CN206394159U - A kind of photovoltaic back PVDF thin film of double-layer coextrusion - Google Patents
A kind of photovoltaic back PVDF thin film of double-layer coextrusion Download PDFInfo
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Abstract
The utility model provides a kind of photovoltaic back PVDF thin film of double-layer coextrusion, includes the internal layer and outer layer of two layers of melting co-extrusion formation, described internal layer is high refractive index layer, and outer layer is polyvinylidene fluoride layer；High refractive index layer includes PVDF, modified titanium dioxide, PMMA, functional resin, antioxidant and anti ultraviolet agent；Polyvinylidene fluoride layer includes PVDF, PMMA, titanium dioxide, antioxidant and anti ultraviolet agent.Above-mentioned high refractive index layer and polyvinylidene fluoride layer raw material are granulated respectively, photovoltaic back is caused to be each provided with different functions with the internal layer and outer layer of PVDF thin film by the production technology of double-layer coextrusion again, the high reflection material of internal layer addition, the utilization rate of sunshine can be effectively improved, it is that the reflectivity of sunshine can reach more than 90% in the range of 380 1100nm in wavelength.
Description
Technical field
The utility model belongs to optics technical field of membrane, and in particular to a kind of photovoltaic back PVDF of double-layer coextrusion（It is poly-
Vinylidene）Film.
Background technology
Photovoltaic back is located at the outermost layer of module backside, and in outdoor environment protects photovoltaic cell component not invaded by steam
Erosion, the anti-oxidation of blocking oxygen, high-low temperature resistant, good insulating properties and ageing-resistant performance, decay resistance can reflect sun
Light, improves the transformation efficiency of component, with higher infrared emittance, can reduce the temperature of component.Photovoltaic back typically has
There is three-decker, outer protective layer has good environment resistant erosiveness.In order to there is good weatherability, backboard is typically required
Cladding material is fluorine material, and PVF and PVDF are most common two kinds of fluorine materials, because PVDF density is PVF 1.3-
1.4 times, many fluorine atoms on molecular structure, so it is finer and close than PVF, more preferable more resistant to time, barrier.Due to photovoltaic group
The light utilization efficiency of part is low, therefore a kind of high reflectance photovoltaic back of offer is necessary with PVDF thin film.
The production and processing method of current PVDF thin film mainly has extrusion blowing and extrusion the tape casting.Wherein extrude the tape casting
The film of production is due to vertically and horizontally performance balance, the excellent feature of unstressed, heat sealability, and optimum is used to seal.But extrusion curtain coating
Equipment investment is big, limits its instream factor.And the equipment for extruding blowing is simple, small investment；It is strong through inflation drawing-off mechanics
Degree is higher；Without rim charge, cost is low；Film is simple into cylindric preparation technology；Processing and forming operation is easy, so in plastic sheeting,
About 80% is blow moulding production.At present, extrusion blowing can be divided into individual layer extrusion and multilayer according to the quantitative classification of extruder
Extrusion, because the membrane structure performance that individual layer is extruded is single, can not meet the diversified demand in market.And multi-layer co-extruded blown film
Technique often uses two or more plastics varieties, or uses the extruder of more than two, the parison of coextruded multilayer structure.China
Number of patent application 201610353453.1 discloses one side frosted high reflection solar energy backboard PVDF thin film and preparation method thereof.
The PVDF thin film includes outer layer, intermediate layer, internal layer and the reflector layers compound successively of four layers of melting co-extrusions formation, and its outer layer and
The material of internal layer is PVDF, and the material of reflector layer is acrylic acid-grafted Kynoar, and grafting rate is low, and its actual reflection
Rate is not high, complex process, and cost is high.
The content of the invention
The utility model purpose is to provide a kind of photovoltaic back PVDF thin film of double-layer coextrusion for above-mentioned weak point,
The PVDF thin film can improve the reflectivity of sunshine, and then raising component improves generating efficiency to the utilization rate of sunlight.
A kind of photovoltaic back of double-layer coextrusion is to take following technical scheme to realize with PVDF thin film：
A kind of photovoltaic back of double-layer coextrusion is with PVDF thin film by the way of double-deck extrusion-blown modling, and main technical schemes are such as
Under：
A kind of photovoltaic back of double-layer coextrusion PVDF thin film includes the internal layer and outer layer of two layers of melting co-extrusion formation, described
Internal layer be high refractive index layer, outer layer is polyvinylidene fluoride layer.
