CN108410340B - Black weather-resistant coating and preparation method and application thereof - Google Patents
Black weather-resistant coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a black weather-resistant coating, a preparation method and application thereof, wherein the coating consists of A, B two components, and the component A comprises the following components: 100 parts of matrix resin, 0.1-20 parts of black dye, 0-40 parts of silane coupling agent modified filler, 5-10 parts of auxiliary agent, 0.5-2 parts of curing agent accelerator and 50-150 parts of solvent; the component B comprises: 5-25 parts of curing agent and 5-50 parts of solvent. When the adhesive is used, the hydroxyl contained in the component A and the isocyanate group contained in the component B are mixed and stirred according to the molar ratio of 1: 0.5-2, and then the mixture is coated. The invention has a reflectivity of more than 30% in an infrared region and has good insulativity, aging resistance and UV resistance. The weather-resistant coating can be applied to photovoltaic back plates, reduces the heat absorption and temperature of the whole assembly, improves the battery conversion efficiency of the black assembly, and can realize power gain.
Description
Technical Field
The invention relates to the technical field of preparation of photovoltaic equipment, in particular to a black weather-resistant coating.
Background
As a green solution to the traditional energy source, a photovoltaic cell assembly is a device that directly converts light energy into electrical energy through a photoelectric effect or a photochemical effect. The solar backboard is used as an encapsulating material of the photovoltaic module and is positioned at the outermost layer.
The energy of solar radiation is mainly concentrated in the ultraviolet region, visible region, and infrared region. The ultraviolet region is 7%, the visible region occupies 50% of energy, and the infrared region occupies about 43%. The photovoltaic cell mainly absorbs and utilizes 400-700 nm visible light. The infrared light with the wavelength of more than 1100nm is not converted into electric energy by the utilization of the battery piece, but is directly converted into heat energy, so that the internal temperature of the photovoltaic module is rapidly increased. Data reports that the conversion efficiency of the crystalline silicon solar cell is reduced by 0.4-0.5% when the working temperature of the crystalline silicon solar cell is increased by 1 ℃. Therefore, the heat dissipation is enhanced, the working temperature of the solar cell is reduced, and the effective way for improving the working efficiency of the solar cell is provided.
The conventional heat dissipation modes mainly include heat conduction, convection, and heat radiation. However, since the photovoltaic module is limited by space, material environment and cost, heat dissipation by convection and heat conduction is not suitable. The thermal radiation does not have the limiting factors, if the material can reflect infrared rays, the temperature of the surface of an object can be reduced, the heating source is cut off from the source, and the material has a good cooling effect.
The solar backboard is attractive in design and black, and can reflect 70-80% of infrared light compared with a white backboard, and the black backboard can only reflect 4% of infrared light in an infrared region due to the addition of carbon black and the like, absorbs most of infrared light, and the temperature of a black backboard component is increased. Traditional infrared reflective coatings, such as patents CN201210436521.2, CN201210052510.4, CN201210169272.5, CN201210052925.1, CN201520087727.8, etc., are respectively added with fillers such as graphene, nano infrared ceramic powder, carbon fibers, carbon nanotubes, carbon nanomaterials, indium tin oxide, tin antimony oxide, etc., which are generally expensive and theoretically not suitable for large-scale use.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the black weather-resistant coating, the preparation method and the application thereof, and the coating prepared by the coating has the reflectivity of more than 50% in an infrared region, can be applied to coating type and composite photovoltaic back plates, reduces the heat absorption and temperature of the whole assembly, and improves the battery conversion efficiency of the black assembly. The back plate prepared by the invention can be applied to building integration, has the same color tone with a dark building, improves the appearance, increases the power, and has good insulativity (the CTI grade can reach 600v), aging resistance and UV resistance.
The purpose of the invention is realized by the following technical scheme: a black weather-resistant coating is composed of two components A and B, wherein the component A comprises the following components in parts by mass: 100 parts of matrix resin, 0.1-20 parts of black dye, 0-40 parts of silane coupling agent modified filler, 5-10 parts of auxiliary agent, 0.5-2 parts of curing agent accelerator and 50-150 parts of solvent; the auxiliary agent comprises 0-5 parts by mass of a dispersing agent, 0.5-5 parts of a flatting agent and 0-5 parts of a light stabilizer. The component B comprises: 5-25 parts of curing agent and 5-50 parts of solvent. When the adhesive is used, the hydroxyl contained in the component A and the isocyanate group contained in the component B are mixed and stirred according to the molar ratio of 1: 0.5-2, and then the mixture is coated.
