CN117165052B - Ultraviolet-resistant PET composite film material for back plate and preparation method thereof - Google Patents
Ultraviolet-resistant PET composite film material for back plate and preparation method thereof Download PDFInfo
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- CN117165052B CN117165052B CN202311296539.1A CN202311296539A CN117165052B CN 117165052 B CN117165052 B CN 117165052B CN 202311296539 A CN202311296539 A CN 202311296539A CN 117165052 B CN117165052 B CN 117165052B
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- 239000000463 material Substances 0.000 title claims abstract description 92
- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 64
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 63
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 63
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims abstract description 26
- 230000032683 aging Effects 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims description 33
- 229920005989 resin Polymers 0.000 claims description 33
- 150000003609 titanium compounds Chemical class 0.000 claims description 18
- 150000003752 zinc compounds Chemical class 0.000 claims description 18
- YJVLWFXZVBOFRZ-UHFFFAOYSA-N titanium zinc Chemical group [Ti].[Zn] YJVLWFXZVBOFRZ-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- ONIOAEVPMYCHKX-UHFFFAOYSA-N carbonic acid;zinc Chemical compound [Zn].OC(O)=O ONIOAEVPMYCHKX-UHFFFAOYSA-N 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 5
- 239000011667 zinc carbonate Substances 0.000 claims description 5
- 229910000010 zinc carbonate Inorganic materials 0.000 claims description 5
- 230000002745 absorbent Effects 0.000 claims description 4
- 239000002250 absorbent Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 3
- 229910011006 Ti(SO4)2 Inorganic materials 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 238000009830 intercalation Methods 0.000 claims description 2
- 230000002687 intercalation Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- HDUMBHAAKGUHAR-UHFFFAOYSA-J titanium(4+);disulfate Chemical compound [Ti+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O HDUMBHAAKGUHAR-UHFFFAOYSA-J 0.000 claims description 2
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Inorganic materials [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 2
- 239000011686 zinc sulphate Substances 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract description 89
- 229920002799 BoPET Polymers 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 230000006750 UV protection Effects 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 7
- 150000001450 anions Chemical class 0.000 abstract description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 82
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910003074 TiCl4 Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 3
- 235000004416 zinc carbonate Nutrition 0.000 description 3
- 239000011592 zinc chloride Substances 0.000 description 3
- 235000005074 zinc chloride Nutrition 0.000 description 3
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FICQFRCPSFCFBY-UHFFFAOYSA-N 2-[bis(methylsulfanyl)methylidene]propanedinitrile Chemical compound CSC(SC)=C(C#N)C#N FICQFRCPSFCFBY-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 230000000655 anti-hydrolysis Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229940095991 ferrous disulfide Drugs 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- XLDBGFGREOMWSL-UHFFFAOYSA-N n,n'-bis[2,6-di(propan-2-yl)phenyl]methanediimine Chemical compound CC(C)C1=CC=CC(C(C)C)=C1N=C=NC1=C(C(C)C)C=CC=C1C(C)C XLDBGFGREOMWSL-UHFFFAOYSA-N 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses an anti-ultraviolet photovoltaic backboard PET composite film material and a preparation method thereof, which belong to the technical field of photovoltaic cell back films. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Description
Technical Field
The invention belongs to the technical field of photovoltaic cell back films, and particularly relates to an anti-ultraviolet photovoltaic back plate PET composite film material and a preparation method thereof.
