CN209963070U - Solar backboard and solar cell module comprising same - Google Patents

Solar backboard and solar cell module comprising same Download PDF

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Publication number
CN209963070U
CN209963070U CN201920841649.4U CN201920841649U CN209963070U CN 209963070 U CN209963070 U CN 209963070U CN 201920841649 U CN201920841649 U CN 201920841649U CN 209963070 U CN209963070 U CN 209963070U
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layer
weight
resistant layer
parts
solar
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王朝栋
梁明礼
周俊宏
叶昆明
王畅
罗定彬
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Hangzhou Yongxinyang Photoelectric Material Co Ltd
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Hangzhou Yongxinyang Photoelectric Material Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Laminated Bodies (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The present application relates to a solar back sheet and a solar cell module including the same. The solar back sheet includes: a hydrolysis-resistant layer comprising a first surface and a second surface opposite the first surface; a first weathering layer disposed on the first surface; and a second weathering layer disposed on the second surface. This application is through setting up first resistant layer in order to replace fluorine-containing coating in the solar energy backplate, under the situation that has reduced fluoropolymer's use amount, and then ensures that solar energy backplate's weatherability promotes.

Description

Solar backboard and solar cell module comprising same
Technical Field
The application relates to the technical field of solar cell modules, in particular to a solar backboard.
Background
The following description and examples are not admitted to be prior art by virtue of their inclusion in this section.
Because of the increasing importance of environmental protection issues related to energy sources, such as energy shortage, greenhouse gas emission, etc., the development and application of renewable and alternative energy sources (such as solar energy) have been actively promoted and implemented by various developing countries, and especially solar power generation is most important by various countries.
A solar cell module generally includes a front sheet, an encapsulant layer, a solar cell unit encapsulated in the encapsulant layer, and a solar back sheet. The solar back sheet functions to support and protect the solar cell module, to isolate the solar cell module from environmental or weather damage and corrosion, and to provide the solar cell unit with certain electrical insulation properties.
Currently, solar back sheets are generally prepared by coating a fluorine-containing resin layer on both sides of a polyethylene terephthalate (PET) substrate or attaching a film adhesive layer composed of a fluorine-containing polymer. Since fluorine in the fluoropolymer is relatively difficult to degrade, serious environmental pollution is easily caused during recovery. With the environmental requirements and the rising environmental costs, further improvements are needed in solar back panels.
SUMMERY OF THE UTILITY MODEL
It is an object of embodiments of the present application to provide a solar back sheet that attempts to solve at least some of the problems presented in the related art.
Some embodiments of the present application provide a solar back sheet, comprising: hydrolysis-resistant layer, first resistant layer of waiting and second resistant layer of waiting. The hydrolysis-resistant layer comprises a first surface and a second surface opposite to the first surface, the first weather-resistant layer is arranged on the first surface, and the second weather-resistant layer is arranged on the second surface.
According to some embodiments of the present application, the hydrolysis-resistant layer has a thickness of about 100 μm to about 500 μm. In some embodiments of the present application, the hydrolysis-resistant layer has a thickness of about 150 μm to about 400 μm.
According to some embodiments of the present application, the first weathering layer has a thickness of from about 10 μm to about 70 μm. In some embodiments of the present application, the first weathering layer has a thickness of from about 15 μm to about 60 μm.
According to some embodiments of the present application, the second weathering layer has a thickness of from about 2 μm to about 20 μm.
According to some embodiments of the present application, the first weathering layer includes a polyester resin, an anti-hydrolysis agent, and TiO2The hydrolysis resistant agent comprises a carbodiimide, a polycarbodiimide, a carbodiimide grafted polymer, or a combination thereof.
According to some embodiments of the present application, the hydrolysis resistant agent is present in the first weathering layer in an amount of 1 to 10 parts by weight, and the TiO in the first weathering layer is present in the first weathering layer in an amount of 100 parts by weight based on the total weight of the first weathering layer2Is contained in an amount of 10 to 50 parts by weight.
According to some embodiments of the present application, the hydrolysis-resistant layer includes the polyester resin and the hydrolysis-resistant agent, and a content of the hydrolysis-resistant agent in the hydrolysis-resistant layer is 0.2 to 2 parts by weight based on 100 parts by weight of a total weight of the hydrolysis-resistant layer.
