CN115895100B - Gain casting film, preparation method and application thereof - Google Patents
Gain casting film, preparation method and application thereof Download PDFInfo
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Abstract
The application discloses a gain casting film, a preparation method and application thereof. The preparation method of the gain casting film comprises the following steps: uniformly mixing the ethylene-octene copolymer resin of the layer A, the silane grafted monomer, the initiator, the nucleating agent, the ultraviolet light stabilizer and the antioxidant, uniformly mixing the ethylene-octene copolymer resin of the layer B, the silane grafted monomer, the initiator, the nucleating agent, the ultraviolet light conversion agent, the ultraviolet light stabilizer and the antioxidant, uniformly mixing the ethylene-octene copolymer resin of the layer C, the silane grafted monomer, the initiator, the nucleating agent, the light dispersing agent, the ultraviolet light stabilizer and the antioxidant, extruding, casting, embossing, cooling, traction and rolling to obtain the gain casting film. The curtain coating membrane that this application made can high-efficient light of catching, has improved photovoltaic module's generating efficiency to can reduce photovoltaic module's risk of ageing, photovoltaic module's life is longer.
Description
Technical Field
The present application relates to the field of plastic film forming processing, and more particularly, to a gain casting film, a preparation method and applications thereof.
Background
The crystalline silicon solar cell module is generally manufactured by vacuum lamination of photovoltaic glass, a casting film, a cell, a casting film and a back plate which are sequentially arranged from top to bottom. The curtain coating film has the functions of bonding the photovoltaic glass, the battery piece and the backboard together in the photovoltaic module, protecting the battery piece and isolating air, and is one of key materials of the photovoltaic module. The casting film may be classified into an EVA casting film, a POE casting film, and an EPE casting film according to the base material. POE is a block copolymer of ethylene and octene, and the soft chain crimp structure of octene and crystallized ethylene chain are used as crosslinking points, so that the POE has excellent toughness, good processability and stronger PID resistance. With the continuous development of the photovoltaic industry, the power of the photovoltaic module is larger and larger, so that the PID resistance of the photovoltaic module becomes more important, and therefore, the POE casting film starts to gradually replace the EVA casting film and is widely applied to the photovoltaic module.
Currently, in order to improve the power generation efficiency of crystalline silicon solar cell modules, the following modes are generally adopted to make full use of sunlight for the photovoltaic modules: (1) The back plate is set to be white in color, the irradiation light between the plate spacing and the string spacing is reflected to the battery plate by utilizing the reflection of the white back plate, the utilization rate of the battery plate to the gap light in the assembly is improved, but the gain of the power generation efficiency is not obvious due to the low reflectivity of the back plate; (2) The casting film on the back of the battery piece is directly set to be white, so that light can be directly reflected to the battery piece by the white casting film, the loss that the light reflected by the back plate is absorbed when passing through the casting film on the back of the battery piece is reduced, and the reflectivity is improved; (3) Chinese patent CN 102140314a provides an EVA film with high reflectivity, which uses the EVA film with high reflectivity as a casting film on the back of a battery piece to improve the utilization rate of the battery piece to the gap light in the component, but the method directly adds inorganic reflective materials such as titanium dioxide into the casting film, so that the casting film on the front and back of the battery piece may cross-melt, which affects the light transmittance of the casting film on the front of the battery piece, and the photovoltaic component can only generate electricity in daytime, so that the overall power generation efficiency is not good.
Chinese patent CN 102863916a provides a POE spectral conversion solar cell casting film, which adds rare earth light conversion particles into the POE casting film, effectively converts ultraviolet light and infrared light into visible light, and improves the power generation efficiency of the photovoltaic module, but the method has the following two problems: 1. the addition amount of the rare earth light conversion particles is high, so that the light transmittance of the casting film is reduced; 2. the rare earth light conversion particles themselves have a low absorption coefficient, so that their gain in overall power is limited.
Disclosure of Invention
In order to solve the technical problems, the application provides a gain casting film, a preparation method and application thereof.
