CN109888042B - Solar cell back plate and preparation method thereof - Google Patents
Solar cell back plate and preparation method thereof Download PDFInfo
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- CN109888042B CN109888042B CN201811608153.9A CN201811608153A CN109888042B CN 109888042 B CN109888042 B CN 109888042B CN 201811608153 A CN201811608153 A CN 201811608153A CN 109888042 B CN109888042 B CN 109888042B
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a solar cell backboard and a preparation method thereof, and the solar cell backboard comprises an intermediate base layer, wherein the inner surface and the outer surface of the intermediate base layer are coated with coatings, the surface of the intermediate base layer, which is in contact with a cell, is coated with a first coating, the surface of the intermediate base layer, which is in contact with air, is coated with a second coating, and the first coating contains an adsorption filler; the adsorption filler comprises one or more of molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and metal-organic framework materials. Titanium dioxide and adsorption filler are used as fillers in the coating, the thickness of the coating is 12-100 microns, the coating is a thermosetting micron-sized fluororesin coating, and compared with the existing common solar cell backboard, the backboard has the function of adsorbing moisture in the atmosphere, harmful gas nitrogen oxides, sulfur dioxide and the like, so that the solar cell backboard not only has the function of improving the overall mechanical strength of the solar cell panel, but also has the function of environmental protection and air purification.
Description
Technical Field
The invention relates to the field of solar cells, in particular to an environment-friendly solar cell back plate based on a coating technology and a preparation method thereof.
Background
Due to the continuous use of fossil energy, the current environmental pollution is increasingly serious, toxic gases such as nitrogen oxides, sulfur dioxide and the like in the air are increased sharply, the greenhouse effect is gradually worsened, solar energy is increasingly concerned as a clean renewable energy source, and the solar power generation is used as a clean renewable new energy source to walk on an energy stage. In order to pursue return on investment for power generation of a solar cell module, a solar cell module is generally required to have a service life of 25 years. The solar cell panel is generally a laminated structure, and mainly comprises a glass surface layer, a sealing layer, a solar cell sheet, a sealing layer and a solar cell back plate, wherein the solar cell sheet is hermetically wrapped by the two sealing layers. The solar cell backboard is located at the outermost part of the whole solar cell module, so that the overall mechanical strength of the solar cell panel is improved, and the solar cell backboard can be in close contact with the atmosphere. However, the solar cell back sheet used today only considers its supporting function for the solar cell sheet and neglects the use of the back sheet contacting with the atmosphere, resulting in a waste of partial functions of the back sheet. Therefore, it is necessary to develop a back plate with environmental protection function.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an environment-friendly solar cell back plate based on a coating technology and a preparation method thereof, wherein the environment-friendly solar cell back plate can efficiently adsorb toxic gases such as nitric oxide, sulfur dioxide and the like in the atmosphere.
The invention provides a solar cell backboard, which adopts the main technical scheme that:
a solar cell backboard comprises an intermediate base layer, wherein the inner surface and the outer surface of the intermediate base layer are coated with coatings, a first coating is coated on one surface of the intermediate base layer, which is in contact with a cell, and a second coating is coated on one surface of the intermediate base layer, which is in contact with air, wherein the first coating contains adsorption filler;
the adsorption filler comprises one or more of molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and metal-organic framework materials.
Wherein the weight percentage of the adsorption filler in the total amount of the first coating raw material is 12-50 wt%.
Wherein, the first coating also comprises titanium dioxide, and the weight percentage of the titanium dioxide and the adsorption filler in the total amount of the raw materials of the first coating is 20-60 wt%.
Wherein, the middle base layer is PET or EVA.
Wherein, the first coating is formed by curing fluorocarbon paint taking functional fluororesin as main resin.
Wherein the functional fluororesin is a mixture of a reactive fluororesin and a non-reactive fluororesin, the reactive fluororesin is a product of copolymerization of a polymerizable fluorine-containing monomer and a hydroxyl-or amino-group-containing reactive monomer, and the non-reactive fluororesin is a homopolymer of the polymerizable fluorine-containing monomer or a copolymer thereof with a non-reactive functional monomer.
Wherein, the first coating also comprises the carbon nitride which accounts for 2 to 8 weight percent of the total weight of the raw materials of the first coating.
