CN102529258B - Improved solar cell assembly back plate and manufacturing method thereof - Google Patents
Improved solar cell assembly back plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides an improved solar cell assembly back plate which comprises a base film layer, bonding layers on the two sides of the base film layer and a fourth film layer and a fifth film layer on the other two sides of the bonding layer, wherein the fourth film is a polyester film. Compared with the former back plate material, an expensive fluoropolymer film is not used in the invention, and a multi-layer PET film composite back plate is adopted, thereby remarkably saving the production cost of the back plate material; and meanwhile, the environmental pollution caused by the fluorine material is reduced. Moreover, as a new adhesive material and new manufacturing technology and bonding method are adopted, the problems of environmental pollution and high manufacturing cost caused by the solvent adhesive are solved, and the prepared PET back plate has excellent performance.
Description
Technical field
The present invention relates to a kind of solar cell module back veneer and manufacture method thereof, be specifically related to a kind of solar cell module back veneer of environment-friendly type.
Background technology
The current main energy sources of the mankind is from fossil energy, comprise oil, coal and natural gas, but the time of following about 100 years, fossil energy meeting approach exhaustion, and in using the process of fossil energy, can discharge a large amount of carbon dioxide, change atmospheric gas composition, cause the deterioration of terrestrial climate.The green regenerative energy sources of non-environmental-pollution is the unique channel that solves the challenge of mankind's energy and low-carbon emission.Solar electrical energy generation is one of most important green regenerative energy sources.At present, the development of solar electrical energy generation all, developing solar electrical energy generation as national energy strategy, is encouraged and facilitated energetically in countries in the world.In recent years, the solar energy industry of countries in the world is all fast-developing, is mainly support and everybody the craving for green regenerative energy sources that has benefited from government.
But, also there is at present very large challenge in solar cell power generation, is mainly that the cost of electricity-generating of solar cell is also higher than the cost of traditional fossil generating, in addition, in the manufacturing process of solar cell and assembly, there are some techniques to have well problem of environmental pollution.The development challenge of solar cell power generation is how by technological innovation, to improve design and the preparation of present solar cell and assembly manufacturing process and associated materials, avoids the pollution to environment, and continues to reduce the cost of solar electrical energy generation.
Solar cell power generation technology mainly comprises crystal silicon solar energy battery and thin-film solar cells, crystal silicon solar energy battery has two kinds of the monocrystalline silicon of comprising and polysilicons, and thin-film solar cells comprises: non-crystalline silicon, microcrystal silicon, copper Indium Gallium selenium, cadmium telluride, dye sensitization and the type such as organic.No matter be which kind of solar cell, all need to be prepared into solar module, semi-conductive battery is effectively protected and encapsulated, generating that could be permanently effective.Take crystal silicon solar battery component as example, the general low iron ultra-clear glasses of 3mm left and right that adopts is as the first half of assembly, the glued membrane of ethylene-vinyl acetate EVA of take is encapsulating material, be placed in respectively the both sides up and down of cell piece, the multilayer laminated film of polymer of take is backboard, under 140-150 ℃ of condition, by vacuum lamination process, make assembly, EVA glued membrane is bonded together cell piece and front glass sheet and backboard.Conventional solar module encapsulating material is polyvinyl butyral resin PVB in addition, and the polythene material of Silane Grafted, or other material.
Sunshine in the past glass sheet is injected, and through EVA glued membrane, arrives solar battery sheet, changes into electric energy.So the transmitance of glass is very important, guarantee that enough light incides cell piece.The function of backboard is mainly protection EVA glued membrane and cell piece, guarantees mechanical integrality, hydrolytic resistance, ultraviolet resistance, insulating properties, and falls low-moisture penetrating.Backboard generally all adopts the Film laminated of the different polymer of multilayer to form, and different like this polymer film layers can play above-mentioned different defencive function and ageing-resistant performance.
