A double-sided coating transparent backboard and a preparation method thereof

Abstract

The present application relates to photovoltaic cell packaging technical field, especially a kind of double-sided coating transparent backboard and preparation method thereof;Including the following steps: 1) PET substrate film single side coating;2) coating surface drying operation;3) plasma surface treatment: substrate film after drying in step 2) From oven to plasma processor, the surface of coating layer is carried out plasma grafting treatment;Mixing carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis (3-aminopropyl) polyethylene glycol, one or more of amino ether acid gas in nitrogen-based atmosphere as dopant gas;4) the transparent substrate film treated in step 3) From oven to winding device;5) PET transparent substrate B side coating treatment: the prepared substrate film B side is carried out 1) 2) 3) Same processing mode, finally obtain the double-sided coating transparent backboard;The present application has the advantages such as simple preparation process, economic and environmental protection, strong adhesion, good weather resistance, etc.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cell packaging, in particular to a double-coated transparent backboard and a preparation method thereof. BACKGROUND

[0002] The traditional double-coated transparent backboard is prepared by the outer protective layer gluing and compounding method, which comprises the following steps:

[0003] 1) PET transparent substrate film single-side gluing and compounding with polyvinylidene fluoride film

[0004] 2) The other un-compounded side is subjected to the same compounding operation as step) 1

[0005] The main manufacturers of polyvinylidene fluoride film are Japanese enterprises, the material price is high, and the supply is unstable, and the traditional method needs 4-6 days for curing. SUMMARY

[0006] The purpose of the present application is to overcome the deficiencies in the prior art and provide a preparation method of a double-coated transparent backboard.

[0007] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0008] A preparation method of a double-coated transparent backboard, the preparation method comprises the following steps:

[0009] 1) PET substrate film single-side coating: sending the PET transparent substrate film from the unwinding mechanism to the coating mechanism, using a slot coater to coat the fluorine coating liquid on the A side of the PET substrate film;

[0010] 2) Coating surface drying operation: sending the coated substrate film in step 1) from the coating mechanism to the oven, and segmentally drying the coated substrate film;

[0011] 3) Plasma surface treatment: sending the dried substrate film in step 2) from the oven to the plasma treatment machine, and performing plasma grafting treatment on the coating layer surface; mixing one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis(3-aminopropyl) polyethylene glycol, and amino ether acid gas as a gas of a dopant in a nitrogen-based atmosphere;

[0012] 4) Sending the treated transparent substrate film in step 3) from the oven to the winding device;

[0013] 5) PET transparent substrate B-side coating treatment: performing the same treatment as 1), 2) and 3) on the prepared B side of the substrate film, and finally obtaining the double-coated transparent backboard.

[0014] Further, the fluorine-containing coating solution in the step 1) comprises a main agent and a solvent, the main agent is a product of copolymerization of one of methyl acrylate, butyl acrylate and acrylic acid mono-2-ethylhexyl ester as a main agent with an unsaturated olefin selected from one of styrene, acrylonitrile or vinyl acetate.

[0015] Further, the main agent is selected from one or several of tetrafluoroethylene / vinyl ether copolymer, tetrafluoroethylene / vinyl ester copolymer, tetrafluoroethylene / alkyl vinyl ether copolymer, tetrafluoroethylene / alkyl vinyl ester copolymer.

[0016] Further, the coating composition comprises the following components in percentage by weight: tetrafluoroethylene / vinyl ester copolymer 20-40%, tetrafluoroethylene / alkyl vinyl ester copolymer 20-50%, butyl acetate 30-50% and curing agent 5-10%.

[0017] Further, the production running speed of the coating production line in the step 2) is 30 m / min-50 m / min.

[0018] Further, the oven in the step 2) comprises oven 1, oven 2 and oven 3, the temperature in the oven 1 is 80℃-120℃, the temperature in the oven 2 is 100℃-130℃, and the temperature in the oven 3 is 110℃-150℃.

[0019] Further, the volume percentage composition of the nitrogen-based atmosphere in the step 3) is as follows: nitrogen 65-85%, bis(3-aminopropyl)polyethylene glycol 1-5%, amino ether acid 3-5%, carbon tetrafluoride 4-5%, nitrogen trifluoride 1-5%, sulfur hexafluoride 1-5%, and air 5-10%.

[0020] Another object of the present application is to overcome the deficiencies in the prior art and provide a double-sided coating transparent backboard.