In a first aspect, the present application provides a method for preparing a gain casting film, which adopts the following technical scheme:
a method of preparing a gain cast film comprising the steps of:
uniformly mixing the components in the layer A, the layer B and the layer C respectively, extruding at the temperature of 80-120 ℃, and carrying out tape casting, embossing, cooling, traction and winding to obtain a gain tape casting film; wherein the layer A comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-10 parts of nucleating agent, 0.05-0.6 part of ultraviolet stabilizer and 0.1-0.6 part of antioxidant; the layer B comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-10 parts of nucleating agent, 0.05-0.5 part of ultraviolet light conversion agent, 0.05-0.6 part of ultraviolet light stabilizer and 0.1-0.6 part of antioxidant; the layer C comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-15 parts of nucleating agent, 0.1-5 parts of light dispersing agent, 0.05-0.6 part of ultraviolet stabilizer and 0.1-0.6 part of antioxidant; and the weight ratio of the nucleating agent in the layer A, the layer B and the layer C is 1 (1.05-1.1) (1.15-1.25).
Through adopting above-mentioned technical scheme, the application is evenly mixed A, B, C three-layer used raw materials respectively, then pours into A, B, C three hoppers of twin-screw extruder respectively to extrude at certain temperature, obtain the extrudate, layer A, layer B and layer C respectively become the face in the extrudate, and the interface is clear, later makes gain casting film with the extrudate through follow-up operations such as casting. The curtain coating membrane of this application includes A, B, C three-layer, all added the nucleating agent that has ultraviolet scattering function in every layer, and this application is through the weight ratio of nucleating agent in every layer of control, and then the distribution condition of control nucleating agent at every layer, make A, B, C three-layer refracting index increase in proper order, every layer is to the refracting power of light strengthen gradually, make incident sunlight reachs the battery piece as far as possible through three-layer refracting, by the battery piece absorption utilization, the purpose of light trapping has been reached, the capture capacity of curtain coating membrane to light has been improved, the possibility of light escape subassembly has been reduced, the battery piece has been improved the utilization ratio of incident sunlight, thereby photovoltaic module's generating efficiency has been improved.
In addition, the ultraviolet light conversion agent capable of converting ultraviolet light into visible light is further added into the layer B, so that the utilization rate of the photovoltaic module to sunlight is further improved. Meanwhile, the nucleating agent and the ultraviolet light conversion agent are mixed and matched for use, the synergistic effect of the nucleating agent and the ultraviolet light conversion agent is fully exerted, the use amount of the ultraviolet light conversion agent is reduced to a large extent, the possibility that the overall light transmittance of the casting film is reduced due to excessive addition amount of the ultraviolet light conversion agent is reduced, and therefore the power generation efficiency of the photovoltaic module is further improved. In addition, the optical design is carried out on the casting film, so that the ultraviolet light absorber is not added in the casting film, the sunlight can be fully utilized, the ageing risk of the casting film is reduced, and the long-term service life of the photovoltaic module is prolonged. The preparation method is simple, easy to operate and suitable for large-scale industrial production.
Preferably, the nucleating agents in the layer A, the layer B and the layer C are nano silicon dioxide, wherein the particle size of the nano silicon dioxide is smaller than 100nm.
Preferably, the ultraviolet light conversion agent is rare earth nanocrystals, wherein the rare earth nanocrystals have a particle size of 5-50nm.
By adopting the technical scheme, the rare earth nanocrystals are adopted as the ultraviolet light conversion agent, so that ultraviolet light can be effectively converted into visible light to be absorbed and utilized by the photovoltaic module. Because the light absorption coefficient of the rare earth nanocrystal is low, the rare earth organic complex is generally adopted to replace the rare earth nanocrystal at present, but the photo-aging performance of the organic complex is generally poor, the outdoor service life is about 3 years, the yellowing problem can be caused after the organic complex is aged, the light transmittance of a casting film is reduced, and the long-term use of the photovoltaic module can be influenced.
