CN112552813A - Weather-resistant fluorine coating, photovoltaic adhesive film and preparation method thereof - Google Patents
Weather-resistant fluorine coating, photovoltaic adhesive film and preparation method thereof Download PDFInfo
- Publication number
- CN112552813A CN112552813A CN202011447435.2A CN202011447435A CN112552813A CN 112552813 A CN112552813 A CN 112552813A CN 202011447435 A CN202011447435 A CN 202011447435A CN 112552813 A CN112552813 A CN 112552813A
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- coating
- adhesive film
- parts
- electron beam
- weather
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- 239000011248 coating agent Substances 0.000 title claims abstract description 143
- 239000002313 adhesive film Substances 0.000 title claims abstract description 88
- 239000011737 fluorine Substances 0.000 title claims abstract description 84
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 84
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
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- QUKRIOLKOHUUBM-UHFFFAOYSA-N 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl prop-2-enoate Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCOC(=O)C=C QUKRIOLKOHUUBM-UHFFFAOYSA-N 0.000 claims description 2
- FQMIAEWUVYWVNB-UHFFFAOYSA-N 3-prop-2-enoyloxybutyl prop-2-enoate Chemical compound C=CC(=O)OC(C)CCOC(=O)C=C FQMIAEWUVYWVNB-UHFFFAOYSA-N 0.000 claims description 2
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- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 claims description 2
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention belongs to the technical field of liquid fluorine coatings for photovoltaic packaging adhesive films, and particularly relates to an electron beam-cured weather-resistant fluorine coating, a photovoltaic packaging adhesive film and a preparation method thereof. The weather-resistant fluorine coating comprises the following raw materials in parts by weight: main resin: 40-65 parts; pigment and filler: 20-50 parts; active diluent: 10-20 parts; conventional auxiliary agents: 2-6 parts; rheological aid: 1-4 parts; down-conversion of nanopowder: 0.5-3 parts. The coating has the advantages that the fluororesin and the ultraviolet conversion material are used, so that the weather resistance and durability of the coating can be effectively guaranteed; meanwhile, the rheological property and the crosslinking property of the weather-resistant coating are improved, so that the coating is fully soaked on the surface of the adhesive film and forms effective chemical bond bonding through curtain-shaped electron beam radiation, and the coating is suitable for printing grid areas of photovoltaic packaging adhesive films. The weather-resistant fluorine coating formed by electron beam crosslinking curing and corona treatment has the advantages of uniform thickness, good adhesive force, excellent aging performance and the like, and the coating and the adhesive film matrix are not easy to delaminate.
Description
Technical Field
The invention belongs to the technical field of liquid fluorine coatings for photovoltaic packaging adhesive films, and particularly relates to an electron beam-cured weather-resistant fluorine coating, a photovoltaic adhesive film and a preparation method thereof.
Background
In order to meet the requirements of assembly factories on assembly efficiency and appearance, different colors can be printed in the grid area of the adhesive film. The grid area of the transparent adhesive film is printed with the white coating, so that the power generation efficiency of the double-sided battery assembly can be improved; the grid area of the transparent adhesive film is printed with black, blue and other colors, and the transparent adhesive film can also be applied to photovoltaic building integrated design; the adhesive film coated with the specific coating in the grid area is called a grid adhesive film, and the application form can meet the requirements of customers on the power generation efficiency and appearance of the component. The grid area of the adhesive film is mainly the area outside the area covered by the battery piece on the adhesive film, namely the area corresponding to the gaps between the battery piece and between the battery piece and the frame on the adhesive film, and the printing positions and sizes of the battery pieces are different according to the arrangement of the battery pieces. At the same time, the printed area needs to extend 1-3mm towards the cell footprint for the feasibility of a customer vacuum lamination operation.