Background
Solar energy, which is a green renewable energy source, has important significance in reducing the use of fossil energy and optimizing the energy structure. As part of this, photovoltaic energy has an increasing share in the national energy spectrum. Solar cells can directly convert solar energy into electrical energy, but in use, long-term stability and reliability of the photovoltaic module must be ensured. Therefore, materials with excellent tolerance, high ultraviolet absorptivity, flame retardance and high insulation are required to be selected to manufacture the back sheet of the photovoltaic module. The most commonly used backsheet material at present is polyethylene terephthalate (PET). The PET film has excellent optical properties, and is excellent in light transmittance, stretching resistance and aging resistance. In addition, PET is a recyclable material, which is less fluorine than some other photovoltaic materials and is more environmentally friendly during production and use. The basic strategy to avoid degradation of PET materials is to reduce the damage that occurs from radiation and to suppress the formation of free radicals by adding uv absorbers. Hydrotalcite is a double-layer inorganic compound, has excellent thermal stability and chemical stability, and has the characteristics of no toxicity, acid resistance, environmental protection and the like. Hydrotalcite is widely used in ultraviolet absorbers, catalysts, barriers, etc. based on its anion exchange properties.
The invention patent CN113321904B discloses a modified PET resin material and a solar cell backboard film. Adding 2-cyano-3, 3-diphenyl acrylic acid isooctyl ester and/or pentaerythritol tetra (2-cyano-3, 3-di-acrylic ester) into PET resin as an ultraviolet absorbent, adding N, N-di (2, 6-diisopropylphenyl) carbodiimide as an anti-hydrolysis agent to prepare a modified PET resin material, and extruding and molding the modified PET resin material by a double-screw extruder to prepare the solar cell backboard film. Compared with a pure PET film, the modified PET resin film has lower initial yellowness and higher mechanical property. However, small-molecule ultraviolet inhibitors generally have problems of high mobility, poor stability and secondary pollution.
The invention patent CN101707216A discloses a hydrotalcite-based solar photoelectric film material. The hydrotalcite-based solar photoelectric film material with adjustable band gap width and particle size is obtained by dispersing zinc sulfide and ferrous disulfide into a hydrotalcite laminate and then forming a composite film on the surface of ITO glass by a solvent evaporation method. This patent uses hydrotalcite directly for film formation, rather than an ultraviolet inhibitor.
The invention patent CN113999709A discloses an application of hydrotalcite or modified hydrotalcite as an anti-ultraviolet antioxidant in lubricating oil/grease. The hydroxyl dehydrogenation on the surface of hydrotalcite is utilized to quench free radicals generated in the photo-thermal reaction process, and simultaneously ultraviolet rays can be blocked through physical and chemical actions so as to slow down the oxidation of lubricating oil/grease.
However, the PET material may lose stability at high temperature, so that the service life of the photovoltaic module is affected, and meanwhile, the PET material has limited weather resistance, and can be decolorized and degraded when being exposed to ultraviolet rays for a long time as the photovoltaic module, so that the service effect is affected. Therefore, if the photovoltaic film material with ultraviolet resistance, ageing resistance, high transparency and high stability is prepared, the preparation method becomes an important research direction in the technical field of photovoltaic cell back films.
Disclosure of Invention
The invention aims at: in order to solve the problems, the PET composite film material of the ultraviolet-resistant photovoltaic backboard and the preparation method are provided.
The technical scheme adopted by the invention is as follows: an anti-uv photovoltaic back sheet PET composite film material comprising: PET resin, PP resin and ultraviolet absorber;
The ultraviolet absorber is zinc-titanium hydrotalcite, the film is prepared by mixing PET and hydrotalcite, the PET composite film material comprises PET resin and the ultraviolet absorber, and the ultraviolet absorber is hydrotalcite. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
In a preferred embodiment, the preparation method of the ultraviolet photovoltaic resistant back panel PET composite film material comprises the following steps:
s1: firstly, weighing raw materials for preparing the PET composite film material of the anti-ultraviolet photovoltaic backboard, and weighing: 700-990 parts of PET resin, 10-200 parts of PP resin and 10-100 parts of ultraviolet absorber;
S2: the ultraviolet absorbent, the PP resin and the PET resin weighed in the step S1 are fully mixed and then added into the twin-screw extruder by adopting a fusion intercalation method, and then a switch of the twin-screw extruder is started to start extrusion molding of the mixture;
s3: stretching the product obtained in the step S2 to obtain a film with the thickness of 200-300 mu m;
S4: and (3) collecting and storing the film prepared in the step (S3), and ending the preparation flow of the whole ultraviolet photovoltaic resistant backboard PET composite film material.
