol sebacate, and 1.5 parts of heat stabilizer β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecyl alcohol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0077] S2: According to the raw material ratio, 100 parts of POE resin, 3 parts of initiator peroxy-2-ethylhexyl carbonate, 0.2 parts of ethoxylated trimethylolpropane triacrylate, 20 parts of polar tackifier POE-g-vinyltrimethoxysilane, 0.2 parts of coupling agent vinyltriacetoxysilane, 1.5 parts of UV stabilizer bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 1.5 parts of UV absorber 2-hydroxy-4-acryloyloxyethoxybenzophenone, 1.5 parts of thermal stabilizer tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester were weighed and added into a mixing kettle, and stirred at 50°C until the liquid additives were completely absorbed by the polymer resin;

[0078] S3: Add the raw material obtained in S1 to the No. 1 extruder of the casting machine, add the raw material obtained in S2 to the No. 2 extruder of the casting machine, melt and cast at a temperature range of 60°C-100°C, cast the No. 1 extruder to form the first film layer, cast the No. 2 extruder to form the second film layer, and compound the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells. The first film layer is 0.2mm thick, the second film layer is 0.5mm thick, and the total film thickness is 0.7mm.

[0079] Detection Example

[0080]

[0081]

[0082]

[0083] The HJT cell peel strength test is conducted according to the NB / T 10200-2019 method. The first adhesive layer is bonded to the cell; the second adhesive layer is bonded to the glass or backplane. Lamination process: 145°C lamination for 15 minutes.

[0084] Evaluation method for additive precipitation: Place the film on oil-absorbing paper, with the second film layer in contact with the oil-absorbing paper; then place the sample in a vacuum oven at 80°C and heat for 6 hours. After taking it out, use another oil-absorbing paper to absorb the liquid on the surface of the first film layer, and weigh the mass change before and after the two pieces of oil-absorbing paper.

[0085] It can be seen from the test data in the table that the high-viscosity packaging film prepared by the present invention can significantly improve the adhesion between the film and the HJT battery, while maintaining a high adhesion between the film and the glass and the back panel, and can effectively prevent the leakage of additives, which is beneficial to improving the service life of solar cell modules.

[0086] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A high-viscosity encapsulation film for solar photovoltaic cells, characterized in that: It is composed of a first adhesive film layer and a second adhesive film layer; the raw materials for preparing the first adhesive film layer include, by weight: 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of auxiliary cross-linking agent, 0.2-20 parts of polar tackifier A, 0.1-1 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, and 0.01-1.5 parts of heat stabilizer; The raw materials for preparing the second adhesive film layer include, by weight: 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier B, 0.2-2 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, 0.01-1.5 parts of UV absorber, and 0.01-1.5 parts of heat stabilizer; The polar tackifier A is one or more of POE-g-methyl acrylate, POE-g-ethyl acrylate, POE-g-butyl acrylate, POE-g-glycidyl acrylate, POE-g-glycidyl methacrylate, POE-g-polyglycidyl methacrylate, POE-g-allyl glycidyl ether, POE-g-ethylene-acrylate-glycidyl methacrylate, POE-g-styrene-methyl methacrylate-glycidyl methacrylate terpolymer, POE-g-styrene-acrylonitrile-glycidyl methacrylate terpolymer, and POE-g-ethylene-butyl acrylate-glycidyl methacrylate; The polar tackifier B is one or more of POE-g-methacryloxypropyltrimethoxysilane, POE-g-vinyltrimethoxysilane, POE-g-vinyltriethoxysilane, POE-g-vinyltriacetoxysilane, and POE-g-vinylsilane oligomer.

2. The high-viscosity encapsulation film for solar photovoltaic cells according to claim 1, characterized in that: The polyolefin resin is a copolymer of ethylene and butene or octene.

3. The high-viscosity encapsulation film for solar photovoltaic cells according to claim 1, characterized in that: The initiator is one or more of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl peroxy isopropyl carbonate, and 2,2-bis(tert-butylperoxy)butane; And / or, the auxiliary cross-linking agent is one or more of triallyl isocyanurate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, triallyl isocyanate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, 3 (propoxy) propylene glycol triacrylate, and 3 (ethoxy) trimethylolpropane triacrylate; And / or, the coupling agent is one or more of r-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, r-aminopropyltriethoxysilane, r-(2,3-propylene oxide)propyltrimethoxysilane, vinylpropoxydimethyl oligosilane, methacryloxy silane oligomer, and vinyl silane oligomer; And / or, the UV stabilizer is one or more of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate, bis-2,2,6,6-tetramethylpiperidinol sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, and 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine; And / or, the UV absorber is one or more of 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-acryloyloxyethoxybenzophenone, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, and 2-(2-hydroxy-5-methylphenyl)benzotriazole; And / or, the heat stabilizer is one or more of di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and tris(2,4-di-tert-butylphenyl) phosphite.

4. The high-viscosity encapsulation film for solar photovoltaic cells according to any one of claims 1 to 3, characterized in that: The total thickness of the packaging film is 0.2-0.8 mm.

5. The high-viscosity encapsulation film for solar photovoltaic cells according to claim 4, characterized in that: The thickness of the first adhesive film layer is 0.1-0.7 mm, and the thickness of the second adhesive film layer is 0.1-0.7 mm.

6. The method for preparing the high-viscosity encapsulation film for solar photovoltaic cells according to any one of claims 1 to 5, characterized in that: The steps include: S1: According to the raw material ratio, 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier A, 0.1-1 parts of coupling agent, 0.01-1.5 parts of UV stabilizer and 0.01-1.5 parts of heat stabilizer are weighed and added into a mixing kettle, and stirred at 30°C-50°C until the liquid additives are completely absorbed by the polymer resin; S2: According to the raw material ratio, 100 parts of polyolefin resin, 0.2-3 parts of initiator, 0.2-3 parts of co-crosslinking agent, 0.2-20 parts of polar tackifier B, 0.2-2 parts of coupling agent, 0.01-1.5 parts of UV stabilizer, 0.01-1.5 parts of UV absorber, and 0.01-1.5 parts of heat stabilizer are weighed and added into a mixing kettle, and stirred at a temperature of 30°C-50°C until the liquid additives are completely absorbed by the polymer resin; S3: adding the raw material obtained from S1 into the No. 1 extruder of the casting machine, adding the raw material obtained from S2 into the No. 2 extruder of the casting machine, melting and casting in the temperature range of 60°C-100°C, forming the first film layer by casting through the No. 1 extruder, forming the second film layer by casting through the No. 2 extruder, and compounding the first film layer and the second film layer through the die head of the casting machine to obtain a high-viscosity encapsulation film for solar photovoltaic cells.

7. A photovoltaic cell assembly, characterized in that: A high-viscosity encapsulation film for solar photovoltaic cells comprising any one of claims 1 to 5.

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