Further, the matrix resin is selected from polyurethane, acrylic resin and fluorine-containing resin. The fluorine-containing resin is selected from vinylidene fluoride (PVDF), trifluoroethylene-vinyl ether copolymer, trifluoroethylene-vinyl ester copolymer, tetrafluoroethylene-vinyl ether copolymer and tetrafluoroethylene-vinyl ester copolymer.
Further, the curing agent is selected from isocyanate, amino resin, blocked isocyanate and melamine.
Further, the dispersing agent is selected from a block copolymer dispersing agent containing pigment affinity groups, an acrylic block copolymer dispersing agent and an acidic group-containing copolymer dispersing agent, the leveling agent is selected from a polyether siloxane copolymer leveling agent, a reactive polyether modified fluorosilicone leveling agent, a polyether modified polyorganosiloxane leveling agent and a polyacrylate leveling agent, and the light stabilizer is selected from 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, tris (1, 2, 2, 6, 6-pentamethyl-4-piperidyl) phosphite ester, sebacic acid bis-2, 2, 6, 6-tetramethylpiperidine alcohol ester, bis-1-decyloxy-2, 2, 6, 6-tetramethylpiperidine-4-alcohol sebacate, a pigment affinity group-containing block copolymer dispersing agent, an acrylic block copolymer dispersing agent and an acidic group-containing copolymer dispersing agent, and the light stabilizer, The curing accelerator is dibutyltin dilaurate, dioctyltin dilaurate, monobutyltin oxide or stannous octoate, and the solvent is selected from toluene, xylene, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and butanone.
The black dye is selected from direct light-fast dyes, direct diazo dyes, direct cross-linking dyes and azo dyes containing complex metals, the filler is selected from glass beads, ceramic beads, iron chromium manganese oxide, calcium titanium manganese oxide and cobaltous oxide, the average particle size of the filler is 1-20 mu m, the silane coupling agent is selected from gamma-aminopropyltriethoxysilane, gamma-glycidyl ether aminopropyltrimethoxysilane, gamma-methacryloyloxy-propyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, N- β - (aminoethyl) -gamma-aminopropylmethyldimethoxysilane and N- β - (aminoethyl) -gamma-aminopropylmethyltrimethoxysilane, and the coupling agent is selected from isopropyltris (dioctylphosphonoxy) titanate, isopropyldioleacyloxy (dioctylphosphonoxy) titanate, monoalkoxy unsaturated fatty acid titanate and bis (dioctylphosphonoxy) ethylenetitanate.
The invention also provides a preparation method of the black weather-resistant coating, which comprises the following steps:
(5.1) adding 100 parts of filler into a high-speed dispersion machine, stirring and adding 0.5-5 parts of silane coupling agent at the rotating speed of 3000-plus-one 8000r/min under the condition of keeping the nitrogen atmosphere in the kettle, increasing the rotating speed to 10000-plus-one 30000r/min after the addition is finished, keeping the temperature in the kettle at 110-plus-one 140 ℃, continuing stirring for 1-2 h, naturally cooling to room temperature to obtain the coupling agent modified filler, and sealing and storing for later use; (5.2) stirring 100 parts of matrix resin, 0-5 parts of dispersing agent and 50-150 parts of solvent in a container for pre-dispersion, grinding for 5min by using a sand mill, adding 0-40 parts of coupling agent modified filler prepared from (5.1), grinding until the particle fineness is less than or equal to 5 microns, stirring while heating to 50-80 ℃, adding 0.1-20 parts of black dye, cooling to 40 ℃, subsequently adding 0.5-5 parts of flatting agent, 0-5 parts of light stabilizer and 0.5-2 parts of curing agent accelerator, dispersing and stirring at a high speed of 1000-3000 rpm, filtering to obtain a component A, and storing in a dry sealed container for later use;
(5.3) mechanically stirring and uniformly mixing 5-25 parts of curing agent and 0-50 parts of solvent, filtering to obtain a component B, and storing the component B in a dry sealed container for later use;
(5.4) when used, the hydroxyl group contained in the component A and the isocyanate group contained in the component B are mixed and stirred according to the molar ratio of 1: 0.5-2, and then coating is carried out.
