CN115368830A - Adhesive film, preparation method and application thereof - Google Patents

Abstract

The invention provides a glue film, a preparation method and application thereof. After the adhesive film is subjected to lamination treatment, the Shore A hardness of the adhesive film is less than 80; the storage modulus of the adhesive film at 40 ℃ is less than 10MPa, the storage modulus at 60 ℃ is less than 4MPa, and the storage modulus at 85 ℃ is less than 1.3MPa. Based on the method, the hidden crack probability is effectively reduced by reducing the hardness and the storage modulus of the adhesive film at the initial stage. Note that the lamination-induced latent cracking generally occurs in the initial pressing stage after the lamination heating stage (evacuation stage). Under the action of stress in subsequent processing or use, particularly in the process of laminating with the cell, the adhesive film can better protect the cell and prevent the cell from generating a hidden crack phenomenon, so that the power generation efficiency of the photovoltaic module is improved.

Description

Adhesive film, its preparation method and application

technical field

The invention relates to the field of photovoltaics, in particular to an adhesive film, its preparation method and application.

Background technique

When the white packaging material is used as the back layer adhesive film of the photovoltaic packaging material, because of its high reflectivity, it can provide photovoltaic modules with higher power generation efficiency than the transparent adhesive film, so it is welcomed by module manufacturers. However, the special material structure of the white packaging material leads to its high hardness and storage modulus. During use, especially during the lamination process, it will cause cracks in the battery sheet, resulting in a decrease in the power generation efficiency of the photovoltaic module. . Therefore, it is imminent to develop an adhesive film with both high reflectivity and low hardness and low storage modulus.

Contents of the invention

The main purpose of the present invention is to provide an adhesive film, its preparation method and application, so as to solve the problem in the prior art that the adhesive film is prone to cracks due to its high hardness and storage modulus.

In order to achieve the above object, according to one aspect of the present invention, an adhesive film is provided. After lamination, the Shore A hardness of the film is <80; the storage modulus of the film is <10MPa at 40°C, <4MPa at 60°C, and the storage modulus at 85°C The energy modulus is <1.3MPa.

Further, the adhesive film is a transparent adhesive film or a colored adhesive film. The colored film is preferably a white film.

Further, during the lamination process, the treatment temperature is 130-170° C., and the treatment time is 5-30 minutes; the cross-linking degree of the adhesive film is >80%, and the peel strength with the back plate is >40 N/cm.

Further, the adhesive film includes a host resin and fillers and functional additives dispersed in the host resin; wherein the functional additive is liquid rubber; preferably, the liquid rubber is selected from liquid polysulfide rubber, liquid nitrile rubber, liquid One or more of silicone rubber.

Further, the liquid rubber has a viscosity of 1000-10000 pcs at 23°C.

Further, in parts by weight, the adhesive film includes 100 parts of main resin, 0-50 parts of filler and 0.5-5 parts of functional additives.

Furthermore, the adhesive film also includes a processing aid dispersed in the main resin, and the processing aid is a polymer dispersant with a melting point below 110°C.

Further, the polymer dispersant is selected from polyethylene wax, polypropylene wax, silicone wax, ethylene-propylene copolymer, hexenyl bis-stearamide, monoglyceride stearate, glyceryl tristearate, liquid paraffin , microcrystalline paraffin, barium stearate, cadmium stearate, magnesium stearate, copper stearate in one or more.

Further, the added amount of the processing aid is 0.01-1% of the weight of the main resin.

Further, the adhesive film also includes an encapsulation aid dispersed in the main resin, and the encapsulation aid is selected from one of cross-linking agents, auxiliary cross-linking agents, heat stabilizers, light stabilizers, antioxidants, and ultraviolet light absorbers. one or more; preferably, the amount of the encapsulation aid added is 0.01-1% of the weight of the main resin.

Further, the filler is selected from one or more of titanium dioxide, barium sulfate, bentonite, white carbon black, wollastonite, whisker silicon, talc, magnesium hydroxide, magnesium oxide, aluminum hydroxide, and aluminum oxide; Preferably, the filler is modified by one or more of silane coupling agent, titanate coupling agent, stearic acid, and palmitic acid; preferably, the main resin is selected from EVA and/or POE.

