Water-blocking and oxygen-blocking adhesive film for packaging photovoltaic module and preparation method of water-blocking and oxygen-blocking adhesive film

Abstract

The invention belongs to the technical field of packaging adhesive films for photovoltaic modules, and particularly relates to a water-blocking and oxygen-blocking adhesive film for photovoltaic module packaging and a preparation method of the water-blocking and oxygen-blocking adhesive film for photovoltaic module packaging, and the water-blocking and oxygen-blocking adhesive film comprises a water-blocking layer and an oxygen-blocking layer which are adjacent to each other through co-extrusion; wherein the waterproof layer is prepared from the following materials in parts by mass: 100 parts of grafted polyolefin resin, 0.05 to 0.5 part of alkaline nano oxide and 0.1 to 1 part of antioxidant; the oxygen barrier layer is prepared from the following materials in parts by mass: 100 parts of oxygen barrier resin, 0.1-1 part of an oxygen absorbent, 0.1-1 part of a silane coupling agent and 0.05-0.5 part of a light conversion agent; the oxygen-resistant resin comprises any one or a combination of more of PS (polystyrene), PE (polyethylene), PET (polyethylene terephthalate), PB (polybutylene), PP (polypropylene), PVC (polyvinyl chloride), PVDC (polyvinyl dichloride), PA6 (polyamide 6) and EVOH (ethylene-vinyl alcohol).

Description

Technical Field

[0001] The invention belongs to the technical field of packaging adhesive films for photovoltaic modules, and in particular relates to a water- and oxygen-blocking adhesive film for photovoltaic module packaging and a preparation method thereof. Background Art

[0002] In the past five years, with the rapid expansion of the photovoltaic industry, the domestic demand for polyolefin resins has increased year by year. With the iteration and update of solar cells, the traditional P-type PREC cells have gradually been replaced by new N-type TOPCON, heterojunction cells and XBC cells. Some new batteries are more sensitive to water vapor, oxygen, etc. because the slurry is in a metastable state.

[0003] At present, photovoltaic modules are used Figure 1 In the multi-layer packaging solution of front glass, film, battery, film, and back glass shown in the figure, the back glass opening and the glass edge are weak locations of the packaging. During the aging process, they are easily channels for water vapor to enter, causing water vapor to accumulate there, and then initiating oxidation corrosion of the components.

[0004] As a new type of battery, heterojunction battery can easily cause photo-aging of the battery due to its TCO film layer and amorphous silicon film layer absorbing ultraviolet rays. In order to solve the problems of ultraviolet absorption and low current, most of them currently adopt the front film light conversion film packaging solution. The light conversion film mainly converts the ultraviolet band into the blue light spectrum near 450nm by adding light conversion materials. After the light conversion, the battery current is enhanced. However, current tests have found that the light conversion agent is naturally sensitive to oxygen. In particular, it was found in the dry heat aging test process that after aging for 200 hours under 150℃ air conditions, the light conversion film will lose its light conversion effect due to oxidation of the light conversion agent, resulting in a serious decrease in the power generation efficiency of the module. The photovoltaic encapsulation films currently used in large quantities, whether POE or EVA, do not have high oxygen barrier capabilities.

[0005] Therefore, how to overcome the defect that the light conversion agent of the packaging film for heterojunction cells is easily oxidized is a technical problem that needs to be solved urgently in this field.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiments of the present disclosure at least provide a water- and oxygen-barrier adhesive film for photovoltaic module encapsulation and a preparation method thereof.

[0008] In the first aspect, the embodiments of the present disclosure provide a water- and oxygen-barrier adhesive film for photovoltaic module encapsulation, comprising: co-extruded adjacent water-barrier layer and oxygen-barrier layer; wherein the water-barrier layer comprises, by mass: 100 parts of grafted polyolefin resin, 0.05-0.5 parts of alkaline nano-oxide, and 0.1-1 parts of antioxidant; the oxygen-barrier layer comprises, by mass: 100 parts of oxygen-barrier resin, 0.1-1 parts of oxygen absorber, 0.1-1 parts of silane coupling agent, and 0.05-0.5 parts of light conversion agent; the oxygen-barrier resin comprises any one or more combinations of PS, PE, PET, PB, PP, PVC, PVDC, PA6 and EVOH.

