CN113637204B - Solar cell back film - Google Patents
Solar cell back film Download PDFInfo
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- CN113637204B CN113637204B CN202110912733.2A CN202110912733A CN113637204B CN 113637204 B CN113637204 B CN 113637204B CN 202110912733 A CN202110912733 A CN 202110912733A CN 113637204 B CN113637204 B CN 113637204B
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- 239000002113 nanodiamond Substances 0.000 claims abstract description 76
- 238000000576 coating method Methods 0.000 claims abstract description 63
- 239000011248 coating agent Substances 0.000 claims abstract description 61
- 229920000642 polymer Polymers 0.000 claims abstract description 44
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 39
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000012767 functional filler Substances 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 13
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- 239000000463 material Substances 0.000 claims description 7
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 6
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 3
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 239000002803 fossil fuel Substances 0.000 description 1
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- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
-
- 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
-
- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of 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; Derivatives of such polymers
- C08J2427/02—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The application discloses solar cell back film, including the PET substrate layer and set up the resistant coating of waiting in at least one side of PET substrate layer, resistant coating of waiting includes fluorocarbon resin and the functional filler of dispersion in fluorocarbon resin, and the functional filler includes polymer cladding nano diamond and surface modification nanometer titanium dioxide, and the mass fraction of polymer cladding nano diamond in resistant coating of waiting is 0.1% ~ 0.2%, and the mass fraction of surface modification nanometer titanium dioxide in resistant coating of waiting is 0.1% ~ 2%. According to the solar cell back film, the nano diamond and the nano titanium dioxide are introduced into the weather-resistant coating, so that the solar cell back film with excellent comprehensive performance is obtained.
Description
Technical Field
The application relates to the field of solar cells, in particular to a solar cell back film.
Background
With the increasing severity of ecological environment problems, the use of fossil fuel energy is greatly restricted, however, the photovoltaic industry mainly using solar cells will be rapidly developed and popularized. The solar cell module packaging material mainly comprises glass, an EVA adhesive film, a frame, a back plate film, a junction box, silica gel and the like. The back plate film is arranged on the back surface of the solar panel and is an important packaging material of a solar cell module, the main material of the back plate film is a polyethylene terephthalate (PET) film, the PET film has excellent electrical insulation, water blocking and oxygen blocking performances, but the PET film has poor weather resistance and poor resistance to humid aging, and a fluorine material with good composite weather resistance and water blocking performance is generally required to be used for protection. The compounding process includes two types, compounding type and coating type. The compound adhesive type solar backboard back film (TPT, KPK and the like) is formed by bonding and compounding PVF or PVDF and other fluorine materials with a PET base material through an adhesive. Due to the fact that the adhesive exists on the two sides of the PET substrate inside the back film, the quality of the adhesive is different, and the quality of the adhesive is different in the compounding process, the compound back film is affected by double factors of humidity and temperature in the long-term outdoor use process of the battery assembly, hydrolysis of an adhesive layer is prone to occurring, the fluorine film and the PET substrate layer are peeled off finally, and the long-term reliable requirement of the battery assembly is difficult to meet. The coating type back plate film adopts fluorocarbon coating and is directly coated on the PET substrate to form the fluorocarbon coating, so that the production process and the economical efficiency of the back film are greatly improved, the fluorocarbon coating film can be directly attached with EVA, and the coating film can be subjected to corona treatment if necessary, so that the attachment fastness can be improved. Therefore, the fluorocarbon coating, especially the water-based fluorocarbon coating, is used for replacing composite films such as PVF, PVDF and the like, and is applied to the solar backboard, so that the manufacturing difficulty and the material cost of the backboard can be reduced, and compared with the traditional composite backboard, the water-based fluorocarbon coating has obvious competitive advantages, has the characteristic of zero VOC or low VOC, and is an environment-friendly coating. But the adhesion of the fluorocarbon coating is poor, and the mechanical property of the existing solar back film needs to be further improved.
Disclosure of Invention
An object of the present application is to provide a solar cell back film excellent in overall performance.
In order to achieve the above purpose, the application provides a solar cell back film, including the PET substrate layer and set up the resistant coating of the at least one side of PET substrate layer, resistant coating includes fluorocarbon resin and dispersion and is in functional filler in the fluorocarbon resin, functional filler includes polymer cladding nano diamond and surface modification nano titanium dioxide, polymer cladding nano diamond is in the mass fraction in resistant coating is 0.1% ~ 0.2%, surface modification nano titanium dioxide is in the resistant coating of resistant coating mass fraction is 0.1% ~ 2%.
