CN101605657B - Backing sheet for photovoltaic and method for repairing same - Google Patents

Backing sheet for photovoltaic and method for repairing same Download PDF

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Publication number
CN101605657B
CN101605657B CN200880002193.7A CN200880002193A CN101605657B CN 101605657 B CN101605657 B CN 101605657B CN 200880002193 A CN200880002193 A CN 200880002193A CN 101605657 B CN101605657 B CN 101605657B
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China
Prior art keywords
backboard
layer
polyester
lamination
fluorinated copolymer
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CN200880002193.7A
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CN101605657A (en
Inventor
玛丽娜·塔姆申科
大卫·威廉·埃维森
弗兰克·安东尼·曼纳里诺
赛缪尔·林
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Madico Inc
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Madico Inc
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Priority claimed from US12/011,962 external-priority patent/US20080264484A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0216Coatings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/048Encapsulation of modules
    • H01L31/049Protective back sheets
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Laminated Bodies (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The present invention provides a protective backing sheet for photovoltaic modules. The backing sheets of the current invention possess excellent weather resistance, heat resistance, color retention, adhesion between layers and encapsulant, and scratch resistance. The backing sheet can minimize the deterioration in the performance of the solar module due to moisture permeation. It also can achieve desirable photoelectric conversion efficiency over a long period of time. Additionally the described backing sheet, or alternately referred to backskin, can be made in an aesthetically pleasing form.

Description

The backboard of photovoltaic module and keep in repair the method for this backboard
Background of invention
Description of Related Art
The solar energy that photovoltaic module uses is one of most promising alternative energy source of oil, and in this century, oil is just depleted.But, to produce and the process of installation photovoltaic component remains costliness.Typical photovoltaic module is made up of the protective seal at the transparent front sheet of glass or flexibility, solar cell, sealant, protectiveness backboard, covering assemblies edge and the aluminum frame that covers sealing.As shown in Figure 1, front panel 10, backboard 20 and sealant 30 and 30 ' are designed to protect the impact of array 40 not climate factor, humidity, mechanical load and impact.And these parts provide the electrical isolation for personal security and electric leakage.Protectiveness backboard 20 is intended to the service life and the efficiency that improve photovoltaic module, thus reduces the unit power cost of photovoltaic electric current.In order to realize the Transmission light of height, front panel 10 and sealant 30 and 30 ' must be transparent, but must be highly opaque to obtain backboard attractive in appearance, and must have highly reflective for functional object backboard.For a lot of reasons, expect that solar module is frivolous, these reasons comprise and are particularly useful for building (with the photovoltaic (PV) of building one) and the weight applied of space reduces, and Military Application (be combined in soldier's equipment etc. in).In addition, frivolous element assists is in reducing costs.The reduction of the quantity of material used also makes this technology " green " more, thus has saved more natural resources.
The present arrangements manufacturing frivolous solar cell is in conjunction with frivolous backboard.But back cladding material also must have certain moisture resistance and infiltrate to prevent moisture and water, and the capped parts of such as photovoltaic element, wire and electrode may be caused to get rusty for the infiltration of moisture and water and solar cell damages.In addition, backboard should provide electrical isolation, mechanical protection, certain ultraviolet (UV) stability, to the tack of sealant and the ability connecting output line.
The protectiveness backboard normally laminated product of current use.Fig. 2 provides the diagram of typical laminate backing sheet 20.Lamination by as the most common of critical component is polyvinyl fluoride rete 22, polyester (PET) rete 24 and ethene-vinyl acetate (EVA) copolymer rete 26 form.EVA layer 26 bonds with the sealant layer 30 in assembly and is used as dielectric layer, and EVA layer 26 has good moisture barrier characteristics.The size of this EVA is stable.White EVA makes power significantly improve.Polyester layer 24 is very firm, has excellent dielectricity, dimensionally stable, and also has good moisture barrier characteristics.Polyvinyl fluoride layer 22 is used as very weather-proof layer.