Further, the thickness of described polyvinylidene fluoride layer is 8-50 microns, and the thickness of described high refractive index layer is
8-50 microns.
Further, described high refractive index layer includes 30-80 parts by weight PVDF（Kynoar）, 5-20 parts by weight change
Titanium dioxide after property, 1-20 parts by weight PMMA（Polymethyl methacrylate）, the functional resin of 1-20 parts by weight, 0.05-3 weights
Measure part antioxidant and 0.05-3 parts by weight anti ultraviolet agents.
Further, described polyvinylidene fluoride layer includes 30-80 parts by weight PVDF（Kynoar）, 1-20 parts of weight
Part PMMA（Polymethyl methacrylate）, 5-30 parts by weight titanium dioxides, 0.05-3 parts by weight antioxidant and 0.05-3 parts by weight are anti-
Ultraviolet dose.
Further, titanium dioxide carries out surface modification by silane coupler KH570 to it.
Further, described functional resin includes polyurethane resin, epoxy resin, acrylic resin, organosilicon tree
Any of fat is a variety of.
Further, described antioxidant is three (3,5- di-tert-butyl-4-hydroxyl benzyl) isocyanuric acid esters, three second two
Alcohol-bis--[3- (3- tertiary butyl-4-hydroxy -5- aminomethyl phenyls) propionic ester], 2,2 '-di-2-ethylhexylphosphine oxide-(4- methyl-6-tert butyl benzene
Phenol), 4-4 '-thiobis-(3 methy 6 tert butyl phenol), 4-4 '-butyl it is double-(3 methy 6 tert butyl phenol), the last of the ten Heavenly stems two
Sour two (2,2,6,6- tetramethyl -4- piperidyls) esters, phosphorous acid three (1,2,2,6,6- pentamethyl -4- piperidyls) ester, poly- [(1-
(β-ethyl) -2,2,6,6- tetramethyl -4- piperidyls) succinic acid], poly- { [6- [(1,1,3,3- tetramethyl butyls)-imido
Base] -1,3,5- triazine -2,4- diyls], [2- (2,2,6,6- tetramethyl -4- piperidyls)-secondary amino]-hexa-methylene-[4-
(2,2,6,6- tetramethyl -4- piperidyls)-secondary amino] in one or more.
Further, described anti ultraviolet agent is 2,2 '-dihydroxy -4,4 '-dimethoxy-benzophenone, 2- hydroxyls -5-
It is chlorobenzophenone, 2- (2 '-hydroxyl -5 '-tert-butyl-phenyl) BTA, 2- (2 '-hydroxyl -5 '-aminophenyl) BTA, double
Bisphenol a disalicylate, 2- (2- hydroxyls -3,5- di-tert-pentyl-phenyl) BTA, 2,2 '-(Isosorbide-5-Nitrae-phenylene) double -4H-3,1-
Benzoxazine -4- ketone, 2- (2 '-hydroxyl -3 ', 5 ' -3,5-dimethylphenyl) BTA, 2- (2 '-methyl -4 '-hydroxy phenyl) benzene
And triazole, double-(2- methoxyl group -4- hydroxyl -5- benzoylphenyls) methane, 2- (2 '-hydroxy-5-methyl base phenyl) benzo three
Azoles, 2- (2 '-hydroxy-5-methyl base phenyl) -5- butyl's esters BTA, 2- hydroxyl -4- alkoxy benzophenones, 3,5- bis-
Tertiary butyl-4-hydroxy-benzoic acid cetyl ester, three (1,2,2,6,6- pentamethyl -4- piperidyls) phosphite esters, decanedioic acid
Double -2,2,6,6- tetramethyl piperidine alcohol esters, succinic acid and 4- hydroxyls -2,2, polymer, the N of 6,6- tetramethyl -1- piperidine alcohols,
N '-bis- (2,2,6,6- tetramethyl -4- piperidyls) -1,6- hexamethylene diamines and 2,4- bis- chloro- 6- (1,1,3,3- tetramethyl butyl) ammonia
Polymer, the N of base -1,3,5-triazines, N '-bis- (2,2,6,6- tetramethyl -4- piperidyls) -1,6- hexamethylene diamines and 2,4- bis- are chloro-
One or more in the polymer of 6- (4- morpholinyls) -1,3,5-triazines.
