CN102529258A - 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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- CN102529258A CN102529258A CN201010512999XA CN201010512999A CN102529258A CN 102529258 A CN102529258 A CN 102529258A CN 201010512999X A CN201010512999X A CN 201010512999XA CN 201010512999 A CN201010512999 A CN 201010512999A CN 102529258 A CN102529258 A CN 102529258A
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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 manufacturing approach thereof, be specifically related to a kind of solar cell module back veneer of environment-friendly type.
Background technology
Human present main energy sources is from fossil energy; Comprise oil, coal and natural gas, but the time in following about 100 years, fossil energy meeting approach exhaustion; And in the process of using 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 human energy challenge 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 the 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, mainly is the support and everybody craving for green regenerative energy sources that has benefited from government.
But; Also there is very big challenge at present in solar cell power generation, mainly is that the cost of electricity-generating of solar cell also is higher than the cost that traditional fossil generates electricity, in addition; In the manufacturing process of solar cell and assembly, there are some technologies to have problem of environmental pollution well.The development challenge of solar cell power generation is design and the preparation that how improves present solar cell and assembly manufacturing process and associated materials through technological innovation, avoids the pollution to environment, and continues to reduce the cost of solar electrical energy generation.
Solar cell power generation technologies include crystalline silicon solar cells and thin-film solar cells, crystalline silicon solar cells including silicon and polysilicon are two thin-film solar cell includes: an amorphous silicon, microcrystalline silicon, copper indium gallium selenide, cadmium telluride dye-sensitized organic and other types.No matter be which kind of solar cell, all need be prepared into solar module, semi-conductive battery is effectively protected and encapsulated, generating that could be permanently effective.With the crystal silicon solar battery component is example; General preceding half as assembly of low iron ultra-clear glasses about 3mm that adopt is encapsulating material with the glued membrane of ethylene-vinyl acetate EVA, places the both sides up and down of battery sheet respectively; Multilayer laminated film with polymer is a backboard; Under 140-150 ℃ of condition, process assembly through vacuum lamination process, the EVA glued membrane is bonded together battery sheet and preceding glass sheet and backboard.Solar module encapsulating material commonly used in addition is the polythene material of polyvinyl butyral resin PVB and silane grafting, or other material.
Sunshine glass sheet is in the past injected, and passes the EVA glued membrane and arrives solar battery sheet, changes into electric energy.So the transmitance of glass is very important, guarantee that enough light incides the battery sheet.The function of backboard mainly is protection EVA glued membrane and battery sheet, guarantees integrality, hydrolytic resistance, ultraviolet resistance, the insulating properties of machinery, and reduces penetrating of moisture.Backboard generally all adopts the film of multilayer various polymerization thing to be composited, and the different polymer thin layer can play above different defencive functions and the ageing-resistant performance of mentioning like this.
The bonding strength of various polymerization thing interlayer in the bonding strength of backboard and EVA glued membrane, the backboard, and the ageing-resistant performance of the thin polymer film that is adopted is decision and the key technical index that influences 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; The Kynoar PVDF film of trade names
Akema company, trade names
(2) ethylene glycol terephthalate (PET)
(3) EVA or TPO layer (PO)
(4) two-layer or the adhesive phase between three layers (Tie), for example polyurethane tackifier more than.
The fluoropolymer back board structure can be FP/Tie/PET/Tie/EVA, FP/Tie/PET/Tie/PO, perhaps FP/Tie/PET/Tie/FP.
Above back veneer material has adopted fluoropolymer film, though effect is good, fluoropolymer polymer costs an arm and a leg, and makes that the whole cost of back veneer material is higher.In addition, the fluorine material also can pollute environment.
Simultaneously, the adhesive layer in the above back veneer material is a polyurethanes, acrylic acid (ester) class and epoxy resin equal solvent type adhesive.Use this type of adhesive that very big shortcoming is arranged:
(1) use a large amount of dissolution with solvents adhesives, solvent evaporates can produce environment and pollute in process, and the recovery of solvent is also increased cost.
(2) thickness of adhesive phase is generally thinner, is lower than or about 10 microns, bonding strength and weatherability are poor.
