CN115820146A - High-barrier photovoltaic back plate and preparation method and application thereof - Google Patents
High-barrier photovoltaic back plate and preparation method and application thereof Download PDFInfo
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- CN115820146A CN115820146A CN202111665419.5A CN202111665419A CN115820146A CN 115820146 A CN115820146 A CN 115820146A CN 202111665419 A CN202111665419 A CN 202111665419A CN 115820146 A CN115820146 A CN 115820146A
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- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 9
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 40
- 239000011787 zinc oxide Substances 0.000 claims description 20
- 230000004888 barrier function Effects 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 10
- 239000012745 toughening agent Substances 0.000 claims description 9
- 239000010445 mica Substances 0.000 claims description 8
- 229910052618 mica group Inorganic materials 0.000 claims description 8
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000012767 functional filler Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 230000000655 anti-hydrolysis Effects 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 229920005672 polyolefin resin Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 239000005083 Zinc sulfide Substances 0.000 claims description 2
- 239000002216 antistatic agent Substances 0.000 claims description 2
- 229910001593 boehmite Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
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- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 230000009545 invasion Effects 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 75
- 239000004372 Polyvinyl alcohol Substances 0.000 description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 229920013716 polyethylene resin Polymers 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000031700 light absorption Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
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- 238000001764 infiltration Methods 0.000 description 3
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- 229920000642 polymer Polymers 0.000 description 3
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229940014800 succinic anhydride Drugs 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 1
- 241001633106 Lithocarpus Species 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005373 Panax quinquefolius Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 150000001565 benzotriazoles Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Photovoltaic Devices (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the field of IPC classified B32B27/00, in particular to a high-barrier photovoltaic back plate and a preparation method and application thereof. The high-barrier photovoltaic back plate structurally comprises a bonding layer, a structural layer and a weather-resistant layer; the bonding layer is positioned at the bottom of the back plate; the weather-resistant layer is positioned on the top of the back plate; the structural layer is located between the bonding layer and the weather-resistant layer, and the structural layer is fixedly connected with the bonding layer and the weather-resistant layer through an adhesive. The photovoltaic back plate prepared by the application has good long-term water vapor and gas isolation, so that the phenomena of reduction of back plate cohesiveness, cracking and the like caused by invasion of water vapor and gas in a long-term use process are avoided while the photovoltaic back plate has good heat dissipation and heat resistance, and the photovoltaic back plate is suitable for popularization in the field of solar photovoltaic cells and has a wide development prospect.
Description
Technical Field
The invention relates to the field of IPC classified B32B27/00, in particular to a high-barrier photovoltaic back plate and a preparation method and application thereof.
Background
With the progress of society and economic development, the living standard of people is continuously improved, thereby putting higher requirements on living environment. In recent years, the use of fossil energy, which is liable to cause a large amount of pollution, has been regulated by more and more governments. The solar energy which can be used as a green renewable resource becomes one of the best schemes for solving the energy challenge of human beings, particularly the field of solar photovoltaic cells, and the development is rapid in recent years. However, the use of solar cells also presents some challenges, and one of the topics of photovoltaic research is how to enable solar cells to have excellent weather resistance and reliability during long-term outdoor use.
The solar cell backboard is used as a cell structure which can effectively protect a solar photovoltaic cell module and has good environmental adaptability, is widely applied in the field of solar cells, but the existing photovoltaic backboard product also has corresponding defects. For example, the prior art (CN 201010512663.3) provides a polymer back sheet for solar cell module, which mainly comprises a base film layer, an adhesive layer and a polymer film layer, and claims that the prepared back sheet has excellent mechanical properties, barrier properties and aging resistance. However, the fillers such as titanium dioxide and silicon dioxide added in the patent for improving the toughness and the heat resistance of the back sheet are easily subjected to moisture permeation and adsorption during long-term use of the back sheet due to the hydrophilic effect and the micro-crack phenomenon after the addition, thereby affecting the adhesion of the polymer layer, reducing the thermal conductivity and the adhesion, and reducing the service life of the back sheet.
Therefore, there is a need for a photovoltaic backsheet product having excellent long-term barrier properties while having excellent thermal conductivity, thermal resistance, mechanical properties, and adhesion.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a high-barrier photovoltaic backsheet, which includes a bonding layer, a structural layer, and a weatherable layer; the bonding layer is positioned at the bottom of the back plate; the weather-resistant layer is positioned on the top of the back plate; the structural layer is located between the bonding layer and the weather-resistant layer, and the structural layer is fixedly connected with the bonding layer and the weather-resistant layer through an adhesive.