A kind of preparation method of the photovoltaic back PVDF thin film of double-layer coextrusion, its specific preparation process is as follows：
（1）It is 1 to weigh weight ratio:10-1:20 silane crosslinker KH570 and titanium dioxide, puts it into mixed at high speed and stirs
Mix in machine, it is 50-100rpm to control the rotating speed mixed, temperature is 70-90 DEG C, and mixing time is 20-40min, is changed
Titanium dioxide after property；
（2）By titanium dioxide modified in the PVDF of above-mentioned high refractive index layer, step 1, PMMA, functional resin, antioxygen
Agent and anti ultraviolet agent are carried out after high mix, and are granulated with double screw extruder, obtain the pellet of high refractive index layer；
（3）After all materials blending in above-mentioned polyvinylidene fluoride layer, granulated with double screw extruder, obtain poly- inclined
The pellet of PVF layer；
（4）By conveying system by the pellet and the pellet of polyvinylidene fluoride layer of the high refractive index layer obtained in step 2 and 3
Put into respectively in internal layer and outer layer single screw extrusion machine, the temperature for controlling ectonexine single screw extrusion machine is 180 DEG C -240 DEG C,
Rotating speed is 60-500rpm；
（5）Molten mass in internal layer and outer layer single screw extrusion machine confluxes in die head, extruded shape film forming after conveying, shearing
Bubble, mouthful interior cold wind is blown into film bubble by interior cold wind, makes its inflation, then is blown into outer cold wind by outer cold wind mouthful, through outer cold wind and
Foam stabilizing frame is stable, into collapser after press from both sides flat；
（6）Continue to compress traction, flattening by deflector roll after folder is flat, and sanction film is carried out by cut-off knife, be finally introducing crimping roller volume
The photovoltaic back PVDF thin film of double-layer coextrusion is made after song.
Compared with prior art, the beneficial effects of the utility model are：1）Internal layer is high refractive index layer, can use crosslinkable silane
Join agent KH570 to TiO2Surface is modified, and reduces TiO2Reunion, the flatness on enhancing PVDF thin film surface, while functional resin
Addition contribute to improve PVDF thin film reflectivity；The polyvinylidene fluoride layer of outer layer has very strong weatherability, can extend
The service life of film；2）The fluorine film thicknesses of layers distribution that double-layer coextrusion goes out is wider；3）Interior cold wind adjusting film can be passed through
Steep to control the thickness of film, allow it to reach defined numerical value, improve the uniformity of thickness, and make the control of its thickness uniformity 5%
Within；5）Outer cold wind is mainly used in controlling the stability of film bubble, reduces fluorine film edge slack phenomenon.
Brief description of the drawings
Below with reference to accompanying drawing, the utility model is described in further detail：
Fig. 1 is a kind of structural representation of the photovoltaic back PVDF thin film of double-layer coextrusion.
Reference：1st, high refractive index layer；2nd, polyvinylidene fluoride layer.
Embodiment
With reference to embodiment and accompanying drawing, embodiment of the present utility model is further described.Following reality
Apply example to be only used for more clearly illustrating the technical solution of the utility model, and protection of the present utility model can not be limited with this
Scope.
A kind of photovoltaic back PVDF thin film of double-layer coextrusion, includes the internal layer and outer layer of two layers of melting co-extrusion formation, institute
The internal layer stated is high refractive index layer 1, and outer layer is polyvinylidene fluoride layer 2.
Further, the thickness of described polyvinylidene fluoride layer 2 is 8-50 microns, the thickness of described high refractive index layer 1
For 8-50 microns.
Further, described high refractive index layer 1 includes 30-80 parts by weight PVDF（Kynoar）, 5-20 parts by weight
Modified titanium dioxide, 1-20 parts by weight PMMA（Polymethyl methacrylate）, the functional resin of 1-20 parts by weight, 0.05-3
Parts by weight antioxidant and 0.05-3 parts by weight anti ultraviolet agents.
Further, described polyvinylidene fluoride layer 2 includes 30-80 parts by weight PVDF（Kynoar）, 1-20 parts of weights
Measure part PMMA（Polymethyl methacrylate）, 5-30 parts by weight titanium dioxides, 0.05-3 parts by weight antioxidant and 0.05-3 parts by weight
Anti ultraviolet agent.
Further, titanium dioxide carries out surface modification by silane coupler KH570 to it.
Further, described functional resin includes polyurethane resin, epoxy resin, acrylic resin, organosilicon tree
Any of fat is a variety of.