According to some embodiments of the present application, the second weathering layer comprises a resin selected from the group consisting of fluorocarbon resins, aqueous urethane resins, saturated polyester resins, hydroxy acrylic resins, and combinations thereof.
In some embodiments of the present application, the polyester resin package is selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polymethyl methacrylate (PMMA), polyhydroxybutyrate valerate (PHBV), polytrimethylene terephthalate (PTT), polyethylene glycol succinate (PES), polybutylene succinate (PBS), polyethylene naphthalate (PEN), and combinations thereof.
According to some embodiments of the present application, the solar back sheet further comprises a protective layer.
According to some embodiments of the present application, the first weathering layer further includes a UV stabilizer, a UV absorber, and a toughening agent. In some embodiments, the UV absorbers include, but are not limited to, benzotriazoles (benzotriazoles), benzotriazines (benzotriazines), benzophenones (benzophenones), salicylic acid derivatives (salicylic acids) and combinations thereof.
Some embodiments of the present application provide a solar cell module, which sequentially comprises a front sheet, a sealing material layer, and the solar back sheet of the above embodiments, wherein the sealing material layer comprises one or more solar cells, and the second weather-resistant layer is attached to the sealing material layer.
Drawings
Drawings necessary for describing embodiments of the present application or the prior art will be briefly described below in order to describe the embodiments of the present application. It should be noted that the drawings in the following description are merely some embodiments in the present application, various structures thereof may not be drawn to scale, and the sizes of the various structures may be arbitrarily increased or decreased for clarity of discussion. It will be apparent to those skilled in the art that other embodiments of the drawings can be obtained from the structures illustrated in these drawings without the need for inventive work.
Fig. 1 is a schematic structural view of a solar back sheet provided according to some embodiments of the present application.
Fig. 2 is a schematic structural diagram of a solar cell module provided according to some embodiments of the present application.
Detailed Description
Embodiments of the present application will be described in detail below. Throughout the specification, the same or similar components and components having the same or similar functions are denoted by like reference numerals. The embodiments described herein with respect to the figures are illustrative in nature, are diagrammatic in nature, and are used to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.
In this specification, unless specified or limited otherwise, relative terms such as: terms of "central," "longitudinal," "lateral," "front," "rear," "right," "left," "inner," "outer," "lower," "upper," "horizontal," "vertical," "above," "below," "top," "bottom," and derivatives thereof (e.g., "horizontally," "downwardly," "upwardly," etc.) should be construed to refer to the orientation as then described in the discussion or as shown in the drawing figures. These relative terms are for convenience of description only and do not require that the present application be constructed or operated in a particular orientation.
As used herein, the terms "substantially", "substantially" and "about" are used to describe and illustrate minor variations. When used in conjunction with an event or circumstance, the terms can refer to instances where the event or circumstance occurs precisely as well as instances where the event or circumstance occurs in close proximity. For example, when used in conjunction with numerical values, the term can refer to a range of variation that is less than or equal to ± 10% of the stated numerical value, such as less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%. For example, two numerical values are considered to be "substantially" identical if the difference between the two numerical values is less than or equal to ± 10% (e.g., less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%) of the mean of the values.
Additionally, amounts, ratios, and other numerical values are sometimes presented herein in a range format. It is to be understood that such range format is used for convenience and brevity, and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited.
Moreover, for convenience in description, "first," "second," "third," etc. may be used herein to distinguish between different elements of a figure or series of figures. Unless specifically specified or limited, "first," "second," "third," and the like are not intended to describe corresponding components.
The embodiment of the application provides a novel solar backboard, solar backboard has three layer construction, and it has contained first resistant layer, the resistant layer of hydrolysising between two-layer resistant layer of waiting, wherein this application is through using first resistant layer to replace fluorine-containing coating layer, can effectively reduce the fluorine content in the solar backboard and maintain its weatherability. The embodiments of the present application will be further described with reference to the drawings attached to the specification.
Fig. 1 is a schematic structural view of a solar back sheet provided according to some embodiments of the present application.
