Photovoltaic isolation protection glue and application thereof

Abstract

The invention provides photovoltaic isolation protection glue and application thereof. The photovoltaic isolation protection glue is prepared from the following components in parts by mass: 5 to 70 parts of unsaturated bond-containing monomer, 5 to 60 parts of prepolymer and 0.1 to 10 parts of photoinitiator. Through design and mutual compounding of the components, the photovoltaic isolation protection glue has low viscosity and appropriate surface tension, can realize high-precision coating processes such as ink-jet printing and the like, can embed a two-dimensional code during precise coating, and supports single-chip code printing tracing; moreover, a protective film formed by curing the photovoltaic isolation protective glue is high in light transmittance, has excellent high temperature resistance and acid and alkali resistance, and can ensure that a photovoltaic battery keeps excellent photoelectric conversion performance while providing a stable and effective protection effect on a battery piece.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic protective adhesives, and in particular relates to a photovoltaic isolation protective adhesive and an application thereof. Background Art

[0002] Photovoltaic back-contact cells utilize a technology that places the positive and negative electrodes on the back of the cell. This unobstructed front surface increases the effective illuminated area of the module and improves photoelectric conversion efficiency. Photovoltaic back-contact cells have attracted significant attention in the photovoltaic industry due to their high efficiency and aesthetically pleasing frontal appearance. Because the front of photovoltaic back-contact cells lacks metal electrodes or obstructions, they can easily rub against other objects during subsequent processing and other movement of the module, causing damage. This can affect light absorption and, in turn, the cell's power generation efficiency. Therefore, protecting the front of back-contact cells is essential.

[0003] In order to reduce the risk of damage to the front of the battery cells, isolation paper is usually placed between the battery cells to protect the individual battery cells from being scratched during the manufacturing and moving process. However, the isolation paper needs to be repeatedly configured and removed in the subsequent production and testing of the battery assembly. This not only requires the use of a large amount of isolation paper and increases the cost of consumables, but also reduces the production efficiency of the battery assembly.

[0004] In recent years, the industry has proposed using protective films instead of release paper to protect the front of solar cells. For example, CN119490803A discloses a solar cell front-side protective film comprising a first and second cell protective films stacked in sequence. The first cell protective film, made from a polyacrylate adhesive, directly contacts the light-receiving surface of the solar cell body; the second cell protective film is made from a silicone adhesive. Compared to release paper, protective films have better adhesion to the cell, eliminating the need for repeated application and removal, and thus minimizing the negative impact on battery assembly production efficiency.

[0005] Photovoltaic back-contact cells need to undergo strong acid and alkali treatments during the electroplating metallization process to complete steps such as surface cleaning, electroplating, and mask removal. In the prior art, a protective film is usually applied after the metallization process to prevent physical damage to the cells during stacking, transportation, and use. However, existing protective films are prone to degradation and failure in the harsh chemical environments of the electroplating process, such as acid, alkali, and high temperature, and have low light transmittance, which affects the photoelectric conversion efficiency of the cells. In addition, the protective film is obtained by coating and curing glue, which is limited by factors such as the viscosity and surface tension of the glue. The current coating process is mainly spraying, which cannot meet high-precision coating requirements and cannot achieve single-chip coding and traceability, limiting quality management during the battery production process.

[0006] Therefore, developing a photovoltaic protective adhesive that has high light transmittance, good acid and alkali resistance, good high temperature resistance, and can be coated with high precision is an urgent problem to be solved in this field. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an isolation protective adhesive for photovoltaics and its application. Through the design and mutual compounding of the components, the isolation protective adhesive for photovoltaics has low viscosity and suitable surface tension, can realize high-precision coating processes such as inkjet printing, and can embed QR codes while accurately coating, supporting single-piece coding and traceability; moreover, the protective film formed by the curing of the isolation protective adhesive for photovoltaics has high light transmittance, excellent high temperature resistance and acid and alkali resistance, and can provide stable and effective protection to the battery cells while ensuring that the photovoltaic cells maintain excellent photoelectric conversion performance.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a photovoltaic isolation and protection adhesive, wherein the photovoltaic isolation and protection adhesive comprises the following components in parts by mass:

[0010] 5-70 parts of unsaturated bond monomer

[0011] 5-60 parts of prepolymer

[0012] Photoinitiator 0.1-10 parts.

[0013] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0014] As a preferred technical solution of the present invention, the unsaturated bond-containing monomer includes any one of an acrylate monomer, a fluorine-containing acrylate monomer, and an unsaturated bond-containing siloxane monomer, or a combination of at least two thereof.

[0015] As a preferred technical solution of the present invention, the unsaturated bond-containing monomer includes a fluorine-containing acrylic ester monomer and / or an unsaturated bond-containing siloxane monomer, and optionally an acrylic ester monomer.

[0016] As a preferred technical solution of the present invention, the acrylic acid ester monomer includes any one or a combination of at least two of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isobornyl (meth)acrylate, and methoxy polyethylene glycol (meth)acrylate.

[0017] As a preferred technical solution of the present invention, the fluorine-containing acrylate monomer includes any one of perfluoroalkyl acrylate, heptafluorobutyl (meth)acrylate, and trifluoroethyl (meth)acrylate, or a combination of at least two thereof.

[0018] As a preferred technical solution of the present invention, the unsaturated bond-containing siloxane monomer includes any one of (meth)acryloxypropyltrimethoxysilane, (meth)acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, or a combination of at least two thereof.