In a preferred embodiment, the preparation method of the zinc-titanium hydrotalcite comprises the following steps: under vigorous stirring, the zinc compound, the titanium compound and the urea are dissolved into deionized water, and the obtained reactant is aged for 20-40 hours at the temperature of 80-150 ℃ to obtain the zinc-titanium hydrotalcite.
In a preferred embodiment, the zinc compound is any one of ZnCl 2、Zn(OH)2、Zn(NO3)2、ZnSO4、ZnCO3 or a hydrate thereof.
In a preferred embodiment, the zinc compound is Zn (NO 3)2·6H2 O).
In a preferred embodiment, the titanium compound is any one of TiCl 4、Ti(SO4)2 or a hydrate thereof.
In a preferred embodiment, the titanium compound is TiCl 4.
In a preferred embodiment, the molar ratio of zinc compound to titanium compound is (2-4): 1.
In a preferred embodiment, the molar ratio of zinc compound to titanium compound is 3:1.
In a preferred embodiment, in step S2, the processing temperature is between 150 and 250℃and the screw speed is between 100 and 400rmp and the residence time is between 5 and 10 minutes.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
In the invention, the film is prepared by mixing PET and hydrotalcite, the PET composite film material comprises PET resin and an ultraviolet absorber, and the ultraviolet absorber is hydrotalcite. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Drawings
FIG. 1 is an XRD pattern of the Zn-Ti hydrotalcite obtained in example 1 of the present invention;
FIG. 2 is a SEM schematic view of the Zn-Ti hydrotalcite obtained in example 1 of the present invention;
FIG. 3 is a UV-Vis schematic diagram of the Zn-Ti hydrotalcite obtained in example 1 of the present invention;
FIG. 4 is a schematic representation of the film color after aging for examples 2, 3,4 and comparative examples 1, 2 in the performance test of the present invention;
fig. 5 is a schematic diagram of the flow principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
With reference to figures 1-5 of the drawings,
Example 1
Firstly, preparing zinc-titanium hydrotalcite;
The zinc compound is Zn (NO 3)2·6H2 O), the titanium compound is TiCl 4, and the molar ratio of the zinc compound to the titanium compound is 3:1.
The method comprises the following specific steps: 0.44mL of LTiCl 4、2.38gZn(NO3)2·6H2 O and 6.0g of urea were dissolved in 200mL of deionized water with vigorous stirring. The resulting reaction was transferred to a hydrothermal reaction kettle and aged at 130 ℃ for 48h. Centrifuging the precipitate, thoroughly washing with water, and finally drying in an oven at 60 ℃ overnight to obtain the zinc-titanium hydrotalcite. According to the invention, hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Example 2
Preparation of a photovoltaic backboard composite PET film material with hydrotalcite as an ultraviolet absorber.
Uniformly mixing 84% of PET resin, 15% of PP resin and 1% of zinc-titanium hydrotalcite, and performing melt extrusion at 180 ℃ for 5 minutes by using a Lab-30 twin-screw extruder (Jiangsu Yue science and technology Co., ltd.) at a rotating speed of 200rpm to obtain a composite cast sheet. The cast sheet was stretched into a film using a static biaxial stretching machine (co-experimental analytical instruments, city, guangzhou) to obtain a photovoltaic backsheet film having a thickness of 240 μm. The preparation method of the zinc-titanium hydrotalcite comprises the following steps: under vigorous stirring, the zinc compound, the titanium compound and the urea are dissolved into deionized water, and the obtained reactant is aged for 20-40 hours at the temperature of 80-150 ℃ to obtain the zinc-titanium hydrotalcite. The zinc compound is any one of ZnCl2, zn (OH) 2, zn (NO 3) 2, znSO4 and ZnCO3 or a hydrate thereof. The titanium compound is any one of TiCl4 and Ti (SO 4) 2 or a hydrate thereof. In the invention, the film is prepared by mixing PET and hydrotalcite, the PET composite film material comprises PET resin and an ultraviolet absorber, and the ultraviolet absorber is hydrotalcite. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Example 3
Preparation of a photovoltaic backboard composite PET film material with hydrotalcite as an ultraviolet absorber.
