CN102496642A - Back sheet of solar cell and preparation method for back sheet - Google Patents
Back sheet of solar cell and preparation method for back sheet Download PDFInfo
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- CN102496642A CN102496642A CN2011104355907A CN201110435590A CN102496642A CN 102496642 A CN102496642 A CN 102496642A CN 2011104355907 A CN2011104355907 A CN 2011104355907A CN 201110435590 A CN201110435590 A CN 201110435590A CN 102496642 A CN102496642 A CN 102496642A
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Abstract
The invention provides a back sheet of a solar cell. The back sheet comprises a substrate with a high aqueous vapor barrier property, a bonder layer and a weatherproof layer, wherein the bonder layer is formed by a first resin composition comprising 70 to 90 mass parts of hydroxyl-containing or carboxyl-containing matrix resin, 10 to 30 mass parts of fluorine-containing resin, 5 to 15 mass parts of curing agent and 5 to 30 mass parts of solvent; the weatherproof layer is formed by a second resin composition comprising 100 mass parts of fluorine-containing resin, 5 to 15 mass parts of curing agent, 50 to 150 mass parts of inorganic filler and 50 to 100 mass parts of solvent; the fluorine-containing resin in the first resin composition is the same as that in the second resin composition; and the curing agent in the first resin composition is the same as that in the second resin composition. The invention also provides a preparation method for the back sheet of the solar cell. The back sheet of the solar cell has a high bond property and low aqueous vapor permeability.
Description
Technical field
The invention belongs to technical field of solar batteries, relate in particular to a kind of solar cell backboard and preparation method thereof.
Background technology
Solar cell is photovoltaic cell again, is the device that directly changes into luminous energy electric energy through photoelectric effect or Photochemical effects, is widely used in departments such as military affairs, space flight, industry, commerce, agricultural, communication, household electrical appliance and public utility.
Difference according to material therefor; Solar cell can be divided into silicon solar cell, multi-element compounds thin-film solar cells, polymer multi-layer modified electrode type solar cell, nano-crystalline solar battery, organic solar batteries etc.; Wherein, Silicon solar cell is to develop the most ripe battery at present, in application, occupies leading position.Silicon solar cell can be divided into monocrystaline silicon solar cell, multi-crystal silicon film solar battery and amorphous silicon thin-film solar cell again.
Silicon solar cell is a laminated construction normally; Mainly comprise surface layer of glass, solar battery sheet, ethylene-vinyl acetate sealant and solar energy backboard; Wherein, The solar energy backboard is called solar cell backboard, solar cell backboard film, photovoltaic back, photovoltaic back film etc. again, and it is positioned at the back side of solar panel or solar battery sheet, and cell panel or battery sheet are played protection and supporting role.Because solar cell is used for the open air more, and is generally useful life 25 years, therefore, the solar energy backboard need have good weatherability and moisture barrier property.
In the prior art, solar cell backboard generally adopts fluorine material preparation, and like TPT type backboard, wherein, T refers to Tedlar, i.e. polyvinyl fluoride fluorine (PVF) plastic film of E.I.Du Pont Company, and P refers to biaxial tension PET thin plate; In order to save cost, can adopt other plastic films to replace one deck fluorine plastic film in the TPT type backboard, like TPE type backboard, wherein, E generally is meant LLDPE, EVA or other ethylene copolymer etc.The backboard of these two kinds of structures generally adopts composite algorithm production; Be about to layers of material and make film forming, obtain having the backboard of said structure again through composite algorithm, still; When adopting fluorine-containing compound to adopt composite algorithm to produce, there are shortcomings such as processing difficulties, complex manufacturing.In order to overcome the shortcoming of composite algorithm, prior art also can adopt cladding process to produce backboard, and cladding process need not that fluorine material is carried out film forming and handles; But; When adopting at present general primary coating technology film forming, the film surface that obtains can produce macroscopic pin hole, thereby influences the water vapor barrier property of backboard; PET occurs and be prone to phenomenons such as hydrolysis, adhesive jaundice take place, influence the useful life of solar cell backboard.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of solar cell backboard and preparation method thereof, and solar cell backboard provided by the invention has good water vapor barrier property, caking property and weatherability, has long useful life.