[0019] As a preferred technical solution of the present invention, the prepolymer includes any one or a combination of at least two of polyurethane (meth) acrylate, epoxy (meth) acrylate prepolymer, polyester (meth) acrylate, polyether (meth) acrylate, and silane-modified prepolymer.

[0020] Preferably, the silane-modified prepolymer includes a silane-modified polyurethane prepolymer.

[0021] As a preferred technical solution of the present invention, the number average molecular weight of the prepolymer is 3000-12000 g / mol.

[0022] As a preferred technical solution of the present invention, the photoinitiator includes any one or a combination of at least two of a benzophenone photoinitiator, a benzophenone photoinitiator, a benzoin ether photoinitiator, and an acylphosphine oxide photoinitiator, preferably any one or a combination of at least two of benzophenone (BP), 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), and ethyl 2,4,6-trimethylbenzoylphosphonate (TPO).

[0023] As a preferred technical solution of the present invention, the photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass of a thermal initiator.

[0024] As a preferred technical solution of the present invention, the thermal initiator includes an azo initiator and / or an organic peroxide compound, preferably any one or a combination of at least two of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), di-tert-butyl peroxide (DTBP), and dicumyl peroxide (DCP).

[0025] As a preferred technical solution of the present invention, the photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass of an auxiliary agent.

[0026] As a preferred technical solution of the present invention, the auxiliary agent includes any one of a surfactant and an antioxidant, or a combination of at least two of them.

[0027] As a preferred technical solution of the present invention, the mass fractions of the surfactant and the antioxidant in the photovoltaic isolation protective glue are independently 0-3 parts, preferably 0-2.5 parts.

[0028] As a preferred technical solution of the present invention, the surfactant includes any one of polyether-modified polysiloxane and fluorine-containing surfactant, or a combination of at least two thereof.

[0029] As a preferred technical solution of the present invention, the antioxidant includes any one of hindered phenol antioxidants, hindered amine antioxidants, and phosphite antioxidants, or a combination of at least two of them.

[0030] As a preferred technical solution of the present invention, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0031]

[0032]

[0033] As another preferred technical solution of the present invention, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0034]

[0035] The functional monomer is an unsaturated bond-containing siloxane monomer and / or a fluorine-containing acrylate monomer.

[0036] As another preferred technical solution of the present invention, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0037]

[0038] As a preferred technical solution of the present invention, the viscosity of the photovoltaic isolation protective adhesive is 3-50 cps.

[0039] As a preferred technical solution of the present invention, the surface tension of the photovoltaic isolation protective adhesive is 15-50 mN / m, preferably 20-45 mN / m.

[0040] As a preferred technical solution of the present invention, the preparation method of the photovoltaic isolation protective adhesive includes: uniformly mixing unsaturated bond-containing monomers, prepolymers, photoinitiators, optional thermal initiators and optional auxiliary agents to obtain the photovoltaic isolation protective adhesive.

[0041] In another aspect, the present invention provides a use of the photovoltaic isolation protective adhesive as described in the first aspect in a photovoltaic cell.

[0042] In a third aspect, the present invention provides a photovoltaic cell, comprising a cell and an isolation protective film disposed on the surface of the cell, wherein the isolation protective film is prepared by the photovoltaic isolation protective adhesive as described in the first aspect.

[0043] As a preferred technical solution of the present invention, the photovoltaic cell is a back-contact cell, and the isolation protective film is arranged on the front side of the cell.

[0044] As a preferred technical solution of the present invention, the thickness of the isolation protection film is 1-40 μm.

[0045] In a fourth aspect, the present invention provides a method for preparing the photovoltaic cell as described in the third aspect, the preparation method comprising: applying the photovoltaic isolation protective glue as described in the first aspect to the surface of the cell, and UV curing to obtain the photovoltaic cell.

[0046] As a preferred technical solution of the present invention, the coating method includes inkjet printing.

[0047] As a preferred technical solution of the present invention, the energy of the UV curing is 500-15000mJ / cm 2 , preferably 500-12000mJ / cm 2 .

[0048] As a preferred technical solution of the present invention, the UV curing time is 0.1-10s.

[0049] As a preferred technical solution of the present invention, the UV curing further includes a thermal curing step.

[0050] As a preferred technical solution of the present invention, the temperature of the thermal curing is 80-280°C.

[0051] As a preferred technical solution of the present invention, the thermal curing time is 10-60 minutes.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) The photovoltaic isolation protective adhesive provided by the present invention has low viscosity and suitable surface tension through the design and compounding of components, and is highly adaptable to high-precision coating processes such as inkjet printing. While being precisely coated, a QR code can be embedded, supporting single-piece coding and traceability, thereby achieving management and control of production efficiency and quality.