Even if these retes have met the performance standard in the actual use procedure of required test neutralization, but still there is some limitation, as high in cost and acquisition rete is restricted.Such as PVF eCTFE at the temperature that cannot raise in environment temperature or appropriateness, such material is processed with another shortcoming of the material of the prior art of other fluoropolymer.Such as, use high boiler (usually, to orientation use dimethyl acetamide, right sP uses propene carbonate) make PVF rete by casting technique by diffusion.The boiling point of dimethyl acetamide is 164-166 DEG C, and the boiling point of propene carbonate is 200 DEG C.Must 160 DEG C and 90% or higher solvent under spread.Due to the thermal instability of PVF resin, higher temperature can not be accepted: the melting Sum decomposition temperature of PVF resin too close to such an extent as to PVF can decompose in the process of curing.Therefore, exist there is residual solvent in rete always.DuPont is reported in all orientations dimethylacetylamide (DMAC) residual quantity of 0.05wt% to 1.0wt% is there is in PVF rete.
Or, ECTFE rete is made by melt extruding technique at 350 DEG C-375 DEG C.Therefore, ECTFE rete can not easily mix with pigment, clay etc., and this rete is also expensive.
5th, 741, No. 370 United States Patent (USP)s propose, manufacture and assembly installation cost can be reduced by thermoplastic olefin is used as backsheet material, described thermoplastic olefin comprises two kinds of different ionomeric combinations, the such as combination of sodium ionomer and zinc ionomer, and this combination is described to produce synergy, and the water vapor barrier property of back veneer material is increased on the barrier properties of any single ionomer component by described synergy.This patent also discloses the use of the ionomer encapsulant with two ionomer tergite.
But National Renewable Energy laboratory (NREL) report, ionomer resin comprises methacrylic acid that is free and that combine, and its needs use stainless steel instrument in melt-processed process, thus add manufacturing cost.PVMaT in the subcontract report of Solarex photovoltaic module manufacturing technology year improves (PVMaT Improvements in the Solarex PhotovoltaicModule Manufacturing Technology Annual Subcontract Report), on April 30 ,-1999 years on the 5th May in 1998, National Renewable Energy Laboratory, in January, 2000 NREL/SR-520-27643.
Technical field
The present invention relates to photovoltaic module.More specifically, the present invention relates to protectiveness backboard.
Summary of the invention
The invention provides the protectiveness backboard for photovoltaic module.Backboard of the present invention has excellent weatherability, heat resistance, colour retention, tack between layer and sealant and resistance to marring.The degeneration of the solar module performance caused because moisture infiltrates can be down to minimum by this backboard.This backboard can also obtain the long-term photoelectric transformation efficiency of expectation.In addition, described backboard, or claim tergite, form attractive in appearance can be made with.
By adopting liquid coating application technology then to make backboard of the present invention by EVA compound, and can require to prune this backboard according to application.And, adopt the benefit of the solar module of described backsheet material to comprise the remarkable reduction of manufacturing cost.
In tergite, use liquid coating formulations to overcome one or more defects of the tergite of prior art.Tergite can be made thinner than current obtainable tergite.Backsheet material comprises the material more easily obtained, and described material can be processed at ambient temperature or at the temperature of appropriateness rising.Can directly by these liquid coating application on the second layer of lamination, thus do not need adhesive.In addition, can easily the additive of these liquid coatings with such as pigment, clay etc. be mixed.
In an aspect, describe the backboard for photovoltaic module, it has the layer comprising the crosslinkable amorphous fluoropolymer dissolving in organic solvent.This fluoropolymer can be the fluorinated copolymer of CTFE (CTFE) and one or more alkyl vinyl ethers comprising the alkyl vinyl ether with reactive OH function.This backboard can comprise the crosslinking agent mixed with this fluorinated copolymer.
