CN114656844A - Fluorocarbon coating, fluorocarbon coating liquid and transparent solar backboard - Google Patents

Fluorocarbon coating, fluorocarbon coating liquid and transparent solar backboard Download PDF

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Publication number
CN114656844A
CN114656844A CN202011552823.7A CN202011552823A CN114656844A CN 114656844 A CN114656844 A CN 114656844A CN 202011552823 A CN202011552823 A CN 202011552823A CN 114656844 A CN114656844 A CN 114656844A
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fluorocarbon
fluorocarbon coating
coating liquid
isocyanate
thickness
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CN114656844B (en
Inventor
汪诚
简伟任
王超
邓文晖
袁南园
唐海江
李刚
张彦
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Ningbo Jiyang New Energy Co ltd
Ningbo Exciton Technology Co Ltd
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Ningbo Jiyang New Energy Co ltd
Ningbo Exciton Technology Co Ltd
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Priority to PCT/CN2021/074402 priority patent/WO2022134270A1/en
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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
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints
    • 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
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/204—Applications use in electrical or conductive gadgets use in solar cells
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention relates to the technical field of solar back panels, in particular to a fluorocarbon coating, a fluorocarbon coating liquid and a transparent solar back panel. The invention provides a transparent solar backboard, aiming at solving the problem of high water vapor transmission rate of the existing transparent solar backboard. The fluorocarbon coating comprises, by weight, 20-40% of fluorocarbon resin, 20-40% of titanium dioxide, 2-5% of matting powder, 0.3-0.6% of additive, 30-50% of adhesion promoter and 5-8% of isocyanate. The transparent solar backboard comprises a white grid fluorocarbon coating, a transparent PO film, a first adhesive layer, a base material, a second adhesive layer and a fluorine film layer from top to bottom in sequence. The transparent solar backboard provided by the invention can effectively reduce the water permeability index of the whole backboard.

Description

Fluorocarbon coating, fluorocarbon coating liquid and transparent solar backboard
Technical Field
The invention relates to the technical field of solar back panels, in particular to a fluorocarbon coating, a fluorocarbon coating liquid and a transparent solar back panel.
Background
Double-sided power generation cells have been widely developed and applied in the photovoltaic field. At present, the back of the double-sided battery piece also has the effect of generating electricity, so the requirement on the water vapor transmission rate (simply called water transmission) performance of the back is gradually improved. In a general transparent back plate, the inner layer is made of transparent fluorocarbon coating, and weather resistance is guaranteed, but the water resistance of the coating is poor, so that the assembly structure of the back glass on some battery pieces with high water permeation requirements is not as good as that of the back glass.
In order to solve the problem of low water permeability of the traditional transparent back plate at present, the inner layer adopts a PO membrane structure for reference, and the low water permeability characteristic of the PO membrane can be utilized to reduce the water resistance of the back plate. Meanwhile, in order to keep the total thickness of the back plate not to change greatly, PET is used as the middle layer to meet the stiffness requirement of the original back plate. And the transparent PO film is synchronously combined with the white grid coating printed on the PO film to shield the gaps of the cell pieces, and the power of the whole assembly can be further improved by utilizing the functions of gap reflection and back light transmission of the cell pieces. The grid transparent back plate can meet the requirements of low water permeability and high power components.
Disclosure of Invention
The invention provides a transparent solar backboard, aiming at solving the problem of high water vapor transmission rate of the existing transparent solar backboard. The inner layer of the solar backboard adopts a transparent PO film, and the water permeability index of the whole backboard can be effectively reduced by utilizing the unique low water permeability (namely low water vapor permeability) characteristic of PO. Meanwhile, according to the patterns distributed by different battery pieces, the appropriate white coating is printed in the gaps of the battery pieces, so that the light utilization rate of the front battery pieces can be effectively improved, and the power of the front assembly is further improved.
Compared with the prior art, the fluorocarbon coating provided by the invention is printed on the surface of the transparent PO film, the main framework structure of PET is reserved on the solar backboard, the combination of physical and mechanical properties and low water permeability is realized, and the adhesive force of the fluorocarbon coating to the PO film and the component power can be effectively improved by the formula of the fluorocarbon coating.