[0009] In an optional embodiment, the grafted polyolefin resin comprises, by mass, 100 parts of polyolefin resin, 0.1-1 parts of peroxide, and 1-10 parts of grafted silane coupling agent.

[0010] In an optional embodiment, the polyolefin resin comprises any one or a combination of POE resin and POP resin; and the polyolefin resin has a melt index of 3-15 g / 10 min and a melting point of 50-100° C.

[0011] In an optional embodiment, the grafted silane coupling agent includes any one or more combinations of vinyl trimethoxy silane, vinyl triethoxy silane, γ-glycidyloxypropyl trimethoxy silane and γ-methacryloxypropyl trimethoxy silane.

[0012] In an optional embodiment, the ratio of the single layer thickness of the water-blocking layer to the single layer thickness of the oxygen-blocking layer is 1:1-5.

[0013] In an optional embodiment, the alkaline nano-oxide includes any one or more combinations of magnesium oxide, aluminum hydroxide, zirconium oxide, aluminum oxide, zinc oxide, zinc acetate, aluminum hydroxide, zinc hydroxide, hydrotalcite, zeolite, molecular sieve, calcium lactate, and barium oxide.

[0014] In an optional embodiment, the oxygen absorbent includes any one or more combinations of Fe powder, Al powder, alumina, molecular sieves and single-walled carbon nanotubes;

[0015] In an optional embodiment, the silane coupling agent includes any one or more combinations of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, methacryloxypropyltrimethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane and aminopropyltriisopropoxysilane.

[0016] In an optional embodiment, the light conversion agent includes any one or more combinations of rare earth light conversion agents, inorganic light conversion agents and organic light conversion agents; the organic light conversion agent includes any one of benzothiazolyl, benzoxazinyl, quinazoline, quinolyl, isoquinolyl, quinoxalinyl, pyridyl, pyridazinyl, pyrimidinyl and pyrrolyl as the parent light conversion agent.

[0017] In an optional embodiment, the water- and oxygen-barrier film for photovoltaic module encapsulation includes: a double-layer structure with a single-sided water-barrier layer as the surface layer and an oxygen-barrier layer as the core layer, or a three-layer structure with double-sided water-barrier layers as the surface layer and an oxygen-barrier layer as the core layer.

[0018] In the second aspect, the embodiment of the present disclosure also provides a method for preparing a water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation as described above, comprising the following steps: step S1, uniformly mixing a polyolefin resin, a peroxide and a silane coupling agent in proportion, absorbing until the surface is dry under an environment of 50 to 60°C, placing the mixture in a granulator for grafting and granulation under a temperature condition of 150 to 180°C, and obtaining a grafted polyolefin resin after cooling, pelletizing and drying; step S2, uniformly mixing a water-blocking layer and an oxygen-blocking layer according to the above-mentioned formula ratio, passing through a screw extruder after absorption, controlling the ratio of the surface layer to the core layer and the extrusion temperature, and then obtaining a water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation after casting, embossing, cooling and winding.

[0019] The beneficial effect of the present invention is that the water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation and the preparation method thereof adopt a surface layer thermoplastic water-blocking resin and a core layer oxygen-blocking resin to achieve the combination of oxygen-blocking and water-blocking effects without affecting the light transmittance and adhesion of the film, and can be used for comprehensive encapsulation of components or encapsulation protection of wiring holes. At the same time, the oxygen-blocking resin is used to coat the light-converting agent, and the defect of high melting point and low flowability that is not suitable for encapsulation is converted into the advantage of avoiding migration of the light-converting agent and other additives, thereby ensuring the long-term and reliable operation of the component.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a double-layered water- and oxygen-blocking film for photovoltaic module encapsulation provided in an embodiment of the present disclosure;

[0024] Figure 2 A schematic structural diagram of a three-layer water- and oxygen-blocking film for photovoltaic module encapsulation provided in an embodiment of the present disclosure.

[0025] In the figure:

[0026] 1. Water barrier layer; 2. Oxygen barrier layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0029] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0030] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0031] Glossary:

[0032] PS polystyrene, PE polyethylene, PET polyethylene terephthalate, PB polybutene, PP polypropylene, PVC polyvinyl chloride, PVDC polyvinylidene chloride, PA polyamide and EVOH ethylene-vinyl alcohol copolymer.

