CN103151407B - Solar cell rear panel and preparation method thereof - Google Patents
Solar cell rear panel and preparation method thereof Download PDFInfo
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- CN103151407B CN103151407B CN201310040961.0A CN201310040961A CN103151407B CN 103151407 B CN103151407 B CN 103151407B CN 201310040961 A CN201310040961 A CN 201310040961A CN 103151407 B CN103151407 B CN 103151407B
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Abstract
The invention relates to the technical field of solar cells, in particular to a solar cell rear panel and a preparation method of the solar cell rear panel. The solar cell rear panel and the preparation method of the solar cell rear panel aim at solving the problems that an existing solar cell rear panel is high in production cost and poor in interlayer adhesiveness. The solar cell rear panel comprises a resin sheet basic layer. Chemical pretreatment layers are coated on two surfaces of the basic layer. A bonding layer is coated on each pretreatment layer. A protection layer is coated on each bonding layer. The chemical pretreatment layers are composed of water-solubility polyurethane, water-solubility acrylic ester or modified water-solubility polyester in a solidified mode. The solar cell rear panel is high in binding power between the polyester basic layer and the fluorine material protection layer and low in production cost. The preparation method of the solar cell rear panel is simple in process and easy to operate.
Description
Technical field
The present invention relates to technical field of solar batteries, be specifically related to a kind of solar cell backboard (or claiming solar energy backboard) and preparation method thereof.
Background technology
Solar cell is the device of electric energy by photoelectric effect light energy conversion.Owing to having the advantages such as permanent, spatter property, flexibility, it is considered to a kind of novel energy of following main development, and in the near future, solar cell can Substitute For Partial conventional energy resource, becomes the main body of world energy supplies.
Solar cell is a stepped construction normally, is followed successively by clear glass cover plate/sealant ethene-vinyl acetate copolymer (EVA glue)/cell piece/EVA glue/backboard from top to bottom.Whole solar cell is by framing up form sealing four sides after above-mentioned each material lamination again.The Main Function of its dorsulum is the overall mechanical strength improving solar panel, intercepts water vapor permeable in sealant, to ensure the useful life of cell piece simultaneously.Therefore, solar cell backboard must have good electrical breakdown withstand, ageing-resistant, weather, the characteristic such as corrosion-resistant.
Current solar cell backboard is produced by multilayer film thermoforming way mostly.For the most frequently used TPT, its preparation method is that independently film is hot-forming by the bonding of macromolecule adhesive with polyvinyl fluoride/PETG/polyvinyl fluoride (being called for short PVF/PET/PVF) three layers.Pet layer is wherein as matrix, and main rising is insulated and supporting role; Two outer field PVF, due to molecular skeleton containing fluorin radical, can play ageing-resistant and corrosion-resistant effect.In order to obtain the performances such as better barrier, weatherability, Kynoar (PVDF) can be used to substitute PVF.
There is the problems such as the high and interlaminar adhesion of material cost is low in the production of Present Domestic solar energy backboard, in backsheet layer, the production of PET basement membrane is mature on the whole, but the production technology difficulty of PVF or PVDF is larger, almost can not autonomous production, substantially rely on external import, cause the defect that backboard membrane material cost is higher thus.In addition, because fluoropolymer surface can be low, making PET and PVF(or PVDF) bonding strength is inadequate between rete, and easily cause and be separated from each other between each layer of backboard membrane and cause the hydraulic performance decline such as barrier, weatherability, corrosion resistance of whole backboard membrane, thus affect the useful life of battery.Therefore, adopt multilayer film hot press forming technology, very harsh to the requirement of macromolecule adhesive formula.