Bonding strength in the bonding strength of backboard and EVA glued membrane, backboard between different polymeric layers, and the ageing-resistant performance of the thin polymer film adopting is the key technical index that determines and affect backboard function and solar module performance.
Solar cell backboard generally comprise following which floor:
(1) fluorine plastic film (FP), the polyvinyl fluoride PVF film of DuPont company for example, trade names
the Kynoar PVDF film of Akema company, trade names
(2) ethylene glycol terephthalate (PET)
(3) EVA or TPO layer (PO)
(4) above two-layer or the adhesive phase between three layers (Tie), for example polyurethane tackifier.
Fluoropolymer back board structure can be FP/Tie/PET/Tie/EVA, FP/Tie/PET/Tie/PO, or FP/Tie/PET/Tie/FP.
Above back veneer material has adopted fluoropolymer film, although effect is good, fluoropolymer polymer is expensive, makes back veneer material holistic cost higher.In addition, fluorine material also can be to environment.
Meanwhile, the adhesive layer in above back veneer material is polyurethanes, acrylic acid (ester) class and epoxy resin equal solvent type adhesive.Use this type of adhesive to have very large shortcoming:
(1) use a large amount of dissolution with solvents adhesives, in process, solvent evaporates can produce and pollute environment, and the recovery of solvent is also increased to cost.
(2) thickness of adhesive phase is generally thinner, lower than or 10 microns of left and right, bonding strength and weatherability are poor.
(3) need independent technique that solvent type adhesive is coated on fluorine plastic film or PET film, dry except desolventizing, increase manufacturing cost.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to provide a kind of solar cell module back veneer, and the fluoroplymer layer in this solar cell module back veneer is effectively substituted, and reduces costs and reduces pollution.
For solving above technical problem, the invention provides a kind of improved solar cell module back veneer, comprise the adhesive layer of base membrane layer, base membrane layer both sides, the 4th thin layer of the another both sides of adhesive layer and the 5th thin layer, described the 4th thin layer is polyester film.
According to improved solar cell module back veneer of the present invention, be preferably, described layer 5 is polyester film, or described layer 5 material be selected from following at least one: polyester film or polyolefin POE or thermoplastic polyurethane TPU.
The polymer P OE of the olefines of layer 5 or the composition range of choice of thermoplastic polyurethane TPU are as follows:
Polyolefin POE is selected from one or more: polypropylene, maleic anhydride inoculated polypropylene, polyethylene, the copolymer of vinyl.Described polyethylene comprises with Types Below: low density polyethylene, LLDPE LLDPE, medium density polyethylene MDPE, high density polyethylene, C2-C8 alkene grafted polyethylene or with the copolymer of ethene, maleic anhydride grafted polyethylene, silane grafted polyethylene; Described ethene copolymer is the copolymer of ethene and at least one following monomer: vinylacetate, (methyl) acrylic acid C1-4 alkane ester, (methyl) acrylic acid, maleic anhydride, (methyl) glycidyl acrylate.
Described thermoplastic polyurethane TPU is formed by polyester or PPG, vulcabond and the reaction of little molecule diol chain-extension agent, can be divided into polyester-type, polyether-type.Polyester-type comprises that the adipic acids such as polybutylene glyool adipate, poly-adipate glycol butanediol ester glycol are esterdiol, and polyether-type comprises polytetrahydrofuran diol, polyoxypropyleneglycol, polybutadiene diol.
Thermoplastic polyurethane TPU can with multiple polymers blend, for example above-mentioned polyethylene and ethylene copolymer, polypropylene and modified polypropene.When adhesive layer adopts thermoplastic polyurethane material, can also with one or more polyblends of following composition: ABS (acrylic nitrile-butadiene-styrene copolymer), PC (Merlon), POM (polyformaldehyde), PVC (polyvinyl chloride), PS (polystyrene), PMA (polyacrylate), PMMA (poly-methylpropionate), mylar, SBS (polystyrene-BS), CPE (haloflex) etc.