Therefore, the nucleating agent and the rare earth nanocrystals are matched for use, and the synergistic effect of the nucleating agent and the rare earth nanocrystals is fully exerted, so that the organic complex of the rare earth nanocrystals is not required to be additionally added to improve the light absorption coefficient of the rare earth nanocrystals, the photovoltaic module can have higher sunlight utilization rate, the risk of aging phenomena of the casting film due to the use of the organic complex is reduced, and the long-term service life of the photovoltaic module is prolonged. Rare earth nanocrystals of the present application include, but are not limited to, naYF 4 :Er 3+ 、NaYF 4 :Yb 3+ 、Pr 3+ 、GdAl 3 (BO 3 ) 4 :Yb 3+ 、Tb 3+ 。
Preferably, the light dispersing agent is PMMA microsphere, wherein the particle size of the PMMA microsphere is 1000-2500nm.
Through adopting above-mentioned technical scheme, this application adopts PMMA microballon as light diffusion agent for the even illumination of light has improved the light diffusivity of curtain coating membrane on the battery piece.
Preferably, the silane grafting monomer in the layer A, the layer B and the layer C is one or more of vinyl trimethoxysilane, vinyl tri (B-methoxyethoxy) silane, vinyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane and vinyl triisopropoxysilane.
By adopting the technical scheme, one or more of vinyl trimethoxy silane, vinyl tri (B-methoxyethoxy) silane, vinyl triethoxy silane, gamma-methacryloxypropyl trimethoxy silane and vinyl triisopropoxy silane are adopted as the modifier of the casting film, so that the crosslinking degree of the casting film is effectively improved, and the casting film has better PID resistance, bonding performance and ageing resistance.
Preferably, the initiator in the layer A, the layer B and the layer C is one or more of dicumyl peroxide, di-tert-butyl dicumyl peroxide, tert-butyl peroxy-2-ethylhexyl carbonate and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane.
Preferably, the method comprises the steps of, the ultraviolet light stabilizer in the layer A, the layer B and the layer C is 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis (2, 6-tetramethyl piperidinyl) sebacate one or more of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite, bis (1-octyloxy-2, 6-tetramethyl-4-piperidinyl) sebacate.
Preferably, the antioxidants in the A layer, the B layer and the C layer are one or more of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], N-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, N '-bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thio-bis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate and tris (2, 4-di-tert-butylphenyl) phosphite.
In a second aspect, the present application provides a gain cast film made by the method of making a gain cast film.
In a third aspect, the present application provides an application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 10-30mm and the string spacing of 2-3mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass in sequence from top to bottom, carrying out vacuum lamination treatment at 145-160 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Through adopting above-mentioned technical scheme, the white POE glued membrane of this application has higher reflectivity, can make the light that reaches this place get back inside the subassembly by reflection as far as possible. According to the photovoltaic module, the gain casting film is utilized to enable solar rays incident from the photovoltaic glass and rays converted by the ultraviolet light conversion agent in the layer B to irradiate on the battery piece as much as possible, and meanwhile, the light diffusion agent in the layer C is utilized to be matched with the white POE film, so that the rays are restrained inside the module, the rays can be fully absorbed and utilized by the battery piece, and the power generation efficiency of the photovoltaic module is improved. And, this application has still controlled the battery piece interval in specific range, if the battery piece interval is too little, can make the reflection angle when light reflects between the battery piece reduce, and reflection light also reduces thereupon, has reduced photovoltaic module's generating efficiency.
In summary, the present application has the following technical effects:
1. the casting film can efficiently capture light, improves the utilization rate of solar light by the battery piece, and remarkably enhances the power generation efficiency of the photovoltaic module;
2. the use amount of rare earth nanocrystals in the casting film is less, and the light transmittance is higher;
3. the casting film does not adopt an organic complex of an ultraviolet absorber and rare earth nanocrystals, so that the ageing risk is reduced, and the long-term service life of the photovoltaic module is prolonged;
4. according to the application, the casting film is matched with the high-reflection white POE adhesive film in the photovoltaic module, so that the utilization of gap light in the photovoltaic module by the battery piece is improved.
Detailed Description
The present application is described in further detail below with reference to examples.