In order to solve the above technical problems, the present invention provides the following technical solutions.
The invention provides a fluorocarbon coating which comprises, by weight, 20-40% of fluorocarbon resin, 20-40% of titanium dioxide, 2-5% of matting powder, 0.3-0.6% of additive, 30-50% of adhesion promoter and 5-8% of isocyanate.
Further, the fluorocarbon resin is selected from one of polytetrafluoroethylene.
Further, the titanium dioxide is in a rutile type; the matting agent is silicon dioxide, the additive is polyacrylate, the adhesion promoter is thermoplastic polyurethane, and the isocyanate is selected from toluene diisocyanate trimer or polymer, hexamethylene diisocyanate trimer or polymer, and isophorone diisocyanate trimer or polymer.
Further, the fluorocarbon coating comprises, by weight, 20-40% of fluorocarbon resin, 20-40% of titanium dioxide, 2-5% of matting powder, 0.3-0.6% of polyacrylate, 30-50% of thermoplastic polyurethane resin, and 5-8% of isocyanate.
In the preparation process, the raw materials of the fluorocarbon coating are prepared into fluorocarbon coating liquid.
The invention provides a fluorocarbon coating liquid, which comprises 20-40 wt% of fluorocarbon resin, 20-40 wt% of titanium dioxide, 2-5 wt% of matting powder, 0.3-0.6 wt% of additive, 30-50 wt% of adhesion promoter and 5-8 wt% of isocyanate.
Further, the fluorocarbon coating liquid also comprises an organic solvent.
In the fluorocarbon coating liquid, the total amount of fluorocarbon resin, titanium dioxide, matting powder, polyacrylate, thermoplastic polyurethane resin, and isocyanate is 100%.
Further, the solid content of the fluorocarbon coating liquid is 50-70%.
Further, in the fluorocarbon coating liquid, the fluorocarbon resin is selected from one of polytetrafluoroethylene; the titanium dioxide is in a rutile type; the matting powder is silicon dioxide; the additive is polyacrylate; the adhesion promoter is thermoplastic polyurethane; the isocyanate is selected from toluene diisocyanate trimer or polymer, hexamethylene diisocyanate trimer or polymer, isophorone diisocyanate trimer or polymer
The fluorocarbon coating liquid is also called fluorocarbon coating.
The proportion of the fluorocarbon coating liquid is limited in the range, the fluorocarbon coating liquid has excellent adhesive force on the transparent PO film after curing is finished, the packaging strength requirement is met, meanwhile, the fluorocarbon coating liquid has certain reflectivity, and the fluorocarbon coating liquid has good significance for improving the power of the assembly.
Further, the solid content of the fluorocarbon coating liquid is preferably 58% to 65%.
The solid content of the fluorocarbon coating liquid is limited in the range, so that the fluorocarbon layer can be uniformly coated on the surface of the base material.
Further, the fluorocarbon resin may be one or more of polytetrafluoroethylene.
The fluorocarbon resin can realize the characteristic of weather resistance by utilizing the characteristic of high bond energy of fluorine-carbon bonds. And the molecular bond of the polytetrafluoroethylene does not contain other atoms, so that stronger ultraviolet light energy can be blocked in the aspect of weather resistance, and further the guarantee of the weather resistance of the product is realized.
Further, the fluorocarbon resin is a thermosetting resin.
The fluorocarbon resin is provided by a bulk metalworking.
Furthermore, the titanium dioxide is rutile type, and has the effects of hydrolysis resistance and UV resistance.
Further, the titanium dioxide is available from dupont.
Further, the matting powder is silica particles.
Further, the silica particles are provided by Grace.
Furthermore, the added auxiliary agent is used for modifying fluorocarbon resin, and the addition type is polyacrylate type.
The polyacrylate type is mainly used for regulating and controlling the bonding force of the fluorocarbon coating after weather resistance.
The polyacrylate is provided by pycnoch chemistry.
Further, the adhesion promoter added is thermoplastic polyurethane. The thermoplastic polyurethane can effectively improve the adhesive force of the fluorocarbon coating to the PO film.
The promoter is provided by the prochloraz chemistry.