Described vulcabond is selected from diphenyl methane-4,4 ' vulcabond MDI, and toluene di-isocyanate(TDI) TDI's is a kind of; Described chain extender is selected from BDO, 1,6-butanediol, 2-first very-1,3-PD a kind of.
When the 4th layer of laminated polyester film or layer 5 also adopt polyester film, on one or two first type surface, can there is the overlay coating of one or more layers metal level, metal oxide layer or nonmetal oxide layer, possess good moisture barrier function.For example: the PET film of aluminizing, the PET film of silica, aluminium oxide sputter or coating, thickness is at 10-250 micrometer range.
In solar cell module back veneer structure, basic structure is generally five layers, comprise base membrane layer, be bonded in the second adhesive layer and the 3rd adhesive layer of base membrane layer both sides, what the second adhesive layer opposite side was bonding is generally the 4th layer, and the 3rd adhesive layer opposite side is bonding is generally layer 5.In backboard in the past, the 4th layer usually adopted fluoroplastics material in the past, and layer 5 can adopt fluoroplastics FP or other materials.At EVA glued membrane, cell piece and front glass sheet and backboard are bonded together, generally usually the layer 5 material in backboard are directly contacted with EVA glued membrane, certainly, also backboard can be turned, with the 4th layer material, directly contact with EVA glued membrane.In the present invention, with polyester film, replace fluoroplastics.As, the 4th layer and layer 5 can adopt polyester film simultaneously, or the 4th layer adopts polyester film, and layer 5 adopts the polymer P OE of olefines or one or more in thermoplastic polyurethane TPU.
In a preferred embodiment, described polyester comprises: polyphenyl dioctyl phthalate C2-6 alkane diol ester, PETG, PTT, polybutylene terephthalate (PBT), poly terephthalic acid hexylene glycol ester, polyethylene glycol phthalate, poly-O-phthalic acid propylene glycol ester, poly-phthalic acid butanediol ester, poly-phthalic acid hexylene glycol ester; And the multiple copolymer of above binary acid and dihydroxylic alcohols and blend.
Wherein, preferably: PETG, poly-naphthalenedicarboxylic acid C2-6 alkane diol ester, for example PEN, poly-naphthalenedicarboxylic acid propylene glycol ester, PBN; And the multiple copolymer of above binary acid and dihydroxylic alcohols and blend.
The polyethylene terephtalate film of biaxial tension preferably.It is raw material that this film adopts polyester slice, through melt extruding slab, and the high performance thin film then making through the stretching of longitudinal and transverse two directions, orientation, thermal finalization and the processing such as cooling under certain process conditions.Biaxially oriented polyester film mechanical strength is high, transparent, heat resistance, gas barrier property, resistance to water, oil resistivity, resistance are moist good.
In above composition, because they all belong to petchem, there is identical ester bond structure, therefore can mix by arbitrary proportion, all can reach identical effect.
Above-mentioned polyester can add inorganic filler modifier and carry out filling-modified; Described modifier can be titanium dioxide or carbon black, also can be selected from as required other modifier.For example: add titanium dioxide, can prepare white polyester film, adding carbon black is the film of black, and titanium dioxide or carbon black have very strong ultraviolet radiation absorption effect, can improve the resistance to environmental aging performance of polyester film.
In a preferred embodiment, the upper and lower surface of described polyester film is through activation processing.
Further, described activation processing comprises: primary coat, and sided corona treatment, flame treatment, plasma treatment, silane coupler is processed, surface grafting, soda acid corrodes activation, or other activation processing modes.
According to solar cell module back veneer of the present invention, be preferably, the thickness of described the 4th layer is at 10-300 micron.Preferably, the thickness of described the 4th layer is 50-100 micron.The thickness of layer 5 is at 10-300 micrometer range, and general 20-100 micron is better.At 50-500 micrometer range, generally better at 150-250 micron at the thickness of polyester base film of the present invention.The thickness of described adhesive layer is 10-200 micron, preferably 20-100 micron.
