CN111435688A - Photovoltaic backboard and photovoltaic module comprising same - Google Patents

Photovoltaic backboard and photovoltaic module comprising same Download PDF

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Publication number
CN111435688A
CN111435688A CN201811595404.4A CN201811595404A CN111435688A CN 111435688 A CN111435688 A CN 111435688A CN 201811595404 A CN201811595404 A CN 201811595404A CN 111435688 A CN111435688 A CN 111435688A
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layer
material layer
pvdf
silane coupling
coupling agent
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CN111435688B (en
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杨灵慧
付传国
夏正月
刘亚锋
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Suqian Atlas Sunshine Energy Technology Co ltd
Canadian Solar Inc
CSI Cells Co Ltd
Canadian Solar Manufacturing Changshu Inc
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CSI Cells Co Ltd
CSI Solar Power Group Co Ltd
Canadian Solar Manufacturing Changshu Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor 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
    • H01L31/04—Semiconductor 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
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/08—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor 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
    • H01L31/04—Semiconductor 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
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/24—Organic non-macromolecular coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/12—Photovoltaic modules
    • 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

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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)
  • Photovoltaic Devices (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a photovoltaic back plate, which comprises a PET layer, a first material layer and a second material layer, wherein the first material layer and the second material layer are respectively arranged on two sides of the PET layer; the first material layer is a PVDF layer with a silanol bond grafted on the surface; the first material layer is used for bonding with an EVA (ethylene vinyl acetate) layer of a solar cell module. The back plate provided by the invention can be directly modified on the surface of an unmodified PVDF/PET/PVDF plate, the surface of the PVDF layer is firstly grafted with a silanol bond through hydroxyl to form siloxane, so that a silane coupling agent is obtained on the surface of the PVDF layer, and amine functional groups in the silane coupling agent can react with organic groups in EVA, so that the adhesion with the EVA is improved, the operation is simple, the cost is low, and the adhesion effect is good.

Description

Photovoltaic backboard and photovoltaic module comprising same
Technical Field
The invention belongs to the technical field of photovoltaic modules, and particularly relates to a photovoltaic back plate and a photovoltaic module comprising the same.
Background
The current back plate for packaging the solar cell module is commonly used with a TPT polyvinyl fluoride composite membrane, the TPT is commonly used with a three-layer structure (PVF/PET/PVF), an outer protective layer PVF has good environmental erosion resistance, a middle layer is a PET polyester film and has good insulating property, and an inner layer PVF needs to be subjected to surface treatment and EVA has good bonding property. PVDF resin is used as a resin product with a structure similar to that of PVF, and has better characteristic requirements for a back plate because the fluorine content of 59 percent of PVDF is far more than 41 percent of that of PVF. The fluorine coating prepared by the PVDF resin has unparalleled weather resistance, so that the fluorine coating has better weather resistance than PVF as a film material, and further, the performances of the fluorine coating, such as the yellowing index, the mechanical strength after aging and the like, are better than those of the PVF material. PVDF does not readily adhere to EVA layers, limiting its application in photovoltaic modules.
CN105895722A discloses a PVDF film for a single-sided frosted high-reflection solar backboard and a preparation method thereof, the PVDF film comprises an outer layer, a middle layer, an inner layer and a reflection layer which are formed by four layers of melt coextrusion and are sequentially compounded from one side to the other side, the outer layer and the inner layer are made of polyvinylidene fluoride, the surface of the outer layer, which is far away from the middle layer, is a frosted surface, and the reflection layer is made of acrylic acid grafted polyvinylidene fluoride copolymer. By introducing the acrylic acid graft modified PVDF film layer, the problem of EVA adhesion is solved, the light reflection rate of the surface of the backlight film close to the EVA is improved, and the light utilization rate is improved. The acrylic acid grafted polyvinylidene fluoride copolymer is grafted with acrylic acid on polyvinylidene fluoride molecules by a free radical polymerization method.
CN107199752A discloses a polyvinylidene fluoride composite membrane and a preparation method thereof, wherein the polyvinylidene fluoride composite membrane comprises: the laminated film comprises an outer PVDF layer, a middle layer and an inner polyolefin layer, wherein the middle layer is an acrylic copolymer layer or an olefin copolymer layer, and the olefin copolymer layer is one or more of graft modified ethylene-vinyl acetate EVA and graft modified polyolefin elastomer POE. The outer PVDF layer comprises the following raw materials in parts by mass: 80-100 parts of PVDF, 0-20 parts of PMMA, acrylic elastomer or acrylate copolymer, 0-2 parts of antioxidant and 0-2 parts of ultraviolet absorber. The solar cell back plate prepared by the invention adopts the modified PVDF composite film, has good adhesive property and good aging resistance effect, greatly reduces the production cost of the fluorine film, has simple and practical preparation method process, and reduces the difficulty of compounding the fluorine film with other base materials.