Material source
The ethylene-octene copolymer resin of the present application, available from dow, model 9500, usa;
PMMA microspheres of the present application were purchased from Siam Aziyue Biotech Co., ltd;
vinyl trimethoxysilane, CAS, of the present application: 2768-02-7;
vinyl tris (B-methoxyethoxy) silane, CAS:1067-53-4;
vinyl triethoxysilane, CAS, of the present application: 78-08-0;
gamma-methacryloxypropyl trimethoxysilane, CAS, of the present application: 2530-85-0;
vinyl triisopropoxysilane, CAS, of the present application: 18023-33-1;
dicumyl peroxide, CAS:80-43-3;
bis-t-butylperoxy diisopropylbenzene, CAS:2212-81-9;
t-butyl peroxy-2-ethylhexyl carbonate, CAS:34443-12-4;
2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane, CAS:78-63-7;
cetyl 3, 5-di-tert-butyl-4-hydroxy-benzoate, CAS:97845-93-6;
bis (2, 6-tetramethylpiperidinyl) sebacate, CAS:52829-07-9;
tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite, CAS:95733-09-8;
bis (1-octyloxy-2, 6-tetramethyl-4-piperidinyl) sebacate, CAS:129757-67-1;
pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] of the present application, CAS:6683-19-8;
beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate n-stearyl ester, CAS:2082-79-3;
n, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine, CAS:23128-74-7;
2, 6-Di-tert-butyl-p-cresol, CAS:128-37-0;
4,4' -thiobis (3-methyl-6-tert-butylphenol) herein, CAS:96-69-5;
thiodipropionate dilaurate, CAS of the present application: 123-28-4;
tris (2, 4-di-t-butylphenyl) phosphite, CAS:31570-04-4;
the white POE adhesive film is purchased from Forst, and is of a model white high-reflection series TFW-8015;
the specification of the welding belt used in the application is 0.27 multiplied by 1.0mm, the thickness of the copper base material is 0.28-0.30mm, and the resistivity is 0.01mΩ -m;
NaYF of the present application 4 :Er 3+ 、NaYF 4 :Yb 3+ 、Pr 3+ 、GdAl 3 (BO 3 ) 4 : Yb 3+ 、Tb 3+ All from the company xianruixi biotechnology limited.
The gain casting film in the embodiment of the application is specifically a gain packaging film.
Example 1
A method of preparing a gain cast film comprising the steps of:
firstly, uniformly mixing 100kg of ethylene-octene copolymer resin, 0.3kg of vinyl trimethoxysilane, 0.6kg of dicumyl peroxide, 5.25kg of nano silicon dioxide (the particle size is smaller than 100 nm), 0.6kg of 3, 5-di-tert-butyl-4-hydroxy-hexadecyl benzoate and 0.1kg of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester in the layer A to obtain a mixture A;
100kg of ethylene-octene copolymer resin, 1.1kg of vinyl tri (B-methoxyethoxy) silane, 0.05kg of di-tert-butyl-peroxide-diisopropylbenzene, 5.51kg of nano-silica (particle size smaller than 100 nm), 0.05kg of rare earth nanocrystals (NaYF) 4 :Er 3+ The grain size is 5-50 nm), 0.25kg of bis (2, 6-tetramethyl piperidinyl) sebacate and 0.27kg of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester are uniformly mixed to obtain a mixture B;
uniformly mixing 100kg of ethylene-octene copolymer resin, 3kg of vinyltriethoxysilane, 1kg of tert-butyl peroxy-2-ethylhexyl carbonate, 6.04kg of nano silicon dioxide (with the particle size smaller than 100 nm), 0.1kg of PMMA microsphere (with the particle size of 1000-2500 nm), 0.05kg of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite and 0.6kg of N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine in the layer C to obtain a mixture C;
then respectively pouring into A, B, C hoppers of a double-screw extruder, extruding at the temperature of 80 ℃, and then carrying out tape casting, embossing, cooling, traction and winding to obtain the gain tape casting film.