The polyester film that base membrane layer of the present invention adopts can be any polyester rete known in the art, biaxially oriented film preferably, some of them example: polyphenyl dioctyl phthalate C2-6 alkane diol ester, as PETG (PET), PTT, polybutylene terephthalate (PBT), poly terephthalic acid hexylene glycol ester, polyethylene glycol phthalate, poly-O-phthalic acid propylene glycol ester, poly-phthalic acid butanediol ester, poly-phthalic acid hexylene glycol ester etc.PETG preferably; Poly-naphthalenedicarboxylic acid C2-6 alkane diol ester, such as PEN, poly-naphthalenedicarboxylic acid propylene glycol ester, PBN etc.; And the multiple copolymer of above-mentioned binary acid and dihydroxylic alcohols and blend.Be more preferably the polyethylene terephtalate film of biaxial tension.
Basement membrane in solar cell module back veneer of the present invention is the polyester film of single or multiple lift, and polyester film surface can be with metal, metal oxide and/or nonmetal oxide coating.The upper and lower surface of polyester film, the activation processing that can pass through various suitable methods, for example: primary coat, sided corona treatment, flame treatment, plasma treatment, silane coupler is processed, surface grafting, soda acid corrodes activation etc., but is not limited to these processing modes.
At base copolyester or independent one deck polyester film, on one or two first type surface, can there is the overlay coating of one or more layers metal level, metal oxide layer or nonmetal oxide layer, possess good moisture barrier function.For example: the PET film of aluminizing, the PET film of silica, aluminium oxide sputter or coating, thickness is at 10-250 micrometer range.
According to solar cell module back veneer of the present invention, be preferably, described adhesive layer is selected from one or more in following composition: polyethylene and ethene copolymer, polypropylene and modified polypropene, thermoplastic polyurethane, acrylic resin and ABS are resin.Above composition is all the plastic pellet of solid, unrestricted for mixed proportion, in above several large constituents, can be a kind of, can be also that Multiple components mixes with arbitrary proportion.The second adhesive layer, the 3rd adhesive layer or other adhesive layers are same composition range of choice.
Described polyethylene comprises with Types Below: low density polyethylene, LLDPE LLDPE, medium density polyethylene MDPE, high density polyethylene, C2-C8 alkene grafted polyethylene or with the copolymer of ethene, maleic anhydride grafted polyethylene, silane grafted polyethylene; Described ethene copolymer is the copolymer of ethene and at least one following monomer: vinylacetate, (methyl) acrylic acid C1-4 alkane ester, (methyl) acrylic acid, maleic anhydride, (methyl) glycidyl acrylate.
Described modified polypropene refers to modified by maleic acid anhydride graft polypropylene.
Described thermoplastic polyurethane TPU is formed by polyester or PPG, vulcabond and the reaction of little molecule diol chain-extension agent, can be divided into polyester-type, polyether-type.Polyester-type comprises that the adipic acids such as polybutylene glyool adipate, poly-adipate glycol butanediol ester glycol are esterdiol, and polyether-type comprises polytetrahydrofuran diol, polyoxypropyleneglycol, polybutadiene diol.
Thermoplastic polyurethane TPU can with multiple polymers blend, for example above-mentioned polyethylene and ethylene copolymer, polypropylene and modified polypropene, and one or more polyblends: ABS (acrylic nitrile-butadiene-styrene copolymer), PC (Merlon), POM (polyformaldehyde), PVC (polyvinyl chloride), PS (polystyrene), PMA (polyacrylate), PMMA (poly-methylpropionate), mylar, SBS (polystyrene-BS), CPE (haloflex) etc. below.