(3) need independent technology that solvent type adhesive is coated on fluorine plastic film or the PET film, dry removing desolvated, and increases manufacturing cost.
Summary of the invention
Therefore, the technical problem that the present invention will solve provides a kind of solar cell module back veneer, and fluoroplymer layer in this solar cell module back veneer is effectively substituted, and reduces cost 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, adhesive layer is the 4th thin layer and the 5th thin layer of both sides in addition, and said the 4th thin layer is a polyester film.
According to improved solar cell module back veneer of the present invention, be preferably, said layer 5 is a polyester film, or said layer 5 material is selected from following at least a: 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 following:
Polyolefin POE is selected from one or more: polypropylene, maleic anhydride inoculated polypropylene, polyethylene, the copolymer of vinyl.Said polyethylene comprises following type: 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; Said ethene copolymer is the copolymer of ethene and at least a following monomer: vinylacetate, (methyl) acrylic acid C1-4 alkane ester, (methyl) acrylic acid, maleic anhydride, (methyl) glycidyl acrylate.
Said 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 the poly adipate succinic acid ester glycol, gathers adipic acids such as adipate glycol butanediol ester glycol is esterdiol, and polyether-type comprises polytetrahydrofuran diol, polyoxypropyleneglycol, polybutadiene diol.
Thermoplastic polyurethane TPU can with multiple polymers blend, polyethylene and ethylene copolymer, polypropylene and the modified polypropene mentioned more than for example.When adhesive layer adopts the thermoplastic polyurethane material, can also with one or more polyblends of following composition: ABS (polyacrylonitrile-BS), PC (Merlon), POM (polyformaldehyde), PVC (polyvinyl chloride), PS (polystyrene), PMA (polyacrylate), PMMA (gathering methylpropionate), mylar, SBS (polystyrene-BS), CPE (haloflex) etc.
Said vulcabond is selected from diphenyl methane-4,4 ' vulcabond MDI, and toluene di-isocyanate(TDI) TDI's is a kind of; Said chain extender is selected from 1, the 4-butanediol, 1, the 6-butanediol, the 2-first very-1, ammediol a kind of.
When the 4th strata ester film layer or layer 5 also adopt polyester film, the overlay coating of one or more layers metal level, metal oxide layer or nonmetal oxide layer can be arranged on one or two first type surface, 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 the 10-250 micrometer range.
In the solar cell module back veneer structure; Basic structure is generally five layers; Comprise base membrane layer, be bonded in 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 the backboard in the past, the 4th layer was usually adopted the fluoroplastics material in the past, and layer 5 can adopt fluoroplastics FP or other materials.At the EVA glued membrane battery sheet and preceding glass sheet and backboard are bonded together, generally usually the layer 5 material in the backboard are directly contacted with the EVA glued membrane, certainly, also can backboard be turned, directly contact with the EVA glued membrane with the 4th layer material.In the present invention, replace fluoroplastics with polyester film.As, the 4th layer can be adopted polyester film simultaneously with layer 5, and perhaps, the 4th layer is adopted polyester film, and layer 5 adopts the polymer P OE of olefines or among the thermoplastic polyurethane TPU one or more.
In a preferred embodiment; Said polyester comprises: polyphenyl dioctyl phthalate C2-6 alkane diol ester, PETG, PTT, polybutylene terephthalate (PBT), poly terephthalic acid hexylene glycol ester, polyethylene glycol phthalate, gather the O-phthalic acid propylene glycol ester, gather the phthalic acid butanediol ester, gather phthalic acid hexylene glycol ester; And the multiple copolymer of above binary acid and dihydroxylic alcohols and blend.
Wherein, preferably: PETG, gather naphthalenedicarboxylic acid C2-6 alkane diol ester, for example PEN, gather 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 the casting sheet, and the high performance thin film that under certain process conditions, makes then through processing such as stretching, orientation, thermal finalization and the cooling of longitudinal and transverse two directions.Biaxially oriented polyester film mechanical strength height, the transparency, hear resistance, gas barrier property, resistance to water, oil resistivity, resistance are moist good.
