CN114276722A - Light conversion transparent coating for photovoltaic back plate and preparation method and application thereof - Google Patents
Light conversion transparent coating for photovoltaic back plate and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a light conversion transparent coating for a photovoltaic back plate and a preparation method and application thereof. The light conversion transparent coating for the photovoltaic back plate comprises the following components in parts by weight: 70-100 parts of main body resin, 5-8 parts of adhesion promoter, 0.1-1 part of flatting agent, 0.3-1 part of dispersing agent, 5-10 parts of ultraviolet assistant, 5-25 parts of ultraviolet shielding agent, 1-10 parts of light conversion nano assistant, 5-20 parts of polyisocyanate curing agent and 10-60 parts of solvent. The preparation method of the light conversion transparent coating is simple, and the light conversion transparent coating can be coated on the surface of a base material of the photovoltaic back plate, so that the photovoltaic back plate has a light conversion function, the solar light transmittance is increased, and the weather resistance of the photovoltaic back plate is not reduced.
Description
Technical Field
The invention belongs to the technical field of photovoltaic modules, and particularly relates to a light conversion transparent coating for a photovoltaic back plate, and a preparation method and application thereof.
Background
In recent years, double-sided power generation has become a development trend of the photovoltaic industry, so that double-sided components are receiving more and more attention. Traditional double-sided subassembly adopts double-sided glass as main packaging material, but double-glass assembly not only has the technology degree of difficulty big, yields low grade shortcoming, still has the heavy, difficult installation of weight and high scheduling problem of breakage rate, and to a great extent has restricted double-glass assembly's development. At present, the transparent back plate single glass assembly can also realize double-sided power generation, and the transparent back plate single glass assembly has the characteristics of light weight, easiness in installation and transportation, high production process compatibility and high process yield, so that the preparation of the transparent back plate assembly becomes an important research direction for double-sided power generation.
CN110885593A discloses a transparent coating for photovoltaic back sheets and a photovoltaic back sheet. The transparent coating comprises a solid component and a solvent, wherein the solid component comprises: the weather-resistant resin containing hydroxyl, inorganic filler, oligomer alkane coupling agent and curing agent. The photovoltaic backboard comprises a transparent substrate layer and a transparent coating layer arranged on the transparent substrate layer, wherein the transparent coating layer is formed by curing the transparent coating for the photovoltaic backboard. The coating has good weather resistance and visible light transparency, and can be firmly bonded with a packaging adhesive film of a photovoltaic module without corona.
CN109054531A discloses a weather-resistant transparent coating and application thereof, wherein the weather-resistant transparent coating is composed of fluorocarbon resin, modified resin, a first auxiliary agent, inorganic filler, an organic solvent, a second auxiliary agent, a curing agent and a catalyst. The transparent coating has high light transmittance, excellent cohesiveness, insulativity, ultraviolet resistance and humidity and heat aging resistance, can be used for preparing a photovoltaic back plate, and can meet the reliability requirement of a photovoltaic module in outdoor long-term use.
Based on the research, the transparent back plate has good weather resistance, wear resistance and other functions compared with inorganic materials such as a double-glass assembly, but has no obvious advantage on product competitiveness, and the light conversion function is taken as the maximum concern point of the photovoltaic industry, so that harmful ultraviolet light can be converted into infrared light, the power of a terminal product is improved, the income is increased, and therefore, the light conversion coating is found, so that the photovoltaic transparent back plate has the light conversion function, and the practical significance is great for the photovoltaic industry.
Disclosure of Invention
Aiming at the defects in the prior art and the actual needs, the invention aims to provide a light conversion transparent coating for a photovoltaic back plate and a preparation method and application thereof. The light conversion transparent coating can be used for preparing a photovoltaic backboard, so that the photovoltaic backboard has a light conversion function, harmful ultraviolet light is converted into infrared light, the power of a terminal product is improved, and the income is increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a light conversion transparent coating for a photovoltaic back panel, comprising, in parts by weight: 70-100 parts of main body resin, 5-8 parts of adhesion promoter, 0.1-1 part of flatting agent, 0.3-1 part of dispersing agent, 5-10 parts of ultraviolet assistant, 5-25 parts of ultraviolet shielding agent, 1-10 parts of light conversion nano assistant, 5-20 parts of polyisocyanate curing agent and 10-60 parts of solvent.