Between current solution backboard cost and each layer, the method for caking property problem has two kinds, on the one hand, uses fluororesin-coated formation fluorine layer to carry out alternative traditional fluorine film, reaches the object reduced costs; On the other hand, carry out corona treatment at fluorine film or polyester base film surface, suitably improve the caking property between two membranes.Publication number is CN101272903, publication date is the Chinese invention patent of on 09 24th, 2008, provide a kind of solar cell backboard adopting fluorine-containing coat replacement fluorine film, this fluorine-containing coat is the fluoropolymer having imported solidification functional group, in order to improve the caking property between fluorine layer and basic unit or sealant layer.Publication number is CN101515603A, publication date is the Chinese invention patent application of on 08 26th, 2009, provide a kind of solar cell backboard, give three kinds of versions: the first is in sheet material one side of impermeability coating fluorine-containing coat, at another side compound fluorine-contained film; The second is respectively coated with fluorine-containing coat in the sheet material two sides of impermeability; The third is in sheet material one side of impermeability coating fluorine-containing coat, then in the outer coating surface coating of fluorine-containing coat, finally in sheet material another side coating fluorine-containing coat.The backboard membrane of above structure partly or entirely replaces fluorine rete by coating fluorine-containing coat, thus reduces material cost to a certain extent, also improves the caking property between each layer of backboard membrane from the improvement of fluorine material or adhesive.
Due to the permanence (needing to use more than 20 years out of doors) of solar cell service time, whole battery component be kept to have good barrier, weatherability and corrosion resistance, and to ensure its useful life, the caking property between each layer of backboard membrane is most important.The applicant thinks except improving fluororesin or adhesive, or carries out outside corona treatment to fluorine film or polyester base film surface, is necessary to make further improvements polyester base material, to improve the adhesive property between each layer of backboard membrane as far as possible.
Summary of the invention
In order to the production cost solving existing solar energy backboard is high and the defect of interlaminar adhesion difference, the invention provides a kind of solar cell backboard and preparation method thereof.Cohesive force between the polyester base film of solar cell backboard provided by the invention and fluorine material protection layer is higher, and production cost is lower.Preparation method's technique of solar cell backboard provided by the invention is simple, is easy to operation.
For achieving the above object, the present invention adopts following technical scheme:
The invention provides a kind of solar cell backboard, described backboard comprises resin sheet basic unit (abbreviation basic unit/basement membrane, or base copolyester/polyester base film); Two surfaces of described basic unit are coated with Chemical Pretreatment layer, described pretreatment layer is coated with tack coat, described tack coat is coated with protective layer; Described Chemical Pretreatment layer is formed by soluble polyurethane, water-soluble acrylic ester or modified soluble curable polyester.
Described resin sheet basic unit adopts material to be polyester material, is selected from the one in PETG (PET), polybutylene terephthalate (PBT) (PBT), polyethylene naphthalate (PEN) and modification by copolymerization resin thereof.
The thickness of described resin sheet basic unit is 100-250 μm.
Described polyester material is prepared into membranaceous or laminated structure by stretch processes.
Further, in described resin sheet basic unit, be added with 5-40%(weight percentage) inorganic particle, the particle diameter of described inorganic particle is 0.01-1 μm.
Described inorganic particle is packing material, is selected from the combination of a kind of in aluminium oxide, aluminum sulfate, calcium carbonate, magnesium carbonate, alumina silicate, magnesium silicate, silicon dioxide or titanium dioxide or at least two kinds.Being added with of above-mentioned inorganic filling material helps the weather resistance and the ageing-resistant performance that improve basic unit.
Further, described protective layer is the fluorine-containing coat that fluorine resin coating is formed.
Described fluorine resin coating is mixed emulsion, comprises fluoropolymer, solvent, curing agent, filler and auxiliary agent.Described fluoropolymer is selected from the combination of a kind of in polyvinyl fluoride, Kynoar, polytetrafluoroethylene, poly(perfluoropropene), chlorotrifluoroethylene-alkyl vinyl ether, vinylidene fluoride resin, Kynoar-tetrafluoroethene-hexafluoro isopropyl olefine resin copolymer or at least two kinds; Described solvent is selected from the combination of a kind of in toluene, ortho-xylene, acetone, butanone, ethyl acetate or butyl acetate or at least two kinds; Described curing agent is selected from the combination of a kind of in divinylbenzene, trimethylol-propane trimethacrylate, triallyl cyanurate, 2-hydroxy-2-methyl-1-phenylacetone or at least two kinds; Described filler is selected from the combination of a kind of in quartz particles, mica particles, titanium dioxide granule or at least two kinds.Described fluorine resin coating is directly coated in the surface of described tack coat, obtains fluorine-containing protective layer after hot curing.