Further, the curing agent species is of the isocyanate type.
Further, the isocyanate may be toluene diisocyanate trimer or multimer, hexamethylene diisocyanate trimer or multimer, isophorone diisocyanate trimer or multimer.
Further, the isocyanate is available from bayer corporation.
The organic solvent is selected from one or the combination of at least two of ethyl acetate, butyl acetate, butanone and cyclohexanone.
Further, the fluorocarbon coating liquid comprises 23% -27% of fluorocarbon resin, 22% -28% of titanium dioxide, 35% -45% of thermoplastic polyurethane, 2% -4% of matting powder, 0.3% -0.5% of polyacrylate and 5.7% -7.5% of isocyanate, and the solid content is controlled to be 58% -65%. The thickness of the selected PO film is 120-180 mu m, the thickness of the base material PET is 125-188 mu m, and the thickness of the fluorocarbon coating is 14-15 mu m. The above technical solutions include embodiments 2, 5, and 6.
By limiting the formula of the fluorocarbon coating to the preferable parameter range, the coating can be ensured to have high wet heat aging resistance, and high strength can be maintained after wet heat aging.
The invention also provides a solar backboard, which sequentially comprises a white latticed fluorocarbon coating, a transparent PO film, a first adhesive layer, a base material, a second adhesive layer and a fluorine film layer from top to bottom. The PO film refers to a polyolefin film.
The white latticed fluorocarbon coating is the fluorocarbon coating provided by the invention.
The white latticed fluorocarbon coating is formed by the fluorocarbon coating liquid provided by the invention.
Further, the base material is a transparent base material, and the material of the base material is selected from poly (p-xylylene glycol) (PET).
Further, the first adhesive layer and the second adhesive layer are collectively referred to as adhesive layers. The adhesive layer is formed by an adhesive. The adhesive is a polyester adhesive.
Further, the fluorine film layer is a transparent PVF film or PVDF film.
Further, the thickness of the grid white fluorocarbon layer is 10-20 μm; the thickness of the transparent PO film is 50-300 mu m; the thickness of the first adhesive layer is 6-10 mu m; the thickness of the substrate layer is 50-300 mu m; the thickness of the second adhesive layer is 6-10 mu m; the thickness of the fluorine film layer is 20-25 μm.
Furthermore, the thickness of the fluorocarbon coating is preferably 14-15 μm, the thickness of the PO film is preferably 120-180 μm, and the thickness of the PET substrate layer is preferably 125-188 μm.
The transparent grid solar backboard provided by the invention can be used as an outermost layer backboard packaging material of a photovoltaic module.
The preparation method of the solar backboard provided by the invention comprises the following steps:
firstly, coating a white fluorocarbon coating on the surface of a transparent PO film by using a grid printing mode, and placing the PO film in a circulating oven for thermosetting treatment to form a white grid fluorocarbon layer; coating a layer of adhesive on the PET substrate, placing the PET substrate in a circulating oven for thermosetting treatment, and attaching the printed transparent PO film; then coating an adhesive layer on the other surface of the substrate, placing the substrate in a circulating oven for drying, and attaching a fluorine film layer; finally, carrying out primary curing reaction.
Further, the temperature for drying the white grid fluorocarbon circulating oven is 80 ℃, and the time is 2 minutes.
Further, the drying temperature of the adhesive layer was 90 ℃ and the time was 2 minutes.
Further, the aging reaction temperature was 50 ℃ and the time was 48 hours.
Further, the substrate was a model KP20 substrate available from nivaleton. The substrate is also referred to as a PET substrate.
The coating process, the thermal curing process, and the bonding process can be set according to the prior art.
Before the fluorocarbon coating liquid is coated on the surface of the substrate, the preparation method also comprises the step of configuring the fluorocarbon coating into the fluorocarbon coating liquid.
The fluorocarbon resin and the titanium dioxide in the fluorocarbon layer coating liquid provided by the invention have important influence on the wet and heat aging performance.
