CN111682083A - High-reflectivity black solar cell back plate and preparation method thereof - Google Patents
High-reflectivity black solar cell back plate and preparation method thereof Download PDFInfo
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- CN111682083A CN111682083A CN202010486157.5A CN202010486157A CN111682083A CN 111682083 A CN111682083 A CN 111682083A CN 202010486157 A CN202010486157 A CN 202010486157A CN 111682083 A CN111682083 A CN 111682083A
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- black
- parts
- ethylene
- solar cell
- layer
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
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Abstract
The invention relates to the technical field of solar cells, in particular to a high-reflectivity black solar cell back plate and a preparation method thereof, wherein the solar cell back plate comprises a weather-resistant layer, an adhesive layer and a black reflecting layer which are sequentially arranged from top to bottom, and the black reflecting layer comprises the following raw materials in parts by weight: 20-90 parts of first polyolefin resin, 15-90 parts of first adhesive resin and 10-25 parts of black functional master batch. The back plate can have 25-80% reflectivity for near infrared light of 700-1100 nanometers, can reflect the near infrared light to crystal silicon, and improves the absorption and conversion efficiency of the solar cell back plate on solar spectrums.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a high-reflectivity black solar cell back plate and a preparation method thereof.
Background
Currently where photovoltaic modules are integrated in building structures, their backsheets are typically dark colored, e.g., black, to blend the photovoltaic modules with existing building colors, typically creating the dark or even black appearance of the backsheets by coating the backsheets with pigment carbon black or iron oxide or by mixing these pigments with the constituent materials of the backsheets during the manufacturing process of the backsheets. Carbon black absorbs substantially all of the light visible to humans, and in addition, carbon black also absorbs near infrared red light having a wavelength of about 700 nm to 1100nm, so existing ordinary black back sheets can substantially absorb photoelectric effect energy of crystalline silicon to sunlight, which causes a low photoelectric conversion efficiency of black components compared to white components, and since more light energy is absorbed by the black components, the temperature of the back sheet and ultimately the operating temperature of the entire photovoltaic module is increased, causing a safety hazard.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a high-reflectivity black solar cell backboard, which has a reflectivity of 25-80% for near-infrared light of 700-1100nm and can reflect the near-infrared light to crystalline silicon, so that the absorption and conversion efficiency of the solar cell backboard to solar spectra is improved.
The invention also aims to provide a preparation method of the high-reflectivity black solar cell back plate, which is simple and efficient, convenient to operate and control, high in quality of produced products, beneficial to industrial production and capable of improving the absorption and conversion efficiency of the prepared solar cell back plate on solar spectrums.
The purpose of the invention is realized by the following technical scheme: a high-reflectivity black solar cell backboard comprises a weather-resistant layer, an adhesive layer and a black reflecting layer which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer is 20-350 mu m, and the black reflecting layer comprises the following raw materials in parts by weight:
20-90 parts of first polyolefin resin
15-90 parts of first adhesive resin
10-25 parts of black functional master batch.
The black reflecting layer adopted by the black solar cell backboard can convert light with the wavelength range of 280-400nm into near infrared light with the wavelength range of 700-1100nm, so that the backboard has the reflectivity of 25-80% for the near infrared light with the wavelength range of 700-1100nm, the near infrared light can be reflected to crystal silicon, and the absorption and conversion efficiency of the solar cell backboard on solar spectra is improved.
Preferably, each part of the black functional master batch comprises the following raw materials in parts by weight:
5-25 parts of second polyolefin resin
5-25 parts of second adhesive resin
40-90 parts of black auxiliary agent.
Preferably, each part of the first polyolefin resin is at least one of polyethylene, chlorinated polyethylene, crosslinked polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, ethylene-cycloolefin copolymer, and polypropylene; more preferably, the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 0.8 to 1.2:0.6 to 1.0:0.4 to 0.8.
Preferably, each part of the second polyolefin resin is at least one of polyethylene, chlorinated polyethylene, crosslinked polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, ethylene-cycloolefin copolymer and polypropylene; more preferably, the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer in a weight ratio of 0.8-1.2:0.6-1.0: 0.4-0.8.