As shown in fig. 1, the solar back sheet provided in the embodiment of the present application includes a hydrolysis-resistant layer 11, a first weather-resistant layer 12, and a second weather-resistant layer 13. The hydrolysis-resistant layer 11 includes a first surface and a second surface opposite to the first surface, wherein the first weather-resistant layer 12 is disposed on the first surface, and the second weather-resistant layer 13 is disposed on the second surface. The dimensions of the hydrolysis-resistant layer 11, the first weather-resistant layer 12 and the second weather-resistant layer 13 in fig. 1 are only schematic structural diagrams for showing the relative dimensions and arrangement thereof, and it should be clearly understood by those skilled in the art that the actual dimensions of the hydrolysis-resistant layer 11, the first weather-resistant layer 12 and the second weather-resistant layer 13 can be adjusted to meet the requirements of practical applications without being limited thereto.
In some embodiments of the present application, the thickness of the second weather-resistant layer 13 is about 2 μm to about 20 μm, such as 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 12 μm, 14 μm, 15 μm, 16 μm, 18 μm or 20 μm, when the thickness of the second weather-resistant layer 13 is greater than 20 μm, the weather resistance of the solar back sheet is limited, the increase in thickness cannot further increase the weather resistance of the solar back sheet, is not cost-effective, the fluorine content in the product can increase, and the adhesion between the second weather-resistant layer 12 and the hydrolysis-resistant layer 11 can decrease, thereby causing peeling of the solar back sheet in the solar cell module. In contrast, when the thickness of the second weather-resistant layer 13 is small by 2 μm, the solar back sheet is poor in weather resistance.
In some embodiments of the present application, the hydrolysis-resistant layer 11 has a thickness of about 100 μm to about 500 μm, such as 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm or 500 μm, and the hydrolysis-resistant layer 11 can provide certain structural strength and weather resistance within the above thickness range. In other embodiments of the present application, the hydrolysis-resistant layer 11 has a thickness of about 150 μm to about 400 μm.
In some embodiments of the present application, the first weathering layer 12 has a thickness of about 10 μm to about 70 μm, such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm or 70 μm, and the first weathering layer 12 has good weatherability and sufficient adherence to the hydrolysis resistant layer within the thickness ranges described above. In other embodiments of the present application, the first weathering layer 12 has a thickness of from about 15 μm to about 60 μm.
In some embodiments of the present application, the first weathering layer 12 is a modified polyester resin layer having weathering resistance. The first weathering layer 12 includes: (a) a polyester resin (polyester resin), (b) an anti-hydrolysis agent, and (c) titanium dioxide (TiO)2) Wherein the titanium dioxide includes, but is not limited to, rutile type structure, anatase type structure and brookite type structure, and the hydrolysis resistance agent comprises carbodiimide, polycarbodiimide, carbodiimideGraft polymers, or combinations thereof. By modifying the polyester resin with the hydrolysis resistant agent and adding the titanium dioxide, the obtained modified polyester resin layer has good weather resistance, and has UV resistance and hydrolysis resistance.
The carbodiimide refers to a compound having the formula R-N ═ C ═ N-R '(where R and R' are each independently H or an organic group), including, but not limited to, carbodiimide, bis (2, 6-diisopropylphenyl) carbodiimide, and bis (4- (1-methyl-phenylethyl) 2, 6-diisopropylphenyl) carbodiimide. The polycarbodiimide and the carbodiimide graft polymer are polymers or graft polymers obtained by polymerizing the above-mentioned carbodiimide.
In some embodiments of the present application, commercially available polycarbodiimide and carbodiimide grafted polymers include, but are not limited to, STABOXOL-1 (Rhein chemistry), STABOXOL-P100 (Rhein chemistry), and STABOXOL-P200 (Rhein chemistry).
In some embodiments herein, component (b) is present in the first weathering layer 12 in an amount of from about 1 to about 10 parts by weight, such as 1 part by weight, 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, based on 100 parts by weight of the total first weathering layer.
In some embodiments herein, component (c) is present in the first weathering layer 12 in an amount of about 10 to about 50 parts by weight, such as 10, 15, 20, 25, 30, 35, 40, 45 or 50 parts by weight, based on 100 parts by weight of the total first weathering layer.