Wherein the first coating has a thickness of 12-100 microns; the thickness of the middle base layer is 0.2 mm-25 mm.
By using the solar cell back plate, titanium dioxide and adsorption filler are used as fillers in the coating, the thickness of the coating is 12-100 microns, and the coating is a thermosetting micron-sized fluororesin coating.
The invention provides a preparation method of a solar cell backboard, which comprises the following steps:
s1, taking 10-25 parts of titanium dioxide, 20-50 parts of adsorption filler, 32-50 parts of fluororesin, 1-3 parts of dispersant and 0-20 parts of diluent, putting into a grinding machine, uniformly mixing and grinding for 2-5 hours to prepare color paste;
s2, mixing an auxiliary agent and 10-15 parts of a diluent, 10-37 parts of a fluororesin, 5-15 parts of a curing agent and 30-50 parts of a color paste to prepare the coating.
S3, coating the paint prepared in the step S2 on one surface of the middle base layer, which is contacted with air, and carrying out curing treatment;
the adsorption filler comprises one or more of molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and metal-organic framework materials.
Wherein, 1-4 parts of carbon nitride is also added in the step S1.
The manufacturing method of the solar cell backboard does not change the existing coating process, and has high yield and low cost.
Drawings
Fig. 1 is a schematic structural diagram of a solar cell back sheet according to the present application.
Detailed Description
The present invention will be described in detail with reference to the following examples, which are intended to facilitate the understanding of the present invention and should not be construed as limiting in any way.
As shown in fig. 1, the solar cell back sheet provided by the invention comprises an intermediate base layer, wherein the inner surface and the outer surface of the intermediate base layer are coated with coatings, the surface of the intermediate base layer, which is in contact with a cell, is coated with a first coating, and the surface of the intermediate base layer, which is in contact with air, is coated with a second coating, wherein the first coating contains an adsorption filler;
the adsorption filler comprises one or more of molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and metal-organic framework materials. Preferably, the adsorption filler is a molecular sieve, wherein the physical property specific surface area, the pore size and the distribution of the molecular sieve can be controllably adjusted according to adsorbed target molecules; the chemical groups of the molecular sieve can also be designed and adjusted according to the target molecule to be adsorbed. The adsorption of the molecular sieve to the target molecule may be physical adsorption or chemical adsorption, or a combination thereof. The molecular sieve has a specific microporous structure and functional groups, and can selectively and functionally adsorb target molecules such as nitrogen oxide, sulfur dioxide and the like. Wherein, the special structure and function can respectively refer to the impregnation of Y-type zeolite molecular sieve or FSBA-15 and SBA-15 impregnated with polyethyleneimine by using Tetraethylenepentamine (TEPA). The "chemical group" may be: hydroxyl, amino, and the like.
Wherein the weight percentage of the adsorption filler in the total amount of the first coating raw material is 12-50 wt%.
Wherein, the first coating also comprises titanium dioxide, and the weight percentage of the titanium dioxide and the adsorption filler in the total amount of the raw materials of the first coating is 20-60 wt%.
The solar cell backboard of the embodiment is used, titanium dioxide and adsorption filler are used as filler in the coating, and compared with the existing common solar cell backboard, the backboard has the functions of adsorbing moisture in the atmosphere and harmful gas nitrogen oxides, sulfur dioxide and the like, so that the solar cell backboard not only plays a role in improving the overall mechanical strength of the solar cell panel, but also has the functions of environmental protection and air purification.
Wherein the first coating thickness is from 12 microns to 100 microns.
The coating also comprises a curing agent, wherein the curing agent is a reactant which can be crosslinked and cured with reactive fluorine.
Wherein, the coating can be single-component or double-component. The curing mechanism may be a polycondensation or an addition reaction.
Wherein, the middle base layer is PET or EVA. Preferably, the intermediate substrate is PET having a thickness of 0.2 mm to 25 mm.
Wherein, the first coating is formed by curing fluorocarbon paint taking functional fluororesin as main resin.
Wherein the functional fluororesin is a mixture of a reactive fluororesin and a non-reactive fluororesin, the reactive fluororesin is a product of copolymerization of a polymerizable fluorine-containing monomer and a hydroxyl-or amino-group-containing reactive monomer, and the non-reactive fluororesin is a homopolymer of the polymerizable fluorine-containing monomer or a copolymer thereof with a non-reactive functional monomer.
