Packaging adhesive film and preparation method and application thereof

Abstract

The invention provides a packaging adhesive film as well as a preparation method and application thereof. The packaging adhesive film comprises a first adhesive film layer, a second adhesive film layer and a third adhesive film layer which are sequentially stacked, wherein the first adhesive film layer is a PVB (Polyvinyl Butyral) layer, the second adhesive film layer is a POE (Polyolefin Elastomer) layer, and the third adhesive film layer is a tackifying layer; and at least one of the first adhesive film layer, the second adhesive film layer and the third adhesive film layer contains an ultraviolet absorbent. The packaging adhesive film with the structure can effectively solve the problems of poor color uniformity and poor stability of the packaging adhesive film caused by mismatching of materials of the barrier layer and the problem of corrosion of a plasticizer in the packaging adhesive film to an intelligent middle layer in the prior art, and is beneficial to comprehensively improving the comprehensive performance of laminated glass.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging films, and in particular to a packaging film, a preparation method thereof, and applications thereof. Background Art

[0002] With the increasing global emphasis on low-carbon and environmentally friendly concepts and the rapid development of the new energy vehicle industry, market demand for high-performance, environmentally friendly packaging materials has shown significant growth. Gray PVB (polyvinyl butyral) film, a material with low light transmittance, low haze, and excellent UV and infrared blocking properties, has been widely used in skylights, windows, and curtain walls in the automotive and architectural fields due to its excellent privacy protection and thermal insulation properties in laminated glass. However, current gray PVB film has exposed a series of technical issues when used in the intelligent intermediate layer packaging of new energy vehicles, limiting its further promotion in the high-end market.

[0003] Traditional gray PVB films contain high levels of plasticizers, typically no less than 20%. While the addition of plasticizers can improve PVB's flexibility and processing properties, these chemicals can severely corrode intelligent interlayers such as dimming films and display films. Prolonged contact not only damages the structural integrity of the interlayer but also causes its functionality to gradually fail, significantly impacting the performance and lifespan of laminated glass.

[0004] In order to overcome the corrosion problem of plasticizers, the existing technology attempts to introduce a barrier layer between PVB and the intelligent intermediate layer, such as using EVA (ethylene-vinyl acetate copolymer) material. Although this solves the corrosion problem to a certain extent, the EVA material will release acidic small molecules after aging, which not only affects the stability of the gray pigment, but also causes the color of the film to change during use, affecting the appearance. In addition, after the multi-layer structure encapsulation film is laminated, it may also cause interlayer crosstalk and interlayer wrinkling, affecting the color uniformity of the laminated glass. Especially in the high-pressure and high-temperature lamination process, the incompatibility of the interlayer materials may cause different shades of color, affecting the visual effect and overall quality of the laminated glass.

[0005] Therefore, while existing multi-layer encapsulant films address the issue of plasticizer corrosion, in practice, due to interlayer material compatibility and stability issues, significant room for improvement remains in color uniformity and long-term stability. The challenge is to overcome the existing issues of plasticizer corrosion in the intelligent interlayer, as well as the poor color uniformity and stability of the encapsulant film caused by mismatched barrier layer materials, thereby improving the overall performance of laminated glass and meeting the urgent demand for high-end laminated glass products in the new energy vehicle and architectural sectors. Summary of the Invention

[0006] The main purpose of the present invention is to provide an encapsulating film and its preparation method and application, so as to solve the problems of poor color uniformity and poor stability of the encapsulating film caused by mismatch of barrier layer materials in the prior art, as well as the problem of corrosion of the intelligent intermediate layer by the plasticizer in the encapsulating film. The purpose is to comprehensively improve the comprehensive performance of laminated glass to meet the urgent demand for high-end laminated glass products in the new energy vehicle and construction fields.

[0007] The present application provides an encapsulation film, which includes a first film layer, a second film layer and a third film layer stacked in sequence; wherein the first film layer is a PVB layer, the second film layer is a POE layer, and the third film layer is an adhesion-promoting layer; and at least one of the first film layer, the second film layer and the third film layer contains an ultraviolet absorber.

[0008] Furthermore, the ML value of the POE layer at 130°C is not less than 0.20 dN·m; preferably, the ML value of the POE layer at 130°C is 0.25 to 0.70 dN·m; preferably, the thickness of the POE layer is 50 to 600 μm; preferably, the UV absorber is selected from 2-cyano-3,3-diphenyl acrylate, ethylhexyl p-methoxycinnamate, isooctyl p-methoxycinnamate, dimethyl 4-methoxybenzylidenemalonate, N-(2-ethoxyphenyl)- One or more of N'-(4-ethylphenyl)-oxalamide, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'tert-butyl-5'-methylphenyl)-5-chloro-benzotriazole, 2-(4,6-, 3,5-di-tert-butyl-4-hydroxybenzoic acid hexadecyl ester, 2-(4,6-diphenyl-1,3,5-triazine-2)-5-n-hexaneoxyphenol and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0009] Furthermore, the raw material components of the POE layer include a first POE resin, a first cross-linking agent, a first co-cross-linking agent and an optional ultraviolet absorber; preferably, in parts by weight, the raw material components of the POE layer include 40 to 100 parts of the first POE resin, 0.1 to 2 parts of the first cross-linking agent, and 0.2 to 2 parts of the first co-cross-linking agent; preferably, the number average molecular weight of the first POE resin is 10,000 to 100,000; preferably, the first cross-linking agent is an organic peroxide; more preferably, the first cross-linking agent is selected from tert-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-(di-tert-butylperoxycarbonate), tert-butylperoxyisopropyl carbonate, tert-butylperoxycarbonate ... tert-Butylperoxy)hexane, tert-Butylperoxycarbonate-2-ethylhexyl ester, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-dimethyl-2,5-bis(benzoylperoxy)-hexane, tert-amyl peroxycarbonate, and tert-butyl peroxy-3,3,5-trimethylhexanoate One or more of; preferably, the first auxiliary crosslinking agent is selected from allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane tetraacrylate, ditrimethylolpropane At least one of tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclopentane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate and polyethylene glycol dimethacrylate; preferably, in the raw material components of the POE layer, the weight content of the ultraviolet absorber is 0.05 to 2.0%.

[0010] Furthermore, the raw material components of the POE layer also include a first silane coupling agent; preferably, in parts by weight, the first silane coupling agent is 0.1 to 2 parts in the raw material components of the POE layer; preferably, the first silane coupling agent is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltris(β-methoxyethoxy)silane, γ-aminopropyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethylsilane and 3-aminopropyltrimethylsilane.

[0011] Furthermore, the raw material components of the POE layer further include a silane-modified POE resin and a catalyst; preferably, in parts by weight, the silane-modified POE resin is 5 to 60 parts of the raw material components of the POE layer; preferably, the silane-modified POE resin is selected from at least one of a silane-grafted ethylene and propylene copolymer, a silane-grafted ethylene and butene copolymer, a silane-grafted ethylene and pentene copolymer, a silane-grafted ethylene and hexene copolymer, or a silane-grafted ethylene and octene copolymer; Preferably, the number average molecular weight of the silane-modified POE resin is 10,000 to 100,000; preferably, the weight ratio of the silane-modified POE resin to the catalyst is (500 to 150,000):1; preferably, the catalyst is selected from dimethylbenzylamine, 1,4-dimethylpiperazine, 1,8-diazabicyclo[5,4,0]undec-7-ene, dibutyltin dilaurate, stannous octoate, dioctyltin dithiol, dibutyltin oxide, dibutyltin diacetate, di(decene) dialkylsulfide) dibutyltin, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, triethylenediamine, N'N'N'N-tetramethylalkylenediamine, N'N'N'N-pentamethyldiethylenetriamine, triethylamine, N'N-dimethylbenzylamine, N'N-dimethylhexadecylamine, N'N-dimethylbutylamine, triethylenediamine, N-ethylmorpholine, N-methylmorpholine, N'N-diethylpiperazine, N'N-diethyl-2-methylpiperazine, N'N- At least one of bis-(α-hydroxypropyl)-2-methylpiperazine, N-2-hydroxypropyldimethylmorpholine, triethanolamine, N'N-dimethylethanolamine, pyridine, N'N-lutidine, potassium carboxylate, 2,4,6-tris(dimethylaminomethyl)phenol, trimethyl-N-2-hydroxypropylhexanoic acid, 1,3,5-tris(dimethylaminopropyl)-hexahydrotriazine, naphthalenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, dibutyltin laurate maleate, organic bismuth, organic lead and organic mercury.

