阅读说明：本技术 一种氟碳涂布液、一种耐水解的透明氟碳涂层及使用该涂层的太阳能背板 (Fluorocarbon coating liquid, hydrolysis-resistant transparent fluorocarbon coating and solar backboard using coating ) 是由 张彦 汪诚 简伟任 缪锴 夏寅 薛永富 唐海江 李刚 于 2019-07-15 设计创作，主要内容包括：本发明涉及太阳能背板技术领域,具体涉及一种氟碳涂布液,一种耐水解的透明氟碳涂层及使用该涂层的太阳能背板。为了解决现有双面光伏组件中的玻璃背板易脆裂的问题,本发明提供一种氟碳涂布液、一种耐水解的透明氟碳涂层及使用该涂层的太阳能背板。所述氟碳涂布液包含55％～80％的氟碳树脂,1～2％的UV吸收剂,0.5～3％抗水解稳定剂,1％～5％消光粉,0.3％～0.8％的聚丙烯酸酯,10％-20％的附着力促进树脂,和5％～20％的异氰酸酯。本发明提供的氟碳涂布液固化后形成耐水解的透明氟碳涂层。本发明提供的使用前述氟碳涂层的太阳能背板是透明背板,并且具有优秀的耐候(抗UV)性和耐水解性,能代替现有双面光伏组件中的玻璃背板,从根据上解决了现有双面光伏组件中的玻璃背板易脆裂的问题。(The invention relates to the technical field of solar back plates, in particular to a fluorocarbon coating liquid, a hydrolysis-resistant transparent fluorocarbon coating and a solar back plate using the coating. The invention provides a fluorocarbon coating liquid, a hydrolysis-resistant transparent fluorocarbon coating and a solar backboard using the coating, aiming at solving the problem that a glass backboard in the existing double-sided photovoltaic module is easy to crack. The fluorocarbon coating liquid comprises 55-80% of fluorocarbon resin, 1-2% of UV absorbent, 0.5-3% of hydrolysis-resistant stabilizer, 1-5% of matting powder, 0.3-0.8% of polyacrylate, 10-20% of adhesion promoting resin and 5-20% of isocyanate. The fluorocarbon coating liquid provided by the invention forms a hydrolysis-resistant transparent fluorocarbon coating after being cured. The solar backboard using the fluorocarbon coating is a transparent backboard, has excellent weather resistance (UV resistance) and hydrolysis resistance, can replace a glass backboard in the existing double-sided photovoltaic module, and solves the problem that the glass backboard in the existing double-sided photovoltaic module is easy to crack.)

1. The fluorocarbon coating liquid is characterized in that raw materials of the fluorocarbon coating liquid comprise, by weight, 55% -80% of fluorocarbon resin, 1% -2% of UV absorbent, 0.5% -3% of anti-hydrolysis stabilizer, 1% -5% of matting powder, 0.3% -0.8% of polyacrylate, 10% -20% of adhesion promoting resin and 5% -20% of isocyanate; the total amount of the fluorocarbon resin, the UV absorbent, the hydrolysis-resistant stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate is 100 percent.

2. A fluorocarbon coating liquid as claimed in claim 1, wherein said fluorocarbon resin, UV absorber, anti-hydrolysis stabilizer, matting agent, polyacrylate, adhesion promoting resin, and isocyanate are dissolved in organic solvent to prepare fluorocarbon coating liquid, and the solid content of said fluorocarbon coating liquid is 40-60%.

3. A fluorocarbon coating liquid as set forth in claim 1, wherein said fluorocarbon resin is selected from one or a combination of at least two of polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene, polychlorotrifluoroethylene, or polyhexafluoropropylene.

4. A fluorocarbon coating liquid as set forth in claim 1 wherein said UV absorber is a triazine-based UV absorber.

5. A fluorocarbon coating liquid as set forth in claim 1 wherein said hydrolysis resistance agent is polycarbodiimide.

6. A fluorocarbon coating liquid as set forth in claim 1 wherein said adhesion promoting resin is a thermoplastic polyurethane resin.

7. A fluorocarbon coating liquid as set forth in claim 1 wherein said isocyanate is selected from one or a combination of at least two of toluene diisocyanate trimer or multimer, hexamethylene diisocyanate trimer or multimer, or isophorone diisocyanate trimer or multimer.

8. A hydrolysis resistant transparent fluorocarbon coating formed from the fluorocarbon coating solution of any one of claims 1 to 7 after curing.

9. A transparent solar backboard is characterized in that the solar backboard structure sequentially comprises a fluorocarbon coating, a poly (p-xylylene glycol) base material, an adhesive layer and a fluorine film layer; the fluorocarbon coating is formed by curing the fluorocarbon coating liquid as set forth in any one of claims 1 to 7.