Preferably, the thickness of the bonding layer is 10 to 50 micrometers; the thickness of the structural layer is 150-300 microns; the thickness of the weather-resistant layer is 50-100 micrometers.
Preferably, the thickness of the bonding layer is 20 to 30 micrometers; the thickness of the structural layer is 200-240 microns; the thickness of the weather-resistant layer is 60-80 microns.
As a preferable scheme, the weather-resistant layer is a polyvinylidene fluoride film layer or a polyvinyl fluoride film layer.
Preferably, the weather-resistant layer is a polyvinyl fluoride film layer.
As a preferable scheme, the polyvinylidene fluoride film layer or the polyvinyl fluoride film layer is further subjected to aluminum plating treatment on the upper and lower surfaces.
As a preferable scheme, the aluminized thickness of the surface of the polyvinyl fluoride membrane layer is 10-50 nanometers.
As a preferable scheme, the raw materials of the structural layer at least comprise the following components in parts by mass: 50-100 parts of polyester resin, 1-10 parts of antioxidant, 20-40 parts of functional filler, 20-30 parts of toughening agent and 5-20 parts of auxiliary agent.
In a preferred embodiment, the polyester resin is PET.
Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1098, antioxidant 3114 and antioxidant 264.
Preferably, the toughening agent is at least one of a rubber toughening agent, a thermoplastic resin toughening agent and a terpolymer toughening agent.
As a preferable scheme, the functional filler is at least one of titanium dioxide, white carbon black, zinc oxide, mica powder, boehmite, talcum powder, zinc sulfide, calcium carbonate, glass fiber, molybdenum sulfide and metal oxide.
As a preferred solution, the functional filler is a mixture of zinc oxide and mica powder.
Preferably, the mass ratio of the zinc oxide to the mica powder is 2-3:1.
In a preferred embodiment, the zinc oxide is a coating-modified zinc oxide.
As a preferred scheme, the preparation method of the coating modified zinc oxide comprises the following steps: (1) Adding zinc oxide into DMF solution of succinic anhydride and silane coupling agent, heating to 60-80 ℃, and pretreating for 2-4 hours; (2) Adding the pretreated zinc oxide, zinc nitrate and terephthalic acid into a DMF solution at the same time, and carrying out ultrasonic reaction at 60-100 ℃ and 200-400W for 2-4 hours; (3) Filtering after the reaction is finished, washing with DMF, soaking in chloroform, and drying to obtain the product.
In a preferred embodiment, the average particle size of the coated modified zinc oxide is 100 to 500nm.
In a preferred embodiment, the average particle size of the coated modified zinc oxide is 200 to 300nm.
In this application, through the cladding to zinc oxide modified, not only further improvement zinc oxide's heat conduction efficiency, still provided the motion set point of electron for electron and electron hole enrichment in combined material reduces the inside electron flow of panel, and provides the hydrophobic surface of cladding, thereby realized hydrophobic modification, light fastness and prevent the triple enhancement of static. The problem that due to the addition of zinc oxide, the existence of polyhydroxy groups and other groups on the surface of the zinc oxide has a very obvious moisture absorption effect is avoided, so that the moisture permeation prevention effect of the backboard is reduced, and the negative performance influence of the backboard is generated while the backboard has good heat conduction performance; meanwhile, the light absorption performance of the modified particles is improved, so that the light absorption performance can be effectively improved, and the modified particles have a good light resistance effect on the premise of not adding an additional ultraviolet absorbent.
Preferably, the mica powder is lamellar sericite powder.
Preferably, the lamellar sericite powder has an average fineness of 8000 to 14000 meshes.
Preferably, the lamellar sericite powder has an average fineness of 12000 meshes.
