CN102610679A - Solar cell back plane and preparation method thereof - Google Patents
Solar cell back plane and preparation method thereof Download PDFInfo
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- CN102610679A CN102610679A CN2012100775222A CN201210077522A CN102610679A CN 102610679 A CN102610679 A CN 102610679A CN 2012100775222 A CN2012100775222 A CN 2012100775222A CN 201210077522 A CN201210077522 A CN 201210077522A CN 102610679 A CN102610679 A CN 102610679A
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Abstract
The invention provides a solar cell back plane and a preparation method of the solar cell back plane, belonging to the technical field of the solar photovoltaic cells. According to the invention, weather resistance of the solar cell back plane can be further improved and service life of the solar cell back plane can be prolonged. The solar cell back plane provided by the invention comprises a weather resistance layer and a structure enhancement layer, the weather resistance layer is made of polyetherimide; the structure enhancement layer is provided with the weather resistance layer on two sides. The solar cell back plane is characterized of simple structure, normal materials, excellent performance, simple technology for preparation method and simple operation.
Description
Technical field
The present invention relates to the solar-energy photo-voltaic cell technical field, relate in particular to a kind of solar cell backboard and preparation method thereof.
Background technology
Solar energy replaces the optimal selection of traditional thermal power generation beyond doubt as a kind of environmental protection, the inexhaustible energy.Because solar cell needs long term exposure in outdoor application, so the battery sheet in the photovoltaic module must be protected, prevents Effect of Environmental and erosions such as steam in the atmosphere, oxygen, ultraviolet ray.The solar energy backboard is one of accessory of whole solar cell, mainly plays the mechanics support and protects the battery sheet to avoid the environmental factor infiltration, and the weatherability that therefore how to improve backboard all is the research emphasis of the sector all the time.
Solar cell backboard of the prior art mainly comprises following several kinds:
1. through PET polyester film and two-layer up and down weathering layer, be compounded to form sandwich structure, improve whole back plate weatherability and barrier.Its representative is the TPT backboard of Isovolta company in Europe, and wherein T is the Tedlar film that E.I.Du Pont Company's research and development are produced, this solar cell backboard be by the Tedlar film as weathering layer, one deck PET polyester film is composited in the middle of coating.
2. because the price of fluorine material is comparatively expensive, institute thinks the TPE solar energy backboard that saving cost, U.S. Madico company have been developed.Its structure is the same basically with TPT, also is sandwich structure, and different is to adopt ethylene-vinyl acetate copolymer (EVA) to replace the weather-proof fluorine material layer of internal layer among the TPT.
3. similarly also has KPK solar energy backboard with TPT.This backboard also is to adopt sandwich structure, through 3 layers of compound backboard performance that improves.Wherein K is the Kynar film that the research and development of French Arkema are produced, and promptly gathers inclined to one side fluorine divinyl (PVDF) film, and what the centre coated also is the PET polyester film.
Can find out from above 3 kinds of backboards no matter how the structure of backboard changes, what its structure enhancement layer was used all is the PET polyester.On performance; The hot strength of PET polyester can reach 152MPa, and bending modulus is about 10343MPa, and PET still is medium barrier macromolecular material; It is thus clear that mechanical stability that PET is outstanding and good barrier are the powerful guarantees that the solar energy backboard can use for a long time out of doors.Nonetheless, be 25 years the service life of using PET to make the backboard of structure enhancement layer in theory, and in the PCT senile experiment, find, in fact is difficult to reach this service life.So it is necessary seeking the stronger backboard basement membrane of a kind of weatherability.
PEI (PEI) is the very outstanding engineering plastics of a kind of combination property, and on mechanical property, the hot strength of PEI film can reach more than the 200MPa during room temperature, even if about 100 ℃ situation stretched intensity also can be stabilized in 100MP.On thermal property, the thermal property of PEI is extremely stable, and it is high temperature resistant to reach 400 ℃, low temperature resistant reaching-269 ℃.Aspect insulation, PEI is one of best macromolecular material of present insulating properties in the world, and its electrical strength can reach 130MV/m.The most important thing is that aspect weatherability weatherability is the advantage performance of PEI, especially aspect anti-hydrolysis; PEI soaks 10000 hours in boiling water after, its hot strength still can remain on more than 85%, under 132 ℃; After the steam hot press cycle 2000 times, its hot strength remains on 100%.In addition, aspect radioresistance, PEI has good uvioresistant, gamma ray performance, processing under the cobalt x radiation x of 400 Megarads, and its hot strength remains on 94%.This shows that the mechanical property of PEI, thermal property, electrical insulation properties and weather resistance are all better, be fit to do the weathering layer of solar cell backboard.