Uniformly mixing 80% of PET resin, 15% of PP resin and 5% of zinc-titanium hydrotalcite, and performing melt extrusion at 180 ℃ for 5 minutes by using a Lab-30 twin-screw extruder (Jiangsu Yue science and technology Co., ltd.) at a rotating speed of 200rpm to obtain a composite cast sheet. The cast sheet was stretched into a film using a static biaxial stretching machine (co-experimental analytical instruments, city, guangzhou) to obtain a photovoltaic backsheet film having a thickness of 240 μm. The preparation method of the zinc-titanium hydrotalcite comprises the following steps: under vigorous stirring, the zinc compound, the titanium compound and the urea are dissolved into deionized water, and the obtained reactant is aged for 20-40 hours at the temperature of 80-150 ℃ to obtain the zinc-titanium hydrotalcite. The zinc compound is any one of ZnCl2, zn (OH) 2, zn (NO 3) 2, znSO4 and ZnCO3 or a hydrate thereof. The titanium compound is any one of TiCl4 and Ti (SO 4) 2 or a hydrate thereof. In the invention, the film is prepared by mixing PET and hydrotalcite, the PET composite film material comprises PET resin and an ultraviolet absorber, and the ultraviolet absorber is hydrotalcite. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Example 4
Preparation of a photovoltaic backboard composite PET film material with hydrotalcite as an ultraviolet absorber.
The PET resin with the mass fraction of 75%, the PP resin with the mass fraction of 15% and the zinc-titanium hydrotalcite with the mass fraction of 10% are uniformly mixed, and a Lab-30 twin-screw extruder (Jiangsu Yue science and technology Co., ltd.) is used for carrying out melt extrusion at 180 ℃ for 5 minutes at a rotating speed of 200rpm, so that a composite casting sheet is obtained. Stretching the cast sheet into a film by using a static biaxial stretching machine (Guangzhou city common experimental analysis instruments Co., ltd.) to obtain a photovoltaic back sheet film with the thickness of 240 μm,
The preparation method of the zinc-titanium hydrotalcite comprises the following steps: under vigorous stirring, the zinc compound, the titanium compound and the urea are dissolved into deionized water, and the obtained reactant is aged for 20-40 hours at the temperature of 80-150 ℃ to obtain the zinc-titanium hydrotalcite. The zinc compound is any one of ZnCl2, zn (OH) 2, zn (NO 3) 2, znSO4 and ZnCO3 or a hydrate thereof. The titanium compound is any one of TiCl4 and Ti (SO 4) 2 or a hydrate thereof. In the invention, the film is prepared by mixing PET and hydrotalcite, the PET composite film material comprises PET resin and an ultraviolet absorber, and the ultraviolet absorber is hydrotalcite. The hydrotalcite has a special layered structure and an anion object, can obviously improve the ultraviolet resistance and ageing resistance of the PET film, and simultaneously reduces the initial yellowness of the PET material. The composite film material can effectively absorb ultraviolet rays and has good heat insulation and ageing resistance. The hydrotalcite is embedded into the PET material, so that ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
Comparative example 1
The PET resin was fed into a Lab-30 twin screw extruder, and melt-extruded at 180℃for 5 minutes at a rotation speed of 200rpm to obtain a PET resin cast sheet. The cast sheet was stretched into a film using a static biaxial stretching machine to obtain a PET film having a thickness of 240. Mu.m.
Comparative example 2
PET resin (80%) and PP resin (20%) were fed into a Lab-30 twin-screw extruder, and melt-extruded at 180℃for 5 minutes at a rotation speed of 200rpm to obtain a PET-PP resin cast sheet. The cast sheet was stretched into a film using a static biaxial stretching machine to obtain a PET-PP film having a thickness of 240. Mu.m.
