CN219171861U - Moisture-heat aging resistant composite layer, photovoltaic backboard and photovoltaic module - Google Patents
Moisture-heat aging resistant composite layer, photovoltaic backboard and photovoltaic module Download PDFInfo
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Abstract
The utility model discloses a wet heat aging resistant composite layer, a photovoltaic backboard and a photovoltaic module, which at least comprise 1 fiber fabric layer, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are compounded on the upper surface and the lower surface of the fiber fabric layer; or at least comprises a fiber fabric layer A, a fiber fabric layer B, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are respectively compounded on the outer surfaces of the fiber fabric layer A and the fiber fabric layer B; wherein, an intermediate thermoplastic adhesive film layer is compounded between the fiber fabric layer A and the fiber fabric layer B; each thermoplastic film layer is made of thermoplastic polymer; the utility model has excellent performance of humidity resistance and heat aging resistance.
Description
Technical Field
The utility model relates to the technical field of photovoltaic packaging, in particular to a wet heat aging resistant composite layer, and also relates to a photovoltaic backboard and a photovoltaic module applying the composite layer.
Background
In order to meet the water-blocking permeability and mechanical load required by the photovoltaic back packaging structure, the requirements of basic waterproof, insulating and other performances are met. Based on the comprehensive performance consideration and the current state of the art, the prior art mostly adopts PET (abbreviation of English Polyethylene terephthalate) substrate as the back plate structure of the photovoltaic module, and the PET substrate has excellent mechanical properties, but is expensive and not hydrolysis-resistant. Therefore, improvement is still desired, a technical scheme for compounding a multilayer structure is proposed, for example, an utility model patent with an authorized publication number of CN205122610U discloses a functional multilayer compound photovoltaic backboard, which is formed by sequentially superposing a weather-proof outer layer a, a weather-proof outer layer B, an intermediate base layer, an inner layer a and an inner layer B from top to bottom, wherein the weather-proof outer layer a, the weather-proof outer layer B, the intermediate base layer and the inner layer a are all bonded by a polymer adhesive, and the inner layer B is a lower surface coating of the inner layer a. The utility model passes through the structureThe design increases two layers of weather-proof polyolefin films, obviously improves the performances of the backboard, such as water vapor barrier property, thermal conductivity, partial discharge and the like, and the water vapor permeability of the backboard is less than 1.0g/m 2 Day; another patent of the utility model with the publication number of CN108520905A discloses a novel fluoride-free photovoltaic backboard with a composite structure and a preparation method thereof, wherein the novel fluoride-free photovoltaic backboard with the composite structure comprises an outer layer, an intermediate layer and an inner layer, the outer layer is a PET (polyethylene terephthalate) polyester film, and the PET polyester film is added with TiO (titanium dioxide) 2 The biaxially oriented PET polyester film used as the barrier filler is characterized in that the middle layer is polyurethane resin adhesive, the inner layer is PE film, and the film is TiO-added film 2 White polyethylene film as barrier filler. However, although the overall performance of the back plate structure is improved to a certain extent, the adopted functional layer structure becomes more and more complex, the preparation process is complex, and the performance improvement effect is still limited.
For this reason, the applicant has proposed a prior patent application (publication No. CN 211555907U) in which a reinforced photovoltaic composite back sheet having high-efficiency water vapor barrier property is used as the back sheet, and a continuous fiber reinforced thermoplastic polymer unidirectional tape single-layer structure or a multilayer laminated structure is used as the photovoltaic composite back sheet, which has excellent water vapor barrier property and mechanical load at the same time, but the preparation process of the unidirectional tape single-layer is complicated, the preparation process of the multilayer laminated structure is more complicated and tedious, and the production efficiency is low.
For this reason, the applicant decided to further seek technical solutions to improve the above technical problems based on the above state of the art.
Disclosure of Invention
In view of the above, the present utility model aims to provide a composite layer, a photovoltaic back sheet and a photovoltaic module having excellent performance of heat and humidity aging resistance.
