CN112635603A - Transparent grid backboard of photovoltaic module and preparation method thereof - Google Patents
Transparent grid backboard of photovoltaic module and preparation method thereof Download PDFInfo
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- CN112635603A CN112635603A CN202110022468.0A CN202110022468A CN112635603A CN 112635603 A CN112635603 A CN 112635603A CN 202110022468 A CN202110022468 A CN 202110022468A CN 112635603 A CN112635603 A CN 112635603A
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- 239000011248 coating agent Substances 0.000 claims abstract description 60
- 238000000576 coating method Methods 0.000 claims abstract description 60
- 239000000843 powder Substances 0.000 claims abstract description 50
- 239000011521 glass Substances 0.000 claims abstract description 49
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 32
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- 239000001023 inorganic pigment Substances 0.000 claims abstract description 24
- 239000011247 coating layer Substances 0.000 claims abstract description 19
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- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 15
- 239000011737 fluorine Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000012780 transparent material Substances 0.000 claims abstract description 5
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- 229910052782 aluminium Inorganic materials 0.000 claims description 31
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
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- 238000003756 stirring Methods 0.000 claims description 16
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- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
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- 239000011787 zinc oxide Substances 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 6
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/049—Protective back sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/416—Reflective
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/12—Photovoltaic modules
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of photovoltaic cell assemblies, in particular to a transparent grid backboard of a photovoltaic assembly and a preparation method thereof, wherein the transparent grid backboard comprises a substrate made of a transparent material; the grid area is arranged on the substrate and is a high-reflection coating layer which is distributed in a grid shape in a two-dimensional array form; the high-reflection coating layer is formed by taking water-soluble acrylic resin as a connecting material, containing high-reflection inorganic pigment and glass powder inside and curing on the substrate; the outer surface of the high-reflection coating layer is in a regular sawtooth shape. The outer surface of the white grid structure area prepared by the invention has a regular sawtooth shape, and can directionally reflect incident light rays to the battery pieces on two sides of the outer grid structure; the white grid area has higher transmittance, so that the photovoltaic module is ensured to fully utilize sunlight, and the power generation power of the photovoltaic module is effectively improved; the fluorine film layer and the hardened coating are arranged, so that the photovoltaic module can be guaranteed to be used reliably outdoors for a long time.
Description
Technical Field
The invention relates to the technical field of photovoltaic cell assemblies, in particular to a transparent grid backboard of a photovoltaic assembly and a preparation method thereof.
Background
Double-sided power generation has been a recognized industry trend, and double-sided components will occupy over 40% of the market share by 2027 as predicted by research institutes. Conventional double-sided assemblies still use double-sided glass as the primary encapsulation material. The dual-glass assembly has the phenomena of high process difficulty, low yield and the like, and also has the problems of heavy weight, difficult installation, high breakage rate and the like, and the development of the dual-glass assembly is limited to a certain extent. The transparent back plate assembly can also realize double-sided power generation, and has the characteristics of light weight, easiness in installation and transportation, high production process compatibility, high process yield and the like, so that the transparent back plate assembly becomes an important technical direction for double-sided power generation. And adding a reflective grid coating in the gaps of the battery pieces of the transparent back plate to form the transparent grid back plate. The incident light at the grid can be reflected for the second time, the light entering amount of the front side of the battery piece is increased, and the power of the component is effectively improved. Therefore, the transparent grid back plate has a good application prospect.
Disclosure of Invention
In order to overcome the defects that the existing double-glass assembly has the phenomena of high process difficulty, low yield and the like, and also has the problems of heavy weight, difficulty in installation, high breakage rate and the like, the invention provides a transparent grid backboard of a photovoltaic assembly and a preparation method thereof, wherein the transparent grid backboard comprises a substrate made of transparent materials; the grid area is arranged on the substrate and is a high-reflection coating layer which is distributed in a grid shape in a two-dimensional array form; the high-reflection coating layer is formed by taking water-soluble acrylic resin as a connecting material, containing high-reflection inorganic pigment and glass powder inside and curing on the substrate; the outer surface of the high-reflection coating layer is in a regular sawtooth shape.
The technical scheme adopted by the invention for solving the technical problems is as follows: a transparent grid back plate of a photovoltaic module is characterized by comprising: a substrate; the grid area is arranged on the substrate and is a high-reflection coating layer which is distributed in a grid shape in a positive two-dimensional array form; the high-reflection coating layer is formed by taking water-soluble acrylic resin as a connecting material, containing high-reflection inorganic pigment and glass powder inside and curing on the substrate; the outer surface of the high-reflection coating layer is regularly sawtooth-shaped.
