Ultraviolet cut-off type anti-reflection packaging adhesive film and preparation method thereof

Abstract

The invention discloses an ultraviolet cut-off type anti-reflection packaging adhesive film and a preparation method thereof. The ultraviolet cut-off type anti-reflection packaging adhesive film is prepared from the following raw materials: macromolecular resin, a cross-linking agent, an assistant cross-linking agent, a silane coupling agent, an ultraviolet absorbent with the refractive index of 1.48 to 1.52 and a light stabilizer with the refractive index of 1.48 to 1.52. The ultraviolet absorbent with the refractive index of 1.48-1.52 and the light stabilizer with the refractive index of 1.48-1.52 are compounded, so that the light transmittance gt in the wave band of 320-380 nm can be realized; the light transmittance at the wave band of 300 to 320nm is 1t; compared with the prior art, the ultraviolet cut-off anti-reflection packaging adhesive film has the advantages that the ultraviolet cut-off anti-reflection packaging adhesive film has the advantages that the ultraviolet cut-off anti-reflection packaging adhesive film has the advantages that the ultraviolet cut-off anti-reflection packaging adhesive film is high in anti-reflection performance, light transmittance of visible-near-infrared 380-1100 nm can be increased, the overall power generation power of photovoltaic modules can be increased after the ultraviolet cut-off anti-reflection packaging adhesive film is applied to the photovoltaic modules, power attenuation caused by ultraviolet radiation can be reduced, the photovoltaic modules can be well protected

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic cells, and in particular relates to an ultraviolet cut-off anti-reflection packaging adhesive film and a preparation method thereof. Background Art

[0002] After the upgrade of photovoltaic cells from PERC (Passivated Emitter and Rear Cell) to TOPCon (Tunnel Oxide Passivated Contact) and HJT (Homojunction Solar Cell), the cells are becoming more and more sensitive to ultraviolet light. In order to protect the cells, it is necessary to cut off this part of ultraviolet light or convert it into light through a photoconversion film.

[0003] By means of UV cutoff, it is usually necessary to add benzophenone, UV531, UV234 and other UV absorbers, which can absorb and cut off the ultraviolet light in the 300-380nm band (the transmittance of the 300-380nm band is <20%), protecting the battery from being damaged by ultraviolet light. However, after the ultraviolet light is absorbed, the efficiency of the battery will be significantly reduced, because the ultraviolet light in the ultraviolet region of 330-380nm can generate electricity, and cutting off this part of light causes a decrease in power generation efficiency.

[0004] The way to convert light through light conversion film is usually to add a light conversion agent to the film to convert ultraviolet light in the 300-380nm band into blue light around 460nm. Light in the ultraviolet region can be used through light conversion, but light conversion has a certain conversion efficiency, and the light conversion agent is very expensive, which makes the cost of light conversion film 4-5 yuan / square meter higher than that of ordinary film. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a UV cut-off anti-reflection packaging film and a preparation method thereof.

[0006] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0007] A UV cut-off anti-reflection packaging adhesive film, wherein the raw materials for preparing the UV cut-off anti-reflection packaging adhesive film include a UV absorber with a refractive index of 1.48-1.52 and a light stabilizer with a refractive index of 1.48-1.52, and the UV cut-off anti-reflection packaging adhesive film has a transmittance of more than 50% in the 320-380nm band and a transmittance of less than 20% in the 300-320nm band.

[0008] Furthermore, the ultraviolet absorber is at least one of isooctyl salicylate and homosalate.

[0009] Preferably, the ultraviolet absorber is a compound of isooctyl salicylate and homosalate, and the addition ratio of the homosalate is 10%-80%.

[0010] More preferably, the addition ratio of homosalate is 30%-60%.

[0011] Furthermore, the light stabilizer is at least one of the light stabilizer 770 and the light stabilizer 292 .

[0012] Furthermore, the raw materials for preparing the UV cut-off anti-reflection encapsulation film also include a polymer resin, a cross-linking agent, a co-cross-linking agent and a silane coupling agent, and the weight proportions of each raw material are respectively: 95-99.68 parts of polymer resin, 0.1-1 parts of cross-linking agent, 0.1-1 parts of co-cross-linking agent, 0.1-1 parts of silane coupling agent, 0.1-1 parts of light stabilizer, and 0.01-2 parts of UV absorber.