The light conversion transparent coating disclosed by the invention is matched and used by the components, so that the coating has an excellent light conversion function, harmful ultraviolet light can be converted into infrared light, and the light conversion transparent coating is coated on the surface of a base material of a photovoltaic backboard, so that the photovoltaic backboard has the light conversion function, the power of a terminal product is improved, and the benefit is increased.
The 70-100 parts can be 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 96 parts, 98 parts or 100 parts and the like.
The 5 to 8 parts may be 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts, 6.2 parts, 6.4 parts, 6.6 parts, 6.8 parts, 7 parts, 7.2 parts, 7.4 parts, 7.6 parts, 7.8 parts or 8 parts, etc.
The amount of the above-mentioned 0.1 to 1 part may be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.
The amount of the above-mentioned 0.3 to 1 part may be 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.
The amount of the above-mentioned 5-10 parts may be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, etc.
The amount of the above-mentioned 5 to 25 parts may be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts, 19 parts, 21 parts, 23 parts or 25 parts, etc.
The 1-10 parts can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts and the like.
The 5-20 parts can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts and the like.
The 10-60 parts can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts and the like.
Other point values within the above range can be selected, and are not described in detail herein.
The main resin (containing hydroxyl group) is a continuous phase in the coating layer as a main component of the light conversion clear coating, can perform a crosslinking reaction with a polyisocyanate curing agent (containing isocyanate group) to form a network structure, and plays a main role in the physical and chemical properties of the coating layer.
The adhesion promoter can form stable chemical bonds (including van der waals force, hydrogen bonds and the like) with a Polyethylene terephthalate (PET) substrate of the photovoltaic back sheet, so that the coating can resist wet and hot erosion and is not easy to separate from the substrate.
The leveling agent can promote the coating to form a flat and uniform coating in the drying process, improve the permeability of the coating to a base material and reduce appearance defects generated in the coating process.
One end of an active group of the dispersing agent can be adsorbed on the surface of crushed nano particles (including light conversion nano auxiliary agents and ultraviolet shielding agents), and the other end of the active group is solvated to form an adsorption layer, so that repulsion force can be generated between the nano particles, the nano particles are guaranteed to be stably dispersed in the coating, and the storage stability of the prepared coating is guaranteed.
The ultraviolet auxiliary agent can absorb ultraviolet rays, stabilize generated free radicals and prevent organic components (such as main resin, adhesion promoter and the like) in the coating from being damaged and degraded by the ultraviolet rays.
The ultraviolet screening agent (mainly nanoparticles) can screen ultraviolet rays, and the size of the ultraviolet screening agent is equivalent to or smaller than that of light waves, so that the generated size effect enables the interval between a conduction band and a valence band to be increased, and the sunlight absorption at 400-1100nm is obviously enhanced.
The light conversion nano-additive is compatible with the main resin and stably dispersed in the coating, and after a period of time, the light conversion nano-additive can migrate to the surface of the coating due to low surface energy, so that harmful ultraviolet light can be converted into red light during sunlight irradiation, and the transmittance of the 400-1100nm solar light is increased.
The polyisocyanate curing agent contains isocyanate groups and can react with hydroxyl groups of components (such as main body resin and adhesion promoters) in the coating, so that the coating is heated, crosslinked and cured to form an interpenetrating network structure.
The solvent can well dissolve organic reactants to form a homogeneous system, so that the reaction is smoothly carried out.