In above composition, because they all belong to petchem, have 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; Said modifier can be titanium dioxide or carbon black, also can be selected from other modifier as required.For example: add titanium dioxide, can prepare the polyester film of white, adding carbon black then is the film of black, and titanium dioxide or carbon black all have very strong ultraviolet radiation absorption effect, can improve the anti-environmental aging performance of polyester film.
In a preferred embodiment, the upper and lower surfaces of said polyester film is through activation processing.
Further, said activation processing comprises: primary coat, and corona treatment, flame treatment, plasma treatment, silane coupler is handled, surface grafting, soda acid corrodes activation, perhaps other activation processing modes.
According to solar cell module back veneer of the present invention, be preferably, said the 4th layer thickness is at the 10-300 micron.Preferably, said the 4th layer thickness is the 50-100 micron.The thickness of layer 5 is at the 10-300 micrometer range, and general 20-100 micron is better., generally better at the thickness of polyester basement membrane according to the invention at the 150-250 micron at the 50-500 micrometer range.The thickness of said adhesive layer is the 10-200 micron, preferably the 20-100 micron.
The polyester film that base membrane layer of the present invention adopts can be any polyester rete known in the art; Be preferably biaxially oriented film; The some of them instance: polyphenyl dioctyl phthalate C2-6 alkane diol ester, like PETG (PET), PTT, polybutylene terephthalate (PBT), poly terephthalic acid hexylene glycol ester, polyethylene glycol phthalate, gather the O-phthalic acid propylene glycol ester, gather the phthalic acid butanediol ester, gather phthalic acid hexylene glycol ester etc.Be preferably PETG; Gather naphthalenedicarboxylic acid C2-6 alkane diol ester, for example PEN, gather naphthalenedicarboxylic acid propylene glycol ester, PBN etc.; And more than the binary acid mentioned and the multiple copolymer and the blend of dihydroxylic alcohols.Be more preferably the polyethylene terephtalate film of biaxial tension.
Basement membrane in the solar cell module back veneer of the present invention is the polyester film of single or multiple lift, and polyester film surface can have metal, metal oxide and/or nonmetal oxide coating.The upper and lower surfaces of polyester film, the activation processing that can pass through various suitable methods, for example: primary coat, corona treatment, flame treatment, plasma treatment, silane coupler is handled, surface grafting, soda acid corrodes activation etc., but is not limited to these processing modes.
At base copolyester or independent one deck polyester film, the overlay coating of one or more layers metal level, metal oxide layer or nonmetal oxide layer can be arranged on one or two first type surface, 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 the 10-250 micrometer range.
According to solar cell module back veneer of the present invention; Be preferably, said adhesive layer is selected from one or more in the following composition: polyethylene and ethene copolymer, polypropylene and modified polypropene, thermoplastic polyurethane, acrylic resin and ABS are resin.Above composition all is the plastic pellet of solid, and is unrestricted for mixed proportion, more than can be a kind of in several big constituents, also can be that multiple composition mixes with arbitrary proportion.Second adhesive layer, the 3rd adhesive layer or other adhesive layers are same composition range of choice.
Said polyethylene comprises following type: 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; Said ethene copolymer is the copolymer of ethene and at least a following monomer: vinylacetate, (methyl) acrylic acid C1-4 alkane ester, (methyl) acrylic acid, maleic anhydride, (methyl) glycidyl acrylate.
Said modified polypropene is meant the modified by maleic acid anhydride graft polypropylene.
Said 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 the poly adipate succinic acid ester glycol, gathers adipic acids such as adipate glycol butanediol ester glycol is esterdiol, and polyether-type comprises polytetrahydrofuran diol, polyoxypropyleneglycol, polybutadiene diol.
Thermoplastic polyurethane TPU can with the multiple polymers blend; Polyethylene of mentioning for example and ethylene copolymer; Polypropylene and modified polypropene, and following one or more polyblends: ABS (polyacrylonitrile-BS), PC (Merlon), POM (polyformaldehyde), PVC (polyvinyl chloride), PS (polystyrene), PMA (polyacrylate), PMMA (gathering methylpropionate), mylar, SBS (polystyrene-BS), CPE (haloflex) etc.