[0012] Furthermore, the raw material components of the POE layer also include a photoinitiator crosslinking agent; preferably, by weight, the raw material components of the POE layer include 0.1 to 2.0 parts of the photoinitiator crosslinking agent; preferably, the photoinitiator crosslinking agent is an ultraviolet light-initiator crosslinking agent; preferably, the ultraviolet light-initiator crosslinking agent is selected from benzophenone, 4-chlorobenzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, isopropylthioxanthone, benzoin dimethyl ether, ethyl 4-(N,N-dimethylamino)benzoate, methyl o-benzoylbenzoate, 2-hydroxybenzoylbenzoate, benzophenone ... -2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and at least one of methyl benzoylformate.

[0013] Furthermore, the raw material components of the PVB layer include: PVB resin, pigment and optional ultraviolet absorber; preferably, in the raw materials of the PVB layer, the weight content of PVB resin is 90-99.9%, and the weight content of pigment is 0.1-10%; preferably, the number average molecular weight of the PVB resin is 40,000-200,000; preferably, the thickness of the PVB layer is 20-100 μm; preferably, in the raw material components of the PVB layer, the weight content of ultraviolet absorber is 0.05-2.0%; preferably, in the raw material components of the PVB layer, the weight content of water is 0.2%-2%.

[0014] Furthermore, the raw material components of the adhesion layer include: a base resin, a second cross-linking agent, a second auxiliary cross-linking agent, a second silane coupling agent, and an optional ultraviolet absorber; preferably, in parts by weight, the raw material components of the adhesion layer include: 100 parts of the base resin, 0.1-2 parts of the second cross-linking agent, 0.1-2 parts of the second auxiliary cross-linking agent, and 0.1-1.5 parts; preferably, the base resin is EVA resin and / or the second POE resin; preferably, the thickness of the adhesion layer is 100-600 μm; preferably, the ML value of the adhesion layer is less than or equal to the ML value of the POE layer; preferably, the number average molecular weight of the EVA resin is 10,000-100,000; preferably, the number average molecular weight of the second POE resin is 10,000-100,000; preferably, the second cross-linking agent is an organic peroxide; more preferably, the second cross-linking agent is selected from tert-butyl peroxy isopropyl carbonate, 2,5-dimethyl-2,5-(bis-tert-butylperoxy)hexane, tert-butyl peroxy carbonate-2-ethylhexyl ester, 1,1-bis(tert-butylperoxy)-3,3,5 -trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, tert-amyl peroxy 2-ethylhexyl carbonate, 2,5-dimethyl 2,5-dimethyl 2,5-dimethyl 2,5-bis(benzoylperoxy)-hexane, tert-amyl peroxy carbonate and tert-butyl peroxy 3,3,5-trimethylhexanoate; preferably, the second auxiliary crosslinking agent is selected from allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate , tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane tetraacrylate, ditrimethylolpropane tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclopentane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2 -ethyl-1,3-propylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; preferably, the second silane coupling agent is selected from at least one of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tert-butyl triperoxide silane, vinyl triacetoxysilane, vinyl tris(β-methoxyethoxy) silane, γ-aminopropyl triethoxysilane, γ-methacryloyloxypropyl trimethoxysilane, γ-glycidoxypropyl trimethylsilane, and 3-aminopropyl trimethylsilane; preferably, the weight content of the ultraviolet absorber in the raw material components of the adhesion-promoting layer is 0.05 to 2.0%.

[0015] According to a second aspect of the present invention, a method for preparing the above-mentioned encapsulation film is also provided, which comprises the following steps: coating a PVB layer on the surface of a release substrate; providing a POE layer on the surface of the PVB layer away from the release substrate; and providing an adhesion-promoting layer on the surface of the POE layer away from the release substrate, thereby obtaining the encapsulation film.

[0016] Furthermore, when the raw material group of the POE layer includes a silane-modified POE resin and a catalyst, the preparation method includes the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry; applying the mixed slurry to the surface of the release substrate, and drying to form the PVB layer; on the side surface of the PVB layer away from the release substrate, forming the POE layer and the adhesion layer in sequence by a first multi-layer co-extrusion method; or, on the side surface of the PVB layer away from the release substrate, forming the POE layer by a first lamination method, and then forming the adhesion layer on the side surface of the POE layer away from the PVB layer. The POE layer is formed into an adhesion-promoting layer to obtain an encapsulating film; or, when the raw material components of the POE layer only contain the first cross-linking agent, and do not contain the silane-modified POE resin, the catalyst, and the photoinitiator cross-linking agent, the preparation method comprises the following steps: mixing the raw material of the PVB layer with the first solvent to obtain a mixed slurry, applying the mixed slurry on the surface of the release substrate, and drying to form a PVB layer; on the side surface of the PVB layer away from the release substrate, forming the POE layer and the adhesion-promoting layer in sequence by a second multi-layer co-extrusion method; or, on the side surface of the PVB layer away from the release substrate, forming the POE layer and the adhesion-promoting layer in sequence by a second multi-layer co-extrusion method; The second laminating method first forms a POE layer, and then forms an adhesion-promoting layer on the side of the POE layer away from the PVB to obtain a pre-encapsulated adhesive film; the PVB layer side of the pre-encapsulated adhesive film is subjected to electron irradiation to obtain an encapsulated adhesive film; or, when the raw material group of the POE layer includes a photoinitiator cross-linking agent, the preparation method includes the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry; coating the mixed slurry on the surface of the release substrate, and drying to form a PVB layer; on the surface of the PVB layer away from the release substrate, a third multi-layer co-extrusion method is used. A POE layer and a tackifying layer are formed in sequence; alternatively, a POE layer is first formed on the surface of the PVB layer away from the release substrate by a third lamination method, and then a tackifying layer is formed on the side of the POE layer away from the PVB to obtain a pre-packaging film; the PVB layer side of the pre-packaging film is subjected to ultraviolet irradiation to obtain an encapsulating film; preferably, during the electron irradiation process, the energy of the electrons is 0.1 to 0.4 eV, and the irradiation intensity is 15 to 50 kGy; preferably, during the ultraviolet irradiation process, the irradiation intensity is 0.01 to 0.10 kWh / m 2 ; Preferably, the drying temperature is 50-100°C and the time is 5-60 min; Preferably, the first solvent is a compound of ethanol and xylene; More preferably, the volume ratio of ethanol and xylene is (0.2-5):1; Preferably, in the mixed slurry, the weight content of the first solvent is 60-90%.

[0017] According to a third aspect of the present invention, there is further provided a laminated glass, which comprises the above-mentioned encapsulating adhesive film; or, the laminated glass comprises the encapsulating adhesive film prepared by the above-mentioned preparation method.