Described vulcabond is selected from diphenyl methane-4,4 ' vulcabond MDI, toluene di-isocyanate(TDI) TDI; Described chain extender is selected from BDO, 1,6-butanediol, 2-first very-1,3-PD.Described acrylic resin comprises homopolymers, the copolymer of acrylic acid, methacrylic acid and ester thereof and take acrylic resin as main blend, is mainly methyl methacrylate PMMA.
Described ABS is that resin comprises the copolymer that is selected from following at least two kinds of monomers: acrylonitrile, butadiene, styrene, (methyl) acrylic acid C1-4 alkane ester, vinyl chloride, ethene, propylene, maleic anhydride and maleimide; Also comprise that ABS is the blend of resin and other polymer.
Can also add for activating the active component of PET film surface: comprise bronsted lowry acids and bases bronsted lowry, such as NaOH or other alkaline earth metal hydroxide and boric acid, phosphoric acid, citric acid etc.; Sodium ammonium salt and naphthalene sodium salt; The tetrahalide of silicon; Borine; And some other chemical composition that comprises the functional groups such as amino, carboxyl, sulfonic group; Can add inorganic filler: titanium dioxide, silica, zinc oxide, mica, wollastonite, talcum powder, zinc sulphide, calcium carbonate, barium sulfate, tungsten carbide, boron nitride, imvite, clay, glass, molybdenum sulfide, magnesia, alundum (Al2O3) etc.
The thickness of described adhesive layer is 10-200 micron, preferably 20-100 micron.
This multi-layered polyester laminated film is used as solar cell module back veneer, typical structure is five-layer structure: PET (4)/Tie (2) //PET (1)/Tie (3)/PET or POE (5), but be not limited to the structure of five layers, the polyester film of different-thickness and function can be two-layer, more than three layers and three layers, between polyester layer, all adopt the bonding mode that second and third adhesive layer is identical.Backboard laminated construction of the present invention is generally PET/Tie/PET/Tie/PET, specific as follows:
(1) (modification) ethylene glycol terephthalate (PET) layer, hydrolysis, resistance to environmental aging;
(2) common ethylene glycol terephthalate (PET);
(3) (modification) ethylene glycol terephthalate (PET) layer, hydrolysis, resistance to environmental aging;
(4) adhesive phase of above interlayer (Tie), for example polyurethane tackifier.
The present invention also provides the production method of above-mentioned solar cell module back veneer, and in the method, one or more layers employing in described solar cell module back veneer melt extrudes technique and extrudes.
Typical structure of polyester film backboard of MULTILAYER COMPOSITE is example explanation preparation technology: (i) the second adhesive layer (2) is melt extruded to PET basement membrane (1) first surface by extruder, by the 4th layer (4), be the PET film of one deck modification, by the second adhesive layer (2) being expressed on PET basement membrane (1), be combined with each other.(ii) the 3rd adhesive layer (3) being expressed into the second surface of PET basement membrane (1), is the PET film of other one deck modification by layer 5 (5), by the 3rd adhesive layer (3) being expressed on PET basement membrane (1), is combined with each other.Make thus back board structure: PET (4)/Tie (2)/PET (1)/Tie (3)/PET (5).(iii) for another back board structure: PET (4)/Tie (2)/PET (1)/Tie (3)/POE (5), the 3rd adhesive layer (3) and layer 5 POE (5) are coextruded to the second surface of basement membrane PET (1) by two extruders, make this structure.
Between the second adhesive layer (2) and modified PET film (4), can add aluminium foil, aluminium foil is for moisture barrier, and the aluminium foil the present invention relates to is without particular limitation, can be the aluminium foil of this area routine, thickness, at 5-50 micrometer range, is generally 10-20 micron better.The second adhesive layer (2) is combined with each other aluminium foil YuPET basic unit, and between aluminium foil and the 4th layer of PET film (4), needs the 6th adhesive layer Tie (6), and material is selected identical with the first and second adhesive layers.The stack membrane that comprises aluminium foil of making is thus for the backboard of Thinfilm solar cell assembly.Adhesive layer between aluminium foil and PET (1) basic unit is processed by extruding compound mode, extrudes compound mode process in the same employing of the 4th layer of PET film (4) and the 6th adhesive layer Tie (6).The stack membrane structure of making is thus PET (4)/Tie (6)/Al (7)/Tie (2)/PET (1)/Tie (3)/PET or POE (5).