In some embodiments herein, the first weathering layer 12 may optionally further include suitable additives known to those skilled in the art, such as, but not limited to, UV stabilizers, UV absorbers, tougheners. Wherein the UV stabilizer and the UV absorber can be added in an amount of about 1 to about 5 parts by weight, based on 100 parts by weight of the total weight of the first weathering layer 12; the toughening agent includes, but is not limited to, thermoplastic polyester elastomer (TPEE), and the toughening agent can be added in an amount of about 1 part by weight to about 10 parts by weight.
In some embodiments of the present application, the hydrolysis-resistant layer 11 is a modified polyester resin layer with hydrolysis resistance. The hydrolysis-resistant layer 11 includes: (a) the polyester colophony and (b) the hydrolysis-resistant agent, wherein the hydrolysis-resistant layer can modify the polyester resin by using the hydrolysis-resistant agent so as to enable the polyester resin to have hydrolysis-resistant performance. The class of anti-hydrolytic agents is characterized as described above.
In some embodiments of the present application, component (b) is present in the hydrolysis-resistant layer in an amount of about 0.2 parts by weight to about 2 parts by weight, for example 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, 0.8 parts by weight, 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, or 2 parts by weight, based on 100 parts by weight of the total weight of the hydrolysis-resistant layer.
In some embodiments of the present application, the hydrolysis-resistant layer 11 can optionally further include suitable additives known to those skilled in the art, such as, but not limited to, UV stabilizers, UV absorbers, toughening agents, titanium dioxide (TiO)2). Wherein the UV stabilizer and/or the UV absorber can be added in an amount of about 0.2 parts by weight to about 1 part by weight, based on 100 parts by weight of the total weight of the first weathering layer 12; the toughening agent can be added in an amount of about 0.2 parts by weight to about 2 parts by weight; and the titanium dioxide can be added in an amount of about 2 parts by weight to about 10 parts by weight. In some embodiments, the UV absorbers include, but are not limited to, the group consisting of benzotriazoles (benzotriazoles), benzotriazines (benzotriazines), benzophenones (benzophenones), salicylic acid derivatives (salicylic acid derivatives), and combinations thereof.
In some embodiments of the present application, the polyester resin is preferably a high temperature resistant type polyester resin, and may be selected from, but is not limited to, the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polymethyl methacrylate (PMMA), polyhydroxybutyrate valerate (PHBV), polytrimethylene terephthalate (PTT), polyethylene glycol succinate (PES), polybutylene succinate (PBS), polyethylene naphthalate (PEN), and combinations thereof, and has a molecular weight of about 20,000 to about 30,000, such as 22,000, 24,000, 25,000, 26,000, 28,000, or 30,000. The above-mentioned polyester resin is merely an exemplary example for illustrating the component (a) of the hydrolysis-resistant layer 11 and the first weather-resistant layer 12, and is not limited to the present application, and those skilled in the art can clearly understand that other suitable polyester resins in the field can be applied to the hydrolysis-resistant layer and the first weather-resistant layer of the present application through the above-mentioned exemplary example.
In some embodiments herein, the second weathering layer comprises one or more selected from the group consisting of fluorocarbon resins, aqueous urethane resins, saturated polyester resins, and hydroxyacrylic resins. The fluorocarbon resin is selected from the group consisting of fluoroolefin resins, acrylic fluorinated resins, fluoroether resins, and combinations thereof. The above-mentioned kinds of fluorocarbon resins are only exemplary examples for illustrating the material of the second weather-resistant layer 13, and are not limiting to the present application, and those skilled in the art can clearly understand that other suitable resins in the field can be applied to the second weather-resistant layer of the present application through the above-mentioned exemplary embodiments.
In some embodiments of the present application, the second weathering layer may optionally further include suitable additives known to those skilled in the art, such as, but not limited to, adhesives, hardeners, and the like. In some embodiments, the binder comprises titanium dioxide. In some embodiments, the hardener comprises: dicyclohexylmethane diisocyanate. The titanium dioxide can be added in an amount of about 2 parts by weight to about 20 parts by weight, based on 100 parts by weight of the total weight of the second weathering layer 13. The hardener can be added in an amount of about 2 parts by weight to about 20 parts by weight.