[0054] (2) The present invention enables the photovoltaic isolation protective glue to be cured to obtain a high-density cross-linked network structure through the compounding and joint action of the components. The formed protective film has excellent high temperature resistance, acid and alkali resistance and chemical resistance, high stability, good durability and chemical resistance, and remains stable in an environment with a pH value of 1-14. It has a temperature resistance of ≥250°C and can provide long-lasting, stable and effective protection for the battery cells in harsh environments such as electroplating processes. At the same time, it has good mechanical properties and a transmittance of >99.95%. Its high transmittance can ensure that the photovoltaic cells maintain excellent photoelectric conversion efficiency. DETAILED DESCRIPTION

[0055] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0056] As used herein, the terms "comprises," "including," "having," "containing" or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a listed element is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0057] In the prior art, a protective adhesive film is used to protect the surface of the cell of the photovoltaic back contact battery to prevent physical damage to the cell during stacking, transportation and use. Photovoltaic back contact cells need to undergo strong acid and alkali treatment in the electroplating metallization process to complete the steps of surface cleaning, electroplating and mask removal. In the prior art, the protective adhesive is mostly applied to form an adhesive film after metallization; however, these protective adhesives are easily degraded and fail in the harsh chemical environment of the electroplating process, and have low light transmittance, which affects the photoelectric conversion efficiency of the battery. In addition, the viscosity and surface tension of the existing glue are not suitable for inkjet printing, and single-piece coding and traceability cannot be achieved, which limits the quality management in the production process. Based on this, the present invention provides an isolation protective adhesive for photovoltaics to match the high-precision coating requirements of inkjet printing and achieve single-piece coding and traceability; at the same time, the protective film formed by the isolation protective adhesive for photovoltaics has excellent high temperature resistance, acid and alkali resistance and high light transmittance, good durability and chemical resistance, and can provide stable and effective protection for the cell, and ensure that the photovoltaic cell maintains excellent photoelectric conversion performance.

[0058] One embodiment of the present invention provides a photovoltaic isolation protective adhesive, which includes the following components in parts by mass:

[0059] 5-70 parts of unsaturated bond monomer

[0060] 5-60 parts of prepolymer

[0061] Photoinitiator 0.1-10 parts.

[0062] In the present invention, the unsaturated bond-containing monomer can undergo a curing reaction to form a cross-linked network with excellent chemical corrosion resistance, the prepolymer can provide excellent mechanical strength and flexibility, and the photoinitiator can react quickly during UV curing and has little effect on the light transmittance of the cured product. Through the design and specific dosage of the unsaturated bond-containing monomer, prepolymer and photoinitiator, the photovoltaic isolation protective glue can be photocured to form a dense and stable cross-linked network structure. The obtained protective film has excellent high temperature resistance, acid and alkali resistance and chemical resistance, good stability, high light transmittance, and can provide stable and effective protection for the battery cell in harsh environments such as electroplating processes, protect the velvet surface of the battery cell for a long time in the electroplating metallization process, and ensure that the photovoltaic cell maintains excellent photoelectric conversion efficiency.

[0063] Moreover, the photovoltaic isolation protective adhesive has low viscosity and suitable surface tension, which can meet high-precision coating requirements such as inkjet printing, accurately coat and embed QR codes, support single-piece coding traceability, and improve quality control and data management capabilities during the production process.

[0064] In the photovoltaic isolation protective glue of the present invention, the mass parts of the unsaturated bond-containing monomer are 5-70 parts, for example, it can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or 65 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 10-70 parts.

[0065] The mass parts of the prepolymer are 5-60 parts, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or 55 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 10-50 parts.

[0066] The mass fraction of the photoinitiator is 0.1-10 parts, for example, it can be 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, as well as specific values between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range, preferably 0.5-5 parts.

[0067] In a specific embodiment, the unsaturated bond-containing monomer includes any one or a combination of at least two of an acrylate monomer, a fluorine-containing acrylate monomer, and an unsaturated bond-containing siloxane monomer; the unsaturated bond-containing monomer is compounded with components such as a prepolymer and a photoinitiator, and can be cured to form a chemically resistant network structure, forming a protective film with excellent acid and alkali resistance and high temperature resistance.

[0068] In a preferred embodiment, the unsaturated bond-containing monomer includes a fluorine-containing acrylic ester monomer and / or an unsaturated bond-containing siloxane monomer (i.e., includes at least one of a fluorine-containing acrylic ester monomer and an unsaturated bond-containing siloxane monomer), and optionally includes an acrylic ester monomer.

[0069] The fluorinated acrylate monomers provide excellent chemical stability, while the unsaturated siloxane monomers enhance heat resistance and flexibility. These acrylate monomers are low-cost and easily adjustable. In a preferred embodiment, the unsaturated monomers include at least one of, or a combination of, fluorinated acrylate monomers and unsaturated siloxane monomers, and optionally, an acrylate monomer. This allows the protective film formed by curing the photovoltaic isolation and protective adhesive to possess excellent high-temperature resistance, acid and alkali resistance, and chemical resistance, improving overall stability.

[0070] In a specific embodiment, the acrylic acid ester monomer includes any one or a combination of at least two of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isobornyl (meth)acrylate, and methoxy polyethylene glycol (meth)acrylate.

[0071] In the present invention, the term "methyl (meth)acrylate" refers to methyl methacrylate and / or methyl acrylate; the term "ethyl (meth)acrylate" refers to ethyl methacrylate and / or ethyl acrylate; and the term "methoxy polyethylene glycol (meth)acrylate" refers to methoxy polyethylene glycol methacrylate and / or methoxy polyethylene glycol acrylate. Similar expressions apply and are not detailed here for the sake of brevity.

[0072] Optionally, the number average molecular weight of the methoxy polyethylene glycol (meth)acrylate is 100-1500 g / mol, for example, it can be 150 g / mol, 200 g / mol, 250 g / mol, 300 g / mol, 350 g / mol, 400 g / mol, 450 g / mol, 500 g / mol, 600 g / mol, 800 g / mol, 1000 g / mol, 1200 g / mol, 1300 g / mol or 1400 g / mol, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0073] In a specific embodiment, the fluorine-containing acrylate monomer includes any one of perfluoroalkyl acrylate, heptafluorobutyl (meth)acrylate, and trifluoroethyl (meth)acrylate, or a combination of at least two thereof.