The invention also provides an application of the black weather-resistant coating, which specifically comprises the following steps: coating a black weather-resistant coating on one side of a non-transparent substrate to serve as a black high-reflection bonding layer; and coating a black weather-resistant coating on the other side of the non-transparent substrate to serve as a black weather-resistant layer to prepare the black infrared high-reflection backboard, wherein the substrate is selected from biaxially oriented films such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polybutylene naphthalate. The thickness of the black high-reflection bonding layer is 3-40 mu m, the thickness of the black weather-resistant coating is 10-40 mu m, and the thickness of the base material is 50-300 mu m.
Further, the construction process of the photovoltaic back panel is described as follows: selecting a non-transparent substrate film with the thickness of 50-300 microns, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Firstly coating a layer of black weather-resistant coating on the surface layer of a non-transparent substrate film to serve as a weather-resistant layer, drying the weather-resistant layer with hot air at 120-150 ℃ for 2-5 min to form a film, so as to prepare the weather-resistant layer with the thickness of about 10-40 mu m, coating a layer of black weather-resistant coating on the other side of a base film, drying the base film with hot air at 120-150 ℃ for 2-5 min to form a film, so as to prepare a bonding layer with the thickness of about 3-40 mu m, and thus preparing the black.
The invention has the beneficial effects that:
1. the invention has good infrared high reflectivity, good insulativity (CTI grade can reach 600v), excellent ageing resistance and UV resistance, simple preparation method process and easy operation
2. The invention adopts the fluorine-containing coating as the weather-resistant layer, and has excellent weather resistance. The adhesive layer can adopt one of a polyurethane coating, an acrylate coating and a fluorine coating, so that the cost of the back plate can be effectively controlled.
3. The adhesive layer of the invention has good adhesive property with EVA, PVB and the like.
Drawings
FIG. 1 is a graph of reflectivity data for 4 embodiments of the present invention.
Detailed Description
The present invention is further specifically described below with reference to examples, but is not limited thereto.
In the examples of the present invention, ethylene terephthalate (PET) having a thickness of 250 μm was used as the base layer in the following examples.
Example 1:
the coating formula of the weather-resistant layer and the bonding layer is as follows (in parts by mass):
the component A comprises:
1) adding 100 parts of iron chromium black (Schauter, USA), keeping the nitrogen atmosphere in the kettle, slowly adding 5 parts of coupling agent gamma-aminopropyl triethoxysilane (Aladdin reagent) while stirring at 8000r/min, increasing the rotation speed to 30000r/min after the addition is finished, keeping the temperature in the kettle at 140 ℃, continuously stirring for 1h, naturally cooling to room temperature to obtain coupling agent modified iron chromium black, and sealing and storing for later use;
100 parts of fluorine-containing resin GK570 (Japanese platinum coating), 5 parts of dispersant BYK108 (Germany Pickery chemical) and 150 parts of solvent xylene are stirred and pre-dispersed in a container, ground for 5min by a sand mill, added with 30 parts of coupling agent modified iron-chromium black until the particle fineness is less than or equal to 5 microns, stirred and heated to 80 ℃, added with 0.1 part of organic dye direct black 144 (Switzerland soda), cooled to 40 ℃, subsequently added with 5 parts of flatting agent BYK355 (Germany Pickery chemical) and 2 parts of curing agent accelerator dibutyltin dilaurate (Allantin reagent), dispersed and stirred at a high speed of 3000rpm, filtered to obtain a component A, and stored in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 25 parts of curing agent N3390 (German Bayer) and 50 parts of solvent xylene, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
the back plate manufacturing process comprises the following steps:
and selecting a PET film with the thickness of 250 micrometers, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Coating the surface layer of a PET base film according to the coating formula of the weather-resistant layer, drying the PET base film for 5min at 120 ℃ to form a film, and preparing the weather-resistant layer with the thickness of about 40 mu m, coating the other side of the base film according to the coating formula of the adhesive layer by adopting the same process, and drying the base film for 5min at 120 ℃ to form the film, and preparing the adhesive layer with the thickness of about 40 mu m. The back plate A can be obtained according to the formula.