10. The solar back sheet according to claim 9, wherein the fluorocarbon coating has a thickness of 10 to 25 μm; the thickness of the base material is 250-300 mu m; the thickness of the adhesive layer is 6-10 mu m; the thickness of the fluorine film layer is 20-25 μm.

Technical Field

The invention relates to the technical field of solar back plates, in particular to a fluorocarbon coating liquid, a hydrolysis-resistant transparent fluorocarbon coating and a solar back plate using the coating.

Background

Solar cells (also referred to as photovoltaic cells, or photovoltaic modules) are currently in unprecedented use and development. Solar cells for double-sided use generally use a back sheet made of glass. And the glass back plate is fragile and inconvenient to carry and install.

It is a problem in the art to provide a new backsheet that can replace glass backsheets.

Disclosure of Invention

The invention provides a fluorocarbon coating liquid, a hydrolysis-resistant transparent fluorocarbon coating and a solar backboard using the coating, aiming at solving the problem that a glass backboard in the existing double-sided photovoltaic module is easy to crack. The fluorocarbon coating liquid provided by the invention forms a hydrolysis-resistant transparent fluorocarbon coating after being cured, and the transparent fluorocarbon coating has weather resistance and hydrolysis resistance. The solar backboard using the transparent fluorocarbon coating is a transparent backboard, has excellent weather resistance (UV resistance) and hydrolysis resistance, can replace a glass backboard in the existing double-sided photovoltaic module, and solves the problem that the glass backboard in the existing double-sided photovoltaic module is easy to crack.

The transparent back plate can replace a glass back plate, can be applied to auxiliary materials in double-sided photovoltaic power generation assemblies, and has important significance for production of corresponding high-power photovoltaic assemblies. Compared with the traditional double-sided glass assembly, the transparent back plate can reduce the weight of the assembly, and is convenient to carry and install; the method can be unified with the laminating process of the conventional common single-sided assembly, so that the glass embrittlement risk is reduced; in the lamination process, the risk of subfissure of the battery silicon wafer is reduced.

Since the glass has obvious advantage in the aspect of aging resistance, the key point of developing the transparent back plate is to comprehensively evaluate the hydrolysis resistance and the UV resistance of the glass to meet the requirement of outdoor use for more than 25 years, so that the transparent back plate has more market competitiveness and universality and is considered to be applied to double-sided power generation components by more component factories. Aiming at the hydrolysis resistance, a proper hydrolysis resistance agent is selected, so that the transparent coating can be more endurable in high humidity and heat conditions, and the final outdoor long-term stable use target can be achieved.

In order to achieve the above object, the present invention adopts the following technical solutions.

The invention provides a fluorocarbon coating liquid, which comprises the following raw materials, by weight, 55% -80% of fluorocarbon resin, 1% -2% of UV (ultraviolet) absorbent, 0.5% -3% of anti-hydrolysis stabilizer, 1% -5% of matting powder, 0.3% -0.8% of polyacrylate, 10% -20% of adhesion promoting resin and 5% -20% of isocyanate; the total amount of the fluorocarbon resin, the UV absorbent, the hydrolysis-resistant stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate is 100 percent. Dissolving the fluorocarbon resin, the UV absorbent, the anti-hydrolysis stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate in an organic solvent to prepare the fluorocarbon coating liquid, wherein the solid content of the fluorocarbon coating liquid is 40-60%.

The fluorocarbon coating liquid is also called fluorocarbon coating.

The components of the fluorocarbon coating liquid are limited in the content range, so that the fluorocarbon resin can initially react at high temperature, and then is cured at 50 ℃ for 48 hours to form a high-density transparent fluorocarbon coating on the surface of the PET substrate, the transparent fluorocarbon coating can show excellent packaging strength in the lamination process with EVA, the high packaging strength can be still maintained after the transparent fluorocarbon coating is subjected to a damp-heat aging test, and appearance change is avoided after QUV treatment.

The proportion of the fluorocarbon coating liquid is limited in the range, and the fluorocarbon coating liquid and the corresponding solar backboard have better control properties on hydrolysis resistance and UV resistance after curing is finished, so that the final solar backboard product can meet the quality requirements of the transparent photovoltaic module (the light transmittance is greater than 85%, the initial packaging strength is greater than 40N, the appearance of the transparent photovoltaic module is not problematic (shown by an adhesive force test result, the fluorocarbon coating does not fall off), the packaging strength is greater than 20N, the ultraviolet aging is not carried out for 120kwh, and the appearance is not obviously changed).