However, in the above-mentioned printing of the coating on the photovoltaic adhesive film, the process of the coating converting from the liquid state to the solid state involves a chemical reaction, and external energy needs to be provided so that the coating is sufficiently cross-linked and cured, and the implementation manner thereof mainly includes several manners: oven heating, UV irradiation, microwave curing, electron beam curing; a large amount of heat can be generated by both oven heating and microwave curing, so that the adhesive film can be deformed by heating, and the method is not suitable for use; the UV irradiation has requirements on the transparency of the coating, when the coating is non-transparent, the UV energy can only enable the surface of the coating to generate crosslinking curing, and the UV rays do not have penetrability on pigments and fillers, and show that the coating is dry outside and wet inside, and the application effect is not good. The electron beam curing adopted in the invention has strong penetrability to pigments and fillers in the material, the coating can be thick, the heat effect is low, the matrix glue film is not easy to deform, and an initiator is not needed in the coating; the low-energy electron accelerator is adopted to emit curtain-shaped electron beams, the coating can realize the conversion from liquid to solid through the curtain-shaped electron beams, the curing time is only 0.1 second, and the production efficiency is high.
The outdoor service life of the coating prepared from the common non-fluororesin is generally 3-10 years, and the coating is easy to lose gloss, chalk and crack. Compared with common resin materials, the fluororesin is more stable than chemical bonds such as C-H, C-Cl and the like due to the C-F structure of the fluororesin, so that the fluororesin occupies an irreplaceable position in the aspect of natural weather resistance. The fluorine material is introduced into the photovoltaic module material, and plays a vital role in the quality guarantee of the module for 25 years and even 30 years.
The down-conversion nano material is a rare earth modified material which converts one high-energy ultraviolet photon into a plurality of low-energy visible photons. The down-conversion material is applied to the coating of the grid adhesive film, so that the ultraviolet light erosion of the coating can be reduced, the ultraviolet light can be converted into visible light, and the reflectivity and the component power are improved. The photoelectric response of the crystalline silicon cell to light in an ultraviolet light region is low, the photoelectric response to a visible light region is high, and the introduction of the down-conversion material is one of the benefits.
Disclosure of Invention
The invention provides an electron beam cured weather-resistant fluorine coating, a photovoltaic adhesive film and a preparation method thereof.
In order to solve the technical problems, the invention provides an electron beam cured weather-resistant fluorine coating which comprises the following raw materials in parts by weight: main resin: 40-65 parts; pigment and filler: 20-50 parts; active diluent: 10-20 parts; conventional auxiliary agents: 2-6 parts; rheological aid: 1-4 parts of down-conversion nano powder: 0.5-3 parts. The preparation method of the electron beam cured weather-resistant fluorine coating comprises the following steps: concentrating slurry, proportioning and grinding; secondary compounding and addition of rheological additive.
In a second aspect, the present invention provides a weatherable fluorine coating formed using an electron beam cured weatherable fluorine coating.
In a third aspect, the present invention provides a photovoltaic adhesive film, comprising: the coating comprises a film substrate, a printing grid area arranged on the film substrate, and the weather-resistant fluorine coating which covers the printing grid area and is as described above.
In a fourth aspect, the present invention provides a method for preparing a photovoltaic adhesive film, including: preparing electron beam cured weather resistant fluorine paint; coating weather-resistant fluorine paint on a printing grid area on a glue film substrate; electron beam crosslinking and curing; and (4) performing corona treatment.
The invention has the beneficial effects that the electron beam cured weather-resistant fluorine coating, the weather-resistant fluorine coating and the photovoltaic adhesive film are prepared by taking main resin, pigment and filler, active diluent, conventional auxiliary agent, rheological auxiliary agent and down-conversion nano powder as raw materials; the fluorine material is used in the formula, so that the weather resistance is better; meanwhile, the rheological property and the crosslinking property of the coating are improved, so that the coating is fully soaked on the surface of the adhesive film and forms effective chemical bond bonding through EB radiation, and the coating is suitable for coating a printing grid area of a photovoltaic adhesive film; the weather-resistant fluorine coating is formed after electron beam crosslinking and curing, is not easy to peel off and delaminate from the packaging adhesive film, and has the advantages of uniform coating thickness, good adhesive force, excellent aging performance and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a process for preparing a photovoltaic grid adhesive film according to the present invention;
FIG. 2 is a schematic view of the position of a printed grid area of the present invention on a photovoltaic adhesive film;
FIG. 3 is a diagram showing the curing and crosslinking mechanism of the electron beam cured weatherable fluorine coating of the present invention;
in fig. 2: printing grid area 1 and battery piece area 2.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first part:
in order to realize the improvement of the generating efficiency and the appearance effect of the assembly, the existing photovoltaic adhesive film is mainly realized by adding color master batches containing titanium pigment and other color fillers on the basis of the existing transparent adhesive film; due to the design limitation of a die head outflow channel of an adhesive film casting production line and the complexity of a grid area, the pigment and filler filling at fixed positions in the grid area is difficult to realize under the casting process, so that the conventional white adhesive film cannot be applied to a battery assembly for double-sided power generation; and the electron beam cured weather-resistant fluorine coating can realize the fixed-point printing of the grid area, thereby realizing the power overflow and appearance effect of the component.