Example 2:
the coating formula of the weather-resistant layer and the bonding layer is as follows (in parts by mass):
the component A comprises:
1) adding 100 parts of calcium-titanium-manganese oxide (Shanghai titanium) into a high-speed dispersion machine, keeping the nitrogen atmosphere in a kettle, slowly adding 0.5 part of vinyl trimethoxy silane (Aladdin reagent) at the rotating speed of 3000r/min while stirring, increasing the rotating speed to 10000r/min after the addition is finished, keeping the temperature in the kettle at 110 ℃, continuously stirring for 2 hours, naturally cooling to room temperature to obtain the coupling agent modified calcium-titanium-manganese oxide, and sealing and storing for later use;
100 parts of fluorine-containing resin GK570 (Japanese platinum coating), 3 parts of dispersant BYK161 (Germany Picker chemical) and 100 parts of solvent butyl acetate are stirred in a container for pre-dispersion, then ground for 5min by a sand mill, 30 parts of coupling agent modified calcium titanium manganese oxide are added until the particle fineness is less than or equal to 5 microns, the temperature is raised to 50 ℃ while stirring, 5 parts of organic dye direct black 144 (Switzerland soda) is added, when the temperature is reduced to 40 ℃,3 parts of flatting agent BYK355 (Germany Picker chemical) are subsequently added, 1 part of curing agent accelerator dibutyltin dilaurate (Allantin reagent) is added, 1000 parts of components are obtained by filtering after high-speed dispersion stirring, and the components are stored in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 20 parts of curing agent N3390 (German Bayer) and 20 parts of solvent butyl acetate, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
the back plate manufacturing process comprises the following steps:
and selecting a PET film with the thickness of 250 micrometers, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Coating the surface layer of a PET base film according to the coating formula of the weather-resistant layer, drying the PET base film for 3min at 150 ℃ to form a film, preparing the weather-resistant layer with the thickness of about 20 mu m, coating the other side of the base film according to the coating formula of the adhesive layer by adopting the same process, and drying the base film for 3min at 150 ℃ to form the film, thus preparing the adhesive layer with the thickness of about 10 mu m. The back plate B can be obtained according to the formula.
Example 3:
the coating formula of the weather-resistant layer and the bonding layer is as follows (in parts by mass):
the component A comprises:
100 parts of a fluorine-containing resin GK570 (Japanese gold dope) and 50 parts of propylene glycol methyl ether acetate as a solvent were stirred in a vessel to be predispersed, and then 20 parts of a metal complex dye X55 (Pasteur, Germany) was added thereto while stirring to 60 ℃ at an elevated temperature. Subsequently adding 0.5 part of curing agent accelerator dibutyltin dilaurate (avadin reagent) and 5 parts of light stabilizer 292 (Taiwan double bond), dispersing and stirring at a high speed of 1000rpm, filtering to obtain a component A, and storing in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 5 parts of curing agent Desmodur Z4470 (German Bayer) and 5 parts of solvent propylene glycol methyl ether acetate, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
the back plate manufacturing process comprises the following steps:
and selecting a PET film with the thickness of 250 micrometers, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Coating the surface layer of a PET base film according to the coating formula of the weather-resistant layer, drying the PET base film for 2min at 150 ℃ to form a film, preparing the weather-resistant layer with the thickness of about 10 mu m, coating the other side of the base film according to the coating formula of the adhesive layer by adopting the same process, and drying the base film for 2min at 150 ℃ to form the film, and preparing the adhesive layer with the thickness of about 3 mu m. The back plate C can be obtained according to the formula.
