CN112928176A - Three-layer co-extrusion glue-free transparent solar photovoltaic back plate and preparation process thereof - Google Patents

Three-layer co-extrusion glue-free transparent solar photovoltaic back plate and preparation process thereof Download PDF

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CN112928176A
CN112928176A CN202110170841.7A CN202110170841A CN112928176A CN 112928176 A CN112928176 A CN 112928176A CN 202110170841 A CN202110170841 A CN 202110170841A CN 112928176 A CN112928176 A CN 112928176A
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transparent
layer
parts
solar photovoltaic
ldpe
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CN112928176B (en
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焦华
蔡书义
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Zhejiang Sinopoly Materials Co ltd
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Zhejiang Sinopoly Materials Co ltd
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    • H—ELECTRICITY
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
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    • H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • 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
    • H01L31/052—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells
    • 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
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/28—Nitrogen-containing compounds
    • C08K2003/282—Binary compounds of nitrogen with aluminium
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2201/011—Nanostructured additives
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
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    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/204—Applications use in electrical or conductive gadgets use in solar cells
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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    • C08L2205/00—Polymer mixtures characterised by other features
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    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)
    • 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
    • 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
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    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention belongs to the technical field of solar photovoltaic back panels, and particularly relates to a three-layer co-extrusion glue-free transparent solar photovoltaic back panel which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer; the preparation raw material of the transparent inner layer at least comprises polyolefin; the preparation raw materials of the transparent middle layer at least comprise polyolefin, and the preparation raw materials of the transparent outer layer at least comprise polyolefin and ethylene methacrylic acid ionomer.

Description

Three-layer co-extrusion glue-free transparent solar photovoltaic back plate and preparation process thereof
Technical Field
The invention belongs to the technical field of solar photovoltaic back panels, and particularly relates to a three-layer co-extrusion glue-free transparent solar photovoltaic back panel and a preparation process thereof.
Background
With the gradual exhaustion of carbon energy and the increasing maturity of solar photovoltaic power generation technology, in the near future, photovoltaic power generation will occupy important seats of world energy consumption, even become the main body of energy supply, but a photovoltaic module is used as a component monomer of a photovoltaic array, the core part of the photovoltaic module is a battery piece, but the service life and the working performance of the photovoltaic module are limited by each component part of the module, wherein the important part is the back plate of the photovoltaic module.
The back sheet of the existing photovoltaic module usually adopts a back film formed by three layers of thin films. For example, CN 109411558A discloses a solar cell back sheet, which is composed of an air-side protective layer, a skeleton layer and a film-side adhesive layer. But each layer principal ingredients is inequality, can increase the degree of difficulty that combines between layer in the forming process on the one hand, and on the other hand, because of the coefficient of thermal expansion of composition is different between the different layers, arouses easily in the use and produces stress concentration between layer to cause the layering and crack even, reduced life, and the backplate is not transparent, and the light of being inconvenient for pierces through, lacks heat dissipation functional design, is unfavorable for solar cell heat dissipation. In addition, the high content of the inorganic filler affects the flexibility, bending resistance and deformation resistance of the back plate.
Disclosure of Invention
In order to solve the problems, the invention provides a three-layer co-extrusion glue-free transparent solar photovoltaic back plate which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer; the preparation raw material of the transparent inner layer at least comprises polyolefin; the preparation raw materials of the transparent middle layer at least comprise polyolefin, and the preparation raw materials of the transparent outer layer at least comprise polyolefin and ethylene methacrylic acid ionomer.
As a preferred technical scheme, the polyolefin comprises at least one of LLDPE, LDPE, HDPE and PP.
As a preferable technical scheme, the preparation raw materials of the transparent inner layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of AlN.
As a preferable technical scheme, the preparation raw materials of the transparent middle layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP, 0.1-0.5 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine and 0.1-0.5 part of 2,2',4,4' -tetrahydroxybenzophenone.
As a preferable technical scheme, the preparation raw materials of the transparent outer layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of ethylene methacrylic acid ionomer.