[0021] A double-sided coating transparent backboard prepared by the aforementioned preparation method, from top to bottom, comprises a fluorine-containing plasma grafting layer, a first fluorocarbon coating layer, a transparent substrate layer, a second fluorocarbon coating layer and a fluorine-containing plasma grafting layer.

[0022] Further, the thickness of the transparent substrate layer is 280-300 μm, the thickness of the first fluorocarbon coating layer and the second fluorocarbon coating layer is 6-12 μm, and the thickness of the fluorine-containing plasma grafting layer is 1-4 μm.

[0023] The beneficial effects of the technical solution of the present application are:

[0024] The preparation method of the double-sided coating transparent backboard in the application coats a first fluorocarbon coating layer and a second fluorocarbon coating layer on both sides (named as A and B layers herein) of a transparent substrate respectively to obtain a double-sided coating type transparent substrate; and an ion grafting layer is formed on the outer layer of the transparent substrate by mixing one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis (3-aminopropyl) polyethylene glycol and amino ether acid gas into a nitrogen-based atmosphere to form other fluorine-containing groups, so that good weather resistance and corrosion resistance are achieved.

[0025] Meanwhile, the number of amide groups and imide groups can be reduced by adding one or more of oxygen, nitrogen and hydrogen in the air to generate more amino groups. Therefore, the surface chemical substances are adjusted to form a high surface factor, so that good adhesion is obtained, and the conditions required for crosslinking with ink and other materials are formed.

[0026] The application has the advantages of simple preparation process, economy, environmental protection, strong adhesion, good weather resistance and the like.

[0027] The outer layer compounding process used in the application is different from the traditional compounding process, the problems of low peeling strength and high cost of the traditional compounding polytetrafluoroethylene film and the problem that the polytetrafluoroethylene film material is subject to Japanese manufacturers are solved, the maturation time of the traditional compounding method is avoided, and the processing time is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The figure is a structural schematic diagram of the double-sided coating transparent backboard in the application.

[0029] Figure 2 The figure is a process flow diagram of the preparation method in the application.

[0030] In the figure: 1, fluorine-containing ion grafting layer; 2, first fluorocarbon coating layer; 3, transparent substrate layer; 4, second fluorocarbon coating layer; 5, unwinding mechanism; 6, coating mechanism; 7, oven one; 8, oven two; 9, oven three; 10, ion processing machine; 11, winding mechanism. DETAILED DESCRIPTION

[0031] The double-sided coating transparent backboard and the preparation method thereof in the application will be further described below in combination with specific embodiments.

[0032] Example 1

[0033] Please refer to Figure 1 and Figure 2 The application provides a preparation method of a double-sided coating transparent backboard, which comprises the following steps:

[0034] (1) PET substrate film single side coating: 280 μm-300 μm PET transparent substrate film is sent from the unwinding mechanism 11 to the coating mechanism 6, fluorine-containing coating liquid is used to coat the PET substrate film A side using a slot coater; the coating layer is a product of copolymerization of one of ethyl methacrylate, butyl acrylate and acrylic acid mono-2-ethylhexyl ester as the main agent and styrene, acrylonitrile or vinyl acetate; at the same time, one or more of tetrafluoroethylene / vinyl ether copolymer, tetrafluoroethylene / vinyl ester copolymer, tetrafluoroethylene / alkyl vinyl ether copolymer, tetrafluoroethylene / alkyl vinyl ester copolymer is added to the solvent; the adhesion strength of the transparent back plate and the protective outer layer is increased, the peeling force is enhanced, and the corrosion resistance and weather resistance are increased to prevent delamination; the production running speed of the coating production line is 30 m / min; the coating includes a main agent and a solvent, and the coating composition includes the following components in the following weight percentages: tetrafluoroethylene / vinyl ester copolymer 20%, tetrafluoroethylene / alkyl vinyl ester copolymer 40%, butyl acetate 35%, and curing agent 5%.

[0035] (2) Coating surface drying operation: the substrate film from the coating head is sent to the oven from the coating mechanism 6, and the coated substrate film is dried; the oven is divided into three sections, the temperature in the oven one 7 is 120°C, the temperature in the oven two 8 is 130°C, and the temperature in the oven three 9 is 140°C. The production running speed of the coating production line is 30 m / min;

[0036] (3) Plasma surface treatment: the substrate film after drying is sent from the oven to the plasma treatment machine 10, and the coating layer surface is treated by plasma grafting; one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis(3-aminopropyl) polyethylene glycol, and amino ether acid gas is mixed into the atmosphere dominated by nitrogen as a dopant gas, thereby forming a fluorine-containing group and forming a fluorine-containing protective layer resistant to aging and corrosion, wherein the gas composition (volume percentage) is nitrogen 70%, bis(3-aminopropyl) polyethylene glycol 2%, amino ether acid 3%, carbon tetrafluoride 5%, nitrogen trifluoride 5%, sulfur hexafluoride 5%, and air 10%.