Performance testing
The aging property test was performed on example 2 of the present invention and comparative example. The solar back sheet films obtained in examples 2 to 4 and comparative examples 1 to 2 were subjected to an aging test in a constant temperature and humidity ultraviolet aging test chamber. The black mark temperature in the aging box is 50 ℃. The exposure cycle was performed using a UVA-351 lamp with an irradiance of 0.76 W.m-2.nm-1 at a wavelength of 340 nm. The cycle period is 6h, each time the lamp is lighted for 6h, the lamp is turned off for one hour, the next cycle is carried out, and the cycle times are 10 times. The test results are shown in Table 1.
TABLE 1
| Initial tensile Strength (Mpa) | Tensile Strength after aging (Mpa) | |
| Example 2 | 142 | 96 |
| Example 3 | 192 | 143 |
| Example 4 | 187 | 133 |
| Comparative example 1 | 121 | 47 |
| Comparative example 2 | 138 | 70 |
According to the experimental result, hydrotalcite is embedded into the PET material, ultraviolet rays can be effectively blocked, the service life of the PET material can be prolonged, and the yellowness of the PET material can be reduced. And simultaneously, the stability of the PET material can be improved. Therefore, the use of hydrotalcite as an ultraviolet absorber provides a feasible route for preparing the PET composite film material with high stability and long service life.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides an anti ultraviolet photovoltaic backplate PET complex film material which characterized in that: the ultraviolet photovoltaic resistant backboard PET composite film material comprises the following components: 700-990 parts of PET resin, 10-200 parts of PP resin and 10-100 parts of ultraviolet absorber;
the ultraviolet absorbent is zinc-titanium hydrotalcite;
the preparation method of the zinc-titanium hydrotalcite comprises the following steps: under the condition of intense stirring, dissolving a zinc compound, a titanium compound and urea into deionized water, and aging the obtained reactant at the temperature of 80-150 ℃ for 20-40 h to obtain zinc-titanium hydrotalcite;
The titanium compound is any one of TiCl 4、Ti(SO4)2 or a hydrate thereof;
The zinc compound is any one of ZnCl 2、Zn(OH)2、Zn(NO3)2、ZnSO4、ZnCO3 or a hydrate thereof;
The molar ratio of the zinc compound to the titanium compound is (2-4): 1.
2. The method for preparing the ultraviolet photovoltaic backboard resistant PET composite film material is characterized in that: the preparation method of the ultraviolet photovoltaic resistant backboard PET composite film material comprises the following steps:
s1: firstly, weighing raw materials for preparing the PET composite film material of the anti-ultraviolet photovoltaic backboard, and weighing: 700-990 parts of PET resin, 10-200 parts of PP resin and 10-100 parts of ultraviolet absorber;
S2: the ultraviolet absorbent, the PP resin and the PET resin weighed in the step S1 are fully mixed and then added into the twin-screw extruder by adopting a fusion intercalation method, and then a switch of the twin-screw extruder is started to start extrusion molding of the mixture;
s3: stretching the product obtained in the step S2 to obtain a film with the thickness of 200-300 mu m;
S4: and (3) collecting and storing the film prepared in the step (S3), and ending the preparation flow of the whole ultraviolet photovoltaic resistant backboard PET composite film material.
3. The method for preparing the ultraviolet photovoltaic backboard resistant PET composite film material is characterized in that: the zinc compound is Zn (NO 3)2·6H2 O).
4. The method for preparing the ultraviolet photovoltaic backboard resistant PET composite film material is characterized in that: the titanium compound is TiCl 4.
5. The method for preparing the ultraviolet photovoltaic backboard resistant PET composite film material is characterized in that: the molar ratio of the zinc compound to the titanium compound is 3:1.
6. The method for preparing the ultraviolet photovoltaic resistant backboard PET composite film material is characterized in that: in the step S2, the processing temperature is between 150 and 250 ℃, the screw speed is 100 to 400 rmp, and the residence time is 5 to 10 min.
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