As a preferable technical scheme, the AlN is nano AlN, and the particle size is 20-50 nm.
In a preferred embodiment, the weight ratio of the 2,2, 6, 6-tetramethyl-4-hydroxypiperidine to the 2,2',4,4' -tetrahydroxybenzophenone is 1 (0.8-1.2).
As a preferred technical solution, the ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer.
As a preferable technical scheme, the melt flow rate of PP 230 ℃/2.16kg is 5-20 g/10 min.
The invention also provides a preparation process of the three-layer co-extrusion glue-free transparent solar photovoltaic back plate, and the three-layer co-extrusion glue-free transparent solar photovoltaic back plate is formed by extrusion through an extruder.
Has the advantages that:
according to the solar photovoltaic back plate provided by the invention, the comprehensive performance of the photovoltaic back plate is improved through the three layers of functionalized transparent layers, and the back plate has higher weather resistance and permeability resistance than single polyolefin by adopting the blending of LLDPE, LDPE and PP. The inner layer also improves the heat conductivity and the thermal stability through specific nanometer AlN, thereby being beneficial to the heat dissipation of the solar cell and improving the conversion efficiency of the photovoltaic cell. The outer layer and the middle layer ensure the light transmittance and yellowing resistance through specific additives. The working efficiency and the service life of the solar cell module are improved.
Detailed Description
The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definition provided in the present disclosure, the definition of the term provided in the present disclosure controls.
As used herein, a feature that does not define a singular or plural form is also intended to include a plural form of the feature unless the context clearly indicates otherwise. It will be further understood that the term "prepared from …," as used herein, is synonymous with "comprising," including, "comprising," "having," "including," and/or "containing," when used in this specification means that the recited composition, step, method, article, or device is present, but does not preclude the presence or addition of one or more other compositions, steps, methods, articles, or devices. Furthermore, the use of "preferred," "preferably," "more preferred," etc., when describing embodiments of the present invention, is meant to refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
In order to solve the above problems, a first aspect of the present invention provides a three-layer co-extrusion glue-free transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is located between the transparent inner layer and the transparent outer layer; the preparation raw material of the transparent inner layer at least comprises polyolefin; the preparation raw materials of the transparent middle layer at least comprise polyolefin, and the preparation raw materials of the transparent outer layer at least comprise polyolefin and ethylene methacrylic acid ionomer.
In some preferred embodiments, the polyolefin comprises at least one of Linear Low Density Polyethylene (LLDPE), Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE), polypropylene (PP).
In some preferred embodiments, the polyolefin comprises a blend of LLDPE, LDPE, PP. The LLDPE has the density in the same range as that of LDPE, and is beneficial to keeping the uniformity of the density of the back plate after blending, and in addition, the addition of proper amount of LDPE can also improve the crystallinity of the LLDPE, so that the formed film has higher transparency.
In some preferred embodiments, the LLDPE has a density of from 0.920 to 0.930g/cm3More preferably 0.925g/cm3(ii) a The density of the LDPE is 0.920-0.930 g/cm3More preferably 0.925g/cm3。
For the solar photovoltaic back panel with the pair of layers, if the main components of each layer are different or the content difference of the main components is too large, the difficulty of combination between the layers in the co-extrusion one-step forming process is increased, and on the other hand, stress concentration is easily generated between the layers in the using process due to different thermal expansion coefficients of the components between the different layers, so that delamination and even cracking are caused, and the service life is shortened. To avoid these problems, in some preferred embodiments, the main components used in the three layers of the solar photovoltaic backsheet of the present invention are the same, all being a blend of LLDPE, LDPE and PP.
In some preferred embodiments, the raw materials for preparing the transparent inner layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of aluminum nitride (AlN). AlN has excellent thermal conductivity while having very good electrical insulation. The influence of the nano AlN with the content of 0.1-0.5 part on the transparency of the inner layer can be ignored, and the heat conductivity and the heat stability of the inner layer are improved. In some more preferred embodiments, the AlN is nano AlN, and the particle size is 20-50 nm, so that the dispersion uniformity of the AlN in the inner layer is facilitated.