In the invention, the main resin comprises any one or combination of at least two of FEVE fluorocarbon resin, modified FEVE fluorocarbon resin, ETFE resin, modified ETFE resin, epoxy resin, polyester resin or hydroxy acrylic resin, the combination of at least two of the FEVE fluorocarbon resin and the ETFE fluororesin or the combination of the ETFE fluororesin and the epoxy resin can be selected, and the modes of any other groups can be selected, which is not described in detail herein, and preferably, the FEVE fluorocarbon resin and/or the modified FEVE fluorocarbon resin.
The FEVE fluorocarbon resin and/or the modified FEVE fluorocarbon resin is preferable as the main resin in the present invention because the C — F bond energy is large, the carbon skeleton can be protected from ultraviolet ray damage, and the weather resistance is excellent.
In the invention, the adhesion promoter comprises any one or combination of at least two of modified polyester resin, modified hydroxy acrylic resin, modified polyether resin, epoxy phosphate ester or silane coupling agent, the combination of at least two of the modified polyester resin and the modified hydroxy acrylic resin or the combination of the modified polyether resin and the epoxy phosphate ester can be selected, and the combination of the rest of the modified polyester resin and the modified polyether resin can be selected, and is not described in detail herein, preferably the combination of the modified polyester resin and the modified polyether resin.
In the invention, the leveling agent comprises any one or a combination of at least two of an acrylic leveling agent, an organosilicon leveling agent and a fluorocarbon leveling agent, the combination of at least two of the acrylic leveling agent and the organosilicon leveling agent or the combination of the organosilicon leveling agent and the fluorocarbon leveling agent can be selected, and the modes of the rest arbitrary combinations can be selected, which is not repeated herein.
In the invention, the dispersant comprises any one or combination of at least two of a polymer type hyperdispersant, a controlled free radical type hyperdispersant, an anionic dispersant, a cationic dispersant or an electric neutral dispersant, the combination of at least two can be the combination of the polymer type hyperdispersant and the controlled free radical type hyperdispersant or the combination of the cationic dispersant and the electric neutral dispersant, and the like, and the combination of the rest can be selected, so that the details are not repeated.
In the invention, the ultraviolet auxiliary agent comprises any one or a combination of at least two of salicylate ultraviolet auxiliary agents, benzophenone ultraviolet auxiliary agents, benzotriazole ultraviolet auxiliary agents, substituted acrylonitrile ultraviolet auxiliary agents or triazine ultraviolet auxiliary agents, the combination of at least two of the salicylate ultraviolet auxiliary agents and the benzophenone ultraviolet auxiliary agents or the combination of the substituted acrylonitrile ultraviolet auxiliary agents and the triazine ultraviolet auxiliary agents can be selected, and the combination of the rest of the combination can be selected optionally.
Any one or the combination of at least two of benzotriazole ultraviolet additives and triazine ultraviolet additives, namely benzophenone ultraviolet additives is preferably used as the ultraviolet additive, and the ultraviolet additive has the advantages of wide spectrum waveband range, more ultraviolet wavebands capable of being absorbed and capability of effectively reducing the damage of ultraviolet rays to a coating.
In the invention, the ultraviolet shielding agent comprises any one or combination of at least two of nano silicon dioxide, nano zinc oxide, nano aluminum oxide, nano titanium oxide or modified wax powder, the combination of at least two of the nano silicon dioxide and the nano zinc oxide or the combination of the nano zinc oxide and the nano aluminum oxide can be selected, and the combination of the rest can be selected, and is not repeated herein.
In the invention, the light conversion nano auxiliary agent comprises any one or combination of at least two of lanthanum oxide nanoparticles, europium oxide nanoparticles, zirconium oxide nanoparticles, gadolinium oxide nanoparticles, yttrium oxide nanoparticles, dysprosium oxide nanoparticles, cerium oxide nanoparticles or neodymium oxide nanoparticles, the combination of at least two of lanthanum oxide nanoparticles and europium oxide nanoparticles or the combination of europium oxide nanoparticles and zirconium oxide nanoparticles can be selected, the combination of the rest of the combination can be selected, and the combination is not repeated any more, preferably, any one or combination of at least two of europium oxide nanoparticles, yttrium oxide nanoparticles or cerium oxide nanoparticles, and further preferably, the combination of europium oxide nanoparticles and yttrium oxide nanoparticles.