[0033] As a non-polar vinyl polymer elastomer plastic, polyolefin resin has the natural advantages of low water vapor permeability and high volume resistivity compared to existing EVA resin. At the same time, since polyolefin resin has no VA side chains, no acidic small molecules are precipitated during the hydrothermal aging process, which can effectively isolate water vapor, reduce grid line corrosion of the cell, and play a good protective role in the long-term stable operation of the component. At present, it has become a large-scale application in the packaging of new photovoltaic cells.

[0034] Existing high oxygen barrier resins including PS, PE, PET, PB, PP, PVC, PVDC, PA, EVOH and other resins have excellent oxygen barrier properties, but because of their high melting point and poor fluidity, they are not suitable for packaging applications of photovoltaic modules.

[0035] To achieve water and oxygen barrier functions:

[0036] CN201910349077.2 discloses an oxygen-barrier composite film and a preparation method thereof, wherein the oxygen-barrier composite film comprises a heat-sealing layer, a barrier layer and a support layer which are sequentially stacked, wherein the heat-sealing layer comprises a film layer formed of PETG, the barrier layer comprises at least one first barrier film layer formed of EVOH and / or at least one second barrier film layer formed of PA, and the support layer comprises a biaxially stretched film, wherein the heat-sealing layer and the barrier layer, as well as the barrier layer and the support layer, are melt co-extruded and composited through an adhesive layer.

[0037] CN220579171U discloses a photovoltaic encapsulation film, which includes a first film layer and a second film layer, wherein the second film layer is located on one side of the first film layer. The water vapor permeability of the first film layer is lower than that of the second film layer, and the width of the first film layer is larger than that of the second film layer. By providing multiple film layers and providing film layers with different water vapor permeabilities and widths, the water vapor barrier performance of the photovoltaic encapsulation film is improved.

[0038] The above solution can only achieve one of the effects of water blocking and oxygen blocking, and cannot truly achieve long-term operation for outdoor scenarios where photovoltaic modules are used.

[0039] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems below should be the contributions made by the inventor to the present disclosure during the disclosure process.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0042] The embodiment of the present disclosure provides a water- and oxygen-barrier film for photovoltaic module encapsulation, comprising: co-extruded adjacent water-barrier layer and oxygen-barrier layer; wherein the water-barrier layer comprises, by mass, 100 parts of grafted polyolefin resin, 0.05-0.5 parts of alkaline nano-oxide, and 0.1-1 parts of antioxidant; the oxygen-barrier layer comprises, by mass, 100 parts of oxygen-barrier resin, 0.1-1 parts of oxygen absorbent, 0.1-1 parts of silane coupling agent, and 0.05-0.5 parts of light conversion agent; the oxygen-barrier resin comprises any one or more combinations of PS, PE, PET, PB, PP, PVC, PVDC, PA6, and EVOH.

[0043] In some embodiments, specifically, the grafted polyolefin resin comprises, by weight: 100 parts of polyolefin resin, 0.1-1 parts of peroxide, and 1-10 parts of grafted silane coupling agent.

[0044] In some embodiments, specifically, the polyolefin resin includes any one or a combination of POE resin and POP resin; and the polyolefin resin has a melt index of 3-15 g / 10 min and a melting point of 50-100° C.

[0045] In some embodiments, specifically, the grafted silane coupling agent includes any one or more combinations of vinyl trimethoxy silane, vinyl triethoxy silane, γ-glycidyloxypropyl trimethoxy silane and γ-methacryloxypropyl trimethoxy silane.

[0046] In some embodiments, specifically, the ratio of the single layer thickness of the water-blocking layer to the single layer thickness of the oxygen-blocking layer is 1:1-5.

[0047] In some embodiments, specifically, the alkaline nano-oxide includes any one or more combinations of magnesium oxide, aluminum hydroxide, zirconium oxide, aluminum oxide, zinc oxide, zinc acetate, aluminum hydroxide, zinc hydroxide, hydrotalcite, zeolite, molecular sieve, calcium lactate, and barium oxide.

[0048] In some embodiments, specifically, the oxygen absorbent includes any one or more combinations of Fe powder, Al powder, alumina, molecular sieves and single-walled carbon nanotubes.

[0049] In some embodiments, specifically, the silane coupling agent includes any one or more combinations of vinyl triethoxy silane, vinyl trimethoxy silane, vinyl tri(β-methoxyethoxy) silane, methacryloxypropyl trimethoxy silane, aminopropyl trimethoxy silane, aminopropyl triethoxy silane and aminopropyl triisopropoxy silane.