This backboard also can comprise the extra play of such as polyester layer.Another act one example, this backboard also can comprise EVA layer.Other optional extra play can comprise following one: with polyester, Merlon, polyolefin, polyurethanes, liquid crystal polymer, aclar, aluminium, the sputtering aluminum oxide polyester of EVA coextrusion, sputter silica or silicon nitride polyester, sputtering aluminum oxide polycarbonate and sputter silica or silicon nitride Merlon.
Can by or by adhesive, the fluorinated copolymer layer of backboard is not coated to the layer of polyester layer or other type.And, this fluorinated copolymer layer can be applied to single or multiple lift.In one embodiment, the thickness of fluorinated copolymer layer is less than 1 Mill.In another aspect, the thickness of fluorinated copolymer layer is greater than 1 Mill.In another embodiment, backboard comprises silica.
Another aspect of the present invention describes the backboard for photovoltaic module.This backboard has the layer of the copolymer of the alkene comprising tetrafluoroethene (TFE) and have reactive OH function.This backboard also can comprise the crosslinking agent mixed with this fluorinated copolymer.In one embodiment, the thickness of fluorinated copolymer layer is less than 1 Mill.In another embodiment, the thickness of fluorinated copolymer layer is greater than 1 Mill.In another embodiment, backboard also has ionomer layer.
Fluorinated copolymer can be the terpolymer that maybe can comprise one or more fluorochemical monomers.In one embodiment, described terpolymer comprises vinylidene fluoride, tetrafluoroethene and hexafluoropropene.
And described backboard also can comprise the extra play of such as polyester layer.By adhesive or by adhesive, fluorinated copolymer layer is not coated to polyester layer.The combination of individual layer or transparent with coloured multilayer described fluorinated copolymer layer can be applied.Can corona discharge be carried out to polyester film extraly or carry out chemical treatment to improve adhesive force.Described backboard also can comprise EVA layer.In another embodiment, described backboard comprises silica.Other optional extra play can comprise following one: Merlon, with polyester, polyolefin, polyurethanes, liquid crystal polymer, aclar, aluminium, the sputtering aluminum oxide polyester of EVA coextrusion, sputter silica or silicon nitride polyester, sputtering aluminum oxide polycarbonate, sputter silica or silicon nitride Merlon, sputter aluminium oxide sputtering aluminium oxide sputtering silica or silicon nitride Lumiflon, sputtering silica or silicon nitride
In one aspect of the method, the method for the backboard of maintenance photovoltaic module is provided.Described method is included in the step in region when needing repairing, preparation being coated to described backboard, and described preparation comprises CTFE (CTFE) and the amorphous fluorinated copolymer of one or more alkyl vinyl ethers comprising the alkyl vinyl ether with reactive OH function.In one embodiment, under environment temperature or the appropriate temperature raised, described preparation is coated to described backboard.In another embodiment, described preparation is made up of the first component and second component, and described first and second components are arranged in the twin-chamber syringe being equipped with static mixer, and are applied by the coating unit being connected to described injector.
In one embodiment, the first component of described preparation is made up of the mixture of crosslinking agent and solvent, and second component is made up of the mixture of solvent and fluorinated copolymer.
Accompanying drawing explanation
In order to understand the present invention better, can with reference to accompanying drawing.
Fig. 1 shows the expanded view of the parts of typical photovoltaic module.
Fig. 2 shows an embodiment of typical backing sheet.
The chart of Fig. 3 demonstrates compared with the backboard based on Tedlar, based on the backboard of Lumiflon as the tensile strength of the function of " damp and hot " exposed amount.
The chart of Fig. 4 demonstrates compared with the backboard based on Tedlar, based on the backboard of Lumiflon as the elongation at break of the function of " damp and hot " exposed amount.
The chart of Fig. 5 demonstrates the backboard based on Lumiflon and compares with the UV stability of the backboard based on Tedlar.