The technical scheme adopted by the utility model is as follows:
a wet heat aging resistant composite layer at least comprising 1 fiber fabric layer, and a first thermoplastic film layer and a second thermoplastic film layer which are compounded on the upper surface and the lower surface of the fiber fabric layer; each thermoplastic film layer is made of thermoplastic polymer.
The composite layer resistant to wet heat aging at least comprises a fiber fabric layer A, a fiber fabric layer B, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are respectively compounded on the outer surfaces of the fiber fabric layer A and the fiber fabric layer B; wherein an intermediate thermoplastic adhesive film layer is compounded between the fiber fabric layer A and the fiber fabric layer B; each thermoplastic film layer is made of thermoplastic polymer.
Preferably, the thermoplastic polymer is any one of polypropylene, polyethylene, polystyrene, polyvinyl chloride and ABS copolymer.
Preferably, the fibrous fabric layer is in a plain and/or twill form.
Preferably, the fibrous fabric layer is woven from continuous fibers.
Preferably, the continuous fibers are glass fibers or carbon fibers or aramid fibers.
Preferably, the thickness of the dimensional fabric layer ranges from 0.05 to 10mm; and/or each thermoplastic film layer has a thickness in the range of 0.05 to 5mm.
Preferably, a photovoltaic backsheet employing a composite layer as described above.
Preferably, the outer surface of the composite layer is provided with a weather-resistant coating.
Preferably, a photovoltaic module comprises a photovoltaic front panel, a photovoltaic cell string and a photovoltaic back panel, wherein the photovoltaic back panel adopts the photovoltaic back panel.
Preferably, a protective film layer is arranged between the photovoltaic cell string and the photovoltaic backboard, and/or the photovoltaic front board comprises a rigid light-transmitting board or a flexible light-transmitting board.
The applicant has surprisingly found that the composite layer has very excellent tensile strength and extremely low shrinkage rate on the basis of light weight, and meanwhile, the tensile strength attenuation rate after PCT aging is not more than 50% all the time, and the composite layer has very excellent performance of moisture and heat aging resistance, and is very suitable for being applied as a back plate of a photovoltaic module.
Drawings
FIG. 1 is a schematic view of a wet heat aging resistant composite layer structure in example 1 of the present application;
FIG. 2 is a schematic view of the structure of FIG. 1 in an exploded state;
FIG. 3 is a schematic view of a wet heat aging resistant composite layer structure in example 2 of the present application;
FIG. 4 is a schematic view of a wet heat aging resistant composite layer structure in example 3 of the present application;
FIG. 5 is a schematic view of a wet heat aging resistant composite layer structure in example 4 of the present application.
Detailed Description
The embodiment of the utility model discloses a wet heat aging resistant composite layer which at least comprises 1 fiber fabric layer, a first thermoplastic film layer and a second thermoplastic film layer which are compounded on the upper surface and the lower surface of the fiber fabric layer, wherein each thermoplastic film layer is made of thermoplastic polymers, and the fiber fabric layer is woven by continuous fibers. In practice, the plurality of structural units comprising the first thermoplastic film layer/the fibrous web layer/the second thermoplastic film layer may be selected according to the actual application requirements.
Further, the embodiment of the utility model also discloses a wet heat aging resistant composite layer which at least comprises a fiber fabric layer A, a fiber fabric layer B, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are respectively compounded on the outer surfaces of the fiber fabric layer A and the fiber fabric layer B; wherein, an intermediate thermoplastic adhesive film layer is compounded between the fiber fabric layer A and the fiber fabric layer B; each thermoplastic film layer is made of a thermoplastic polymer, that is, a layer structure of a first thermoplastic film layer/a fiber fabric layer a/an intermediate thermoplastic film layer/a fiber fabric layer B/a second thermoplastic film layer is formed, wherein the intermediate thermoplastic film layer serves as both the second thermoplastic film layer of the fiber fabric layer a and the first thermoplastic film layer of the fiber fabric layer B.
In the implementation of the application, each thermoplastic film layer is compounded on the fiber fabric layer through the dipping and melting compound forming process, and other compound processes with similar effects can also be adopted.