The invention provides a kind of solar cell backboard, comprise substrate, be compounded in the adhesive layer on the said substrate and be compounded in the weathering layer on the said adhesive layer, said adhesive layer is formed by first resin combination:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
Said weathering layer is formed by second resin combination:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
Preferably, said fluorine resin is one or more in Kynoar, trifluoro-ethylene-hydroxy alkyl vinyl ether co-polymer, CTFE-hydroxy alkyl vinyl ether co-polymer, tetrafluoroethene-hydroxy alkyl vinyl ether co-polymer, trifluoro-ethylene-carboxyalkyl vinyl ester copolymer, CTFE-carboxyalkyl vinyl ester copolymer and the tetrafluoroethene-carboxyalkyl vinyl ester copolymer.
Preferably, in said first resin combination, the said matrix resin that contains hydroxyl or carboxyl is to contain the mylar of hydroxyl or carboxyl or contain hydroxyl or the polyacrylate resin of carboxyl.
Preferably, said curing agent is one or more in epoxy curing agent, isocyanate curing agent and the carbodiimides curing agent.
Preferably, the solvent in said first resin combination is one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone, and the solvent in said second resin combination is one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone.
Preferably, the solvent in said first resin combination is identical with solvent in second resin combination.
Preferably, said inorganic filler is oxide, titanyl compound, the oxide of aluminium or the oxide of tin of silicon.
Preferably, also comprise the barrier layer that is compounded between said adhesive layer and the weathering layer, said barrier layer is formed by aluminium or silicon dioxide.
Compared with prior art, solar cell backboard provided by the invention has the structure of substrate/adhesive layer/weathering layer, and wherein, said adhesive layer is formed by first resin combination: the matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts; The fluorine resin of 10～30 mass parts; The curing agent of 5～15 mass parts; The solvent of 5～30 mass parts; Said weathering layer is formed by second resin combination: the fluorine resin of 100 mass parts; The curing agent of 5～15 mass parts; The inorganic filler of 50～150 mass parts; The solvent of 50～100 mass parts; Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.The present invention uses same fluorine resin and curing agent in adhesive layer and weathering layer, strengthened the adhesive property between adhesive layer and the weathering layer; The present invention forms weathering layer with fluorine resin, makes the solar cell backboard that obtains have good water vapor barrier property and weatherability, thereby prolongs the useful life of solar cell backboard.
The present invention also provides a kind of preparation method of solar cell backboard, may further comprise the steps:
A) on substrate, apply first resin combination and curing, make the curing degree of said first resin combination reach 30%～70%, said first resin combination comprises:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
B) on the first resin combination solidfied material that said step a) obtains, apply second resin combination, obtain solar cell backboard after the curing, said second resin combination comprises:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
Preferably, said step b) specifically comprises:
B1) on the first resin combination solidfied material that said step a) obtains, apply first mass parts, second resin combination and curing, make first mass parts, the second resin combination curing degree reach 30%～60%;
B2) to said step b1) apply second mass parts, second resin combination on the first mass parts resin combination solidfied material that obtains and solidify, obtain solar cell backboard.
Preferably, the mass ratio of said first mass parts, second resin combination and said second mass parts, second resin combination is (60～80): (20～40).
The present invention at first applies first resin combination and solidifies on substrate; Reach at 30%～70% o'clock at its curing degree and continue to apply second resin combination; And second resin combination and first resin combination are solidified simultaneously form weathering layer and adhesive layer respectively; Because first resin combination has used identical fluorine resin and curing agent with second resin combination; And when first resin combination is in semi-cured state, apply second resin combination and make adhesive layer and weathering layer film-forming together, strengthened the adhesive property between adhesive layer and the weathering layer.Experimental result shows that solar cell backboard provided by the invention has good adhesive property and lower steam transmitance, and after process UV processing, thermal cycle processing, moisture-proof froze processing and moisture-proof heat treatment, the adhesive force of adhesive layer and weathering layer was 0 grade.Further; The present invention at first applies first mass parts, second resin combination and solidifies on the adhesive layer of semi-solid preparation attitude; Reach at 30%～60% o'clock at its curing degree and continue to apply second mass parts, second resin combination; This twice coating processes can reduce the appearance of weathering layer pin hole, thereby improves the weather resistance and the barrier of weathering layer, thereby prolongs the useful life of solar cell backboard.