Said vulcabond is selected from diphenyl methane-4,4 ' vulcabond MDI, toluene di-isocyanate(TDI) TDI; Said chain extender is selected from 1, the 4-butanediol, 1, the 6-butanediol, the 2-first very-1, ammediol.Said acrylic resin comprises the homopolymers, copolymer of acrylic acid, methacrylic acid and ester thereof and is main blend with the acrylic resin, mainly is methyl methacrylate PMMA.
Said 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; Comprise that also ABS is the blend of resin and other polymer.
Can also add the active component that is used to activate the PET film surface: comprise bronsted lowry acids and bases bronsted lowry, for example 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 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 (Al or the like.
The thickness of said adhesive layer is the 10-200 micron, preferably the 20-100 micron.
This multi-layered polyester laminated film is used as solar cell module back veneer; Typical structure be five-layer structure: PET (4)/Tie (2) //PET (1)/Tie (3)/PET or POE (5); But be not limited to five layers structure; The polyester film of different-thickness and function can be two-layer, more than three layers and three layers, all adopt the identical bonding mode of second and third adhesive layer between the polyester layer.Backboard laminated construction of the present invention generally is PET/Tie/PET/Tie/PET, and is specific as follows:
(1) (modification) ethylene glycol terephthalate (PET) layer, hydrolysis, anti-environmental aging;
(2) common ethylene glycol terephthalate (PET);
(3) (modification) ethylene glycol terephthalate (PET) layer, hydrolysis, anti-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 this method, one or more layers employing in the said solar cell module back veneer melt extrudes technology and extrudes.
Typical structure of the polyester film backboard of MULTILAYER COMPOSITE is example explanation preparation technology: (i) second adhesive layer (2) is melt extruded to PET basement membrane (1) first surface through extruder; With the 4th layer (4) is the PET film of one deck modification, is combined with each other through second adhesive layer (2) that is expressed on the PET basement membrane (1).(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 with layer 5 (5), is combined with each other through the 3rd adhesive layer (3) that is expressed on the PET basement membrane (1).Process back board structure: PET (4)/Tie (2)/PET (1)/Tie (3)/PET (5) thus.(iii) for other a kind of 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) through two extruders, process this structure.
Between second adhesive layer (2) and modified PET film (4), can add aluminium foil, aluminium foil is used for moisture barrier, and the aluminium foil that the present invention relates to does not have special restriction, can be the conventional aluminium foil in this area, and thickness is at the 5-50 micrometer range, and it is better to be generally the 10-20 micron.Second adhesive layer (2) is combined with each other aluminium foil and PET 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 first and second adhesive layers.The stack membrane of processing thus that comprises aluminium foil is used for the backboard of Thinfilm solar cell assembly.Adhesive layer between aluminium foil and PET (1) basic unit is processed through extruding compound mode, extrudes compound mode in the same employing of the 4th layer of PET film (4) and the 6th adhesive layer Tie (6) and processes.The stack membrane structure of processing thus is PET (4)/Tie (6)/Al (7)/Tie (2)/PET (1)/Tie (3)/PET or POE (5).
The present invention is directed to the solar energy backboard; Develop a kind of PET backboard, compare with back veneer material in the past, the present invention avoids the use of expensive fluoropolymer film; Adopt the compound backboard of multilayer PET film; Greatly reduce the production cost of back veneer material, simultaneously, also reduced the environmental pollution that the fluorine material is brought.In addition, adopt new adhesive material, adopted new manufacturing process and adhesive bonding method 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 preparation thus, to compare with American-European TPT/TPE and to have better air isolation performance, better anti-oxidation and moisture resistance can; The excellent electric insulating ability, the Costco Wholesale of very attractive.
In solar cell backboard in the past, polyester as the base membrane layer structure, utilizes its barrier property to reach the air barriering effect usually.And, can not expect that usually replacing fluoroplastic layer with it makes the 4th layer and layer 5 structure because polyester has the poor heat resistance performance.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 modification replace fluoroplastic layer, not only ultraviolet light performance, the ageing-resistant performance of whole back plate promote to some extent; And stack membrane of the present invention is to melt extrude compound prepared through polymer; Because the polyester plastics film fully contacts under melt state with bonding with the adhesive layer mixture layer, the component that the polarity in the adhesive layer mixture is stronger also can play the effect of activation polyester plastics film contact-making surface under melt state, thereby forms very strong interfacial bonding strength between polyester plastics layer and the layer.Peel off test through the T-type, bond strength can be up to about 12N/cm.