Further, the mass fraction of the functional filler in the weather-resistant coating is 2-4%.
Further, the mass ratio of the polymer coated nano diamond to the surface modified nano titanium dioxide is 1 (1-4).
Further, the polymer-coated nanodiamonds have a particle size of 1nm to 500nm.
Further, the particle size of the nano-diamond is 50nm to 200nm.
Further, the modified nano titanium dioxide is the nano titanium dioxide modified by the surface of a silane coupling agent.
Further, the polymer-coated nanodiamond is a polymethylmethacrylate-coated nanodiamond.
Compared with the prior art, the beneficial effect of this application lies in: according to the solar cell back film, the nano diamond and the nano titanium dioxide are introduced into the weather-resistant coating, so that the solar cell back film with good mechanical property, weather resistance, water vapor isolation capability and heat conductivity is obtained.
Detailed Description
The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application provides a solar cell back film, including the PET substrate layer and set up the resistant coating of waiting in at least one side of PET substrate layer, this resistant coating of waiting includes fluorocarbon resin and the functional filler of dispersion in fluorocarbon resin, and the functional filler includes polymer cladding nano diamond and surface modification nano titanium dioxide, and the mass fraction of polymer cladding nano diamond in resistant coating of waiting is 0.1% ~2%, and the mass fraction of surface modification nano titanium dioxide in resistant coating of waiting is 0.1% ~ 2%.
The nano-diamond has various excellent characteristics such as high modulus, high hardness, high thermal conductivity, good insulation, low friction coefficient, wear resistance, good chemical stability and the like. In the application, the nano diamond is added into the weather-resistant coating, so that the cohesion of the weather-resistant coating is improved, and the adhesive force and the mechanical property of the weather-resistant coating are improved; meanwhile, the nano-diamond can effectively fill up pores among resin and other raw materials, so that the compactness and corrosion resistance of the coating are improved; in addition, the high-thermal-conductivity nano-diamond can form a thermal conduction path in the weather-resistant coating, so that the heat dissipation performance of the coating is improved, and the service life of the solar cell is prolonged. However, nano-diamond is easy to agglomerate, and if the nano-diamond is directly added into resin without treatment, the nano-diamond is difficult to be uniformly dispersed into the resin, and even the mechanical property of a final coating is influenced because the particle size after agglomeration is larger. Therefore, it is necessary to perform a surface treatment on the nanodiamond so that it can be relatively uniformly dispersed in the resin. According to the method, the surface of the nano-diamond is modified in a polymer coating mode, the obtained polymer-coated nano-diamond can be well dispersed in resin, and the method has a remarkable effect on the improvement of the mechanical property, the compactness, the heat-conducting property and the weather resistance of a coating.
The nano titanium dioxide can improve the ultraviolet aging resistance of the weather-resistant coating, can effectively fill up the pores between resin and other raw materials, and improves the compactness and corrosion resistance of the coating. Similarly, the nano titanium dioxide without surface treatment has poor dispersion uniformity in resin, and the nano titanium dioxide surface is modified by the method, so that the dispersion uniformity of the nano titanium dioxide in the resin is improved.
According to the solar cell back film, the solar cell back film with good compactness, good mechanical property, good aging resistance and good heat conduction performance is obtained by compounding the nano diamond and the nano titanium dioxide.
In some preferred embodiments, the mass ratio of the polymer-coated nano-diamond to the surface-modified nano-titanium dioxide is 1 (1-4). Experiments show that when the content of the polymer coated nano diamond exceeds that of the nano titanium dioxide, the adhesive force of the weather-resistant coating is reduced to a certain degree.
In some embodiments, the nanodiamonds have a particle size of 1nm to 500nm. Further, the particle size of the nano-diamond is 50nm to 200nm. Experiments show that when the particle size of the nano diamond is too large, the adhesive force of the weather-resistant coating and the mechanical property of the back film are easily influenced.
In some embodiments, the nanodiamonds are subjected to at least one of the following surface modification methods prior to being coated: surface carboxylation, hydrogenation, ammoniation, amidation, acyl chlorination and hydroxylation. Before coating the nano-diamond, the surface of the nano-diamond is modified, so that the coating of the polymer on the surface of the nano-diamond is facilitated.