Further, described bonding layer material comprises resin matrix and curing agent.
Described resin matrix can select polyacrylate system with curability functional group or Polyester, as poly-hydroxy acrylate, poly-amino acrylates, poly-carboxy acrylic ester, the polyester with hydroxyl, the polyester etc. with carboxyl, wherein, preferably there is the polyester with carboxyl or hydroxyl of better caking property and hydrolytic resistance.Described curing agent can select the one in epoxy curing agent, isocyanate curing agent or carbodiimides curing agent.
Further, described tack coat is formed by the adhesive curing of bi-component hot setting.
Further, the thickness of described resin sheet basic unit is 100-250 μm, and the thickness of described protective layer is 20-50 μm, and the thickness of described tack coat is 2-10 μm.
On the other hand, the invention provides the preparation method of above-mentioned solar cell backboard, in this preparation method, described Chemical Pretreatment layer chemical material used is first mixed with coating fluid (aqueous solution), then by coating solution in substrate surface, moisture removing in the coating finally formed by coating fluid, forms Chemical Pretreatment layer.
Further, described Chemical Pretreatment layer chemical material used is selected from soluble polyurethane, water-soluble acrylic ester or modified soluble polyester; Described coating fluid comprises following component (described percentage is weight percentage):
Soluble polyurethane, water-soluble acrylic ester or modified soluble polyester 5%-10%
Crosslinking agent 1%-2%
Water 80%-90%
Isopropyl alcohol 4%-8%,
The weight percentage of above-mentioned soluble polyurethane, water-soluble acrylic ester or modified soluble polyester is the percentage that its solid content accounts for coating fluid total weight.Above-mentioned content is too low does not reach effectiveness, too high, and processing technology is had any problem.
Further, described preparation method comprises the steps:
(1) inorganic particle and polyester material are passed through melting mixing, extruding pelletization, be prepared into the masterbatch containing 50% inorganic filler;
(2) preparation of resin sheet basic unit: 30% polyester is had light material, after the 30% anti-stick mineral filler masterbatch connecting polyester masterbatch and 40% step (1) gained mixes, melt extrudes, longitudinal stretching, after being cooled to room temperature, online applied coating solution basement membrane both sides while, coating weight is 5-15g/m
2, after pre-heating drying, cross directional stretch, thermal finalization, is cooled to room temperature, and traction, rolling, obtain described resin sheet basic unit;
(3) tack coat is coated with: in a surface coating bonding layer material of the resin sheet basic unit that step (2) obtains, at 120 DEG C, dry 5-10 minute, make tack coat;
(4) preparation of protective layer:
Prepare fluoro-containing coating, described fluoro-containing coating comprises fluorine resin, curing agent, curing accelerator, solvent, titanium dioxide, UV absorbent,
Fluorine resin is dissolved in solvent, then adds curing agent, titanium dioxide filler, UV absorbent, stir and form fluorine-containing protection layer for paint;
Then by fluorine-containing protection layer for paint blade coating on tack coat, at 120 DEG C, dry 20-30 minute, obtained dried thickness is the protective layer of 20-50 μm;
(5) tack coat and protective layer is in kind coated with on another surface of base copolyester, obtained described solar cell backboard.
Further, in described step (2), concrete process conditions are as follows:
Polyester there is light material, after the anti-stick mineral filler masterbatch connecting polyester masterbatch and step (1) gained mixes, melting at 260-280 DEG C, extrude slab, at 60-90 DEG C, longitudinal stretching 2.5-3.5 doubly, after being cooled to room temperature, carry out online applied coating solution in basement membrane both sides simultaneously, at 80-100 DEG C after pre-heating drying, at 100-120 DEG C, cross directional stretch 3-4 doubly, thermal finalization 20-30 second at 200-230 DEG C.
Further, in described step (4), fluoro-containing coating is prepared according to following formula:
Further, the formula following (described content is weight percentage) of described Chemical Pretreatment layer coating fluid:
On the other hand, the invention provides a kind of solar cell backboard film, described backboard comprises resin sheet basic unit; Two surfaces of described basic unit are provided with Chemical Pretreatment layer, and described pretreatment layer is outside equipped with tack coat, and described tack coat is outward protective layer.