In the invention, the quality of the adopted first olefin resin and second olefin resin needs to be strictly controlled, if the mass part is too small, the overall polarity of the product is reduced, the barrier property of polar water vapor molecules is influenced, and if the mass part is too large, the proportion of black functional master batch or black auxiliary agent is reduced, so that the water vapor barrier property of the solar cell back plate is not improved; the specific polyolefin resin can improve the tensile strength of the black reflecting layer film to a certain degree.
Preferably, each part of the first adhesive resin is an ethylene-unsaturated ester copolymer and/or polyvinyl butyral; each part of the second adhesive resin is ethylene-unsaturated ester copolymer and/or polyvinyl butyral; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 15 to 85%, and the ethylene-unsaturated ester copolymer is any one of EAA, EMAA, EEA, EMA, EMMA, and EMAH.
The specific first adhesive resin and second adhesive resin used in the present invention have excellent adhesion, weather resistance and corrosion resistance, and have better characteristic requirements for use in a back sheet since the molar ratio of unsaturated ester in the ethylene-unsaturated ester copolymer to the ethylene-unsaturated ester copolymer is controlled to 15 to 85%.
Preferably, each part of the black auxiliary agent comprises the following raw materials in parts by weight:
preferably, each part of the black functional filler comprises the following raw materials in parts by weight:
the specific pigment adopted in the invention is a composite pigment prepared by a subtractive color mixing method in a color matching theory, wherein the superposition of three primary colors of red, yellow and blue can obtain pure black, and the specific nanometer rare earth oxide can convert light in a wavelength range of 280-plus 400nm into light in a wavelength range of 700-plus 1100nm while participating in color matching of the three primary colors, and simultaneously convert light in a wavelength range of 280-plus 400nm, so that the damage of ultraviolet light in the wavelength range to the backboard can be reduced.
Preferably, each part of the pigment red is at least one of iron red, molybdate red, azo red, perylene red, quinacridone red and anthraquinone red; the pigment yellow is at least one of aryl yellow, cadmium yellow, cobalt yellow, Napellus yellow, fluorescent yellow, nickel titanium yellow, pyrimidine yellow, isoindolinone yellow, quinacridone yellow, nickel nitrogen yellow and benzimidazolone yellow; the pigment blue is at least one of cobalt blue, phthalocyanine blue, ultramarine and iron blue; the nano rare earth oxide is Gd2O3:Eu3+Or GdVO4:Eu3+Or XVO4:Ln3+And X is at least one of Ln, Eu, Dy, Sm and Er.
The black functional filler adopted in the invention is blended into black by three-component color superposition, and the specific nanometer rare earth oxide can convert light with the wavelength range of 280-400nm into light with the wavelength range of 700-1100nm while participating in color matching of three primary colors, so that the back plate has the high-reflectivity effect of 25-80% for near infrared light with the wavelength range of 700-1100 nm.
Preferably, each part of the antioxidant is at least one of aromatic amine antioxidant, hindered phenol antioxidant, triphenyl phosphite and thiodipropionic acid diester; the aromatic amine antioxidant is at least one of diphenylamine, p-phenylenediamine and dihydroquinoline, and the hindered phenol antioxidant is a basf 1076 colorless hindered phenol antioxidant. More preferably, the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester in a weight ratio of 0.8-1.2:0.4-0.8: 0.6-1.0.
The antioxidant adopted by the invention can delay or inhibit the oxidation process of the material, thereby preventing the aging of the backboard and prolonging the service life of the backboard.
Preferably, each part of the light stabilizer is at least one of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer. Further, the benzotriazole light stabilizer is produced by Shanghai Hai-Bio-technology Limited, and the hindered amine light stabilizer is 783 produced by Shii Rui chemical Limited in Shanghai. More preferably, the light stabilizer is a mixture of 2, 4-dihydroxybenzophenone, a benzotriazole-based light stabilizer, octyl triazone and a hindered amine-based light stabilizer in a weight ratio of 0.1 to 0.5:0.8 to 1.2:0.4 to 0.8:0.6 to 1.0.
The stabilizing agent adopted by the invention can delay or inhibit the ultraviolet light damage process of the material, thereby preventing the back plate from yellowing and aging and prolonging the service life of the back plate.
Preferably, each part of the processing aid is at least one of zinc stearate, calcium stearate, magnesium stearate, stearic acid, paraffin wax and PE wax; more preferably, the processing aid is a mixture of zinc stearate, stearic acid and PE wax in a weight ratio of 0.4-0.8:0.8-1.2: 0.6-1.0.