Description of drawings
The structural representation of the solar cell backboard that Fig. 1 provides for the embodiment of the invention.
Embodiment
The invention provides a kind of solar cell backboard, comprise substrate, be compounded in the adhesive layer on the said substrate and be compounded in the weathering layer on the said adhesive layer, wherein, said adhesive layer is formed by first resin combination:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
Said weathering layer is formed by second resin combination:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
The present invention uses same fluorine resin and curing agent in adhesive layer and weathering layer, strengthened the adhesive property between adhesive layer and the weathering layer; The present invention forms weathering layer with fluorine resin, makes the solar cell backboard that obtains have good water vapor barrier property and weatherability, thereby prolongs the useful life of solar cell backboard.
Solar cell backboard provided by the invention has the universal architecture of present solar cell backboard, comprises substrate, is compounded in the adhesive layer on the said substrate and is compounded in the weathering layer on the said adhesive layer.In the present invention, it is the symmetrical structure of symmetry axis that said solar cell backboard can have with the substrate, also can have dissymmetrical structure.Referring to Fig. 1, the structural representation of the solar cell backboard that Fig. 1 provides for the embodiment of the invention, wherein; 1 is substrate; 2 for being compounded in first adhesive layer on the substrate 1, and 3 for being compounded in first weathering layer on first adhesive layer 2, and 4 for being compounded in the barrier layer between first adhesive layer 2 and first weathering layer 3; 5 for being compounded in second adhesive layer of substrate 1 another side, and 6 for being compounded in second weathering layer on second adhesive layer 5.
Said solar cell backboard has when being the symmetrical structure of symmetry axis with the substrate; It is specially: substrate; Be compounded in first adhesive layer and second adhesive layer on the said substrate respectively; Be compounded in first weathering layer on said first adhesive layer, be compounded in second weathering layer on said second adhesive layer, promptly it has the structure of first weathering layer/first adhesive layer/substrate/second adhesive layer/second weathering layer; Wherein, first adhesive layer is identical with second adhesive layer, and first weathering layer is identical with second weathering layer.
When said solar cell backboard had dissymmetrical structure, it was specially: substrate, and be compounded in the adhesive layer on the said substrate and be compounded in the weathering layer on the said adhesive layer, promptly have the structure of weathering layer/adhesive layer/substrate.
The present invention does not have particular restriction to the structure of said solar cell backboard, can be dissymmetrical structure for being the symmetrical structure of symmetry axis with the substrate yet.Compare with dissymmetrical structure; The symmetrical structure that with the substrate is symmetry axis has only increased same adhesive layer and weathering layer at the substrate another side; Therefore; The present invention is that example specifies with the solar cell with dissymmetrical structure, one skilled in the art may determine that it is the solar cell backboard of the symmetrical structure of symmetry axis that following description is equally applicable to have with the substrate.
In said solar cell backboard, said substrate is preferably PETG (PET) film of those skilled in the art's resin, and the present invention does not have particular restriction to its thickness, and those skilled in the art can confirm according to actual needs.
In said solar cell backboard, said weathering layer is formed by second resin combination, and said second resin combination comprises:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Fluorine resin has good weather resistance, can be used as the weathering layer of solar cell backboard.In the present invention; Said fluorine resin is preferably one or more in Kynoar, trifluoro-ethylene-hydroxy alkyl vinyl ether co-polymer, CTFE-hydroxy alkyl vinyl ether co-polymer, tetrafluoroethene-hydroxy alkyl vinyl ether co-polymer, trifluoro-ethylene-carboxyalkyl vinyl ester copolymer, CTFE-carboxyalkyl vinyl ester copolymer and the tetrafluoroethene-carboxyalkyl vinyl ester copolymer, as the manufacturing of Da Jin coating, model is the fluorine resin of GK570; Asahi Glass Co., Ltd makes, model is that the fluorine resin of LF200, LF600X etc. all can.