[0037] (4) The treated transparent substrate film is sent from the oven to the winding mechanism 11.

[0038] (5) PET transparent substrate B side coating treatment: the prepared substrate film B side is treated in the same way as 1), 2) and 3).

[0039] Example 2

[0040] Please refer to Figure 1 and Figure 2 , the present application provides a preparation method of double-sided coating transparent back plate, comprising the steps of:

[0041] (1) PET substrate film single side coating: 280 μm-300 μm PET transparent substrate film is sent from the unwinding mechanism 11 to the coating mechanism 6, fluorine-containing coating liquid is used to coat the PET substrate film A side using a slot coater; the coating layer is a product of copolymerization of one of ethyl methacrylate, butyl acrylate and acrylic acid mono-2-ethylhexyl ester as the main agent and styrene, acrylonitrile or vinyl acetate; at the same time, one or more of tetrafluoroethylene / vinyl ether copolymer, tetrafluoroethylene / vinyl ester copolymer, tetrafluoroethylene / alkyl vinyl ether copolymer, tetrafluoroethylene / alkyl vinyl ester copolymer is added to the solvent; the adhesion strength of the transparent backboard and the protective outer layer is increased, the peeling force is enhanced, and the corrosion resistance and weather resistance are increased to prevent delamination; the production running speed of the coating production line is 40 m / min; the coating includes a main agent and a solvent, and the coating composition includes the following components in the following weight percentages: tetrafluoroethylene / vinyl ester copolymer 30%, tetrafluoroethylene / alkyl vinyl ester copolymer 30%, butyl acetate 30%, and curing agent 10%.

[0042] (2) Coating surface drying operation: the substrate film from the coating head is sent to the oven from the coating mechanism 6, and the coated substrate film is dried; the oven is divided into three sections, the temperature in the oven one 7 is 80°C, the temperature in the oven two 8 is 100°C, and the temperature in the oven three 9 is 110°C. The production running speed of the coating production line is 40 m / min;

[0043] (3) Plasma surface treatment: the substrate film after drying is sent from the oven to the plasma treatment machine 10, and the coating layer surface is treated by plasma grafting; one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis(3-aminopropyl) polyethylene glycol, and amino ether acid gas is mixed into the atmosphere dominated by nitrogen as a dopant gas, thereby forming a fluorine-containing group and forming a fluorine-containing protective layer resistant to aging and corrosion, wherein the gas composition (volume percentage) is nitrogen 65%, bis(3-aminopropyl) polyethylene glycol 5%, amino ether acid 5%, carbon tetrafluoride 5%, nitrogen trifluoride 5%, sulfur hexafluoride 5%, and air 10%.

[0044] (4) The treated transparent substrate film is sent from the oven to the winding mechanism 11.

[0045] (5) PET transparent substrate B side coating treatment: the prepared substrate film B side is treated in the same way as 1), 2) and 3).

[0046] Example 3

[0047] Please refer to Figure 1 and Figure 2 , the present application provides a preparation method of double-sided coating transparent backboard, comprising the steps of:

[0048] (1) PET substrate film single side coating: 280 μm-300 μm PET transparent substrate film is sent from unwinding mechanism 11 to coating mechanism 6, fluorine-containing coating liquid is used to coat PET substrate film A side using a slot coater; the coating layer is a product of copolymerization of one of ethyl methacrylate, butyl acrylate and acrylic acid mono-2-ethylhexyl ester as a main agent and styrene, acrylonitrile or vinyl acetate; one or more of tetrafluoroethylene / vinyl ether copolymer, tetrafluoroethylene / vinyl ester copolymer, tetrafluoroethylene / alkyl vinyl ether copolymer, tetrafluoroethylene / alkyl vinyl ester copolymer is added to the solvent; the adhesion strength of the transparent back plate and the protective outer layer is increased, the peeling force is enhanced, the corrosion resistance and weather resistance are increased, and the delamination phenomenon is prevented; the production running speed of the coating production line is 50 m / min; the coating includes a main agent and a solvent, and the coating composition includes the following components in percentage by weight: tetrafluoroethylene / vinyl ester copolymer 40%, tetrafluoroethylene / alkyl vinyl ester copolymer 25%, butyl acetate 30% and curing agent 5%.