Further, the substrate is made of transparent material.
Further, still be provided with on the base plate and correspond the recess in net district, the recess surface has miniature dull polish structure, be provided with the hot melt adhesive layer in the recess, the hot melt adhesive layer surface with the base plate surface flushes, hot melt adhesive layer surface coating film is connected with the aluminium rete, the solidification of high reflection coating film layer is connected on the aluminium rete.
Furthermore, the other side of the substrate is sequentially connected with a bonding glue layer, a fluorine film layer and a hardening coating.
A preparation method of a transparent grid backboard of a photovoltaic module comprises the following steps:
s1, pre-drawing frame lines of the grid area on the surface of the substrate, and sanding the inner part of the frame lines to form a coating groove, wherein the sanding depth is 0.5-1 mm;
s2, injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is smaller than the depth of the coating tank;
s3, partially shielding the non-grid area of the substrate and placing the substrate into a vacuum coating machine, and coating the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are in the same plane;
s4, coating a paint which takes water-soluble acrylic resin as a connecting material and contains high-reflection inorganic pigment and glass powder inside on the aluminum film layer to form a grid area with a white grid structure;
s5, solidifying the grid area of the white grid structure;
s6, the other surface of the substrate is sequentially connected with a bonding glue layer, a fluorine film layer and a hardening coating.
Further, the inorganic pigment in step S4 is one or more of silicon dioxide, titanium dioxide, zinc oxide, tin oxide, sodium carbonate, potassium nitrate, zirconium dioxide, boron oxide and aluminum oxide with a particle size range of 0.1-0.5 um;
the preparation method of the glass powder in the step S4 comprises the following steps: putting the glass powder with the particle size of 5-10 um in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder;
the mass ratio of the water-soluble acrylic resin, the inorganic pigment and the glass powder in the step 4 is 2-5: 6-8: 2 to 4.
Further, the water-soluble acrylic resin included in step S4 includes, in terms of weight fraction: 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine;
the preparation method comprises the steps of adding the components into a mixer, stirring uniformly at the speed of 200-2000 r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Further, the curing process in step S5 includes the specific steps of: and (4) treating the substrate treated in the step (S4) for 1-2min in a negative pressure environment, an ultraviolet high-pressure mercury lamp irradiation environment and an infrared heating environment, and finishing curing.
Further, the main peak wavelength of the ultraviolet high-pressure mercury lamp was 360 nm.
The invention has the beneficial effects that the outer surface of the designed white grid structure area has a regular sawtooth shape, and incident light can be directionally reflected to the cell sheets on two sides of the outer grid structure; the white grid area has higher reflectivity, and the non-white grid area has higher transmittance, so that the sunlight is fully utilized by the photovoltaic module, and the power generation power of the photovoltaic module is effectively improved; the transparent grid backboard can ensure that the photovoltaic module can be used reliably outdoors for a long time due to the arrangement of the fluorine film layer and the hardened coating.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of FIG. 1;
fig. 3 is a partial cross-sectional structural view of fig. 1.
In the figure, 1, a substrate, 2, a grid area, 3, a bonding adhesive layer, 4, a fluorine film layer, 5, a hard coating layer, 101, a hot melt adhesive layer, 102, an aluminum film layer and 201 are zigzag.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, and a transparent grid back sheet of a photovoltaic module includes:
a substrate 1;
the grid area 2 is arranged on the substrate 1 and is a high-reflection coating layer distributed in a positive two-dimensional array form;
the high-reflection coating layer is formed by taking water-soluble acrylic resin as a connecting material, containing high-reflection inorganic pigment and glass powder inside and curing on the substrate 1;
the outer surface of the high-reflection coating layer is arranged to be regular sawtooth-shaped 201.
The substrate 1 is made of a transparent material.
Referring to fig. 1 and 3, a groove corresponding to the grid area 2 is further formed in the substrate 1, a micro frosted structure is formed in the surface of the groove, a hot-melt adhesive layer 101 is arranged in the groove, the surface of the hot-melt adhesive layer 101 is flush with the surface of the substrate 1, an aluminum film layer 102 is connected to the outer surface of the hot-melt adhesive layer 101 in a coated mode, and the high-reflection coated film layer is connected to the aluminum film layer 102 in a cured mode.
As shown in fig. 1 and 2, the other surface of the substrate 1 is further connected with a bonding glue layer 3, a fluorine film layer 4 and a hard coating layer 5 in sequence.