Also comprise curing agent in said second resin combination, the effect of said curing agent is to make the resin combination film-forming.In the present invention, said curing agent is preferably one or more in epoxy curing agent, isocyanate curing agent and the carbodiimides curing agent, and curing agent such as the TKA-100 that makes like Asahi Chemical Industry, the N3390 of Bayer, N100 all can.In the present invention, the content of said curing agent is 5～15 mass parts, is preferably 8～12 mass parts.
Said second resin combination also comprises inorganic filler, and the effect of said inorganic filler is to strengthen the resistance to wear of said weathering layer.Said inorganic filler is preferably oxide, titanyl compound, the oxide of aluminium or the oxide of tin etc. of silicon, more preferably silicon dioxide.The content of said inorganic filler is 50～150 mass parts, is preferably 70～120 mass parts, more preferably 80～100 mass parts.
Said second resin combination also comprises solvent, and said solvent is preferably one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone, more preferably the mixture of cyclohexanone and toluene.In the present invention, the content of said solvent is 50～100 mass parts, is preferably 70～90 mass parts.
Said second resin combination can form film after solidifying, thereby obtains weathering layer.
In said solar cell backboard, said adhesive layer is formed by first resin combination, and first resin combination comprises:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts.
In said first resin combination, the said matrix resin that contains hydroxyl or carboxyl is the matrix resin of binding agent, mainly plays cementation.In the present invention, the said resin that contains hydroxyl or carboxyl is preferably the mylar that contains hydroxyl or carboxyl or contains hydroxyl or the polyacrylate resin of carboxyl, spins GK680, ST5790, Japanese synthetic chemistry 8723 etc. like Japanese Japan.In said first resin combination, the said mass fraction that contains the matrix resin of hydroxyl or carboxyl is 70～90 mass parts, is preferably 75～85 mass parts.
Said first resin combination also contains fluorine resin; Said fluorine resin is identical with fluorine resin in said second resin combination; Be that said adhesive layer uses identical fluorine resin with said weathering layer, thereby strengthen the adhesive property between adhesive layer and the weathering layer.In said first resin combination, the content of said fluorine resin is 10～30 mass parts, is preferably 15～25 mass parts.
Said first resin combination also contains curing agent, and said curing agent is identical with curing agent in said second resin combination, and promptly said adhesive layer and said weathering layer use identical curing agent, makes adhesive layer and weathering layer concurrently curable film forming.In said first resin combination, the content of said curing agent is 5～15 mass parts, is preferably 8～13 mass parts.
Said first resin combination also comprises solvent, and said solvent is preferably one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone, more preferably the mixture of cyclohexanone and toluene.In this said first resin combination, the content of said solvent is 5～30 mass parts, is preferably 10～25 mass parts.In the present invention, the solvent in said first resin combination can be identical with solvent in second resin combination, also can be different, and those skilled in the art can select and confirm according to the matrix resin of selecting for use in first resin combination.
Said first resin combination can obtain adhesive layer behind film-forming on the substrate, said second resin combination can obtain weathering layer behind film-forming on the said adhesive layer.
In the present invention, the thickness of said adhesive layer is preferably 1 μ m～10 μ m, more preferably 2 μ m～8 μ m.
For water vapor barrier property and the resistance to elevated temperatures that improves said solar cell backboard, between said adhesive layer and said weathering layer, also comprise barrier layer.Said barrier layer is formed by aluminium or silicon dioxide etc.
The present invention does not have particular restriction to the thickness of each layer in the said solar cell backboard, and those skilled in the art can confirm and select as required.