In order to achieve the above purpose, according to one aspect of the present invention, a method for preparing the above adhesive film is provided. The preparation method comprises the following steps: mixing the raw materials of the adhesive film, and performing melt extrusion, casting to form a film, and cooling to obtain an adhesive film; or sequentially performing melt extrusion, casting to form a film, cooling, and pre-crosslinking , to obtain an adhesive film, wherein the pre-crosslinking process adopts one or more of thermal crosslinking, ultraviolet crosslinking, and radiation crosslinking.

In order to achieve the above object, according to one aspect of the present invention, a use of the above adhesive film is provided. The adhesive film is used as an electronic device packaging adhesive film, and the electronic device is selected from photovoltaic modules, light-emitting semiconductor LEDs, organic light-emitting semiconductor OLEDs or display screens.

After the adhesive film provided by the present invention is laminated, its Shore A hardness < 80 (market conventional white film hardness > 80); The elastic modulus is <4MPa, and the storage elastic modulus at 85°C is <1.3MPa. The adhesive film provided by the invention has low storage modulus and low hardness. Under the stress of subsequent processing or use, especially in the process of laminating with cells, the adhesive film can better protect cells and prevent cracks in cells, thereby improving the power generation efficiency of photovoltaic modules.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below in conjunction with examples.

As described in the background technology section, the adhesive film in the prior art has high hardness and storage modulus, which makes the cell easily cracked. In order to solve the above-mentioned problems, the present invention provides a kind of adhesive film, after the adhesive film is laminated, its Shore A hardness is <80; The storage modulus is <4MPa, and the storage modulus at 85°C is <1.3MPa. Based on this, the present invention effectively reduces the probability of cracks by reducing the hardness and storage modulus of the adhesive film at the initial stage. It should be noted that the cracks caused by lamination usually occur in the initial pressurization stage after the lamination heating stage (vacuumization stage). Under the stress of subsequent processing or use, especially in the process of laminating with cells, the adhesive film can better protect cells and prevent cracks in cells, thereby improving the power generation efficiency of photovoltaic modules.

The adhesive film can be a transparent adhesive film or a colored adhesive film. For the purpose of further balancing the reflectivity and low modulus of the adhesive film, the adhesive film is preferably a colored adhesive film, more preferably a white adhesive film.

Preferably, during the lamination treatment, the treatment temperature is 130-170° C., and the treatment time is 5-30 minutes. After lamination, its Shore A hardness is <80. At the same time, at 130-170°C, the adhesive film is thermally cured. After curing, the rubber molecular chains are cross-linked and shaped, and with the addition of fillers, the laminated adhesive film still has a good encapsulation effect, such as no color on the appearance. Adhesive film overflow, wrinkles, etc. appear, and the backplane has good adhesion, etc. Preferably, the cross-linking degree of the adhesive film is >80%, and the peeling strength with the back sheet is >40N/cm. Preferably, the reflectance of the adhesive film is >94%. Based on this, the adhesive film of the present invention not only has high reflectivity, but also has low hardness and low storage modulus. Under the stress of subsequent processing or use, especially in the process of laminating with the battery sheet, the adhesive film can better protect the battery sheet, prevent the cell from cracking, and has other good packaging properties, so that Improve the power generation efficiency of photovoltaic modules.

Preferably, the adhesive film includes a host resin, fillers and functional additives dispersed in the host resin; wherein, the functional additive is liquid rubber. In the adhesive film provided by the invention, liquid rubber and filler are added to the main resin. Liquid rubber has good flexibility, and because it is in a liquid state, it is easy to add to the main resin and show a good dispersion state in it. Therefore, adding such rubber soft chain molecules can effectively reduce the hardness and energy storage of the film modulus. At the same time, the introduction of fillers into the film not only maintains the excellent properties of the film itself, such as high reflectivity, but also increases the stability of the three-dimensional network structure of the soft chain molecules of the rubber to a certain extent by using the fillers, thereby promoting the stability of the film. While being more flexible, it can better maintain the microscopic shape to the subsequent process.

Preferably, the liquid rubber is selected from one or more of liquid polysulfide rubber, liquid nitrile rubber, and liquid silicone rubber. Based on the above-mentioned types of liquid rubber, it has better compatibility with the main resin and filler, and can form a flexible three-dimensional network structure with relatively small additions, thereby further reducing the hardness and energy storage of the film. Modulus, improve the problem of cell cracks.