The grid adhesive film is coated with the fluorine coating in a specific grid area, so that a conventional online roller coating mode is not suitable, the fluorine coating in the grid area needs to be uniform in thickness and clear in boundary, the screen printing or gravure printing mode is more economical and effective, and the rheological property of the coating is an important step, so that the coating is required to have static high viscosity and lower viscosity under medium and low shear force, and the coating has good over-screening property and off-plate property, namely the coating has excellent thixotropy.
The traditional thermosetting type, thermoplastic type, UV and microwave curing coating relates to the problems of heating temperature, incapability of crosslinking with a glue film, no penetration of UV rays and the like; and the non-fluorine coating is also far less weather resistant than the fluorine coating; the adhesive film is at a low degree of crosslinking before packaging, and is deformed and self-crosslinked when heated, so that the adhesive film is not suitable for use. Therefore, the invention provides an electron beam cured weather-resistant fluorine coating which comprises the following raw materials in parts by weight: main resin: 40-65 parts; pigment and filler: 20-50 parts; active diluent: 10-20 parts; conventional auxiliary agents: 2-6 parts; 1-4 parts of a rheological additive; down-conversion of nanopowder: 0.5-3 parts.
Optionally, the weather-resistant fluorine coating comprises the following raw materials in parts by weight: main resin: 55 parts of (1); pigment and filler: 43 parts of a mixture; active diluent: 14 parts of (1); conventional auxiliary agents: 3 parts of a mixture; 4 parts of rheological additive, down-conversion nano powder: 2.6 parts.
Optionally, the weather-resistant coating comprises the following raw materials in parts by weight: main resin: 42 parts of (A); pigment and filler: 50 parts of a mixture; active diluent: 18 parts of a mixture; conventional auxiliary agents: 5 parts of a mixture; 2 parts of a rheological additive; down-conversion of nanopowder: 1.4 parts.
Optionally, the host resin includes, but is not limited to: fluorine modified epoxy acrylate prepolymer, fluorine modified polyester acrylate prepolymer, fluorine modified polyurethane acrylate prepolymer, hexafluorobutyl acrylate, hexafluoroisopropyl methacrylate, hexafluorobutyl methacrylate, perfluoroalkyl ethyl methacrylate, perfluoro octyl ethyl acrylate, perfluoroalkyl ethyl alcohol. The main resin is a main film forming matter of the coating, is a continuous phase in the coating and plays a main role in the performance of the coating; the main resin contains C ═ C bonds in the structure, and free radicals are generated under the action of electron beams, so that chain growth and chain termination are caused, and the coating is crosslinked and cured in a network manner to form a compact coating. Because the glue film also has C ═ C double bonds, under the action of electron beams, the C ═ C double bonds in the main resin and the C ═ C double bonds on the surface of the glue film are also crosslinked and cured, so that the fluorine coating and the glue film have good adhesive force and the glue film and the coating have good interlayer peeling strength during lamination.
Optionally, the pigments and fillers include, but are not limited to: lithopone, antimony white powder, titanium dioxide, calcium carbonate, barium sulfate, carbon black, graphene, copper chromium black, iron chromium black, phthalocyanine blue, cobalt blue, iron oxide red, cadmium yellow, zinc iron yellow, cobalt green and cobalt chromium green. The pigment and filler mainly has the functions of covering, coloring, filling and the like. The pigment can endow corresponding color appearance in the grid area and improve the reflectivity; part of the filler in the coating can reduce the material cost and improve some special properties, such as scratch resistance, heat resistance, anti-blocking property and the like.