[0018] The present invention provides an encapsulating film comprising a first film layer, a second film layer, and a third film layer stacked in sequence; wherein the first film layer is a PVB layer, the second film layer is a POE layer, and the third film layer is an adhesion-promoting layer; and at least one of the first, second, and third film layers contains a UV absorber. This encapsulating film structure effectively addresses the issues of poor color uniformity and stability caused by mismatched barrier layer materials, as well as the corrosion of the intelligent intermediate layer caused by plasticizers in the prior art encapsulating film, thereby comprehensively improving the overall performance of laminated glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic diagram of sample testing positions during the color uniformity testing process of the present invention is shown. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] As described in the background technology section, the traditional PVB film has a high plasticizer content, which will have a serious corrosive effect on intelligent intermediate layers such as dimming films and display films. In the prior art, attempts have been made to overcome the corrosion problem of plasticizers by introducing a barrier layer between PVB and the intelligent intermediate layer, such as using EVA (ethylene-vinyl acetate copolymer) material. However, the EVA material will release acidic small molecules after aging, which will affect the stability of the gray pigment. In addition, after the multi-layer structure encapsulation film is laminated, it may also cause interlayer cross-linking and interlayer wrinkling, affecting the color uniformity and stability of the laminated glass. Especially in the high-pressure and high-temperature lamination process, the mutual flow of the interlayer material interface may cause different shades of color, affecting the visual effect and overall quality of the laminated glass.

[0023] In order to solve the above problems, the present invention provides a packaging film, which includes a first film layer, a second film layer, and a third film layer stacked in sequence; wherein the first film layer is a PVB layer, the second film layer is a POE layer, and the third film layer is an adhesion-enhancing layer; and at least one of the first film layer, the second film layer, and the third film layer contains an ultraviolet absorber. The packaging film with the above structure can effectively solve the problems of poor color uniformity and poor stability of the packaging film caused by mismatching barrier layer materials in the prior art, as well as the problem of corrosion of the intelligent intermediate layer by the plasticizer in the packaging film, thereby comprehensively improving the comprehensive performance of laminated glass. Analysis of the reasons for the above excellent results may include the following aspects:

[0024] First, as mentioned above, in order to increase the flexibility of the PVB encapsulation film, it is often achieved by adding plasticizers (such as triethylene glycol diethyl ether) to the PVB film. However, the presence of plasticizers in the PVB film also brings the risk of corrosion to the intelligent intermediate layer, greatly limiting the use scenario of the film. In the encapsulation film provided by the present application, a POE layer is also provided between the PVB layer and the tackifying layer, which can effectively block the plasticizer and other components in the PVB layer. This is because POE (polyolefin elastomer), as a thermoplastic elastomer that does not contain plasticizers, has the advantages of stable performance, good mechanical properties and weather resistance. Its chemical composition will not migrate and diffuse at high temperatures or for a long time like the plasticizers and other components in PVB, affecting the adjacent film layers. It can then effectively block the diffusion of components such as plasticizers in the PVB layer and prevent corrosion of the intelligent intermediate layer equipment.

[0025] Secondly, the POE layer placed between the PVB layer and the adhesion layer can further block corrosive components in the adhesion layer (such as acidic small molecules released by EVA material after aging). As mentioned above, POE has the advantages of stable performance and excellent mechanical and weather resistance. The stability advantages of this intermediate layer also prevent the components of the adhesion layer from affecting those of the PVB layer, further improving the stability of the encapsulation film.

[0026] Third, the presence of an adhesion-promoting layer in the encapsulating film further enhances its adhesion and maintains its color uniformity and interlayer stability, ensuring better adhesion between layers. Even during high-pressure, high-temperature lamination, interlayer crosstalk and wrinkling are less likely to occur. Furthermore, the addition of a UV absorber to at least one layer of the film effectively absorbs UV rays, preventing them from penetrating the film's interior. This, in particular, prevents direct UV exposure to gray pigments, protecting them from UV degradation and ensuring the film's color stability over long-term use.

[0027] In summary, the introduction of a POE layer into the encapsulation film proposed in this application fundamentally avoids the risks of using plasticizers in PVB films, eliminates corrosion to the intelligent interlayer, and ensures the functional stability and durability of the intelligent interlayer. Through the interaction between the aforementioned structures, the aforementioned three-layered encapsulation film effectively addresses the prior art issues of poor color uniformity and stability of the encapsulation film due to mismatched barrier layer materials, as well as the issue of corrosion of the intelligent interlayer by plasticizers in the encapsulation film, thereby comprehensively improving the overall performance of laminated glass.

[0028] In a preferred embodiment, the ML value of the POE layer at 130°C is no less than 0.20 dN·m. As described above, the introduction of the encapsulating film can improve the corrosion resistance of corrosive substances in the PVB layer to the intelligent intermediate layer material, as well as the corrosion resistance of corrosive substances in the adhesion layer to the components of the PVB layer. Controlling the fluidity of the POE layer within the above range can achieve better adhesion and stability between the three laminated film layers, effectively preventing interlayer crosstalk and wrinkling that may occur after lamination of the multilayer encapsulating film, and further improving the color uniformity of the encapsulating film. Preferably, the ML value of the POE layer at 130°C is 0.25 to 0.7 dN·m; specifically, 0.25 dN·m, 0.30 dN·m, 0.35 dN·m, 0.40 dN·m, 0.45 dN·m, 0.55 dN·m, 0.60 dN·m, 0.65 dN·m, 0.70 dN·m, or any ML value between any two of the above. Controlling the fluidity of the POE layer within the above preferred range will achieve better results. Preferably, the thickness of the POE layer is 50 to 600 μm, specifically, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, or any thickness between any two of the above. When the thickness of the POE layer is within the above range, the blocking effect of the POE layer can be better exerted, and at the same time, the adhesion between the various film layers of the encapsulation film can be better, which is conducive to further improving the performance of the encapsulation film. Preferably, the UV absorber is selected from one or more of ethyl 2-cyano-3,3-diphenylacrylate, ethylhexyl p-methoxycinnamate, isooctyl p-methoxycinnamate, dimethyl 4-methoxybenzylidenemalonate, N-(2-ethoxyphenyl)-N'-(4-ethylphenyl)-oxalamide, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'tert-butyl-5'-methylphenyl)-5-chloro-benzotriazole, 2-(4,6-, 3,5-di-tert-butyl-4-hydroxybenzoate, 2-(4,6-diphenyl-1,3,5-triazine-2)-5-n-hexaneoxyphenol, and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole. The use of the above-mentioned UV absorbers can further improve the comprehensive performance of the encapsulation film.

[0029] Regarding the fluidity of the POE layer, this application defines it by its "ML value." Specifically, the testing method for this parameter includes taking 3.0-3.5g of the corresponding film, cutting it into approximately 3cm x 3cm square pieces, stacking them, and sandwiching them between two 25μm thick release PET sheets. The test is performed in a rotorless vulcanizer at a temperature of 130°C, a test time of 5 minutes, and a swing angle of 0.5°.

[0030] In a preferred embodiment, the raw material components of the POE layer include a first POE resin, a first cross-linking agent, a first co-cross-linking agent, and an optional ultraviolet absorber. The POE resin in the raw material components of the POE layer is the basic material of the POE layer, and its high elasticity, good weather resistance and corrosion resistance are one of the key components for constructing the POE layer. Through its molecular structure and chemical properties, the POE resin provides physical protection and stability for the encapsulation film, avoiding the corrosion of the intelligent intermediate layer by the plasticizer in the traditional PVB film. The first cross-linking agent and the first co-cross-linking agent act synergistically to form an additional cross-linked chemical bond structure between the polymer molecular chains through chemical reaction, thereby further increasing the cross-linking density of the POE layer, which is conducive to better improving the thermal stability, mechanical strength and chemical resistance of the POE layer. Under the synergistic effect of the above-mentioned components, the molecular network formed by the POE layer is made tighter, more stable and durable, and at the same time, the POE layer can have better adhesion with the PVB layer and the tackifying layer.