Further, described antioxidant is three (3,5- di-tert-butyl-4-hydroxyl benzyl) isocyanuric acid esters, three second two
Alcohol-bis--[3- (3- tertiary butyl-4-hydroxy -5- aminomethyl phenyls) propionic ester], 2,2 '-di-2-ethylhexylphosphine oxide-(4- methyl-6-tert butyl benzene
Phenol), 4-4 '-thiobis-(3 methy 6 tert butyl phenol), 4-4 '-butyl it is double-(3 methy 6 tert butyl phenol), the last of the ten Heavenly stems two
Sour two (2,2,6,6- tetramethyl -4- piperidyls) esters, phosphorous acid three (1,2,2,6,6- pentamethyl -4- piperidyls) ester, poly- [(1-
(β-ethyl) -2,2,6,6- tetramethyl -4- piperidyls) succinic acid], poly- { [6- [(1,1,3,3- tetramethyl butyls)-imido
Base] -1,3,5- triazine -2,4- diyls], [2- (2,2,6,6- tetramethyl -4- piperidyls)-secondary amino]-hexa-methylene-[4-
(2,2,6,6- tetramethyl -4- piperidyls)-secondary amino] in one or more.
Further, described anti ultraviolet agent is 2,2 '-dihydroxy -4,4 '-dimethoxy-benzophenone, 2- hydroxyls -5-
It is chlorobenzophenone, 2- (2 '-hydroxyl -5 '-tert-butyl-phenyl) BTA, 2- (2 '-hydroxyl -5 '-aminophenyl) BTA, double
Bisphenol a disalicylate, 2- (2- hydroxyls -3,5- di-tert-pentyl-phenyl) BTA, 2,2 '-(Isosorbide-5-Nitrae-phenylene) double -4H-3,1-
Benzoxazine -4- ketone, 2- (2 '-hydroxyl -3 ', 5 ' -3,5-dimethylphenyl) BTA, 2- (2 '-methyl -4 '-hydroxy phenyl) benzene
And triazole, double-(2- methoxyl group -4- hydroxyl -5- benzoylphenyls) methane, 2- (2 '-hydroxy-5-methyl base phenyl) benzo three
Azoles, 2- (2 '-hydroxy-5-methyl base phenyl) -5- butyl's esters BTA, 2- hydroxyl -4- alkoxy benzophenones, 3,5- bis-
Tertiary butyl-4-hydroxy-benzoic acid cetyl ester, three (1,2,2,6,6- pentamethyl -4- piperidyls) phosphite esters, decanedioic acid
Double -2,2,6,6- tetramethyl piperidine alcohol esters, succinic acid and 4- hydroxyls -2,2, polymer, the N of 6,6- tetramethyl -1- piperidine alcohols,
N '-bis- (2,2,6,6- tetramethyl -4- piperidyls) -1,6- hexamethylene diamines and 2,4- bis- chloro- 6- (1,1,3,3- tetramethyl butyl) ammonia
Polymer, the N of base -1,3,5-triazines, N '-bis- (2,2,6,6- tetramethyl -4- piperidyls) -1,6- hexamethylene diamines and 2,4- bis- are chloro-
One or more in the polymer of 6- (4- morpholinyls) -1,3,5-triazines.
Embodiment 1
A kind of photovoltaic back PVDF thin film of double-layer coextrusion, its specific preparation process is as follows：（1）Weigh the titanium of 10 weight
White powder and 1 parts by weight silane crosslinker KH570, put it into mixed at high speed mixer, and the rotating speed for controlling mixing is
100rpm, temperature is 75 DEG C, and mixing time is 30min, obtains modified titanium dioxide, is changed by carrying out surface to titanium dioxide
Property, it can effectively reduce reunion；（2）Weigh titanium modified in the PVDF30 parts by weight of high refractive index layer 1,5 parts by weight steps 1
White powder, 5 parts by weight PMMA, 10 parts by weight propylene acid resins, 1 parts by weight triethylene glycol-bis--[3- (3- tertiary butyl-4-hydroxies -5-
Aminomethyl phenyl) propionic ester] and 1 parts by weight 1- benzoxazine -4- ketone carry out it is high mixed after, granulated, obtained with double screw extruder
To the pellet of high refractive index layer 1；（3）Weigh 30 parts by weight PVDF, 10 parts by weight titanium dioxides, 5 parts by weight PMMA, 1 parts by weight three
Ethylene glycol-bis--[3- (3- tertiary butyl-4-hydroxy -5- aminomethyl phenyls) propionic ester] and 1 parts by weight 1- benzoxazine -4- ketone are carried out
After height is mixed, is granulated with double screw extruder, obtain the pellet of polyvinylidene fluoride layer 2；（4）The height that will be obtained in step 2 and 3
The pellet of reflectivity 1 and the pellet of polyvinylidene fluoride layer 2 are put into internal layer and outer layer single screw extrusion machine respectively, in control
The temperature of outer layer single screw extrusion machine is 200 DEG C, and rotating speed is 60rpm；（5）Molten mass in internal layer and outer layer single screw extrusion machine
Conflux after conveying, shearing in die head, be extruded into film bubble, interior cold wind is blown into film bubble by interior cold wind mouthful, makes its inflation,
Outer cold wind mouthful is blown into by outer cold wind again, it is stable through outer cold wind and foam stabilizing frame, into collapser after press from both sides flat；（6）Continue after folder is flat by
Deflector roll compresses traction, flattening, and carries out sanction film by cut-off knife, is finally introducing the photovoltaic back that double-layer coextrusion is made after crimping roller curling
Plate PVDF thin film, obtained PVDF thin film internal layer is high refractive index layer 1, and thickness is 10 microns, and outer layer is polyvinylidene fluoride layer
2, thickness is 10 microns.The PVDF thin film and thickness are combined into KPK backboards for 180 microns of PET film by polyurethane glue
Afterwards, the reflectivity that backboard is measured with spectrophotometer is 90%.