The processing aid has excellent external lubricity and strong internal lubrication effect, can improve the production efficiency of film processing, has good moisture resistance at normal temperature, strong chemical resistance and excellent electrical property, and can improve the appearance of a finished product.
Preferably, the weather-resistant layer is a composite film consisting of at least two films of a PVF film, a PVDF film, a PI film and a reinforced PET film, and the thickness of the composite film is 15-350 μm.
More preferably, the composite film comprises a surface weather-resistant layer and an inner weather-resistant layer attached to the lower surface of the surface weather-resistant layer, wherein the surface weather-resistant layer is any one of a PVF film, a PVDF film and a PI film with the thickness of 15-150 μm; the inner weather-resistant layer is a reinforced PET film with the thickness of 100-250 mu m, and the composite film is prepared by coextrusion casting, film blowing, film spraying or compounding of interlayer adhesives.
The PVF film and the PVDF film are both fluorine-containing or fluorocarbon copolymer films, and have higher chemical bonding force and structural stability compared with any other polymer, so that the PVF film or the PVDF film can not react with pollution factors in the atmosphere, and can not be damaged even by a solvent with strong corrosion capacity; the PI film is formed by polycondensation, casting and film forming of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (DDE) in a strong polar solvent and imidization, is generally insoluble in organic solvents, corrosion resistant and hydrolysis resistant, so that the surface of the back plate can be protected from fading or embrittlement easily; the composite film is prepared by coextrusion casting, film blowing, film pouring or compounding of interlayer adhesives, and can improve the corresponding properties of a PVF film, a PVDF film, a PI film or a PET film.
Preferably, the bonding layer is any one of a polyurethane adhesive layer, a polyester adhesive layer, an acrylic adhesive layer, a chloroprene rubber adhesive layer and an epoxy resin adhesive layer; the thickness of the adhesive layer is 5-20 μm.
The adhesive layer maintains excellent adhesive property, and can meet the all-weather application requirement of the photovoltaic back panel.
The invention also provides a preparation method of the black solar cell backboard with high reflectivity, which comprises the following steps:
1) preparing a black functional master batch: mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent uniformly according to the parts by weight, and then extruding at the temperature of 100-250 ℃ by adopting a screw extruder to prepare black functional master batch;
2) preparing a black reflecting layer film: mixing and stirring the black functional master batch prepared in the step 1) with the first polyolefin resin and the first adhesive resin uniformly, and preparing a film at the temperature of 100-250 ℃ by adopting an extrusion casting method or a blow molding method;
3) preparation of the back sheet: coating an adhesive layer on the inner surface of the weather-resistant layer, attaching the surface coated with the adhesive layer to the black reflecting layer film prepared in the step 2), and curing at 50-110 ℃ for 1-5 days to obtain the black solar cell backboard with high reflectivity.
The black solar cell back plate is prepared by the method, the method is simple and efficient, the operation and the control are convenient, the quality of the produced product is high, the industrial production is facilitated, meanwhile, the prepared back plate has a high-reflectivity effect of 25-80% on near infrared light with the wavelength of 700-1100nm, the near infrared light can be reflected to crystalline silicon, and the absorption and conversion efficiency of a solar module on solar spectrum is improved.
The invention has the beneficial effects that: according to the invention, the black color is prepared by superposing and blending the ternary color pigment in the black reflecting layer of the inner layer of the back plate, the prepared back plate has a high reflectivity effect of 25-80% for near infrared light with a wavelength of 700-1100nm, the near infrared light can be reflected to crystal silicon, and the absorption and conversion efficiency of the solar module on solar spectrum is improved; in addition, the antioxidant and the light stabilizer can delay or inhibit the oxidation process of the material, thereby preventing the aging of the film and prolonging the service life of the film; the processing aid has excellent external lubricity and strong internal lubrication effect, can improve the production efficiency of film processing, has good moisture resistance at normal temperature, strong chemical resistance and excellent electrical property, and can improve the appearance of a finished product.
The preparation method of the black solar cell backboard with high reflectivity is simple and efficient, is convenient to operate and control, has high product quality, is beneficial to industrial production, has a high reflectivity effect of 25-80% on near infrared light with a wavelength of 700 plus 1100nm, can reflect the near infrared light to crystal silicon, and improves the absorption and conversion efficiency of a solar module on solar spectrum.