Further, the material of described Chemical Pretreatment layer is selected from soluble polyurethane, water-soluble acrylic ester or modified soluble polyester.
Further, described protective layer is fluor resin coating.
Compared with prior art; solar cell backboard provided by the invention; by carrying out Chemical Pretreatment to substrate surface, making basic unit two sides be added with the chemical substance can improving basic unit and protective layer compatibility, obtaining and fluororesin and the better basement membrane of adhesive compatibility.The basic unit of solar cell backboard provided by the invention and protective layer bond more firm.The present invention, by carrying out Chemical Pretreatment to backboard substrate surface, makes basic unit and protective layer compound tense need not make particular/special requirement to adhesive and fluororesin, can adopt any one fluororesin known and adhesive in field, only need consider its result of use.Therefore, solar cell backboard provided by the invention not only has better adhesive property, barrier, weatherability, and reduces the production technology of Material Cost and solar cell backboard and the difficulty of component design.Preparation method's technique of solar cell backboard provided by the invention is simple, is easy to operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of solar cell backboard provided by the invention;
Wherein, 1 is basic unit, and 2 is protective layer, and 3 is tack coat, and 4 is Chemical Pretreatment layer.
Embodiment
As shown in Figure 1, solar cell backboard provided by the invention comprises resin sheet basic unit 1; Two surfaces of described basic unit 1 are coated with Chemical Pretreatment layer 4, and described pretreatment layer 4 is coated with tack coat 3, and described tack coat 3 is coated with protective layer 2.
The preparation method of the solar cell backboard described in following embodiment 1-4 comprises the steps:
(1) described base layer of resin material adopts following formula (described content is weight percentage):
PET has light material 50%
PET is anti-stick connects masterbatch 30%
Titanium dioxide 20%
Wherein titanium dioxide first has light material by melting mixing, extruding pelletization with 20%PET, is prepared into the PET master batch that titanium dioxide weight percentage is 50%;
(2) basic unit is prepared:
By the PET master batch that step (1) obtains, light material and the 30% anti-stick masterbatch that connects is had to mix with 30%PET.The anti-stick silicon dioxide connecting masterbatch and contain 0.25%-0.50% of described PET.
After above-mentioned polyester raw material section is mixed, melting at 260-280 DEG C, extrudes slab, and at 60-90 DEG C, longitudinal stretching 3 times, is cooled to room temperature; Be coated with process online in basement membrane two sides simultaneously, adopt different acrylate as coating fluid material respectively, coating weight is 5-15g/m
2; At 80-100 DEG C after pre-heating drying, cross directional stretch 3.5 times at 100-120 DEG C, in thermal finalization 20 second at 200-230 DEG C, is cooled to room temperature, and traction, rolling, obtain the PET basement membrane that thickness is 100-250 μm.
(3) tack coat is prepared:
Use tack coat coating fluid to be coated with in a surface of the PET basic unit that step (2) obtains, dry at 120 DEG C and within 5-10 minute, make about 5 μm of thick tack coats 3;
(4) protective layer is prepared:
Described protective layer is fluorine-containing protective finish, adopts following formula (described content is weight percentage):
Be dissolved in by fluorine resin in solvent, then add the auxiliary agent such as curing agent, filler, stir formation mixed emulsion.
Then by fluorine-containing protection layer for paint blade coating on tack coat 3, at 120 DEG C, dry 20-30 minute, the obtained dry thick protective layer 2 being about 20-50 μm.
(5) tack coat 3 and protective layer 2 is in kind coated with on another surface of PET basic unit 1, obtained solar cell backboard of the present invention.Its structure as shown in Figure 1.
The method of testing of the adhesive property of solar cell backboard provided by the invention, barrier, weatherability, is summarized as follows:
(1) caking property test
Gained rear panel compound film is cut into wide 15mm, is about the galley proof of 1m, in galley proof one end, protective layer is peeled away a little.At puller system (such as; Instron Corporation of Britain produce INSTRON universal testing machine) on clamp basic unit and protective layer respectively; stretching with the direction at 180 ° of angles makes basic unit and protective layer continue to peel away completely; read pulling force data shown during stretching, power required when obtaining stripping.Peeling force is larger, and the adhesive property of backboard membrane is better.