Description of drawings
Fig. 1 is the combination sketch map of each layer of solar cell module back veneer of the present invention.
Among the 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 a base membrane layer, and the 4th layer is polyester layer, and layer 5 can be the polymer P OE or the thermoplastic polyurethane TPU of polyester layer or olefines.
The specific embodiment
Test method among the embodiment:
1. the peel strength between the PET film in the solar cell module back veneer
It is wide that stack membrane is cut into 2cm, the batten that 10cm is long, and knitting layer and basic unit are separately fixed in the last lower clamp of stretching testing machine, peel off test, and speed is the 10cm/ branch.
2. the peel strength between solar cell module back veneer and the vinyl-vinyl acetate copolymer encapsulating material
Backboard stack membrane and EVA and ultra-clear glasses by from down to up order shop layer, 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 the 2cm width, and 10cm length is separately fixed at glass, EVA and backboard on the last lower clamp of tensile test machine then, test peel strength under the draw speed that 10cm/ divides.
3. the hydrothermal aging of backboard test
The backboard stack membrane is placed a hygrothermal environment case, under 85 ℃/85% relative humidity, tested 1000 hours according to IEC 61215 standards.After taking out sample, the interlaminar strength between the 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 ethylene glycol terephthalate PET biaxial tension of the white of modification, 50 microns of thickness; Polyurethane solvent type adhesive, ethyl acetate are solvent.Through the adhesive combination process; Polyurethane binder is coated on the PET film; Through twice adhesive coating and compound; Process the Polyester multilayer membrane PET/Tie/PET/Tie/PET of following structure, wherein the thickness of adhesive is about 10 microns, and the PET film on both sides is the modification white PET film of 50 micron thick.
Test the peel strength between the PET and PET in this backboard, the result is 4N/cm; Aging peel strength after 1000 hours is 2N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the result is 25N/cm.
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the ethylene glycol terephthalate PET biaxial tension of the white 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% through the double screw extruder mixing granulation, obtain the LLDPE mixture.LLDPE is melt extruded on the PET film after 200 microns through extruder; Compound with the white modified PET of 50 microns of thickness again; Process the Polyester multilayer membrane PET/LLDPE/PET/LLDPE/PET of following structure; Wherein the thickness of adhesive layer is about 20 microns, and the PET film on both sides is the modification white PET film of 50 micron thick.
Test the peel strength between the PET and PET in this backboard, the result is 12N/cm; The peel strength of hydrothermal aging after 1000 hours is 11N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the result is 25N/cm.
Adopt the film of common ethylene glycol terephthalate PET biaxial tension, 200 microns of thickness; The film of the ethylene glycol terephthalate PET biaxial tension of the white 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% through the double screw extruder mixing granulation, obtain the LLDPE mixture.LLDPE is melt extruded on the PET film after 200 microns through extruder, compound with the white modified PET of 50 microns of thickness again.And then another surface of the PET film of 200 microns of thickness; Apply LLDPE through extruding; 100 microns of thickness are processed the Polyester multilayer membrane PET/LLDPE/PET/LLDPE of following structure, and wherein the thickness of adhesive layer is about 20 microns; PET film on one side is the modification white PET film of 50 micron thick, and another side is the LLDPE layer.
Test the peel strength between the PET and PET in this backboard, the result is 12N/cm; The peel strength of hydrothermal aging after 1000 hours is 11N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the 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 ethylene glycol terephthalate PET biaxial tension of the white of modification, 50 microns of thickness; Adopt the extrusion grade thermoplastic polyurethane, melt extrude to the PET film of 200 micron thick through extruder, compound with the white modified PET of 50 microns of thickness again.Opposite side at the PET of 200 micron thick film; Extrude the coating thermoplastic polyurethane; Compound with the white modified PET of 50 microns of other layer thicknesses again; Process the Polyester multilayer membrane PET/TPU/PET/TPU/PET of following structure, wherein the thickness of adhesive layer is about 20 microns, and the PET film on both sides is the modification white PET film of 50 micron thick.