Wherein, the first coating also comprises the carbon nitride which accounts for 2 to 8 weight percent of the total weight of the raw materials of the first coating.
The preparation method of the solar cell back plate provided by the embodiment comprises the following steps:
s1, taking 10-25 parts of titanium dioxide, 20-50 parts of adsorption filler, 32-50 parts of fluororesin, 1-3 parts of dispersant and 0-20 parts of diluent, putting into a grinding machine, uniformly mixing and grinding for 2-5 hours to prepare color paste;
s2, mixing an auxiliary agent and 10-15 parts of a diluent, 10-37 parts of a fluororesin, 5-15 parts of a curing agent and 30-50 parts of a color paste to prepare the coating.
And S3, coating the paint prepared in the step S2 on the surface of the intermediate base layer, which is contacted with the air, and curing.
The adsorption filler comprises one or more of molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and metal-organic framework materials.
Wherein, 1-4 parts of carbon nitride is also added in the step S1.
By using the manufacturing method of the solar cell backboard of the embodiment, the existing coating process is not changed, the yield is high, and the cost is low.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
1. Color paste preparation: taking 20 parts of titanium dioxide, 30 parts of molecular sieve, 35 parts of fluororesin, 2 parts of dispersant and 13 parts of diluent, grinding for 10-30 times by using a ball mill, testing the grinding fineness to be 13 micrometers by using a scraper fineness agent, and placing the color paste at room temperature for later use.
2. Preparing the coating: and (2) taking 35 parts of fluororesin, 40 parts of the color paste prepared in the step (1), 15 parts of curing agent, 10 parts of auxiliary agent and diluent, dispersing at high speed by using a dispersion machine, and placing the uniformly dispersed coating at room temperature for later use.
3. And (3) coating the uniformly stirred coating in the step (2) on one surface of the PET, which is in contact with air, by using a coating technology, and drying the coated solar cell back panel.
4. Placing the solar cell backboard prepared in the step 3 into a closed container containing gases such as nitrogen oxide, sulfur dioxide and the like, and measuring the initial concentration of the gases such as the nitrogen oxide, the sulfur dioxide and the like to be 42.1mg/m3After 24h, the concentration of nitrogen oxide, sulfur dioxide and other gases is measured again at 35.4mg/m3。
Example 2
1. Color paste preparation: taking 10 parts of titanium dioxide, 40 parts of molecular sieve, 35 parts of fluororesin, 2 parts of dispersant and 13 parts of diluent, grinding for 10-30 times by using a ball mill, testing the grinding fineness to be 13 microns by using a scraper plate fineness agent, and placing the color paste at room temperature for later use.
2. Preparing the coating: and (2) taking 30 parts of fluororesin, 50 parts of the color paste prepared in the step (1), 10 parts of curing agent, 10 parts of auxiliary agent and diluent, dispersing at high speed by using a dispersion machine, and placing the uniformly dispersed coating at room temperature for later use.
3. And (3) coating the uniformly stirred coating in the step (2) on one surface of the PET, which is in contact with air, by using a coating technology, and drying the coated solar cell back panel.
4. Placing the solar cell backboard prepared in the step 3 into a closed container containing gases such as nitrogen oxide, sulfur dioxide and the like, and measuring the initial concentration of the gases such as the nitrogen oxide, the sulfur dioxide and the like to be 39.8mg/m3After 24h, the concentration of nitrogen oxide, sulfur dioxide and other gases is measured again and measured to be 20.5mg/m3。
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The solar cell backboard is characterized by comprising an intermediate base layer, wherein the inner surface and the outer surface of the intermediate base layer are coated with coatings, a first coating is coated on one surface of the intermediate base layer, which is in contact with a cell, and a second coating is coated on one surface of the intermediate base layer, which is in contact with air, and the first coating contains adsorption filler;
the adsorption filler comprises one or more of a molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and a metal-organic framework material;
the adsorption filler adsorbs target molecules through physical action and/or chemical action, wherein the physical action realizes the adsorption of the target molecules through the adjustment of the contrast surface area, the pore size and the distribution, and the chemical adsorption adsorbs the target molecules by introducing chemical groups into the material; the target molecules comprise water molecules, nitrogen oxides and sulfur dioxide in the atmosphere;
the first coating is formed by curing fluorocarbon coating taking functional fluororesin as main resin;
the functional fluororesin is a mixture of a reactive fluororesin and a non-reactive fluororesin, the reactive fluororesin is a product of copolymerization of a polymerizable fluorine-containing monomer and a hydroxyl-or amino-group-containing reactive monomer, and the non-reactive fluororesin is a homopolymer of the polymerizable fluorine-containing monomer or a copolymer thereof with the non-reactive functional monomer.