The polymer used to coat the nanodiamonds may be various polyesters. In one embodiment, the polymer coated on the surface of the nanodiamond is polymethyl methacrylate.
In some embodiments, the modified nano-titania is a silane coupling agent surface-modified nano-titania.
In some embodiments, the weather-resistant coating is formed by curing a fluorocarbon coating, and the fluorocarbon coating comprises a water-based fluorocarbon resin, a curing agent, a functional filler, an auxiliary agent and water.
In some embodiments, the adjuvant in the fluorocarbon coating includes at least one of: wetting dispersant, defoaming agent, thickening agent and leveling agent.
The wetting dispersant can be one or a mixture of nonionic polyurethane dispersants, polycarboxylate ammonium dispersants and polyethylene glycol ether ester dispersants. The defoaming agent can be one or a mixture of two of polysiloxane and organic alcohol defoaming agents. The thickener can be one or the mixture of two of associative polyether thickener and associative polyurethane thickener. The flatting agent can be one or a mixture of more of a fluorine modified surfactant flatting agent, an acrylic flatting agent and a polyether modified polydimethylsiloxane flatting agent.
In some embodiments, the curing agent is an aqueous polyisocyanate curing agent.
In some embodiments, the aqueous fluorocarbon resin is an aqueous fluororesin emulsion formed by copolymerizing FEVE with an acrylic resin. In other embodiments, the aqueous fluororesin is an emulsion formed from a tetrafluoroethylene/hexafluoropropylene copolymer.
[ example 1 ]
Raw materials: 50% of water-based fluorocarbon emulsion (sold in markets), 12% of water-based polyisocyanate curing agent, 3% of wetting dispersant, 0.5% of defoaming agent, 0.3% of thickening agent, 0.2% of flatting agent, 1% of polymer-coated nano diamond and 1% of modified nano titanium dioxide, and the balance of water.
The preparation method of the polymer coated nano-diamond comprises the following steps: (1) Mixing nano-diamond with the particle size of 50nm and deionized water to prepare a dispersion liquid with the mass fraction of 6%, then adding sodium dodecyl benzene sulfonate, and stirring for 2 hours, wherein the adding amount of the sodium dodecyl benzene sulfonate is 0.8% of the mass of the nano-diamond; (2) Heating the dispersion liquid to 85 ℃ under the stirring condition, stabilizing for 5min, and adding an initiator potassium persulfate; (3) Dropwise adding methacrylic acid into the dispersion liquid obtained in the step (2), and reacting for 12 hours in a heat preservation manner after dropwise adding, wherein the adding amount of the methacrylic acid is 80% of the mass of the nano-diamond; (4) And (4) cooling the reaction liquid obtained in the step (3) to room temperature, carrying out vacuum filtration, placing the filter cake in a drying oven for drying, and crushing the dried filter cake to obtain the polymer-coated nano-diamond. The steps (1) to (4) are carried out under a nitrogen atmosphere.
The preparation method of the modified nano titanium dioxide comprises the following steps: mixing nano titanium dioxide with the particle size of 25nm and acetic acid to prepare a dispersion liquid with the mass fraction of 60%, adding a silane coupling agent KH-570, and stirring for 24 hours, wherein the adding amount of KH-570 is 20% of that of the nano titanium dioxide; and drying the product in a drying oven for 24 hours after washing to obtain the modified nano titanium dioxide.
Preparing a fluorocarbon coating: according to the above measurement, deionized water, wetting dispersant and defoamer are stirred and dispersed uniformly at room temperature, then functional filler is added, stirring and dispersing are continued, then aqueous fluororesin emulsion and flatting agent are added, stirring is carried out, finally curing agent is added, and stirring is carried out uniformly, so as to obtain the fluorocarbon coating. And (3) carrying out an adhesion test on the prepared fluorocarbon coating, coating the fluorocarbon coating on a base plate according to the test method of the standard GB/T9286-1998, and carrying out the adhesion test after drying, wherein the test result is shown in table 2.
Preparing a solar cell back film: providing a PET substrate with the thickness of 200 μm, coating the fluorocarbon coating on two sides of the PET substrate, and drying in an oven, thereby forming weather-resistant coatings on two sides of the PET substrate, wherein the thickness of the weather-resistant coatings is 20 μm.