[0074] In a specific embodiment, the unsaturated bond-containing siloxane monomer includes any one or a combination of at least two of (meth)acryloxypropyltrimethoxysilane, (meth)acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane.

[0075] In the present invention, the term "(meth)acryloxypropyltrimethoxysilane" means methacryloxypropyltrimethoxysilane and / or acryloxypropyltrimethoxysilane; the term "(meth)acryloxypropyltriethoxysilane" means methacryloxypropyltriethoxysilane and / or acryloxypropyltriethoxysilane.

[0076] In a specific embodiment, the prepolymer includes any one or a combination of at least two of polyurethane (meth)acrylate, epoxy (meth)acrylate prepolymer, polyester (meth)acrylate, polyether (meth)acrylate, and silane-modified prepolymer.

[0077] In the present invention, the term "urethane (meth)acrylate" refers to polyurethane methacrylate and / or polyurethane acrylate; the term "polyester (meth)acrylate" refers to polyester methacrylate and / or polyester acrylate. Similar expressions apply and are omitted for brevity.

[0078] In this invention, the polyurethane (meth)acrylate exhibits excellent flexibility and chemical resistance; the epoxy (meth)acrylate prepolymer exhibits excellent hardness and heat resistance; the polyester (meth)acrylate offers low cost and good processability; and the silane-modified prepolymer enhances high-temperature resistance and acid and alkali resistance. Through the design of the prepolymer and its combination with components such as unsaturated bond-containing monomers and photoinitiators, the protective film formed by curing the photovoltaic isolation protective adhesive exhibits excellent mechanical strength and flexibility, while also demonstrating good stability in terms of heat resistance, acid and alkali resistance, and other properties.

[0079] Optionally, the silane-modified prepolymer includes a silane-modified polyurethane prepolymer.

[0080] In a specific embodiment, the number average molecular weight of the prepolymer is 3000-12000 g / mol, for example, it can be 3500 g / mol, 4000 g / mol, 4500 g / mol, 5000 g / mol, 5500 g / mol, 6000 g / mol, 6500 g / mol, 7000 g / mol, 7500 g / mol, 8000 g / mol, 8500 g / mol, 9000 g / mol, 9500 g / mol, 10000 g / mol, 10500 g / mol, 11000 g / mol or 11500 g / mol, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0081] For example, the number average molecular weight in the present invention is measured by gel permeation chromatography (GPC, polystyrene standard).

[0082] In a specific embodiment, the photoinitiator includes any one or a combination of at least two of a benzophenone photoinitiator, a benzophenone photoinitiator, a benzoin ether photoinitiator, and an acylphosphine oxide photoinitiator, preferably any one or a combination of at least two of benzophenone (BP), 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), and ethyl 2,4,6-trimethylbenzoylphosphonate (TPO).

[0083] In a specific embodiment, the photovoltaic isolation protective glue also includes a thermal initiator, thereby forming a photothermal dual-curing system. The thermal initiator is used for deep curing, which can further increase the cross-linking density, so that the formed protective film has better high temperature resistance and acid and alkali resistance, and enhances the stability of the protective film.

[0084] In a specific embodiment, the mass parts of the thermal initiator in the photovoltaic isolation protective glue are 0-10 parts, for example, it can be 0.1 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0085] In a specific embodiment, the photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass, preferably 0.1-5 parts by mass, of a thermal initiator.

[0086] In a specific embodiment, the thermal initiator includes an azo initiator and / or an organic peroxide, preferably any one or a combination of at least two of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), di-tert-butyl peroxide (DTBP), and dicumyl peroxide (DCP).

[0087] In a specific embodiment, the photovoltaic isolation and protection adhesive further includes an auxiliary agent for adjusting the performance of the isolation and protection adhesive.

[0088] In a specific embodiment, the mass parts of the auxiliary agent in the photovoltaic isolation protective glue are 0-10 parts, for example, it can be 0.1 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0089] In a specific embodiment, the photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass, preferably 0.1-5 parts by mass of an auxiliary agent.

[0090] In a specific embodiment, the auxiliary agent includes any one of a surfactant and an antioxidant, or a combination of at least two of them.

[0091] In a specific embodiment, the mass parts of the surfactant and antioxidant in the photovoltaic isolation protective glue are independently 0-3 parts, for example, it can be 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 0-2.5 parts.

[0092] The surfactant can adjust the surface tension of the photovoltaic isolation protective adhesive. In a specific embodiment, the surfactant includes any one of polyether-modified polysiloxane and fluorine-containing surfactant, or a combination of at least two thereof.

[0093] The antioxidant can improve the storage stability of the photovoltaic isolation protective adhesive. In a specific embodiment, the antioxidant includes any one of a hindered phenol antioxidant, a hindered amine antioxidant, and a phosphite antioxidant, or a combination of at least two thereof.

