Photovoltaic backboard film EB curing coating as well as preparation method and coating method thereof

Abstract

The invention discloses a photovoltaic backboard film EB curing coating as well as a preparation method and a coating method thereof, and relates to the technical field of coatings. 25% of aliphatic polyurethane acrylic resin; 15% of a multifunctional active monomer; 15% of a monofunctional active monomer; 0.3% of a leveling agent; the EB curing coating is prepared by the following steps: adding 0.2% of a defoaming agent into a reaction kettle, enabling the reaction kettle to be in a sealed and dust-free state, keeping the internal vacuum degree of the reaction kettle to be-0.1 MPa to-1 MPa, mixing and stirring for 20-40 minutes, and then standing and cooling for more than 30 minutes, thereby obtaining the EB curing coating. Then coating a photovoltaic PET (polyethylene terephthalate) film with the EB curing coating for the photovoltaic backboard film, and then carrying out EB curing, inspection, re-coating of unqualified films and process processing to obtain the photovoltaic backboard film.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to an EB-cured coating for a photovoltaic backplane film and a preparation method and a coating method thereof. Background Art

[0002] Photovoltaic power generation is an important part of clean energy and has developed rapidly. As an important part of photovoltaic modules, photovoltaic backplane film is not only required to have high waterproof, weather-resistant, and insulating properties, but also requires an efficient, low-cost, and environmentally friendly preparation process. There are three common processes for traditional photovoltaic backplane films. The first is the direct composite method, which composites two PVDF films onto a PET film substrate; the second is the coating method, which coats a fluoride solution onto a PET film; and the third is the cross-linking reaction method, which reacts fluoride and PET film together through a cross-linking agent to form a mesh-like overall structure. Among them, the direct composite method has a complex process and high cost; and the coating method and the cross-linking reaction method have some disadvantages in the preparation process, such as a long baking process and the use of hazardous chemicals, which affect production efficiency and environmental friendliness. Therefore, it is imperative to develop an efficient and environmentally friendly photovoltaic backplane film coating preparation process. Summary of the invention

[0003] The purpose of the present invention is to provide a photovoltaic backplane film EB-curing coating and a preparation method and a coating method thereof, aiming to solve the above-mentioned technical problems. The present invention mainly provides an EB-curing coating with excellent waterproof, weather-resistant, insulating and other properties, and then coats the above-mentioned EB-curing coating on a photovoltaic PET film, performs EB curing - inspection - recoating the unqualified ones - process - to obtain a photovoltaic backplane film.

[0004] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0005] A photovoltaic back plate film EB curing coating comprises the following components in weight percentage: 30-50% polycarbonate acrylic resin; 10-30% aliphatic polyurethane acrylic resin; 10-20% multifunctional active monomer; 10-20% monofunctional active monomer; 0.1-0.5% leveling agent; and 0.1-0.5% defoaming agent.

[0006] Preferably, the composition comprises the following components in weight percentage: 45% polycarbonate acrylic resin; 25% aliphatic polyurethane acrylic resin; 15% multifunctional active monomer; 15% monofunctional active monomer; 0.3% leveling agent; and 0.2% defoaming agent.

[0007] Preferably, the leveling agent is one or more of BYK-333, BYK-354, BYK-355, BYK-380, and BYK-390.

[0008] Preferably, the defoaming agent is one or more of BYK-065, BYK-066, BYK-070, and BYK-088.

[0009] A method for preparing the EB-cured coating for the photovoltaic backplane film described in any of the above items comprises the following steps: adding the weight portions of polycarbonate acrylic resin, aliphatic polyurethane acrylic resin, multifunctional active monomer, monofunctional active monomer, leveling agent and defoaming agent into a reactor, mixing and stirring for 20-40 minutes, and then standing and cooling for more than 30 minutes to obtain the EB-cured coating.

[0010] Preferably, the reactor is a sealed reactor with a dust-free interior and a vacuum degree of -0.1 MPa to -1 MPa.