[0050] In some embodiments, specifically, the light conversion agent includes any one or more combinations of rare earth light conversion agents, inorganic light conversion agents and organic light conversion agents; the organic light conversion agent includes any one of benzothiazolyl, benzoxazinyl, quinazoline, quinolyl, isoquinolyl, quinoxalinyl, pyridyl, pyridazinyl, pyrimidinyl and pyrrolyl as the parent light conversion agent.

[0051] In some embodiments, specifically, the water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation includes: a double-layer structure with a single-sided water-blocking layer as the surface layer and an oxygen-blocking layer as the core layer, that is, an AB structure; a three-layer structure with two-sided water-blocking layers as the surface layer and an oxygen-blocking layer as the core layer, that is, an ABA structure.

[0052] In some embodiments, specifically, a double-layer structure with a single-sided water-blocking layer as the surface layer and an oxygen-blocking layer as the core layer may further include a conventional adhesive film disposed on the other side of the oxygen-blocking layer to form an ABC structure.

[0053] The disclosed embodiment also provides a method for preparing the water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation as described above, comprising the following steps: step S1, uniformly mixing the polyolefin resin, peroxide and silane coupling agent in proportion, absorbing until the surface is dry under an environment of 50-60°C, placing in a granulator for grafting and granulation under a temperature condition of 150-180°C, and obtaining the grafted polyolefin resin after cooling, pelletizing and drying; step S2, uniformly mixing the water-blocking layer and the oxygen-blocking layer according to the above-mentioned formula ratio, passing through a screw extruder after absorption, controlling the ratio of the surface layer to the core layer and the extrusion temperature, and then obtaining the water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation after casting, embossing, cooling and winding.

[0054] Example 1

[0055] Step S1, preparation of grafted polyolefin resin, the specific mass fractions are shown in Table 1 below:

[0056] Table 1 Grafted polyolefin resin components

[0057]

[0058] The polyolefin resin, peroxide and silane are mixed evenly in the above proportions, absorbed at 55°C until the surface is dry, placed in a granulator at 150-180°C for grafting and granulation, and the grafted polyolefin resin is obtained after cooling, pelletizing and drying.

[0059] Step S2, preparation of water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation, the specific mass fractions are as shown in Table 2 and Table 3 below:

[0060] Table 2 Water-blocking layer components

[0061] Grafted polyolefin resin 100 copies Nano zinc oxide 0.05 Antioxidant 1010 0.1 part

[0062] Table 3 Oxygen barrier layer components

[0063]

[0064] The water barrier layer and the oxygen barrier layer are mixed evenly according to the above formula ratio, and after absorption, the surface layer and the extrusion temperature are controlled in an ABA type screw extruder, and then the film is cast, embossed, cooled and rolled to obtain the following Figure 1 The water- and oxygen-barrier adhesive film for photovoltaic encapsulation is shown.

[0065] Example 2

[0066] Step S1, preparation of grafted polyolefin resin, the polyolefin resin as in Example 1, peroxide and silane are mixed uniformly in the above proportions, absorbed at 50-60°C until surface drying, placed in a granulator at 150-180°C for grafting and granulation, and the grafted polyolefin resin is obtained after cooling, pelletizing and drying.

[0067] Step S2, preparation of water-blocking and oxygen-blocking film for photovoltaic module encapsulation, mixing the water-blocking layer and the oxygen-blocking layer as in Example 1 evenly according to the above formula ratio, and after absorption, extruding in an ABA type screw extruder, controlling the interlayer surface core layer and extrusion temperature, and then casting, embossing, cooling, and winding to obtain Figure 2 The water- and oxygen-barrier adhesive film for photovoltaic encapsulation is shown.

[0068] Specifically, some components in Examples 1 and 2 were adjusted to obtain a high-transmittance and corrosion-resistant photovoltaic encapsulation film. The test results are shown in Table 4 below. The test results are obtained after the photovoltaic module is fully encapsulated.