The following performance tests were performed on the prepared solar cell back film: the water vapour transmission rate of the backsheet was tested according to the standard ASTM F1249 using a TSY-W2 water vapour transmission rate tester. The backsheet was tested for tensile strength and elongation at break according to standard ASTM D882. The peel strength of the backing film after lamination with the EVA adhesive film was tested according to standard GB/T2790-1995. The resistance of the backing film to wet heat aging is tested according to standard IEC 61215. The UV ageing properties of the backing film were tested according to ISO Standard 4892-2. The salt fog resistance of the backsheet was tested according to standard GB/T2423.17. The thermal conductivity of the backing film was tested according to standard GB/T10297-2015. The results are shown in Table 2.
[ example 2 ]
Example 2 differs from example 1 in that: when the polymer coated nano-diamond is prepared, the particle size of the nano-diamond is 100nm.
[ example 3 ] A method for producing a polycarbonate
Example 3 differs from example 1 in that: when the polymer-coated nanodiamond was prepared, the particle size of the nanodiamond was 200nm.
[ example 4 ]
Example 4 differs from example 1 in that: when the polymer coated nano-diamond is prepared, the particle size of the nano-diamond is 500nm.
[ example 5 ]
Example 5 differs from example 1 in that: when the polymer-coated nanodiamond was prepared, the particle size of the nanodiamond was 10nm.
[ example 6 ]
Example 6 differs from example 3 in that: the functional filler comprises 0.5 percent of polymer coated nano diamond and 1.5 percent of modified nano titanium dioxide.
[ example 7 ] A method for producing a polycarbonate
Example 7 differs from example 3 in that: the functional filler comprises 0.2 percent of polymer coated nano diamond and 1.8 percent of modified nano titanium dioxide.
[ example 8 ]
Example 8 differs from example 3 in that: the functional filler comprises 1.5 percent of polymer coated nano diamond and 0.5 percent of modified nano titanium dioxide.
[ example 9 ]
Example 9 differs from example 3 in that: the functional filler comprises 1.8 percent of polymer coated nano diamond and 0.2 percent of modified nano titanium dioxide.
[ example 10 ]
Example 10 differs from example 3 in that: the functional filler comprises 2 percent of polymer coated nano diamond and 2 percent of modified nano titanium dioxide.
Comparative example 1
Comparative example 1 differs from example 1 in that: the raw materials do not contain functional filler.
Comparative example 2
Comparative example 2 differs from example 3 in that: the functional filler comprises only 1% polymer coated nanodiamonds.
Comparative example 3
Comparative example 3 differs from example 3 in that: the functional filler comprised only 2% polymer coated nanodiamonds.
Comparative example 4
Comparative example 4 differs from example 3 in that: the functional filler comprised only 0.1% polymer coated nanodiamonds.
Comparative example 5
Comparative example 5 differs from example 3 in that: the functional filler only comprises 1 percent of modified nano titanium dioxide.
Comparative example 6
Comparative example 6 differs from example 3 in that: the functional filler only comprises 2 percent of modified nano titanium dioxide.
Comparative example 7
Comparative example 7 differs from example 3 in that: the functional filler only comprises 0.1 percent of modified nano titanium dioxide.
Comparative example 8
Comparative example 8 is different from comparative example 1 in that the surface of the nanodiamond is not coated with the polymer.
Comparative example 9
Comparative example 9 is different from comparative example 5 in that the surface of the nano titanium dioxide is not modified.
Table 1 shows the addition of the functional filler in each of examples and comparative examples. Table 2 lists the performance test data for each example and comparative example.
TABLE 1
In table 2, if the transverse tensile strength and the longitudinal tensile strength of the backsheet both reach above 120MPa, pass is recorded, otherwise fail is recorded; the transverse elongation at break and the longitudinal elongation at break of the back film both reach more than 100 percent and are recorded as passing, otherwise, the back film is recorded as not passing; under the aging conditions of 85 ℃, 85 percent RH and 2000h, if the back film is not pulverized, does not bubble and does not delaminate, and delta E is less than or equal to 2, the back film is marked as passing, otherwise, the back film is marked as not passing; the back membrane is not pulverized, does not bubble and does not delaminate under the conditions of 65 percent RH,60KWh ultraviolet irradiation at 65 ℃, and the delta E is less than or equal to 2 and is recorded as passing, otherwise, the back membrane is recorded as not passing; when the back film is subjected to a salt spray test, the back film is not pulverized, foamed or layered for 3000 hours, and the delta E less than or equal to 2 is recorded as passing, otherwise, the back film is recorded as not passing.