For the purpose of further improving the compatibility and dispersibility of the liquid rubber with other components, preferably, the viscosity of the liquid rubber at 23° C. is 1000˜10000 pcs.

Preferably, in parts by weight, the adhesive film includes 100 parts of main resin, 0-50 parts of filler and 0.5-5 parts of functional additives. Controlling the dosage relationship of the balanced adhesive film components within the above range is more conducive to the comprehensive performance of the adhesive film, so that it can further improve the flexibility of the adhesive film while satisfying the packaging performance of the adhesive film itself, and reduce the hidden cracks of the packaging components probability. More preferably, in parts by weight, the adhesive film includes 100 parts of main resin, 5-20 parts of filler and 0.5-5 parts of functional additives.

Preferably, the adhesive film further includes a processing aid dispersed in the main resin, and the processing aid is a polymer dispersant with a melting point below 110°C. The present invention can improve the compatibility of liquid rubber and filler by adding the above-mentioned processing aid in the main resin, effectively avoid filler agglomeration, and promote the filler to disperse more uniformly in the main resin. More preferably, the polymer dispersant is selected from one or more of PE wax, PP wax, silicone wax, and ethylene-propylene copolymer. Based on this, each component in the film can have better compatibility with less processing aids, the dispersion uniformity of fillers in the main resin is better, and the relationship between fillers and polymers is also greatly improved. The interfacial effect between them makes the adhesive film have better performance.

In order to further improve the compatibility between the filler, the main resin and the liquid rubber, and improve the flexibility of the rubber film, it is preferred that the amount of the processing aid added is 0.01-1% by weight of the main resin.

In a preferred embodiment, the adhesive film also includes an encapsulation aid dispersed in the host resin (the adhesive film at this time is used as an encapsulation adhesive film), and the encapsulation aid is selected from cross-linking agents, auxiliary cross-linking agents, thermal One or more of stabilizers, light stabilizers, antioxidants, and UV absorbers. Preferably, the encapsulation aid is added in an amount of 0.01-1% by weight of the main resin. Based on this, the excellent packaging properties of the adhesive film itself can be better maintained, while the hardness and storage modulus are lower, and it can be better used in subsequent use or processing, especially in the lamination process with battery sheets. Protect the cell and prevent the cell from cracking.

Preferably, the above-mentioned crosslinking agent is a peroxide crosslinking agent, including but not limited to tert-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane , 1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-butylperoxycarbonate-2-ethylhexyl, 2,5-dimethyl-2,5 - Di(tert-butylperoxy)hexane, 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-bis(benzoylperoxy)-hexane, tert-peroxycarbonate One or more of amyl esters, tert-butyl peroxide 3,3,5-trimethylhexanoate. Preferably, the above-mentioned antioxidants are hindered phenolic antioxidants or phosphite antioxidants, including but not limited to β(3,5-di-tert-butyl-4-hydroxyphenyl) pentaerythritol propionate, β(3 , 5-di-tert-butyl-4-hydroxyphenyl) propionate octadecyl alcohol ester, N,N'-bis[β(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] Hydrazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)1,3,5-triazine-2,4,6-(1H,3H,5H)-trione , Tris(2,4-di-tert-butylphenol) phosphite, bis(3,5-di-tert-butylphenyl) pentaerythritol diphosphite. Preferably, the above-mentioned light stabilizer is a hindered amine light stabilizer, including but not limited to 3,5-di-tert-butyl-4-hydroxy-hexadecyl benzoate, tris(1,2,2,6,6- Pentamethyl-4-piperidinyl) phosphite, bis-2,2,6,6-tetramethylpiperidinol sebacate, bis-1-decyloxy-2,2,6, 6-Tetramethylpiperidin-4-ol sebacate, polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, N,N'- Bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and morpholine-2,4,6-trichloro-1,3,5-triazine one or more of polymers. Preferably, the above-mentioned ultraviolet absorbers include but are not limited to 2-hydroxyl-4-n-octyloxybenzophenone, 2,2-tetramethylenebis(3,1-benzoxazin-4-one), 2 - one or more of (2'-hydroxy-5-methylphenyl)benzotriazole, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone. Preferably, the aforementioned co-crosslinking agents include but are not limited to 1,3,5-triallyl-s-triazine-2,4,6-trione, N,N'-m-phenylbismaleimide, tris Methylolpropane Triacrylate, 1,2-Polybutadiene, Triallyl Isocyanate, Triallyl Isocyanate, Diallyl Phthalate, Triallyl Cyanurate, Triene Propyl isocyanurate. Preferred heat stabilizers include, but are not limited to, 2,2-methylene-bis-(4-methyl-6-tert-butyl)phenol, 1,3,5-tris(4-tert-butyl-3-hydroxy -2,6-dimethylbenzyl), 3,5-di-tert-butyl-4-hydroxy-hexadecyl benzoate, distearyl pentaerythritol diphosphite, bisphenol A bis(di One or more of phenyl phosphate).