The present invention is directed to solar energy backboard, develop a kind of PET backboard, compare with back veneer material in the past, the present invention avoids using expensive fluoropolymer film, adopt multilayer PET Film laminated backboard, greatly reduce the production cost of back veneer material, meanwhile, also reduced the environmental pollution that fluorine material brings.In addition, adopted new adhesive material, new manufacturing process and adhesive bonding method have been adopted simultaneously, environmental pollution and the high problem of manufacturing cost that solvent type adhesive brings have been solved, and the PET backboard function admirable of preparing thus, compare with American-European TPT/TPE and have better air isolation performance, better anti-oxidation and moisture resistant performance, good electrical insulation capability, the Costco Wholesale of very attractive.
In solar cell backboard in the past, polyester is typically used as base membrane layer structure, utilizes its barrier property to reach air barrier effect.And because polyester has poor heat resistance performance, conventionally can not expect that with it, replacing fluoroplastic layer makes the 4th layer and layer 5 structure.The present invention looks for another way, adopt the polyester material of base membrane layer to replace fluoroplastic layer in the past, simultaneously can be further preferred, polyester is carried out to modification and replace fluoroplastic layer, the ultraviolet light performance of whole backboard not only, ageing-resistant performance promotes to some extent, and stack membrane of the present invention is by polymer melting, to extrude compound technique to prepare, because polyester plastics film fully contacts under melt state with adhesive layer mixture layer with bonding, the stronger component of polarity in adhesive layer mixture also can play the effect of activation polyester plastics film contact-making surface under melt state, thereby polyester plastics forms very strong interfacial bonding strength between layers.Through T-type, peel off test, bond strength can be up to 12N/cm left and right.
Accompanying drawing explanation
Fig. 1 is the combination schematic diagram of each layer of solar cell module back veneer of the present invention.
In figure, 1. ground floor, the 2. second layer, 3. the 3rd layer, 4. the 4th layer, 5. layer 5.Wherein, the second layer and the 3rd layer are adhesive layer, and ground floor is base membrane layer, and the 4th layer is polyester layer, and layer 5 can be polymer P OE or the thermoplastic polyurethane TPU of polyester layer or olefines.
The specific embodiment
Test method in embodiment:
1. the peel strength between PET film in solar cell module back veneer
Stack membrane is cut into 2cm wide, the batten that 10cm is long, bonding layer and basic unit are separately fixed in the upper lower clamp of stretching testing machine, peel off test, and speed is that 10cm/ divides.
2. the peel strength between solar cell module back veneer and vinyl-vinyl acetate copolymer encapsulating material
Backboard stack membrane and EVA and ultra-clear glasses, by order laying from down to up, are warming up to 145 ℃ in vacuum laminator, vacuum condition laminated 10 minutes.The sample peel manually of preparation is left, and cutting sample is 2cm width, and then 10cm length be separately fixed at glass, EVA and backboard on the upper lower clamp of measurer for pulling force, under the draw speed dividing, tests peel strength at 10cm/.
3. the hydrothermal aging of backboard test
Backboard stack membrane is placed in to a hygrothermal environment case, according to IEC 61215 standards, under 85 ℃/85% relative humidity, tests 1000 hours.Take out after sample the interlaminar strength between test PET film.