The modification of the PVDF material is carried out in situ modification by adding a modification component into the PVDF component, so that the cohesiveness of the PVDF is improved, the operation is complex, and the formed PVDF/PET/PVDF laminated structure cannot be modified.
There is a need in the art to develop a photovoltaic back sheet, which can be directly surface-modified to obtain a back sheet using already formed PVDF/PET/PVDF sheets.
Disclosure of Invention
One of the purposes of the invention is to provide a photovoltaic back plate, which comprises a PET layer, a first material layer and a second material layer, wherein the first material layer and the second material layer are respectively arranged on two sides of the PET layer;
the first material layer is a PVDF layer with the surface containing a silane coupling agent;
the first material layer is used for bonding with an EVA (ethylene vinyl acetate) layer of a solar cell module.
According to the photovoltaic back plate provided by the invention, the silane coupling agent is only obtained on the surface of the PVDF layer, the PVDF material is not required to be modified in situ, namely the PVDF/PET/PVDF plate obtained by any method (such as commercial production) is directly modified, the silane coupling agent is obtained on the surface of the PVDF plate, the adhesion with the EVA layer of the photovoltaic module is realized through the amine functional group, and the adhesion with the EVA layer is improved.
Preferably, the second material layer is a PVDF layer, preferably a PVDF layer with hydroxyl groups grafted on the surface through silanol bonds.
Preferably, the surface of the PVDF layer is grafted with hydroxyl groups through silanol bonds, and the grafting rate of the hydroxyl groups is 100%.
As one of the preferable technical solutions, when the first material layer is a PVDF layer with a silanol bond grafted on the surface, the photovoltaic back sheet is prepared by the following method:
(1) providing a substrate, wherein the substrate comprises a PET layer, and a first raw material layer and a second raw material layer which are respectively arranged on two sides of the PET layer; the first raw material layer is an unmodified PVDF layer; subjecting a first raw material layer of the substrate to plasma bombardment;
(2) and coating a silane coupling agent solution on the surface of one side of the first raw material layer of the substrate bombarded by the plasma, and drying to obtain the back plate.
As a second preferred technical solution, when the first material layer and the second material layer of the present invention are both PVDF layers with silane coupling agents on the surfaces, the photovoltaic back sheet of the present invention is prepared by the following method:
(1) providing a substrate, wherein the substrate comprises a PET layer, and a first raw material layer and a second raw material layer which are respectively arranged on two sides of the PET layer; the first raw material layer and the second raw material layer are both unmodified PVDF layers; carrying out plasma bombardment on the first raw material layer and the second raw material layer of the substrate;
(2) and coating silane coupling agent solution on the surface of one side of the first raw material layer and the surface of one side of the second raw material layer of the substrate after the plasma bombardment, and drying to obtain the back plate.
According to the invention, before modification of a silane coupling agent, plasma bombardment is firstly carried out to generate active groups (such as hydroxyl) on the surface of the PVDF layer, and then the PVDF layer is contacted with the silane coupling agent, the silane coupling agent can be combined with the hydroxyl on the surface of the PVDF layer to realize surface grafting of a silanol bond to form siloxane, so that the PVDF layer of the silane coupling agent is obtained on the surface, and the back plate provided by the invention is obtained.
Preferably, the plasma bombardment comprises oxygen plasma bombardment.
Oxygen plasma bombardment can cause hydroxyl groups to form on the surface of the PVDF layer.
Preferably, the bombardment condition of the oxygen plasma is that the bombardment current is 50-60 mA (such as 52mA, 55mA, 58mA, etc.), and the bombardment time is 20-25 min (such as 22min, 23min, 24min, etc.).
Preferably, the subjecting of the substrate to plasma bombardment specifically comprises:
and (3) placing the substrate in a vacuum chamber, pressurizing and discharging the electrode, simultaneously charging oxygen, ionizing the oxygen, and bombarding the PVDF surface by positively charged ions under the action of an electric field to obtain the substrate with hydroxyl on the surface.