In some preferred embodiments, the transparent middle layer is prepared from 5 to 20 parts by weight of LLDPE, 1 to 10 parts by weight of LDPE, 50 to 80 parts by weight of PP, 0.1 to 0.5 part by weight of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine and 0.1 to 0.5 part by weight of 2,2',4,4' -tetrahydroxybenzophenone. 2,2, 6, 6-tetramethyl-4-hydroxypiperidine in the middle layer can effectively capture free radicals in the backboard and inhibit the chain reaction of degradation and aging of the polymer; 1. the 2,2',4,4' -tetrahydroxybenzophenone has stable thermo-photochemical performance and can absorb ultraviolet light with the wavelength range of 320-400nm, so that the degradation of the backboard by the ultraviolet light is reduced, the yellowing phenomenon of the backboard is improved, the protection of an inner layer and a battery is improved, and the service life of the photovoltaic backboard is prolonged. In some more preferred embodiments, the weight ratio of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine to 2,2',4,4' -tetrahydroxybenzophenone is 1 (0.8 to 1.2).
In some preferred embodiments, the raw materials for preparing the transparent outer layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of ethylene methacrylic acid ionomer. The ethylene methacrylic acid ionomer in the outer layer contains metal salt (such as acid groups neutralized by metal parts such as zinc, sodium and the like), which can promote the original homogeneous nucleation to be changed into heterogeneous nucleation, increase the number of crystal nuclei in a crystallization system, increase the number of microcrystals, reduce the number of spherulites, further reduce the crystal size, improve the transparency of resin, further improve the high transmittance in a wider light wave range and improve the efficiency of a photovoltaic module. In some preferred embodiments, the ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer, such as the sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
In order to improve transparency, in some preferred embodiments, the PP is high-transparency PP, and in order to facilitate extrusion molding, in some preferred embodiments, the melt flow rate of the PP at 230 ℃/2.16kg is 5-20 g/10 min.
In order to improve or realize specific properties, in some preferred embodiments, some additives can be added to the raw materials for preparation of any one layer, and the additives are transparent additives in order not to affect the transparency of the back sheet. For example, to improve the weatherability of the backsheet, in some preferred embodiments, the raw materials from which the transparent outer layer is made further include a transparent antioxidant such as BHT, a transparent liquid antioxidant TPP, etc., and a light stabilizer such as Pasteur TINUVIN 765.
The invention also provides a preparation process of the three-layer co-extrusion glue-free transparent solar photovoltaic back plate, and the three-layer co-extrusion glue-free transparent solar photovoltaic back plate is formed by extrusion through an extruder. In the extrusion process, molecules between layers are mutually permeated to form a bonding layer in the high-temperature extrusion process, so that the layers can be tightly attached without using glue and the like. Compared with a composite mode of glue and the like, the composite structure can obviously improve the bonding strength between layers and prolong the service life of the back plate.
The preparation process of the three-layer co-extrusion glue-free transparent solar photovoltaic back plate comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; and uniformly mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer to obtain a transparent outer layer material.
S2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, then simultaneously carrying out melt extrusion in the screw extruders, and feeding the extruded three-layer molten materials into a composite die;
and S3, cooling the three layers of molten materials in the composite die, co-extruding the molten materials to obtain a composite film after the molten materials are cooled to the same temperature, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.