The fluorocarbon film provided by the invention realizes the following technical effects:
1. after the fluorocarbon layer coating liquid is solidified into the fluorocarbon layer, the solar backboard inner layer material which is resistant to aging and meets the packaging strength can be realized. The polytetrafluoroethylene material used in the method can further improve the weather resistance of the PO material due to the strong perfluorocarbon bond energy, and realize the weather resistance test of the transparent backboard.
2. The fluorocarbon coating liquid is solidified into a white fluorocarbon layer, and the cost performance of low water permeability and high power of the transparent back plate can be realized by matching with the transparent PO film.
Compared with the existing transparent solar backboard, the fluorocarbon coating in the transparent solar backboard provided by the invention has high reflectivity and high adhesive force with the PO film, and the PO film effectively reduces the water vapor transmission rate. The transparent solar backboard provided by the invention can effectively reduce the water permeability index of the whole backboard. Meanwhile, according to the patterns distributed by different battery pieces, the appropriate white coating is printed in the gaps of the battery pieces, so that the light utilization rate of the front battery pieces can be effectively improved, and the power of the front assembly is further improved.
Drawings
FIG. 1 is a top view of a grid coating;
fig. 2 is a schematic structural diagram of a solar back panel provided by the invention.
Detailed Description
For a better understanding of the present invention, its structure, and the functional features and advantages attained by its structure, reference is made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:
as shown in fig. 1 and fig. 2, the transparent solar back sheet provided by the present invention sequentially comprises, from top to bottom, a white latticed fluorocarbon coating layer 60, a transparent PO layer 50, a first adhesive layer 40, a substrate layer 30, a second adhesive layer 20, and a fluorine film layer 10.
The preparation method of the solar back panel film provided by the invention comprises the following steps:
(1) coating a white coating liquid on the surface of the transparent PO by using a grid printing mode, and placing the PO in a circulating oven for curing treatment to form a white fluorocarbon layer; (2) coating an adhesive layer on the surface of PET, placing in a circulating oven for thermosetting treatment, and attaching a transparent PO film to obtain a semi-finished product; (3) coating an adhesive on the other side of the semi-finished product substrate to form an adhesive layer, placing the adhesive layer in a circulating oven for drying treatment, and then compounding a fluorine film layer; (4) curing and reacting the solar backboard finished product; (5) and laminating the solar backboard and the EVA to prepare a simulation test packaging strength.
Further, (1) in the process, the drying temperature of a circulating oven for treating the white fluorocarbon layer is 80 ℃, the time is 2 minutes, and the grid layer can be processed by a printing or roller coating scheme;
further, (2) (3) the temperature of a circulating oven for drying the adhesive in the process of (1) is 90 ℃, and the time is 2 minutes;
further, the aging treatment temperature in the process (4) was 50 ℃ for 48 hours.
Further, the lamination parameters of the (5) process are suggested to be a temperature of 145 ℃, evacuation for 6 minutes, deflation for 30 seconds, lamination pressure of 0.1MPa, and lamination for 12 minutes.
Further, the laminated EVA of choice is F806 supplied by foster.
Further, the substrate selected was a model KP20 substrate available from ningcrobang. The substrate is also referred to as a PET substrate.
The above preparation method further includes a step of configuring the fluorocarbon layer as the fluorocarbon layer coating liquid before applying the fluorocarbon layer coating liquid on the surface of the transparent PO film.
The solar backboard provided by the invention is subjected to the following tests:
the adhesive force of the fluorocarbon coating is as follows: the adhesion of the fluorocarbon layer to the transparent PO film in the transparent solar backsheet film was tested according to the criteria of GB1720-1979 "paint adhesion assay", wherein 100/100 represents no release and 90/100 represents 10% release.
Testing the packaging strength: and testing the bonding strength of the inner fluorocarbon layer and the EVA according to the standard of GB/T31034-.
QUV aging treatment: treating the silicon solar cell module by using an ultraviolet aging lamp according to the standard of GB/T31034-.
Reflectance ratio: the reflectivity test is carried out according to the standard of GB/T31034-
And (3) performing damp heat aging treatment: according to the standard of GB/T31034-.
The fluorocarbon coating liquid and fluorocarbon layer provided by the present invention will be further described with reference to examples.