Of course, the functional layer, such as a weather-proof coating, may be further disposed on the outer surface of the composite layer according to practical application requirements, so long as the composite layer is ensured to include a structural unit formed by compounding the first thermoplastic film layer/the fiber fabric layer/the second thermoplastic film layer during implementation, and the technical effect of the present application may be achieved.
Preferably, in the present embodiment, the continuous fiber should have a high elastic modulus and high temperature resistance, be woven into a fiber fabric layer and then be used as a composite matrix layer of thermoplastic polymer, and the thermoplastic polymer is fully impregnated, melted and leveled on the composite matrix layer to obtain a thermoplastic film layer; further preferably, in the present embodiment, any one of glass fiber (elastic modulus is 65 to 86Gpa, and melting point is more than 650 ℃), carbon fiber (elastic modulus is more than 600Gpa, melting point is more than 800 ℃), aramid fiber (elastic modulus is more than 100Gpa, melting point is more than 500 ℃) and other continuous fiber having high elastic modulus and high temperature resistance performance can be used, and in order to ensure excellent performance of the composite layer of the present application, the applicant suggests that the elastic modulus of the selected continuous fiber should be more than 10Gpa, more preferably more than 30Gpa.
Preferably, in this embodiment, the fiber fabric layer may take any known texture weaving shape, and the present example is not particularly limited; particularly preferably, the fibrous fabric layer may take a plain and/or twill form.
Preferably, the thermoplastic polymer should have a good melt index performance, ensuring the effect of the application in carrying out the dip melt composite molding process, and further preferably, in the present embodiment, the thermoplastic polymer includes any one or a mixture of several of polypropylene, polyethylene, polystyrene, polyvinyl chloride, ABS copolymer, although it is also possible to use a thermoplastic polymer having a good melt index performance, and the application is not particularly limited in carrying out. In order to facilitate the weather-resistant and aging-resistant effects of the plastic film layer, preferably, in the present embodiment, the thermoplastic polymer is added with a heat-resistant and/or ultraviolet-resistant aging agent, further preferably, in the present embodiment, the heat-resistant and aging agent includes any one or a mixture of several of a phenolic antioxidant, a phosphite antioxidant and a hindered amine light stabilizer, although any other known heat-resistant and aging agent may be used, and the present example is not particularly limited thereto; the anti-ultraviolet aging agent includes any one or a mixture of a plurality of benzophenones, benzotriazoles, salicylates, substituted acrylonitriles and triazines, and any other known anti-thermal-oxidative aging agent can be adopted, and the embodiment is not particularly limited.
To facilitate the melt thermoplastic forming effect of each thermoplastic film layer on the fibrous web layer, preferably, in this embodiment, the thermoplastic polymer has a melt index in the range of 0.1 to 60g/10min, more preferably 2 to 50g/10min, according to ASTM D1238-2010 at 190 ℃/2.16kg test conditions; of course, in the dip melt composite forming process, the continuous fibers in the fibrous web layer of the present application are in a non-molten state when the thermoplastic polymer is in a molten state, and therefore, the melting point of the continuous fibers of the present application should be significantly higher than the melting point of the thermoplastic polymer, and particularly preferably, the melting point of the thermoplastic polymer of the present application is typically 80-200 ℃, and the melting points of the continuous fibers are typically both greater than 300 ℃.
The composite layer structure is obtained by compositing the fiber fabric layer and the thermoplastic film layer, and has the advantage of light weight, preferably, the gram weight of the composite layer is not more than 1200g/m in the embodiment 2 More preferably not more than 800g/m 2 Further preferably not more than 600g/m 2 Typically, the grammage ranges from 200 to 500g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Further, in the present embodiment, the grammage of the fibrous fabric layer is generally in the range of 120-350g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The gram weight of the thermoplastic film is 50-120g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Of course, in the implementation, a person skilled in the art may select a specific material according to actual needs, and the embodiment is not particularly limited. Preferably, in this embodiment, the fibrous web layer has a thickness in the range of 0.05 to 10mm, more preferably 0.1 to 6mm, further preferably 0.5 to 4mm; preferably, in this embodiment, the thickness of each thermoplastic film layer is in the range of 0.05 to 5mm, more preferably 0.1 to 2mm, still more preferably 0.2 to 1mm.