Preferably, the amount of oxygen charged is 6.0 × 10 at a pressure to the vacuum chamber-2Pa。
Preferably, the silane coupling agent solution contains 2.5 to 3.5 v% of the silane coupling agent, for example, 2.6 v%, 2.8 v%, 2.9 v%, 3.2 v%, 3.4 v%, etc.
Preferably, the silane coupling agent is 3-aminopropyltriethoxysilane.
3-aminopropyltriethoxysilane is selected as a silane coupling agent, hydroxyl groups can be grafted on the PVDF layer through silanol bonds to form siloxane, the PVDF layer with the silane coupling agent on the surface is obtained, and amine functional groups in the silane coupling agent can react with organic groups in EVA, so that firm adhesion with the EVA is realized.
Preferably, the solvent of the silane coupling agent solution is ethanol and/or water, preferably in a volume ratio of 2.8-3.2: 1, such as 2.9:1, 3:1, 3.1:1, preferably 3: 1.
Preferably, the pH value of the silane coupling agent solution is 3.8-4.2, such as 3.9, 4.0, 4.1, preferably 4.0.
Preferably, the preparation process of the silane coupling agent solution is as follows: and mixing the silane coupling agent, water and ethanol, adjusting the pH value, and stirring to obtain the silane coupling agent.
Preferably, the stirring temperature is 43-47 ℃ (for example, 44 ℃, 45 ℃, 46 ℃ and the like), and the time is 22-26 h (for example, 23h, 24h, 25h and the like).
Preferably, the coating mode comprises any 1 of spraying, soaking and brushing, and spraying is preferred.
Preferably, the coating amount is 0.8-1.2 g/cm2Preferably 0.9g/cm2、1.0g/cm2、1.1g/cm2And the like.
Taking oxygen plasma bombardment and silane coupling agent treatment as an example, the principle of modifying the PVDF surface by the silane coupling agent provided by the invention can be presumed as follows:
after oxygen plasma bombards PVDF, hydroxyl (marked as HO-PVDF) is formed on the surface of PVDF; and (3) reacting the silicon hydroxyl compound obtained after the silane coupling agent is hydrolyzed with HO-PVDF for dehydration, and grafting the residual groups of the silane coupling agent to the PVDF in the form of silicon hydroxyl bonds (namely forming siloxane bonds).
The specific reaction formula is as follows:
(1) silane coupling agent hydrolysis
R1-Si-(OR2)(OR3)(OR4)3+H2O→R1-Si-(OR2)(OR3)(OH)+R4OH
R1-Si-(OR2)(OR3)(OH)+H2O→R1-Si-(OR2)(OH)2+R3OH
R1-Si-(OR2)(OH)2+H2O→R1-Si-(OH)3+R2OH
Wherein R is1、R2、R3、R4Each independently selected from substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C1-20 aminoalkyl, substituted or unsubstituted C6-30 aromatic group, substituted or unsubstituted C3-30 heteroaromatic group and the likeAny 1 or a combination of at least 2.
Exemplary R of 3-aminopropyltriethoxy silicon1Is 3-aminopropyl, R2、R3、R4Are all ethyl groups.
Illustratively, the mechanism of the bonding of the silane coupling agent to the PVDF layer after plasma bombardment is presumed to be:
PVDF-OH+R1-Si-(OH)3→PVDF-O-Si-R1(OH)+H2O。
the invention also provides a photovoltaic module which sequentially comprises toughened glass, a first EVA layer, a solar cell, a second EVA layer and the photovoltaic back plate in one of the purposes along the light incidence direction.
Compared with the prior art, the invention has the following beneficial effects:
(1) the photovoltaic back plate provided by the invention can be directly modified on the surface of an unmodified PVDF/PET/PVDF plate, hydroxyl groups are grafted on the surface of the PVDF layer through silanol bonds to form siloxane, so that the PVDF layer with the silane coupling agent on the surface is obtained, and amine functional groups in the silane coupling agent can react with organic groups in EVA, so that the adhesion with the EVA is improved, the operation is simple, the cost is low, and the adhesion effect is good.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
A photovoltaic backsheet prepared by the process of:
(1) selecting a laminated board with an unmodified PVDF/PET/PVDF three-layer structure, and carrying out oxygen plasma bombardment on one side of the laminated board under the condition that the pressure of oxygen gas charged into a vacuum chamber is 6.0 × 10-2Pa, pressurizing and discharging an electrode, wherein the bombardment current is 55mA, and the bombardment time is 22 min;
(2) spraying 3-aminopropyl triethoxysilane solution with the volume concentration of 3 v% on the bombarded surface of the laminated board bombarded by the oxygen plasma in the step (1) by the spraying amountIs 1g/cm2. The preparation process of the 3-aminopropyltriethoxysilane solution comprises the steps of mixing a silane coupling agent, water and ethanol, adjusting the pH value to 4.0, and stirring at the temperature of 43-47 ℃ for 22-26 h to obtain the silane coupling agent.