Example 2
A method of preparing a gain cast film comprising the steps of:
firstly, uniformly mixing 100kg of ethylene-octene copolymer resin, 1.7kg of gamma-methacryloxypropyl trimethoxysilane, 0.05kg of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 9kg of nano silicon dioxide (the particle size is smaller than 100 nm), 0.33kg of bis (1-octyloxy-2, 6-tetramethyl-4-piperidinyl) sebacate and 0.35kg of 2, 6-di-tert-butyl-p-cresol in the layer A to obtain a mixture A;
100kg of ethylene-octene copolymer resin, 3kg of vinyl triisopropoxy silane, 1kg of di-tert-butyl peroxide diisopropylbenzene, 9.9kg of nano silicon dioxide (particle size smaller than 100 nm), 0.25kg of rare earth nano crystal (NaYF) 4 :Yb 3+ Particle size of 5-50 nm), 0.05kg of 3, 5-di-tert-butyl-4-hydroxy-benzeneCetyl formate and 0.6kg of 4,4' -thiobis (3-methyl-6-tert-butylphenol) were mixed homogeneously to obtain a mixture B;
uniformly mixing 100kg of ethylene-octene copolymer resin, 0.3kg of vinyltrimethoxysilane, 0.85kg of dicumyl peroxide, 11.25kg of nano silicon dioxide (the particle size is smaller than 100 nm), 2.55kg of PMMA microspheres (the particle size is 1000-2500 nm), 0.6kg of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite and 0.1kg of thiodipropionate to obtain a mixture C;
then respectively pouring into A, B, C hoppers of a double-screw extruder, extruding at the temperature of 100 ℃, and then carrying out tape casting, embossing, cooling, traction and winding to obtain the gain tape casting film.
Example 3
A method of preparing a gain cast film comprising the steps of:
firstly, uniformly mixing 100kg of ethylene-octene copolymer resin, 3kg of vinyl tri (B-methoxyethoxy) silane, 1kg of peroxy-2-ethylhexyl tert-butyl carbonate, 0.5kg of nano silicon dioxide (the particle size is smaller than 100 nm), 0.05kg of 3, 5-di-tert-butyl-4-hydroxy-hexadecyl benzoate and 0.6kg of tri (2, 4-di-tert-butylphenyl) phosphite ester in the layer A to obtain a mixture A;
100kg of ethylene-octene copolymer resin, 0.3kg of vinyltriethoxysilane, 0.8kg of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 0.54kg of nano-silica (particle size less than 100 nm), 0.5kg of rare earth nanocrystals (Tb 3+ The particle size is 5-50 nm), 0.6kg of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite and 0.1kg of 2, 6-di-tert-butyl-p-cresol are uniformly mixed to obtain a mixture B;
uniformly mixing 100kg of ethylene-octene copolymer resin, 2kg of vinyltrimethoxysilane, 0.05kg of dicumyl peroxide, 0.6kg of nano silicon dioxide (the particle size is smaller than 100 nm), 5kg of PMMA microspheres (the particle size is 1000-2500 nm), 0.45kg of bis (2, 6-tetramethylpiperidinyl) sebacate and 0.4kg of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecanol ester in the layer C to obtain a mixture C;
then respectively pouring into A, B, C hoppers of a double-screw extruder, extruding at 120 ℃, and then carrying out tape casting, embossing, cooling, traction and winding to obtain the gain tape casting film.
Example 4
A method for producing a gain casting film, which is different from example 3 in that: 9kg of nano silicon dioxide in the layer A, 9.45kg of nano silicon dioxide in the layer B and 11.25kg of nano silicon dioxide in the layer C.
Example 5
A method for producing a gain casting film, which is different from example 3 in that: 9kg of nano silicon dioxide in the layer A, 9.9kg of nano silicon dioxide in the layer B and 10.35kg of nano silicon dioxide in the layer C.
Comparative example 1
The packaging adhesive film of example 2 was used in a solar cell packaging adhesive film with POE spectral conversion and a method for preparing the same, which were described in chinese patent CN 102863916 a.