In the invention, any one or the combination of at least two of europium oxide nano-particles, yttrium oxide nano-particles or cerium oxide nano-particles is preferably used as the light conversion nano-additive, because the light conversion waveband is appropriate, and the absorbed ultraviolet waveband is the waveband to be shielded, is converted into the light of a long waveband, and can be effectively utilized by the solar cell.
In the present invention, the polyisocyanate curing agent includes any one or a combination of at least two of Hexamethylene Diisocyanate (HDI) trimer, Toluene Diisocyanate (TDI), diphenylmethane 4,4' -Diisocyanate (MDI), hydrogenated Xylylene Diisocyanate (Takenate 600, H6XDI) adduct or Xylylene Diisocyanate (XDI) adduct, and the combination of at least two of these may be a combination of HDI trimer and TDI or a combination of TDI and MDI, and the combination of the rest may be selected, and thus, description thereof is omitted.
The H6XDI adduct refers to a cycloaliphatic diisocyanate.
The XDI adduct refers to m-xylylene isocyanate.
In a second aspect, the present invention provides a preparation method of the light conversion clear coating for the photovoltaic back sheet according to the first aspect, wherein the preparation method comprises the following steps:
(1) preparing dispersion slurry: uniformly mixing a solvent, a dispersant and an ultraviolet shielding agent to obtain dispersion slurry;
(2) preparing a semi-finished paint product: uniformly mixing the main body resin, the flatting agent, the adhesion promoter, the ultraviolet assistant and the light conversion nano assistant, then adding the dispersion slurry prepared in the step (1), and dispersing to obtain a paint semi-finished product;
(3) preparing a finished coating product: and (3) uniformly mixing the semi-finished paint obtained in the step (2) with a polyisocyanate curing agent to obtain the light conversion transparent paint for the photovoltaic backboard.
Preferably, the mixing manner in step (1) is stirring, the stirring speed is 2000-3000r/min, and the stirring time is 30-60 min.
The 2000-3000r/min can be 2000r/min, 2100r/min, 2200r/min, 2300r/min, 2400r/min, 2500r/min, 2600r/min, 2700r/min, 2800r/min, 2900r/min or 3000 r/min.
The time period of 30-60min can be 30min, 32min, 34min, 36min, 38min, 40min, 42min, 44min, 46min, 48min, 50min, 52min, 54min, 56min, 58min or 60 min.
Other point values within the above range can be selected, and are not described in detail herein.
Preferably, the dispersing manner in the step (2) is stirring, the stirring speed is 2000-3000r/min, and the stirring time is 60-120 min.
The 2000-3000r/min can be 2000r/min, 2100r/min, 2200r/min, 2300r/min, 2400r/min, 2500r/min, 2600r/min, 2700r/min, 2800r/min, 2900r/min or 3000 r/min.
The time period of 60-120min can be 60min, 65min, 70min, 75min, 80min, 85min, 90min, 95min, 100min, 105min, 110min, 115min or 120 min.
Other point values within the above range can be selected, and are not described in detail herein.
In a third aspect, the invention provides a use of the light conversion clear coat for a photovoltaic backsheet according to the first aspect for the preparation of a photovoltaic backsheet.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, under the condition that the structure and the production process of the photovoltaic backboard are not changed, the light conversion nano auxiliary agent in the light conversion transparent coating has an excellent light conversion function, harmful ultraviolet light can be converted into infrared light, the solar light transmittance is increased, the photovoltaic backboard has the light conversion function by coating the coating on the surface of the base material of the photovoltaic backboard, the power of a terminal product is improved, the income is increased, and meanwhile, the weather resistance of the photovoltaic backboard can not be reduced.