Example 2
A photovoltaic backsheet prepared by the process of:
(1) selecting a laminated board with an unmodified PVDF/PET/PVDF three-layer structure, and carrying out oxygen plasma bombardment on one side of the laminated board under the condition that the pressure of oxygen gas charged into a vacuum chamber is 6.0 × 10-2Pa, pressurizing and discharging the electrode, wherein the bombardment current is 60mA, and the bombardment time is 20 min;
(2) spraying 3-aminopropyl triethoxysilane solution with the volume concentration of 2.5 v% on the bombarded surface of the laminated board bombarded by the oxygen plasma in the step (1), wherein the spraying amount is 1.2g/cm2. The preparation process of the 3-aminopropyltriethoxysilane solution comprises the steps of mixing a silane coupling agent, water and ethanol, adjusting the pH value to 4.0, and stirring at the temperature of 43-47 ℃ for 22-26 h to obtain the silane coupling agent.
Example 3
A photovoltaic backsheet prepared by the process of:
(1) selecting a laminated board with an unmodified PVDF/PET/PVDF three-layer structure, and carrying out oxygen plasma bombardment on one side of the laminated board under the condition that the pressure of oxygen gas charged into a vacuum chamber is 6.0 × 10-2Pa, pressurizing and discharging the electrode, wherein the bombardment current is 50mA, and the bombardment time is 25 min;
(2) spraying 3-aminopropyl triethoxysilane solution with the volume concentration of 3.5 v% on the bombarded surface of the laminated board bombarded by the oxygen plasma in the step (1), wherein the spraying amount is 0.8g/cm2. The preparation process of the 3-aminopropyltriethoxysilane solution comprises the steps of mixing a silane coupling agent, water and ethanol, adjusting the pH value to 4.0, and stirring at the temperature of 43-47 ℃ for 22-26 h to obtain the silane coupling agent.
Example 4
The difference from example 1 is that:
oxygen plasma bombardment with the conditions: charging oxygen to trueThe pressure of the empty chamber was 6.0 × 10-2Pa, pressurizing and discharging the electrode, wherein the bombardment current is 45mA, and the bombardment time is 30 min.
Example 5
The difference from example 1 is that:
the 3-aminopropyltriethoxysilane solution had a volume concentration of 4.0 v% and a spraying amount of 1.3g/cm2。
Comparative example 1
A photovoltaic backsheet prepared by the process of:
(1) selecting a laminated board with an unmodified PVDF/PET/PVDF three-layer structure, spraying a 3-aminopropyl triethoxysilane solution with the volume concentration of 3.0 v% on one side of PVDF of the laminated board, wherein the spraying amount is 1g/cm2。
Comparative example 2
A photovoltaic backsheet prepared by the process of:
(1) selecting a laminated board with an unmodified PVDF/PET/PVDF three-layer structure, and carrying out oxygen plasma bombardment on one side of the laminated board under the conditions that the bombardment current is 40mA and the bombardment time is 10 min.
And (3) performance testing:
the backsheets provided in the examples and comparative examples were subjected to the following performance tests:
weather resistance: the test method is ASTMG154, and the ultraviolet radiation is 30WKWh/m2No obvious change is marked as qualified; the defect of cracking and the like is marked as unqualified;
adhesion to EVA: the testing method is a peeling strength test, a knife is used for scratching a strip with the width of 1cm from the back plate and the EVA, the strip is guaranteed to be scratched completely, the stripping layer is pulled by a tensile testing machine in the direction of 180 degrees at the speed of 100mm/min, a point is taken when the material is stripped at a constant speed, the minimum value is taken, and the peeling strength between the EVA and the back plate is judged to be qualified if 40N/cm.
The test results are shown in table 1:
table 1 Performance test results of graphene/polymer sheet antistatic films provided in examples 1 to 5 and comparative examples 1 to 2
Figure BDA0001921234060000081
Figure BDA0001921234060000091
As can be seen from Table 1, the back sheet provided by the invention can obviously improve the adhesion with EVA only by modifying unmodified PVDF/PET/PVDF, and does not influence the weather resistance of the back sheet, and meanwhile, the peel strength tests show that the adhesion reaches or exceeds the qualified standard, which proves that the method plays a good role in improving the adhesion of the PVDF back sheet and the EVA.