Fig. 6 shows and the example of repairing the coating unit that external member uses jointly.
Detailed Description Of The Invention
The invention provides the protectiveness backboard for photovoltaic module.In one embodiment, by adopting liquid coating application technology to make backboard.In a preferred embodiment, after liquid coating application, EVA compound is used.Can according to coating need the combination process of EVA is adjusted.
In another embodiment, encapsulant is provided.This encapsulant has the excellent colour retention of excellent weatherability, heat resistance, UV stability, adhesive force to other parts of back veneer material and solar module, electrical separation and not yellowing.By spraying, described encapsulant is applied, thus the vacuum lamination process eliminated at elevated temperatures and reduce manufacturing cost.
In another aspect, employing " repairing external member " is provided to be torn or otherwise impaired tergite carries out the method for keeping in repair fast and easily.Described method and repair external member and allow to apply on the backboard of breakage when not adopting extreme temperature and pressure attractive in appearance and firmly coating.And such " repairing external member " allows to carry out at the scene fast and effective maintenance.The coating repairing external member coating is used to meet all requirements of EC60664-1, IEC61730, IEC1646 and ASTMF1249 according to method of the present invention.In preferred embodiment in this aspect of the invention, by using the twin-chamber syringe and coating unit coating " repairing " preparation that are equipped with static mixer.
Liquid coating formulations used in the present invention is applied at the temperature that can raise in environment temperature or appropriateness.The key component of liquid coating formulations is fluoropolymer, preferably dissolve in organic solvent or water dispersible, crosslinkable amorphous fluoropolymer.
The preferred ingredient of coating comprises the fluorinated copolymer with following structure:
And
The fluoropolymer that can use in liquid preparation includes but not limited to (Asahi Glass) and (Daikin).Other material comprises FluoroPel tMand FluoroThane tM(Cytonix Corporation), FluoroLink tMpolymer Modifiers (Solvay Solexis).Annexing ingredient in liquid coating formulations comprises the inorganic material of crosslinking agent, catalyst, solvent and optional filler and such as boron nitride (Zyp Coatings).
A kind of particularly preferred fluoropolymer is developed in nineteen eighty-two by Asahi Glass it is the amorphous fluorinated copolymer of CTFE (CTFE) and some specific alkyl vinyl ethers (VE).
The polymer that is combined as of alkyl vinyl ether monomer and oh group provides significant characteristic, as the compatibility of solubility, pigment, cross-linking reaction, adhesive force, hardness and flexibility to substrate.
Another preferred fluoropolymer is resin (Daikin), it is the copolymer of tetrafluoroethene (TFE) and the alkene dissolving in organic solvent.More specifically, be the tetrafluoroethene based on solvent and the copolymer of alkene with reactive OH function, and be prepared as the base resin in high performance paints and coating.
In another embodiment, fluoropolymer is terpolymer.Terpolymer can comprise one or more different fluorochemical monomers.Such as, terpolymer comprises vinylidene fluoride, tetrafluoroethene and hexafluoropropene.Dyneon tMtHV is a kind of such terpolymer, and provides the combination of performance advantage, as low processing temperature, is bonded to elastomer and based on the ability of the plastics of hydrocarbon, flexibility and optical transparence.As transparent rete, can by Dyneon tMtHV is used as front panel to replace glass.Add pigment and provide the rete that can be used as the backboard of photovoltaic module.
Can be used for including but not limited to such as following organic solvent with the organic solvent forming liquid coating formulations in the present invention: methyl ethyl ketone (MEK), acetone, methyl iso-butyl ketone (MIBK) (MIBK), toluene, dimethylbenzene, methyl alcohol, isopropyl alcohol, ethanol, heptane, ethyl acetate, isopropyl acetate, n-butyl acetate, n-butanol or their mixture.Preferred solvent comprises dimethylbenzene, cyclohexanone and methyl ethyl ketone (MEK).Following solvent is suitable: all components are all dissolved in wherein, and the low retention to being enough to make residual solvent in coating of boiling point is minimum or remove.