Example 4:
the coating formula of the weather-resistant layer is as follows (in parts by mass):
the component A comprises:
adding 100 parts of cobaltous oxide (Schauter USA) into a high-speed dispersion machine, keeping the nitrogen atmosphere in a kettle, slowly adding 3 parts of coupling agent propyl tri (dioctyl pyrophosphato acyloxy) titanate (Aladdin reagent) under stirring at the rotating speed of 5000r/min, increasing the rotating speed to 30000r/min after the addition is finished, keeping the temperature in the kettle at 120 ℃, continuing stirring for 1h, naturally cooling to room temperature to obtain coupling agent modified iron-chromium black, and sealing and storing for later use;
100 parts of fluorine-containing resin WF-J313 (tin-free Wanbo coating), 3 parts of dispersant BYK161 (Germany Bikk chemical) and 50 parts of solvent butyl acetate are stirred in a container for pre-dispersion, then ground for 5min by a sand mill, 20 parts of coupling agent modified cobaltous oxide is added until the particle fineness is less than or equal to 5 microns, the temperature is raised to 60 ℃ while stirring, 5 parts of metal complex dye X55 (Germany Basff) is added, when the temperature is reduced to 40 ℃,1 part of BYK355 (Germany Bikk chemical) and 1 part of curing agent accelerator dibutyltin dilaurate (Aladdin reagent) are subsequently added, the components A are obtained by filtering after high-speed dispersion stirring at 3000rpm, and the components A are stored in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 20 parts of curing agent Desmodur Z4470 (German Bayer) and 20 parts of solvent butyl acetate, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
the adhesive layer coating formula is as follows (in parts by mass):
the component A comprises:
adding 100 parts of cobaltous oxide (Schauter USA) into a high-speed dispersion machine, keeping the nitrogen atmosphere in a kettle, slowly adding 3 parts of coupling agent propyl tri (dioctyl pyrophosphato acyloxy) titanate (Aladdin reagent) under stirring at the rotating speed of 5000r/min, increasing the rotating speed to 30000r/min after the addition is finished, keeping the temperature in the kettle at 120 ℃, continuing stirring for 1h, naturally cooling to room temperature to obtain coupling agent modified iron-chromium black, and sealing and storing for later use;
100 parts of acrylic resin LR7765 (Mitsubishi, Japan), 5 parts of dispersant BYK161 (Germany Picker chemical) and 50 parts of solvent butyl acetate are stirred in a container for pre-dispersion, then ground by a sand mill for 5min, 20 parts of coupling agent modified cobaltous oxide and 20 parts of glass microspheres (American 3M) are added, the sand mill is ground for 20min, the temperature is raised to 60 ℃ while stirring, 5 parts of metal complex dye X55 (Germany Pasteur) is added, when the temperature is reduced to 40 ℃, 1BYK355 (Germany Picker chemical) is subsequently added, 1 part of curing agent accelerator dibutyltin dilaurate (Latin reagent) is added, the component A is obtained by high-speed dispersion stirring at 3000rpm and filtration, and the component A is stored in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 20 parts of curing agent Desmodur Z4470 (German Bayer) and 20 parts of solvent butyl acetate, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
and selecting a PET film with the thickness of 250 micrometers, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Coating the surface layer of a PET base film according to the coating formula of the weather-resistant layer, drying the PET base film for 5min at 120 ℃ to form a film, preparing the weather-resistant layer with the thickness of about 20 mu m, coating the other side of the base film according to the coating formula of the adhesive layer by adopting the same process, and drying the base film for 5min at 120 ℃ to form the film, thus preparing the adhesive layer with the thickness of about 10 mu m. The above formulation results in backsheet D.
Comparative example 1:
in comparative example 1, a PET base film having a thickness of 250 μm was used. Conventional pigment carbon black is employed in the coating formulation;
the coating formulas of the weather-resistant layer and the coating layer are as follows (in parts by mass):
100 parts of fluorine-containing resin GK570 (Japanese platinum coating), 5 parts of dispersant BYK108 (Germany Pickering chemical) and 50 parts of solvent xylene are stirred in a container for pre-dispersion, then ground for 5min by a sand mill, 5 parts of carbon black M11 (Mitsubishi) are added until the particle fineness is less than or equal to 5 microns, 1 part of curing agent accelerator dibutyltin dilaurate (avastin reagent) is added subsequently, component A is obtained by filtration and is stored in a dry sealed container for later use;
and B component:
mechanically stirring and uniformly mixing 20 parts of curing agent N3390 (German Bayer) and 20 parts of solvent xylene, filtering to prepare a component B, and storing the component B in a dry sealed container for later use;
the back plate manufacturing process comprises the following steps:
and selecting a PET film with the thickness of 250 micrometers, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment. Coating the surface layer of a PET base film according to the coating formula of the weather-resistant layer, drying the PET base film for 5min at 120 ℃ to form a film, and preparing the weather-resistant layer with the thickness of about 40 mu m, coating the other side of the base film according to the coating formula of the adhesive layer by adopting the same process, and drying the base film for 5min at 120 ℃ to form the film, and preparing the adhesive layer with the thickness of about 40 mu m. The backing sheet E was obtained according to the above formulation.