[0094] In a specific embodiment, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0095]

[0096] Among them, the mass parts of the acrylic ester monomer are 30-70 parts, for example, it can be 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts or 68 parts, as well as specific point values between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0097] Optionally, the acrylate monomer includes any one of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, isobornyl acrylate, methoxypolyethylene glycol acrylate, and a combination of at least two of them, preferably any one of methyl methacrylate (MMA), butyl acrylate (BA), isobornyl acrylate (IBOA), and methoxypolyethylene glycol methacrylate (MPEG acrylate), and the combination thereof exemplarily includes but is not limited to: a combination of isobornyl acrylate and methoxypolyethylene glycol methacrylate, a combination of isobornyl acrylate and butyl acrylate, a combination of isobornyl acrylate and methyl methacrylate, a combination of isobornyl acrylate and butyl acrylate, a combination of butyl acrylate and methoxypolyethylene glycol methacrylate, and a combination of methyl methacrylate and methoxypolyethylene glycol methacrylate.

[0098] The mass parts of the prepolymer are 8-40 parts, for example, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0099] Optionally, the prepolymer includes any one or a combination of at least two of polyurethane (meth)acrylate, epoxy (meth)acrylate prepolymer, polyester (meth)acrylate, and polyether (meth)acrylate, preferably polyester (meth)acrylate.

[0100] The mass fraction of the photoinitiator is 0.5-5 parts, for example, it can be 0.8 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0101] The mass fraction of the thermal initiator is 0-5 parts, for example, it can be 0.1 parts, 0.5 parts, 0.8 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0102] In the aforementioned specific embodiment, the photovoltaic isolation protective glue uses acrylic ester monomers, combined with prepolymers, photoinitiators, and optional thermal initiators. Its cost is relatively low, and the protective glue formed by curing is acid and alkali resistant and stable, suitable for large-scale production, and can meet the high-precision coating requirements of inkjet printing.

[0103] In another specific embodiment, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0104]

[0105]

[0106] The functional monomer is an unsaturated bond-containing siloxane monomer and / or a fluorine-containing acrylate monomer.

[0107] Among them, the mass parts of the acrylic ester monomer are 10-30 parts, for example, it can be 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts or 28 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0108] Optionally, the acrylic acid ester monomer includes any one or a combination of at least two of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, isobornyl acrylate, methoxy polyethylene glycol acrylate, and methoxy polyethylene glycol methacrylate, preferably methyl methacrylate (MMA), butyl acrylate (BA), isobornyl acrylate (IBOA), and methoxy polyethylene glycol acrylate (MPEG acrylate).

[0109] The mass parts of the functional monomer are 5-40 parts, for example, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, as well as specific point values between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0110] The functional monomer is an unsaturated bond-containing siloxane monomer and / or a fluorine-containing acrylate monomer; optionally, the unsaturated bond-containing siloxane monomer includes any one of methacryloxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, methacryloxypropyltriethoxysilane, acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, or a combination of at least two thereof, preferably methacryloxypropyltrimethoxysilane (MEMO). Alternatively, the fluorine-containing acrylate monomer includes any one of perfluoroalkyl acrylate, heptafluorobutyl acrylate, heptafluorobutyl methacrylate, trifluoroethyl acrylate, and trifluoroethyl methacrylate, or a combination of at least two thereof.

[0111] The mass parts of the prepolymer are 10-40 parts, for example, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0112] Optionally, the prepolymer includes any one or a combination of at least two of polyurethane (meth)acrylate, epoxy (meth)acrylate prepolymer, polyester (meth)acrylate, and silane-modified prepolymer, preferably polyurethane (meth)acrylate and / or silane-modified prepolymer.

[0113] The mass fraction of the photoinitiator is 0.5-5 parts, for example, it can be 0.8 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0114] The mass fraction of the thermal initiator is 0.1-5 parts, for example, it can be 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0115] In the aforementioned specific embodiment, the photovoltaic isolation protective glue adopts a compound of acrylate monomers, functional monomers (containing unsaturated bond siloxane monomers and / or fluorine-containing acrylate monomers) and prepolymers, and is cured by a photothermal dual-curing system. The resulting protective film has excellent high temperature resistance, acid and alkali resistance, and chemical resistance, and has better overall performance, making it suitable for mid-end applications. The viscosity and surface tension of the isolation protective glue can fully meet the high-precision coating requirements of inkjet printing.

[0116] In another specific embodiment, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0117]

[0118]

[0119] Among them, the mass parts of the fluorinated acrylate monomer are 15-35 parts, for example, it can be 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts or 34 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0120] Optionally, the fluorine-containing acrylate monomer includes any one of perfluoroalkyl acrylate, heptafluorobutyl acrylate, heptafluorobutyl methacrylate, trifluoroethyl acrylate, and trifluoroethyl methacrylate, or a combination of at least two thereof.

[0121] The mass fraction of the unsaturated bond-containing siloxane monomer is 10-30 parts, for example, it can be 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts or 28 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0122] Optionally, the unsaturated bond-containing siloxane monomer includes any one of methacryloxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, methacryloxypropyltriethoxysilane, acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, or a combination of at least two thereof, preferably methacryloxypropyltrimethoxysilane (MEMO).

[0123] The mass parts of the prepolymer are 10-40 parts, for example, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0124] Optionally, the prepolymer includes any one or a combination of at least two of polyurethane (meth)acrylate, epoxy (meth)acrylate prepolymer, polyester (meth)acrylate, and silane-modified prepolymer, preferably polyurethane (meth)acrylate and / or silane-modified prepolymer.