Summary of the invention
For the further service life of improving the weatherability of solar cell backboard (claiming the solar energy backboard again) and prolonging it, the present invention provides a kind of solar cell backboard and preparation method thereof.Simple in structure, the material of this solar energy backboard is easy to get, excellent performance, and preparation method's technology is simple, easy operating.
In order to achieve the above object, the present invention provides following technical proposals:
The present invention provides a kind of solar cell backboard, and its feature is, said solar cell backboard comprises weathering layer and structure enhancement layer, and the material of said weathering layer is PEI (PEI); Said structure enhancement layer both sides are provided with weathering layer.
Further, the weight average molecular weight of said PEI is 25000-28000, and inherent viscosity is 0.58-0.68dl/g, and density is 1.28-1.42g/cm
3
Further, the vitrification point of said PEI is 205-235 ℃, and fusing point is 305-335 ℃.
Further, the upper and lower surfaces coated of said structure enhancement layer is furnished with tack coat, and said weathering layer is combined with each other through tack coat and said structure enhancement layer.
Further, said PEI comprises equal benzene type PEI, biphenyl type PEI or its combination.
Further, said weathering layer is a simple tension PEI film.Its weight average molecular weight is 28000, and inherent viscosity is 0.58dl/g, and density is 1.28-1.42g/cm
3, vitrification point is 205-220 ℃, fusing point is 315-335 ℃.
Further, said structure enhancement layer is a polyester, is preferably PETG (PET).Preferred, said structure enhancement layer is a biaxially oriented polyester film, and the relative molecular weight of used PET section is 16000-18000, and density is 1.38-1.40g/cm
3, inherent viscosity is 0.52-0.65dl/g, vitrification point is 80 ℃-84 ℃.
Further, said bonding layer material comprises the combination of a kind of in dried binding agent of wink, anaerobism binding agent, pressure sensitive adhesives, hot-melt adhesive, thermosetting resin binding agent, emulsion and latex type binding agent and the high temperature resistant binder or at least two kinds.A kind of or wherein at least two kinds combination in the preferred polyvinyl acetate of said bonding layer material, polyurethane, polyacrylate or the epoxy resin, 25 ℃-133 ℃ of its heat curing temperature stuck-at-s.
Further, the thickness of said weathering layer is the 25-50 micron; The thickness of said structure enhancement layer is the 150-250 micron; The thickness of said tack coat is the 5-30 micron.
Further, the thickness of said weathering layer is the 25-30 micron; The thickness of said structure enhancement layer is the 150-200 micron; The thickness of said tack coat is the 5-20 micron.
Further, the thickness of said weathering layer is the 35-50 micron; The thickness of said structure enhancement layer is the 200-250 micron; The thickness of said tack coat is the 5-30 micron.
The present invention also provides a kind of preparation method of solar cell backboard, and said preparation method comprises the steps:
(1) on biaxial orientation stretching machine, produces biaxially oriented polyester film;
(2) be put into after the rolling of step (1) gained biaxially oriented polyester film and carry out off-line coating on the coating line, adhesive-coated after the upper and lower surface of polyester film, is carried out hot curing to binding agent and handled, make the degree of cross linking of binding agent reach 40%-60%;
(3) PEI film and step (2) products therefrom is compound, the PEI film is compound to polyester film through binding agent, forms solar cell backboard.
Above-mentioned biaxially oriented polyester film is the structure enhancement layer, and above-mentioned binding agent forms tack coat, and above-mentioned PEI film is a weathering layer.