The present invention can adopt the method for coating to prepare said solar energy backboard, also can adopt composite methods to prepare said solar cell backboard, and in order to reduce the preparation difficulty, the present invention preferably adopts the method preparation of coating.
The present invention also provides a kind of preparation method of solar cell backboard, may further comprise the steps:
A) on substrate, apply first resin combination and curing, make the curing degree of said first resin combination reach 30%～70%, said first resin combination comprises:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
B) on the first resin combination solidfied material that said step a) obtains, apply second resin combination, obtain solar cell backboard after the curing, said second resin combination comprises:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
In preparation method provided by the invention; Said first resin combination forms adhesive layer; Said second resin combination forms weathering layer; Said first resin combination is identical with second resin combination with described first resin combination of second resin combination and technique scheme, and the present invention is not giving unnecessary details, and gets final product referring to technique scheme.
The present invention at first applies first resin combination at substrate surface; The present invention does not have particular restriction to said painting method, and scraper well known to those skilled in the art is filmed, dip-coating, extruding are coated with, slide coating, curtain is coated with, modes such as rod is coated with, air knife coating, roller coat, spraying all can.
After applying first resin combination on the substrate, said first resin combination is cured.In order to increase the cementability between adhesive layer and the weathering layer; The present invention reaches 30%～70% at the curing degree of said first resin combination, preferably reach 40%～60%, more preferably reach at 45%～55% o'clock stops to solidify; At this moment, first resin combination is a semi-cured state.In the present invention, the temperature of said curing is preferably 120 ℃～140 ℃, and more preferably 125 ℃～135 ℃, the time of said curing is preferably 1min～2min.
After making first resin combination reach semi-cured state; On the first resin combination solidfied material that obtains, apply second resin combination, said coating can be filmed for scraper, dip-coating, extruding are coated with, slide coating, curtain is coated with, rod is coated with, air knife coating, roller coat, spraying etc.Second resin combination is cured after applying and finishing, and in the solidification process, first resin combination forms adhesive layer by the semi-cured state full solidification, and the second resin combination full solidification forms weathering layer.Because adhesive layer and weathering layer be film-forming simultaneously, its caking property is better.
In order to reduce the pin hole on the weathering layer, improve the barrier property of weathering layer, the present invention preferably makes the weathering layer film-forming according to following method:
B1) on the first resin combination solidfied material that said step a) obtains, apply first mass parts, second resin combination and curing, make first mass parts, the second resin combination curing degree reach 30%～60%;
B2) to said step b1) apply second mass parts, second resin combination on the first mass parts resin combination solidfied material that obtains and solidify, obtain solar cell backboard.
The present invention applies second resin combination respectively at twice, reduces the pin hole of the weathering layer that obtains, and improves the weather resistance and the barrier property of weathering layer.
The present invention at first is coated in second resin combination of first mass parts on the semi-solid preparation thing of first resin combination formation; Solidifying makes first mass parts, the second resin combination curing degree preferably reach 30%～60%; More preferably 35%～55%; At this moment, first mass parts, second resin combination is in semi-cured state.The temperature of said curing is preferably 140 ℃～160 ℃, and more preferably 145 ℃～155 ℃, the time of said curing is preferably 1min～2min.
Continuation is coated in second resin combination of second mass parts on the semi-solid preparation thing of first mass parts, second resin combination formation, and completion of cure forms adhesive layer and weathering layer simultaneously.The temperature of said curing is preferably 140 ℃～160 ℃, and more preferably 145 ℃～155 ℃, the time of said curing is preferably 1min～2min.
In the present invention, the mass ratio of said first mass parts, second resin combination and said second mass parts, second resin combination is preferably (60～80): (20～40), more preferably (65～75): (25～35).
Behind the completion of cure, can obtain solar cell backboard.
In the present invention, applying before first resin combination forms adhesive layer, preferably compound barrier layer on said substrate.The present invention is vapor deposition barrier layer on said substrate preferably, on said barrier layer, applies first resin combination again.