Optionally, the reactive diluents include, but are not limited to: trimethylolpropane triacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate, isobornyl acrylate, 2-ethylhexyl acrylate, beta-hydroxyethyl acrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate, monoethylene glycol diacrylate, 1, 3-butanediol diacrylate, 1, 4-butanediol diacrylate, triethylene glycol divinyl ether, 4-hydroxybutyl vinyl ether, in combination with one or more other additives. The reactive diluent can improve the viscosity and the solubility of the coating, realize the coating property and help the transfer of a film-forming substance/pigment/filler/auxiliary agent to the surface of an object to be coated; meanwhile, the reactive diluent has C ═ C double bonds, and can participate in the crosslinking reaction of the C ═ C double bonds on the surfaces of the main resin and the adhesive film under the action of electron beams, so that the solvent volatilization is not generated.
Optionally, the conventional auxiliary agents include, but are not limited to, one or more combinations of dispersing agents, wetting agents, antifoaming agents, leveling agents, and tackifying resins. The dispersing agent, including but not limited to at least one of triethylhexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, guar gum, and fatty acid polyglycol ester, is added to the stirred material before grinding to help crush the pigment and filler particles during grinding and prevent the crushed particles from agglomerating to keep the dispersion stable. Wetting agents include, but are not limited to, at least one of alkyl sulfates, sulfonates, fatty acid or fatty acid ester sulfates, carboxylic acid soaps, phosphate esters, polyoxyethylene alkylphenol ethers, polyoxyethylene fatty alcohol ethers, and polyoxyethylene polyoxypropylene block copolymers, which make the pigment fillers more wettable by diluents, by lowering their surface tension or interfacial tension, which allows the diluents to spread on or penetrate the surface of the solid materials, thereby wetting the solid materials of the pigment fillers. The defoaming agent comprises but is not limited to at least one of silicone defoaming agent and polyether defoaming agent; the defoaming agent can reduce the surface tension of the coating, prevent the coating from generating bubbles during stirring, and finally cause the coating in a grid area to generate appearance defects such as broken bubbles on the surface of a paint film in the printing process. The leveling agent comprises at least one of but not limited to an acrylic leveling agent, an organic silicon leveling agent and a fluorine modified acrylate leveling agent; the leveling agent can influence the surface tension of a paint film, promote the paint to form a flat and uniform coating in the drying process, improve the permeability of the paint to a substrate, and reduce appearance defects such as spots, traces and the like generated in the process of painting; conventional auxiliaries with reactive double bonds can participate in the electron beam curing reaction without migration. The tackifying resin comprises at least one of but not limited to hydrogenated rosin resin, hydrogenated terpene resin and polyester modified rosin tackifying resin; the tackifying resin can increase the bonding force between the coating of the grid area and EVA, and meet the performance requirement of a customer after vacuum hot pressing after the assembly is laminated.
Optionally, the rheological aid includes, but is not limited to, one or more combinations of thickeners or thixotropic agents. The thickener includes, but is not limited to, at least one of inorganic thickeners, cellulose-based thickeners, polyacrylic acid-based thickeners, polyurethane-based thickeners, natural gum thickeners, and polyoxyethylene-based thickeners. The thickening agent can improve the viscosity of the paint, so that each component in the paint keeps a uniform and stable suspension state without precipitation or slowing down the precipitation and precipitation of materials. Thixotropic agents include, but are not limited to, at least one of organobentonite, fumed silica, polyamide wax, hydrogenated castor oil. The thixotropic agent can improve the rheological property of the coating, and when the coating is subjected to shearing force during printing, the coating becomes thin and passes through a screen printing plate and is printed on a substrate; when the shearing force is removed, the viscosity of the coating becomes high, and the coating on the screen does not overflow.
Optionally, the down-conversion nano powder is rare earth metal doped modified nano powder. Down-converting nanopowders including but not limited to K2GdF5:Tb3+、KLiGdF5:Tb3+、BaGdB9O16:xEu3+、SrAl2O4:Eu2+,Dy3+、NaGd(WO4)2:Eu3+、NaYF4:Tb3+,Yb3+、YAG:Ce3+、YVO4：Eu3+At least one of (1). The down-conversion nano powder can convert ultraviolet photons into visible light photons, reduce ultraviolet erosion on the coating and improve the visible light reflectivity.