In some embodiments of the present application, the solar back sheet may be prepared by: firstly, a double-layer co-extrusion processing mode is adopted to prepare the hydrolysis-resistant layer 11 and the first weather-resistant layer 12, and then a second weather-resistant layer material coating is formed on the exposed surface of the hydrolysis-resistant layer 11 through a coating mode, wherein the coating mode comprises but is not limited to one or more of a slit coating method, a micro-gravure coating method, a squeeze coating method and a scraper coating method, and the coating thickness of the second weather-resistant layer material coating is about 3 mu m to about 40 mu m. And drying the second weather-resistant layer material coating to form a second weather-resistant layer, thereby obtaining the solar back sheet.
Fig. 2 is a schematic structural diagram of a solar cell module provided according to some embodiments of the present application. As shown in fig. 2, some embodiments of the present application provide a solar cell module, which includes a sealing material layer 21, a solar cell unit 22, a front sheet 23, and a solar back sheet provided in embodiments of the present application, wherein the solar cell unit 22 is located in the sealing material layer 21, and the solar back sheet includes a hydrolysis-resistant layer 11, a first weather-resistant layer 12, and a second weather-resistant layer 13. Wherein the solar back panel is attached to the sealing material layer 21 through the second weather-resistant layer 13. The solar cell module of the embodiment of the present application shows better and superior performance than the existing solar cell module under passing various strength and weather resistance tests, wherein the strength test includes: a tensile strength test, an elongation at break test, a partial discharge voltage test, a peel test, and a heat shrinkage test, and the weather resistance test includes: pressure-resistant aging test (PCT), resistance to wet heat aging test, and ultraviolet light pretreatment test (UV).
In some embodiments of the present application, the solar back sheet may further include a protective layer, wherein the protective layer may be disposed on the outer surface of the first weather-resistant layer 12, or may cover the peripheral side surface of the solar back sheet. Through the setting of protective layer, can further strengthen solar backplane's weatherability to avoid first resistant layer, resistant layer and the damage that probably causes when the second resistant layer receives external force striking.
The preparation of the solar back sheet in the embodiments of the present application, together with the technical advantages and features provided thereby, will be further described below in conjunction with some specific embodiments of the present application and their test results under different strength and weatherability tests. It should be understood by those skilled in the art that the following specific examples are only exemplary examples for illustrating the preparation of the solar back sheet in some of the examples of the present application, and any other suitable preparation method is within the scope of the present application without being limited thereto.
The first embodiment is as follows:
1. example 1
91.5 parts by weight of high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 8 parts by weight of titanium dioxide (TiO)2) (rutile structure) and 0.5 part by weight of polycarbodiimide (Laveny, type: M20) were uniformly mixed to form a mixture of hydrolysis-resistant layer material, and the mixture was fed into a twin-screw extruder (Bruckner, twin-screw extruder) to be pelletized to prepare colloidal particles of hydrolysis-resistant layer material.
57.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 35 parts by weight of titanium dioxide (TiO)2) (rutile type structure) and 7.5 parts by weight of polycarbodiimide were uniformly mixed to form a mixture of the first weather-resistant layer material, and the mixture was fed into a twin-screw extruder to be pelletized to prepare first weather-resistant layer material colloidal particles.
And then adding the colloidal particles of the hydrolysis-resistant layer material and the colloidal particles of the first weather-resistant layer material into two single-screw extruders respectively, wherein the extrusion temperature is 260 ℃. Leading-in to double-deck crowded membrane head department altogether of two kinds of fusants through respective runner to adjust the thickness of hydrolysising the layer with first resistant layer of waiting through control extrusion capacity, wherein the ratio of the extrusion capacity of hydrolysising the layer with first resistant layer of waiting is 6: 1. after extrusion, biaxial stretching was carried out, followed by cooling to form a PET film comprising a hydrolysis-resistant layer having a thickness of 240 μm and a first weather-resistant layer having a thickness of 40 μm.