Further, the solid content of the fluorocarbon coating liquid is preferably 45% to 54%.

The solid content of the fluorocarbon coating liquid is limited in the range, so that the fluorocarbon coating liquid can be uniformly coated on the surface of the base material.

Further, the fluorocarbon resin is selected from one or a combination of at least two of polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene, polychlorotrifluoroethylene and polyhexafluoropropylene.

The fluorocarbon resin can realize the characteristic of weather resistance (UV resistance) by utilizing the characteristic of high bond energy of fluorine-carbon bonds.

Further, the fluorocarbon resin is a thermosetting resin.

The fluorocarbon resin is provided by a bulk metalworking.

Further, the UV absorber is a triazine-based UV absorber, and has excellent performance in UV resistance (UV resistance).

Further, the UV absorber is supplied by basf, germany.

Further, the hydrolysis resistance agent is of a polycarbodiimide type, and can promote the wet heat resistance of the coating.

Further, the hydrolysis resistant agent is provided by Raschig company in Germany.

Further, the matting powder is silica particles.

Further, the silica particles are provided by Grace.

Further, polyacrylate is used to modify fluorocarbon resins. The polyacrylate is mainly used for regulating and controlling the bonding force of the fluorocarbon coating after weather resistance.

The polyacrylate is available from Pickering chemistry.

Furthermore, the adhesion promoting resin is thermoplastic polyurethane resin, and can further participate in reaction bonding with the EVA surface in the high-temperature lamination process to form high packaging strength.

The thermoplastic polyurethane resin is provided by Daba chemistry.

Further, the curing agent species is of the isocyanate type.

Further, the isocyanate is selected from one or a combination of at least two of toluene diisocyanate trimer or polymer, hexamethylene diisocyanate trimer or polymer, or isophorone diisocyanate trimer or polymer.

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 61-80% of fluorocarbon resin, 1.1-1.7% of UV absorbent, 0.5-1.2% of hydrolysis resistant agent, 1-4% of matting powder, 0.3-0.6% of polyacrylate, 10-16% of adhesion promoting resin and 5-20% of isocyanate; the total amount of the fluorocarbon resin, the UV absorbent, the hydrolysis-resistant stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate is 100 percent. Dissolving the fluorocarbon resin, the UV absorbent, the anti-hydrolysis stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate in an organic solvent to prepare a fluorocarbon coating liquid, wherein the solid content of the fluorocarbon coating liquid is 40-58%, and the technical scheme comprises the following steps of 2-3, 5 and 7-9.

Further, the paint comprises 63.6-67% of fluorocarbon resin, 1.3-1.7% of UV absorbent, 0.8-1.2% of hydrolysis-resistant stabilizer (short for hydrolysis-resistant agent), 2-4% of matting powder, 0.5-0.6% of polyacrylate, 14-16% of adhesion promoting resin and 13-14.9% of isocyanate according to weight percentage; the total amount of the fluorocarbon resin, the UV absorbent, the hydrolysis-resistant stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate is 100 percent. Dissolving the fluorocarbon resin, the UV absorbent, the anti-hydrolysis stabilizer, the matting powder, the polyacrylate, the adhesion promoting resin and the isocyanate in an organic solvent to prepare a fluorocarbon coating liquid, wherein the solid content of the fluorocarbon coating liquid is 45-54 percent, and the technical scheme comprises the following steps of examples 2, 3 and 7.

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 hydrolysis-resistant transparent fluorocarbon coating which is formed by curing the fluorocarbon coating liquid.

The invention also provides a transparent solar backboard, which sequentially comprises a fluorocarbon coating, a base material, a bonding glue layer and a fluorine film layer. The fluorocarbon coating is formed by curing the fluorocarbon coating liquid provided by the invention. The fluorocarbon coating comprises fluorocarbon resin, a UV absorbent, an anti-hydrolysis agent, matting powder, polyacrylate, thermoplastic polyurethane resin and isocyanate.

Further, the base material is a transparent base material, and the material of the base material layer is selected from poly (p-xylylene glycol) (PET).

Furthermore, the adhesive layer is formed by an adhesive, and the adhesive is a polyester adhesive.

Further, the fluorine film is a transparent PVF film or PVDF film.

Further, the thickness of the fluorocarbon coating is 10-25 μm; the thickness of the base material layer is 250-300 mu m; the thickness of the adhesive layer is 6-10 mu m; the thickness of the fluorine film layer is 20-25 μm.

Furthermore, the thickness of the adhesive layer is 6-8 μm.

Furthermore, the thickness of the base material layer is 250-275 mu m.

Further, the thickness of the fluorocarbon coating is preferably 10-17 μm.