TABLE 2
As can be seen from the adhesion data in Table 2, the adhesion of the weather-resistant coating can be effectively improved by compounding the polymer coated nano-diamond and the modified nano-titanium dioxide, the particle size of the nano-diamond has a certain influence on the adhesion of the weather-resistant coating, and the excessive or insufficient particle size of the nano-diamond is not beneficial to the improvement of the adhesion. Also, when the content of the polymer-coated nanodiamonds was too low (comparative example 4), the effect of improving the adhesion was not significant.
As can be seen from the data of tensile strength and elongation at break in Table 2, the polymer coated nano-diamond can effectively improve the mechanical properties of the back film under the condition of proper particle size and addition amount. When the particle size of the nano-diamond reaches 500nm, the addition of the nano-diamond is not beneficial to the improvement of the mechanical property of the back membrane.
As can be seen from the peel strength data in Table 2, the peel strength of the back film can be effectively improved by compounding the polymer coated nano diamond and the modified nano titanium dioxide.
From the data of the water vapor transmission rate in table 2, it can be seen that the compounding of the polymer-coated nano diamond and the modified nano titanium dioxide can significantly improve the water vapor isolation capability of the back film.
As can be seen from the test data of the resistance to heat and humidity aging, ultraviolet aging and salt spray resistance in Table 2, the aging resistance and corrosion resistance of the back film can be improved by compounding the polymer coated nano diamond and the modified nano titanium dioxide.
As can be seen from the thermal conductivity test data in table 2, the addition of the polymer-coated nanodiamond can effectively improve the thermal conductivity of the back film.
The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.
Claims (4)
1. The solar cell back film is characterized by comprising a PET (polyethylene terephthalate) base material layer and a weather-resistant coating arranged on at least one side of the PET base material layer, wherein the weather-resistant coating comprises fluorocarbon resin and functional fillers dispersed in the fluorocarbon resin, the mass fraction of the functional fillers in the weather-resistant coating is 2-4%, the functional fillers comprise polymer-coated nano-diamonds and surface-modified nano-titanium dioxide, the mass fraction of the polymer-coated nano-diamonds in the weather-resistant coating is 0.1-2%, the mass fraction of the surface-modified nano-titanium dioxide in the weather-resistant coating is 0.1-2%, the mass ratio of the polymer-coated nano-diamonds to the surface-modified nano-titanium dioxide is 1 (1~4), and the particle size of the nano-diamonds in the polymer-coated nano-diamonds is 50nm to 200nm.
2. The solar cell backsheet according to claim 1, wherein the modified nano titanium dioxide is a silane coupling agent surface-modified nano titanium dioxide.
3. The solar cell backsheet of claim 1, wherein the polymer-coated nanodiamond is a polymethylmethacrylate-coated nanodiamond.
4. The solar cell backsheet of claim 1, wherein both sides of the PET substrate layer are provided with the weatherable coating.
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| CN103632741A (en) * | 2013-06-21 | 2014-03-12 | 宁波墨西科技有限公司 | High-thermal-conductivity and high-electrical-conductivity graphene film and preparation process thereof |
| CN105218987A (en) * | 2015-11-03 | 2016-01-06 | 深圳大学 | A kind of blend film containing Graphene and preparation method thereof |
| JP2018125525A (en) * | 2017-01-27 | 2018-08-09 | 東レ株式会社 | Polyester film for solar battery back sheet, and method for manufacturing polyester film roll for solar battery back sheet, which is formed by winding up polyester film for solar battery back sheet |
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| CN103632741A (en) * | 2013-06-21 | 2014-03-12 | 宁波墨西科技有限公司 | High-thermal-conductivity and high-electrical-conductivity graphene film and preparation process thereof |
| CN105218987A (en) * | 2015-11-03 | 2016-01-06 | 深圳大学 | A kind of blend film containing Graphene and preparation method thereof |
| JP2018125525A (en) * | 2017-01-27 | 2018-08-09 | 東レ株式会社 | Polyester film for solar battery back sheet, and method for manufacturing polyester film roll for solar battery back sheet, which is formed by winding up polyester film for solar battery back sheet |
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