In this application, through adopting behind the sericite powder under the specific fineness of 12000 meshes adds the sheet layer, can maximum effective dispersion and arrange layer upon layer with intensive and careful lamellar in the slab that forms, this kind of intensive and careful arrangement can increase the infiltration distance and the infiltration degree of difficulty of big medium by a wide margin, effectively restrained gas such as aqueous vapor and volatile chemical substance and equi-oxygen to the infiltration effect of sheet layer for the backplate has played fine anti moisture permeability and has kept apart the effect of corroding the medium. And the sericite powder with the fineness can be effectively filled in tiny micro-pores of the rubber, and the sericite powder can enter micro-crack gaps formed by the internal stress and the external stress of the rubber under the action of the internal stress and the external stress, and a silk-like connection structure is formed by the active surface and the active atom center and the action force of a polymer chain of the rubber material, so that the generated cracks are converted into a silver pattern state. Since the crack is terminated and converted into a craze state to delay the fracture of the back sheet, the back sheet may be fractured by consuming more external energy or stress, thereby improving the impact toughness and tensile strength of the back sheet.
As a preferable scheme, the raw materials of the bonding layer at least comprise the following components in parts by mass: 50-100 parts of polyolefin resin, 1-10 parts of antioxidant and 1-20 parts of auxiliary agent.
In a preferred embodiment, the polyolefin resin is a polyethylene resin.
As a preferable scheme, 20-40 parts of polyvinyl alcohol is also added into the bonding layer; the average molecular weight of the polyvinyl alcohol is 15-20 ten thousand.
In a preferred embodiment, the mass ratio of the polyethylene resin to the polyvinyl alcohol is 14 to 16:5 to 7.
As a preferable scheme, the mass ratio of the polyethylene resin to the polyvinyl alcohol is 16:6.
in the application, by adopting the compound polyethylene resin and the polyvinyl alcohol with specific molecular weight, the oxygen barrier property of the back plate is effectively improved, and meanwhile, the waterproof property and the mechanical property of the back plate bonding layer are kept, so that the overall performance of the back plate is ensured. The applicant believes that: the weight ratio of the polyethylene resin to the polyvinyl alcohol is defined as 16: and 6, the dipole-dipole interaction in the nonpolar polyethylene resin can be effectively promoted, and the chain mobility of the molecular chain in the whole resin system is reduced, so that a good permeate diffusion limiting effect can be formed in the resin of the PO system. And the polyvinyl alcohol with a specific molecular weight is selected, so that the chain winding phenomenon of a long chain section in a PO system can be controlled, and the problem of the reduction of the overall mechanical property caused by the increase of local internal stress is avoided. When the addition amount of the polyvinyl alcohol is relatively low or relatively high, it is difficult to balance the problems of oxygen affinity and hydrophilicity caused by the addition of the polyvinyl alcohol.
Preferably, the auxiliary agent is at least one of an anti-hydrolysis agent, an ultraviolet absorber, a flame retardant, a waterproof agent and an antistatic agent.
In a preferred embodiment, the hydrolysis resistant agent is SW-100.
In a preferred embodiment, the ultraviolet absorber is at least one of salicylates, benzophenones and benzotriazoles.
Preferably, the flame retardant is at least one of magnesium oxide, aluminum hydroxide and phosphorus flame retardants.
The second aspect of the invention provides a preparation method of the high-barrier photovoltaic back plate, which comprises the steps of coating an adhesive on the surfaces of the fixed bonding surfaces of the bonding layer, the weather-resistant layer and the structural layer, and compounding and rolling the three layers.
The third aspect of the invention provides an application of the high-barrier photovoltaic back sheet, including an application of the high-barrier photovoltaic back sheet in a solar photovoltaic cell module.
Has the advantages that:
1. according to the photovoltaic backboard prepared in the application, the coating modification of the added zinc oxide particles in the structural layer effectively improves the heat conduction and heat resistance efficiency of the backboard, and meanwhile, the reduced moisture-proof and moisture-permeable performance caused by the addition of the zinc oxide particles can be effectively avoided, so that the backboard has excellent moisture barrier property and cohesiveness in the long-time use process; meanwhile, the light absorption performance of the modified particles is improved, so that the light absorption performance can be effectively improved, and the modified particles have a good light resistance effect on the premise of not adding an additional ultraviolet absorbent.
2. The photovoltaic backboard prepared in the application is added into the board layer by adopting sericite powder under 12000-mesh specific fineness, can be effectively dispersed to the maximum degree and is arranged layer by layer in the formed board sheet in an intensive and delicate lamellar manner, the intensive and delicate arrangement mode can greatly increase the penetration distance and the penetration difficulty of large media, effectively inhibits the penetration of gases such as steam, volatile chemical substances, equal oxygen and the like to the board layer, and ensures that the backboard plays a good role in resisting moisture permeation and isolating corrosion media.