[0011] A coating method for the photovoltaic backplane film EB curing coating as described in any one of the above items comprises the following steps:

[0012] Step 1: Load the photovoltaic backsheet PET film to the production line and inspect it one by one, keep the qualified photovoltaic backsheet PET film, and remove the unqualified photovoltaic backsheet PET film;

[0013] Step 2: Clean the qualified photovoltaic backplane PET film in step 1 by roller coating with an environmentally friendly solvent, using a sponge roller for roller coating;

[0014] Step 3: performing hot air drying on the surface of the board treated in step 2;

[0015] Step 4: Roller-coat the above EB curing coating on the basis of step 3, with a coating amount of 6-10g / m 2 ;

[0016] Step 5: EB-curing the photovoltaic backplane PET film coated with the EB-curing coating in step 4 to obtain a photovoltaic backplane PET backplane film;

[0017] Step 6: Check the board surface effect in step 5 online to check the flatness and defects of the board surface, and classify them into qualified and unqualified products;

[0018] Step 7: The qualified photovoltaic backplane PET backplane film in step 6 is stored in the corresponding storage location and work station;

[0019] Step 8: The photovoltaic backplane PET backplane film stored in step 7 is processed by corresponding processes, such as cutting, shaping, etc., to obtain the final photovoltaic backplane film.

[0020] Preferably, step 4 is replaced by: on the basis of step 3, the EB curing coating is applied by roller coating once, and the coating amount of the roller coating once is 8-10 g / m 2After the first roller coating is completed, the EB curing coating is continuously applied for the second time. The coating amount of the second roller coating is 18-20g / m 2 The total coating amount of two roller coatings is 28-32g / m 2 .

[0021] Preferably, replace step 4: on the basis of step 3, the above-mentioned EB curing coating is applied by roller coating once, and the solvent-free reciprocating spraying operation is performed by heating the original paint liquid, and the coating amount is 60-80g / m 2 ; After the above coating is completed, use infrared lamp to heat and level, the temperature is controlled at 40±5℃, and the leveling time is 8-10 minutes.

[0022] Preferably, the EB curing parameter values ​​in step 5 are as follows:

[0023] Project Parameters Numeric Electron beam current 100mA dose 70kGy Scan speed 3000Hz / S Curing environment 99.99% nitrogen atmosphere Electron beam energy 150KeV Coating amount 20g / m2 Line speed 40m / min .

[0024] The photovoltaic backsheet film EB curing coating and the preparation method and coating method thereof of the present invention have the following beneficial effects:

[0025] 1. The photovoltaic backsheet film EB-cured coating of the present invention adopts polycarbonate acrylic resin and aliphatic polyurethane acrylic resin as main raw materials, which provides a stable coating formula for the present invention and enables the EB-cured coating of the present invention to have excellent waterproof, weather-resistant, insulating and other properties;

[0026] 2. The coating method of the photovoltaic backplane film EB curing coating of the present invention uses electron beam (EB) technology for curing, which is fast and efficient, saving time and energy consumption;

[0027] 3. The coating method of the photovoltaic backplane film EB curing coating of the present invention does not require the traditional long-term baking process, thus reducing the production cycle;

[0028] 4. The coating method of the photovoltaic backplane film EB curing coating of the present invention does not use hazardous chemicals and is environmentally friendly. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the product of the present invention is further described in detail below in conjunction with embodiments.

[0030] It should be noted that all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] A photovoltaic backplane film EB curing coating comprises the following components in weight percentage: 30-50% polycarbonate acrylic resin; 10-30% aliphatic polyurethane acrylic resin; 10-20% multifunctional active monomer; 10-20% monofunctional active monomer; 0.1-0.5% leveling agent; 0.1-0.5% defoaming agent. The leveling agent is one or more of BYK-333, BYK-354, BYK-355, BYK-380, BYK-390. The defoaming agent is one or more of BYK-065, BYK-066, BYK-070, BYK-088.