20 parts by weight of a fluorine-containing olefin and vinyl ether copolymer fluororesin, 15 parts by weight of titanium dioxide (DUPONT, R902) and 5 parts by weight of dicyclohexylmethane diisocyanate were added to 60 parts by weight of an n-butyl acetate solvent and dissolved by stirring to obtain a fluoropolymer coating.
And coating the fluoropolymer coating on the exposed surface of the hydrolysis-resistant layer in the PET film by adopting micro-gravure coating, wherein the coating thickness of the coating is 16 mu m. The coating was then dried at 160 ℃ for 1min to form a second weatherable layer having a thickness of 8 μm on the PET film, and cut to obtain a solar back sheet having a three-layer structure.
2. Example 2
The same procedure as in example 1 was repeated, except that in example 2, 91 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 8 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 1 part by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of hydrolysis-resistant layer materials.
3. Example 3
The same procedure as in example 1 was repeated, except that in example 3, 90.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (chemical fiber, type: FG600), 8 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 1.5 parts by weight of polycarbodiimide (langey, type: M20) were mixed homogeneously to form a mixture of hydrolysis-resistant layer materials.
4. Example 4
The same procedure as in example 1 was repeated, except that in example 4, 90 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (standard chemical fiber, type: FG600), and 8 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 2 parts by weight of polycarbodiimide (langey, type: M20) were mixed homogeneously to form a mixture of hydrolysis-resistant layer materials.
5. Example 5
The same procedure as in example 3 was repeated, except that in example 5, 62.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 35 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 2.5 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
6. Example 6
Same as in example 3The same procedure as in example 6 was repeated, except that 60 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 35 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 5 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
7. Example 7
The same procedure as in example 3 was repeated, except that in example 7, 55 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (standard chemical fiber, type: FG600), and 35 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 10 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weather-resistant layer material.
8. Example 8
The same procedure as in example 3 was repeated, except that in example 8, 77.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), and 15 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 7.5 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
9. Example 9
The same procedure as in example 3 was repeated, except that in example 9, 67.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), and 25 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 7.5 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
10. Example 10
The same procedure as in example 3 was repeated, except that in example 10, 47.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 45 parts by weight of titanium dioxide (TiO) were added2) (rutile type structure) and 7.5 parts by weight of polycarbodiimide (Laveny, type: M20)To form a mixture of the first weathering layer material.
11. Example 11
The same preparation method as in example 3 was conducted except that in example 11, 98.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (chemical fiber, type: FG600) and 1.5 parts by weight of polycarbodiimide (Laveny, type: M20) were uniformly mixed to form a mixture of hydrolysis resistant layer materials.
12. Example 12
The same as in example 1 except that example 12 was conducted by changing the ratio of the extrusion amounts of the hydrolysis-resistant layer and the first weather-resistant layer to 12: 1. after extrusion, cooling was carried out to form a PET film comprising a hydrolysis-resistant layer having a thickness of 360 μm and a first weather-resistant layer having a thickness of 30 μm.
II, comparison example:
1. comparative example 1:
the same preparation method as in example 1 was conducted except that in comparative example 1, 92 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600) and 8 parts by weight of titanium dioxide (TiO) were used2) (rutile structure) to form a mixture of hydrolysis resistant layer materials.
2. Comparative example 2:
the same preparation method as in example 1 was conducted except that in comparative example 2, 89 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 8 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 3 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of hydrolysis-resistant layer materials.
3. Comparative example 3:
the same preparation method as in example 3 was conducted except that in comparative example 3, 65 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600) and 35 parts by weight of titanium dioxide (TiO) were used2) (rutile structure) to form a mixture of the first weathering layer material.
4. Comparative example 4:
the same preparation method as in example 3 was conducted except that in comparative example 4, 53 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 35 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 12 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
5. Comparative example 5:
the same preparation method as in example 3 except that comparative example 5 is a mixture in which 92.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (standard chemical fiber, type: FG600) and 7.5 parts by weight of polycarbodiimide (Laveny, type: M20) were uniformly mixed to form a first weather resistant layer material.
6. Comparative example 6:
the same procedure as in example 3 was conducted except that in comparative example 6, 32.5 parts by weight of a high temperature resistant polyethylene terephthalate (PET) resin (typical chemical fiber, type: FG600), 60 parts by weight of titanium dioxide (TiO) were added2) (rutile structure) and 7.5 parts by weight of polycarbodiimide (langey, type: M20) were mixed uniformly to form a mixture of the first weathering layer material.