[0013] Furthermore, the polymer resin is at least one of ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, and ethylene-methyl methacrylate copolymer.

[0014] Further, the crosslinking agent is an organic peroxide crosslinking agent, and the organic peroxide crosslinking agent is at least one of diisopropylbenzene peroxide, tert-butyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-amyl peroxy-2-ethylhexyl carbonate, di(2-ethyl)hexyl peroxydicarbonate, tert-amyl peroxy-2-ethylhexyl carbonate, benzoyl peroxide, and tert-butyl peroxy-2-ethylhexanoate.

[0015] Furthermore, the auxiliary cross-linking agent is at least one of triallyl isocyanurate, 3-(trimethoxysilyl)propyl methacrylate, 3-vinylphenol, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and glycerol trihydroxypropyl ether triacrylate.

[0016] Furthermore, the silane coupling agent is at least one selected from γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltri(β-methoxyethoxy)silane, γ-(methacryloxy)propyltrimethoxysilane, and silane-grafted POE.

[0017] Furthermore, the raw materials for preparing the UV cut-off anti-reflection encapsulation film also include an antioxidant and an acid scavenger, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, and antioxidant 168, and the acid scavenger is at least one of magnesium hydroxide, zinc oxide, aluminum hydroxide, calcium carbonate, and hydrotalcite.

[0018] The present invention also discloses a method for preparing a UV cut-off anti-reflection packaging film, comprising the following steps:

[0019] By weight, 95-99.68 parts of polymer resin, 0.1-1 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-1 parts of silane coupling agent, 0.1-1 parts of light stabilizer, and 0.01-2 parts of ultraviolet absorber are added to a stirring kettle for mixing and stirring, kept at 35-45°C for 2-10 hours, and then put into a film extruder for cast extrusion to obtain the desired ultraviolet cut-off anti-reflection packaging film. The ultraviolet cut-off anti-reflection packaging film can be a single-layer structure or a multi-layer structure, comprising at least one polymer resin described in claim 5, and the multi-layer structure is extruded by a multi-layer extruder.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The invention discloses an ultraviolet cut-off anti-reflection packaging adhesive film and a preparation method thereof. The raw materials for preparing the ultraviolet cut-off anti-reflection packaging adhesive film include a polymer resin, a cross-linking agent, an auxiliary cross-linking agent, a silane coupling agent, an ultraviolet absorber with a refractive index of 1.48-1.52 and a light stabilizer with a refractive index of 1.48-1.52. The transmittance of the ultraviolet cut-off anti-reflection packaging adhesive film in a 320-380nm band is greater than 50%, and the transmittance in a 300-320nm band is less than 20%. The invention compounded an ultraviolet absorber with a refractive index of 1.48-1.52 and a light stabilizer with a refractive index of 1.48-1.52, so as to achieve a light transmittance of more than 50% in the 320-380nm band and a light transmittance of less than 20% in the 300-320nm band, and at the same time improve the light transmittance in the visible-near infrared 380-1100nm. After the ultraviolet cut-off anti-reflection packaging film is applied to the photovoltaic module, the overall power generation power of the photovoltaic module can be improved, the power attenuation caused by ultraviolet radiation can be reduced, and the protection effect on photovoltaic protection is better, and the service life is extended. DETAILED DESCRIPTION

[0022] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0023] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0024] The invention discloses an ultraviolet cut-off anti-reflection packaging adhesive film, wherein the raw materials for preparing the film include a polymer resin, a cross-linking agent, an auxiliary cross-linking agent, a silane coupling agent, an ultraviolet absorber with a refractive index of 1.48-1.52, and a light stabilizer with a refractive index of 1.48-1.52, wherein the weight portions of the raw materials for preparing the film are respectively: 95-99.68 parts of the polymer resin, 0.1-1 parts of the cross-linking agent, 0.1-1 parts of the auxiliary cross-linking agent, 0.1-1 parts of the silane coupling agent, 0.1-1 parts of the light stabilizer, and 0.01-2 parts of the ultraviolet absorber. The transmittance of the ultraviolet cut-off anti-reflection packaging adhesive film in the 320-380nm band is greater than 50%, and the transmittance in the 300-320nm band is less than 20%.