Comparative example 1
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the white ethylene glycol terephthalate PET biaxial tension of modification, 50 microns of thickness; Polyurethane solvent type adhesive, ethyl acetate is solvent.By adhesive combination process, polyurethane binder is coated on PET film, through twice applying adhesive and compound, make the Polyester multilayer membrane PET/Tie/PET/Tie/PET of following structure, wherein the thickness of adhesive is 10 microns of left and right, and the PET film on both sides is the modification white PET film of 50 micron thickness.
Test the peel strength between PET and PET in this backboard, result is 4N/cm; Peel strength after aging 1000 hours is 2N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 25N/cm.
Embodiment 1
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the white ethylene glycol terephthalate PET biaxial tension of modification, 50 microns of thickness; Adopt LLDPE LLDPE plastic pellet and silane coupler 1%, ethylene-propylene acid butyl ester EBA30% and light stabilizer, age resister 0.5% by double screw extruder mixing granulation, obtain LLDPE mixture.LLDPE is melt extruded to the PET film after 200 microns by extruder, compound with the white modified PET of 50 microns of thickness again, make the Polyester multilayer membrane PET/LLDPE/PET/LLDPE/PET of following structure, wherein the thickness of adhesive layer is 20 microns of left and right, and the PET film on both sides is the modification white PET film of 50 micron thickness.
Test the peel strength between PET and PET in this backboard, result is 12N/cm; The peel strength of hydrothermal aging after 1000 hours is 11N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 25N/cm.
Embodiment 2
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the white ethylene glycol terephthalate PET biaxial tension of modification, 50 microns of thickness; Adopt LLDPE LLDPE plastic pellet and silane coupler 1%, ethylene-propylene acid butyl ester EBA30% and light stabilizer, age resister 0.5% by double screw extruder mixing granulation, obtain LLDPE mixture.LLDPE is melt extruded to the PET film after 200 microns by extruder, more compound with the white modified PET of 50 microns of thickness.And then another surface of the PET film of 200 microns of thickness, by extruding coating LLDPE, 100 microns of thickness, make the Polyester multilayer membrane PET/LLDPE/PET/LLDPE of following structure, wherein the thickness of adhesive layer is 20 microns of left and right, PET film is on one side the modification white PET film of 50 micron thickness, and another side is LLDPE layer.
Test the peel strength between PET and PET in this backboard, result is 12N/cm; The peel strength of hydrothermal aging after 1000 hours is 11N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 65N/cm.
Embodiment 3
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the white ethylene glycol terephthalate PET biaxial tension of modification, 50 microns of thickness; Adopt extrusion grade thermoplastic polyurethane, by extruder, melt extrude to the PET film of 200 micron thickness, more compound with the white modified PET of 50 microns of thickness.Opposite side at the PET of 200 micron thickness film, extrude coating thermoplastic polyurethane, compound with the white modified PET of 50 microns of other a layer thickness again, make the Polyester multilayer membrane PET/TPU/PET/TPU/PET of following structure, wherein the thickness of adhesive layer is 20 microns of left and right, and the PET film on both sides is the modification white PET film of 50 micron thickness.
Test the peel strength between PET and PET in this backboard, result is 10N/cm; The peel strength of hydrothermal aging after 1000 hours is 9N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 25N/cm.
Embodiment 4
The 4th strata ester adopts PTT, and thickness is 120 microns, and film upper and lower surface adopts plasma treatment.Layer 5 material adopts polypropylene and medium density polyethylene MDPE (mass ratio of 1: 1 mixes).
Test the peel strength between PET and PET in this backboard, result is 11N/cm; The peel strength of hydrothermal aging after 1000 hours is 11N/cm.Other are with embodiment 2.
Embodiment 5
The 4th strata ester adopts poly-phthalic acid butanediol ester, and thickness is 200 microns, and polyester film upper and lower surface adopts sided corona treatment; Layer 5 material adopts thermoplastic polyurethane TPU.
Test the peel strength between PET and PET in this backboard, result is 10N/cm; The peel strength of hydrothermal aging after 1000 hours is 9N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 25N/cm.