Comparative example 2
The difference from example 3 is that: the casting film is not set to three layers;
the method comprises the following specific steps: 300kg of ethylene-octene copolymer resin, 5.3kg of vinyl tri (B-methoxyethoxy) silane, 1.85kg of tert-butyl peroxy-2-ethylhexyl carbonate, 1.64kg of nano-silica, 1.1kg of hexadecyl 3, 5-di-tert-butyl-4-hydroxy-benzoate, 1.1kg of tri (2, 4-di-tert-butylphenyl) phosphite, 0.5kg of rare earth nanocrystal Tb 3+ And 5kg of PMMA microspheres are mixed and stirred uniformly, then poured into a hopper of a double-screw extruder, extruded at the temperature of 120 ℃ to obtain an extrudate, and the extrudate is cast, embossed, cooled, pulled and rolled.
Comparative example 3
The difference from example 3 is that: setting the casting film into two layers;
the method comprises the following specific steps: s1, uniformly mixing 100kg of ethylene-octene copolymer resin, 3kg of vinyl tri (B-methoxyethoxy) silane, 1kg of tert-butyl peroxy-2-ethylhexyl carbonate, 0.5kg of nano silicon dioxide (particle size is smaller than 100 nm), 0.05kg of 3, 5-di-tert-butyl-4-hydroxy-hexadecyl benzoate and 0.6kg of tri (2, 4-di-tert-butylphenyl) phosphite ester in the layer A to obtain a mixture A;
200kg of ethylene-octene copolymer resin, 2.3kg of vinyltriethoxysilane, 0.85kg of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 1.14kg of nano-silica, 0.5kg of rare earth nano-crystal Tb in layer B 3+ 1.05kg of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite, 0.5kg of 2, 6-di-tert-butyl-p-cresol and 5kg of PMMA microspheres were uniformly mixed to obtain a mixture B;
then respectively pouring into A, B hoppers of a double-screw extruder, extruding at the temperature of 120 ℃, and casting, embossing, cooling, traction and rolling.
Comparative example 4
The difference from example 3 is that: the nano silicon dioxide is not added into the layer B, and the rest are the same.
Comparative example 5
The difference from example 3 is that: eu (TTA) 3phen is adopted to replace Tb in the layer B 3+ All the others are the same, wherein Eu (TTA) 3phen is purchased from Siamiliaxi Biotechnology Co.
Comparative example 6
The difference from example 3 is that: the weight ratio of the nano silicon dioxide in the layer A to the nano silicon dioxide in the layer B to the nano silicon dioxide in the layer C is 1:1.02:1.5, specifically 0.5kg of the layer A, 0.51kg of the layer B and 0.75kg of the layer C.
Comparative example 7
The difference from example 3 is that: the amount of nano-silica used in the A layer was 0.1kg, the amount of nano-silica used in the B layer was 0.11kg, and the amount of nano-silica used in the C layer was 0.12kg.
Comparative example 8
The difference from example 3 is that: the usage amount of nano silicon dioxide in the layer A is 15kg, the usage amount of nano silicon dioxide in the layer B is 16.13kg, and the usage amount of nano silicon dioxide in the layer C is 18kg.
Application example 1
An application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 10mm and the string spacing of 2mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass which are prepared in the embodiment 1 in sequence from top to bottom, carrying out vacuum lamination treatment at 145 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Application example 2
An application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 30mm and the string spacing of 3mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass which are prepared in the embodiment 2 in sequence from top to bottom, carrying out vacuum lamination treatment at 160 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Application example 3
An application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 20mm and the string spacing of 2mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass which are prepared in the embodiment 3 in sequence from top to bottom, carrying out vacuum lamination treatment at the temperature of 150 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Application example 4
An application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 20mm and the string spacing of 2mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass which are prepared in the embodiment 4 in sequence from top to bottom, carrying out vacuum lamination treatment at the temperature of 150 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Application example 5
An application of a gain casting film, comprising the steps of:
I. welding strips are adopted, and welding arrangement is carried out according to the cell spacing of 20mm and the string spacing of 2mm, so that a cell group is obtained;
stacking the photovoltaic glass, the gain casting film, the battery piece group, the white POE adhesive film and the photovoltaic glass which are prepared in the embodiment 5 in sequence from top to bottom, carrying out vacuum lamination treatment at the temperature of 150 ℃, and then carrying out junction box installation and aluminum frame edge sealing operation to obtain a photovoltaic module; wherein, layer A of gain tape casting film contacts with photovoltaic glass, and layer B contacts with the battery piece.