(2) permeability test
Barrier is characterized by water vapor transmittance, and method disclosed in reference ISO15106-3 testing standard, test environment temperature is 35 ± 5 DEG C, and relative humidity is 95 ± 5%.
(3) weatherability test
Weatherability is characterized by lamination, puncture voltage and metachromatism.Adopt method disclosed in solar panel certification/solar photovoltaic cell panel IEC61215 standard to carry out layered weighting to sample, test condition is: temperature is 85 DEG C, and relative humidity is 85%RH, time is 2000 hours, observing sample with or without layering, without being layered as OK, being layered as NO.Method disclosed in ASTMF-149 standard is adopted to carry out puncture voltage test to sample.The detection method of metachromatism is: sample is placed at 60 DEG C 1KW ultraviolet xenon lamp and irradiates 150 hours, observing with or without variable color, is OK without variable color, has variable color to be NO.
Embodiment 1
Prepare solar cell backboard by preceding method, wherein PET groundwork thickness is 175 μm, adopts acrylic emulsion as Chemical Pretreatment layer coating material, the formula following (described content is weight percentage) of coating fluid:
Above-mentioned coating fluid is 8g/m in the coating weight of substrate surface
2.The weight percentage of aforesaid propylene yogurt liquid is the percentage that the solid content of acrylic emulsion accounts for coating fluid total weight.
Above-mentioned Chemical Pretreatment layer is coated with tack coat coating fluid, described tack coat coating fluid formula following (described content is weight percentage):
By preceding method at the surface of tack coat coating fluorine protective layer, the dried thickness of fluorine protective layer is 30 μm.
Gained solar cell backboard (also can be described as composite membrane) performance measurement the results are shown in Table 1.
Embodiment 2
Prepare solar cell backboard by preceding method, wherein PET groundwork thickness is 200 μm, adopts acrylic resin as Chemical Pretreatment layer coating material, the formula following (described content is weight percentage) of coating fluid:
Above-mentioned coating fluid is 12g/m in the coating weight of substrate surface
2.The weight percentage of aforesaid propylene yogurt liquid is the percentage that the solid content of acrylic emulsion accounts for coating fluid total weight.
Following tack coat coating fluid is used to fill a prescription (described content is weight percentage):
By preceding method at the surface of tack coat coating fluorine protective layer, the dried thickness of fluorine protective layer is 28 μm.
The performance measurement of gained composite membrane the results are shown in Table 1.
Embodiment 3
Prepare solar cell backboard by preceding method, wherein PET groundwork thickness is 225 μm, adopts acrylic emulsion as Chemical Pretreatment layer coating material, the formula following (solid part mass percentage) of coating fluid:
Above-mentioned coating fluid is 10g/m in the coating weight of substrate surface
2.The weight percentage of aforesaid propylene yogurt liquid is the percentage that the solid content of acrylic emulsion accounts for coating fluid total weight.
Use following tack coat formulation for coating material (described content is weight percentage):
By preceding method at the surface of tack coat coating fluorine protective layer, the dried thickness of fluorine protective layer is 35 μm.
The performance measurement of gained composite membrane the results are shown in Table 1.
Embodiment 4
Prepare solar cell backboard by preceding method, wherein PET groundwork thickness is 250 μm, adopts polyurethane acroleic acid emulsion as Chemical Pretreatment layer coating material, the formula following (described content is weight percentage) of coating fluid:
Above-mentioned coating fluid is 8g/m in the coating weight of substrate surface
2.The weight percentage of aforesaid propylene yogurt liquid is the percentage that the solid content of acrylic emulsion accounts for coating fluid total weight.
Following tack coat coating fluid is used to fill a prescription (described content is weight percentage):
By preceding method fluorine protective layer in the coating of the surface of tack coat, the dried thickness of fluorine protective layer is 36 μm.
The performance measurement of gained composite membrane the results are shown in Table 1.