Embodiment 2
A kind of photovoltaic back PVDF thin film of double-layer coextrusion, its specific preparation process is as follows：（1）Weigh the titanium of 15 weight
White powder and 1 parts by weight silane crosslinker KH570, put it into mixed at high speed mixer, and the rotating speed for controlling mixing is
100rpm, temperature is 80 DEG C, and mixing time is 30min, obtains modified titanium dioxide, is changed by carrying out surface to titanium dioxide
Property, it can effectively reduce reunion；（2）Weigh modified in the PVDF45 parts by weight of high refractive index layer 1,10 parts by weight steps 1
Titanium dioxide, 10 parts by weight PMMA, 10 parts by weight propylene acid resins, 3 parts by weight triethylene glycols-bis--[3- (the 3- tert-butyl group -4- hydroxyls
Base -5- aminomethyl phenyls) propionic ester] and 3 parts by weight 1- benzoxazine -4- ketone carry out it is high mixed after, made with double screw extruder
Grain, obtains the pellet of high refractive index layer 1；（3）Weigh 45 parts by weight PVDF, 15 parts by weight titanium dioxides, 10 parts by weight PMMA, 3 weights
Measure part triethylene glycol-bis--[3- (3- tertiary butyl-4-hydroxy -5- aminomethyl phenyls) propionic ester] and 3 parts by weight 1- benzoxazines -4-
Ketone is carried out after high mix, and is granulated with double screw extruder, obtains the pellet of polyvinylidene fluoride layer 2；（4）It will be obtained in step 2 and 3
To the pellet of high refractive index layer 1 and the pellet of polyvinylidene fluoride layer 2 put into respectively in internal layer and outer layer single screw extrusion machine,
The temperature for controlling ectonexine single screw extrusion machine is 190 DEG C, and rotating speed is 60rpm；（5）In internal layer and outer layer single screw extrusion machine
Molten mass confluxes in die head after conveying, shearing, is extruded into film bubble, and interior cold wind is blown into film bubble by interior cold wind mouthful, is made
Its inflation, then outer cold wind mouthful is blown into by outer cold wind, it is stable through outer cold wind and foam stabilizing frame, into collapser after press from both sides flat；（6）After folder is flat
Continue to compress traction, flattening by deflector roll, and sanction film is carried out by cut-off knife, double-layer coextrusion is made after being finally introducing crimping roller curling
Photovoltaic back PVDF thin film, obtained PVDF thin film internal layer is high refractive index layer 1, and thickness is 10 microns, and outer layer is to gather inclined fluorine
Pvdf layer 2, thickness is 12.5 microns.The PVDF thin film is combined into thickness for 180 microns of PET film by polyurethane glue
After KPK backboards, the reflectivity that backboard is measured with spectrophotometer is 91.5%.