Comparative application example 1
The difference from application example 3 is that: the gain casting film was replaced with a plain transparent casting film, the remainder being the same, wherein the plain transparent casting film was purchased from foster, model F406P.
Comparative application example 2
The difference from application example 3 is that: the white POE adhesive film is replaced by the transparent casting film, and the rest are the same.
Comparative application example 3
The difference from application example 3 is that: in the step I, the spacing of the battery pieces is 5mm, and the rest are the same.
Comparative application examples 4 to 11
The difference from application example 3 is that: the gain casting films were the same as the adhesive films prepared in comparative examples 1 to 8.
Performance detection
And (3) testing the power generation efficiency and aging performance: the photovoltaic modules prepared in application examples 1-5 and comparative application examples 1-11 are subjected to power generation efficiency test and power generation efficiency after tightening aging with reference to IEC 61215 crystalline silicon photovoltaic module for ground-design identification and shaping, and the tightening aging conditions are specifically as follows: the test of DH2000h (temperature 85 ℃ C., relative humidity 85% aging for 2000 h) is carried out, and then ultraviolet irradiation of 300kwh/m is carried out 2 Finally, PID test is carried out for 96 hours (the temperature is 85 ℃, the relative humidity is 85%, and the negative pressure is 1000V in direct current voltage environment), and the test results are shown in Table 1.
Table 1 photovoltaic resistive performance test results table
Furthermore, the gain casting films prepared in examples 1 to 5 were also tested for light transmittance values at wavelengths λ=555, 700, 900nm using a spectrophotometer, and according to the formula: transmittance= (T) 555 +T 700 +T 900 ) And 3, calculating the light transmittance of the gain casting film, wherein the light transmittance of the first casting film and the second casting film prepared in the embodiments 1-5 is above 95.7% through calculation, which shows that the possibility that light is reflected away is reduced by carrying out optical design on the refractive index of each layer of the casting film, so that the light is transmitted through the casting film as much as possible, the light transmittance of the casting film is improved, and the usage amount of rare earth nanocrystals in the casting film is less, so that the light transmittance of the casting film is further improved.
From table 1, it can be seen that the power generated by the photovoltaic module prepared in application examples 1-5 is above 283.5w, and the power generated after the tightening test can still be above 282.2w, which indicates that the casting film in application examples 1-5 can make light reach the battery pieces as much as possible, and improves the utilization ratio of the battery pieces to sunlight, thereby improving the power generation efficiency of the photovoltaic module.
The power generation efficiency of the comparative application example 1 is smaller than that of the application example 3, which shows that the cast film prepared by the application can improve the power generation efficiency of the photovoltaic module, and the power attenuation is less after the severe aging test.
The power generation efficiency of comparative application example 2 is less than application example 3, and it is further provided with the high-reflection white POE glued membrane at the battery piece back to indicate this application, can form the cooperation with the light diffusion agent in this application curtain coating membrane, fully restrict light between curtain coating membrane and white POE glued membrane, has improved the battery piece and has utilized the rate of clearance light to photovoltaic module's generating efficiency has been improved.
The power generation efficiency of comparative application example 3 is smaller than that of application example 3, which means that if the spacing between the battery pieces is too small, the reflection angle of the light rays reflected between the battery pieces is reduced, and the reflected light rays are also reduced, so that the power generation efficiency of the photovoltaic module is reduced.
The power generation efficiency of comparative application example 4 is smaller than that of application example 3, which shows that the cast film prepared by the application can improve the power generation efficiency of the photovoltaic module, and the power attenuation is less after the tight aging test.
The comparative application examples 5-7 have lower power generation efficiency than application example 3, which means that the casting film is provided with three layers, the refractive indexes of the three layers are sequentially increased, the refractive power of the light is sequentially increased, so that the light reaches the battery piece as much as possible and is absorbed and utilized by the battery piece, and the effect of light trapping of the casting film is reduced due to the lack of one layer or the absence of a nucleating agent in one layer, thereby reducing the power generation efficiency of the photovoltaic module.