Comparative example 2 black backsheet F from other manufacturers.
And (3) performance testing:
and (3) reflectivity testing: the test is carried out according to a reflectivity tester designed according to GB/T13452.3-92, GB/T9270-88, GB/T5211.17-88 and ISO3906-80 standards.
CTI test: the test was carried out according to GB/T4207-2012 standard. The test was carried out using a tracking tester.
Yellowing index: detection was carried out according to GB 2409-80.
Peel strength from EVA: the peel strength test was carried out according to GB/T2790.
The damp-heat test is carried out according to the specification of IEC 61215-.
Reflectance ratio: detection is carried out according to CNCA/CTS 0014-2013.
Power: detection is carried out according to IEC 61215-22016: 4.2.
The black infrared high-reflection back plate obtained by the above embodiment is evaluated by the above test method, and the evaluation results are shown in the following table:
TABLE 1
As can be seen from the test data table 1, the black infrared high-reflection back plate provided by the invention has good reflection performance in an infrared region, good CTI performance, excellent aging resistance and excellent flame retardant property. The above description is only a preferred embodiment of the present invention, and is not intended to define the scope of the present invention. All equivalent changes and modifications made in accordance with the teachings of the present invention are intended to be covered by the claims of the present invention.
Claims (9)
1. The black weather-resistant coating is characterized by consisting of two components A and B, wherein the component A comprises the following components in parts by mass: 100 parts of matrix resin, 0.1-20 parts of black dye, 0-40 parts of silane coupling agent modified filler, 5-10 parts of auxiliary agent, 0.5-2 parts of curing agent accelerator and 50-150 parts of solvent; the auxiliary agent consists of 0-5 parts by mass of a dispersing agent, 0.5-5 parts of a flatting agent and 0-5 parts of a light stabilizer; the component B comprises: 5-25 parts of a curing agent and 5-50 parts of a solvent; when in use, the hydroxyl contained in the component A and the isocyanate group contained in the component B are mixed and stirred according to the molar ratio of 1: 0.5-2, and then the mixture is coated; the black dye is selected from direct light-fast dye, direct diazo dye, direct crosslinking dye and azo dye containing complex metal.
2. The black weatherable coating of claim 1, wherein said matrix resin is selected from the group consisting of acrylic resins, fluorine-containing resins; the fluorine-containing resin is selected from vinylidene fluoride (PVDF), trifluoroethylene-vinyl ether copolymer, trifluoroethylene-vinyl ester copolymer, tetrafluoroethylene-vinyl ether copolymer and tetrafluoroethylene-vinyl ester copolymer.
3. The black weatherable coating of claim 1, wherein the curing agent is an isocyanate.
4. The black weatherable coating according to claim 3, characterized in that the isocyanate is selected from blocked isocyanates or blocked isocyanates.
5. The black weather-resistant coating according to claim 1, wherein the dispersant is selected from the group consisting of a block copolymer dispersant containing a pigment affinity group, an acrylic block copolymer dispersant, and an acidic group-containing copolymer dispersant, the leveling agent is selected from the group consisting of a polyether siloxane copolymer leveling agent, a reactive polyether-modified fluorosilicone leveling agent, a polyether-modified polyorganosiloxane leveling agent, and a polyacrylate leveling agent, and the light stabilizer is selected from the group consisting of hexadecyl 3, 5-di-tert-butyl-4-hydroxy-benzoate, tris (1, 2, 2, 6, 6-pentamethyl-4-piperidyl) phosphite, bis-2, 2, 6, 6-tetramethylpiperidinol sebacate, bis-1-decyloxy-2, 2, 6, 6-tetramethylpiperidin-4-ol sebacate, and mixtures thereof, The curing accelerator is dibutyltin dilaurate, dioctyltin dilaurate, monobutyltin oxide or stannous octoate, and the solvent is selected from toluene, xylene, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and butanone.