Example 1
Embodiment 1 provides a three-layer co-extrusion non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The transparent inner layer comprises 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise 10 parts of LLDPE, 5 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer in parts by weight.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
Embodiment 1 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Example 2
Embodiment 2 provides a three-layer co-extrusion non-adhesive transparent solar photovoltaic back plate, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The preparation raw materials of the transparent inner layer comprise, by weight, 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise 10 parts of LLDPE, 15 parts of LDPE, 75 parts of PP and 0.3 part of ethylene methacrylic acid ionomer in parts by weight.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
Embodiment 2 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Example 3
Embodiment 3 provides a three-layer co-extrusion non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The transparent inner layer comprises 10 parts of LLDPE, 5 parts of LDPE, 70 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise 10 parts of LLDPE, 5 parts of LDPE, 70 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise 10 parts of LLDPE, 5 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer in parts by weight.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
Embodiment 3 also provides a preparation process of a three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Example 4
Embodiment 4 provides a three-layer co-extrusion non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The transparent inner layer comprises 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise 15 parts of LLDPE, 5 parts of LDPE, 70 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP and 0.3 part of ethylene methacrylic acid ionomer in parts by weight.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
Embodiment 4 also provides a preparation process of a three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Example 5
Embodiment 5 provides a three-layer co-extrusion non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The transparent inner layer comprises 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise, by weight, 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The raw materials for preparing the transparent outer layer comprise, by weight, 10 parts of LLDPE, 5 parts of LDPE, 75 parts of PP, 0.3 part of ethylene methacrylic acid ionomer, 0.3 part of antioxidant BHT and 0.3 part of light stabilizer.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
The antioxidant BHT is transparent crystal particles, and is purchased from Gnaphalium Biotechnology Limited of Wuhanhua.
The light stabilizer was TINUVIN765 light stabilizer available from basf.
Embodiment 5 also provides a preparation process of a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP, ethylene methacrylic acid ionomer and antioxidant BHT uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Comparative example 1
Comparative example 1 provides a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The transparent inner layer comprises 20 parts of LLDPE (linear low-density polyethylene), 70 parts of PP (polypropylene), 0.3 part of AlN0.3 part of and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise, by weight, 20 parts of LLDPE, 70 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise, by weight, 10 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
The comparative example 1 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Comparative example 2
Comparative example 2 provides a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The preparation raw materials of the transparent inner layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise 10 parts of LLDPE, 5 parts of LDPE, 85 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
The comparative example 2 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Comparative example 3
Comparative example 3 provides a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The preparation raw materials of the transparent inner layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP and 0.3 part of AlN.
The preparation raw materials of the transparent middle layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine and 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone.
The preparation raw materials of the transparent outer layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE and 70 parts of PP.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
Comparative example 3 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Comparative example 4
Comparative example 4 provides a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The preparation raw materials of the transparent inner layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of 2,2',4,4' -tetrahydroxybenzophenone and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
Comparative example 4 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Comparative example 5
Comparative example 5 provides a three-layer co-extruded non-adhesive transparent solar photovoltaic back panel, which comprises a transparent inner layer, a transparent middle layer and a transparent outer layer, wherein the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer.
The preparation raw materials of the transparent inner layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of AlN and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent middle layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP, 0.3 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine and 0.3 part of ethylene methacrylic acid ionomer.
The preparation raw materials of the transparent outer layer comprise, by weight, 20 parts of LLDPE, 10 parts of LDPE, 70 parts of PP and 0.3 part of ethylene methacrylic acid ionomer.
The LLDPE was purchased from Exxon Mobil chemical and is available under the trade designation LLDPE LL 1201 Series.
The LDPE is purchased from Exxon Mobil chemical industry and has the trademark of LDPE LD 104 BR.
The PP is high-transparency PP, has a melt flow rate of 12g/10min at 230 ℃/2.16kg, is purchased from Taiwan chemical fiber and has a mark of K1216.
The AlN is nano AlN with the average grain diameter of 30nm, is purchased from Beijing German island gold science and technology Limited company and has the model of DK-AlN-001.
The ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer available from dupont under the designation SURLYN 8920 RESIN.