[0025] The 320-380nm band is the ultraviolet light in the UVA band. Although the energy is weaker, the battery will respond to 330-380nm. The ultraviolet light in the 330-380nm band can generate electricity, so it should not be cut off.

[0026] This is because the 300-320nm band is the UVB band of ultraviolet light, which has stronger energy and destructive power, so it must be cut off.

[0027] The ultraviolet absorber is at least one of isooctyl salicylate and homosalate.

[0028] The light stabilizer is at least one of light stabilizer 770 (preferably having a refractive index of 1.498) and light stabilizer 292 (preferably having a refractive index of 1.4810-1.4850). The refractive index of light stabilizer 770 is preferably 1.498, and the refractive index of light stabilizer 292 is preferably 1.4810-1.4850.

[0029] The polymer resin is at least one of ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-octene copolymer and ethylene-methyl methacrylate copolymer.

[0030] The crosslinking agent is an organic peroxide crosslinking agent, and the organic peroxide crosslinking agent is at least one of diisopropylbenzene peroxide (DCP), tert-butyl peroxy-2-ethylhexyl carbonate (TBEC), 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-amyl peroxy-2-ethylhexyl carbonate (TAEC), di(2-ethyl)hexyl peroxydicarbonate, tert-amyl peroxy-2-ethylhexyl carbonate, benzoyl peroxide, and tert-butyl peroxy-2-ethylhexanoate.

[0031] The auxiliary cross-linking agent is at least one of triallyl isocyanurate (TAIC), 3-(trimethoxysilyl)propyl methacrylate, 3-vinylphenol, triallyl cyanurate (TAC), trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), and glycerol trihydroxypropyl ether triacrylate (GPTA).

[0032] The silane coupling agent is at least one of γ-methacryloxypropyltrimethoxysilane (KH570), vinyltrimethoxysilane (A-171), vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane and vinyltri(β-methoxyethoxy)silane, γ-(methacryloxy)propyltrimethoxysilane, and silane-grafted POE.

[0033] Antioxidants and acid scavengers may or may not be added to the raw materials for preparing the UV cutoff anti-reflection encapsulation film according to actual needs. The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, and antioxidant 168. The acid scavenger is at least one of magnesium hydroxide, zinc oxide, aluminum hydroxide, calcium carbonate, hydrotalcite, and magnesium oxide.

[0034] The present invention also discloses a method for preparing a UV cut-off anti-reflection packaging film, comprising the following steps:

[0035] By weight, 95-99.68 parts of polymer resin, 0.1-1 part of cross-linking agent, 0.1-1 part of auxiliary cross-linking agent, 0.1-1 part of silane coupling agent, 0.1-1 part of light stabilizer and 0.01-2 parts of ultraviolet absorber are added into a stirring kettle and mixed and stirred. The mixture is kept warm at 35-45°C for 2-10 hours and then put into a film extruder for cast extrusion to obtain the desired ultraviolet cut-off anti-reflection packaging film.

[0036] In some embodiments, the UV cut-off anti-reflection encapsulation film may be a single-layer EVA or POE film, or a multi-layer film including the two.

[0037] Example 1

[0038] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0039] Weigh 98.2 parts of ethylene-vinyl acetate copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.1 parts of light stabilizer 292 with a refractive index of 1.481, and 0.1 parts of isooctyl salicylate with a refractive index of 1.50, in parts by weight;

[0040] 0.3 parts of crosslinking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary crosslinking agent triallyl isocyanurate, 0.2 parts of auxiliary crosslinking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.1 parts of light stabilizer 292, and 0.1 parts of ultraviolet absorber isooctyl salicylate were added to 98.2 parts of ethylene-vinyl acetate copolymer resin, mixed and stirred in a conical stirring kettle for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a film with a gram weight of 380g / m 2 UV cut-off anti-reflection encapsulation film.

[0041] Example 2

[0042] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0043] Weigh 98.1 parts of ethylene-vinyl acetate copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of cross-linking agent tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, and 0.3 parts of ultraviolet absorber isooctyl salicylate by weight;

[0044] 0.3 parts of crosslinking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of crosslinking agent tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary crosslinking agent triallyl isocyanurate, 0.2 parts of auxiliary crosslinking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.3 parts of ultraviolet absorber isooctyl salicylate were added to 98.1 parts of ethylene-vinyl acetate copolymer resin, mixed and stirred in a conical stirring kettle for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a film with a gram weight of 380g / m 2 UV cut-off anti-reflection encapsulation film.