The power generation efficiency of the comparative application example 8 is not much different from that of the application example, but the power attenuation is larger after the application example is subjected to the tightening aging test, which shows that the organic complex of the rare earth nanocrystals can obviously reduce the aging resistance of the photovoltaic module.
The comparative application example 9 has a lower power generation efficiency than application example 3, which demonstrates that the present application can further improve the power generation efficiency of the photovoltaic module by further controlling the weight ratio of the nucleating agent in the three layers of the casting film.
The comparative examples 10-11 have a lower power generation efficiency than example 3, indicating that the present application further controls the ratio of the nucleating agent in each layer of the cast film, and can further control the distribution of the nucleating agent in each layer, thereby improving the power generation efficiency of the photovoltaic module.
The embodiments of the present invention are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (6)
1. A method for producing a gain casting film, comprising the steps of:
uniformly mixing the components in the layer A, the layer B and the layer C respectively, extruding at the temperature of 80-120 ℃, and carrying out tape casting, embossing, cooling, traction and winding to obtain a gain tape casting film; the gain casting film comprises A, B, C three layers, the refractive indexes of the A, B, C three layers are sequentially increased, and the refractive capacity of each layer for light is gradually enhanced, so that incident sunlight reaches the battery plate as much as possible through the refraction of the three layers and is absorbed and utilized by the battery plate; wherein the layer A comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-10 parts of nucleating agent, 0.05-0.6 part of ultraviolet stabilizer and 0.1-0.6 part of antioxidant; the layer B comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-10 parts of nucleating agent, 0.05-0.5 part of ultraviolet light conversion agent, 0.05-0.6 part of ultraviolet light stabilizer and 0.1-0.6 part of antioxidant; the layer C comprises the following components in parts by weight: 100 parts of ethylene-octene copolymer resin, 0.3-3 parts of silane grafted monomer, 0.05-1 part of initiator, 0.5-15 parts of nucleating agent, 0.1-5 parts of light dispersing agent, 0.05-0.6 part of ultraviolet stabilizer and 0.1-0.6 part of antioxidant; and the weight ratio of the nucleating agent in the layer A, the layer B and the layer C is 1 (1.05-1.1): 1.15-1.25;
the nucleating agents in the layer A, the layer B and the layer C are nano silicon dioxide, wherein the particle size of the nano silicon dioxide is smaller than 100nm;
the ultraviolet light conversion agent is rare earth nanocrystals, wherein the particle size of the rare earth nanocrystals is 5-50nm;
the silane grafting monomer in the layer A, the layer B and the layer C is one or more of vinyl trimethoxy silane, vinyl tri (B-methoxyethoxy) silane, vinyl triethoxy silane, gamma-methacryloxypropyl trimethoxy silane and vinyl triisopropoxy silane.
2. The method for preparing a gain casting film according to claim 1, wherein the light diffusing agent is PMMA microspheres, and wherein the particle size of the PMMA microspheres is 1000-2500nm.
3. The method for producing a gain casting film according to claim 1, wherein the initiator in the a layer, the B layer and the C layer is one or more of dicumyl peroxide, di-t-butyldicumyl peroxide, t-butyl peroxy-2-ethylhexyl carbonate, and 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane.
4. A method for producing a gain casting film according to claim 1, wherein, the ultraviolet light stabilizer in the layer A, the layer B and the layer C is 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis (2, 6-tetramethyl piperidinyl) sebacate one or more of tris (1, 2, 6-pentamethyl-4-piperidinyl) phosphite, bis (1-octyloxy-2, 6-tetramethyl-4-piperidinyl) sebacate.
5. The method for producing a gain casting film according to claim 1, wherein the antioxidants in the a layer, the B layer and the C layer are one or more of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], N-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, N '-bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thiobis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate, tris (2, 4-di-tert-butylphenyl) phosphite.
6. A gain casting film produced by the production method of a gain casting film according to any one of claims 1 to 5.
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