In order to further improve the white performance of the packaging film, and then meet the needs of high reflectivity of the film, in a preferred embodiment, the filler is selected from titanium dioxide, barium sulfate, bentonite, white carbon black, wollastonite, whiskers One or more of silicon, talcum powder, magnesium hydroxide, magnesium oxide, aluminum hydroxide, aluminum oxide; preferably, the filler is silane coupling agent, titanate coupling agent, stearic acid, palmitate One or more modified fillers in acid. The modified filler is easier to disperse in the main resin, and forms a better physical bond and/or chemical bond with the polymer components, which is more stable between phases and is more conducive to the advantages of the components , Improve the application properties of the film.

Specifically, the host resin can be a common resin substrate in this field, and the host resin is selected from ethylene and vinyl acetate, propylene, butene, pentene, hexene, octene, methyl acrylate, methyl methacrylate, butylene Binary or multiple copolymers of diene, 1,4-pentadiene, isoprene, ethylidene norbornene, dicyclopentadiene, 1,4-hexadiene, polyvinyl butyral, butane Block copolymers of alkene/isoprene and styrene, natural rubber, trans polyisoprene rubber. Preferably, the host resin is selected from EVA and/or POE. What needs to be explained here is that if EVA and/or POE are selected as the main resin, and the above-mentioned liquid rubber is used as a functional auxiliary agent, the obtained adhesive film has better beneficial effects.

According to another aspect of the present invention, a method for preparing the aforementioned adhesive film is also provided. The preparation method comprises the following steps: mixing the raw materials of the adhesive film, and performing melt extrusion, casting to form a film, and cooling to obtain an adhesive film; or sequentially performing melt extrusion, casting to form a film, cooling, and pre-crosslinking Finally, the adhesive film is obtained, wherein the pre-crosslinking process adopts one or more of thermal crosslinking, ultraviolet crosslinking, and radiation crosslinking.

In the adhesive film provided by the invention, liquid rubber and filler are added to the main resin. Liquid rubber has good flexibility, and because it is in a liquid state, it is easy to add to the main resin and show a good dispersion state in it. Therefore, adding such rubber soft chain molecules can effectively reduce the hardness and storage capacity of the film surface. energy modulus. At the same time, the introduction of fillers not only maintains the excellent properties of the film itself such as high reflectivity, but also can use fillers to increase the stability of the three-dimensional network structure of the rubber soft chain molecules to a certain extent, so that the film can be more flexible. At the same time, it can better maintain the microscopic morphology to the subsequent process. Under the stress of subsequent processing or use, especially in the process of laminating with cells, the adhesive film can better protect cells and prevent cracks in cells, thereby improving the yield of photovoltaic modules. Moreover, in the preparation process, the adhesive film is pre-crosslinked by one or more methods of thermal crosslinking, ultraviolet crosslinking, and radiation crosslinking, which effectively solves the fluidity problem of the colored packaging adhesive film and promotes its The fluidity of the surface is reduced, and problems such as whitening will not occur in the later lamination process. After pre-crosslinking and setting, the above-mentioned film can be further cut and rolled to obtain finished products.

According to yet another aspect of the present invention, a use of the above adhesive film is also provided. The adhesive film is used as an electronic device packaging adhesive film, and the electronic device is selected from photovoltaic modules, light-emitting semiconductor LEDs, organic light-emitting semiconductor OLEDs or display screens.