[0045] The rest is the same as in Example 1.

[0046] Example 3

[0047] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0048] Weigh 98.1 parts of ethylene-vinyl acetate copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, and 0.3 parts of ultraviolet absorber homosalate by weight;

[0049] 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, and 0.3 parts of ultraviolet absorber homosalate are added to 98.1 parts of ethylene-vinyl acetate copolymer resin, mixed and stirred in a conical stirring kettle for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a film with a gram weight of 380g / m 2 UV cut-off anti-reflection encapsulation film.

[0050] The rest is the same as in Example 1.

[0051] Example 4

[0052] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0053] Weigh 98.1 parts of ethylene-vinyl acetate copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.21 parts of ultraviolet absorber isooctyl salicylate, and 0.09 parts of ultraviolet absorber homosalate by weight;

[0054] 0.3 parts of crosslinking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary crosslinking agent triallyl isocyanurate, 0.2 parts of auxiliary crosslinking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.21 parts of ultraviolet absorber isooctyl salicylate, 0.09 parts of ultraviolet absorber homosalate were added to 98.1 parts of ethylene-vinyl acetate copolymer resin, mixed and stirred in a conical stirring kettle for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a film with a gram weight of 380g / m 2 UV cut-off anti-reflection encapsulation film.

[0055] The rest is the same as in Example 1.

[0056] Example 5

[0057] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0058] Weigh 98.1 parts of ethylene-vinyl acetate copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.12 parts of ultraviolet absorber isooctyl salicylate, and 0.18 parts of ultraviolet absorber homosalate by weight;

[0059] 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.12 parts of UV absorber isooctyl salicylate, and 0.18 parts of UV absorber homosalate are added to 98.1 parts of ethylene-vinyl acetate copolymer resin, mixed and stirred in a conical stirring tank for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a UV cut-off anti-reflection packaging film with a gram weight of 380 g / m2.

[0060] The rest is the same as in Example 1.

[0061] Example 6

[0062] A method for preparing a UV cut-off anti-reflection packaging film comprises the following steps:

[0063] Weigh 98.1 parts of ethylene-octene copolymer resin, 0.3 parts of cross-linking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary cross-linking agent triallyl isocyanurate, 0.2 parts of auxiliary cross-linking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.12 parts of ultraviolet absorber isooctyl salicylate, and 0.18 parts of ultraviolet absorber homosalate by weight;

[0064] 0.3 parts of crosslinking agent tert-butyl peroxide-2-ethylhexyl carbonate, 0.3 parts of tert-amyl peroxide 2-ethylhexyl carbonate, 0.5 parts of auxiliary crosslinking agent triallyl isocyanurate, 0.2 parts of auxiliary crosslinking agent trimethylolpropane trimethacrylate, 0.3 parts of silane coupling agent KH570, 0.3 parts of light stabilizer 292, 0.12 parts of ultraviolet absorber isooctyl salicylate, and 0.18 parts of ultraviolet absorber homosalate are added to 98.1 parts of ethylene-octene copolymer resin, mixed and stirred in a conical stirring kettle for 30 minutes, kept warm at 40°C for 2 hours, and then put into a film extruder for cast extrusion to obtain a film with a gram weight of 380 g / m 2 UV cut-off anti-reflection encapsulation film.

[0065] The rest is the same as in Example 1.

[0066] Comparative Example 1

[0067] The difference between this comparative example and Example 2 is that the raw materials for preparing the UV cut-off anti-reflection packaging film in this comparative example do not contain 0.3 parts of the UV absorber isooctyl salicylate.

[0068] The rest is the same as Example 2.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 2 is that the raw materials for preparing the UV cut-off anti-reflection packaging film in this comparative example do not contain 0.3 parts of light stabilizer 292.

[0071] The rest is the same as Example 2.

[0072] Comparative Example 3

[0073] A certain brand of UV cut-off film is available on the market, the UV absorber is UV531, and the refractive index is 1.60.

[0074] The transmittance, module power, UV60kWh / m 2 Power attenuation test after UV irradiation.

[0075] The light transmittance is tested by laminating the film onto photovoltaic glass according to IEC62788-1-2.