Preferably, this embodiment provides a method for preparing a composite layer resistant to wet heat aging as described above, and the dip-melting composite forming process at least includes the following operation steps:
s10), coating a thermoplastic polymer on a fiber fabric layer in a film impregnation or powder impregnation or electrostatic fluidized bed impregnation mode to obtain a pre-impregnated composite layer; the film impregnation or powder impregnation or electrostatic fluidized bed impregnation modes referred to in the present application are all conventional impregnation processes adopted in the composite material field, specifically, film impregnation generally refers to heating a thermoplastic polymer to a molten state, and impregnating a fiber fabric layer in the molten thermoplastic polymer; powder impregnation refers to the application of a powdered thermoplastic polymer to a fibrous web layer by spraying or brushing or other known means; the electrostatic fluidized bed impregnation method is to coat the powdery thermoplastic polymer on the fiber fabric layer by electrostatic fluidization (the implementation equipment can adopt a known electrostatic fluidized bed); of course, other known methods of impregnating the thermoplastic polymer onto the fibrous web layer may be used, and this embodiment is not particularly limited in this regard;
s20), heating and pressurizing the pre-impregnated composite layer through a compounding machine to enable the melted thermoplastic polymer to be extruded and molded on the fiber fabric layer; in specific implementation, the prepreg composite layer can be heated and pressurized by a roll compounding machine or a steel belt compounding machine or other known material compounding machines, the heating temperature is higher than the melting point of the thermoplastic polymer adopted in the prepreg composite layer, and the pressurizing range can be selected as follows: the specific pressurizing parameters of 0.01-0.6Mpa, more preferably 0.05-0.5Mpa, still more preferably 0.1-0.4Mpa, can be selected by conventional techniques according to actual compounding needs, and this embodiment is not particularly limited thereto;
s30), obtaining the wet heat aging resistant composite layer.
Preferably, step S40) is added after step S30), the surface of the composite layer is subjected to corona treatment, and in other embodiments, flame treatment or other known surface treatment processes may be used; the surface treatment is used for improving the surface energy of the composite layer, and is particularly preferred, so that the surface dyne value of the composite layer is more than or equal to 48dyn/cm, the surface of the composite layer has excellent adhesive force performance, and further composite processing (particularly comprising the arrangement of a weather-resistant layer and/or the subsequent lamination and compounding of a photovoltaic module) is facilitated;
preferably, the embodiment also provides application of the above composite layer resistant to damp-heat aging, and the composite layer resistant to damp-heat aging is used as a back plate of the photovoltaic module (namely, a photovoltaic back plate); further preferably, in the present embodiment, the photovoltaic module includes a photovoltaic front sheet, a photovoltaic cell string, and a photovoltaic back sheet that are integrated by lamination (or are integrated by other means). Preferably, in order to further facilitate the flexible protection effect on the photovoltaic cell string, in this embodiment, a protective film layer (specifically, a conventional mainstream EVA film layer or other known film layers may be adopted) is disposed between the photovoltaic cell string and the photovoltaic back plate, and a protective film layer is also disposed between the photovoltaic cell string and the photovoltaic front plate; particularly preferably, in this embodiment, the photovoltaic front panel may be a rigid light-transmitting panel (for example, glass) or a flexible light-transmitting panel, and the flexible light-transmitting panel may specifically be a photovoltaic module packaging material technology previously proposed by the applicant: CN201610685536.0, CN201610685240.9 and CN201610927464.6 are thin, light in weight and light in transmittance.