7 comparative example 7:
the same as the production method of example 1 except that comparative example 7 was a method in which the ratio of the extrusion amounts of the hydrolysis-resistant layer and the first weather-resistant layer was changed to 30: 1. after extrusion, cooling was carried out to form a PET film comprising a hydrolysis-resistant layer having a thickness of 240 μm and a first weather-resistant layer having a thickness of 8 μm.
8. Comparative example 8:
the same as the production method of example 1 except that comparative example 8 was a method in which the ratio of the extrusion amounts of the hydrolysis-resistant layer and the first weather-resistant layer was changed to 2: 1. after extrusion, cooling was carried out to form a PET film comprising a hydrolysis-resistant layer having a thickness of 80 μm and a first weather-resistant layer having a thickness of 40 μm.
9. Comparative example 9:
a commercial fluorocarbon coated product wherein the total thickness of the product is 300 μm and the surface coating thickness is 15 μm and the back coating thickness is 8 μm.
After the solar back sheets of the above examples and comparative examples are completed, the thickness, width and length of the finished product are recorded to determine the volume parameters of the solar back sheet. The solar back sheets of the above examples and comparative examples were then subjected to the strength and weather resistance tests described in the following test methods.
II, a test mode:
and (3) testing the damp heat:
the solar back panel sample to be tested was placed in a hot and humid environment at 85 ℃ and 85% relative humidity for 1000 hours (hr).
Ultraviolet aging test:
the solar back panel sample to be tested is exposed to ultraviolet rays with the wavelength of 340nm for 1000 hours (hr), and the specific operating standard can refer to ASTM E313.
And (3) testing tensile strength:
before and after the damp heat test or the ultraviolet aging test, the tensile strength test is used to measure the elongation strength and the elongation at break of the solar back panel sample, and the specific operating standard can refer to ASTM D882.
Chroma (Δ b) test:
a colorimeter (Hunter Lab, model: Color Quest XE) is used for measuring the b value of a sample to be measured, and a difference value (delta b) before and after a damp-heat test or an ultraviolet aging test is calculated, wherein the larger the delta b is, the larger the yellowing degree is, and the specific operation standard and method can refer to CIE 1976 and ASTM E313.
The results of experimental parameters for the various examples and comparative examples are shown in table 1 below.
TABLE 1
TABLE 1-1
Figure BDA0002085381660000121
Figure BDA0002085381660000131
Tables 1 to 2
Figure BDA0002085381660000132
Tables 1 to 3
Figure BDA0002085381660000133
Figure BDA0002085381660000141
Tables 1 to 4
Figure BDA0002085381660000142
Figure BDA0002085381660000151
As can be seen from the data in tables 1-1 to 1-4, the solar back sheet provided in the present application has excellent UV resistance and the results of various strength tests and weather resistance tests can reach or even exceed the weather resistance of the conventional double-coated fluororesin layer back sheet, compared to comparative example 9.
First, as shown in Table 1-1, it can be seen by comparing comparative examples 1-2 with examples 1-4 that when the polycarbodiimide content in the hydrolysis-resistant layer is within the range provided in the examples of the present application, the tensile strength of the solar back sheet after the wet heat test is significantly improved while the elongation at break maintenance rate before and after the wet heat test can be maintained close to about 70%. This represents that the solar back sheet of the present application effectively improves the weather resistance in a humid and hot environment by adding a proper amount of carbodiimide in the hydrolysis-resistant layer.
Furthermore, as shown in tables 1-2, it can be seen by comparing comparative examples 3-4 with examples 5-7 that when the polycarbodiimide content in the first weathering layer is within the range provided in the examples of the present application, the tensile strength of the solar back sheet after the wet heat test is also significantly improved, while the elongation at break maintenance rate before and after the wet heat test can be maintained close to about 70%. This represents that the solar back sheet of the present application effectively improves the weather resistance in a hot and humid environment by adding an appropriate amount of carbodiimide to the first weather-resistant layer. In addition, according to the test results of example 11, it can be seen that the lack of titanium dioxide in the hydrolysis-resistant layer of the present application, although slightly reducing the performance in the wet heat test and the ultraviolet aging test, can still provide good weather resistance in the solar back panel structure compared to example 3.