A method for preparing a transparent grid back sheet of a photovoltaic module comprises the following steps:
s1, pre-drawing frame lines of the grid area on the surface of the substrate, and sanding the inner part of the frame lines to form a coating groove, wherein the sanding depth is 0.5-1 mm;
s2, injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is smaller than the depth of the coating tank;
s3, partially shielding the non-grid area of the substrate and placing the substrate into a vacuum coating machine, and coating the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are in the same plane;
s4, coating a paint which takes water-soluble acrylic resin as a connecting material and contains high-reflection inorganic pigment and glass powder inside on the aluminum film layer to form a grid area with a white grid structure;
s5, solidifying the grid area of the white grid structure;
s6, the other surface of the substrate is sequentially connected with a bonding glue layer, a fluorine film layer and a hardening coating.
The inorganic pigment in the step S4 is one or more of silicon dioxide, titanium dioxide, zinc oxide, tin oxide, sodium carbonate, potassium nitrate, zirconium dioxide, boron oxide and aluminum oxide with a particle size range of 0.1-0.5 um;
the preparation method of the glass powder in the step S4 comprises the following steps: putting the glass powder with the particle size of 5-10 um in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder;
the mass ratio of the water-soluble acrylic resin, the inorganic pigment and the glass powder in the step 4 is 2-5: 6-8: 2 to 4.
The water-soluble acrylic resin in step S4 includes, in terms of weight fraction: 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine;
the preparation method comprises the steps of adding the components into a mixer, stirring uniformly at the speed of 200-2000 r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
The curing process in step S5 includes: and (4) treating the substrate treated in the step (S4) for 1-2min in a negative pressure environment, an ultraviolet high-pressure mercury lamp irradiation environment and an infrared heating environment, and finishing curing.
The main peak wavelength of the ultraviolet high-pressure mercury lamp is 360 nm.
The first embodiment is as follows:
according to the weight percentage, firstly preparing water-soluble acrylic resin, adding 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine into a mixer, stirring uniformly at the speed of 200r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Preparing glass powder, namely putting the glass powder with the particle size of 5um into a vacuum coating machine in a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder to form the glass powder with excellent reflection effect.
The inorganic pigment is selected as titanium dioxide powder with the particle size range of 0.1 um.
The water-soluble acrylic resin, the inorganic pigment and the glass powder are mixed according to the mass ratio of 1:3:1 to form the coating.
Frame lines of a grid area are pre-drawn on the surface of the transparent PET polyester substrate, and the inner parts of the frame lines are sanded to form film coating grooves, wherein the sanding depth is 0.5 mm; injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is slightly smaller than the depth of the coating tank; partially shielding the non-grid area of the substrate and placing the non-grid area into a vacuum coating machine, and coating a film on the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are positioned on the same plane; coating the coating on the aluminum film layer to form a grid area of a white grid structure; curing the grid area with white grid structure, and treating for 1min under negative pressure, irradiation of ultraviolet high-pressure mercury lamp with main peak wavelength of 360nm, and infrared heating environment to complete curing. The other side of the substrate is sequentially connected with a laminating adhesive layer, a fluorine film layer and a hardening coating.
The second embodiment is as follows:
according to the weight percentage, firstly preparing water-soluble acrylic resin, adding 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine into a mixer, stirring uniformly at the speed of 600r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Preparing glass powder, namely putting the glass powder with the particle size of 8 mu m in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder to form the glass powder with excellent reflection effect.
The inorganic pigment is selected as titanium dioxide powder with the particle size range of 0.2 um.
The water-soluble acrylic resin, the inorganic pigment and the glass powder are mixed according to the mass ratio of 1:3:1 to form the coating.
Frame lines of a grid area are pre-drawn on the surface of the transparent PET polyester substrate, and the inner parts of the frame lines are sanded to form film coating grooves, wherein the sanding depth is 0.8 mm; injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is slightly smaller than the depth of the coating tank; partially shielding the non-grid area of the substrate and placing the non-grid area into a vacuum coating machine, and coating a film on the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are positioned on the same plane; coating the coating on the aluminum film layer to form a grid area of a white grid structure; and curing the grid area with the white grid structure, and treating for 1.5min in a negative pressure environment, under the irradiation of an ultraviolet high-pressure mercury lamp with a main peak wavelength of 360nm and in an infrared heating environment to finish curing.
The other side of the substrate is sequentially connected with a laminating adhesive layer, a fluorine film layer and a hardening coating.
The third concrete embodiment:
according to the weight percentage, firstly preparing water-soluble acrylic resin, adding 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine into a mixer, stirring uniformly at the speed of 1000r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Preparing glass powder, namely putting the glass powder with the particle size of 8 mu m in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder to form the glass powder with excellent reflection effect.