The present application will be described in further detail below in conjunction with specific examples, and these examples should not be construed as limiting the scope of protection claimed in the present application.

Example 1

100 parts by weight of EVA (MFR: 11g/10min; VA content is 28% by weight), 10 parts by weight of titanium dioxide (DuPont R960), 1 part by weight of liquid polysulfide rubber, 0.01 parts by weight of PE wax, and 0.3 parts by weight of polysulfide Joint agent tert-butyl peroxyisopropyl carbonate, 0.01 parts by weight antioxidant β (3,5-di-tert-butyl-4-hydroxyphenyl) pentaerythritol propionate, 0.01 parts by weight light stabilizer tris(1, 2,2,6,6-pentamethyl-4-piperidinyl) phosphite and 0.02 parts by weight of auxiliary crosslinking agent 1,3,5-triallyl-s-triazine-2,4,6- Triketone, fully mixed by a ribbon mixer and then extruded into a film by a single-screw extruder with a T-shaped die head. The temperature of the screw sleeve is gradually increased from interval 2 to interval 10, from 50°C to 80°C , the temperature of the die head is set at 100°C, the film is cooled and rolled after being embossed by an embossing stick, and then sent to the bottom of the electron radiation equipment with 600keV energy after cooling, and the above film is irradiated with electron beams, and the irradiation dose is 30kGy, finally wound up to obtain the film E1. The thickness of E1 is 0.45mm, and the degree of pre-crosslinking is 45%.

Among them, the viscosity of liquid rubber at 23°C is 2000pcs.

Example 2

The difference from Example 1 is that the amount of liquid polysulfide rubber is replaced by liquid nitrile rubber to obtain a film E2 with a thickness of 0.45 mm. Among them, the viscosity of the liquid nitrile rubber at 23°C is 2000pcs.

Example 3

The difference from Example 1 is that the amount of liquid polysulfide rubber is replaced by liquid silicone rubber to obtain a film E3 with a thickness of 0.45 mm. Among them, the liquid silicone rubber has a viscosity of 2000pcs at 23°C.

Example 4

The difference from Example 1 is only that the amount of liquid polysulfide rubber used is 0.5 parts by weight to obtain a film E4 with a thickness of 0.45 mm. Among them, the viscosity of liquid rubber at 23°C is 2000pcs.

Example 5

The difference from Example 1 is only that the amount of liquid polysulfide rubber used is 2.5 parts by weight to obtain a film E5 with a thickness of 0.45 mm.

Example 6

The difference from Example 1 is that 100 parts by weight of EVA and the like are replaced by POE (MFR: 10 g/10 min; octene content is 40% by weight). Obtained film E6, the thickness of E6 is 0.45mm.

Example 7

The difference from Example 1 is only that the amount of liquid polysulfide rubber used is 4 parts by weight to obtain an adhesive film E7 with a thickness of 0.45 mm.

Example 8

The difference from Example 1 is only that the amount of liquid polysulfide rubber used is 5 parts by weight to obtain an adhesive film E8 with a thickness of 0.45 mm.

Example 9

The difference from Example 1 is that Example 9 is a transparent adhesive film, and no titanium dioxide is added to the formula to obtain an adhesive film E9 with a thickness of 0.45 mm.

Comparative example 1

The difference with embodiment 1 is: no liquid rubber and processing aids are added. The film E10 was obtained.

Performance Characterization:

1. Degree of cross-linking

The degree of crosslinking before and after lamination was tested by xylene heating and extraction. The ratio of the mass not dissolved in xylene to the initial mass is the degree of crosslinking. Take the arithmetic mean value of the three samples as the degree of crosslinking of the film, in %. The degree of cross-linking before lamination (pre-cross-linking degree) refers to the degree of cross-linking of the encapsulation film directly heated and extracted with xylene; Degree of crosslinking after pressing.

2. Appearance evaluation of double-glass modules with adhesive film

Use the adhesive film to carry out the single glass component encapsulation test, put it into the vacuum laminator in the order of glass/F406P (as the front layer encapsulation material)/cell sheet/encapsulation film of the present invention/back plate, at 145°C, first pump Pressurize after vacuum, co-cure for 18min. Observe the appearance of double-glass components such as slicing and splitting. Cracks are confirmed by EL testing. The peel strength with the backplane has passed the test of GB/T31034-2014.