Drawings
FIG. 1 is a schematic structural diagram of a black solar cell back sheet according to the present invention;
FIG. 2 is a schematic view of the weathering layer structure of the present invention;
fig. 3 is a reflectance test spectrum of the black reflective layer of the present invention.
The reference signs are: 1-weather-resistant layer, 11-surface weather-resistant layer, 12-inner-surface weather-resistant layer, 2-adhesive layer and 3-black reflecting layer.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying fig. 1-3, which are not intended to limit the present invention.
Example 1
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 20 micrometers, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
15 parts of first adhesive resin
10 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
Second adhesive resin 5 parts
And 40 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 0.8:0.6: 0.4.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 0.8:0.6: 0.4.
Each part of the first adhesive resin is an ethylene-unsaturated ester copolymer; each part of the second adhesive resin is ethylene-unsaturated ester copolymer; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 15%, and the ethylene-unsaturated ester copolymer is EAA 3004.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is anthraquinone red; each part of the pigment yellow is nickel nitrogen yellow; each part of the pigment blue is phthalocyanine blue.
Each part of the nano rare earth oxide is LnVO4:Ln3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 0.8:0.4: 0.6.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.1:0.8:0.4: 0.6.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.4:0.8: 0.6.
The thickness of the weather-resistant layer 1 is 15 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVF film with the thickness of 15 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 100 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyurethane adhesive layer, and the thickness of the bonding layer 2 is 5 micrometers.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at the temperature of 100 ℃ by adopting a screw extruder to prepare black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at the temperature of 100 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing at 50 ℃ for 1 day to obtain the black solar cell backboard with high reflectivity.
Example 2
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 102 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
38 parts of first polyolefin resin
33 parts of first adhesive resin
13 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
10 parts of second polyolefin resin
10 parts of second adhesive resin
And 54 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 0.9:0.7: 0.5.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 0.9:0.7: 0.5.
Each part of the first adhesive resin is polyvinyl butyral; each part of the second adhesive resin is polyvinyl butyral.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each portion of the pigment red is a quinacridone red; each part of the pigment yellow is fluorescent yellow; each part of the pigment blue is cobalt blue.
Each part of the nano rare earth oxide is SmVO4:Ln3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 0.9:0.5: 0.7.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.2:0.9:0.5: 0.7.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.5:0.9: 0.7.
The thickness of the weather-resistant layer 1 is 100 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVDF film with the thickness of 49 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 132 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyester adhesive layer, and the thickness of the bonding layer 2 is 8 μm.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at 136 ℃ by using a screw extruder to prepare a black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at 136 ℃ by adopting a blow molding method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing for 2 days at the temperature of 65 ℃ to obtain the black solar cell backboard with high reflectivity.
Example 3
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 185 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
55 parts of first polyolefin resin
51 parts of first adhesive resin
17 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
15 parts of second adhesive resin
And 65 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and an ethylene-propylene copolymer in a weight ratio of 1.0:0.8: 0.6.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.0:0.8: 0.6.
Each part of the first adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 1: 1; each part of the second adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 1: 1; more preferably, the ethylene-unsaturated ester copolymer contains 50% unsaturated esters based on the ethylene-unsaturated ester copolymer, and the ethylene-unsaturated ester copolymer is EMAA PC100 produced by dupont, usa.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is perylene red; each part of the pigment yellow is Napelese yellow; each part of the pigment blue is iron blue.
Each part of the nano rare earth oxide is DyVO4:Ln3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.0:0.6: 0.8.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.3:1.0:0.6: 0.8.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.6:1.0: 0.8.
The thickness of the weather-resistant layer 1 is 190 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PI film with the thickness of 83 μm; the inner weather-resistant layer 12 is a reinforced PET film with the thickness of 175 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is an acrylic adhesive layer, and the thickness of the bonding layer 2 is 12 μm.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding the mixture at the temperature of 175 ℃ by using a screw extruder to prepare black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at 175 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing at 80 ℃ for 3 days to obtain the black solar cell backboard with high reflectivity.