[0125] The mass fraction of the photoinitiator is 0.5-5 parts, for example, it can be 0.8 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0126] The mass fraction of the thermal initiator is 0.1-5 parts, for example, it can be 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0127] In the aforementioned specific embodiment, the photovoltaic isolation protective glue adopts a compound of unsaturated bond-containing siloxane monomers, fluorinated acrylate monomers and prepolymers, and is cured by a photothermal dual curing system, so that the obtained protective film has more excellent high temperature resistance, acid and alkali resistance and chemical resistance, and can provide stable and effective protection for solar cells in harsh environments such as electroplating processes. The viscosity and surface tension of the isolation protective glue can fully meet the high-precision coating requirements of inkjet printing, and is suitable for high-end photovoltaic cells.

[0128] In a specific embodiment, the viscosity of the photovoltaic isolation protective glue is 3-50cps, for example, it can be 5cps, 8cps, 10cps, 12cps, 15cps, 18cps, 20cps, 22cps, 25cps, 28cps, 30cps, 32cps, 35cps, 38cps, 40cps, 42cps, 45cps or 48cps, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 5-40cps.

[0129] Illustratively, the viscosity of the photovoltaic isolation protective adhesive is tested at 25±1°C.

[0130] In a specific embodiment, the surface tension of the photovoltaic isolation protective glue is 15-50mN / m, for example, it can be 18mN / m, 20mN / m, 22mN / m, 25mN / m, 28mN / m, 30mN / m, 30mN / m, 35mN / m, 38mN / m, 40mN / m, 42mN / m, 45mN / m or 48mN / m, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 20-45mN / m.

[0131] One embodiment of the present invention provides a use of the photovoltaic isolation protective adhesive provided in the aforementioned embodiment in a photovoltaic cell.

[0132] One embodiment of the present invention provides a photovoltaic cell, comprising a cell and an isolation protective film disposed on the surface of the cell, wherein the isolation protective film is prepared by the photovoltaic isolation protective adhesive provided by the aforementioned embodiment.

[0133] In a specific embodiment, the photovoltaic cell is a back-contact cell, and the isolation protective film is disposed on the front side of the cell.

[0134] In a specific embodiment, the thickness of the isolation protective film is 1-40 μm, for example, it can be 2 μm, 5 μm, 10 μm, 12 μm, 15 μm, 20 μm, 22 μm, 25 μm, 30 μm, 32 μm or 35 μm, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 5-25 μm.

[0135] One embodiment of the present invention provides a method for preparing a photovoltaic cell, the method comprising: applying the photovoltaic isolation protective adhesive as described in the above embodiment to the surface of a cell, and UV curing to obtain the photovoltaic cell.

[0136] In a specific embodiment, the preparation method of the photovoltaic isolation protective adhesive includes: uniformly mixing an unsaturated bond-containing monomer, a prepolymer, a photoinitiator, an optional thermal initiator, and an optional auxiliary agent to obtain the photovoltaic isolation protective adhesive.

[0137] In one embodiment, the coating method comprises inkjet printing.

[0138] In the present invention, the inkjet printing achieves high-precision coating and can embed a QR code, supporting single-piece coding traceability and improving quality control and data management capabilities during the production process.

[0139] In a specific embodiment, before the inkjet printing, the step of filtering and removing impurities from the photovoltaic isolation protective glue is also included.

[0140] In a specific embodiment, the wavelength of the UV curing is 360-370 nm, for example, it can be 361 nm, 362 nm, 363 nm, 364 nm, 365 nm, 366 nm, 367 nm, 368 nm or 369 nm, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 365 nm.

[0141] In one embodiment, the UV curing energy is 500-15000 mJ / cm 2 , for example, 600 mJ / cm 2 , 800mJ / cm 2 、1000mJ / cm 2 , 2000mJ / cm 2 、3000mJ / cm 2 , 5000mJ / cm 2 , 7000mJ / cm 2 , 8000mJ / cm 2 、10000mJ / cm 2 、12000mJ / cm 2 or 14000mJ / cm 2 , and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 500-12000mJ / cm 2 .

[0142] In a specific embodiment, the UV curing time is 0.1-10s, for example, it can be 0.2s, 0.5s, 0.8s, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s or 9s, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range, preferably 0.2-5s.

[0143] In a specific embodiment, the UV curing further includes a thermal curing step.

[0144] In the present invention, the photovoltaic isolation protective glue includes a photoinitiator, which can use UV light to quickly form a preliminary cross-linking network during the curing process, ensuring the pattern accuracy and stability after inkjet printing; at the same time, the isolation protective glue also includes an optional thermal initiator, which can perform deep curing during the thermal curing process, increase the cross-linking density, and further enhance high temperature resistance and acid and alkali resistance; the photothermal dual-curing system combines the rapid prototyping of photocuring and the chemical stability of thermal curing, ensuring that the obtained isolation protective film can stably protect the velvet surface of the battery cell for a long time during the electroplating metallization process.

[0145] In a specific embodiment, the thermal curing temperature is 80-280°C, for example, it can be 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 160°C, 180°C, 220°C, 250°C or 270°C, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0146] In one specific embodiment, the thermal curing time is 10-60 min, for example, it can be 15 min, 20 min, 20 min, 30 min, 35 min, 40 min, 45 min, 50 min or 55 min, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0147] The photovoltaic isolation protective adhesive and its application, and photovoltaic cells of the present invention are described in detail below using multiple embodiments as examples. However, the photovoltaic isolation protective adhesive and its application, and photovoltaic cells of the present invention are not limited to these embodiments.