The inorganic pigment is selected as titanium dioxide powder with the particle size range of 0.4 um.
The water-soluble acrylic resin, the inorganic pigment and the glass powder are mixed according to the mass ratio of 1:3:1 to form the coating.
Frame lines of a grid area are pre-drawn on the surface of the transparent PET polyester substrate, and the inner parts of the frame lines are sanded to form film coating grooves, wherein the sanding depth is 0.75 mm; injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is slightly smaller than the depth of the coating tank; partially shielding the non-grid area of the substrate and placing the non-grid area into a vacuum coating machine, and coating a film on the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are positioned on the same plane; coating the coating on the aluminum film layer to form a grid area of a white grid structure; and curing the grid area with the white grid structure, and treating for 1.5min in a negative pressure environment, under the irradiation of an ultraviolet high-pressure mercury lamp with a main peak wavelength of 360nm and in an infrared heating environment to finish curing.
The other side of the substrate is sequentially connected with a laminating adhesive layer, a fluorine film layer and a hardening coating.
The fourth concrete embodiment:
according to the weight percentage, firstly preparing water-soluble acrylic resin, adding 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine into a mixer, stirring uniformly at the speed of 22000r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Preparing glass powder, namely putting the glass powder with the particle size of 10 mu m in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder to form the glass powder with excellent reflection effect.
The inorganic pigment is selected as titanium dioxide powder with the particle size range of 0.5 um.
The water-soluble acrylic resin, the inorganic pigment and the glass powder are mixed according to the mass ratio of 1:3:1 to form the coating.
Frame lines of a grid area are pre-drawn on the surface of the transparent PET polyester substrate, and the inner parts of the frame lines are sanded to form film coating grooves, wherein the sanding depth is 1 mm; injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is slightly smaller than the depth of the coating tank; partially shielding the non-grid area of the substrate and placing the non-grid area into a vacuum coating machine, and coating a film on the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are positioned on the same plane; coating the coating on the aluminum film layer to form a grid area of a white grid structure; curing the grid area with white grid structure, and treating for 2min in negative pressure environment, under irradiation of ultraviolet high-pressure mercury lamp with main peak wavelength of 360nm, and infrared heating environment to complete curing.
The other side of the substrate is sequentially connected with a laminating adhesive layer, a fluorine film layer and a hardening coating.
The fifth concrete embodiment:
according to the weight percentage, firstly preparing water-soluble acrylic resin, adding 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine into a mixer, stirring uniformly at the speed of 200r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
Preparing glass powder, namely putting the glass powder with the particle size of 5um into a vacuum coating machine in a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder to form the glass powder with excellent reflection effect.
The inorganic pigment is selected as titanium dioxide powder with the particle size range of 0.5 um.
The water-soluble acrylic resin, the inorganic pigment and the glass powder are mixed according to the mass ratio of 1:3:1 to form the coating.
Frame lines of a grid area are pre-drawn on the surface of the transparent PET polyester substrate, and the inner parts of the frame lines are sanded to form film coating grooves, wherein the sanding depth is 1 mm; injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is slightly smaller than the depth of the coating tank; partially shielding the non-grid area of the substrate and placing the non-grid area into a vacuum coating machine, and coating a film on the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are positioned on the same plane; coating the coating on the aluminum film layer to form a grid area of a white grid structure; curing the grid area with white grid structure, and treating for 1-2min under negative pressure, irradiation of ultraviolet high-pressure mercury lamp with main peak wavelength of 360nm, and infrared heating environment to complete curing.
The other side of the substrate is sequentially connected with a laminating adhesive layer, a fluorine film layer and a hardening coating.
The gridded photovoltaic back sheets obtained in examples 1-6 were evaluated, and the evaluation results are shown in the following
Table 1, specific evaluation methods and criteria are as follows:
reflectance ratio: the test method refers to CQC 3308 and 2013 backboard authentication technical Specification for photovoltaic module packaging.
Light transmittance: the test methods were according to ASTM D1003 transparent Plastic light transmittance and haze test method.
Weather resistance test: the test method refers to the standard GB/T2423.3 high and low temperature humid heat test method.
UV test: the test method refers to the standard GB/T31034 insulating back plate for crystalline silicon solar cell modules.
The invention has at least the following advantages:
1. the outer surface of the white grid structure area designed by the invention is in a regular sawtooth shape, and can directionally reflect incident light rays to the battery pieces on two sides of the outer grid structure;
2. the white grid area of the transparent grid backboard prepared by the invention has higher reflectivity, and the non-white grid area has higher transmittance, so that the sunlight is fully utilized by the photovoltaic module, and the power generation power of the photovoltaic module is effectively improved.