Example 4
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 267 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
73 parts of first polyolefin resin
69 parts of first adhesive resin
21 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
20 parts of second adhesive resin
79 parts of black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and an ethylene-propylene copolymer in a weight ratio of 1.1:0.9: 0.7.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.1:0.9: 0.7.
Each part of the first adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 0.8: 1.0; each part of the second adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 1.0: 0.8; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 67%, and further the ethylene-unsaturated ester copolymer is EMA1335AC manufactured by dupont, usa.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is azo red; each part of the pigment yellow is cobalt yellow; each portion of the pigment blue is ultramarine.
Each part of the nano rare earth oxide is EuVO4:Ln3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.1:0.6: 0.8.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.3:1.0:0.7: 0.8.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.7:1.1: 0.9.
The thickness of the weather-resistant layer 1 is 270 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVF film with the thickness of 117 μm; the inner weather-resistant layer 12 is a reinforced PET film with the thickness of 207 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a neoprene adhesive layer, and the thickness of the bonding layer 2 is 16 mu m.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at 211 ℃ by using a screw extruder to prepare a black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at 211 ℃ by adopting a blow molding method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing for 4 days at the temperature of 95 ℃ to obtain the black solar cell backboard with high reflectivity.
Example 5
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 350 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
first polyolefin resin 90 parts
90 parts of first adhesive resin
25 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
25 parts of second adhesive resin
And 90 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 1.2:1.0: 0.8.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.2:1.0: 0.8.
Each part of the first adhesive resin is an ethylene-unsaturated ester copolymer; each part of the second adhesive resin is ethylene-unsaturated ester copolymer; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 85%, and further the ethylene-unsaturated ester copolymer is EMMA20B manufactured by DuPont, U.S.A.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is molybdenum chromium red; each part of the pigment yellow is cadmium yellow; each part of the pigment blue is phthalocyanine blue.
Each part of the nano rare earth oxide is GdVO4:Eu3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.2:0.8: 1.0.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.5:1.2:0.8: 1.0.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.8:1.2: 1.0.
The thickness of the weather-resistant layer 1 is 350 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVDF film with the thickness of 150 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 250 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyepoxy resin adhesive layer, and the thickness of the bonding layer 2 is 20 micrometers.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at the temperature of 250 ℃ by using a screw extruder to prepare a black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at the temperature of 250 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing for 5 days at the temperature of 110 ℃ to obtain the black solar cell backboard with high reflectivity.
Example 6
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 350 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
first polyolefin resin 90 parts
90 parts of first adhesive resin
25 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
25 parts of second adhesive resin
And 90 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 1.2:1.0: 0.8.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.2:1.0: 0.8.
Each part of the first adhesive resin is an ethylene-unsaturated ester copolymer; each part of the second adhesive resin is ethylene-unsaturated ester copolymer; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 85%, and further the ethylene-unsaturated ester copolymer is EMMA20B manufactured by DuPont, U.S.A.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is iron red; each part of the pigment yellow is aryl yellow; each part of the pigment blue is cobalt blue.
Each part of the nano rare earth oxide is Gd2O3:Eu3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.2:0.8: 1.0.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.5:1.2:0.8: 1.0.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.8:1.2: 1.0.
The thickness of the weather-resistant layer 1 is 350 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVDF film with the thickness of 150 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 250 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyepoxy resin adhesive layer, and the thickness of the bonding layer 2 is 20 micrometers.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at the temperature of 250 ℃ by using a screw extruder to prepare a black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at the temperature of 250 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing for 5 days at the temperature of 110 ℃ to obtain the black solar cell backboard with high reflectivity.
Comparative example 1
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 20 micrometers, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
15 parts of first adhesive resin
10 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
Second adhesive resin 5 parts
And 40 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 0.8:0.6: 0.4.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 0.8:0.6: 0.4.
Each part of the first adhesive resin is an ethylene-unsaturated ester copolymer; each part of the second adhesive resin is ethylene-unsaturated ester copolymer; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 15%, and the ethylene-unsaturated ester copolymer is EAA 3004.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 0.8:0.4: 0.6.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.1:0.8:0.4: 0.6.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.4:0.8: 0.6.
The thickness of the weather-resistant layer 1 is 15 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PVF film with the thickness of 15 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 100 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyurethane adhesive layer, and the thickness of the bonding layer 2 is 5 micrometers.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at the temperature of 100 ℃ by adopting a screw extruder to prepare black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at the temperature of 100 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing at 50 ℃ for 1 day to obtain the black solar cell backboard with high reflectivity.
