CN213167269U - Multilayer extrusion type transparent solar photovoltaic back plate - Google Patents
Multilayer extrusion type transparent solar photovoltaic back plate Download PDFInfo
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- CN213167269U CN213167269U CN202021572395.XU CN202021572395U CN213167269U CN 213167269 U CN213167269 U CN 213167269U CN 202021572395 U CN202021572395 U CN 202021572395U CN 213167269 U CN213167269 U CN 213167269U
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- 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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Abstract
The utility model discloses a transparent solar photovoltaic backplate of type is extruded to multilayer, including transparent skin and transparent inlayer, transparent skin is made by the transparent modified material who has hydrolysis-resistant light-fast ageing, high temperature resistant, high vapor barrier property, transparent inlayer is made by transparent modified material. One side of the transparent outer layer far away from the transparent inner layer can be provided with a blocking protective layer. One side of the transparent inner layer far away from the transparent outer layer can be provided with a blocking protective layer. The utility model discloses a transparent solar photovoltaic backplate has excellent resistance to hydrolysis, light aging resistance, and the steam separation performance is high, and the interlaminar peel strength is high, and preparation simple process has good light transmissivity, and the backplate does not contain fluorine simultaneously and is convenient for retrieve, can alleviate subassembly weight, reduces the recovery pollution scheduling problem of compound backplate production process solvent.
Description
Technical Field
The utility model belongs to the technical field of the solar photovoltaic, concretely relates to transparent solar photovoltaic backplate of type is extruded to multilayer.
Background
In the development stage of photovoltaic technology, the photoelectric conversion efficiency is approaching to the theoretical limit more and more, and in order to further improve the photoelectric conversion efficiency, the double-sided assembly and the transparent back plate are the development direction of future photovoltaic assemblies.
A technical scheme of current transparent backplate is two glass backplates, but the main problem of existence is: high burst rate, heavy weight, difficult discharge of generated acetic acid, easy generation of PID phenomenon and the like.
201810577229.X discloses a production process of a KPF structure transparent backboard, which comprises the steps of compounding a transparent PVDF film and a PET film, coating a layer of fluorine-containing coating, and curing for 40 hours at 40 ℃.
Patent 201910409119.7 discloses a coating, a transparent back sheet and a method for preparing the same, wherein a coating comprising a resin, a silicate, a curing agent and a solvent is applied to a transparent substrate and cured to form a transparent back sheet. In addition, a certain time and temperature are required for curing, and the light transmittance of substrates such as pfet is easily reduced due to crystallization.
Therefore, a transparent back plate material and a preparation method thereof need to be developed, which can meet the basic requirements of back plates with weather resistance, low water vapor transmittance and the like, simultaneously achieve certain light transmittance, are convenient to recover, can reduce the weight of components, and reduce the problems of solvent recovery pollution and the like in the production process of composite back plates.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model discloses a technical scheme is: a multilayer extrusion type transparent solar photovoltaic back plate comprises a transparent outer layer and a transparent inner layer, wherein the transparent outer layer and the transparent inner layer are respectively made of transparent modified materials, and the transparent outer layer is made of transparent modified polyolefin materials, transparent nylon modified materials, transparent polycarbonate modified materials or transparent copolyester modified materials. The transparent inner layer is made of transparent modified polyolefin material, transparent nylon modified material, transparent polycarbonate modified material or transparent copolyester modified material. The transparent outer layer provides higher temperature resistance, and the transparent inner layer provides good bonding force with the packaging adhesive film.
Preferably, a blocking protective layer is arranged on one side, far away from the transparent inner layer, of the transparent outer layer. The function of the barrier protective layer on the transparent outer layer is to further improve the weather resistance and low water vapor permeability of the backboard.
Preferably, a blocking protective layer is arranged on one side of the transparent inner layer far away from the transparent outer layer. The function of the barrier protective layer on the transparent inner layer is to further improve the weather resistance and low water vapor permeability of the back plate.