Generally, as shown in fig. 2, the printing grid region 1 of the photovoltaic adhesive film is mainly the region outside the region covered by the cell sheet 2 on the adhesive film, and the printing position and size of the printing grid region vary according to the arrangement of the cell sheets 2. As shown in table 1, the baking temperature, crosslinking pattern, fluidity and properties of the conventional thermosetting, thermoplastic, UV and microwave curable coatings are not suitable for the printing of the grid area, and the components thereof are not suitable for electron beam curing, which makes the conventional thermosetting, thermoplastic, UV and microwave curable coatings difficult to be suitable for coating on the printing of the grid area and curing by electron beam.
TABLE 1 comparison of weather-resistant coating and traditional coating on photovoltaic adhesive film
Therefore, referring to fig. 3, the invention designs a weather-resistant fluorine coating suitable for electron beam curing for a printing grid area of a photovoltaic adhesive film, and the weather-resistant fluorine coating is prepared by taking main body resin, pigment and filler, an active diluent, a conventional assistant, a rheological assistant and down-conversion nano powder as raw materials to prepare reactive liquid, taking a certain dosage of electron beams as radiation energy, enabling molecules of high-energy electron beams and the coating to interact and decompose into free radicals, enabling the free radicals to react with C ═ C double bonds in the coating and the adhesive film to form a chain lengthening chain, enabling the reactive liquid to generate curing crosslinking through the reaction of the chain lengthening chain with the rest C ═ C components in the weather-resistant fluorine coating and the adhesive film, and inducing the reactive liquid to be quickly converted into a solid, and having good adhesive force, namely the weather-resistant fluorine coating; the rheological property and the crosslinking property of the fluorine coating are improved through the proportion of the raw materials, the rheological requirement of a printing grid area on the printing of the weather-resistant coating can be met, the thixotropic index of the fluorine coating is not less than 4.0, the printing coating is smooth, the boundary is clear, the weather-resistant fluorine coating can be formed after the crosslinking and curing of electron beams, the printing production efficiency is greatly improved, the low-temperature curing of the printing coating is realized, and the problems of insufficient overflow, heating and curing and adhesive force existing in the traditional coating on adhesive film printing are solved; meanwhile, the addition of the down-conversion material can convert light rays in an ultraviolet light area into visible light with good photoelectric response of the crystalline silicon battery, and the weather resistance and the reflectivity of the fluorine coating are enhanced. Specifically, the electron beam is, for example but not limited to, a curtain-like electron beam, and the irradiation dose is 10-40kGy, and the linear speed is 40-80 m/min.
Since electron beam curing is transparent to the material, transparent and opaque materials can be penetrated, and the mass density of the material has a large influence on the electron beam. Therefore, for fluorine coatings with different densities and coating thicknesses, the acceleration voltage of the electron beam can be properly adjusted to achieve enough energy in the coating to achieve sufficient crosslinking and curing of the coating. When the coating thickness of the general weather-resistant coating is 3-50 mu m, the weather-resistant coating can be completely dried and cured on the surface of the photovoltaic adhesive film in 1/10 seconds, so that the production efficiency is greatly improved.
Further, the present invention provides a fluorine coating layer formed by using the electron beam cured weather-resistant fluorine paint.
Further, the present invention provides a photovoltaic adhesive film (i.e., a grid adhesive film), comprising: the coating comprises a film substrate, a printing grid area arranged on the film substrate, and the weather-resistant fluorine coating which covers the printing grid area and is as described above.
Optionally, the adhesive film substrate includes but is not limited to a transparent adhesive film, a white adhesive film, a black adhesive film, a color adhesive film, and the like, the type of the adhesive film is one of an upper adhesive film or a lower adhesive film, a printing surface of a coating layer is a surface close to the battery piece, and the printing surface of the adhesive film is not embossed or is not embossed to a depth of 0.5mm or less. Further, as shown in fig. 1, the invention provides a preparation method of a photovoltaic grid adhesive film, comprising the following steps: preparing electron beam cured weather resistant fluorine paint; coating weather-resistant fluorine paint on a printing grid area on a glue film substrate; electron beam crosslinking and curing; and (4) performing corona treatment.