Drawings
FIG. 1 is a schematic structural view of a PET single-coated article to which the present invention relates;
wherein, 1 is PET substrate, 2 is light conversion transparent coating, and 3 is light conversion nanometer auxiliary agent.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The following examples are presented as follows:
wherein the modified FEVE fluorocarbon resin is available from Mitsui corporation, Japan; FEVE fluorocarbon resin was purchased from Japan Dajin Industrial Co Ltd; the modified polyester resin was purchased from Toyo Boseki Kabushiki Kaisha; the modified polyether resin was purchased from asahi glass company; phosphate esters were purchased from bunpu chemical ltd; silane coupling agents were purchased from Chinese academy; the acrylic leveling agent, the fluorocarbon leveling agent and the organic silicon leveling agent are all purchased from BASF group Limited company; the polymeric hyperdispersant was purchased from basf group ltd; benzophenone ultraviolet auxiliary agents, salicylate ultraviolet auxiliary agents and benzotriazole ultraviolet auxiliary agents are all purchased from Taiwan Yongguang Co., Ltd; modified polyethylene wax powder was purchased from clariant corporation; the nano silicon oxide, the nano zinc oxide and the nano titanium oxide are all purchased from Kane chemical Co., Ltd; europium oxide nanoparticles, yttrium oxide nanoparticles, and cerium oxide nanoparticles were purchased from Sigma-Aldrich, ltd. The remaining materials and starting materials are not specifically described and are commercially available from other sources.
Example 1
The embodiment provides a light conversion transparent coating for a photovoltaic back plate, which comprises the following components in parts by weight:
the preparation method comprises the following steps:
(1) preparing dispersion slurry: weighing a solvent and a dispersant according to the formula amount, mixing, stirring uniformly at 2500r/min, adding the ultraviolet shielding agent according to the formula amount for 3 times, and keeping for 40min at 2500r/min to obtain dispersion slurry;
(2) preparing a semi-finished paint product: weighing and mixing the main resin, the leveling agent, the adhesion promoter, the ultraviolet assistant and the light conversion nano assistant according to the formula ratio, uniformly stirring at 3000r/min, then adding the dispersion slurry prepared in the step (1), and dispersing for 90min at 3000r/min to obtain a semi-finished paint product;
(3) preparing a finished coating product: and (3) adding a polyisocyanate curing agent in a formula amount into the paint semi-finished product obtained in the step (2), and uniformly stirring to obtain the light conversion transparent paint.
Example 2
The embodiment provides a light conversion transparent coating for a photovoltaic back plate, which comprises the following components in parts by weight:
the preparation method comprises the following steps:
(1) preparing dispersion slurry: weighing a solvent and a dispersant according to the formula amount, mixing, uniformly stirring at 2000r/min, adding the ultraviolet shielding agent according to the formula amount for 3 times, and keeping the mixture at 2000r/min for 50min to obtain dispersion slurry;
(2) preparing a semi-finished paint product: weighing and mixing the main resin, the leveling agent, the adhesion promoter, the ultraviolet assistant and the light conversion nanometer assistant according to the formula ratio, uniformly stirring at 2800r/min, then adding the dispersion slurry prepared in the step (1), and dispersing for 100min at 2800r/min to obtain a semi-finished paint product;
(3) preparing a finished coating product: and (3) adding a polyisocyanate curing agent in a formula amount into the paint semi-finished product obtained in the step (2), and uniformly stirring to obtain the light conversion transparent paint.