[0076] The module power comparison test is to replace the packaging film in the embodiment and the comparative example with the battery, version and glass unchanged. The battery is a TOPCon battery. The module power after packaging is tested and the UV irradiation is 60kWh / m 2 The power attenuation is shown in the HJT and BC battery tests, and the examples are not listed one by one.

[0077] The test results are shown in Table 1.

[0078] Table 1

[0079]

[0080]

[0081] From the data in Table 1, we can see that:

[0082] Embodiments 1-6 can achieve a lower transmittance in the UVB band 300-320nm with stronger destructive power in the ultraviolet band, and a higher transmittance in the UVA band 320-380nm that the battery responds to. At the same time, the transmittance of the film in the visible-near infrared 380-1100nm is relatively high, greater than 90%.

[0083] Comparing Example 2 with Comparative Examples 1-2, Example 2 can achieve a lower transmittance (3.76%) in the UVB band 300-320nm with strong destructive power in the ultraviolet band, a higher transmittance (69.86%) in the UVA band 320-380nm of the battery response, a transmittance of 91.59% in the visible-near infrared 380-1100nm, a component power of 560.48W, and a power attenuation of 1.57% after ultraviolet irradiation. However, Comparative Example 1 does not use the ultraviolet absorber isooctyl salicylate, and the transmittance of Comparative Example 1 in the UVB band 300-320nm and UVA band 320-380nm with strong destructive power in the ultraviolet band is greater than 50%, and the transmittance in the visible-near infrared 380-1100nm is 90.46%, which is lower than Example 2, and the component power is 556.23W, which is lower than Example 2, and the power attenuation after ultraviolet irradiation is large, reaching 4.48%. Comparative Example 2 does not use a light stabilizer, and the transmittance in the visible-near infrared 380-1100nm is 90.53%, which is lower than Example 2, and the component power is 555.32W, which is lower than Example 2. This shows that only by adding the ultraviolet absorber and the light stabilizer at the same time can the lower transmittance of the UVB band 300-320nm with strong destructive power in the ultraviolet band and the higher transmittance of the UVA band 320-380nm that the battery responds to be achieved, and the transmittance of the visible-near infrared 380-1100nm can be improved and the power attenuation caused by ultraviolet radiation can be reduced. If only the ultraviolet absorber or the light stabilizer is added, the above effects cannot be achieved, and the ultraviolet absorber and the light stabilizer need to be used in coordination.

[0084] Example 4-6 is compared with Example 1-3. Example 4-6, which is a compound of homosalate and isooctyl salicylate, is irradiated with ultraviolet light at 60 kWh / m 2 The yellowing △YI of the film is significantly smaller than that of Examples 1-2 in which isothinyl salicylate is added alone and that of Example 3 in which isothinyl salicylate is added alone. This indicates that the combination of the two can reduce the yellowing after ultraviolet irradiation to a certain extent. In the yellowing requirements of the material, the yellowing △YI<3 is generally difficult to distinguish with the naked eye, so the general technical requirement is △YI<3. In Example 1 in which no ultraviolet absorber is added and Example 2 in which no light stabilizer is added, it can be seen that △YI is greater than 3. This indicates that the synergy between the ultraviolet absorber and the light stabilizer can reduce the yellowing after UV aging, and the two ultraviolet absorbers in this patent can further reduce the yellowing after UV aging and improve the weather resistance under a certain ratio.

[0085] Comparative Example 3 is a commercially available cut-off type adhesive film, the refractive index of the UV absorber is >1.52, and the light transmittance at 300-320nm and 320-380nm is very low, especially the light at 320-380nm is blocked, resulting in the component power being only 553.75W. The initial power is small, but the power attenuation is small after UV irradiation. This is because the UV light is blocked, protecting the battery. Comparing Examples 1-6 with Comparative Example 3, the different refractive indices of the ultraviolet absorbers will have a significant impact on the transmittance in the bands of 300-320nm and the UVA band of 320-380nm, indicating that only by using the ultraviolet absorber with a refractive index of 1.48-1.52 disclosed in the present invention can the lower transmittance in the UVB band 300-320nm with stronger destructive power in the ultraviolet band, the higher transmittance in the UVA band 320-380nm of battery response, and the higher transmittance in the visible-near infrared 380-1100nm be achieved.