Optionally, the printing area on the adhesive film substrate needs to extend 1-3mm to the battery piece covering area on the basis of the grid area.
Optionally, the weather-resistant fluorine paint is applied by screen printing or gravure printing.
Optionally, the thickness of the weather-resistant fluorine coating (i.e. the thickness of the weather-resistant fluorine coating after curing and drying) is 3-50 μm, optionally 15 μm, 22 μm, 36 μm.
Optionally, the method for preparing the weather-resistant fluorine coating comprises the following steps: mixing the main resin, the pigment and filler, the down-conversion nano powder, the active diluent and the conventional auxiliary agent according to a ratio, and uniformly dispersing at a high speed in a dispersion machine to prepare pre-grinding slurry, wherein the rotating speed is 500 plus one (1000) revolutions per minute, the dispersion time is 30-60min, and the temperature of the stirring material is less than or equal to 50 ℃; grinding the pre-ground slurry by a disc type sand mill at the rotation speed of 800-
Grinding the slurry to the fineness of less than or equal to 5 mu m to obtain concentrated slurry; and then mixing the concentrated slurry, the residual main body resin, the active diluent and the rheological additive according to a ratio, and uniformly dispersing at a high speed under a dispersion machine to prepare a fluorine coating finished product with thixotropy, wherein the rotating speed is 500 plus materials and 1000 r/min, the dispersion time is 60-90min, and the temperature of the stirred materials is less than or equal to 60 ℃.
A second part:
example 1
The fluorine paint was prepared, stirred, and ground according to the raw material formulation shown in table 2. And (3) grinding: stirring at 1000 rpm for 30min, grinding at 1000 rpm and 800kg/h for 3 times; and (3) secondary burdening stage: 800 r/min, the dispersion time is 90min, and the temperature of the stirred material is less than or equal to 60 ℃. Transferring the prepared white coating to a transparent EVA adhesive film in a screen printing mode, and carrying out electron beam curing, wherein the electron beam irradiation dose is 15kGy, and the corona intensity is 4.5kW, so that the photovoltaic grid adhesive film can be prepared.
Table 2 raw material recipe of example 1
Example 2
The fluorine paint was prepared, stirred, and ground according to the raw material formulation shown in table 3. And (3) grinding: stirring at 1000 rpm for 30min, grinding at 1000 rpm and 800kg/h for 3 times; and (3) secondary burdening stage: 800 r/min, the dispersion time is 90min, and the temperature of the stirred material is less than or equal to 60 ℃. Transferring the prepared white coating to a transparent POE adhesive film in a screen printing mode, and carrying out electron beam curing, wherein the irradiation dose of an electron beam is 15kGy, and the corona intensity is 5.0kW, so that the photovoltaic grid adhesive film can be prepared.
Table 3 raw material recipe of example 2
Example 3
The fluorine paint was prepared, stirred, and ground according to the raw material formulation shown in table 3. And (3) grinding: stirring at 1000 rpm for 30min, grinding at 1000 rpm and 800kg/h for 5 times; and (3) secondary burdening stage: 800 r/min, the dispersion time is 90min, and the temperature of the stirred material is less than or equal to 60 ℃. Transferring the prepared black coating to a transparent EVA adhesive film in a screen printing mode, and carrying out electron beam curing, wherein the electron beam irradiation dose is 25kGy, and the corona intensity is 4.5kW, so that the photovoltaic grid adhesive film can be prepared.
Table 4 raw material recipe of example 3
Example 4
The fluorine paint was prepared, stirred, and ground according to the raw material formulation shown in table 3. And (3) grinding: stirring at 1000 rpm for 30min, grinding at 1000 rpm and 800kg/h for 5 times; and (3) secondary burdening stage: 800 r/min, the dispersion time is 90min, and the temperature of the stirred material is less than or equal to 60 ℃. Transferring the prepared black coating to a transparent EVA adhesive film in a screen printing mode, and carrying out electron beam curing, wherein the electron beam irradiation dose is 20kGy, and the corona intensity is 4.5kW, so that the photovoltaic grid adhesive film can be prepared.