After obtaining solar cell backboard, according to following method it is carried out performance test respectively:
1, paint adhesion test
With reference to the cross-hatching adhesive force test (being divided into 1mm * 1mm grid) of stipulating among the ASTM D3359-87, detect fluorine coating and whether break away from film in base material PET.
Evaluation criterion:
0 grade: do not have disengaging;
1 grade: break away from 5% area;
2 grades: break away from 5%～15% area;
2, anti-UV test
Test condition: with reference to IEC6121515---10.10;
UV?A：320～385nm；
UV?B：280～320nm；
Wavelength is the ultraviolet light of 280nm to 385nm, and intensity is no more than 250W/m
2, inhomogeneous less than ± 15%.
UV A+B is radiated 15KWh/m, wherein UV B>=5KWh/m
2, T:60 ± 5 ℃;
Handle back test paint adhesion.
3, thermal cycle test
Test condition: with reference to IEC61215---10.11;-40 ℃ (± 2 ℃)～85 ℃ (± 2 ℃); 200Cycles; The speed of variations in temperature is no more than 100 ℃/h between the highest and minimum temperature, under each extreme temperature, should keep stable 10min at least, is no more than 6h a circulation timei.Handle back test paint adhesion.
4, moisture-proof freezes test
Test condition: with reference to IEC6121515---10.12;-40 ℃ (± 2 ℃)～85 ℃ (± 2 ℃) circulate 10 times.Handle back test paint adhesion.
5, moisture-proof heat test
Test condition: with reference to IEC6121515---10.13; 85 ℃ of (± 2 ℃)/85%RH, 1000h.Handle back test paint adhesion.
Experimental result shows that solar cell backboard provided by the invention has good adhesive property and lower steam transmitance, and after process UV processing, thermal cycle processing, moisture-proof froze processing and moisture-proof heat treatment, the adhesive force of adhesive layer and weathering layer was 0 grade.
The present invention at first applies first resin combination and solidifies on substrate; Reach at 30%～70% o'clock at its curing degree and continue to apply second resin combination; And second resin combination and first resin combination are solidified simultaneously form weathering layer and adhesive layer respectively; Because first resin combination has used identical fluorine resin and curing agent with second resin combination; And when first resin combination is in semi-cured state, apply second resin combination and make adhesive layer and weathering layer film-forming together, strengthened the adhesive property between adhesive layer and the weathering layer.Further; The present invention at first applies first mass parts, second resin combination and solidifies on the adhesive layer of semi-solid preparation attitude; Reach at 30%～60% o'clock at its curing degree and continue to apply second mass parts, second resin combination; This twice coating processes can reduce the appearance of weathering layer pin hole, thereby improves the weather resistance and the barrier of weathering layer, thereby prolongs the useful life of solar cell backboard.
In order to further specify the present invention, solar cell backboard provided by the invention and preparation method thereof is described in detail below in conjunction with embodiment.