Furthermore, as shown in tables 1 to 3, it can be seen by comparing comparative example 5 with examples 8 to 10 that when the content of titanium dioxide in the first weathering layer is within the range provided in the examples of the present application, the tensile strength of the solar back sheet after the uv aging test is significantly improved while the elongation at break maintenance rate before and after the uv aging test can be maintained close to about 60%. This represents that the solar back sheet of the present application effectively improves the weather resistance of the solar back sheet in an ultraviolet environment by adding a proper amount of titanium dioxide to the first weather-resistant layer.
Finally, as shown in tables 1 to 4, by comparing comparative examples 7 and 8 with examples 1 and 12, it can be understood that the thicknesses of the hydrolysis-resistant layer and the first weather-resistant layer can be adjusted by changing the extrusion amounts of the hydrolysis-resistant layer and the first weather-resistant layer. When the thickness of the hydrolysis-resistant layer is within the range provided by the embodiment of the application, the tensile strength of the solar backboard is remarkably improved after a damp-heat test and an ultraviolet aging test. Meanwhile, when the thickness of the first weather-resistant layer is within the range provided by the embodiment of the application, the test results of the damp-heat test and the ultraviolet aging test of the solar back panel are remarkably improved. This means that the solar back sheet of the present application has better weather resistance when the thickness of the hydrolysis resistant layer is 100 μm to 500 μm and/or the thickness of the first weather resistant layer is 10 μm to 70 μm.
The solar backboard provided by the embodiment of the application can effectively reduce the use of the fluorine-containing polymer, and can further replace and improve the existing double-coating fluorine-containing resin layer backboard.
Reference throughout this specification to "some embodiments of the present application" or similar terms means that a particular feature, structure, or characteristic described in connection with the other embodiments is included in at least one embodiment and may not necessarily be present in all embodiments. Thus, respective appearances of the phrase "some embodiments of the present application" or similar terms in various places throughout this specification are not necessarily referring to the same embodiments. Furthermore, the particular features, structures, or characteristics of any specific embodiment may be combined in any suitable manner with one or more other embodiments. It should be understood that other variations and modifications of the embodiments described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the present application.
The technical content and technical features of the present application have been disclosed as above, however, those skilled in the art may still make various substitutions and modifications based on the teaching and disclosure of the present application without departing from the spirit of the present application. Therefore, the protection scope of the present application should not be limited to the disclosure of the embodiments, but should include various alternatives and modifications without departing from the scope of the present application, which is covered by the claims of the present patent application.

Claims (8)

1. A solar back sheet, comprising:
a hydrolysis-resistant layer comprising a first surface and a second surface opposite the first surface;
a first weathering layer disposed on the first surface; and
a second weatherable layer disposed on the second surface, wherein the second weatherable layer has a thickness of 2 μ ι η to 20 μ ι η.
2. The solar backsheet according to claim 1, wherein the hydrolysis-resistant layer has a thickness of 100 to 500 μm.
3. The solar back sheet of claim 1, wherein the first weatherable layer has a thickness of 10 to 70 μ ι η.
4. The solar back sheet of claim 1, further comprising: and a protective layer.
5. The solar back sheet of claim 1, wherein the hydrolysis resistant layer is a modified polyester resin layer.
6. The solar back sheet of claim 1, wherein the first weatherable layer is a modified polyester resin layer.
7. The solar back sheet of claim 1, wherein the second weatherable layer comprises a fluorocarbon resin, an aqueous polyurethane resin, a saturated polyester resin, or a hydroxy acrylic resin.
8. A solar cell module comprising, in order, a front sheet, a layer of encapsulant material, and the solar back sheet of any of claims 1-7, wherein the layer of encapsulant material comprises one or more solar cells, the second weatherable layer being adhered to the layer of encapsulant material.
CN201920841649.4U 2018-11-20 2019-06-05 Solar backboard and solar cell module comprising same Expired - Fee Related CN209963070U (en)

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