Embodiment 3
A kind of photovoltaic back PVDF thin film of double-layer coextrusion, its specific preparation process is as follows：（1）Weigh the titanium of 20 weight
White powder and 1 parts by weight silane crosslinker KH570, put it into mixed at high speed mixer, and the rotating speed for controlling mixing is
100rpm, temperature is 80 DEG C, and mixing time is 30min, obtains modified titanium dioxide, is changed by carrying out surface to titanium dioxide
Property, it can effectively reduce reunion；（2）Weigh modified in the parts by weight of PVDF 60 of high refractive index layer 1,5 parts by weight steps 1
Titanium dioxide, 8 parts by weight PMMA, 10 parts by weight propylene acid resins, 3 parts by weight triethylene glycols-bis--[3- (3- tertiary butyl-4-hydroxies-
5- aminomethyl phenyls) propionic ester] and 3 parts by weight 1- benzoxazine -4- ketone carry out it is high mixed after, granulated with double screw extruder,
Obtain the pellet of high refractive index layer 1；（3）Weigh 60 parts by weight PVDF, 25 parts by weight titanium dioxides, 8 parts by weight PMMA, 3 parts by weight
Triethylene glycol-bis--[3- (3- tertiary butyl-4-hydroxy -5- aminomethyl phenyls) propionic ester] and 3 parts by weight 1- benzoxazine -4- ketone enter
After row height is mixed, is granulated with double screw extruder, obtain the pellet of polyvinylidene fluoride layer 2；（4）By what is obtained in step 2 and 3
The pellet of high refractive index layer 1 and the pellet of polyvinylidene fluoride layer 2 are put into internal layer and outer layer single screw extrusion machine respectively, control
The temperature of ectonexine single screw extrusion machine is 190 DEG C, and rotating speed is 60rpm；（5）Melting in internal layer and outer layer single screw extrusion machine
Body confluxes in die head after conveying, shearing, is extruded into film bubble, and interior cold wind is blown into film bubble by interior cold wind mouthful, it is blown
It is swollen, then outer cold wind mouthful is blown into by outer cold wind, it is stable through outer cold wind and foam stabilizing frame, into collapser after press from both sides flat；（6）Continue after folder is flat
Traction, flattening are compressed by deflector roll, and sanction film is carried out by cut-off knife, the photovoltaic that double-layer coextrusion is made after crimping roller curling is finally introducing
Backboard PVDF thin film, obtained PVDF thin film internal layer is high refractive index layer 1, and thickness is 12 microns, and outer layer is Kynoar
Layer 2, thickness is 13 microns.The PVDF thin film and thickness are combined into the KPK back ofs the body for 180 microns of PET film by polyurethane glue
After plate, the reflectivity that backboard is measured with spectrophotometer is 92%.
The production technology gone out by double-layer coextrusion is so that photovoltaic back is each provided with not with the internal layer and outer layer of PVDF thin film
Addition high reflection material in same function, inner layer extruder, obtained PVDF thin film internal layer can improve the utilization of sunshine
Rate, is that the reflectivity of sunshine can reach more than 90%, so as to improve photovoltaic module in the range of 380-1100nm in wavelength
Generation Rate.Prior art often coats a floor height reflectivity to improve its reflectivity, but this work on the surface of photovoltaic back
Skill complex operation, light utilization efficiency be not high and the life-span is not long, and the utility model technique is simple, and light utilization efficiency is high, long lifespan, Ke Yiyou
Effect improves the reflectivity of sunshine.
Claims (2)
1. the photovoltaic back PVDF thin film of a kind of double-layer coextrusion, it is characterised in that include the internal layer of two layers of melting co-extrusion formation
And outer layer, described internal layer is high refractive index layer, and outer layer is polyvinylidene fluoride layer.
2. the photovoltaic back PVDF thin film of a kind of double-layer coextrusion according to claim 1, it is characterised in that described is poly-
The thickness of vinylidene fluoride layer is 8-50 microns, and the thickness of described high refractive index layer is 8-50 microns.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106585010A (en) * | 2016-11-29 | 2017-04-26 | 中天科技精密材料有限公司 | PVDF film for double-layer co-extrusion photovoltaic back plate and preparation method thereof |
| CN112951936A (en) * | 2021-02-20 | 2021-06-11 | 浙江中聚材料有限公司 | High-reflectivity solar cell backboard and preparation process thereof |
-
2016
- 2016-11-29 CN CN201621292523.9U patent/CN206394159U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106585010A (en) * | 2016-11-29 | 2017-04-26 | 中天科技精密材料有限公司 | PVDF film for double-layer co-extrusion photovoltaic back plate and preparation method thereof |
| CN112951936A (en) * | 2021-02-20 | 2021-06-11 | 浙江中聚材料有限公司 | High-reflectivity solar cell backboard and preparation process thereof |
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