Table 5 raw material recipe of example 4
Example 5
In this example 5, the photovoltaic films prepared in examples 1 to 3 and the cured photovoltaic films coated with the thermosetting coating are tested, and the test results are shown in table 6.
TABLE 6 comparison of Performance of photovoltaic films
According to the photovoltaic grid adhesive film disclosed by the invention, the thixotropic electron beam cured weather-resistant fluorine coating is printed in the printing grid area, and the electron beam curing is carried out, so that the curing time is greatly shortened, the shrinkage rate change of the adhesive film is very little, and the adhesive force of the weather-resistant coating, the bonding strength with the adhesive film, the UV irradiation resistance, the reflectivity and the like are effectively improved; the reason is that the rheological property and the crosslinking property of the coating are improved by matching the coating formula and electron beam curing, the wetting and crosslinking density of the coating and the substrate between the coating and the adhesive film are effectively controlled, no heat baking is carried out, and the shrinkage rate of the adhesive film is nearly zero; due to the introduction of the fluorine material, the weather resistance of the coating is effectively guaranteed; and the introduction of the down-conversion nano material also converts and utilizes photons in an ultraviolet region, thereby reducing the erosion of high-energy ultraviolet rays.
In conclusion, the electron beam cured weather-resistant fluorine coating, the weather-resistant fluorine coating and the photovoltaic adhesive film and the preparation method thereof have the advantages that the main body resin, the pigment and filler, the reactive diluent, the conventional auxiliary agent, the rheological auxiliary agent and the down-conversion nano powder are used as raw materials to be proportioned, the rheological property and the crosslinking property of the weather-resistant fluorine coating are improved, the coating and the adhesive film can be effectively bonded by chemical bonds, the weather-resistant fluorine coating is suitable for printing a printing grid area of the photovoltaic adhesive film, the weather-resistant fluorine coating is formed after electron beam crosslinking curing, the coating is not easy to delaminate, and the weather-resistant fluorine coating has the advantages of uniform.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (17)
1. The electron beam cured weather-resistant fluorine coating is characterized by comprising the following raw materials in parts by mass:
main resin: 40-65 parts;
pigment and filler: 20-50 parts;
active diluent: 10-20 parts;
conventional auxiliary agents: 2-6 parts;
rheological aid: 1-4 parts;
down-conversion of nanopowder: 0.5-3 parts;
wherein, the first grinding dosage of the main resin is as follows: 20-30 parts, and the dosage of secondary ingredients is as follows: 10-45 parts;
the first grinding dosage of the active diluent is as follows: 5-8 parts of secondary ingredients, and 2-15 parts of secondary ingredients;
2. the electron beam cured weatherable fluorine coating according to claim 1,
the host resin includes: fluorine modified epoxy acrylate prepolymer, fluorine modified polyester acrylate prepolymer, fluorine modified polyurethane acrylate prepolymer, hexafluorobutyl acrylate, hexafluoroisopropyl methacrylate, hexafluorobutyl methacrylate, perfluoroalkyl ethyl methacrylate, perfluoro octyl ethyl acrylate, perfluoroalkyl ethyl alcohol. Wherein the primary grinding main body resin and the secondary batching main body resin are the same type or different types.
3. The electron beam cured weatherable fluorine coating according to claim 1,
the pigment and the filler comprise: lithopone, antimony white powder, titanium dioxide, calcium carbonate, barium sulfate, carbon black, graphene, copper chromium black, iron chromium black, phthalocyanine blue, cobalt blue, iron oxide red, zinc iron yellow, cobalt green and cobalt chromium green.
4. The electron beam cured weatherable fluorine coating according to claim 1,
the reactive diluents include: trimethylolpropane triacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate, isobornyl acrylate, 2-ethylhexyl acrylate, beta-hydroxyethyl acrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate, monoethylene glycol diacrylate, 1, 3-butanediol diacrylate, 1, 4-butanediol diacrylate, triethylene glycol divinyl ether, 4-hydroxybutyl vinyl ether, in combination with one or more other additives. Wherein, the active diluent for the first grinding and the active diluent for the second burdening are the same or different.