2. The solar cell back sheet according to claim 1, wherein the weight percentage of the adsorptive filler to the total amount of the first coating raw material is 12 to 50 wt%.
3. The solar cell back sheet according to claim 1, wherein the first coating layer further comprises titanium dioxide, and the titanium dioxide and the adsorption filler together account for 20 to 60 wt% of the total amount of the raw materials of the first coating layer.
4. The solar cell backsheet according to claim 1, wherein the intermediate base layer is PET or EVA.
5. The solar cell back sheet according to claim 1, wherein the first coating layer further comprises carbon nitride, and the carbon nitride accounts for 2 to 8 wt% of the total amount of the raw materials of the first coating layer.
6. The solar cell backsheet as claimed in claim 1, wherein the thickness of the first coating layer is 12 to 100 μm; the thickness of the middle base layer is 0.2 mm-25 mm.
7. A preparation method of a solar cell backboard is characterized by comprising the following steps:
s1, taking 10-25 parts of titanium dioxide, 20-50 parts of adsorption filler, 32-50 parts of fluororesin, 1-3 parts of dispersant and 0-20 parts of diluent, putting into a grinding machine, uniformly mixing and grinding for 2-5 hours to prepare color paste;
s2, mixing an auxiliary agent and 10-15 parts of a diluent, 10-37 parts of a fluororesin, 5-15 parts of a curing agent and 30-50 parts of a color paste to prepare a coating;
s3, coating the paint prepared in the step S2 on one surface of the middle base layer, which is contacted with air, and carrying out curing treatment;
the adsorption filler comprises one or more of a molecular sieve, kaolin, zirconium powder, nano silicon dioxide, graphene and a metal-organic framework material;
the adsorption filler adsorbs target molecules through physical action and/or chemical action, wherein the physical action realizes the adsorption of the target molecules through the adjustment of the contrast surface area, the pore size and the distribution, and the chemical adsorption adsorbs the target molecules by introducing chemical groups into the material; the target molecules comprise water molecules, nitrogen oxides and sulfur dioxide in the atmosphere.
8. The method of claim 7, wherein 1 to 4 parts of carbon nitride is further added in step S1.
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| CN114369408B (en) * | 2021-12-14 | 2023-03-17 | 乐凯胶片股份有限公司 | Coating, colored film and photovoltaic module |
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| JP5262044B2 (en) * | 2007-09-27 | 2013-08-14 | 凸版印刷株式会社 | Solar cell back surface sealing sheet and solar cell module using the same |
| CN103045110A (en) * | 2012-12-21 | 2013-04-17 | 常州天合光能有限公司 | EVA adhesive film for packaging solar component and back panel of solar component |
| CN105449024B (en) * | 2015-12-26 | 2017-08-25 | 乐凯胶片股份有限公司 | A kind of high reflection solar cell backboard |
| CN106601853A (en) * | 2016-12-14 | 2017-04-26 | 苏州中来光伏新材股份有限公司 | Adhesive film integrated solar cell backboard with high thermal conductivity and preparation method and assembly |
| CN107254156A (en) * | 2017-06-09 | 2017-10-17 | 江苏东昇光伏科技有限公司 | A kind of preparation method of the floride-free backboard of solar cell |
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Effective date of registration: 20220622 Address after: 215500 Building 1, No. 32, Qingnian Road, Changkun Industrial Park, Shajiabang Town, Changshu City, Suzhou City, Jiangsu Province Patentee after: Jiangsu Zhonglai New Material Technology Co.,Ltd. Address before: 215542 Qingnian Road, Changkun Industrial Park, Shajiabang Town, Changshu City, Suzhou City, Jiangsu Province Patentee before: Jolywood (Suzhou) Sunwatt Co.,Ltd. |