Further, the thickness of the fluorocarbon coating is preferably 15-17 μm.

The transparent solar backboard provided by the invention can be used as an outermost backboard packaging material of a photovoltaic module.

The preparation method of the solar backboard provided by the invention comprises the following steps:

coating the fluorocarbon coating liquid on the surface of a base material, and placing the base material in a circulating oven for thermosetting treatment to form a fluorocarbon coating; then coating adhesive on the other surface of the substrate to form a bonding adhesive layer, placing the bonding adhesive layer in a circulating oven for drying, and bonding a fluorine film layer; finally, carrying out primary curing reaction.

Further, the temperature of the circulating oven drying is 150 ℃ and the time is 2 minutes.

Furthermore, the drying temperature of the adhesive layer is 90 ℃ and the time is 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 Ningbering corporation. 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.

The above preparation method further includes a step of preparing the fluorocarbon coating liquid before coating the fluorocarbon coating liquid on the surface of the substrate.

The fluorocarbon resin and the hydrolysis resistant agent in the fluorocarbon coating liquid have important influence on the wet and heat aging resistance, and the added adhesion promoter thermoplastic polyurethane can further enhance the bonding capacity with EVA in the lamination high-temperature process.

The fluorocarbon coating provided by the invention realizes the following technical effects:

1. after the fluorocarbon coating liquid is solidified into the fluorocarbon coating, the aging resistance and the high packaging strength can be realized

The inner layer material of the solar back panel.

2. Solidifying the fluorocarbon coating liquid into a fluorocarbon coating, and then bonding the fluorocarbon coating liquid with a proper fluorine film to obtain the sun

The energy backboard and the solar backboard can realize high light transmittance and super-strong damp-heat resistance.

Compared with the glass back plate in the existing double-sided photovoltaic module, the transparent solar back plate provided by the invention has the advantages of good flexibility and strength, difficulty in brittle fracture, high light transmittance, excellent weather resistance and hydrolysis resistance, light weight, convenience in carrying and installation and capability of replacing the glass back plate to be applied to the double-sided photovoltaic module due to the adoption of the high polymer material.

Drawings

Fig. 1 is a schematic structural diagram of a solar back sheet provided by the present invention.

Wherein the above figures include the following reference numerals:

10. a fluorine film layer; 20. gluing a glue layer; 30. a substrate layer; 40. a fluorocarbon coating.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The preparation method of the solar back panel film provided by the embodiment of the invention comprises the following steps:

(1) coating the fluorocarbon coating liquid on the surface of a base material, and placing the base material in a circulating oven for curing treatment to form a fluorocarbon coating; (2) coating an adhesive on the other side of the semi-finished product substrate coated with the fluorocarbon coating to form a bonding adhesive layer, placing the bonding adhesive layer in a circulating oven for drying treatment, and then compounding a fluorine film layer; (3) curing and reacting the solar backboard finished product; (4) and laminating the solar backboard and the EVA to prepare a simulation test packaging strength.

Further, (1) the temperature of the drying of a circulating oven for fluorocarbon coating treatment in the process is 150 ℃, and the time is 2 minutes;

further, (2) the temperature of a circulating oven for drying the adhesive in the process is 90 ℃, and the time is 2 minutes;

further, the aging treatment temperature in the process (3) was 50 ℃ for 48 hours.

Further, the lamination parameters of the (4) 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 corporation.

Further, the substrate selected was a model KP20 substrate available from Ningbering corporation. The substrate is also referred to as a PET substrate.

The above preparation method further includes a step of disposing the fluorocarbon layer coating liquid before coating the fluorocarbon coating liquid on the surface of the substrate.

The transparent 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 coating to the substrate was tested according to the standard of GB 1720-1979 "paint adhesion test", wherein 100/100 represents no release and 90/100 represents 10% release.

Testing the packaging strength: and testing the bonding strength of the fluorocarbon coating and the EVA according to the standard of GB/T31034-. The higher the value of the peel force (N), the higher the adhesive strength.

QUV aging treatment: treating the silicon solar cell module by using an ultraviolet aging lamp according to the standard of GB/T31034-. The appearance is not obviously changed, and the UV resistance is qualified.

Light transmittance: the total light transmittance of the solar back sheet is tested according to the standard of JISK7105-1981, test method for plastic optical performance.

And (3) wet heat aging treatment: according to the standard of GB/T31034-. Compared with the glass back plate, the transparent solar back plate provided by the invention has weather resistance, so that a more durable 3000h test is adopted.

The fluorocarbon coating liquid and fluorocarbon coating layer provided by the present invention will be further described with reference to the following examples.