In order to further improve the weather resistance of the photovoltaic backboard, preferably, in the embodiment, a weather-resistant layer is arranged on the outer surface of the corresponding thermoplastic adhesive film layer positioned on the outer surface of the photovoltaic backboard, and particularly, a fluorine-containing weather-resistant coating or other weather-resistant coatings can be adopted in implementation, and particularly, the weather-resistant layer can be arranged in a brush coating or spraying mode or hot melt adhesion mode, which are all conventional technical choices which can be made by a person skilled in the art based on the content of the application; naturally, the weather-resistant layers may be disposed on the outer surfaces of the first thermoplastic film layer and the second thermoplastic film layer, and may be implemented in various ways according to practical application requirements, which is not particularly limited in this embodiment.
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
Example 1: referring to fig. 1 and 2, a wet heat aging resistant composite layer 10 includes 1 fiber fabric layer 11, and a first thermoplastic film layer 12 and a second thermoplastic film layer 13 compounded on the upper and lower surfaces of the fiber fabric layer 11, wherein each thermoplastic film layer 12, 13 is compounded on the upper and lower surfaces of the fiber fabric layer 11 by a dipping and melting composite molding process, each thermoplastic film layer 12, 13 is made of polypropylene, and the fiber fabric layer 11 is woven by glass fibers and has a twill shape.
In the preparation process, polypropylene is coated on the fiber fabric layer 11 in a film impregnation mode to obtain a pre-impregnated composite layer; heating and pressurizing the pre-impregnated composite layer by a rolling composite machine, wherein the heating temperature is 200-220 ℃, and the pressurizing pressure is 0.1-0.25Mpa; extruding the molten polypropylene on the fiber fabric layer to obtain a wet heat aging resistant composite layer 10; the surface of the composite layer 10 is corona treated.
The composite layer 10 obtained in example 1 was examined to have a gram weight of the thermoplastic film of 85g/m 2 The glass fiber had a grammage of 300g/m 2 Tensile strength 200MPa, shrinkage 0%, and tensile strength attenuation 35% after PCT aging; the water vapor barrier permeability is 0.21 g/(m) 2 ·24h)。
The composite layer 10 obtained in this embodiment 1 is applied as a back sheet of a photovoltaic module, where the photovoltaic module in this embodiment 1 includes a flexible photovoltaic front sheet, a first EVA film layer, a photovoltaic cell string layer, a second EVA film layer, and the above-mentioned photovoltaic modules in this embodiment 1The composite layer 10 is provided with a weight of less than 2kg/m 2 。
Example 2: the other technical solutions of this embodiment 2 are the same as embodiment 1, except that in this embodiment 2, please refer to fig. 3, after the corona treatment is performed on the surface of the composite layer 10 in embodiment 1, a fluorocarbon weather-resistant coating 14 is further coated on the outer surface of the second thermoplastic film layer 13.
The test shows that the tensile strength of the composite layer obtained in the example 2 is 200MPa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 35%; the water vapor barrier permeability is 0.21 g/(m) 2 ·24h)。
Example 3: the other technical solutions of this embodiment 3 are the same as embodiment 1, except that in this embodiment 3, please refer to fig. 4, a wet heat aging resistant composite layer 20 includes a fiber fabric layer a21 and a fiber fabric layer B22, and a first thermoplastic film layer 23 and a second thermoplastic film layer 24 respectively laminated on the outer surfaces of the fiber fabric layer a21 and the fiber fabric layer B22; wherein, an intermediate thermoplastic adhesive film layer 25 is compounded between the fiber fabric layer A21 and the fiber fabric layer B22; in preparation, after the fiber fabric layer a21 and the fiber fabric layer B22 are impregnated, a pre-impregnated composite layer a and a pre-impregnated composite layer B are obtained respectively, and then the pre-impregnated composite layer a and the pre-impregnated composite layer B are stacked, and the stacked pre-impregnated composite layers are heated and pressurized by a compounding machine, so that the wet heat aging resistant composite layer 20 is obtained.
The composite layer 20 obtained in example 3 was examined to have a gram weight of the thermoplastic film of 135g/m 2 The glass fiber has a gram weight of 350g/m 2 The tensile strength is 260MPa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 25%; the water vapor barrier permeability is 0.18 g/(m) 2 ·24h)。
Example 4: the other technical solutions of this embodiment 4 are the same as those of embodiment 3, except that in this embodiment 4, please refer to fig. 5, after the corona treatment is performed on the surface of the composite layer 20 in embodiment 3, a fluorocarbon weather-resistant coating 26 is further coated on the outer surface of the second thermoplastic film layer 24.