Compared with prior art, the weathering layer material of solar cell backboard provided by the invention is PEI, not fluorine material.So the cost of solar cell backboard provided by the invention is lower, more help environmental protection; Its mechanical property, adhesion strength are also better than traditional back-panel, and back board structure is more stable, and be more outstanding to the support protective effect of whole solar cell sheet; On weatherability, solar cell backboard provided by the invention also obviously is superior to existing backboard, especially wet and heat ageing resistant property, thereby its useful life is also longer than existing backboard.Simultaneously, preparation method's technology of solar cell backboard provided by the invention is simple, easy operating.
Description of drawings
Fig. 1 is the generalized section of solar cell backboard provided by the invention;
Fig. 2 is the generalized section of solar cell backboard provided by the invention.
Wherein, 1 is weathering layer, and 2 is the structure enhancement layer, and 3 is tack coat.
Embodiment
As shown in Figure 1, solar cell backboard provided by the invention comprises weathering layer 1 and structure enhancement layer 2; Said structure enhancement layer 2 both sides are provided with weathering layer 1.
As shown in Figure 2, solar cell backboard provided by the invention comprises weathering layer 1 and structure enhancement layer 2; Said structure enhancement layer 2 both sides are provided with weathering layer 1, and the upper and lower surfaces coated of said structure enhancement layer 2 is furnished with tack coat 3, and said weathering layer 1 is combined with each other through tack coat 3 and said structure enhancement layer 2.
The used material and facility of the present invention is current material and equipment, for example:
All benzene type PEI sections, trade names are Kapton, buying is from du pont company;
The section of biphenyl type PEI, trade names are Upilex, buying is from company of Ube Industries Ltd.;
PETG (PET) has light section for the film level, and trade names are FG600, and buying is from Chinese Yizheng Fiber Optical plant Co., Ltd.
The preparation method of solar cell backboard provided by the invention comprises the steps:
(1) The tape casting is extruded in employing; On biaxial orientation stretching machine, produce biaxially oriented polyester film, each section of extruder temperature is respectively 180 ℃, 220 ℃, 275 ℃, 275 ℃, 275 ℃, 280 ℃, and cold bulging rotating speed is controlled at 30r/min; Cold bulging temperature is 60 ℃, and temperature range is 1 ℃; The longitudinal stretching temperature is controlled between 90 ℃-120 ℃, and draw ratio is controlled at 3.8-4.0, and the cross directional stretch temperature is 120 ℃-140 ℃, and draw ratio is controlled at 3.8-4.0, and the temperature error scope is 0.5 ℃.
(2) be put into after the rolling of step (1) gained biaxially oriented polyester film and carry out off-line coating on the coating line; With adhesive-coated after the upper and lower surface of polyester film; Hot curing 30min-40min under 125-135 ℃ condition, after the hot curing, the degree of cross linking of binding agent reaches 40%-60%.
(3) PEI film and step (2) products therefrom is compound, the PEI film is compound to polyester film through binding agent, forms solar cell backboard.
PEI film described in the above-mentioned steps (3) can be the product of buying on the market, also can be prepared from the PEI section through prior art.
Solar cell backboard provided by the invention adopts following method to test:
Hot strength and elongation at break: adopt the ASTMD-882 standard, testing equipment is the XLW film puller system that Labthink Instruments Co., Ltd. produces.
Wet and heat ageing resistant property: at 85 ℃, 85% environment facies are under the temperature and humidity conditions, and testing equipment adopts the HS4010 steady-state damp heat test case of Shen, Shanghai virtuous thermostatic equipment Co., Ltd production.
Percent thermal shrinkage: adopt the ASTMD-1204 standard, under 150 ℃, place 30min, testing equipment is a Binder FED convection oven.Error precision is 0.5 ℃.
Peel strength: adopt the ASTMD-1876 standard, used instrument is that the high article in Suzhou detect the GP-6017 peel test force appearance that Instr Ltd. produces.Peel strength is high more, and the cohesive force between layer and the layer is strong more.
Moisture-vapor transmission: adopt the ASTMF-1249 standard.The testing equipment buying is microtest machine Co., Ltd from Chengde.
Among the following embodiment 1-4, weathering layer is a simple tension PEI film, and the structure enhancement layer is the PET film, and bonding layer material is a polyvinyl acetate.
Embodiment 1:
Prepare the solar energy backboard as stated above, wherein the thickness of weathering layer is 25 μ m, and the thickness of structure enhancement layer is 150 μ m, and the thickness of tack coat is 5 μ m, and the correlated performance of gained backboard is seen table 1.