Preferably, the barrier protective layer is made of ethylene-vinyl alcohol copolymer, polyvinylidene chloride or amorphous aromatic nylon. The ethylene-vinyl alcohol copolymer, polyvinylidene chloride or amorphous aromatic nylon and the like are high-barrier materials, and the prepared barrier protective layer improves the water vapor barrier capacity and the gas barrier capacity of the back plate. Prevent that steam from getting into inside the backplate and influencing the optical properties and other performances of backplate. Preventing oxygen from entering the backing plate and thermally oxidizing the backing plate.
Preferably, the thickness of the transparent outer layer is 100-300um, the thickness of the transparent inner layer is 20-50um, and the thickness of the barrier protective layer is 5-25 um.
Preferably, the back sheet is formed by extrusion molding using an extruder. In the extrusion process, the mutual permeation between the molecules in the high-temperature extrusion process between transparent outer layer and the transparent inner layer forms the tie layer, the mutual permeation between the molecules in the high-temperature extrusion process between the transparent outer layer and the separation protective layer also can form the tie layer, and the mutual permeation between the molecules in the high-temperature extrusion process between the transparent inner layer and the separation protective layer also can form the tie layer. Therefore, the tight joint connection between the transparent outer layer and the transparent inner layer, between the transparent outer layer and the separation protective layer and between the transparent inner layer and the separation protective layer can be realized respectively 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.
Preferably, the adhesive is respectively arranged between the transparent outer layer and the transparent inner layer, between the blocking protective layer and the transparent inner layer, and between the blocking protective layer and the transparent outer layer. The viscose is prepared by uniformly mixing PP, PE and POE, wherein the proportion of PP is 20-30%, the proportion of PE is 20-30%, and the proportion of POE is 20-40%. The bonding strength between layers can be further improved by using the viscose. The service life of the back plate is prolonged. The viscose glue made of PP, PE and POE has good light transmission, good combination degree with the transparent outer layer and the transparent inner layer, and no influence on the performance of the backboard.
The utility model has the advantages that: the utility model discloses a transparent solar photovoltaic backplate of type is extruded to multilayer utilizes the extruder to crowd shaping altogether. The formed back plate has excellent hydrolysis resistance, high light aging resistance and high water vapor barrier property, and the interlayer of the back plate can form a bonding layer under the co-extrusion effect, so that the back plate has higher peel strength compared with the traditional composite back plate, and has simple manufacturing process and high light transmittance. Meanwhile, the back plate does not contain fluorine, so that the recovery is convenient, the weight of the assembly can be reduced, and the problems of solvent recovery, pollution and the like in the production process of the composite back plate are solved.
Drawings
FIG. 1 is a schematic structural view of a multilayer extruded transparent solar photovoltaic backsheet according to a first embodiment;
FIG. 2 is a schematic view of a multilayer extruded transparent solar photovoltaic backsheet according to a second embodiment;
fig. 3 is a schematic structural diagram of a multilayer extruded transparent solar photovoltaic back sheet in the third embodiment.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the first embodiment, as shown in fig. 1, a multilayer extrusion-type transparent solar photovoltaic back sheet includes a transparent outer layer 1 and a transparent inner layer 2, which are attached to each other, the transparent outer layer 1 is made of a transparent modified polyolefin material formed by mixing polypropylene (PP) and a polyolefin elastomer (POE), wherein the weight ratio of polypropylene to polyolefin elastomer is 100:20, and the transparent outer layer 1 further contains a certain amount of an ultraviolet absorber and an antioxidant. The transparent inner layer 2 is made of transparent modified polyolefin material, the transparent modified polyolefin material of the layer is formed by mixing Polyethylene (PE) and polyolefin elastomer (POE), wherein the weight ratio of the polyethylene to the polyolefin elastomer is 100:20, and the transparent inner layer 2 also contains a certain amount of ultraviolet absorbent and antioxidant. The ultraviolet absorbers are all benzophenones, benzotriazoles or triazines, and in this example, benzophenones are selected. The antioxidants are bisphenol A phosphite and/or tetrakis (2, 4-di-tert-butylphenyl-4, 4' -biphenyl) bisphosphate, and in the present embodiment bisphenol A phosphite is preferred. The transparent modified polyolefin material of the transparent inner layer 2 formed by mixing ethylene (PE) and polyolefin elastomer (POE) can have good bonding force with the packaging adhesive film. The modified polyolefin material of which the transparent outer layer 1 is made of a mixture of polypropylene (PP) and polyolefin elastomer (POE) provides higher temperature resistance. The thickness of transparent outer 1 is 100um, the thickness of transparent inlayer 2 is 20 um. The backsheet of this embodiment is a co-extruded transparent backsheet 1.