Other are with embodiment 1.
Embodiment 6
The 4th strata ester adopts polyphenyl dioctyl phthalate glycol ester, and thickness is 80 microns, adopts carbon black modified; Layer 5 material adopts poly-benzene dicarboxylic acid butanediol ester.
Test the peel strength between PET and PET in this backboard, result is 11N/cm; The peel strength of hydrothermal aging after 1000 hours is 10N/cm.
Other are with embodiment 1.
Embodiment 7
The 4th strata ester adopts the copolymer of mutual-phenenyl two acid bromide two alcohol ester and ethylene glycol terephthalate, adopts carbon black modifiedly, and thickness is 50 microns; Layer 5 adopts ethylene-methyl methacrylate polymer.
Test the peel strength between PET and PET in this backboard, result is 11N/cm; The peel strength of hydrothermal aging after 1000 hours is 10N/cm.
This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 23N/cm.
Other are with embodiment 1.
By above-mentioned comparative example and several embodiment, can be found out, adopting polyethylene mixture or thermoplastic polyurethane is adhesive layer, by melt extruding compound mode, the PET film of different-thickness and function is effectively bonded together, avoid use solvent type adhesive completely, solved the volatilization of organic solvent and the problem of environmental pollution that discharge brings.
Claims (1)
1. an improved solar cell module back veneer, is characterized in that described solar cell module back veneer adopts following method to be prepared from:
Adopt the film of common polyethylene terephtalate biaxial tension, 200 microns of thickness; The film of the white polyethylene terephtalate biaxial tension of modification, 50 microns of thickness; Adopt extrusion grade thermoplastic polyurethane, by extruder, melt extrude to the PET film of 200 micron thickness, more compound with the white modified PET of 50 microns of thickness; Opposite side at the PET of 200 micron thickness film, extrude coating thermoplastic polyurethane, compound with the white modified PET of 50 microns of other a layer thickness again, make the Polyester multilayer membrane PET/TPU/PET/TPU/PET of following structure, wherein the thickness of adhesive layer TPU is 20 microns, and the PET film on both sides is the modification white PET film of 50 micron thickness; Test the peel strength between PET and PET in this backboard, result is 10N/cm, and the peel strength of hydrothermal aging after 1000 hours is 9N/cm; This backboard and EVA and glass are made sample by vacuum lamination process, test the peel strength between this backboard and EVA encapsulated layer, and result is 25N/cm.
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| CN201010512999.XA CN102529258B (en) | 2010-10-20 | 2010-10-20 | Improved solar cell assembly back plate and manufacturing method thereof |
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| CN201010512999.XA CN102529258B (en) | 2010-10-20 | 2010-10-20 | Improved solar cell assembly back plate and manufacturing method thereof |
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| CN102529258A CN102529258A (en) | 2012-07-04 |
| CN102529258B true CN102529258B (en) | 2014-10-29 |
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| CN117048164B (en) * | 2023-10-11 | 2024-01-26 | 畅的新材料科技（上海）有限公司 | High-weather-resistance photovoltaic backboard base film and preparation method thereof |
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Address after: Suzhou District of Suzhou city in Jiangsu Province Jian Lin Road 215151 No. 666 Patentee after: DSM shangshasn solar technology (Suzhou) Co., Ltd. Address before: Suzhou District of Suzhou city in Jiangsu Province Jian Lin Road 215151 No. 666 Patentee before: Suzhou Shangshan New Material Technology Co., Ltd. |
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Address after: No. 666, Jianlin Road, Suzhou New Area, Suzhou, Jiangsu 215151 Patentee after: Yingrun Shangshan solar energy technology (Suzhou) Co.,Ltd. Address before: No. 666, Jianlin Road, Suzhou New Area, Suzhou, Jiangsu 215151 Patentee before: SUZHOU SUNSHINE NEW MATERIALS TECHNOLOGY CO.,LTD. |