Can be used for including but not limited to titanium dioxide, carbon black, perylene pigment, pigment, dyestuff, mica, polyamide powder, boron nitride, zinc oxide, aluminium oxide, silica, UV absorbent, corrosion inhibitor and drier with the optional pigment and filler that form protective coating in the present invention.A kind of preferred pigment is titanium dioxide Ti- r-105 (DuPont).A kind of preferred hydrophobically modified silica is Cab-o-sil TS 720 (Cabot).The function of pigment, UV absorbent and corrosion inhibitor is to provide opacity and weatherability. ultrafine is preferred polyamide powder (Arkema Inc), and can be involved for reduction gloss.Carbon black, pigment and dyestuff can be comprised to change the color of backboard.Mica can be comprised to provide anti-flammability.Boron nitride, aluminium nitride and/or aluminium oxide can be comprised to improve heat conductivity.Preferably comprise nanoclays (Southern Clay Products), 3M tMglass Bubbles and drier are to improve moisture barrier characteristics.Silica and/or boron nitride can be comprised to improve dielectric property.Also can comprise silica to reduce gloss and to provide anti-flammability.
Formed in protective coating preferably adopt crosslinking agent with obtain be insoluble to organic solvent do not peel off rete.Preferred crosslinking agent includes but not limited to DuPont organic titanate, silane, isocyanates and melamine.Because these retes can use usually out of doors more than 30 years, therefore preferred aliphat isocyanates is to guarantee weatherability.
Such as, can by mixing solution, pigment, crosslinking agent and catalyst preparing based on the liquid preparation of coating composition.Utilize dibutyl tin laurate to accelerate the cross-linking reaction between Lumiflon (polyol) in organic solvent and isocyanates.By mixing preferably 3 to 80 parts and even more preferably about 46 parts by weight solution, 5 to 60 parts of (more preferably about 17 parts) pigment by weight and 20 to 80 parts (more preferably about 32 parts) organic solvent (mixtures of MEK and dimethylbenzene or cyclohexanone) by weight prepare this composition.
Backboard also can comprise extra play.By or by adhesive, extra play is not coated to fluorinated copolymer layer.Optional extra play can comprise such as following one: the coextrusion layer of the polymer of polyester, EVA, Merlon, polyolefin, polyurethanes, acrylic resin, polyimides, polyamide, liquid crystal polymer, aclar, aluminium, sputtering aluminum oxide polyester, sputtering silica or silicon nitride polyester, sputtering aluminum oxide polycarbonate, sputtering silica or silicon nitride Merlon, clear fluoropolymer and clear fluorocopolymers, such as polyester and EVA, and polybutadiene.
Embodiment 1
Example 1 illustrates of the present invention based on the preparation of protectiveness backboard.For in this embodiment for LF200 level, the xylene solution (200g) as 60% obtains from Asahi Glass.The Ti-obtained from DuPont for the pigment in this embodiment r-105 (76.2g).Crosslinking agent obtains from Bayer n3300 (21.4g).By use high-shear mixer by pigment with solution mixes, and then adds solvent and crosslinking agent.
Then preparation is applied.By applicator roll, liquid preparation is transferred to rete from disk container, and by Mayer Rod, the coating weight obtaining expectation is measured to liquid preparation.Coating is directly coated in (DuPont) on (5 Mill) polyester film.Without any need for adhesive, and do not use any adhesive in this embodiment yet.With 10-120g/m 2, preferred 30-90g/m 2and more preferably 30-45g/m 2coating weight coating coating.
Dry paint is by 60-65%'s by weight the pigment composition of by weight 35%.In this embodiment, by using polyester-urethane composite adhesive, will by based on preparation cover polyester film and EVA (vinylacetate containing 4%) compound.Then by obtained lamination and EVA sealant and assembly vacuum compound.