[0086] In summary, it can be seen that only by adding the ultraviolet absorber and light stabilizer with a refractive index of 1.48-1.52 disclosed in the present invention at the same time and compounding the other preparation raw materials of the present invention can the ultraviolet cut-off anti-reflection packaging film be obtained, and the UVB band with strong destructive power of the ultraviolet band 300-320nm has a smaller transmittance, the UVA band 320-380nm of the battery response has a higher transmittance, and the visible-near infrared 380-1100nm transmittance and lower power attenuation are achieved.

[0087] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0088] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A UV cut-off anti-reflection packaging film, characterized in that: The raw materials for preparing the UV cut-off anti-reflection packaging film include a UV absorber with a refractive index of 1.48-1.52 and a light stabilizer with a refractive index of 1.48-1.

52. The UV cut-off anti-reflection packaging film has a transmittance of more than 50% in the 320-380nm band and a transmittance of less than 20% in the 300-320nm band.

2. The UV-cutoff anti-reflection packaging film according to claim 1, characterized in that: The ultraviolet absorber is at least one of isooctyl salicylate and homosalate.

3. The UV-cutoff anti-reflection packaging film according to claim 1, characterized in that: The light stabilizer is at least one of the light stabilizer 770 and the light stabilizer 292 .

4. A UV cut-off anti-reflection packaging film according to any one of claims 1 to 3, characterized in that: The raw materials for preparing the UV cut-off anti-reflection packaging film also include a polymer resin, a cross-linking agent, a co-cross-linking agent and a silane coupling agent, and the weight proportions of each raw material are: 95-99.68 parts of polymer resin, 0.1-1 parts of cross-linking agent, 0.1-1 parts of co-cross-linking agent, 0.1-1 parts of silane coupling agent, 0.1-1 parts of light stabilizer, and 0.01-2 parts of UV absorber.

5. The UV-cutoff anti-reflection packaging film according to claim 4, characterized in that: The polymer resin is at least one of ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, and ethylene-methyl methacrylate copolymer.

6. The UV-cutoff anti-reflection packaging film according to claim 4, characterized in that: The crosslinking agent is an organic peroxide crosslinking agent, and the organic peroxide crosslinking agent is at least one of diisopropylbenzene peroxide, tert-butyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-amyl peroxy-2-ethylhexyl carbonate, di(2-ethyl)hexyl peroxydicarbonate, tert-amyl peroxy-2-ethylhexyl carbonate, benzoyl peroxide, and tert-butyl peroxy-2-ethylhexanoate.

7. The UV-cutoff anti-reflection packaging film according to claim 4, characterized in that: The auxiliary cross-linking agent is at least one of triallyl isocyanurate, 3-(trimethoxysilyl)propyl methacrylate, 3-vinylphenol, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, glycerol trihydroxypropyl ether triacrylate, and ethoxylated trimethylolpropane triacrylate.

8. The UV-cutoff anti-reflection packaging film according to claim 4, characterized in that: The silane coupling agent is at least one selected from γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltri(β-methoxyethoxy)silane, γ-(methacryloxy)propyltrimethoxysilane, and silane-grafted POE.

9. The UV-cutoff anti-reflection packaging film according to claim 4, characterized in that: The raw materials for preparing the UV cut-off anti-reflection packaging film also include an antioxidant and an acid scavenger, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, and antioxidant 168, and the acid scavenger is at least one of magnesium hydroxide, zinc oxide, aluminum hydroxide, calcium carbonate, hydrotalcite, and magnesium oxide.

10. The method for preparing a UV cut-off anti-reflection packaging film according to any one of claims 1 to 9, characterized in that: The following steps are involved: By weight, 95-99.68 parts of polymer resin, 0.1-1 parts of crosslinking agent, 0.1-1 parts of auxiliary crosslinking agent, 0.1-1 parts of silane coupling agent, 0.1-1 parts of light stabilizer, and 0.01-2 parts of ultraviolet absorber are added to a stirring kettle for mixing and stirring, kept at 35-45°C for 2-10 hours, and then put into a film extruder for cast extrusion to obtain the desired ultraviolet cut-off anti-reflection packaging film. The ultraviolet cut-off anti-reflection packaging film can be a single-layer structure or a multi-layer structure, comprising at least one polymer resin described in claim 5, and the multi-layer structure is extruded by a multi-layer extruder.

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