Through detection, the present embodimentIn the composite layer obtained in example 4, the tensile strength was 260MPa, the shrinkage was 0%, and the tensile strength attenuation after PCT aging was 25%; the water vapor barrier permeability is 0.18 g/(m) 2 ·24h)。
Example 5: the remaining technical solution of this embodiment 5 is the same as that of embodiment 1 or 3, except that in this embodiment 5, polyethylene is used as the thermoplastic polymer.
The composite layer obtained in example 5 was examined to have a gram weight of 75g/m of the thermoplastic film 2 The glass fiber had a grammage of 180g/m 2 Tensile strength is 150MPa, shrinkage is 0%, and tensile strength attenuation degree after PCT aging is 40%; the water vapor barrier permeability is 0.25 g/(m) 2 ·24h)。
Example 6: the remaining technical solution of this embodiment 6 is the same as that of embodiment 1 or 3, except that in this embodiment 6, polystyrene is used as the thermoplastic polymer.
The composite layer obtained in example 6 was examined to have a gram weight of 102g/m of the thermoplastic film 2 The glass fiber has a gram weight of 220g/m 2 The tensile strength is 180MPa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 38%; the water vapor barrier permeability is 0.24 g/(m) 2 ·24h)。
Example 7: the remaining technical solution of this embodiment 7 is the same as that of embodiment 1 or 3, except that in this embodiment 7, polyvinyl chloride is used as the thermoplastic polymer.
The composite layer obtained in example 7 was examined to have a gram weight of 80g/m of the thermoplastic film 2 The glass fiber had a grammage of 240g/m 2 The tensile strength is 210MPa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 42%; the water vapor barrier permeability is 0.26 g/(m) 2 ·24h)。
Example 8: the other technical solutions of this embodiment 8 are the same as those of embodiment 1 or 3, except that in this embodiment 8, an ABS copolymer is used as the thermoplastic polymer.
The composite layer obtained in example 8 was examined to have a gram weight of 98g/m of the thermoplastic film 2 The glass fiber had a grammage of 170g/m 2 Tensile strength of 240MPa and shrinkage0% and a tensile strength attenuation after PCT aging of 35%; the water vapor barrier permeability is 0.20 g/(m) 2 ·24h)。
Example 9: the other technical solutions of this embodiment 9 are the same as those of embodiment 1 or 3, except that in this embodiment 9, carbon fibers are used as the continuous fibers.
The test shows that the tensile strength of the composite layer obtained in the example 9 is 230Mpa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 30%; the water vapor barrier permeability is 0.20 g/(m) 2 ·24h)。
Example 10: the other technical solutions of this embodiment 10 are the same as those of embodiment 1 or 3, except that in this embodiment 10, aramid fibers are used as the continuous fibers.
The test shows that the tensile strength of the composite layer obtained in example 10 is 240MPa, the shrinkage rate is 25% of the tensile strength attenuation degree after PCT aging; the water vapor barrier permeability is 0.22 g/(m) 2 ·24h)。
Example 11: the remaining technical solution of this embodiment 11 is the same as that of embodiment 1 or 3, except that in this embodiment 11, the fiber fabric layer has a plain weave shape.
The composite layer obtained in this example 11 was examined to have a gram weight of the thermoplastic film of 85g/m 2 The glass fiber had a grammage of 285g/m 2 The tensile strength is 240MPa, the shrinkage rate is 0%, and the tensile strength attenuation degree after PCT aging is 35%; the water vapor barrier permeability is 0.21 g/(m) 2 ·24h)。
Comparative example 1: a composite layer formed by compositing a PVDF film, a PET film and a polyolefin film is adopted.
Through detection, in the composite layer obtained in the comparative example 1, the tensile strength is 80MPa, the shrinkage rate is 1%, and the tensile strength attenuation degree after PCT aging is 70%; the water vapor barrier permeability is more than 2.5 g/(m) 2 ·24h)。
Comparative example 2: adopting a gram weight of 350-450g/m 2 The thickness of the PET sheet is about 2-5mm.