[0031] Preferably, the raw material components of the POE layer include 40-100 parts of the first POE resin, 0.1-2 parts of the first crosslinking agent, and 0.2-2 parts of the first co-crosslinking agent, by weight. Controlling the ratios of the various components in the raw material components of the POE layer within the above ranges can better leverage the synergistic effects between the components, better control the fluidity of the formed POE layer, and further improve the stability and corrosion resistance of the encapsulating film. Preferably, the first cross-linking agent is an organic peroxide; more preferably, the first cross-linking agent is selected from one or more of tert-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-(bis-tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-dimethyl-2,5-bis(benzoylperoxy)-hexane, tert-amyl peroxycarbonate and tert-butyl peroxy-3,3,5-trimethylhexanoate. The presence of the first cross-linking agent in the raw material components of the POE layer can enable the POE layer to be formed better. The organic peroxide as a cross-linking agent can decompose to generate active free radicals. These free radicals can react with the polymer chains in the POE resin to form a cross-linked structure, further enhancing the creep resistance, aging resistance and environmental resistance of the POE layer. Preferably, the number average molecular weight of the first POE resin is 10,000 to 100,000; the comprehensive performance of the POE layer formed using the POE resin with the above number average molecular weight is better. Preferably, the first POE resin is selected from at least one of ethylene and propylene copolymers, ethylene and butene copolymers, ethylene and pentene copolymers, ethylene and hexene copolymers or ethylene and octene copolymers. Selecting the above-mentioned type of POE resin can further improve the comprehensive performance of the formed POE layer.

[0032] Preferably, the first auxiliary crosslinking agent is allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane At least one of tetraacrylate, ditrimethylolpropane tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclodecane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate. Using the above-mentioned co-crosslinking agent as a raw material for the POE layer can better synergize with the first crosslinking agent, thereby improving the performance of the resulting encapsulating film. Preferably, the weight content of the ultraviolet absorber in the raw material components of the POE layer is 0.05-2.0%. Controlling the weight content of the ultraviolet absorber in the raw material components of the POE layer within the above range can effectively achieve the absorption of ultraviolet rays by the encapsulating film, further improving the color stability of the encapsulating film during long-term use.

[0033] In a preferred embodiment, the raw material components of the POE layer also include a first silane coupling agent. Adding a coupling agent to the raw material components of the POE layer is beneficial to further improve the interfacial compatibility between the various raw materials in the POE layer, give full play to the performance of each component, and thus help to further improve the mechanical properties, water resistance and aging resistance of the formed POE layer. Preferably, by weight, the first silane coupling agent is 0.1 to 2 parts in the raw material components of the POE layer. The above effect is better when the proportion of the first silane coupling agent in the raw material components of the POE layer is controlled within the above range. Preferably, the first silane coupling agent is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltris(β-methoxyethoxy)silane, γ-aminopropyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidyloxypropyltrimethylsilane and 3-aminopropyltrimethylsilane. Using the above-mentioned type of first silane coupling agent, the performance of the obtained encapsulating film is better.

[0034] In a preferred embodiment, the raw material components of the POE layer also include silane-modified POE resin and a catalyst. The PVB resin in the PVB layer adjacent to the POE layer in the encapsulation film of the present application is a material that easily absorbs water. Under the catalytic action of the catalyst, the trace amount of water absorbed by the PVB resin will react with the silane-modified POE resin to form a cross-linking reaction. The occurrence of the above-mentioned cross-linking reaction can reduce the fluidity of the POE layer, further improve the laminated appearance of the POE layer, thereby enabling the three-layer laminated composite film layer to have not only uniform color and smooth interlayers, but also better bonding strength. Preferably, by weight, in the raw material components of the POE layer, the silane-modified POE resin is 5 to 60 parts; preferably, the weight ratio of the silane-modified POE resin and the catalyst is (500 to 150,000): 1; controlling the raw material components of the POE layer, the addition ratio of the silane-modified POE resin and the catalyst is within the above range, so that the cross-linking reaction can be better carried out, which is conducive to further improving the performance of the encapsulation film prepared. Preferably, the silane-modified POE resin is selected from at least one of a silane-grafted ethylene-propylene copolymer, a silane-grafted ethylene-butene copolymer, a silane-grafted ethylene-pentene copolymer, a silane-grafted ethylene-hexene copolymer, or a silane-grafted ethylene-octene copolymer. Preferably, the number average molecular weight of the silane-modified POE resin is 10,000 to 100,000. Using these types of silane-modified POE resins and controlling their number average molecular weight within this range can further improve the performance of the encapsulating film.

[0035] Preferably, the catalyst is selected from dimethylbenzylamine, 1,4-dimethylpiperazine, 1,8-diazabicyclo[5,4,0]undec-7-ene, dibutyltin dilaurate, stannous octoate, dioctyltin dithiol, dibutyltin oxide, dibutyltin diacetate, di(dodecylsulfide)dibutyltin, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, triethylenediamine, N'N'N'N-tetramethylalkylenediamine, N'N'N'N-pentamethyldiethylenetriamine, triethylamine, N'N-dimethylbenzylamine, N'N-dimethylhexadecylamine, N'N-dimethylbutylamine, triethylenediamine, N-ethylmorpholine, N-methyl At least one of morpholine, N'N-diethylpiperazine, N'N-diethyl-2-methylpiperazine, N'N-bis-(α-hydroxypropyl)-2-methylpiperazine, N-2-hydroxypropyldimethylmorpholine, triethanolamine, N'N-dimethylethanolamine, pyridine, N'N-lutidine, potassium carboxylate, 2,4,6-tris(dimethylaminomethyl)phenol, trimethyl-N-2-hydroxypropyl hexanoic acid, 1,3,5-tris(dimethylaminopropyl)-hexahydrotriazine, naphthalenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, dibutyltin laurate maleate, organic bismuth (such as bismuth neodecanoate), organic lead (such as lead 2-ethylhexanoate), and organic mercury (such as mercuric 2-ethylhexanoate). The catalyst can cooperate with components such as the silane-modified POE resin to promote a better cross-linking reaction in the POE layer, thereby further improving the fluidity of the POE layer and enhancing the overall performance of the encapsulation film.

[0036] In a preferred embodiment, the raw material components of the POE layer also include a photoinitiator crosslinking agent; the photoinitiator crosslinking agent can trigger a crosslinking reaction in the POE layer under the condition of the presence of external radiation light, thereby reducing the fluidity of the POE layer and further improving the laminated appearance. Preferably, in parts by weight, the photoinitiator crosslinking agent is 0.1 to 2.0 parts in the raw material components of the POE layer; controlling the addition ratio of the photoinitiator crosslinking agent within the above range can further promote the photoinitiated reaction of the POE layer, which is beneficial to further improve the stability and durability of the encapsulation film. Preferably, the photoinitiator crosslinking agent is an ultraviolet light-initiated crosslinking agent; preferably, the ultraviolet light-initiated crosslinking agent is selected from benzophenone, 4-chlorobenzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, isopropylthioxanthone, benzoin dimethyl ether, ethyl 4-(N,N-dimethylamino)benzoate, methyl o-benzoylbenzoate, 2-hydroxy-2-methyl-1-phenylacetone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-2- At least one of (4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, and methyl benzoylformate.