The performance test results of table 1. embodiment 1-4 gained solar cell backboard
Embodiment 5
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 100 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 1, the thickness of described tack coat is 2 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 20 μm.
The performance measurement of gained composite membrane the results are shown in Table 2.
Embodiment 6
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 250 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 2, the thickness of described tack coat is 10 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 50 μm.
The performance measurement of gained composite membrane the results are shown in Table 2.
Embodiment 7
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 150 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 3, the thickness of described tack coat is 8 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 35 μm.
The performance measurement of gained composite membrane the results are shown in Table 2.
Embodiment 8
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 150 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 4, the thickness of described tack coat is 4 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 40 μm.
The performance measurement of gained composite membrane the results are shown in Table 2.
The performance test results of table 2. embodiment 5-8 gained solar cell backboard
Comparative example 1
For comparing the effect that PET basic unit produces caking property after surface chemistry coating process, we have arranged comparative example, namely use the compound of carrying out fluorine protective layer without chemically treated PET basic unit.In comparative example the formula of PET raw material used, protective layer coating solution, tack coat coating fluid and technique identical with embodiment 1, PET groundwork thickness is 200 μm, and fluorine protective layer thickness is 30 μm.The performance measurement of gained composite membrane the results are shown in Table 3.
Comparative example 2
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 230 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 2, the thickness of described tack coat is 8 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 45 μm.
In gained composite membrane Chemical Pretreatment layer coating fluid used, soluble polyurethane content is too low, and do not reach treatment effect, film performance is poor, and its measurement result is in table 3.
Comparative example 3
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 200 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 2, the thickness of described tack coat is 6 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 40 μm.
Water-soluble acrylic ester too high levels in gained composite membrane Chemical Pretreatment layer coating fluid used, processing difficulties, cost is higher, and the solar cell backboard performance of gained is uneven, and its measurement result is in table 3.
Comparative example 4
Prepare solar cell backboard by preceding method, wherein the thickness of PET basic unit is 250 μm; Described Chemical Pretreatment layer coating fluid used comprises following component (content is weight percentage):
According to recipe configuration tack coat coating fluid described in embodiment 3, the thickness of described tack coat is 15 μm.
The formula of described protective layer is as follows:
The thickness of described protective layer is 50 μm.
Soluble polyurethane content in above-mentioned Chemical Pretreatment layer coating fluid is high, and the thickness of above-mentioned tack coat is large, and in protective layer, fluorine resin content is too low, and the combination property of gained composite membrane is poor, and its performance measurement the results are shown in Table 3.
The performance test results of table 3 comparative example 1-4 gained solar cell backboard
The performance test data of solar cell backboard provided from the embodiment shown in table 1-3 and comparative example can draw; backboard basic unit selects suitable Chemical Pretreatment layer coating fluid formula used; after surface chemistry preliminary treatment, effectively can strengthen the caking property between basic unit and protective layer.Meanwhile, select suitable component and proportioning, barrier property and the weather resistance of gained composite membrane are better.
As mentioned above, we are illustrated according to aim of the present invention.But the present invention is not limited to above-described embodiment and method, the practitioner of correlative technology field can carry out different changes and enforcement in the scope of the technology of the present invention license.
Claims (8)
1. a preparation method for solar cell backboard, is characterized in that, described backboard comprises resin sheet basic unit; Two surfaces of described basic unit are coated with Chemical Pretreatment layer, described pretreatment layer is coated with tack coat, described tack coat is coated with protective layer; Described Chemical Pretreatment layer is formed by soluble polyurethane, water-soluble acrylic ester or modified soluble curable polyester;
Described Chemical Pretreatment layer chemical material used is first mixed with coating fluid, then by coating solution in substrate surface, the moisture removing in the coating finally formed by coating fluid, forms Chemical Pretreatment layer;
Described Chemical Pretreatment layer chemical material used is selected from soluble polyurethane, water-soluble acrylic ester or modified soluble polyester; Described coating fluid comprises following component:
Described percentage is weight percentage, and the weight percentage of above-mentioned soluble polyurethane, water-soluble acrylic ester or modified soluble polyester is the percentage that its solid content accounts for coating fluid total weight.