3. Reflectivity

After the film was laminated at 145°C for 8 minutes, it was tested with reference to the GB/T 13452.3-92 standard.

4. Shore hardness A

After the film was laminated at 145°C for 8 minutes, it was tested with reference to the GBT2411-2008 standard.

5. Storage modulus

After the adhesive film was laminated at 145°C for 8 minutes, it was tested with reference to the ASTM E2254-2009 standard.

The test results are shown in Table 1:

Table 1

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. An adhesive film is characterized in that the Shore A hardness of the adhesive film is less than 80 after lamination treatment; the storage modulus of the adhesive film at 40 ℃ is less than 10MPa, the storage modulus at 60 ℃ is less than 4MPa, and the storage modulus at 85 ℃ is less than 1.3MPa.

2. The adhesive film according to claim 1, wherein the adhesive film is a transparent adhesive film or a colored adhesive film, and the colored adhesive film is preferably a white adhesive film.

3. The adhesive film according to claim 1 or 2, wherein in the lamination process, the processing temperature is 130-170 ℃ and the processing time is 5-30 min; the crosslinking degree of the adhesive film is more than 80%, and the peel strength of the adhesive film and the back plate is more than 40N/cm.

4. The adhesive film according to any one of claims 1 to 3, wherein the adhesive film comprises a host resin and a filler and a functional auxiliary dispersed in the host resin; wherein the functional auxiliary agent is liquid rubber; preferably, the liquid rubber is selected from one or more of liquid polysulfide rubber, liquid nitrile rubber, liquid silicone rubber.

5. The glue film of claim 4, wherein the liquid rubber has a viscosity of 1000 to 10000pcs at 23 ℃.

6. The adhesive film according to claim 4, wherein the adhesive film comprises 100 parts by weight of the main resin, 0 to 50 parts by weight of the filler, and 0.5 to 5 parts by weight of the functional additive.

7. The adhesive film according to claim 4, further comprising a processing aid dispersed in the host resin, wherein the processing aid is a polymeric dispersant having a melting point of 110 ℃ or lower.

8. The adhesive film according to claim 7, wherein the polymeric dispersant is selected from one or more of polyethylene wax, polypropylene wax, silicone wax, ethylene-propylene copolymer, hexenyl bis-stearamide, glyceryl monostearate, glyceryl tristearate, liquid paraffin, microcrystalline paraffin, barium stearate, cadmium stearate, magnesium stearate, and copper stearate.

9. The glue film of claim 7, wherein the processing aid is added in an amount of 0.01 to 1% by weight of the host resin.

10. The adhesive film of claim 4, further comprising an encapsulation aid dispersed in the host resin, wherein the encapsulation aid is selected from one or more of a cross-linking agent, a co-cross-linking agent, a heat stabilizer, a light stabilizer, an antioxidant, and an ultraviolet light absorber; preferably, the addition amount of the packaging auxiliary agent is 0.01-1% of the weight of the main resin.

11. Glue film according to claim 6, wherein the filler is selected from one or more of titanium dioxide, barium sulfate, bentonite, white carbon, wollastonite, silicon whiskers, talc, magnesium hydroxide, magnesium oxide, aluminum hydroxide, aluminum oxide; preferably, the filler is modified by one or more of silane coupling agent, titanate coupling agent, stearic acid and palmitic acid; preferably, the host resin is selected from EVA and/or POE.

12. A method for preparing the adhesive film according to any one of claims 1 to 11, comprising the steps of:

mixing the raw materials of the adhesive film, and performing melt extrusion, tape casting film forming and cooling on the mixture to obtain the adhesive film; or sequentially carrying out melt extrusion, tape casting film forming, cooling and pre-crosslinking to obtain the adhesive film, wherein the pre-crosslinking process adopts one or more of thermal crosslinking, ultraviolet crosslinking and radiation crosslinking.

13. Use of the adhesive film according to any one of claims 1 to 11 as an encapsulating adhesive film for electronic devices selected from photovoltaic modules, light emitting semiconductor LEDs, organic light emitting semiconductor OLEDs or display screens.