[0069] Water vapor transmission rate test method: Reference national standard: GB / T1027-2008

[0070] Oxygen transmission rate test method: Reference national standard: GB / T 19789-2005

[0071] PCT96h acid value test: Reference standard: T / CPIA0073-2024 Test method for acid content in encapsulation film for photovoltaic modules

[0072] 150℃, 200h light transmittance test:

[0073] Sample preparation and testing methods

[0074] a. Preparation of double glass laminate: Prepare 2 pieces of 30mm×30mm coated rolled semi-tempered glass:

[0075] b. Stack glass → packaging film (2 pieces) → glass in sequence;

[0076] c. Place the film in a laminator and perform curing and cross-linking according to the curing temperature and time required by the encapsulation film product to obtain a laminate without appearance defects, and the degree of cross-linking of the encapsulation film after lamination should reach more than 80%;

[0077] d. According to the relevant aging conditions in IEC61215-2:2021 and GB / T 41203-2021 standards, place the samples in the test box and age them at 150°C for 200 hours; if aging is not required, directly place the laminated components in a UV-Vis spectrophotometer to test the average transmittance at 280-380nm;

[0078] e. After aging, cool the sample to room temperature, then place it in a UV-Vis spectrophotometer and test it according to GB / T2410-2008 Clause 7.2 Method B: Spectrophotometer Method. The wavelength range of the spectrophotometer is set to 280nm to 380nm. At least 3 samples are tested in each group, and the results are averaged.

[0079] Module power gain test:

[0080] 1. First, prepare the solar cells and conventional films (commercially available conventional EVA / EPE / POE films, the performance of which meets the GB / T29848-2013 standard) into photovoltaic modules according to standard components, and keep the prepared photovoltaic modules in a 25℃ room for one day to ensure that the surface temperature of the modules is 25±1℃. First, calibrate the power tester with a standard plate, then test the initial power of the prepared modules and record it. The average value of the three tests is taken as the initial power generation power of the sample, which is Pmax1.

[0081] 2. Prepare the solar cells and water- and oxygen-blocking films into photovoltaic modules according to standard modules, and keep the prepared photovoltaic modules in a 25℃ room for one day to ensure that the module surface temperature is 25±1℃. First, calibrate the power tester with a standard board, then test the initial power of the prepared module and record it. The average value of the three tests is taken as the initial power generation power of the sample, which is Pmax2.

[0082] Component power gain = (Pmax2 - Pmax1) / Pmax1*100%.

[0083] Table 4

[0084]

[0085]

[0086] Specifically, the comparative example is to remove the oxygen barrier layer on the basis of Example 10, and add the light conversion agent into the water barrier layer. The formula of the water barrier layer is shown in Table 5 below.

[0087] Table 5 Water-blocking layer components

[0088] Grafted polyolefin resin 100 copies Nano magnesium hydroxide 0.1 part Antioxidant 1010 0.1 part Quinazoline-based light conversion agents 0.15

[0089] Specifically, in the comparative example without an oxygen barrier layer, both the oxygen permeability and the acid value increased significantly, resulting in an increase in the ultraviolet transmittance and a decrease in the component gain power. This is because the light conversion agent reacts with oxygen in the water barrier layer to reduce the light conversion efficiency.

[0090] Specifically, the water-barrier and oxygen-barrier resins are rationally co-extruded by adopting multi-layer co-extrusion technology, and the oxygen-barrier and water-barrier are combined without affecting the light transmittance and adhesion of the film, so that the film has lower water vapor permeability and oxygen permeability. Experimental tests show that by introducing an oxygen barrier layer, the oxygen permeability of the film is greatly reduced, and the minimum can be below 5%, thereby avoiding the oxidation of the light transfer agent in the film. In the experimental test, in the 150°C, 200h heat drying test, the transmittance at 280-380nm is maintained at 20%, which effectively guarantees the power gain of the component. It can provide more reliable packaging protection for the component when used for full component packaging or wiring hole position packaging, and reduce the erosion of oxygen and water vapor to the battery and the film.

[0091] In summary, the water-blocking and oxygen-blocking adhesive film for photovoltaic module encapsulation and its preparation method adopt a surface layer of thermoplastic water-blocking resin and a core layer of oxygen-blocking resin to achieve the combination of oxygen-blocking and water-blocking effects without affecting the light transmittance and adhesion of the film. It can be used for full encapsulation of components or encapsulation protection of wiring holes. At the same time, the oxygen-blocking resin is used to coat the light-converting agent, and the defect of high melting point and low flowability that is not suitable for encapsulation is converted into the advantage of avoiding migration of light-converting agents and other additives, thereby ensuring the long-term and reliable operation of the components.