The test shows that the composite layer obtained in comparative example 2 has a tensile strength of 85MPa, a shrinkage of 4% and a tensile strength attenuation after PCT aging80%; the water vapor barrier permeability is more than 3 g/(m) 2 ·24h)。
Comparative example 3: adopting a gram weight of 350-450g/m 2 The polypropylene sheet (without fibers) has a thickness of about 2-5mm.
Through detection, in the composite layer obtained in the comparative example 3, the tensile strength is 180MPa, the shrinkage is more than 8%, and the tensile strength attenuation degree after PCT aging is 90%; the water vapor barrier permeability is 0.22 g/(m) 2 ·24h)。
The elastic modulus data referred to throughout this application refer to tensile elastic modulus, and the test criteria referred to are: GB/T32376-2015; the test standard to which the tensile strength data refer is GB/T1040.3-2006: the test standard referred by the shrinkage data is GB2918-2018; the test standard referred by PCT aging is JESD22-A102-E autoclaving test, and the autoclaving time is 48 hours; the test standard to which the barrier vapor transmission data refers is GB/T26153-2010.
The applicant has surprisingly found that the composite layer obtained by the embodiments of the present application has very excellent tensile strength and very low shrinkage on the basis of light weight, and at the same time, the tensile strength attenuation rate after PCT aging is not more than 50% all the time, and has very excellent performance of resistance to heat aging, and is very suitable for application as a back sheet of a photovoltaic module.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The wet heat aging resistant composite layer is characterized by at least comprising 1 fiber fabric layer, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are compounded on the upper surface and the lower surface of the fiber fabric layer; each thermoplastic film layer is made of thermoplastic polymer; each thermoplastic film layer is compounded on the fiber fabric layer through an immersion melting compound forming process.
2. The composite layer of claim 1, wherein the fibrous fabric layer is in a plain and/or twill form.
3. The composite layer resistant to wet heat aging is characterized by at least comprising a fiber fabric layer A, a fiber fabric layer B, and a first thermoplastic adhesive film layer and a second thermoplastic adhesive film layer which are respectively compounded on the outer surfaces of the fiber fabric layer A and the fiber fabric layer B; wherein an intermediate thermoplastic adhesive film layer is compounded between the fiber fabric layer A and the fiber fabric layer B; each thermoplastic film layer is made of thermoplastic polymer; each thermoplastic film layer is compounded on the fiber fabric layer through an immersion melting compound forming process.
4. A composite layer according to claim 1 or 3, wherein the thermoplastic polymer is any one of polypropylene, polyethylene, polystyrene, polyvinylchloride, ABS copolymer.
5. A composite layer according to claim 1 or claim 3, wherein the fibrous fabric layer is woven from continuous fibres.
6. The composite layer of claim 5, wherein the continuous fibers are glass fibers or carbon fibers or aramid fibers.
7. A composite layer according to claim 1 or 3, wherein the thickness of the dimensional fabric layer is in the range of 0.05-10mm; and/or each thermoplastic film layer has a thickness in the range of 0.05 to 5mm.
8. A photovoltaic backsheet characterized in that it employs a composite layer according to one of claims 1 to 7.
9. The photovoltaic backsheet of claim 8 wherein the outer surface of the composite layer is provided with a weatherable coating.
10. A photovoltaic module comprising a photovoltaic front sheet, a string of photovoltaic cells, and a photovoltaic backsheet, wherein the photovoltaic backsheet employs the photovoltaic backsheet of claim 8 or 9.
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| CN114434891A (en) * | 2022-01-17 | 2022-05-06 | 上迈(镇江)新能源科技有限公司 | Composite layer capable of resisting damp-heat aging and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114434891A (en) * | 2022-01-17 | 2022-05-06 | 上迈(镇江)新能源科技有限公司 | Composite layer capable of resisting damp-heat aging and preparation method and application thereof |
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