3. According to the photovoltaic back plate prepared in the application, through adopting the compound polyethylene resin and the polyvinyl alcohol with the specific molecular weight, the oxygen barrier property of the back plate is effectively improved, and meanwhile, the waterproof property and the mechanical property of the back plate bonding layer are kept, so that the overall performance of the back plate is ensured.
Detailed Description
Example 1
Embodiment 1 provides in a first aspect a high barrier photovoltaic backsheet, the structure comprising a tie layer, a structural layer, and a weatherable layer; the bonding layer is positioned at the bottom of the back plate; the weather-resistant layer is positioned on the top of the back plate; the structural layer is located between the bonding layer and the weather-resistant layer, and the structural layer is fixedly connected with the bonding layer and the weather-resistant layer through an adhesive.
Wherein the bonding layer has a thickness of 25 microns; the thickness of the structural layer is 220 microns; the thickness of the weathering layer was 70 microns; the lower surface of the weather-resistant layer is also subjected to aluminizing treatment and covered with an aluminum layer film, and the thickness of the aluminum layer film is 20nm.
Wherein the weather-resistant layer is a polyvinyl fluoride film layer; the polyvinyl fluoride film layer was purchased from a model Tedlar-pvf, sold by dupont, usa.
The raw materials of the structural layer comprise the following components in parts by mass: 80 parts of PET resin, 4 parts of antioxidant, 25 parts of functional filler, 25 parts of toughening agent and 10 parts of auxiliary agent.
Wherein the PET resin is purchased from a PET resin product sold by DuPont, U.S.A. under the model NC 011; the antioxidant is antioxidant 1010; the toughening agent is a Japanese Brillouin MBS-M210 type toughening agent.
The functional filler is a mixture of zinc oxide and mica powder, and the mass ratio is 2.5.
The zinc oxide is coated modified zinc oxide, and the preparation method comprises the following steps (in parts by weight): (1) Adding 1.5 parts of zinc oxide into 100 parts of DMF solution of 10 parts of succinic anhydride and 10 parts of (3-aminopropyl) triethoxysilane, heating to 70 ℃, and pretreating for 2.5 hours; (2) Adding pretreated zinc oxide 1.5 parts, zinc nitrate 10 parts and terephthalic acid 15 parts into DMF 160 parts at the same time, and carrying out ultrasonic reaction at 70 ℃ and 250W for 3 hours; (3) Filtering after the reaction is finished, washing with DMF, soaking in chloroform, and drying to obtain the product.
The average grain diameter of the coated modified zinc oxide is 280nm; the mica powder is lamellar sericite powder with the average fineness of 12000 meshes.
The structural layer auxiliary agent is an anti-hydrolysis agent SW-100.
The bonding layer comprises the following raw materials in parts by mass: 80 parts of polyethylene resin, 30 parts of polyvinyl alcohol, 5 parts of antioxidant and 5 parts of auxiliary agent.
The antioxidant is antioxidant 1010; the auxiliary agent is an anti-hydrolysis agent SW-100; the polyvinyl alcohol has an average molecular weight of 15 ten thousand and is purchased from a medium-viscosity grade polyvinyl alcohol product sold by Lithocarpus Shandong chemical Co.
The second aspect of the invention provides a preparation method of the photovoltaic back plate with high barrier property, which comprises the steps of coating an adhesive with the thickness of 10 microns on the surfaces of fixed bonding surfaces of the bonding layer, the weather-resistant layer and the structural layer, and compounding and rolling the three layers.
The adhesive is an EPI aldehyde-free adhesive product sold by Sheng environmental protection engineering Limited company in Dongying city.
Example 2
The embodiment of the present invention is different from embodiment 1 in that: the mass ratio of the zinc oxide to the mica powder is 2:1.
Comparative example 1
The embodiment of this comparative example is the same as example 1 except that: the conventional zinc oxide particles are adopted to replace the coated modified zinc oxide, and the average particle size of the zinc oxide is 50nm.
Comparative example 2
The embodiment of this comparative example is the same as example 1 except that: the average fineness of the lamellar sericite powder is 20000 meshes.