Test the peel strength between the PET and PET in this backboard, the result is 10N/cm; The peel strength of hydrothermal aging after 1000 hours is 9N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the result is 25N/cm.
Embodiment 4
The 4th strata ester adopts PTT, and thickness is 120 microns, and the film upper and lower surfaces adopts plasma treatment.The layer 5 material adopts polypropylene and medium density polyethylene MDPE (1: 1 mass ratio mixes).
Test the peel strength between the PET and PET in this backboard, the 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 and gathers the phthalic acid butanediol ester, and thickness is 200 microns, and the polyester film upper and lower surfaces adopts corona treatment; The layer 5 material adopts thermoplastic polyurethane TPU.
Test the peel strength between the PET and PET in this backboard, the result is 10N/cm; The peel strength of hydrothermal aging after 1000 hours is 9N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the 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; The layer 5 material adopts polyphenyl dioctyl phthalate butanediol ester.
Test the peel strength between the PET and PET in this backboard, the 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 the ethylene-methyl methacrylate polymer.
Test the peel strength between the PET and PET in this backboard, the result is 11N/cm; The peel strength of hydrothermal aging after 1000 hours is 10N/cm.
This backboard and EVA and glass are processed sample through vacuum lamination process, test the peel strength between this backboard and the EVA encapsulated layer, and the result is 23N/cm.
Other are with embodiment 1.
Can find out by above-mentioned comparative example and several embodiment; Adopting polyethylene mixture or thermoplastic polyurethane is adhesive layer; Through melt extruding compound mode; The PET film of different-thickness and function effectively is bonded together, has avoided the use solvent type adhesive fully, solved the volatilization of organic solvent and the problem of environmental pollution that discharging brings.
Claims (12)
1. improved solar cell module back veneer comprises the adhesive layer of base membrane layer, base membrane layer both sides, and adhesive layer is the 4th thin layer and the 5th thin layer of both sides in addition, and it is characterized in that: said the 4th thin layer is a polyester film.
2. improved solar cell module back veneer according to claim 1 is characterized in that: said layer 5 is a polyester film, or said layer 5 material is selected from following at least a: polyester film or polyolefin POE or thermoplastic polyurethane TPU.
3. improved solar cell module back veneer according to claim 1 and 2; It is characterized in that: said polyester comprises: polyphenyl dioctyl phthalate C2-6 alkane diol ester, PETG, PTT, polybutylene terephthalate (PBT), poly terephthalic acid hexylene glycol ester, polyethylene glycol phthalate, gather the O-phthalic acid propylene glycol ester, gather the phthalic acid butanediol ester, gather phthalic acid hexylene glycol ester; And the multiple copolymer of above binary acid and dihydroxylic alcohols and blend.
4. according to each described improved solar cell module back veneer of claim 3, it is characterized in that: said polyester comprises: PETG, gather naphthalenedicarboxylic acid C2-6 alkane diol ester; And the multiple copolymer of above binary acid and dihydroxylic alcohols and blend.
5. improved solar cell module back veneer according to claim 1 is characterized in that: said polyester adds inorganic filler and carries out filling-modified.
6. improved solar cell module back veneer according to claim 1 is characterized in that: the upper and lower surfaces of said polyester film is through activation processing.
7. improved solar cell module back veneer according to claim 6 is characterized in that: said activation processing comprises: primary coat, and corona treatment, flame treatment, plasma treatment, silane coupler is handled, surface grafting, soda acid corrodes activation.
8. improved solar cell module back veneer according to claim 1 is characterized in that: said the 4th layer thickness is at the 10-300 micron.
9. improved solar cell module back veneer according to claim 8 is characterized in that: said the 4th layer thickness is the 50-100 micron.
10. improved solar cell module back veneer according to claim 1 is characterized in that, said base membrane layer is a polyester film.
11. improved solar cell module back veneer according to claim 1 is characterized in that: said adhesive layer is selected from one or more in the following composition: polyethylene and ethene copolymer, polypropylene and modified polypropene, thermoplastic polyurethane, acrylic resin and ABS are resin.
12. the production method of the said improved solar cell module back veneer of claim 1 is characterized in that: one or more layers employing in the said solar cell module back veneer melt extrudes technology and extrudes.
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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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