Embodiment 2:
Prepare the solar energy backboard as stated above, wherein the thickness of weathering layer is 30 μ m, and the thickness of structure enhancement layer is 200 μ m, and the thickness of tack coat is 10 μ m, and the correlated performance of gained backboard is seen table 1.
Embodiment 3:
Prepare the solar energy backboard as stated above, wherein the thickness of weathering layer is 30 μ m, and the thickness of structure enhancement layer is 250 μ m, and the thickness of tack coat is 15 μ m, and the correlated performance of gained backboard is seen table 1.
Embodiment 4:
Prepare the solar energy backboard as stated above, wherein the thickness of weathering layer is 30 μ m, and the thickness of structure enhancement layer is 250 μ m, and the thickness of tack coat is 20 μ m, and the correlated performance of gained backboard is seen table 1.
The solar cell backboard of control group is match 5 KPK of the prosperous vast and boundless Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 in Suzhou production and the HY-FTF BBF that Pinghu City China source photovoltaic material Co., Ltd produces.
The performance test data of the solar cell backboard of table 1 embodiment 1-4 preparation and the performance test data of control group solar cell backboard
Among the following embodiment 5-10, the structure enhancement layer is the PET film.
Embodiment 5:
Prepare the solar energy backboard as stated above, said binding agent is a polyvinyl acetate, with adhesive-coated after polyester film surface, hot curing 30min-40min under 125-130 ℃ condition; Said weathering layer is a simple tension PEI film, and the material of said PEI film comprises equal benzene type PEI and biphenyl type PEI (all the weight ratio of benzene type PEI and biphenyl type PEI is 1: 1);
Wherein the thickness of weathering layer is 50 μ m, and the thickness of structure enhancement layer is 250 μ m, and the thickness of tack coat is 30 μ m, and the correlated performance of gained backboard is seen table 2.
Embodiment 6:
Prepare the solar energy backboard as stated above; Said binding agent is the mixture (weight ratio of polyacrylate and epoxy resin is 1: 1) of polyacrylate and epoxy resin; With adhesive-coated after polyester film surface, hot curing 30min-40min under 130-135 ℃ condition; Said weathering layer is the equal benzene type of a simple tension PEI film;
Wherein the thickness of weathering layer is 25 μ m, and the thickness of structure enhancement layer is 200 μ m, and the thickness of tack coat is 20 μ m, and the correlated performance of gained backboard is seen table 2.
Embodiment 7:
Prepare the solar energy backboard as stated above, said binding agent is an epoxy resin, with adhesive-coated after polyester film surface, hot curing 30min under 130 ℃ condition; Said weathering layer is a simple tension biphenyl type PEI film;
Wherein the thickness of weathering layer is 35 μ m, and the thickness of structure enhancement layer is 250 μ m, and the thickness of tack coat is 30 μ m, and the correlated performance of gained backboard is seen table 2.
Embodiment 8:
Prepare the solar energy backboard as stated above, said binding agent is a polyurethane, with adhesive-coated after polyester film surface, hot curing 30min under 133 ℃ condition; Said weathering layer is a simple tension biphenyl type PEI film;
Wherein the thickness of weathering layer is 50 μ m, and the thickness of structure enhancement layer is 230 μ m, and the thickness of tack coat is 5 μ m, and the correlated performance of gained backboard is seen table 2.
Embodiment 9:
Prepare the solar energy backboard as stated above, said binding agent is an epoxy resin, with adhesive-coated after polyester film surface, hot curing 40min under 125 ℃ constant temperature; Said weathering layer is a simple tension PEI film, and the material of said PEI film comprises equal benzene type PEI and biphenyl type PEI (all the weight ratio of benzene type PEI and biphenyl type PEI is 1: 1);
Wherein the thickness of weathering layer is 40 μ m, and the thickness of structure enhancement layer is 180 μ m, and the thickness of tack coat is 15 μ m, and the correlated performance of gained backboard is seen table 2.