Comparative example 3
The embodiment of this comparative example is the same as example 1 except that: 10 parts of polyvinyl alcohol.
Evaluation of Performance
1. Water vapor transmission rate: the structural layer materials prepared in the examples and comparative examples were subjected to a sample preparation test with reference to test standard GB/T21529, 10 samples were tested for each example comparative example, and the average of the measured values is shown in Table 1.
2. Weather resistance: the structural layer materials prepared in the examples and the comparative examples are subjected to sample preparation test, the specification of the sample is 2cm multiplied by 2cm, the sample is placed in a water-ultraviolet irradiation test box to be observed, the test condition is that the temperature is 40 ℃, the power of a mercury lamp is 300W, whether the sample preparation surface is yellow or not is checked after 30 days, the cracking phenomenon is marked as unqualified, 100 samples are tested in each example comparative example, less than or equal to 10 samples are A, less than or equal to 20 samples are unqualified to be B, more than 20 samples are unqualified to be C, and the measured results are recorded in a table 1.
TABLE 1
According to the embodiments 1-2, the comparative examples 1-3 and the table 1, the photovoltaic back plate with high barrier property and the preparation method and the application thereof provided by the invention have good long-term water-gas and gas barrier property, so that the photovoltaic back plate has good heat dissipation and heat resistance, avoids phenomena of back plate adhesion reduction, cracking and the like caused by invasion of water gas and gas in a long-term use process, is suitable for popularization in the field of solar photovoltaic cells, and has a wide development prospect. In example 1, the optimal performance index is obtained under the conditions of optimal plate structure, optimal preparation raw material ratio, optimal preparation process and the like.
Claims (10)
1. A high barrier photovoltaic backsheet, comprising: the structure comprises a bonding layer, a structural layer and a weather-resistant layer; the bonding layer is positioned at the bottom of the back plate; the weather-resistant layer is positioned on the top of the back plate; the structural layer is located between the bonding layer and the weather-resistant layer, and the structural layer is fixedly connected with the bonding layer and the weather-resistant layer through an adhesive.
2. The high barrier photovoltaic backsheet according to claim 1, wherein: the thickness of the bonding layer is 10-50 micrometers; the thickness of the structural layer is 150-300 microns; the thickness of the weather-resistant layer is 50-100 micrometers.
3. The high barrier photovoltaic backsheet according to any one of claims 1 to 2, wherein: the weather-resistant layer is a polyvinylidene fluoride film layer or a polyvinyl fluoride film layer.
4. The high barrier photovoltaic backsheet according to claim 3, wherein: the polyvinylidene fluoride film layer or the polyvinyl fluoride film layer is also subjected to aluminum plating treatment on the upper surface and the lower surface.
5. The high barrier photovoltaic backsheet according to any one of claims 1 to 4, wherein: the raw materials of the structural layer at least comprise the following components in parts by mass: 50-100 parts of polyester resin, 1-10 parts of antioxidant, 20-40 parts of functional filler, 20-30 parts of toughening agent and 5-20 parts of auxiliary agent.
6. The high barrier photovoltaic backsheet according to claim 5, wherein: the functional filler is at least one of titanium dioxide, white carbon black, zinc oxide, mica powder, boehmite, talcum powder, zinc sulfide, calcium carbonate, glass fiber, molybdenum sulfide and metal oxide.
7. The high barrier photovoltaic backsheet according to any one of claims 1 to 6, wherein: the bonding layer at least comprises the following raw materials in parts by mass: 50-100 parts of polyolefin resin, 1-10 parts of antioxidant and 1-20 parts of auxiliary agent.
8. The high barrier photovoltaic backsheet according to claim 5 or 7, characterized in that: the auxiliary agent is at least one of an anti-hydrolysis agent, an ultraviolet-resistant absorbent, a flame retardant, a waterproof agent and an antistatic agent.
9. A method for preparing a high-barrier photovoltaic backsheet according to any one of claims 1 to 8, characterized in that: and coating adhesives on the surfaces of the fixed bonding surfaces of the bonding layer, the weather-resistant layer and the structural layer, and compounding and rolling the three layers to obtain the weather-resistant paint.
10. Use of a high barrier photovoltaic backsheet according to any one of claims 1 to 8, characterized in that: the high-barrier photovoltaic back plate is applied to a solar photovoltaic cell module.
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