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
The method that adopts vacuum evaporation forms barrier layer at the surperficial vapor deposition aluminium foil of PET film; First resin combination that mixes is coated in aluminium foil barrier layer surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 1～2min, obtain first adhesive layer of semi-cured state; Second resin combination that mixes, account for total amount 70wt% is coated on first adhesive layer of semi-solid preparation; 150 ℃ of oven dry 1～2min; First resin combination and second resin combination are solidified together; At this moment, the basic completion of cure of first resin combination forms first adhesive layer, and second resin combination is semi-cured state; Subsequently, second resin combination of residue 30wt% is coated on second resin combination of semi-cured state and at 150 ℃ of baking 1～2min down, obtaining total build is first weathering layer of 23 μ m～30 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
Comparative example 1
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
First resin combination that mixes is coated in PET film surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 3～5min, form first adhesive layer after the full solidification; Second resin combination that mixes is coated on said first adhesive layer, 150 ℃ of oven dry 3min, obtaining total build after the full solidification is first weathering layer of 20 μ m～25 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
The method that adopts vacuum evaporation forms barrier layer at the surperficial steam coating silicon dioxide film of PET film; First resin combination that mixes is coated in silicon dioxide barrier layer surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 1～2min, obtain first adhesive layer of semi-cured state; Second resin combination that mixes, account for total amount 80wt% is coated on first adhesive layer of semi-solid preparation; 150 ℃ of oven dry 1～2min; First resin combination and second resin combination are solidified together; At this moment, the basic completion of cure of first resin combination forms first adhesive layer, and second resin combination is semi-cured state; Subsequently, second resin combination of residue 20wt% is coated on second resin combination of semi-cured state and at 150 ℃ of baking 1～2min down, obtaining total build is first weathering layer of 23 μ m～30 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
Comparative example 2
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
First resin combination that mixes is coated in PET film surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 3～5min, form first adhesive layer after the full solidification; Second resin combination that mixes is coated on said first adhesive layer, 150 ℃ of oven dry 3min, obtaining total build after the full solidification is first weathering layer of 20 μ m～25 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
The method that adopts vacuum evaporation forms barrier layer at the surperficial steam coating silicon dioxide film of PET film; First resin combination that mixes is coated in silicon dioxide barrier layer surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 1～2min, obtain first adhesive layer of semi-cured state; Second resin combination that mixes, account for total amount 60wt% is coated on first adhesive layer of semi-solid preparation; 150 ℃ of oven dry 1～2min; First resin combination and second resin combination are solidified together; At this moment, the basic completion of cure of first resin combination forms first adhesive layer, and second resin combination is semi-cured state; Subsequently, second resin combination of residue 40wt% is coated on second resin combination of semi-cured state and at 150 ℃ of baking 1～2min down, obtaining total build is first weathering layer of 23 μ m～30 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
Comparative example 3
In the present embodiment, first resin composition formula is following, in mass fraction:
Second resin composition formula is following, in mass fraction:
First resin combination that mixes is coated in PET film surface with the scraper coating device of 30 μ m, under 130 ℃ temperature, toasts 3～5min, form first adhesive layer after the full solidification; Second resin combination that mixes is coated on said first adhesive layer, 150 ℃ of oven dry 3min, obtaining total build after the full solidification is first weathering layer of 20 μ m～25 μ m;
Form second adhesive layer and second weathering layer respectively on another surface of PET film according to the method described above, obtain having second weathering layer/second adhesive layer/solar cell backboard of PET film/barrier layer/first adhesive layer/first weathering layer structure.
According to method mentioned above said solar cell backboard is carried out performance test, the result is referring to table 1, the performance parameter of the solar cell backboard that table 1 provides for the embodiment of the invention and comparative example.
The performance parameter of the solar cell backboard that table 1 embodiment of the invention and comparative example provide
Can know by table 1; Solar cell backboard provided by the invention has good adhesive property and lower steam transmitance; After process UV processing, thermal cycle processing, moisture-proof froze processing and moisture-proof heat treatment, the adhesive force of adhesive layer and weathering layer was 0 grade, and its steam transmitance is less than 1g.m
2/ 24h.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. a solar cell backboard comprises substrate, is compounded in the adhesive layer on the said substrate and is compounded in the weathering layer on the said adhesive layer, it is characterized in that said adhesive layer is formed by first resin combination:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
Said weathering layer is formed by second resin combination:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
2. solar cell backboard according to claim 1; It is characterized in that said fluorine resin is one or more in Kynoar, trifluoro-ethylene-hydroxy alkyl vinyl ether co-polymer, CTFE-hydroxy alkyl vinyl ether co-polymer, tetrafluoroethene-hydroxy alkyl vinyl ether co-polymer, trifluoro-ethylene-carboxyalkyl vinyl ester copolymer, CTFE-carboxyalkyl vinyl ester copolymer and the tetrafluoroethene-carboxyalkyl vinyl ester copolymer.
3. solar cell backboard according to claim 1 is characterized in that, in said first resin combination, the said matrix resin that contains hydroxyl or carboxyl is to contain the mylar of hydroxyl or carboxyl or contain hydroxyl or the polyacrylate resin of carboxyl.