[0049] (2) Coating surface drying operation: the substrate film from the coating head is sent to the oven from the coating mechanism 6, and the coated substrate film is dried; the oven is divided into three sections, the temperature in oven 1 7 is 100°C, the temperature in oven 2 8 is 120°C, and the temperature in oven 3 9 is 130°C. The production running speed of the coating production line is 50 m / min;

[0050] (3) Plasma surface treatment: the dried substrate film is sent from the oven to the plasma treatment machine 10, and the coating layer surface is subjected to plasma grafting treatment; one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis(3-aminopropyl) polyethylene glycol, amino ether acid gas as a dopant gas is mixed into the atmosphere dominated by nitrogen, so as to form a fluorine-containing group and form a fluorine-containing protective layer resistant to aging and corrosion, wherein the gas composition (volume percentage) is nitrogen 85%, bis(3-aminopropyl) polyethylene glycol 1%, amino ether acid 3%, carbon tetrafluoride 4%, nitrogen trifluoride 1%, sulfur hexafluoride 1% and air 5%.

[0051] (4) The treated transparent substrate film is sent from the oven to the winding mechanism 11.

[0052] (5) PET transparent substrate B side coating treatment: the prepared substrate film B side is subjected to the same treatment as 1), 2) and 3).

[0053] The product structure in example 1 to example 3 in the application is as follows Figure 1As shown, from top to bottom, in order: fluorine-containing plasma grafting layer 1, first fluorocarbon coating layer 2, transparent substrate layer 3, second fluorocarbon coating layer 4, fluorine-containing plasma grafting layer 1, the thickness of the transparent substrate layer is 280-300 μm; the thickness of the first fluorocarbon coating layer and the second fluorocarbon coating layer is 6-12 μm, and the thickness of the fluorine plasma grafting layer is 1-4 μm.

[0054] The common polytetrafluoroethylene film-PET substrate film-fluorine-containing coating structure used in the competitor 1, the preparation method of the fluorine-containing coating layer in the competitor 1 is the same as that in the embodiment 1, and the other layer structures are all conventional means. The common fluorine-containing coating layer-PET substrate film-fluorine-containing coating structure used in the competitor 2, the coating solution used in the fluorine-containing coating layer in the competitor 2 includes 40%-70% of fluorocarbon resin, 20%-50% of titanium dioxide, 1%-5% of matting powder, 0.3%-0.8% of polyacrylate, and 5%-15% of isocyanate, wherein the percentages are weight percentages, and the total amount of the fluorocarbon resin, the titanium dioxide, the matting powder, the polyacrylate, and the isocyanate is 100%, and the specific selection is: fluorocarbon resin 60%, titanium dioxide 25%, matting powder 4.5%, polyacrylate 0.5%, and isocyanate 10%, the above components are dissolved in an organic solvent to form a fluorocarbon layer coating solution.

[0055] The coating thicknesses involved in the competitor 1 and the competitor 2 are the same as those in the embodiments 1-3.

[0056] The peel strength of the product manufactured by the application after being pressed with the photovoltaic module POE (D117) film.

[0057] (Test conditions: 120℃, humidity 90%, test time 48h)

[0058] Competitor 1 - D117 Interval Average Force Interval Maximum Force Interval Minimum Force Sample 1 64.6775 85.445 43.91 Sample 2 62.5975 80.432 44.763 Sample 3 59.089 67.885 50.293 Average 62.121 77.921 46.322 Competitor 2 - D117 Interval Average Force Interval Maximum Force Interval Minimum Force Sample 1 49.8235 64.712 34.935 Sample 2 56.7785 72.65 40.907 Sample 3 50.264 69.302 31.226 Average 52.29 68.89 35.69 Example 1 - D117 Interval Average Force Interval Maximum Force Interval Minimum Force 1 119.978 167.126 88.894 2 122.457 189.605 90.321 3 145.332 198.004 92.549 Average 129.256 184.912 90.588 Example 2 - D117 Interval Average Force Interval Maximum Force Interval Minimum Force 1 111.33 158.09 85.612 2 131.4 173.414 81.267 3 138.248 164.754 86.154 Average 126.992 165.419 84.34 Example 3 - D117 Interval Average Force Interval Maximum Force Interval Minimum Force 1 109.196 154.941 84.156 2 112.158 164.82 86.315 3 135.648 186.281 84.962 Average 119.00 168.681 85.144

[0059] The test results of the power decay of the photovoltaic module manufactured by the application after being tested for aging for 1000 hours

[0060]

[0061] The test results of the yellowing of the photovoltaic module manufactured by the application after being tested in water

[0062]

[0063] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary experimental examples, but that the application can be implemented in other concrete forms without departing from the spirit and essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and it is therefore intended that all changes and modifications that fall within the meaning and range of equivalency of the claims be embraced therein, no reference signs in the claims being regarded as limiting the claim concerned.