Comparative example 2
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 185 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
55 parts of first polyolefin resin
51 parts of first adhesive resin
17 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
15 parts of second adhesive resin
And 65 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and an ethylene-propylene copolymer in a weight ratio of 1.0:0.8: 0.6.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.0:0.8: 0.6.
Each part of the first adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 1: 1; each part of the second adhesive resin is a mixture of ethylene-unsaturated ester copolymer and polyvinyl butyral according to the weight ratio of 1: 1; more preferably, the ethylene-unsaturated ester copolymer contains 50% unsaturated esters based on the ethylene-unsaturated ester copolymer, and the ethylene-unsaturated ester copolymer is EMAA PC100 produced by dupont, usa.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
each part of the black functional filler comprises the following raw materials in parts by weight:
50 portions of pigment red
50 portions of pigment yellow
50 parts of pigment blue.
Each part of the pigment red is perylene red; each part of the pigment yellow is Napelese yellow; each part of the pigment blue is iron blue.
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.0:0.6: 0.8.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.3:1.0:0.6: 0.8.
Each part of the processing aid is a mixture of zinc stearate, stearic acid and PE wax according to the weight ratio of 0.6:1.0: 0.8.
The thickness of the weather-resistant layer 1 is 190 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PI film with the thickness of 83 μm; the inner weather-resistant layer 12 is a reinforced PET film with the thickness of 175 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is an acrylic adhesive layer, and the thickness of the bonding layer 2 is 12 μm.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding the mixture at the temperature of 175 ℃ by using a screw extruder to prepare black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at 175 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing at 80 ℃ for 3 days to obtain the black solar cell backboard with high reflectivity.
Comparative example 3
The high-reflectivity black solar cell backboard comprises a weather-resistant layer 1, an adhesive layer 2 and a black reflecting layer 3 which are sequentially arranged from top to bottom, wherein the thickness of the black reflecting layer 3 is 350 mu m, and the black reflecting layer 3 comprises the following raw materials in parts by weight:
first polyolefin resin 90 parts
90 parts of first adhesive resin
25 parts of black functional master batch.
Each part of the black functional master batch comprises the following raw materials in parts by weight:
25 parts of second adhesive resin
And 90 parts of a black auxiliary agent.
Each part of the first polyolefin resin is a mixture of polyethylene, crosslinked polyethylene and ethylene-propylene copolymer in a weight ratio of 1.2:1.0: 0.8.
Each part of the second polyolefin resin is a mixture of polyethylene, chlorinated polyethylene and ethylene-propylene copolymer according to the weight ratio of 1.2:1.0: 0.8.
Each part of the first adhesive resin is an ethylene-unsaturated ester copolymer; each part of the second adhesive resin is ethylene-unsaturated ester copolymer; more preferably, the ethylene-unsaturated ester copolymer has a molar ratio of unsaturated ester to ethylene-unsaturated ester copolymer of 85%, and further the ethylene-unsaturated ester copolymer is EMMA20B manufactured by DuPont, U.S.A.
Each part of the black auxiliary agent comprises the following raw materials in parts by weight:
80 portions of black functional filler
2 portions of antioxidant
2 parts of light stabilizer.
Each part of the black functional filler comprises the following raw materials in parts by weight:
each part of the pigment red is molybdenum chromium red; each part of the pigment yellow is cadmium yellow; each part of the pigment blue is phthalocyanine blue.
Each part of the nano rare earth oxide is GdVO4:Eu3+。
Each part of the antioxidant is a mixture of diphenylamine, a Pasteur 1076 colorless hindered phenol antioxidant and thiodipropionic acid diester according to the weight ratio of 1.2:0.8: 1.0.
Each part of the light stabilizer is a mixture of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer according to the weight ratio of 0.5:1.2:0.8: 1.0.
The thickness of the weather-resistant layer 1 is 350 mu m; more preferably, the weather-resistant layer 1 comprises a surface weather-resistant layer 11 and an inner face weather-resistant layer 12 attached to the lower surface of the surface weather-resistant layer 11, wherein the surface weather-resistant layer 11 is a PE film with the thickness of 150 μm; the inner surface weather-resistant layer 12 is a reinforced PET film with the thickness of 250 mu m, the reinforced PET film is produced by Enno packaging materials Co., Ltd, Taizhou, and the weather-resistant layer 1 is prepared by co-extrusion casting, film blowing, film pouring or compounding of interlayer adhesive.