[0148] In the following examples of the present invention, the materials for which no preparation methods are provided are all commercially available chemicals. The specific information of some of the materials is shown in the following table:

[0149]

[0150]

[0151] Example 1

[0152] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0153]

[0154] A photovoltaic cell includes a cell and an isolation protective film provided on the surface of the cell. The isolation protective film is prepared using the photovoltaic isolation protective adhesive provided in this embodiment. The specific method is as follows:

[0155] (1) Mix the components of the photovoltaic isolation protective adhesive except the photoinitiator and the thermal initiator according to the aforementioned formula and stir them evenly; then add the photoinitiator and the thermal initiator under light-proof conditions, stir them in the dark until they are completely mixed, and obtain the photovoltaic isolation protective adhesive;

[0156] (2) After filtering and removing impurities from the photovoltaic isolation protective glue obtained in step (1), it is coated on the surface of the solar cell by an inkjet printer and UV cured with a wavelength of 365nm and an energy of 7000mJ / cm 2 , UV curing time is 0.6s; and then thermally cured at 220°C for 18min to form an isolation protective film with a thickness of 8μm to obtain the photovoltaic cell.

[0157] Example 2

[0158] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0159]

[0160] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this embodiment, and its preparation method is the same as that in Example 1.

[0161] Example 3

[0162] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0163]

[0164] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this embodiment, and its preparation method is the same as that in Example 1.

[0165] Example 4

[0166] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0167]

[0168] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this embodiment, and its preparation method is the same as that in Example 1.

[0169] Example 5

[0170] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0171]

[0172] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this embodiment, and its preparation method is the same as that in Example 1.

[0173] Comparative Example 1

[0174] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0175] 94 parts of monomer IBOA

[0176] Photoinitiator TPO 4 parts

[0177] Photoinitiator BP 2 parts.

[0178] A photovoltaic cell comprises a cell and an isolation protective film provided on the surface of the cell, wherein the isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this comparative example, and the specific method is as follows:

[0179] (1) Mix the components according to the above formula, stir in the dark until they are completely mixed, and obtain a photovoltaic isolation protective adhesive;

[0180] (2) After filtering and removing impurities from the photovoltaic isolation protective glue obtained in step (1), it is coated on the surface of the solar cell by an inkjet printer and UV cured with a wavelength of 365nm and an energy of 7000mJ / cm 2 , the UV curing time is 0.6s, and an isolation protective film with a thickness of 8 μm is formed to obtain the photovoltaic cell.

[0181] Comparative Example 2

[0182] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0183]

[0184] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this comparative example, and its preparation method is the same as that of comparative example 1.

[0185] Comparative Example 3

[0186] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0187] 70 parts of bisphenol A epoxy resin (general type)

[0188] 24 parts of monomer BA

[0189] Photoinitiator BP 6 parts.

[0190] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this comparative example, and its preparation method is the same as that of comparative example 1.

[0191] Comparative Example 4

[0192] A photovoltaic isolation protective adhesive comprises the following components in parts by mass:

[0193] 65 parts of vinyl-terminated polydimethylsiloxane

[0194] 29 parts of monomer MMA

[0195] Photoinitiator TPO 6 parts.

[0196] A photovoltaic cell comprises a cell and an isolation protective film arranged on the surface of the cell. The isolation protective film is prepared by the photovoltaic isolation protective adhesive provided in this comparative example, and its preparation method is the same as that of comparative example 1.

[0197] The following performance tests were conducted on the photovoltaic isolation protective adhesive and photovoltaic cells provided in the aforementioned embodiments and comparative examples:

[0198] (1) Viscosity: Brookfield DV-II+ viscometer (model DV2TLV) was used at a speed of 100 rpm and a shear rate of 10 s -1 , at 25 ° C, test the viscosity of photovoltaic isolation protective adhesive according to the method in standard ASTM D2196;

[0199] (2) Surface tension: The surface tension of the photovoltaic isolation protective adhesive was measured by the Wilhelmy method using a KSV NIMA tensiometer according to the method in standard ISO 6295;

[0200] (3) Light transmittance: The light transmittance of the isolation protective film was measured using a BYK-GARDNER Haze-gard i haze transmittance meter according to ASTM D1003 Procedure A, with a thickness of 40 μm as the reference;

[0201] (4) Acid and alkali resistance: According to the method in ISO 175:2010, the isolation protective film samples were immersed in solutions with a pH value of 1 and a pH value of 14 for 30 minutes each, and the mass loss rate after immersion was measured;

[0202] (5) High temperature resistance: The isolation protective film sample was placed in an air furnace at 250°C for 1 hour, and the mass loss rate after insulation was measured. The appearance change after insulation was measured using a colorimeter to obtain the △b* value;

[0203] The test results are shown in Table 1:

[0204] Table 1

[0205]

[0206] According to the test results in Table 1, the photovoltaic isolation protective adhesive provided by the present invention has a viscosity of 23-35 cps at 25°C and a surface tension of 35-45 mN / m. The low viscosity and suitable surface tension make it highly compatible with the high-precision coating process of inkjet printing. While accurately coating, a QR code can be embedded, supporting single-piece coding and traceability, thereby achieving management and control of production efficiency and quality.

[0207] The present invention, through the design and compounding of components, ensures that the protective film formed by curing the photovoltaic isolation protective glue has a high cross-linking density, a mass loss rate of less than 2% in an environment with a pH value of 1-14, can remain stable and hardly degrades, and has a temperature resistance of ≥250°C. The mass loss rate after high-temperature treatment at 250°C for 1 hour is less than 2%, and the color difference is low (△b*≤2.31). It has excellent high-temperature resistance and acid and alkali resistance, good durability, and can provide long-lasting, stable and effective protection for the battery cells of back-contact solar cells in harsh environments such as electroplating processes, protecting the velvet surface of the battery cells from damage during the electroplating process; at the same time, the light transmittance of the protective film is greater than 99.95%, and does not affect the photoelectric conversion efficiency of the photovoltaic cell.