6. The black weather-resistant coating according to claim 1, wherein the filler is selected from glass beads, ceramic beads, iron chromium manganese oxide, calcium titanium manganese oxide and cobaltous oxide, the average particle size of the filler is 1-20 μm, and the silane coupling agent is selected from gamma-aminopropyltriethoxysilane, gamma-glycidylether aminopropyltrimethoxysilane, gamma-methacryloyloxy-propyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, N- β - (aminoethyl) -gamma-aminopropylmethyldimethoxysilane and N- β - (aminoethyl) -gamma-aminopropylmethyltrimethoxysilane.
7. A method for preparing the black weather-resistant paint according to claim 1, comprising the steps of:
(5.1) adding 100 parts of filler into a high-speed dispersion machine, stirring and adding 0.5-5 parts of silane coupling agent at the rotating speed of 3000-plus-one 8000r/min under the condition of keeping the nitrogen atmosphere in the kettle, increasing the rotating speed to 10000-plus-one 30000r/min after the addition is finished, keeping the temperature in the kettle at 110-plus-one 140 ℃, continuing stirring for 1-2 h, naturally cooling to room temperature to obtain the coupling agent modified filler, and sealing and storing for later use;
(5.2) stirring 100 parts of matrix resin, 0-5 parts of dispersing agent and 50-150 parts of solvent in a container for pre-dispersion, grinding for 5min by using a sand mill, adding 0-40 parts of coupling agent modified filler prepared from (5.1), grinding until the particle fineness is less than or equal to 5 microns, stirring while heating to 50-80 ℃, adding 0.1-20 parts of black dye, cooling to 40 ℃, subsequently adding 0.5-5 parts of flatting agent, 0-5 parts of light stabilizer and 0.5-2 parts of curing agent accelerator, dispersing and stirring at a high speed of 1000-3000 rpm, filtering to obtain a component A, and storing in a dry sealed container for later use;
(5.3) mechanically stirring and uniformly mixing 5-25 parts of curing agent and 0-50 parts of solvent, filtering to obtain a component B, and storing the component B in a dry sealed container for later use;
(5.4) when used, the hydroxyl group contained in the component A and the isocyanate group contained in the component B are mixed and stirred according to the molar ratio of 1: 0.5-2, and then coating is carried out.
8. The application of the black weather-resistant coating as claimed in claim 1, which is characterized in that the application comprises: coating a black weather-resistant coating on one side of a non-transparent substrate to serve as a black high-reflection bonding layer; coating a black weather-resistant coating on the other side of the non-transparent substrate to serve as a black weather-resistant layer, and preparing to obtain a black infrared high-reflection backboard, wherein the substrate is selected from polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polybutylene naphthalate biaxially-oriented film; the thickness of the black high-reflection bonding layer is 3-40 mu m, the thickness of the black weather-resistant coating is 10-40 mu m, and the thickness of the base material is 50-300 mu m.
9. The application of the black weather-resistant coating as claimed in claim 8, wherein the construction process of the photovoltaic back panel is described as follows: selecting a non-transparent substrate film with the thickness of 50-300 microns, and carrying out corona treatment to 50-60 dyne/cm by adopting corona equipment; coating a layer of black weather-resistant coating on the surface layer of a non-transparent substrate film to serve as a weather-resistant layer, drying the weather-resistant layer with hot air at 120-150 ℃ for 2-5 min to form a film, so as to obtain a weather-resistant layer with the thickness of 10-40 microns, coating a layer of black weather-resistant coating on the other side of a base film, drying the base film with hot air at 120-150 ℃ for 2-5 min to form a film, so as to obtain a bonding layer with the thickness of 3-40 microns, and thus preparing the black infrared high-.
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| CN109713069B (en) * | 2018-12-21 | 2020-11-13 | 苏州赛伍应用技术股份有限公司 | Black high-reflection solar cell back plate and preparation method thereof |
| CN111732847A (en) * | 2020-06-10 | 2020-10-02 | 苏州福斯特光伏材料有限公司 | Black high-reflection composition, coating, pellet and solar cell back sheet |
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| CN115926548A (en) * | 2022-12-30 | 2023-04-07 | 常州回天新材料有限公司 | Coating composition for black solar cell back panel and preparation method and application thereof |
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