Example 1
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
36 percent of polytetrafluoroethylene type fluorocarbon resin, 23.6 percent of titanium dioxide, 2 percent of matting powder, 33 percent of thermoplastic polyurethane, 0.4 percent of polyacrylate additive and 5 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 50%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 50 μm and the PET thickness of the backsheet being 250 μm.
The thickness of the formed white fluorocarbon layer was 17 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 2
The preparation method of the fluorocarbon coating liquid provided by the embodiment includes:
25 percent of polytetrafluoroethylene type fluorocarbon resin, 25 percent of titanium dioxide, 3 percent of matting powder, 40 percent of thermoplastic polyurethane, 0.4 percent of polyacrylate additive and 6.6 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 60%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 150 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 14 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 3
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
20 percent of polytetrafluoroethylene type fluorocarbon resin, 40 percent of titanium dioxide, 3 percent of matting powder, 31 percent of thermoplastic polyurethane, 0.4 percent of polyacrylate additive and 5.6 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 55%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform transparent PO, the PO thickness being 250 μm and the PET thickness of the backsheet being 100 μm.
The thickness of the white fluorocarbon layer was 20 μm.
The performance test results of the fluorocarbon coatings obtained are shown in table 1.
Example 4
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
40 percent of polytetrafluoroethylene type fluorocarbon resin, 20 percent of titanium dioxide, 4 percent of matting powder, 30 percent of thermoplastic polyurethane, 0.6 percent of polyacrylate additive and 5.4 percent of isocyanate. And dispersing the main resin in an organic solvent to form a fluorocarbon coating liquid with the solid content of 70%. The polytetrafluoroethylene fluorocarbon resin is provided by a aurora chemical company, the titanium dioxide is provided by a DuPont company, the thermoplastic polyurethane is provided by a Heda chemical company, the matting powder is provided by a Graes company, the polyacrylate is provided by a Pico chemical company, the isocyanate is provided by a Bayer company, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 210 μm and the PET thickness of the backsheet being 100 μm.
The thickness of the formed white fluorocarbon layer was 10 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 5
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
23 percent of polytetrafluoroethylene type fluorocarbon resin, 22 percent of titanium dioxide, 2 percent of matting powder, 45 percent of thermoplastic polyurethane, 0.5 percent of polyacrylate additive and 7.5 percent of isocyanate. And dispersing the main resin in an organic solvent to form a fluorocarbon coating liquid with the solid content of 58%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 120 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 15 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 6
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
27 percent of polytetrafluoroethylene type fluorocarbon resin, 28 percent of titanium dioxide, 4 percent of matting powder, 35 percent of thermoplastic polyurethane, 0.3 percent of polyacrylate additive and 5.7 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 65%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 180 μm and the PET thickness of the backsheet being 125 μm.
The thickness of the formed white fluorocarbon layer was 15 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 7
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
30 percent of polytetrafluoroethylene type fluorocarbon resin, 21 percent of titanium dioxide, 5 percent of matting powder, 36 percent of thermoplastic polyurethane, 0.5 percent of polyacrylate additive and 7.5 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 67%. The polytetrafluoroethylene fluorocarbon resin is provided by a aurora chemical company, the titanium dioxide is provided by a DuPont company, the thermoplastic polyurethane is provided by a Heda chemical company, the matting powder is provided by a Graes company, the polyacrylate is provided by a Pico chemical company, the isocyanate is provided by a Bayer company, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 65 μm and the PET thickness of the backsheet being 275 μm.
The thickness of the white fluorocarbon layer was 16 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 8
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
21 percent of polytetrafluoroethylene type fluorocarbon resin, 21 percent of titanium dioxide, 2.5 percent of matting powder, 50 percent of thermoplastic polyurethane, 0.3 percent of polyacrylate additive and 5.2 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 52 percent. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 80 μm and the PET thickness of the backsheet being 250 μm.
The thickness of the white fluorocarbon layer was 18 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 9
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
33 percent of polytetrafluoroethylene type fluorocarbon resin, 23 percent of titanium dioxide, 3 percent of matting powder, 32.5 percent of thermoplastic polyurethane, 0.5 percent of polyacrylate additive and 8 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 63%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 270 μm and the PET thickness of the backsheet being 50 μm.