[0208] The photovoltaic isolation and protective adhesive in Comparative Example 1 lacks a prepolymer. Although it has a low viscosity, it lacks acid and alkali resistance and high temperature resistance, and its durability is poor. Comparative Example 2 uses an acrylic monomer-based adhesive, which has a low viscosity but poor acid and alkali resistance and weak chemical resistance. Comparative Example 3 uses a conventional epoxy resin-based solar cell adhesive, which has a high viscosity and is not suitable for inkjet printing, and the resulting protective film has poor durability. Comparative Example 4 uses a silicone-based adhesive, which has a moderate viscosity but poor acid and alkali resistance and high temperature resistance, and cannot meet the durability requirements of the protective film.

[0209] The applicant declares that while the above-described embodiments illustrate the photovoltaic isolation and protective adhesive and its applications, the present invention is not limited to these embodiments, nor does it necessarily rely on them for implementation. Persons skilled in the art should understand that any improvements to the present invention, equivalent replacements for raw materials in the present invention, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A photovoltaic isolation protective adhesive, characterized in that: The photovoltaic isolation protective adhesive comprises the following components in parts by mass: 5-70 parts of unsaturated bond monomer 5-60 parts of prepolymer Photoinitiator 0.1-10 parts.

2. The photovoltaic isolation protective adhesive according to claim 1, characterized in that: The unsaturated bond-containing monomer includes any one of an acrylate monomer, a fluorine-containing acrylate monomer, and an unsaturated bond-containing siloxane monomer, or a combination of at least two thereof; Preferably, the acrylic acid ester monomer includes any one or a combination of at least two of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isobornyl (meth)acrylate, and methoxy polyethylene glycol (meth)acrylate; Preferably, the fluorine-containing acrylate monomer includes any one or a combination of at least two of perfluoroalkyl acrylate, heptafluorobutyl (meth)acrylate, and trifluoroethyl (meth)acrylate; Preferably, the unsaturated bond-containing siloxane monomer includes any one of (meth)acryloxypropyltrimethoxysilane, (meth)acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, or a combination of at least two thereof.

3. The photovoltaic isolation protective adhesive according to claim 1, characterized in that: The prepolymer includes any one or a combination of at least two of polyurethane (meth) acrylate, epoxy (meth) acrylate prepolymer, polyester (meth) acrylate, polyether (meth) acrylate, and silane-modified prepolymer; Preferably, the number average molecular weight of the prepolymer is 3000-12000 g / mol.

4. The photovoltaic isolation protective adhesive according to claim 1, characterized in that: The photoinitiator includes any one or a combination of at least two of benzophenone photoinitiators, benzophenone photoinitiators, benzoin ether photoinitiators, and acylphosphine oxide photoinitiators, preferably any one or a combination of at least two of benzophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and ethyl 2,4,6-trimethylbenzoylphosphonate; Preferably, the photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass of a thermal initiator; Preferably, the thermal initiator includes an azo initiator and / or an organic peroxide compound, more preferably any one of benzoyl peroxide, azobisisobutyronitrile, di-tert-butyl peroxide, and dicumyl peroxide, or a combination of at least two thereof.

5. The photovoltaic isolation protective adhesive according to claim 1, characterized in that: The photovoltaic isolation protective adhesive further comprises 0.1-10 parts by mass of an auxiliary agent; Preferably, the auxiliary agent includes any one of a surfactant and an antioxidant, or a combination of at least two of them.

6. The photovoltaic isolation protective adhesive according to claim 1, characterized in that: The photovoltaic isolation protective adhesive comprises the following components in parts by mass: Alternatively, the photovoltaic isolation protective adhesive comprises the following components in parts by mass: The functional monomer is an unsaturated bond-containing siloxane monomer and / or a fluorine-containing acrylate monomer; Alternatively, the photovoltaic isolation protective adhesive comprises the following components in parts by mass:

7. The photovoltaic isolation protective adhesive according to any one of claims 1 to 6, characterized in that: The viscosity of the photovoltaic isolation protective adhesive is 3-50 cps; Preferably, the surface tension of the photovoltaic isolation protective adhesive is 15-50 mN / m, more preferably 20-45 mN / m.

8. A photovoltaic cell, characterized in that: The photovoltaic cell includes a cell and an isolation protective film provided on the surface of the cell, wherein the isolation protective film is prepared by the photovoltaic isolation protective adhesive according to any one of claims 1 to 7; Preferably, the photovoltaic cell is a back-contact cell, and the isolation protective film is provided on the front side of the cell; Preferably, the thickness of the isolation protection film is 1-40 μm.

9. A method for preparing a photovoltaic cell according to claim 8, characterized in that: The preparation method comprises: applying the photovoltaic isolation protective adhesive according to any one of claims 1 to 7 to the surface of a cell, and UV curing to obtain the photovoltaic cell.

10. The preparation method according to claim 9, characterized in that The coating method includes inkjet printing; Preferably, the energy of the UV curing is 500-15000 mJ / cm 2 , further preferably 500-12000mJ / cm 2 ; Preferably, the UV curing further includes a thermal curing step; Preferably, the thermal curing temperature is 80-280° C. and the time is 10-60 minutes.

Images