[0032] It should be noted that: the polycarbonate acrylic resin has a transparency that exceeds that of glass, with a light transmittance of 94%, and also has excellent weather resistance, and has good resistance to weather conditions such as sunlight, wind, rain, and snow, and is suitable for signs and building materials. The durability of the polycarbonate acrylic resin is about 10 to 20 years, it is not easy to break, and has excellent impact resistance; the aliphatic polyurethane acrylic resin has excellent weather resistance, good decorative properties, high wear resistance, chemical resistance, and excellent construction performance; the two are used as the main raw materials of the photovoltaic backplane film EB-cured coating of the present invention, so that the photovoltaic backplane film EB-cured coating of the present invention has good waterproof, weather-resistant, insulating and other properties; in the present invention, the multifunctional active monomer contains 2 or more photoactive groups, and these groups can quickly participate in the reaction in the photocuring system, thereby accelerating the curing process, so that the present invention can be The EB curing coating of the invention can effectively accelerate the curing speed in the curing step of the coating process; the low volatility of the multifunctional active monomer is used to help reduce the material loss of the curing coating of the invention during the curing process and improve the utilization efficiency of the material; the multifunctional active monomer is used to form a cross-linked network, which can significantly improve the mechanical strength, chemical resistance and thermal stability of the cured film formed by the invention; each molecule of the monofunctional active monomer contains only one group that can participate in the curing reaction, so that in the curing process of the invention, these groups almost all participate in the reaction, thereby effectively improving the conversion rate of the invention; in the present invention, the reasonable configuration of the multifunctional active monomer and the monofunctional active monomer is used, so that the EB curing coating of the invention has the characteristics of rapid curing, reduced material loss, improved mechanical strength, chemical resistance and thermal stability of the cured film, and improved conversion rate. The use of the leveling agent can effectively ensure that the EB curing coating has good fluidity and avoids the problem of not being able to be well coated during use; the use of the defoaming agent can effectively ensure that the EB curing coating will not have bubble problems during preparation and use.

[0033] Example 1

[0034] The photovoltaic backplane film EB curing coating and its preparation method include the following steps: adding 32% polycarbonate acrylic resin; 36% aliphatic polyurethane acrylic resin; 8.6% multifunctional active monomer; 22.5% monofunctional active monomer; 0.3% leveling agent; 0.6% defoaming agent into a reactor, making the reactor in a sealed dust-free state and keeping its internal vacuum degree between -0.1MPa and -1MPa, mixing and stirring for 20-40min, and then standing and cooling for more than 30min to obtain the EB curing coating.

[0035] Example 2

[0036] The photovoltaic backplane film EB curing coating and its preparation method include the following steps: adding 40% polycarbonate acrylic resin; 28% aliphatic polyurethane acrylic resin; 12% multifunctional active monomer; 19% monofunctional active monomer; 0.5% leveling agent; 0.5% defoaming agent into a reactor, making the reactor in a sealed dust-free state and keeping its internal vacuum degree between -0.1MPa and -1MPa, mixing and stirring for 20-40min, and then standing and cooling for more than 30min to obtain the EB curing coating.

[0037] Example 3

[0038] The photovoltaic backplane film EB curing coating and its preparation method include the following steps: adding 44.5% polycarbonate acrylic resin; 25% aliphatic polyurethane acrylic resin; 15% multifunctional active monomer; 15% monofunctional active monomer; 0.3% leveling agent; 0.2% defoaming agent into a reactor, so that the reactor is in a sealed dust-free state and its internal vacuum degree is maintained between -0.1MPa and -1MPa, mixing and stirring for 20-40min, and then standing and cooling for more than 30min to obtain the EB curing coating.

[0039] Example 4

[0040] The photovoltaic backplane film EB curing coating and its preparation method include the following steps: adding 50% polycarbonate acrylic resin; 21.5% aliphatic polyurethane acrylic resin; 18% multifunctional active monomer; 10% monofunctional active monomer; 0.3% leveling agent; 0.2% defoaming agent into a reactor, making the reactor in a sealed dust-free state and keeping its internal vacuum degree between -0.1MPa and -1MPa, mixing and stirring for 20-40min, and then standing and cooling for more than 30min to obtain the EB curing coating.