2. The transparent grid backboard prepared by the invention is provided with the fluorine film layer and the hardened coating, so that the photovoltaic module can be ensured to be used reliably outdoors for a long time.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A transparent grid back plate of a photovoltaic module is characterized by comprising:
a substrate (1);
the grid area (2) is arranged on the substrate (1) and is a high-reflection coating layer distributed in a positive two-dimensional array form;
the high-reflection coating layer is formed by taking water-soluble acrylic resin as a connecting material, containing high-reflection inorganic pigment and glass powder inside and curing on the substrate (1);
the outer surface of the high-reflection coating layer is arranged to be regular sawtooth-shaped (201).
2. The transparent grid backsheet for photovoltaic modules according to claim 1, characterized in that said substrate (1) is made of transparent material.
3. The transparent grid backboard of a photovoltaic module according to claim 1, wherein the substrate (1) is further provided with a groove corresponding to the grid area (2), the surface of the groove is provided with a micro frosted structure, a hot melt adhesive layer (101) is arranged in the groove, the surface of the hot melt adhesive layer (101) is flush with the surface of the substrate (1), the outer surface of the hot melt adhesive layer (101) is coated with an aluminum film layer (102), and the high-reflection coating layer is cured and connected on the aluminum film layer (102).
4. The transparent grid backboard of a photovoltaic module as claimed in claim 1, wherein the other surface of the substrate (1) is further connected with a bonding glue layer (3), a fluorine film layer (4) and a hard coating layer (5) in sequence.
5. The method for preparing the transparent grid back sheet of the photovoltaic module according to any one of claims 1 to 4, comprising the following steps:
s1, pre-drawing frame lines of the grid area on the surface of the substrate, and sanding the inner part of the frame lines to form a coating groove, wherein the sanding depth is 0.5-1 mm;
s2, injecting a hot melt adhesive layer into the coating tank, wherein the thickness of the hot melt adhesive layer is smaller than the depth of the coating tank;
s3, partially shielding the non-grid area of the substrate and placing the substrate into a vacuum coating machine, and coating the upper surface of the hot melt adhesive layer to form an aluminum film layer, so that the surface of the aluminum film layer and the surface of the substrate are in the same plane;
s4, coating a paint which takes water-soluble acrylic resin as a connecting material and contains high-reflection inorganic pigment and glass powder inside on the aluminum film layer to form a grid area with a white grid structure;
s5, solidifying the grid area of the white grid structure;
s6, the other surface of the substrate is sequentially connected with a bonding glue layer, a fluorine film layer and a hardening coating.
6. The method of claim 5, wherein the inorganic pigment in step S4 is one or more selected from silicon dioxide, titanium dioxide, zinc oxide, tin oxide, sodium carbonate, potassium nitrate, zirconium dioxide, boron oxide, and aluminum oxide with a particle size of 0.1-0.5 um;
the preparation method of the glass powder in the step S4 comprises the following steps: putting the glass powder with the particle size of 5-10 um in a vacuum coating machine under a vibration environment, and carrying out vacuum silver plating on the surface of the glass powder;
the mass ratio of the water-soluble acrylic resin, the inorganic pigment and the glass powder in the step 4 is 2-5: 6-8: 2 to 4.
7. The method for preparing a transparent grid back sheet for photovoltaic modules according to claim 5, wherein the water-soluble acrylic resin in the step S4 comprises the following components in parts by weight: 25 parts of methyl methacrylate, 25 parts of butadiene, 50 parts of neopentyl glycol diethoxy diacrylate, 0.5 part of tert-amyl peroxyacetate and 0.4 part of N-alkyl polyethylene polyamine;
the preparation method comprises the steps of adding the components into a mixer, stirring uniformly at the speed of 200-2000 r/min, and keeping the stirring speed unchanged to obtain the water-soluble acrylic resin.
8. The method for preparing the transparent grid back sheet of the photovoltaic module according to claim 5, wherein the curing treatment in the step S5 comprises the following specific steps: and (4) treating the substrate treated in the step (S4) for 1-2min in a negative pressure environment, an ultraviolet high-pressure mercury lamp irradiation environment and an infrared heating environment, and finishing curing.
9. The method for preparing a transparent grid back sheet for photovoltaic modules according to claim 8, wherein the ultraviolet high-pressure mercury lamp has a main peak wavelength of 360 nm.
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| CN114899276A (en) * | 2022-04-29 | 2022-08-12 | 杭州玻美文化艺术有限公司 | Production method for packaging photovoltaic module by using gridding liquid adhesive film and photovoltaic module |
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