Example 3
The embodiment provides a light conversion transparent coating for a photovoltaic back plate, which comprises the following components in parts by weight:
the preparation method comprises the following steps:
(1) preparing dispersion slurry: weighing a solvent and a dispersant according to the formula amount, mixing, uniformly stirring at 3000r/min, then adding the ultraviolet shielding agent according to the formula amount for 3 times, and keeping for 35min at 3000r/min to obtain dispersion slurry;
(2) preparing a semi-finished paint product: weighing and mixing the main resin, the leveling agent, the adhesion promoter, the ultraviolet assistant and the light conversion nano assistant according to the formula ratio, uniformly stirring at 3000r/min, then adding the dispersion slurry prepared in the step (1), and dispersing for 80min at 3000r/min to obtain a semi-finished paint product;
(3) preparing a finished coating product: and (3) adding a polyisocyanate curing agent in a formula amount into the paint semi-finished product obtained in the step (2), and uniformly stirring to obtain the light conversion transparent paint.
Example 4
This example provides a light converting clear coat for photovoltaic back sheets that differs from example 1 only in that the modified FEVE fluorocarbon resin is replaced with an equal amount of epoxy resin, with the remaining parameters being consistent with example 1. The preparation process is referred to example 1.
Example 5
This example provides a light converting clear coat for photovoltaic back sheets that differs from example 1 only in that the modified FEVE fluorocarbon resin is replaced with a hydroxy acrylic resin in equal amounts, with the remaining parameters being consistent with example 1. The preparation process is referred to example 1.
Example 6
This example provides a light conversion clear coating for photovoltaic back sheets, which differs from example 1 only in that the benzotriazole-based uv additive is replaced with benzophenone-based uv additive in equal amount, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Example 7
This example provides a light conversion clear coating for photovoltaic back sheets, which differs from example 1 only in that the benzotriazole-based uv additive is replaced with a salicylate-based uv additive in equal amounts, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Example 8
This example provides a light conversion clear coating for photovoltaic back panels, which is different from example 1 only in that the salicylate ultraviolet auxiliary is replaced with benzotriazole ultraviolet auxiliary in an equal amount, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Example 9
This example provides a light-converting clear coating for photovoltaic back sheets, which differs from example 1 only in that the europium oxide nanoparticles are replaced with zirconium oxide nanoparticles in equal amounts, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Example 10
This example provides a light conversion clear coating for photovoltaic back sheets, which differs from example 1 only in that the yttrium oxide nanoparticles are replaced with lanthanum oxide nanoparticles in equal amount, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Example 11
This example provides a light-converting clear coating for photovoltaic back sheets, which differs from example 1 only in that the modified polyester resin is replaced with a modified hydroxy acrylic resin in equal amounts, and the remaining parameters are in accordance with example 1. The preparation process is referred to example 1.
Example 12
This example provides a light-converting clear coating for photovoltaic back sheets, which differs from example 1 only in that the modified polyether resin is replaced with a modified hydroxy acrylic resin in equal amounts, and the remaining parameters are consistent with example 1. The preparation process is referred to example 1.
Comparative example 1
The comparison example provides a light conversion transparent coating for a photovoltaic back panel, which is different from the example 1 only in that the europium oxide nanoparticles are equivalently replaced by sulfur indium copper fluorescent quantum dots, and the other parameters are consistent with the example 1. The preparation process is referred to example 1.
Comparative example 2
The comparison example provides a light conversion transparent coating for a photovoltaic back panel, which is different from the example 1 only in that the yttrium oxide nano particles are equivalently replaced by sulfur indium copper fluorescent quantum dots, and the other parameters are consistent with the example 1. The preparation process is referred to example 1.
Comparative example 3
This comparative example provides a light converting clear coat for a photovoltaic backsheet, differing from example 1 only in that the light converting clear coat does not comprise a light converting nanoadditive, the remaining parameters remaining in accordance with example 1. The preparation process is referred to example 1.
Application example 1
The application example provides a PET single-coated product, wherein the surface of a base material of the PET single-coated product is coated with the light conversion transparent coating prepared in the example 1, and the thickness of the coating is 21 mu m. The structural schematic diagram of the PET substrate coated with the light conversion transparent coating is shown in fig. 1, wherein 1 is the PET substrate, 2 is the light conversion transparent coating, and 3 is the light conversion nano-additive.