[0041] Example 5

[0042] The photovoltaic backplane film EB curing coating and its preparation method include the following steps: adding 56% polycarbonate acrylic resin; 12% aliphatic polyurethane acrylic resin; 22% multifunctional active monomer; 9.5% monofunctional active monomer; 0.3% leveling agent; 0.2% defoaming agent into a reactor, making the reactor in a sealed dust-free state and keeping its internal vacuum degree between -0.1MPa and -1MPa, mixing and stirring for 20-40min, and then standing and cooling for more than 30min to obtain the EB curing coating.

[0043] Comparative Example 1

[0044] The difference between this comparative example and Example 3 is that an equal amount of common commercially available polyurethane acrylate is used to replace the polycarbonate acrylate resin in Example 3, and the other raw material configurations and methods are the same to prepare the cured coating.

[0045] Comparative Example 2

[0046] The difference between this comparative example and Example 3 is that an equal amount of common commercially available polyurethane acrylate is used to replace the aliphatic polyurethane acrylate resin in Example 3, and the other raw material configurations and methods are the same to prepare the cured coating.

[0047] Comparative Example 3

[0048] The difference between this comparative example and Example 3 is that no multifunctional active monomer is added, and the other raw material configurations and methods are the same to prepare the cured coating.

[0049] Comparative Example 4

[0050] The difference between this comparative example and Example 3 is that no monofunctional active monomer is added, and the other raw material configurations and methods are the same to prepare the cured coating.

[0051] The cured coatings in Examples 1-5 and Comparative Examples 1-4 were applied to a photovoltaic backplane PET film and subjected to performance tests, wherein the surface hardness was tested according to GB / T 6739-2006 "Determination of film hardness by pencil method for paints and varnishes"; the adhesion was tested according to GB / T5210-2006 "Adhesion test for paints and varnishes by pull-off method", and the results are shown in Table 1:

[0052]

[0053] The performance indicators of the photovoltaic backsheet film EB curing coatings of Examples 1-5 of the present invention are as follows in Table 2:

[0054]

[0055] From Table 1 and Table 2 above, it can be seen that the photovoltaic backplane film EB cured coating prepared in Examples 1-5 has excellent waterproof, weather resistance, yellowing resistance and other advantages. During the curing process, the curing rate of the coating is high, the transparency can still be maintained at the original level, and it has good surface hardness and adhesion. From the results of Example 3 and Comparative Examples 1-4, it can be seen that the polycarbonate acrylic resin, aliphatic polyurethane acrylic resin, multifunctional active monomer, and monofunctional active monomer can promote each other synergistically, and compared with using them alone or separately, all aspects of performance can achieve a significant improvement effect. Implementation 1:

[0056] A method for coating a photovoltaic backplane film EB curing coating comprises the following steps:

[0057] Step 1: Load the photovoltaic backsheet PET film to the production line and inspect it one by one, keep the qualified photovoltaic backsheet PET film, and remove the unqualified photovoltaic backsheet PET film;

[0058] Step 2: Clean the qualified photovoltaic backplane PET film in step 1 by roller coating with an environmentally friendly solvent, using a sponge roller for roller coating;

[0059] Step 3: performing hot air drying on the surface of the board treated in step 2;

[0060] Step 4: Roller-coat the above EB curing coating on the basis of step 3, with a coating amount of 6-10g / m 2 ;

[0061] Step 5: EB-curing the photovoltaic backplane PET film coated with EB curing coating in step 4 to obtain a photovoltaic backplane PET backplane film; the relevant parameters in the EB curing process are as follows:

[0062] Project Parameters Numeric Electron beam current 100mA dose 70kGy Scan speed 3000Hz / S Curing environment 99.99% nitrogen atmosphere Electron beam energy 150KeV Coating amount 20g / m2 Line speed 40m / min

[0063] Step 6: Check the board surface effect in step 5 online to check the flatness and defects of the board surface, and classify them into qualified and unqualified products;

[0064] Step 7: The qualified photovoltaic backplane PET backplane film in step 6 is stored in the corresponding storage location and work station;

[0065] Step 8: The photovoltaic backplane PET backplane film stored in step 7 is processed by corresponding processes, such as cutting, shaping, etc., to obtain the final photovoltaic backplane film.