The comparative example 5 also provides a preparation process of the three-layer co-extruded glue-free transparent solar photovoltaic back panel, which comprises the following steps:
s1, according to the formula, mixing LLDPE, LDPE, PP and AlN uniformly to obtain a transparent inner layer material; mixing LLDPE, LDPE, PP, 2, 6, 6-tetramethyl-4-hydroxypiperidine and 2,2',4,4' -tetrahydroxy benzophenone uniformly to obtain a transparent middle layer material; mixing LLDPE, LDPE, PP and ethylene methacrylic acid ionomer uniformly to obtain a transparent outer layer material;
s2, respectively adding the transparent inner layer material, the transparent middle layer material and the transparent outer layer material into three groups of screws of a co-extruder, and then simultaneously carrying out melt extrusion in the screw extruders at the temperature of 250 ℃; the extruded three-layer molten material enters a composite die;
s3, cooling the three-layer molten material in the composite die, co-extruding the molten material to obtain a composite film after the temperature of the molten material is reduced to 200 ℃, and cooling, drawing and coiling the composite film to obtain the three-layer co-extruded glue-free transparent solar photovoltaic back panel.
Evaluation of Performance
1. Light transmittance test
The photovoltaic back sheets prepared in the above examples and comparative examples were tested for light transmittance higher than 90% using a split light transmittance tester DRTG-81; the results are shown in Table 1.
2. Interlaminar peel force test
The photovoltaic back sheets prepared in the above examples and comparative examples were subjected to interlaminar peeling force test using an interlaminar peeling strength tester PN-IBTF, and the results are shown in table 1.
3. Yellowing test
When the photovoltaic back sheets prepared in the above examples and comparative examples are tested for yellowing index, the yellowing index is less than or equal to 3.0 and recorded as a grade a, the yellowing index is greater than 3.0 and less than or equal to 6.0 and recorded as a grade B, the yellowing index is greater than 6.0 and recorded as a grade C, and the smaller the yellowing index is, the better the back sheet is in yellowing resistance is, and the results are shown in table 1.
TABLE 1
Figure BDA0002938879410000161
According to the embodiment and the comparative example, the invention provides the three-layer co-extrusion glue-free transparent solar photovoltaic back plate and the preparation method thereof.
Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a three-layer is crowded transparent solar photovoltaic backplate of no glue altogether which characterized in that: the transparent inner layer, the transparent middle layer and the transparent outer layer are included, and the transparent middle layer is positioned between the transparent inner layer and the transparent outer layer; the preparation raw material of the transparent inner layer at least comprises polyolefin; the preparation raw materials of the transparent middle layer at least comprise polyolefin, and the preparation raw materials of the transparent outer layer at least comprise polyolefin and ethylene methacrylic acid ionomer.
2. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 1, wherein: the polyolefin comprises at least one of LLDPE, LDPE, HDPE and PP.
3. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 2, wherein: the transparent inner layer comprises, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of AlN.
4. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 2, wherein: the preparation raw materials of the transparent middle layer comprise, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP, 0.1-0.5 part of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine and 0.1-0.5 part of 2,2',4,4' -tetrahydroxybenzophenone.
5. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 2, wherein: the transparent outer layer comprises, by weight, 5-20 parts of LLDPE, 1-10 parts of LDPE, 50-80 parts of PP and 0.1-0.5 part of ethylene methacrylic acid ionomer.
6. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 3, wherein: the AlN is nano AlN, and the particle size is 20-50 nm.
7. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 4, wherein: the weight ratio of the 2,2, 6, 6-tetramethyl-4-hydroxypiperidine to the 2,2',4,4' -tetrahydroxybenzophenone is 1 (0.8-1.2).
8. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to claim 5, wherein: the ethylene methacrylic acid ionomer is a sodium ion type ethylene methacrylic acid ionomer.
9. The three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to any one of claims 3 to 5, wherein: the melt flow rate of PP 230 ℃/2.16kg is 5-20 g/10 min.
10. The preparation process of the three-layer co-extruded non-adhesive transparent solar photovoltaic back panel according to any one of claims 1 to 9, characterized by comprising the following steps: the three-layer co-extrusion glue-free transparent solar photovoltaic back plate is extruded and molded through an extruder.
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