Application example 2
The application example provides a PET single-coated product, wherein the surface of a base material of the PET single-coated product is coated with the light conversion transparent coating prepared in the example 2, and the thickness of the coating is 20 microns.
Application examples 3 to 12
This application example provides 10 PET monocoats, differing from example 1 only in that the light converting clear coat prepared in example 1 was replaced with the light converting clear coat prepared in examples 3-12. The remaining parameters were in accordance with application example 1.
Comparative application examples 1 to 3
This comparative application example provides a PET monocoat, differing from example 1 only in that the light-converting clear coat prepared in example 1 was replaced with the light-converting clear coat prepared in comparative examples 1-3. The remaining parameters were in accordance with application example 1.
Test example 1
The test example tests the light wave transmittance of different wavelengths of the PET single-coated product prepared in the application examples 1-12 and the comparative application examples 1-3, and the test method is as follows:
testing according to GB2410-80 transparent plastic light transmittance and haze test method;
the statistics of the test results are shown in table 1 below:
TABLE 1
| Group of | 280-400nm transmittance (%) | 400-1100nm transmittance (%) |
| Example 1 | 5.6 | 91.2 |
| Example 2 | 7.1 | 90.5 |
| Example 3 | 8.2 | 89.8 |
| Example 4 | 6.0 | 85.2 |
| Example 5 | 6.2 | 84.8 |
| Example 6 | 9.3 | 86.7 |
| Example 7 | 10.2 | 87.2 |
| Example 8 | 9.0 | 87.1 |
| Example 9 | 6.4 | 87.7 |
| Example 10 | 6.9 | 87.3 |
| Example 11 | 5.6 | 86.8 |
| Example 12 | 5.6 | 85.9 |
| Comparative example 1 | 5.9 | 83.6 |
| Comparative example 2 | 5.9 | 82.9 |
| Comparative example 3 | 10.3 | 79.7 |
| Blank control group | 13.7 | 76.5 |
As can be seen from the data in the table above, the PET single-coated product obtained by coating the light conversion transparent coating provided by the invention on the surface of the PET base material has excellent light conversion performance, and can reduce the infrared light transmittance and increase the solar light transmittance. Among them, examples 4 to 12 and comparative examples 1 to 2 show that: the selection of the main resin, the ultraviolet assistant and the light conversion nanometer assistant can influence the light conversion performance of the PET single coating.
Test example 2
The test example tests the weather resistance of the PET single-coated product prepared in the application examples 1 to 12, and the test method is as follows:
testing is carried out according to GBT 1767-1979 "determination of weather resistance of paint film";
the statistics of the test results are shown in table 2 below:
TABLE 2
From the above table data, it can be seen that: the light conversion transparent coating provided by the invention is coated on the surface of a PET substrate, and cannot influence the weather resistance of a PET single coating product.
According to the invention, under the condition that the structure and the production process of the photovoltaic backboard are not changed, the light conversion nano auxiliary agent in the light conversion transparent coating has an excellent light conversion function, harmful ultraviolet light can be converted into infrared light, the solar light transmittance is increased, and the coating is coated on the surface of the base material of the photovoltaic backboard, so that the photovoltaic backboard has the light conversion function, the power of a terminal product is improved, the income is increased, and meanwhile, the weather resistance of the photovoltaic backboard can not be reduced.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The light conversion transparent coating for the photovoltaic back plate is characterized by comprising the following components in parts by weight: 70-100 parts of main body resin, 5-8 parts of adhesion promoter, 0.1-1 part of flatting agent, 0.3-1 part of dispersing agent, 5-10 parts of ultraviolet assistant, 5-25 parts of ultraviolet shielding agent, 1-10 parts of light conversion nano assistant, 5-20 parts of polyisocyanate curing agent and 10-60 parts of solvent.
2. The light conversion clear coat for photovoltaic back sheets according to claim 1, wherein the host resin comprises any one or a combination of at least two of FEVE fluorocarbon resin, modified FEVE fluorocarbon resin, ETFE resin, modified ETFE resin, epoxy resin, polyester resin or hydroxy acrylic resin, preferably FEVE fluorocarbon resin and/or modified FEVE fluorocarbon resin.