[0037] In a preferred embodiment, the raw materials for the PVB layer include: PVB resin, pigment, and an optional UV absorber. PVB resin is the base material of the PVB layer, primarily providing the film's adhesiveness and transparency. The pigment added to the PVB layer can be used to adjust the film's color to meet specific visual requirements. The pigment can be selected from gray pigments (such as cerium oxide, titanium oxide, indium tin oxide, cesium tungsten bronze, and tungsten oxide), green pigments (such as chromium oxide green, cobalt green, emerald green, earth green, phenol cyanine green, naphthol green, and cadmium green), red pigments (such as chrome red, iron oxide red, vermilion, and rose madder crimson), yellow pigments (such as lemon yellow, barium chromate, cadmium yellow, cobalt yellow, and Naples yellow), and blue pigments (such as indigo, ultramarine blue, cobalt blue, and phthalocyanine blue) to meet specific needs. Preferably, the weight content of the PVB resin in the raw materials of the PVB layer is 90-99.9%, and the weight content of the pigment is 0.1-10%. Preferably, the number average molecular weight of the PVB resin is 40,000-200,000. Preferably, the thickness of the PVB layer is 20-100 μm, specifically, for example, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or any thickness in between. Preferably, the weight content of the UV absorber in the raw materials of the PVB layer is 0.05-2.0%. These preferred parameters in the raw materials of the PVB layer can improve the performance of the encapsulating film.

[0038] Preferably, the weight content of water in the raw material components of the PVB layer is 0.2% to 2%. As mentioned above, the PVB resin in the PVB layer adjacent to the POE layer in the encapsulation film of the present application is a material that easily absorbs water. Under the catalytic action of the catalyst, the trace amount of water absorbed by the PVB resin will undergo a cross-linking reaction with the silane-modified POE resin to reduce the fluidity of the POE layer and improve the laminated appearance of the POE layer, so that the three-layer laminated composite film layers are not only uniform in color and smooth between layers, but also have better bonding strength. Controlling the water content of the PVB layer within the above range can make the above cross-linking reaction proceed better. It should be further explained here that the water content of the raw materials of the PVB layer is obtained by Karl Fischer method.

[0039] In a preferred embodiment, the raw material components of the adhesion layer include: a base resin, a second cross-linking agent, a second auxiliary cross-linking agent, a second silane coupling agent, and an optional ultraviolet absorber. Under the synergistic effect of the second cross-linking agent, the second auxiliary cross-linking agent, and the second silane coupling agent, the cross-linking reaction of the base resin can be promoted, the interlayer interface adhesion can be improved, and the interlayer peeling can be reduced, which is conducive to further improving the overall bonding performance and durability of the encapsulation film. Preferably, in parts by weight, the raw material components of the adhesion layer include 100 parts of the base resin, 0.1 to 2 parts of the second cross-linking agent, 0.1 to 2 parts of the second auxiliary cross-linking agent, and 0.1 to 1.5 parts of the second silane coupling agent; controlling the ratio of each component in the raw material components of the adhesion layer within the above range can further improve the adhesion and durability of the adhesion layer. Preferably, the base resin is EVA resin and / or the second POE resin; selecting EVA resin or the second POE resin as the base resin in the adhesion layer can achieve good results. When the EVA resin and the second POE resin are compounded and used, they can be mixed in any proportion. Preferably, the number average molecular weight of the EVA resin is 10,000 to 100,000; preferably, the number average molecular weight of the second POE resin is 10,000 to 100,000. Using EVA resin or second POE resin with the above molecular weight can make the formed adhesion layer more effective, which is conducive to further improving the effect of the encapsulation film.

[0040] Preferably, the thickness of the adhesion layer is 100 to 600 μm, specifically, for example, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, or any thickness between any two of the above; controlling the thickness of the adhesion layer within the above range can make the use effect of the encapsulation film better. Preferably, the ML value of the adhesion layer is less than or equal to the ML value of the POE layer. The encapsulation film in the present application includes a first film layer PVB layer, a second film layer POE layer and a third film layer adhesion layer stacked in sequence; controlling the fluidity parameters of the POE layer and the adhesion layer in the encapsulation film within the above range can avoid the phenomenon of unclear interlayer clarity and interlayer crosstalk caused by excessive fluidity of the adhesion layer during the lamination process, so that the interlayer stability of the encapsulation film during the lamination process is better, which is conducive to further avoiding interlayer crosstalk and wrinkles, and further improving the stability of the encapsulation film.Preferably, the second crosslinking agent is an organic peroxide; more preferably, the second crosslinking agent is selected from tert-butyl peroxy isopropyl carbonate, 2,5-dimethyl-2,5-(bis-tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, 2-ethylhexyl carbonate peroxide, At least one of tert-amyl peroxide, 2,5-dimethyl 2,5-dimethyl 2,5-dimethyl 2,5-bis(benzoyl peroxy)-hexane, tert-amyl peroxycarbonate and tert-butyl peroxy 3,3,5-trimethylhexanoate; preferably, the second auxiliary crosslinking agent is selected from allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl) isocyanuric acid triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, Ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane tetraacrylate, ditrimethylolpropane tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclopentane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2-ethyl-1,3 - At least one of propylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; preferably, the second silane coupling agent is selected from at least one of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl triperoxide tert-butyl silane, vinyl triacetoxysilane, vinyl tris(β-methoxyethoxy) silane, γ-aminopropyl triethoxysilane, γ-methacryloyloxypropyl trimethoxysilane, γ-glycidyloxypropyl trimethylsilane, and 3-aminopropyl trimethylsilane. The use of the above-mentioned specific second crosslinking agent, second co-crosslinking agent, and second silane coupling agent can further improve the comprehensive performance of the encapsulating film. Preferably, the weight content of the ultraviolet absorber in the raw material components of the adhesion layer is 0.05-2.0%. Controlling the weight content of the ultraviolet absorber in the raw material components of the adhesion layer within the above range can further improve the durability of the encapsulating film.

[0041] According to a second aspect of the present invention, a method for preparing the aforementioned encapsulating film is also provided. The method comprises the following steps: coating a PVB layer on a release substrate; disposing a POE layer on the side of the PVB layer facing away from the release substrate; and disposing an adhesion-promoting layer on the side of the POE layer facing away from the release substrate, thereby obtaining the encapsulating film. The above method is simple to operate and can improve the performance of the resulting encapsulating film.

[0042] In a preferred embodiment, when the raw material group of the POE layer includes a silane-modified POE resin and a catalyst, the preparation method comprises the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry; coating the mixed slurry on the surface of the release substrate, and drying to form the PVB layer; on the side surface of the PVB layer away from the release substrate, a POE layer and a tackifying layer are sequentially formed by a first multi-layer co-extrusion method; or, on the side surface of the PVB layer away from the release substrate, a POE layer is first formed by a first lamination method, and then a tackifying layer is formed on the side of the POE layer away from the PVB to obtain an encapsulating film; or, when the raw material components of the POE layer only contain a first cross-linking agent and do not contain a silane-modified POE resin, a catalyst, and a photoinitiator cross-linking agent, the preparation method comprises the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry, coating the mixed slurry on the surface of the release substrate, and drying to form the PVB layer; on the side surface of the PVB layer away from the release substrate, a second A POE layer and a tackifying layer are formed in sequence by a multi-layer co-extrusion method; alternatively, a POE layer is first formed on a surface of the PVB layer away from the release substrate by a second lamination method, and then a tackifying layer is formed on a side of the POE layer away from the PVB to obtain a pre-packaged adhesive film; one side of the PVB layer of the pre-packaged adhesive film is subjected to an electron irradiation operation to obtain an encapsulation adhesive film; or, when the raw material group of the POE layer includes a photoinitiator cross-linking agent, the preparation method includes the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry; coating the mixed slurry on the surface of the release substrate, and drying to form the PVB layer; on the surface of the PVB layer away from the release substrate, a POE layer and a tackifying layer are formed in sequence by a third multi-layer co-extrusion method; alternatively, a POE layer is first formed on a surface of the PVB layer away from the release substrate by a third lamination method, and then a tackifying layer is formed on a side of the POE layer away from the PVB to obtain a pre-packaged adhesive film; one side of the PVB layer of the pre-packaged adhesive film is subjected to an ultraviolet irradiation operation to obtain an encapsulation adhesive film.