[0064] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent right scheme, and the description is made in this way only for the sake of clarity, and a person skilled in the art should consider the description as a whole, and the technical schemes in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A method for producing a dual-coated, transparent backsheet, characterized by: The preparation method comprises the following steps: 1) PET substrate film single side coating: sending the PET transparent substrate film from the unwinding mechanism to the coating mechanism, using a slot coater to coat the fluorine coating liquid on the A side of the PET substrate film; 2) Coating surface drying operation: sending the coated substrate film in step 1) from the coating mechanism to the oven, and segmentally drying the coated substrate film; 3) Plasma surface treatment: sending the dried substrate film in step 2) from the oven to the plasma treatment machine, and performing plasma grafting treatment on the coating layer surface; mixing one or more of carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis(3-aminopropyl) polyethylene glycol, and amino ether acid gas as a doped gas in a nitrogen-based atmosphere; 4) Sending the treated transparent substrate film in step 3) from the oven to the winding device; 5) PET transparent substrate B side coating treatment: performing the same treatment as steps 1), 2), and 3) on the prepared substrate film B side, and finally obtaining the double-coated transparent backboard.

2. The method of producing a dual-coated transparent back-sheet for a solar cell module according to claim 1, characterized in that: The fluorine coating liquid in step 1) comprises a main agent and a solvent, and the main agent is a product of copolymerization of one of methyl acrylate, butyl acrylate, and acrylic acid 2-ethylhexyl ester as a main agent with an unsaturated olefin selected from one of styrene, acrylonitrile, or vinyl acetate.

3. A method of making a dual-coated transparent backsheet according to claim 2, characterized in that: The main agent is selected from one or more of tetrafluoroethylene / vinyl ether copolymer, tetrafluoroethylene / vinyl ester copolymer, tetrafluoroethylene / alkyl vinyl ether copolymer, and tetrafluoroethylene / alkyl vinyl ester copolymer.

4. The method of producing a dual-coated transparent back-sheet for a solar cell module according to claim 3, characterized in that: The coating composition comprises the following components in the following weight percentages: tetrafluoroethylene / vinyl ester copolymer 20-40%, tetrafluoroethylene / alkyl vinyl ester copolymer 20-50%, butyl acetate 30-50%, and curing agent 5-10%.

5. The method of producing a dual-coated transparent back-sheet for a solar module according to claim 1, characterized in that: The production running speed of the coating production line in step 2) is 30 m / min-50 m / min.

6. The method of producing a dual-sided coated transparent back-sheet according to claim 1, characterized in that: The oven in step 2) comprises oven one, oven two, and oven three, the temperature in oven one is 80℃-120℃, the temperature in oven two is 100℃-130℃, and the temperature in oven three is 110℃-150℃.

7. The method of producing a dual-sided coated transparent back-sheet according to claim 1, characterized in that: The volume percentage composition of the nitrogen-based atmosphere in step 3) is as follows: nitrogen 65-85%, bis(3-aminopropyl) polyethylene glycol 1-5%, amino ether acid 3-5%, carbon tetrafluoride 4-5%, nitrogen trifluoride 1-5%, sulfur hexafluoride 1-5%, and air 5-10%.

8. A dual-coated, clear backsheet characterized in that: The double-coated transparent backboard is prepared by the preparation method of any one of claims 1-7, and comprises, from top to bottom, a fluorine plasma grafting layer, a first fluorocarbon coating layer, a transparent substrate layer, a second fluorocarbon coating layer, and a fluorine plasma grafting layer.

9. A dual-sided paintable transparent backing sheet according to claim 8, characterized in that: The thickness of the transparent substrate layer is 280~300μm, the thickness of the first fluorocarbon coating layer and the second fluorocarbon coating layer is 6~12μm, and the thickness of the fluorine plasma grafting layer is 1~4μm.

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