3. The light conversion clear coating for the photovoltaic back sheet according to claim 1 or 2, wherein the adhesion promoter comprises any one or a combination of at least two of modified polyester resin, modified hydroxy acrylic resin, modified polyether resin, epoxy phosphate ester or silane coupling agent, preferably a combination of modified polyester resin and modified polyether resin;
preferably, the leveling agent comprises any one of an acrylic leveling agent, an organosilicon leveling agent or a fluorocarbon leveling agent or a combination of at least two of the foregoing;
preferably, the dispersant includes any one of a polymeric hyperdispersant, a controlled radical hyperdispersant, an anionic dispersant, a cationic dispersant or an electrically neutral dispersant, or a combination of at least two thereof.
4. The light conversion clear coating for a photovoltaic back sheet according to any one of claims 1 to 3, wherein the UV auxiliary comprises any one or a combination of at least two of a salicylate-based UV auxiliary, a benzophenone-based UV auxiliary, a benzotriazole-based UV auxiliary, a substituted acrylonitrile-based UV auxiliary or a triazine-based UV auxiliary, preferably any one or a combination of at least two of a benzotriazole-based UV auxiliary, a salicylate-based UV auxiliary or a triazine-based UV auxiliary, and further preferably a combination of a benzotriazole-based UV auxiliary and a salicylate-based UV auxiliary;
preferably, the ultraviolet shielding agent comprises any one or a combination of at least two of nano silicon dioxide, nano zinc oxide, nano aluminum oxide, nano titanium oxide or modified wax powder.
5. The light conversion transparent coating for a photovoltaic back sheet according to any one of claims 1 to 4, wherein the light conversion nanoadditive comprises any one or a combination of at least two of lanthanum oxide nanoparticles, europium oxide nanoparticles, zirconium oxide nanoparticles, gadolinium oxide nanoparticles, yttrium oxide nanoparticles, dysprosium oxide nanoparticles, cerium oxide nanoparticles or neodymium oxide nanoparticles, preferably any one or a combination of at least two of europium oxide nanoparticles, yttrium oxide nanoparticles or cerium oxide nanoparticles, and further preferably a combination of europium oxide nanoparticles and yttrium oxide nanoparticles.
6. The light conversion clear coating for photovoltaic backsheet according to any one of claims 1 to 5, characterized in that the polyisocyanate curing agent comprises any one or a combination of at least two of HDI trimer, TDI, MDI, H6XDI adduct or XDI adduct.
7. A method for preparing a light-converting clear coating for a photovoltaic backsheet according to any one of claims 1 to 6, characterized in that it comprises the following steps:
(1) preparing dispersion slurry: uniformly mixing a solvent, a dispersant and an ultraviolet shielding agent to obtain dispersion slurry;
(2) preparing a semi-finished paint product: uniformly mixing the main body resin, the flatting agent, the adhesion promoter, the ultraviolet assistant and the light conversion nano assistant, then adding the dispersion slurry prepared in the step (1), and dispersing to obtain a paint semi-finished product;
(3) preparing a finished coating product: and (3) uniformly mixing the semi-finished paint obtained in the step (2) with a polyisocyanate curing agent to obtain the light conversion transparent paint for the photovoltaic backboard.
8. The method as claimed in claim 7, wherein the mixing in step (1) is performed by stirring at a speed of 2000-3000r/min for 30-60 min.
9. The method for preparing a light conversion transparent coating for a photovoltaic back panel as claimed in claim 7 or 8, wherein the dispersing manner in step (2) is stirring, the stirring speed is 2000-3000r/min, and the stirring time is 60-120 min.
10. Use of a light-converting clear coating for a photovoltaic backsheet according to any one of claims 1 to 6 for the preparation of a photovoltaic backsheet.
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