The bonding layer 2 is a polyepoxy resin adhesive layer, and the thickness of the bonding layer 2 is 20 micrometers.
The preparation method of the black solar cell backboard with high reflectivity comprises the following steps:
1) preparing a black functional master batch: uniformly mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent in parts by weight, and then extruding at the temperature of 250 ℃ by using a screw extruder to prepare a black functional master batch;
2) preparation of black reflective layer 3 film: mixing and stirring the black functional master batch prepared in the step 1) with first polyolefin resin and first adhesive resin uniformly, and preparing a film at the temperature of 250 ℃ by adopting an extrusion casting method;
3) preparation of the back sheet: coating an adhesive layer 2 on the inner surface of the weather-resistant layer 1, adhering the surface coated with the adhesive layer 2 to the black reflecting layer 3 film prepared in the step 2), and curing for 5 days at the temperature of 110 ℃ to obtain the black solar cell backboard with high reflectivity.
The black reflective layers 3 obtained in examples 1 to 6 and comparative examples 1 to 3 were subjected to reflectance (GJB 5023.12003), humid heat aging (GB/T2423.3-2006), and water vapor transmission rate (GB/T21529-. The results are shown in table 1:
TABLE 1
| Item | Reflectivity/%) | Humid heat aging for 2000h | Water vapor transmission rate g/m2·dag |
| Example 1 | 52.55 | △b＜2 | 1.3 |
| Example 2 | 59.71 | △b＜2 | 1.2 |
| Example 3 | 61.99 | △b＜2 | 1.1 |
| Example 4 | 49.63 | △b＜2 | 1.3 |
| Example 5 | 46.51 | △b＜2 | 1.2 |
| Example 6 | 28.66 | △b＜2 | 1.3 |
| Comparative example 1 | 12.52 | △b＜2 | 1.7 |
| Comparative example 2 | 18.52 | △b＜2 | 1.6 |
| Comparative example 3 | 22.59 | △b＜2 | 2.0 |
As can be seen from the above table, the black reflective layers 3 prepared in embodiments 1 to 6 of the present invention have high reflectivity and low water vapor transmittance, and have the characteristics of good resistance to damp-heat aging, and in addition, have the advantages of long service life and low production cost.
Compared with the embodiment 1, in the comparative example 1, the black mica powder is used for replacing the black functional filler when the black reflecting layer 3 is prepared, and various physical property tests are carried out on the black reflecting layer 3 prepared by using the raw materials, and the analysis shows that the reflectivity of the black reflecting layer 3 is obviously reduced, and the water vapor transmittance is relatively increased; the black functional filler is added into the raw materials of the black auxiliary agent, so that the prepared black reflecting layer 3 has high reflectivity and low water vapor transmittance, and has the characteristics of good damp-heat aging resistance, long service life and low production cost.
Compared with the embodiment 3, in the comparative example 2, the nano rare earth oxide is not added when the black reflecting layer 3 is prepared, and various physical property tests are carried out on the black reflecting layer 3 prepared by using the raw materials, and analysis shows that the reflectivity of the black reflecting layer 3 is relatively reduced, and the water vapor transmittance is relatively increased; the invention shows that the black reflecting layer 3 prepared by adding the nano rare earth oxide into the raw material of the black auxiliary agent has high reflectivity and low water vapor transmittance, and simultaneously has the characteristics of good damp-heat aging resistance, long service life and low production cost.
Compared with the embodiment 5, in the comparative example 3, no processing aid is added when the black reflecting layer 3 used for the back plate is prepared, and various physical property tests are carried out on the black reflecting layer 3 prepared by using the raw materials, and analysis shows that the reflectivity of the black reflecting layer 3 is relatively reduced, and the water vapor transmittance is relatively increased; the processing aid is added into the raw materials of the black aid, so that the prepared black reflecting layer 3 has high reflectivity and low water vapor transmittance, and has the characteristics of good damp-heat aging resistance, long service life and low production cost.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. A high-reflectivity black solar cell backsheet is characterized in that: the weather-resistant coating comprises a weather-resistant layer, an adhesive layer and a black reflecting layer which are sequentially arranged from top to bottom, wherein the black reflecting layer comprises the following raw materials in parts by weight:
20-90 parts of first polyolefin resin
15-90 parts of first adhesive resin
10-25 parts of black functional master batch.