The thickness of the white fluorocarbon layer was 15 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Example 10
The preparation method of the fluorocarbon coating liquid provided by the embodiment comprises the following steps:
29 percent of polytetrafluoroethylene type fluorocarbon resin, 30.5 percent of titanium dioxide, 3 percent of matting powder, 32 percent of thermoplastic polyurethane, 0.3 percent of polyacrylate additive and 5.2 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 53 percent. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 300 μm and the PET thickness of the backsheet being 50 μm.
The thickness of the white fluorocarbon layer was 17 μm.
Comparative example 1
The preparation method of the fluorocarbon coating liquid provided by the comparative example comprises the following steps:
25% of polytrifluoroethylene type fluorocarbon resin, 25% of titanium dioxide, 3% of matting powder, 40% of thermoplastic polyurethane, 0.4% of polyacrylate additive and 6.6% of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 60%. The polytetrafluoroethylene fluorocarbon resin is provided by Dongfluoromethane, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by Poda, the matting powder is provided by Grace, Inc., the polyacrylate is provided by Picker, the isocyanate is provided by Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 150 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 14 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Comparative example 2
The preparation method of the fluorocarbon coating liquid provided by the comparative example comprises the following steps:
25% of titanium dioxide, 3% of matting powder, 65% of thermoplastic polyurethane, 0.4% of polyacrylate additive and 6.6% of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 60%. Wherein the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by Podamard, the matting powder is provided by Grace, Inc., the polyacrylate is provided by Picker, the isocyanate is provided by Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 150 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 14 μm.
The performance test results of the fluorocarbon coatings obtained are shown in table 1.
Comparative example 3
The preparation method of the fluorocarbon coating liquid provided by the comparative example comprises the following steps:
65 percent of polytetrafluoroethylene type fluorocarbon resin, 25 percent of titanium dioxide, 3 percent of matting powder, 0.4 percent of polyacrylate additive and 6.6 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 60%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalluric acid chemical, the titanium dioxide is provided by DuPont, the matting powder is provided by Grace, Inc., the polyacrylate is provided by Pickering chemistry, the isocyanate is provided by Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 150 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 14 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
Comparative example 4
The preparation method of the fluorocarbon coating liquid provided by the comparative example comprises the following steps:
50 percent of polytetrafluoroethylene type fluorocarbon resin, 25 percent of titanium dioxide, 3 percent of matting powder, 15 percent of thermoplastic polyurethane, 0.4 percent of polyacrylate additive and 6.6 percent of isocyanate. And dispersing the main resin in an organic solvent to form the fluorocarbon coating liquid with the solid content of 60%. The polytetrafluoroethylene fluorocarbon resin is provided by a metalaxyl fluoride chemical, the titanium dioxide is provided by DuPont, the thermoplastic polyurethane is provided by a Heda chemical, the matting powder is provided by a Grace finite company, the polyacrylate is provided by a Pico chemical, the isocyanate is provided by a Bayer, and the organic solvent is butyl acetate.
The coating was applied to the preform clear PO, the PO thickness being 150 μm and the PET thickness of the backsheet being 188 μm.
The thickness of the white fluorocarbon layer was 14 μm.
The results of the performance tests of the fluorocarbon coatings obtained are shown in table 1.
The fluorocarbon films in examples 1 to 10 and comparative examples 1 to 4 were subjected to the following tests: the adhesion of the white grid fluorocarbon coating to the clear fluorocarbon coating was tested according to the standard of GB1720-1979 "paint adhesion test", where 100/100 represents no release and 90/100 represents 10% release. The solar back sheet was tested for its packaging strength, resistance to wet heat aging and QUV change in accordance with the standards of GB/T31034-2014 insulating back sheet for crystalline silicon solar cell modules.