4. solar cell backboard according to claim 1 is characterized in that, said curing agent is one or more in epoxy curing agent, isocyanate curing agent and the carbodiimides curing agent.
5. solar cell backboard according to claim 1; It is characterized in that; Solvent in said first resin combination is one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone, and the solvent in said second resin combination is one or more in toluene, ethyl acetate, butyl acetate and the cyclohexanone.
6. solar cell backboard according to claim 1 is characterized in that, said inorganic filler is oxide, titanyl compound, the oxide of aluminium or the oxide of tin of silicon.
7. solar cell backboard according to claim 1 is characterized in that, also comprises the barrier layer that is compounded between said adhesive layer and the weathering layer, and said barrier layer is formed by aluminium or silicon dioxide.
8. the preparation method of a solar cell backboard may further comprise the steps:
A) on substrate, apply first resin combination and curing, make the curing degree of said first resin combination reach 30%～70%, said first resin combination comprises:
The matrix resin that contains hydroxyl or carboxyl of 70～90 mass parts;
The fluorine resin of 10～30 mass parts;
The curing agent of 5～15 mass parts;
The solvent of 5～30 mass parts;
B) on the first resin combination solidfied material that said step a) obtains, apply second resin combination, obtain solar cell backboard after the curing, said second resin combination comprises:
The fluorine resin of 100 mass parts;
The curing agent of 5～15 mass parts;
The inorganic filler of 50～150 mass parts;
The solvent of 50～100 mass parts;
Wherein, the fluorine resin in first resin combination is identical with fluorine resin in second resin combination, and the curing agent in first resin combination is identical with curing agent in second resin combination.
9. preparation method according to claim 8 is characterized in that, said step b) specifically comprises:
B1) on the first resin combination solidfied material that said step a) obtains, apply first mass parts, second resin combination and curing, make first mass parts, the second resin combination curing degree reach 30%～60%;
B2) to said step b1) apply second mass parts, second resin combination on the first mass parts resin combination solidfied material that obtains and solidify, obtain solar cell backboard.
10. preparation method according to claim 9 is characterized in that, the mass ratio of said first mass parts, second resin combination and said second mass parts, second resin combination is (60～80): (20～40).
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| CN102931263A (en) * | 2012-11-12 | 2013-02-13 | 乐凯胶片股份有限公司 | Solar battery back film and preparation method thereof |
| CN103072349A (en) * | 2013-01-30 | 2013-05-01 | 西安航天三沃化学有限公司 | Composite film for back plate of solar battery |
| CN103606581A (en) * | 2013-11-25 | 2014-02-26 | 云南云天化股份有限公司 | Solar cell backboard, manufacturing method thereof and solar cell |
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| CN108848670B (en) * | 2016-05-20 | 2021-11-19 | 三井化学株式会社 | Curable composition and use thereof |
| US11421135B2 (en) | 2016-05-20 | 2022-08-23 | Mitsui Chemicals, Inc. | Curable composition, coating material, solar cell coating material, solar cell back sheet coating material, adhesive, solar cell adhesive, solar cell back sheet adhesive, producing method of sheet, and curing agent |
| CN109244164A (en) * | 2017-05-19 | 2019-01-18 | 浙江帝恒实业有限公司 | A kind of preparation method of UV resistance aging solar cell backboard film |
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| CN107841204A (en) * | 2017-11-03 | 2018-03-27 | 通威太阳能（安徽）有限公司 | A kind of Weather-resistant high reflection rate solar cell backboard film and preparation method thereof |
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Effective date of registration: 20161021 Address after: 401220 Changshou District of Chongqing economic and Technological Development Zone United Road No. 22 Patentee after: Chongqing Yuntianhua hanen New Material Development Co Ltd Patentee after: Yutianhua Co., Ltd., Yunnan Address before: 657800 Zhaotong City, Yunnan province Shuifu county to jingjiaba Patentee before: Yutianhua Co., Ltd., Yunnan |