2. The high reflectance black solar cell backsheet according to claim 1, wherein: each part of the black functional master batch comprises the following raw materials in parts by weight:
5-25 parts of second polyolefin resin
5-25 parts of second adhesive resin
40-90 parts of black auxiliary agent.
3. The high reflectance black solar cell backsheet according to claim 2, wherein: each part of the first polyolefin resin is at least one of polyethylene, chlorinated polyethylene, crosslinked polyethylene, ethylene-propylene copolymer, ethylene-butylene copolymer, ethylene-octene copolymer, ethylene-cycloolefin copolymer and polypropylene; each part of the second polyolefin resin is at least one of polyethylene, chlorinated polyethylene, cross-linked polyethylene, ethylene-propylene copolymer, ethylene-butylene copolymer, ethylene-octene copolymer, ethylene-cycloolefin copolymer and polypropylene.
4. The high reflectance black solar cell backsheet according to claim 2, wherein: each part of the first adhesive resin is an ethylene-unsaturated ester copolymer and/or polyvinyl butyral; each part of the second adhesive resin is an ethylene-unsaturated ester copolymer and/or polyvinyl butyral.
5. The high reflectance black solar cell backsheet according to claim 2, wherein: each part of the black auxiliary agent comprises the following raw materials in parts by weight:
6. the black solar cell backsheet according to claim 5, wherein: each part of the black functional filler comprises the following raw materials in parts by weight:
7. the black solar cell backsheet according to claim 6, wherein: the pigment red is at least one of iron red, molybdenum chromium red, azo red, perylene red, quinacridone red and anthraquinone red; the pigment yellow is at least one of aryl yellow, cadmium yellow, cobalt yellow, Napellus yellow, fluorescent yellow, nickel titanium yellow, pyrimidine yellow, isoindolinone yellow, quinacridone yellow, nickel nitrogen yellow and benzimidazolone yellow; the pigment blue is at least one of cobalt blue, phthalocyanine blue, ultramarine and iron blue; the nano rare earth oxide is Gd2O3:Eu3+Or GdVO4:Eu3+Or XVO4:Ln3+And X is at least one of Ln, Eu, Dy, Sm and Er.
8. The black solar cell backsheet according to claim 5, wherein: each part of the antioxidant is at least one of aromatic amine antioxidant, hindered phenol antioxidant, triphenyl phosphite and thiodipropionic acid diester; the light stabilizer is at least one of 2, 4-dihydroxy benzophenone, benzotriazole light stabilizer, octyl triazone and hindered amine light stabilizer; the processing aid is at least one of zinc stearate, calcium stearate, magnesium stearate, stearic acid, paraffin and PE wax.
9. The high reflectance black solar cell backsheet according to claim 1, wherein: the weather-resistant layer is a composite film consisting of at least two films of a PVF film, a PVDF film, a PI film and a reinforced PET film; the bonding layer is any one of a polyurethane adhesive layer, a polyester adhesive layer, an acrylic adhesive layer, a chloroprene rubber adhesive layer and an epoxy resin adhesive layer.
10. A method for preparing the high-reflectance black solar cell back sheet according to any one of claims 1 to 9, wherein: the method comprises the following steps:
1) preparing a black functional master batch: mixing and stirring the second polyolefin resin, the second adhesive resin and the black auxiliary agent uniformly according to the parts by weight, and then extruding at the temperature of 100-250 ℃ by adopting a screw extruder to prepare black functional master batch;
2) preparing a black reflecting layer film: mixing and stirring the black functional master batch prepared in the step 1) with the first polyolefin resin and the first adhesive resin uniformly, and preparing a film at the temperature of 100-250 ℃ by adopting an extrusion casting method or a blow molding method;
3) preparation of the back sheet: coating an adhesive layer on the inner surface of the weather-resistant layer, attaching the surface coated with the adhesive layer to the black reflecting layer film prepared in the step 2), and curing at 50-110 ℃ for 1-5 days to obtain the black solar cell backboard with high reflectivity.
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