[0066] Implementation 2:

[0067] A method for coating a photovoltaic backplane film EB curing coating comprises the following steps:

[0068] Step 1: Load the photovoltaic backsheet PET film to the production line and inspect it one by one, keep the qualified photovoltaic backsheet PET film, and remove the unqualified photovoltaic backsheet PET film;

[0069] Step 2: Clean the qualified photovoltaic backplane PET film in step 1 by roller coating with an environmentally friendly solvent, using a sponge roller for roller coating;

[0070] Step 3: performing hot air drying on the surface of the board treated in step 2;

[0071] Step 4: Based on step 3, apply the above EB curing coating with a roller coating. The coating amount of the roller coating is 8-10g / m 2 After the first roller coating is completed, the EB curing coating is continuously applied for the second time. The coating amount of the second roller coating is 18-20g / m 2 The total coating amount of two roller coatings is 28-32g / m 2 ;

[0072] Step 5: EB-curing the photovoltaic backplane PET film coated with EB curing coating in step 4 to obtain a photovoltaic backplane PET backplane film; the relevant parameters in the EB curing process are as follows:

[0073] Project Parameters Numeric Electron beam current 100mA dose 70kGy Scan speed 3000Hz / S Curing environment 99.99% nitrogen atmosphere Electron beam energy 150KeV Coating amount 20g / m2 Line speed 40m / min

[0074] Step 6: Check the board surface effect in step 5 online to check the flatness and defects of the board surface, and classify them into qualified and unqualified products;

[0075] Step 7: The qualified photovoltaic backplane PET backplane film in step 6 is stored in the corresponding storage location and work station;

[0076] Step 8: The photovoltaic backplane PET backplane film stored in step 7 is processed by corresponding processes, such as cutting, shaping, etc., to obtain the final photovoltaic backplane film.

[0077] Implementation three:

[0078] A method for coating a photovoltaic backplane film EB curing coating comprises the following steps:

[0079] Step 1: Load the photovoltaic backsheet PET film to the production line and inspect it one by one, keep the qualified photovoltaic backsheet PET film, and remove the unqualified photovoltaic backsheet PET film;

[0080] Step 2: Clean the qualified photovoltaic backplane PET film in step 1 by roller coating with an environmentally friendly solvent, using a sponge roller for roller coating;

[0081] Step 3: performing hot air drying on the surface of the board treated in step 2;

[0082] Step 4: Based on step 3, the above EB curing coating is applied by roller coating, and the solvent-free reciprocating spraying operation is performed by heating the original paint liquid, and the coating amount is 60-80g / m 2 ; After the above coating is completed, infrared lamp is used for heating and leveling, the temperature is controlled at 40±5℃, and the leveling time is 8-10 minutes;

[0083] Step 5: EB-curing the photovoltaic backplane PET film coated with EB curing coating in step 4 to obtain a photovoltaic backplane PET backplane film; the relevant parameters in the EB curing process are as follows:

[0084] Project Parameters Numeric Electron beam current 100mA dose 70kGy Scan speed 3000Hz / S Curing environment 99.99% nitrogen atmosphere Electron beam energy 150KeV Coating amount 20g / m2 Line speed 40m / min

[0085] Step 6: Check the board surface effect in step 5 online to check the flatness and defects of the board surface, and classify them into qualified and unqualified products;

[0086] Step 7: The qualified photovoltaic backplane PET backplane film in step 6 is stored in the corresponding storage location and work station;

[0087] Step 8: The photovoltaic backplane PET backplane film stored in step 7 is processed by corresponding processes, such as cutting, shaping, etc., to obtain the final photovoltaic backplane film.