2. the preparation method of solar cell backboard according to claim 1, is characterized in that, is added with the inorganic particle of 5-40% in described resin sheet basic unit, and the particle diameter of described inorganic particle is 0.01-1 μm.
3. the preparation method of solar cell backboard according to claim 1, is characterized in that, described protective layer is the fluorine-containing coat that fluorine resin coating is formed.
4. the preparation method of solar cell backboard according to claim 1, is characterized in that, described bonding layer material comprises resin matrix and curing agent.
5. the preparation method of solar cell backboard according to claim 1, is characterized in that, the thickness of described resin sheet basic unit is 100-250 μm, and the thickness of described protective layer is 20-50 μm, and the thickness of described tack coat is 2-10 μm.
6. the preparation method of solar cell backboard according to claim 1, is characterized in that, described preparation method comprises the steps:
(1) inorganic particle and polyester material are passed through melting mixing, extruding pelletization, be prepared into the masterbatch containing 50% inorganic filler;
(2) preparation of resin sheet basic unit: 30% polyester is had light material, after the 30% anti-stick mineral filler masterbatch connecting polyester masterbatch and 40% step (1) gained mixes, melt extrude, longitudinal stretching, after being cooled to room temperature, online applied coating solution basement membrane both sides while, coating weight is 5-15g/m
2, after pre-heating drying, cross directional stretch, thermal finalization, is cooled to room temperature, and traction, rolling, obtain described resin sheet basic unit;
(3) tack coat is coated with: in a surface coating bonding layer material of the resin sheet basic unit that step (2) obtains, at 120 DEG C, dry 5-10 minute, make tack coat;
(4) preparation of protective layer:
Prepare fluoro-containing coating, described fluoro-containing coating comprises fluorine resin, curing agent, curing accelerator, solvent, titanium dioxide, UV absorbent,
Fluorine resin is dissolved in solvent, then adds curing agent, titanium white powder, UV absorbent, stir and form fluorine-containing protection layer for paint;
Then by fluorine-containing protection layer for paint blade coating on tack coat, at 120 DEG C, dry 20-30 minute, obtained dried thickness is the protective layer of 20-50 μm;
(5) tack coat and protective layer is in kind coated with on another surface of base copolyester, obtained described solar cell backboard.
7. the preparation method of solar cell backboard according to claim 6, is characterized in that, in described step (2), concrete process conditions are as follows:
Polyester there is light material, after the anti-stick mineral filler masterbatch connecting polyester masterbatch and step (1) gained mixes, melting at 260-280 DEG C, extrude slab, at 60-90 DEG C, longitudinal stretching 2.5-3.5 doubly, after being cooled to room temperature, carry out online applied coating solution in basement membrane both sides simultaneously, at 80-100 DEG C after pre-heating drying, at 100-120 DEG C, cross directional stretch 3-4 doubly, thermal finalization 20-30 second at 200-230 DEG C.
8. the preparation method of solar cell backboard according to claim 6, is characterized in that, in described step (4), prepares fluoro-containing coating according to following formula:
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| CN103738026B (en) * | 2013-12-27 | 2016-06-15 | 四川东方绝缘材料股份有限公司 | A kind of low water vapor transmittance polyester film of polyurethane-type coating and its preparation method |
| CN110311005A (en) * | 2019-08-07 | 2019-10-08 | 河海大学常州校区 | A kind of photovoltaic light components |
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Address after: Qingfeng Road, Jiangbei District 315000 in Zhejiang city of Ningbo province No. 999 Patentee after: Ningbo, Changyang, Polytron Technologies Inc Address before: 315031 Zhejiang province Jiangbei District of Ningbo City Green Road Zhu Xiang (1) - (4) Patentee before: Ningbo Changyang Technology Co., Ltd. |
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Application publication date: 20130612 Assignee: Ningbo Changlong New Material Co.,Ltd. Assignor: NINGBO SOLARTRON TECHNOLOGY Co.,Ltd. Contract record no.: X2021330000199 Denomination of invention: The invention relates to a solar cell back plate and a preparation method thereof Granted publication date: 20150617 License type: Common License Record date: 20210831 |