Embodiment 10:
Prepare the solar energy backboard as stated above, said binding agent is a polyacrylate, with adhesive-coated after polyester film surface, hot curing 35min under 130 ℃ constant temperature; Said weathering layer is the equal benzene type of a simple tension PEI film;
Wherein the thickness of weathering layer is 40 μ m, and the thickness of structure enhancement layer is 210 μ m, and the thickness of tack coat is 25 μ m, and the correlated performance of gained backboard is seen table 2.
The performance test data of the solar cell backboard of table 2 embodiment 5-10 preparation
Can draw through the data in table 1 and the table 2, solar cell backboard mechanical property provided by the invention and thermal property are good, and weatherability and adhesion strength are also better.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.Every equalization that content is done according to the present invention changes and modifies, and all is encompassed in the claim of the present invention.
Claims (10)
1. a solar cell backboard is characterized in that, said solar cell backboard comprises weathering layer and structure enhancement layer, and the material of said weathering layer is a PEI; Said structure enhancement layer both sides are provided with weathering layer.
2. a solar cell backboard as claimed in claim 1 is characterized in that, said PEI weight average molecular weight is 25000-28000, and inherent viscosity is 0.58-0.68dl/g, and density is 1.28-1.42g/cm
3
3. a solar cell backboard as claimed in claim 1 is characterized in that, the upper and lower surfaces coated of said structure enhancement layer is furnished with tack coat, and said weathering layer is combined with each other through tack coat and said structure enhancement layer.
4. a solar cell backboard as claimed in claim 3 is characterized in that, said PEI comprises equal benzene type PEI, biphenyl type PEI or its combination.
5. a solar cell backboard as claimed in claim 3 is characterized in that, said weathering layer is a simple tension PEI film.
6. a solar cell backboard as claimed in claim 3 is characterized in that, said structure enhancement layer is a polyester.
7. a solar cell backboard as claimed in claim 3 is characterized in that, the thickness of said weathering layer is the 25-50 micron; The thickness of said structure enhancement layer is the 150-250 micron; The thickness of said tack coat is the 5-30 micron.
8. a solar cell backboard as claimed in claim 3 is characterized in that, the thickness of said weathering layer is the 25-30 micron; The thickness of said structure enhancement layer is the 150-200 micron; The thickness of said tack coat is the 5-20 micron.
9. a solar cell backboard as claimed in claim 3 is characterized in that, the thickness of said weathering layer is the 35-50 micron; The thickness of said structure enhancement layer is the 200-250 micron; The thickness of said tack coat is the 5-30 micron.
10. the preparation method like one of claim 1-9 described solar cell backboard is characterized in that, said preparation method comprises the steps:
(1) on biaxial orientation stretching machine, produces biaxially oriented polyester film;
(2) be put into after the rolling of step (1) gained biaxially oriented polyester film and carry out off-line coating on the coating line, adhesive-coated after the upper and lower surface of polyester film, is carried out hot curing to binding agent and handled;
(3) PEI film and step (2) products therefrom is compound, the PEI film is compound to polyester film through binding agent, forms solar cell backboard.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102963090A (en) * | 2012-11-21 | 2013-03-13 | 江苏创景科技有限公司 | Insulation back plate for solar photovoltaic assembly and preparation method of back plate |
| CN107195717A (en) * | 2017-05-15 | 2017-09-22 | 江苏东昇光伏科技有限公司 | Solar cell backboard |
| CN107256902A (en) * | 2016-09-08 | 2017-10-17 | 合肥智慧殿投资管理有限公司 | A kind of solar cell backboard film and preparation method thereof |
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| CN107256902A (en) * | 2016-09-08 | 2017-10-17 | 合肥智慧殿投资管理有限公司 | A kind of solar cell backboard film and preparation method thereof |
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| CN107195717B (en) * | 2017-05-15 | 2018-12-18 | 句容协鑫集成科技有限公司 | Solar cell backboard |
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| CN102610679B (en) | 2014-07-23 |
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Effective date of registration: 20211027 Address after: 230000 room 1004, building 15, Xinzhan Industrial Park, logistics branch road, Xinzhan District, Hefei City, Anhui Province Patentee after: Hefei Changyang New Material Technology Co.,Ltd. Address before: No. 999, Qingfeng Road, Jiangbei District, Ningbo, Zhejiang 315000 Patentee before: NINGBO SOLARTRON TECHNOLOGY Co.,Ltd. |
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