As can be seen from the test results of examples 4-5 and examples 1-3, the plasma bombardment conditions are as follows: bombarding by oxygen plasma, wherein the bombardment current is 50-60 mA, and the bombardment time is 20-25 min, so that the bonding strength between the oxygen plasma and EVA is better; the spraying conditions of the silane coupling agent solution are as follows: the volume content of the silane coupling agent is 2.5-3.5 v%, and the coating amount is 0.8-1.2 g/cm2And the bonding strength with EVA is better.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (9)

1. A photovoltaic back sheet is characterized by comprising a PET layer, a first material layer and a second material layer, wherein the first material layer and the second material layer are respectively arranged on two sides of the PET layer;
the first material layer is a PVDF layer with the surface containing a silane coupling agent;
the first material layer is used for bonding with an EVA (ethylene vinyl acetate) layer of a solar cell module.
2. The photovoltaic backsheet according to claim 1, wherein the second material layer is a PVDF layer, preferably one having hydroxyl groups grafted to the surface thereof by silanol bonds.
3. The photovoltaic backsheet according to claim 2, wherein said PVDF layer having a surface grafted with hydroxyl groups through silanol bonds has a degree of grafting of the hydroxyl groups of 100%.
4. The photovoltaic backsheet according to any one of claims 1 to 3, wherein the photovoltaic backsheet is prepared by a process comprising:
(1) providing a substrate, wherein the substrate comprises a PET layer, and a first raw material layer and a second raw material layer which are respectively arranged on two sides of the PET layer; the first raw material layer is an unmodified PVDF layer; subjecting a first raw material layer of the substrate to plasma bombardment;
(2) and coating a silane coupling agent solution on the surface of one side of the first raw material layer of the substrate bombarded by the plasma, and drying to obtain the back plate.
5. The photovoltaic backsheet according to any one of claims 2 to 3, wherein the photovoltaic backsheet is prepared by a process comprising:
(1) providing a substrate, wherein the substrate comprises a PET layer, and a first raw material layer and a second raw material layer which are respectively arranged on two sides of the PET layer; the first raw material layer and the second raw material layer are both unmodified PVDF layers; carrying out plasma bombardment on the first raw material layer and the second raw material layer of the substrate;
(2) and coating silane coupling agent solution on the surface of one side of the first raw material layer and the surface of one side of the second raw material layer of the substrate after the plasma bombardment, and drying to obtain the back plate.
6. The photovoltaic backsheet of claim 4 or 5, wherein the plasma bombardment comprises oxygen plasma bombardment;
preferably, the bombardment condition of the oxygen plasma is that the bombardment current is 50-60 mA, and the bombardment time is 20-25 min;
preferably, the subjecting of the substrate to plasma bombardment specifically comprises:
placing the substrate in a vacuum chamber, performing electrode pressurization discharge while filling oxygen, ionizing the oxygen, and bombarding the PVDF surface by positively charged ions under the action of an electric field to obtain a substrate with hydroxyl on the surface;
preferably, the amount of oxygen charged is 6.0 × 10 at a pressure to the vacuum chamber-2Pa。
7. The photovoltaic backsheet according to any one of claims 4 to 6, wherein the silane coupling agent solution contains 2.5 to 3.5% by volume of the silane coupling agent;
preferably, the silane coupling agent is 3-aminopropyltriethoxysilane;
preferably, the solvent of the silane coupling agent solution is ethanol and/or water, and the volume ratio is preferably 2.8-3.2: 1;
preferably, the pH value of the silane coupling agent solution is 3.8-4.2, preferably 4.0;
preferably, the preparation process of the silane coupling agent solution is as follows: mixing a silane coupling agent, water and ethanol, adjusting the pH value, and stirring to obtain the silane coupling agent;
preferably, the stirring temperature is 43-47 ℃ and the stirring time is 22-26 h.
8. The photovoltaic back sheet according to any one of claims 4 to 7, wherein the coating is performed by any one of 1 of spraying, soaking and brushing, preferably spraying;
preferably, the coating amount is 0.8-1.2 g/cm2。
9. A photovoltaic module is characterized by comprising tempered glass, a first EVA layer, a solar cell, a second EVA layer and the photovoltaic back plate of any one of claims 1-8 in sequence along a light incidence direction.
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