Table 1 show with backboard prepared by SP is compared, based on with the characteristic of protectiveness backboard.
Table 1
Table 2 show with by orientation the backboard of preparation is compared, based on the characteristic of protectiveness backboard.
Table 2
These results suggest that, thickness be 0.5 Mill based on with coating to demonstrate than thickness be the nondirectional of 1 Mill the barrier properties (lower moisture permeability and the proof voltage of Geng Gao) that SP is more excellent, and thickness is the nondirectional of 1 Mill the thickness of SP is with the twice of layer thickness.In addition, based on backboard than based on backboard more cost-effective.
Table 3 show with by orientation the backboard of preparation is compared, based on the weatherability of protectiveness backboard.Sample is placed in 85 DEG C and 85% relative humidity (" damp and hot ") condition under environmental chamber 2000 hours.Peel off test, the test of ASTM D 3359 cross cut tape adhesion and ASTM D882 and measure adhesive force between outer and polyester by bonding according to ASTM D 903-98, as the tensile strength of the function of " damp and hot " exposed amount and elongation at break, estimate outer field weatherability.Adopt following abbreviation in table 3: TB tears combination (tear bond); 5B=loses the coating of 0%; 4B=loses the coating lower than 5%; 3B=loses the coating of 5-15%; 2B=loses the coating of 15-35%; IB=loses the coating of 35%-65%; And 0B=loses the coating more than 65%.
Table 3
As shown in table 3, thin based on backboard weatherability with based on orientation backboard suitable.
Fig. 3 and 4 shows, as " damp and hot " exposed amount function based on the tensile strength of backboard and elongation at break than based on backboard much lower.
In order to assess UV stability, sample is placed in Atlas ci 4000 Xenon weather-ometer 4600 hours being equipped with xenon arc lamp, periodic measurement L *a *b *.B *-value represents " yellowing " of material.As shown in Figure 5, based on backboard UV stability with based on backboard suitable.
Embodiment 2
Example 2 illustrates of the present invention based on the preparation of Alternate embodiments of protectiveness backboard.For embodiment 2 for LF 200 grades, the xylene solution (150g) as 60% obtains from Asahi Glass.Pigment for this embodiment is the Ti-obtained from DuPont r-105 (57g).Hydrophobically modified silica for this embodiment is the Cab-o-sil TS-720 (10g) obtained from Cabot.Crosslinking agent used obtains from Bayer n3300 (16g).Catalyst for this embodiment is the dibutyl tin laurate MEK solution of 0.1% (0.15g) obtained from Aldrich.By using high-shear mixer by pigment and silica and solution mixes, and then adds solvent, crosslinking agent and catalyst.
Then preparation is applied.By applicator roll, liquid preparation is transferred to rete from disk container, and carries out by Mayer Rod the coating weight measuring to obtain expectation.Coating is directly coated in (DuPont) on (5 Mill) polyester film.Without any need for adhesive, and do not use any adhesive in this embodiment yet.With 10-120g/m 2, preferred 30-90g/m 2and more preferably 30-45g/m 2coating weight coating coating.
Table 4
As shown in table 4, comprise add silica embodiment 2 without silica based on backboard basis on produce the increase of 45V (maximum permissible voltage), and based on backboard basis on produce the increase of 40V.
Embodiment 3
Example 3 illustrates another embodiment of the present invention (based on " repairing assembly " preparation) preparation.
Repairing kit formulation based on Lumiflon is preferably prepared by the preparation of the component (A and B) comprising two kinds of isolation.
Component A is made up of the mixture of crosslinking agent (Isocyanate Desmodur N3300 (2.5g, Bayer)) and solvent (being dimethylbenzene in this embodiment).