[0043] In the above preparation method, the raw materials of the PVB layer are first mixed with a first solvent and then coated on the surface of the release substrate, and then dried to form a PVB layer; then a pre-encapsulated film is obtained by multi-layer co-extrusion or lamination. Finally, according to the different raw materials that play a cross-linking role in the POE layer, a corresponding method is selected to promote the cross-linking reaction, reduce the fluidity of the POE layer, and improve the color and appearance uniformity of the encapsulated film, so that the prepared encapsulated film has better performance. Specifically, when the POE layer includes a silane-modified POE resin and a catalyst, the catalyst can synergize with the silane-modified POE resin and other raw material components in the POE layer without applying additional conditions to complete the cross-linking reaction. When the raw material components of the POE layer only contain a first cross-linking agent, and do not contain a silane-modified POE resin, a catalyst, and a photoinitiator cross-linking agent, the organic peroxide in the first cross-linking agent can undergo further cross-linking reaction under conditions of electron irradiation. When the POE layer contains a photoinitiator cross-linking agent, the photoinitiator cross-linking agent can synergize with other raw material components in the POE layer under conditions of ultraviolet light initiation to complete the cross-linking reaction. The above method can make the performance of the prepared encapsulated film better. The encapsulation films prepared by the above preparation methods all have good effects. Preferably, during the electron irradiation process, the energy of the electrons is 0.1 to 0.4 eV and the irradiation intensity is 15 to 50 kGy; preferably, during the ultraviolet irradiation process, the irradiation intensity is 0.01 to 0.10 kWh / m 2 . Controlling the parameters of the electron irradiation process and the light irradiation process under the above conditions can improve the performance of the prepared encapsulation film. Preferably, the drying temperature is 50-100°C and the drying time is 5-60 minutes; preferably, the first solvent is a mixture of ethanol and xylene; more preferably, the volume ratio of ethanol to xylene is (0.2-5):1; preferably, the weight content of the first solvent in the mixed slurry is 60-90%. Preparation according to the above parameters can improve the performance of the formed encapsulation film.

[0044] According to a third aspect of the present invention, there is further provided a laminated glass, which comprises the above-mentioned encapsulating adhesive film; or, the laminated glass comprises the encapsulating adhesive film prepared by the above-mentioned preparation method.

[0045] The present application is further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0046] It should be further explained that the moisture content of the PVB layer raw materials was determined using the Karl Fischer method. The silane-modified POE resin with a number-average molecular weight of 38,000 is a silane-grafted ethylene and propylene copolymer with a number-average molecular weight of 38,000; the silane-modified POE resin with a number-average molecular weight of 12,000 is a silane-grafted ethylene and propylene copolymer with a number-average molecular weight of 12,000.

[0047] Example 1

[0048] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0049]

[0050] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent, and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain an encapsulation film.

[0051] Example 2

[0052] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0053]

[0054] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst and the silane-modified POE resin are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 300 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent, the second silane coupling agent and the ultraviolet absorber are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 30 μm to obtain an encapsulation film.

[0055] Example 3

[0056] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0057]

[0058] The above-mentioned PVB resin, gray pigment, ultraviolet absorber and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst and the silane-modified POE resin are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 300 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 30 μm to obtain an encapsulation film.

[0059] Example 4

[0060] The difference between Example 4 and Example 1 is the process of preparing the encapsulating film. Specifically,

[0061] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 20 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and applied to the PVB layer by laminating to form a POE layer with a thickness of 600 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent, and the second silane coupling agent are mixed by weight and applied to the POE layer by laminating to form a tackifying layer with a thickness of 140 μm to obtain an encapsulation film.

[0062] Example 5

[0063] The difference between Example 5 and Example 1 is the process of preparing the encapsulating film. Specifically,

[0064] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 100 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and applied to the PVB layer by laminating to form a POE layer with a thickness of 100 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent, and the second silane coupling agent are mixed by weight and applied to the POE layer by laminating to form a tackifying layer with a thickness of 20 μm to obtain an encapsulating film.

[0065] Example 6

[0066] The difference between Example 6 and Example 1 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0067]

[0068]

[0069] Example 7

[0070] The difference between Example 7 and Example 1 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulation film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulation film are shown in the following table:

[0071]

[0072]

[0073] Example 8

[0074] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0075]

[0076]

[0077] The PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, the first silane coupling agent and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain a pre-encapsulation film; one side of the PVB layer of the pre-encapsulation film is subjected to electron irradiation to obtain an encapsulation film. During the electron irradiation process, the energy of the electrons is 0.4 eV and the irradiation intensity is 50 kGy.

[0078] Example 9

[0079] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0080]

[0081]

[0082] The PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, the first silane coupling agent and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain a pre-encapsulation film; one side of the PVB layer of the pre-encapsulation film is subjected to electron irradiation to obtain an encapsulation film. During the electron irradiation process, the energy of the electrons is 0.1 eV and the irradiation intensity is 15 kGy.

[0083] Example 10

[0084] The difference between Example 10 and Example 8 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0085]

[0086]

[0087] Example 11

[0088] The difference between Example 11 and Example 8 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0089]

[0090] Example 12

[0091] The difference between Example 12 and Example 8 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0092]

[0093] Example 13

[0094] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0095]

[0096]

[0097] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, and the photoinitiator cross-linking agent are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent, the second silane coupling agent and the ultraviolet absorber are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain a pre-encapsulation film; one side of the PVB layer of the pre-encapsulation film is subjected to ultraviolet irradiation to obtain an encapsulation film. Among them, during the ultraviolet irradiation process, the irradiation intensity is 0.01kWh / m 2 .

[0098] Example 14

[0099] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0100]

[0101]

[0102] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first auxiliary cross-linking agent, and the photoinitiator cross-linking agent are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 300 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second auxiliary cross-linking agent, the second silane coupling agent and the ultraviolet absorber are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 30 μm to obtain a pre-encapsulation film; one side of the PVB layer of the pre-encapsulation film is subjected to ultraviolet irradiation to obtain an encapsulation film. Among them, during the ultraviolet irradiation process, the irradiation intensity is 0.1kWh / m 2 .

[0103] Example 15

[0104] The difference between Example 15 and Example 13 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0105]

[0106]

[0107] Example 16

[0108] The difference between Example 16 and Example 13 is that the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are different. Specifically, the raw materials and the addition ratios of the various adhesive layers in the encapsulating adhesive film are shown in the following table:

[0109]

[0110]

[0111] Example 17

[0112] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0113]

[0114]

[0115] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent, and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain an encapsulation film.

[0116] Example 18

[0117] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0118]

[0119]

[0120] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second cross-linking agent, the second co-cross-linking agent, and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain an encapsulation film.

[0121] Example 19

[0122] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0123]

[0124]

[0125] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and attached to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 400 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent, and the second silane coupling agent are mixed by weight and attached to the POE layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 330 μm to obtain an encapsulation film.

[0126] Comparative Example 1

[0127] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0128]

[0129] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the first POE resin, the first cross-linking agent, the first co-cross-linking agent, the catalyst, the silane-modified POE resin, and the ultraviolet absorber are mixed by weight and adhered to the PVB layer by multi-layer co-extrusion to form a POE layer with a thickness of 300 μm; and an encapsulation film is obtained.