Table 1 main performance test results of fluorocarbon coatings and transparent solar back sheets formed from fluorocarbon coating liquids provided in examples 1 to 10 and comparative examples 1 to 4
Figure BDA0002858170550000141
Figure BDA0002858170550000151
As can be seen from table 1 above, when no thermoplastic polyurethane was added or the addition ratio was low, the adhesion of the white fluorocarbon layer to the PO film was poor. When a polytrifluoroethylene type fluorocarbon resin is used, the initial adhesion is also poor and embrittlement occurs after both UV aging test and damp heat aging test. Because the polytetrafluoroethylene resin has enough strong fluorocarbon bond energy, the stability of molecules can be kept in the aging process, and the aging characteristic of the whole backboard test is further ensured. The other molecular bond of the polytrifluoroethylene system is C-Cl bond energy, and the bond energy is relatively weak and can be cracked after aging. The thermoplastic polyurethane resin is an indispensable component which has an effect of promoting the adhesion of the coating layer to the PO surface.
The solar backboard provided by the invention can ensure the packaging strength and the weather resistance at the same time. The fluorocarbon coatings provided by the examples 2, 5 and 6 have better performance, the fluorocarbon coatings have good adhesion and do not fall off, the initial packaging strength is at least 80N/cm, the reflectivity is at least more than 83%, the water vapor (water vapor) transmittance is lower than 0.68 g/square meter, no obvious appearance change exists after the square meter is tested by QUV for 120kwh, and the packaging strength is at least 60N/cm after the square meter is tested by high-humidity heat aging.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are included in the scope of the claims of the present invention.

Claims (10)

1. The fluorocarbon coating is characterized by comprising 20-40 wt% of fluorocarbon resin, 20-40 wt% of titanium dioxide, 2-5 wt% of matting powder, 0.3-0.6 wt% of additive, 30-50 wt% of adhesion promoter and 5-8 wt% of isocyanate.
2. Fluorocarbon coating according to claim 1, characterized in that said fluorocarbon resin is selected from one of polytetrafluoroethylene.
3. Fluorocarbon coating according to claim 1, characterized in that said titanium dioxide is of rutile type; the matting powder is silicon dioxide; the additive is polyacrylate; the adhesion promoter is thermoplastic polyurethane; the isocyanate is selected from toluene diisocyanate trimer or polymer, hexamethylene diisocyanate trimer or polymer, isophorone diisocyanate trimer or polymer.
4. The fluorocarbon coating liquid is characterized by comprising 20-40 wt% of fluorocarbon resin, 20-40 wt% of titanium dioxide, 2-5 wt% of matting powder, 0.3-0.6 wt% of additive, 30-50 wt% of adhesion promoter and 5-8 wt% of isocyanate.
5. A fluorocarbon coating liquid as claimed in claim 4, wherein said fluorocarbon coating liquid further comprises an organic solvent, and the total amount of fluorocarbon resin, titanium dioxide, matting agent, additive, adhesion promoter, and isocyanate in said fluorocarbon coating liquid is 100%.
6. A fluorocarbon coating liquid according to claim 4, wherein said fluorocarbon coating liquid has a solid content of 50 to 70%.
7. A fluorocarbon coating liquid as set forth in claim 4 wherein said fluorocarbon resin is selected from one of polytetrafluoroethylene; the titanium dioxide is in a rutile type; the matting powder is silicon dioxide; the additive is polyacrylate; the adhesion promoter is thermoplastic polyurethane; the isocyanate is selected from toluene diisocyanate trimer or polymer, hexamethylene diisocyanate trimer or polymer, isophorone diisocyanate trimer or polymer.
8. The transparent solar backboard is characterized by sequentially comprising a white grid fluorocarbon coating, a transparent PO film, a first adhesive layer, a base material, a second adhesive layer and a fluorine film layer from top to bottom.
9. The solar back sheet according to claim 8, wherein the white meshed fluorocarbon coating comprises, by weight, 20% to 40% of fluorocarbon resin, 20% to 40% of titanium dioxide, 2% to 5% of matting powder, 0.3% to 0.6% of polyacrylate, 30% to 50% of thermoplastic polyurethane resin, and 5% to 8% of isocyanate.
10. The solar back sheet according to claim 9, wherein the thickness of the white mesh fluorocarbon coating is 10 to 20 μm; the thickness of the transparent PO film is 50-300 mu m; the thickness of the base material is 250-300 mu m; the thickness of the first adhesive layer is 6-10 mu m; the thickness of the fluorine film layer is 20-25 μm.
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