B component is made up of the mixture of solvent, pigment and fluorinated copolymer.In this embodiment, B component is prepared as follows.By dispersant (Disperbyk 111 (0.25g, BYK-Chemie)) and 14.1g's lF 200 dimethylbenzene, Ti- r101 pigment (10g, DuPont), the mixture mixing of 2002D (4.7g, Arkema Inc) and coloring agent (Microlith Blue, Microlith Yellow, Microlith Brown and Orasol Black).Different coloring agents can be added to mate the color of the backboard be torn.
In use, component A and B is placed in the twin-chamber syringe being equipped with static mixer.On the broken parts of backboard, preparation is applied by using coating unit.Can obtain a kind of such coating unit from BrandywineAssociates, Fig. 6 shows this coating unit, and in the drawings, blender is labeled as 50, and coating unit threshold marker is 52, and the repairing kit formulation of coating is labeled as 54.But, the coating unit of any type of such as brush can be used to apply preparation.
Repair assembly and be applicable to a variety of backboard, such as those are by such as backboard prepared by the material of the prior art of/polyester/EVA or backboard prepared in accordance with the present invention.Shelf depreciation test has been carried out to the preparation be coated to based on the backboard of Tedlar.The result of this test is summarized in table 5.
The result of table 5. shelf depreciation test
In addition, by cross cut tape test ASTM D 3359-97, said preparation demonstrates the excellent adhesive attraction of the bottom to back veneer material, i.e. 5B.
Exist the apparent disclosed various amendment of the present invention of those skilled in the art, adjustment and application, and the application is intended to comprise these embodiments.Although by some preferred embodiment, invention has been described, and the gamut of these embodiments is determined by referring to the scope of appending claims.
Be incorporated to reference to mode entirety quote as proof herein various publications, patent and patent application disclosure.

Claims (9)

1., for the backboard lamination of photovoltaic module, it comprises:
Comprise skin that is that dissolve in organic solvent and/or water dispersible, crosslinkable amorphous fluoropolymer, described skin is coated on one or more layers Polymer interlayers, wherein said amorphous fluoropolymer be CTFE (CTFE) with the fluorinated copolymer of one or more alkyl vinyl ethers and with not containing the liquid coating application of adhesive in described intermediate layer; And on the face relative with skin in one or more layers intermediate layer described lamination comprise the EVA of coextrusion and the layer of polyester.
2. backboard lamination as claimed in claim 1, it comprises the crosslinking agent mixed with described fluorinated copolymer further.
3. backboard lamination as claimed in claim 2, described intermediate layer comprises further and comprises one or more layer following: polyester, Merlon, polyolefin, polyurethanes, liquid crystal polymer, polytrifluorochloroethylene and aluminium.
4. backboard lamination as claimed in claim 3, described polyester is selected from sputtering aluminum oxide polyester and sputtering silicon dioxide polyester.
5. backboard lamination as claimed in claim 3, described Merlon is selected from sputtering aluminum oxide polycarbonate and sputtering silicon dioxide polycarbonate.
6. the backboard lamination as described in claim arbitrary in claim 3-5, is wherein coated to described polyester layer when adhesive-free by the described layer comprising described fluorinated copolymer.
7. backboard lamination as claimed in claim 6, the thickness of wherein said fluorinated copolymer layer is less than 1 Mill.
8. backboard lamination as claimed in claim 6, the thickness of wherein said fluorinated copolymer layer is greater than 1 Mill.
9. the backboard lamination as described in claim arbitrary in claim 3-5, it comprises silica, titanium oxide, aluminium oxide, zinc oxide, beryllium oxide, mica, clay, boron nitride, aluminium nitride, titanium nitride, carbon black and/or organic pigment further.
CN200880002193.7A 2007-02-16 2008-02-01 Backing sheet for photovoltaic and method for repairing same Expired - Fee Related CN101605657B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US90198207P 2007-02-16 2007-02-16
US60/901,982 2007-02-16
US12/011,962 US20080264484A1 (en) 2007-02-16 2008-01-30 Backing sheet for photovoltaic modules and method for repairing same
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