[0130] Comparative Example 2

[0131] The raw materials and addition ratios of each adhesive layer in the encapsulation film are shown in the following table:

[0132]

[0133] The above-mentioned PVB resin, gray pigment and water are mixed with a first organic solvent by weight to obtain a mixed slurry (wherein, the first organic solvent is ethanol and xylene mixed in a volume ratio of 1:1, and the solvent accounts for 80% of the total weight of the slurry); the obtained mixed slurry is coated on the surface of the release substrate PET, and dried at 65°C for 30 minutes to form a PVB layer with a thickness of 30 μm; the EVA resin, the second POE resin, the second cross-linking agent, the second co-cross-linking agent, the second silane coupling agent and the ultraviolet absorber are mixed by weight and adhered to the PVB layer by multi-layer co-extrusion to form a tackifying layer with a thickness of 30 μm to obtain an encapsulation film.

[0134] The encapsulating films in the above examples and comparative examples were tested for relevant properties, with the results shown in Table 1. The specific testing method for determining the ML value of the corresponding film layer is as follows: 3.0-3.5g of the corresponding film was cut into approximately 3cm x 3cm square pieces. The pieces were stacked and sandwiched between two 25μm thick release PET sheets. The pieces were then placed in a rotorless vulcanizer for testing to obtain the ML value of the corresponding film layer. The test temperature was 130°C, the test time was 5 minutes, and the swing angle was 0.5°.

[0135] In order to test the color uniformity of the encapsulation films prepared in the above examples and comparative examples, a 30×30 cm film was taken and stacked in the order of glass, film, and glass. The film was placed in a laminator and laminated at 130°C for 45 minutes. After lamination, the film was taken out of the laminator and cooled to room temperature. Figure 1The position diagram shown in the figure was used for lab testing. Nine points were tested on each piece of glass, and the mean square deviation of E was calculated. This parameter can reflect the uniformity of the color distribution of the encapsulating film. When the mean square deviation of E calculated in the corresponding embodiment or comparative example is smaller, it means that the color distribution of the encapsulating film in the corresponding embodiment or comparative example is more uniform.

[0136] Color stability test of the encapsulating film: The glass laminate was placed in an aging chamber at 85°C, 85% RH for 1000 hours. The laminate was then subjected to a Lab test. The Lab values before and after aging were compared, and the dE value was calculated. This parameter reflects the color stability of the encapsulating film; a lower dE value indicates better color stability.

[0137] Adhesion test of encapsulation film: The test method of the adhesion between encapsulation film and glass refers to the standard GB / T29848 "Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation".

[0138] Table 1

[0139]

[0140]

[0141] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0142] Examples 1 to 19 illustrate the encapsulating films of the present invention. These films comprise a first PVB layer, a second POE layer, and a third adhesion-promoting layer, stacked in sequence. At least one of the first, second, and third layers contains a UV absorber. Table 1 shows that the encapsulating films with this structure exhibit not only high color uniformity but also excellent color stability and adhesion. In particular, controlling the parameters of the encapsulating films within optimal ranges can enhance the performance of the encapsulating films.

[0143] The encapsulation film in Comparative Example 1 contained only a first PVB layer and a second POE layer. While the color stability of the corresponding encapsulation film was acceptable, its adhesion was significantly lower than that of the encapsulation film in the present embodiment. The encapsulation film in Comparative Example 2 contained only a first PVB layer and a second tackifying layer. While the adhesion was improved, its color stability was poor, making it difficult to maintain a uniform and stable color over an extended period. Furthermore, encapsulation films with these two structures cannot avoid the risks of using plasticizers in PVB films, making it difficult to eliminate corrosion of functionalized interface layers (such as the intelligent interlayer).

[0144] In summary, the encapsulation film with the above-mentioned structure provided in the present application can effectively solve the problem of corrosion of the intelligent intermediate layer by the plasticizer in the encapsulation film in the prior art, as well as the problem of poor color uniformity and poor stability of the encapsulation film due to mismatch of the barrier layer material, thereby comprehensively improving the comprehensive performance of laminated glass.

[0145] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A packaging film, characterized in that: The encapsulation film includes a first film layer, a second film layer and a third film layer stacked in sequence; wherein the first film layer is a PVB layer, the second film layer is a POE layer, and the third film layer is an adhesion-promoting layer; and at least one of the first film layer, the second film layer and the third film layer contains an ultraviolet absorber.

2. The packaging film according to claim 1, wherein The ML value of the POE layer at 130° C. is not less than 0.20 dN·m; Preferably, the ML value of the POE layer at 130° C. is 0.25 to 0.70 dN·m; Preferably, the thickness of the POE layer is 50 to 600 μm; Preferably, the ultraviolet absorber is selected from one or more of 2-cyano-3,3-diphenyl ethyl acrylate, ethylhexyl p-methoxycinnamate, isooctyl p-methoxycinnamate, dimethyl 4-methoxybenzylidenemalonate, N-(2-ethoxyphenyl)-N'-(4-ethylphenyl)-oxalamide, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'tert-butyl-5'-methylphenyl)-5-chloro-benzotriazole, 2-(4,6-, 3,5-di-tert-butyl-4-hydroxybenzoic acid hexadecyl ester, 2-(4,6-diphenyl-1,3,5-triazine-2)-5-n-hexaneoxyphenol and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

3. The encapsulating film according to claim 1 or 2, characterized in that: The raw material components of the POE layer include a first POE resin, a first cross-linking agent, a first auxiliary cross-linking agent and the optional ultraviolet absorber; Preferably, in the raw material components of the POE layer, by weight, the first POE resin is 40 to 100 parts, the first cross-linking agent is 0.1 to 2 parts, and the first auxiliary cross-linking agent is 0.2 to 2 parts; Preferably, the number average molecular weight of the first POE resin is 10,000 to 100,000; Preferably, the first cross-linking agent is an organic peroxide; more preferably, the first cross-linking agent is selected from the group consisting of tert-butyl isopropyl peroxycarbonate, 2,5-dimethyl-2,5-(bis-tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-dimethyl-2,5-bis(benzoylperoxy)-hexane, tert-amyl peroxycarbonate and tert-butyl peroxy-3,3,5-trimethylhexanoate; Preferably, the first auxiliary crosslinking agent is selected from allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane ... At least one of propane tetraacrylate, ditrimethylolpropane tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclopentane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; Preferably, the weight content of the ultraviolet absorber in the raw material components of the POE layer is 0.05-2.0%.

4. The packaging film according to claim 3, characterized in that The raw material components of the POE layer also include a first silane coupling agent; Preferably, in the raw material components of the POE layer, the first silane coupling agent is 0.1 to 2 parts by weight; Preferably, the first silane coupling agent is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltri(β-methoxyethoxy)silane, γ-aminopropyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethylsilane and 3-aminopropyltrimethylsilane.