5. The electron beam cured weatherable fluorine coating according to claim 1,
the conventional auxiliary agent comprises one or more of a dispersing agent, a wetting agent, a defoaming agent, a leveling agent and tackifying resin.
6. The electron beam cured weatherable fluorine coating according to claim 1,
the rheological additive comprises one or more of a thickening agent and a thixotropic agent.
7. The electron beam cured weatherable fluorine coating according to claim 1,
the down-conversion nano powder is rare earth metal doped modified nano powder.
8. The electron beam cured weatherable fluorine coating according to claim 1,
the thixotropic index of the fluorine coating is more than or equal to 4.0 (viscosity value of 0.5 r/min divided by 5 r/min), and the used instrument is a Brookfield viscometer.
9. A weatherable fluorine coating formed using an electron beam cured weatherable fluorine coating.
10. A photovoltaic grid adhesive film is characterized by comprising:
an adhesive film substrate, a printed grid area disposed on the adhesive film substrate, and the electron beam cured weatherable fluorine coating of claim 9 covering the printed grid area.
11. The photovoltaic grid adhesive film of claim 10,
the glue film substrate is one of an upper glue film or a lower glue film.
12. The photovoltaic grid adhesive film of claim 10,
the printing surface of the glue film base body is the surface close to the battery piece.
13. The photovoltaic grid adhesive film of claim 10,
the printing surface of the adhesive film substrate is not subjected to embossing treatment or the embossing depth is less than or equal to 0.5 mm;
14. the photovoltaic grid adhesive film of claim 10,
the printing area on the adhesive film substrate needs to extend 1-3mm to the battery piece covering area on the basis of the grid area.
15. The photovoltaic grid adhesive film of claim 10,
the coating mode of the weather-resistant fluorine paint comprises screen printing or gravure printing.
16. The photovoltaic grid adhesive film of claim 10,
the thickness of the weather-resistant fluorine coating is 3-50 μm.
17. A preparation method of a photovoltaic grid adhesive film is characterized by comprising the following steps:
preparing electron beam cured weather resistant fluorine paint;
printing fluorine coating on a printing grid area on the adhesive film substrate;
electron beam crosslinking and curing;
and (4) performing corona treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011447435.2A CN112552813A (en) | 2020-12-09 | 2020-12-09 | Weather-resistant fluorine coating, photovoltaic adhesive film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011447435.2A CN112552813A (en) | 2020-12-09 | 2020-12-09 | Weather-resistant fluorine coating, photovoltaic adhesive film and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114276722A (en) * | 2021-12-28 | 2022-04-05 | 常州回天新材料有限公司 | Light conversion transparent coating for photovoltaic back plate and preparation method and application thereof |
| CN116904052A (en) * | 2023-08-03 | 2023-10-20 | 四川双特科技有限公司 | Electron beam curing fluorine-containing paint |
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| CN107564984A (en) * | 2017-07-18 | 2018-01-09 | 苏州中来光伏新材股份有限公司 | A kind of high durable, high-gain solar cell backboard, component and preparation method |
| CN111440528A (en) * | 2020-04-13 | 2020-07-24 | 常州威斯敦粘合材料有限责任公司 | Weather-resistant coating, photovoltaic back plate and preparation method of photovoltaic back plate |
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| CN107564984A (en) * | 2017-07-18 | 2018-01-09 | 苏州中来光伏新材股份有限公司 | A kind of high durable, high-gain solar cell backboard, component and preparation method |
| CN111440528A (en) * | 2020-04-13 | 2020-07-24 | 常州威斯敦粘合材料有限责任公司 | Weather-resistant coating, photovoltaic back plate and preparation method of photovoltaic back plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114276722A (en) * | 2021-12-28 | 2022-04-05 | 常州回天新材料有限公司 | Light conversion transparent coating for photovoltaic back plate and preparation method and application thereof |
| CN114276722B (en) * | 2021-12-28 | 2023-08-22 | 常州回天新材料有限公司 | Light-conversion transparent coating for photovoltaic backboard and preparation method and application thereof |
| CN116904052A (en) * | 2023-08-03 | 2023-10-20 | 四川双特科技有限公司 | Electron beam curing fluorine-containing paint |
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Application publication date: 20210326 |