The back plate is formed by extrusion of an extruder, and in the extrusion molding process, the parts, which are attached to each other, of the transparent outer layer 1 and the transparent inner layer 2 mutually permeate under the action of high-temperature environment and pressure to form a bonding layer 3 containing the material of the transparent outer layer 1 and the material of the transparent inner layer 2. Therefore, glue is not used for bonding, the transparent outer layer 1 and the transparent inner layer 2 can obtain higher bonding force, and the transparent outer layer 1 and the transparent inner layer 2 cannot be peeled and separated due to aging of glue and the like in the long-term use process. The tie coat 3 has increased the light-transmitting consistency of transparent outer 1 and transparent inlayer 2, has avoided forming the clearance between transparent outer 1 and the transparent inlayer 2, avoids water smoke, air admission clearance to influence photovoltaic module's efficiency.
In the second embodiment, as shown in fig. 2, a multilayer extruded transparent solar photovoltaic back plate comprises a barrier protective layer 4, a transparent outer layer 1 and a transparent inner layer 2, which are sequentially arranged, and the components and thicknesses of the transparent outer layer 1 and the transparent inner layer 2 are the same as those in the first embodiment. The barrier protective layer 4 is made of ethylene-vinyl alcohol copolymer (EVOH), and when the barrier protective layer 4 is made of the ethylene-vinyl alcohol copolymer, a certain amount of additives such as a plasticizer, a heat stabilizer, an antioxidant and the like are added. The alkaline earth metal salt in the ethylene-vinyl alcohol copolymer is controlled to be less than 5 ppm. The ethylene content of the ethylene-vinyl alcohol copolymer is controlled between 25 and 50 mol%. Viscose glue is respectively coated between the transparent outer layer 1 and the transparent inner layer 2 and between the barrier protective layer 4 and the transparent outer layer 1, and the viscose glue is prepared by uniformly mixing 30% of PP, 30% of PE and 40% of POE. The thickness of the barrier protection layer 4 is 10 um. The back plate is also formed by extrusion through an extruder, and in the extrusion forming process, the transparent outer layer 1 and the transparent inner layer 2 are fused and combined together, and the adhesive layer 3 is formed through adhesive bonding. The adhesive layer 3 thus formed has a stronger bonding force than the adhesive layer 3 in the first embodiment. The backsheet of this embodiment is a co-extruded transparent backsheet 2.
In a third embodiment, as shown in fig. 3, a multilayer extruded transparent solar photovoltaic back panel includes a barrier protection layer 4, a transparent outer layer 1, a transparent inner layer 2, and a barrier protection layer 4, which are sequentially disposed, and the components and thicknesses of the transparent outer layer 1 and the transparent inner layer 2 are the same as those in the first embodiment. Both barrier and protective layers 4 are made of polyvinylidene chloride (PVDC) and have the same thickness as the barrier and protective layer 4 in example two. The back plate is formed by co-extrusion by an extruder, and a bonding layer 3 with the same function is also formed between the transparent inner layer 1 and the barrier protective layer 4. The back sheet of this embodiment is a co-extruded transparent back sheet 3.