[0088] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention still belong to the present invention.

Claims

1. A photovoltaic backplane film EB curing coating, characterized in that: The invention comprises the following components in weight percentage: 30-50% of polycarbonate acrylic resin; 10-30% of aliphatic polyurethane acrylic resin; 10-20% of multifunctional active monomer; 10-20% of monofunctional active monomer; 0.1-0.5% of leveling agent; and 0.1-0.5% of defoaming agent.

2. The photovoltaic backsheet film EB curing coating according to claim 1, characterized in that: The invention comprises the following components in weight percentage: 45% of polycarbonate acrylic resin; 25% of aliphatic polyurethane acrylic resin; 15% of multifunctional active monomer; 15% of monofunctional active monomer; 0.3% of leveling agent; and 0.2% of defoaming agent.

3. The photovoltaic backsheet film EB curing coating according to claim 2, characterized in that: The leveling agent is one or more of BYK-333, BYK-354, BYK-355, BYK-380, and BYK-390.

4. The photovoltaic backsheet film EB curing coating according to claim 3, characterized in that: The defoaming agent is one or more of BYK-065, BYK-066, BYK-070 and BYK-088.

5. A method for preparing the photovoltaic backsheet film EB curing coating according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: adding the weight portions of polycarbonate acrylic resin, aliphatic polyurethane acrylic resin, multifunctional active monomer, monofunctional active monomer, leveling agent and defoaming agent into a reaction kettle, mixing and stirring for 20-40 minutes, and then standing and cooling for more than 30 minutes to obtain EB curing coating.

6. The method for preparing the photovoltaic backplane film EB curing coating according to claim 5, characterized in that: The reactor is a sealed reactor with no dust inside and a vacuum degree of -0.1 MPa to -1 MPa.

7. A coating method for the photovoltaic backsheet film EB curing coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Load the photovoltaic backsheet PET film to the production line and inspect it one by one, keep the qualified photovoltaic backsheet PET film, and remove the unqualified photovoltaic backsheet PET film; Step 2: Clean the qualified photovoltaic backplane PET film in step 1 by roller coating with an environmentally friendly solvent, using a sponge roller for roller coating; Step 3: performing hot air drying on the surface of the board treated in step 2; Step 4: Roller-coat the above EB curing coating on the basis of step 3, with a coating amount of 6-10g / m 2 ; Step 5: EB-curing the photovoltaic backplane PET film coated with the EB-curing coating in step 4 to obtain a photovoltaic backplane PET backplane film; Step 6: Check the board surface effect in step 5 online to check the flatness and defects of the board surface, and classify them into qualified and unqualified products; Step 7: The qualified photovoltaic backplane PET backplane film in step 6 is stored in the corresponding storage location and work station; Step 8: The photovoltaic backplane PET backplane film stored in step 7 is processed by corresponding processes, such as cutting, shaping, etc., to obtain the final photovoltaic backplane film.

8. The coating method of the photovoltaic backsheet film EB curing coating according to claim 7 is characterized in that: Replacement step 4: Based on step 3, apply the above EB curing coating with a roller coating, and the coating amount of the roller coating is 8-10g / m 2 After the first roller coating is completed, the EB curing coating is continuously applied for the second time. The coating amount of the second roller coating is 18-20g / m 2 The total coating amount of two roller coatings is 28-32g / m 2 .

9. The coating method of the photovoltaic backsheet film EB curing coating according to claim 7, characterized in that: Replacement step 4: On the basis of step 3, the above EB curing coating is applied by roller coating, and the solvent-free reciprocating spraying operation is performed by heating the original paint liquid, and the coating amount is 60-80g / m 2 ; After the above coating is completed, use infrared lamp to heat and level, the temperature is controlled at 40±5℃, and the leveling time is 8-10 minutes.

10. The coating method of the photovoltaic backsheet film EB curing coating according to any one of claims 7 to 9, characterized in that: The EB curing parameter values ​​in step 5 are as follows: 。

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