5. The packaging film according to claim 3, wherein: The raw material components of the POE layer also include silane-modified POE resin and a catalyst; Preferably, in the raw material components of the POE layer, the silane-modified POE resin is 5 to 60 parts by weight; Preferably, the silane-modified POE resin is selected from at least one of a silane-grafted ethylene and propylene copolymer, a silane-grafted ethylene and butene copolymer, a silane-grafted ethylene and pentene copolymer, a silane-grafted ethylene and hexene copolymer, or a silane-grafted ethylene and octene copolymer; Preferably, the number average molecular weight of the silane-modified POE resin is 10,000 to 100,000; Preferably, the weight ratio of the silane-modified POE resin to the catalyst is (500-150000):1; Preferably, the catalyst is selected from dimethylbenzylamine, 1,4-dimethylpiperazine, 1,8-diazabicyclo[5,4,0]undec-7-ene, dibutyltin dilaurate, stannous octoate, dioctyltin dithiol, dibutyltin oxide, dibutyltin diacetate, di(dodecylsulfide)dibutyltin, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, triethylenediamine, N'N'N'N-tetramethylalkylenediamine, N'N'N'N-pentamethyldiethylenetriamine, triethylamine, N'N-dimethylbenzylamine, N'N-dimethylhexadecylamine, N'N-dimethylbutylamine, triethylenediamine, At least one of amine, N-ethylmorpholine, N-methylmorpholine, N'N-diethylpiperazine, N'N-diethyl-2-methylpiperazine, N'N-bis-(α-hydroxypropyl)-2-methylpiperazine, N-2-hydroxypropyldimethylmorpholine, triethanolamine, N'N-dimethylethanolamine, pyridine, N'N-lutidine, potassium carboxylate, 2,4,6-tris(dimethylaminomethyl)phenol, trimethyl-N-2-hydroxypropylhexanoic acid, 1,3,5-tris(dimethylaminopropyl)-hexahydrotriazine, naphthalenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, dibutyltin laurate maleate, organic bismuth, organic lead and organic mercury.

6. The packaging film according to claim 3, characterized in that The raw material components of the POE layer also include a photoinitiator crosslinking agent; Preferably, in the raw material components of the POE layer, the photoinitiator crosslinking agent is 0.1 to 2.0 parts by weight; Preferably, the photoinitiator crosslinking agent is an ultraviolet light-initiator crosslinking agent; preferably, the ultraviolet light-initiator crosslinking agent is selected from benzophenone, 4-chlorobenzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, isopropylthioxanthone, benzoin dimethyl ether, ethyl 4-(N,N-dimethylamino)benzoate, methyl o-benzoylbenzoate, 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl- At least one of 2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and methyl benzoylformate.

7. The packaging film according to any one of claims 1 to 6, characterized in that The raw material components of the PVB layer include: PVB resin, pigment and the optional ultraviolet absorber; Preferably, in the raw materials of the PVB layer, the weight content of the PVB resin is 90-99.9%, and the weight content of the pigment is 0.1-10%; Preferably, the number average molecular weight of the PVB resin is 40,000 to 200,000; Preferably, the thickness of the PVB layer is 20 to 100 μm; Preferably, the weight content of the ultraviolet absorber in the raw material components of the PVB layer is 0.05-2.0%; Preferably, the weight content of water in the raw material components of the PVB layer is 0.2% to 2%.

8. The packaging film according to any one of claims 1 to 6, characterized in that The raw material components of the adhesion-promoting layer include: a base resin, a second cross-linking agent, a second auxiliary cross-linking agent, a second silane coupling agent and the optional ultraviolet absorber; Preferably, in the raw material components of the adhesion-promoting layer, the base resin is 100 parts, the second cross-linking agent is 0.1 to 2 parts, the second auxiliary cross-linking agent is 0.1 to 2 parts, and the second silane coupling agent is 0.1 to 1.5 parts; Preferably, the matrix resin is EVA resin and / or a second POE resin; Preferably, the thickness of the adhesion-promoting layer is 100 to 600 μm; Preferably, the ML value of the adhesion-promoting layer is less than or equal to the ML value of the POE layer; Preferably, the number average molecular weight of the EVA resin is 10,000 to 100,000; Preferably, the number average molecular weight of the second POE resin is 10,000 to 100,000; Preferably, the second cross-linking agent is an organic peroxide; more preferably, the second cross-linking agent is selected from at least one of tert-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-(bis-tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, 2,2-bis(tert-butylperoxy)butane, tert-amyl peroxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-dimethyl-2,5-bis(benzoylperoxy)-hexane, tert-amyl peroxycarbonate and tert-butyl peroxy-3,3,5-trimethylhexanoate; Preferably, the second auxiliary crosslinking agent is selected from allyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, trimethylolpropane tetraacrylate, ditrimethylolpropane tetraacrylate, At least one of propane tetraacrylate, ditrimethylolpropane tetramethacrylate, propoxylated pentaerythritol tetraacrylate, 2,4,6-tris(2-propenyloxy)-1,3,5-triazine, tricyclopentane dimethanol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; Preferably, the second silane coupling agent is at least one selected from vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, vinyltriacetoxysilane, vinyltris(β-methoxyethoxy)silane, γ-aminopropyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethylsilane and 3-aminopropyltrimethylsilane; Preferably, the weight content of the ultraviolet absorber in the raw material components of the adhesion-promoting layer is 0.05-2.0%.

9. The method for preparing a packaging film according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: A PVB layer is coated on the surface of a release substrate; a POE layer is provided on the surface of the PVB layer away from the release substrate; and an adhesion-promoting layer is provided on the surface of the POE layer away from the release substrate to obtain the encapsulation film.

10. The method for preparing the encapsulating film according to claim 9, wherein: When the raw material group of the POE layer includes a silane-modified POE resin and a catalyst, the preparation method includes the following steps: The raw materials of the PVB layer are mixed with a first solvent to obtain a mixed slurry; the mixed slurry is applied to the surface of the release substrate and dried to form a PVB layer; a POE layer and a tackifying layer are sequentially formed on the surface of the PVB layer away from the release substrate by a first multi-layer co-extrusion method; or, a POE layer is first formed on the surface of the PVB layer away from the release substrate by a first lamination method, and then a tackifying layer is formed on the side of the POE layer away from the PVB to obtain the encapsulating film; or, When the raw material components of the POE layer only contain the first cross-linking agent and do not contain the silane-modified POE resin, the catalyst and the photoinitiator cross-linking agent, the preparation method comprises the following steps: mixing the raw material of the PVB layer with the first solvent to obtain a mixed slurry, applying the mixed slurry on the surface of the release substrate, and drying to form a PVB layer; on the surface of the PVB layer on the side away from the release substrate, a POE layer and a tackifying layer are sequentially formed by a second multi-layer co-extrusion method; or, on the surface of the PVB layer on the side away from the release substrate, a POE layer is first formed by a second lamination method, and then a tackifying layer is formed on the side of the POE layer away from the PVB to obtain a pre-encapsulated film; performing electron irradiation on one side of the PVB layer of the pre-encapsulated film to obtain the encapsulated film; or, When the raw material group of the POE layer includes a photoinitiator crosslinking agent, the preparation method includes the following steps: mixing the raw material of the PVB layer with a first solvent to obtain a mixed slurry; applying the mixed slurry to the surface of the release substrate and drying to form a PVB layer; sequentially forming a POE layer and a tackifying layer on the surface of the PVB layer away from the release substrate by a third multi-layer co-extrusion method; or, first forming a POE layer on the surface of the PVB layer away from the release substrate by a third lamination method, and then forming a tackifying layer on the side of the POE layer away from the PVB to obtain a pre-encapsulation film; and performing an ultraviolet irradiation operation on one side of the PVB layer of the pre-encapsulation film to obtain the encapsulation film. Preferably, during the electron irradiation process, the energy of the electrons is 0.1 to 0.4 eV, and the irradiation intensity is 15 to 50 kGy; Preferably, during the ultraviolet irradiation process, the irradiation intensity is 0.01 to 0.10 kWh / m 2 ; Preferably, the drying temperature is 50-100°C and the drying time is 5-60 minutes; Preferably, the first solvent is a mixture of ethanol and xylene; more preferably, the volume ratio of the ethanol to the xylene is (0.2-5):1; Preferably, in the mixed slurry, the weight content of the first solvent is 60-90%.

11. A laminated glass, characterized in that: The laminated glass comprises the encapsulation film according to any one of claims 1 to 8; Alternatively, the laminated glass comprises an encapsulating adhesive film prepared by the preparation method according to claim 9 or 10.

Images