[0092] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A water- and oxygen-blocking film for photovoltaic module encapsulation, characterized in that: include: Co-extrude adjacent water barrier layer and oxygen barrier layer; in The water-blocking layer comprises, by mass: 100 parts of grafted polyolefin resin, 0.05-0.5 parts of alkaline nano oxide, 0.1-1 parts of antioxidant; The oxygen barrier layer comprises, by mass: 100 parts of oxygen barrier resin, 0.1-1 parts of oxygen absorbent, 0.1-1 parts of silane coupling agent, 0.05-0.5 parts of light conversion agent; The oxygen barrier resin includes any one or more combinations of PS, PE, PET, PB, PP, PVC, PVDC, PA6 and EVOH.

2. The water- and oxygen-blocking film for photovoltaic module encapsulation according to claim 1, characterized in that: The grafted polyolefin resin comprises, by mass: 100 parts of polyolefin resin, 0.1-1 parts of peroxide, and 1-10 parts of grafted silane coupling agent.

3. The water- and oxygen-blocking film for photovoltaic module encapsulation according to claim 2, characterized in that: The resin comprises any one or a combination of POE resin and POP resin; and The polyolefin resin has a melt index of 3-15 g / 10 min and a melting point of 50-100° C.

4. The water- and oxygen-blocking film for photovoltaic module encapsulation according to claim 2, characterized in that: The grafted silane coupling agent includes any one or more combinations of vinyl trimethoxysilane, vinyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane and γ-methacryloxypropyl trimethoxysilane.

5. The water- and oxygen-barrier film for photovoltaic module encapsulation according to claim 1, characterized in that: The ratio of the single layer thickness of the water-blocking layer to the single layer thickness of the oxygen-blocking layer is 1:1-5.

6. The water- and oxygen-blocking film for photovoltaic module encapsulation according to claim 1, characterized in that: The alkaline nano oxide includes any one or more combinations of magnesium oxide, aluminum hydroxide, zirconium oxide, aluminum oxide, zinc oxide, zinc acetate, aluminum hydroxide, zinc hydroxide, hydrotalcite, zeolite, molecular sieve, calcium lactate, and barium oxide.

7. The water- and oxygen-blocking film for photovoltaic module encapsulation according to claim 1, characterized in that: The oxygen absorbent comprises any one or more combinations of Fe powder, Al powder, alumina, molecular sieves and single-walled carbon nanotubes; The silane coupling agent includes any one or more combinations of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri(β-methoxyethoxy)silane, methacryloxypropyl trimethoxysilane, aminopropyl trimethoxysilane, aminopropyl triethoxysilane and aminopropyl triisopropoxysilane.

8. The water- and oxygen-barrier film for photovoltaic module encapsulation according to claim 1, characterized in that: The light conversion agent includes any one or more combinations of rare earth light conversion agents, inorganic light conversion agents and organic light conversion agents; The organic light conversion agent includes a light conversion agent having any one of benzothiazolyl, benzoxazinyl, quinazoline, quinolyl, isoquinolyl, quinoxalinyl, pyridyl, pyridazinyl, pyrimidinyl and pyrrolyl as the parent.

9. The water- and oxygen-barrier film for photovoltaic module encapsulation according to claim 1, characterized in that: The water- and oxygen-blocking adhesive film for photovoltaic module encapsulation comprises: A double-layer structure with a single-sided water-blocking layer as the surface layer and an oxygen-blocking layer as the core layer; a three-layer structure with two-sided water-blocking layers as the surface layer and an oxygen-blocking layer as the core layer.

10. A method for preparing a water- and oxygen-blocking film for photovoltaic module encapsulation according to any one of claims 1 to 9, characterized in that: The steps include: Step S1, uniformly mixing a polyolefin resin, a peroxide and a silane coupling agent in a certain proportion, absorbing them at 50-60° C. until the surface is dry, placing them in a granulator at 150-180° C. for graft granulation, cooling, granulating and drying to obtain a grafted polyolefin resin; Step S2, the water barrier layer and the oxygen barrier layer are mixed evenly according to the above formula ratio, and after absorption, they are passed through a screw extruder to control the interlayer surface-core layer ratio and the extrusion temperature, and then cast, embossed, cooled, and rolled to obtain a water barrier and oxygen barrier film for photovoltaic module encapsulation.

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