And carrying out performance test on the multilayer extrusion type transparent solar photovoltaic back plate with the three structures, and carrying out comparative analysis on the multilayer extrusion type transparent solar photovoltaic back plate with the traditional double-glass back plate and the transparent KPF back plate. The test results are shown in the following table.
It can be seen that the co-extruded transparent backsheet 1, the co-extruded transparent backsheet 2, and the co-extruded transparent backsheet 3 all can achieve superior retention of tensile strength and retention of elongation at break than conventional transparent KPF backsheets in different testing methods. The yellowness index delta YI is respectively 3.5, 2 and 5, the yellowness index is not large, and the color is slightly changed or slightly changed. Therefore, the utility model discloses the solar cell that the transparent solar photovoltaic backplate of type was extruded to the multilayer of structure was made also does not have the yellowing after exposing for a long time in external environment, and the luminousness can be guaranteed. The interlaminar peeling force obviously is greater than traditional transparent KPF backplate, shows the utility model discloses a peel strength of backplate is higher, and structural strength is higher. With survey after backplate and the EVA material laminating with EVA's peel strength, test data shows, compare with two glass backplates and transparent KPF backplate, the utility model discloses a can obtain higher peel strength performance after the transparent backplate of coextrusion combines with the EVA material. The water vapor transmission rate is obviously superior to that of a transparent KPF backboard, and the water vapor is prevented from entering the inside of the module to influence the photoelectric conversion efficiency and the service life of the photovoltaic module. The utility model discloses a proportion of crowded transparent backplate of type altogether is obviously less than the proportion of double glass backplate and transparent KPF backplate, can effectively alleviate subassembly weight.
It should be mentioned that the technical features such as the extruder that the utility model discloses a patent application relates to should be regarded as prior art, and the concrete structure, the theory of operation and the synthetic mode that may involve of these technical features adopt the conventional selection in this field can, should not regard as the invention point of the utility model to be in, the utility model discloses a do not do further specifically expand the detailed description.
Having described in detail preferred embodiments of the present invention, it is to be understood that modifications and variations can be made by persons skilled in the art without inventive faculty, and therefore all technical solutions which can be obtained by a person skilled in the art based on the concepts of the present invention through logic analysis, reasoning or limited experimentation will fall within the scope of protection defined by the claims.
Claims (3)
1. A multilayer extrusion type transparent solar photovoltaic backboard is characterized by comprising a transparent outer layer and a transparent inner layer, wherein the transparent outer layer and the transparent inner layer are respectively made of transparent modified materials, the transparent outer layer is made of transparent modified polyolefin materials, transparent nylon modified materials, transparent polycarbonate modified materials or transparent copolyester modified materials, the transparent inner layer is made of transparent modified polyolefin materials, transparent nylon modified materials, transparent polycarbonate modified materials or transparent copolyester modified materials, a blocking protective layer is arranged on one side, far away from the transparent inner layer, of the transparent outer layer, the blocking protective layer is arranged on one side, far away from the transparent outer layer, of the transparent inner layer, the blocking protective layer is made of ethylene-vinyl alcohol copolymer, polyvinylidene chloride or amorphous aromatic nylon, the thickness of the transparent outer layer is 100-300 mu m, the thickness of transparent inlayer is 20-50um, the thickness of separation protective layer is 5-25 um.
2. The multilayer extruded transparent solar photovoltaic backsheet of claim 1, wherein the backsheet is extruded through an extruder.
3. The multilayer extruded transparent solar photovoltaic backsheet of claim 2, wherein an adhesive is disposed between the transparent outer layer and the transparent inner layer, between the barrier protective layer and the transparent inner layer, and between the barrier protective layer and the transparent outer layer, respectively.
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| CN111775531A (en) * | 2020-08-01 | 2020-10-16 | 浙江中聚材料有限公司 | Multilayer extrusion type transparent solar photovoltaic back plate |
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| CN111775531A (en) * | 2020-08-01 | 2020-10-16 | 浙江中聚材料有限公司 | Multilayer extrusion type transparent solar photovoltaic back plate |
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