High-temperature-resistant and high-weather-resistant EVA (Ethylene Vinyl Acetate) packaging adhesive film for photovoltaic module and preparation method thereof

Abstract

The invention belongs to the technical field of photovoltaic packaging adhesive films, and particularly relates to a high-temperature-resistant and high-weather-resistant EVA packaging adhesive film for a photovoltaic module and a preparation method of the high-temperature-resistant and high-weather-resistant EVA packaging adhesive film. And / or granulating the silicon dioxide master batch; and hydrotalcite master batch granulation: modifying nano hydrotalcite with a silane coupling agent or stearic acid, then performing drying treatment, premixing with EVA particles according to a mass ratio of (10-30): (70-90), then blending with the EVA particles, extruding at 120-150 DEG C, performing air-drying granulation, and shearing to obtain the hydrotalcite master batch. Uniformly mixing the EVA particles with the high-temperature-resistant master batch and the auxiliary agent, extruding and mixing at 110-120 DEG C, casting, knurling and cooling to obtain the EVA packaging adhesive film; wherein the high-temperature-resistant master batch comprises hydrotalcite master batch, aluminum oxide master batch and / or silicon dioxide master batch.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic encapsulation films, and in particular relates to an EVA encapsulation film for photovoltaic modules with high temperature resistance and high weather resistance, and a preparation method thereof. Background Art

[0002] Photovoltaic module encapsulation film is a key material in photovoltaic modules, primarily used to protect solar cells from environmental influences while ensuring efficient light transmission and long-term stability. Ethylene-vinyl acetate copolymer (EVA) film has become a mainstream encapsulation material due to its excellent light transmittance, adhesion, and cost advantages. However, the rapid development of photovoltaic technology, particularly the popularization of high-efficiency cells such as N-type TOPCon and HJT, has placed higher demands on the high-temperature and weather resistance of encapsulation films.

[0003] The main component of EVA film is ethylene-vinyl acetate copolymer, and additives such as cross-linking agents, antioxidants, and light stabilizers are usually added to improve its performance. However, the cross-linking and curing temperature of traditional EVA films is relatively high (140-145°C) and the curing time is relatively long (20-30 minutes), which affects production efficiency. In addition, traditional EVA films are prone to yellowing, delamination, and decreased light transmittance at high temperatures (>85°C). The decomposition of the cross-linking agent leads to a decrease in bonding strength, while the resistance to ultraviolet radiation and wet heat aging is insufficient, significantly affecting the life of the module. When photovoltaic modules are operated outdoors for a long time, they will experience harsh environments such as high temperature, ultraviolet radiation, and humidity changes. Therefore, high temperature resistance, high weather resistance, and anti-aging properties are crucial.

[0004] Although new inorganic nano-high-temperature resistant fillers have been introduced into existing EVA films, these fillers and EVA resins will still show serious yellowing and power reduction problems after aging.

[0005] Therefore, how to overcome the defect of high temperature resistant EVA encapsulation film not being resistant to aging is a technical problem that needs to be solved urgently in this field.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0007] The embodiments of the present disclosure at least provide an EVA encapsulation film for photovoltaic modules that is resistant to high temperatures and highly weatherable, and a preparation method thereof.

[0008] In the first aspect, the embodiment of the present disclosure provides a method for preparing an EVA encapsulation film, including: granulating an alumina masterbatch, modifying nano-alumina with a titanate coupling agent or polyethylene glycol, and then pre-mixing it with liquid paraffin in a mass ratio of 20-40:60-80, and then blending it with EVA particles, extruding it at 130-160°C, air-drying and granulating it, and shearing it to prepare an alumina masterbatch; and / or granulating a silica masterbatch, hydrophobizing the surface of the nano-silica, and pre-mixing it with EVA particles in a mass ratio of 10-20:80-90, and then blending it with EVA particles, and extruding it at a low temperature of 100-130°C. The invention discloses a method for preparing a hydrotalcite masterbatch, wherein the hydrotalcite is modified with a silane coupling agent or stearic acid, and then dried and pre-mixed with EVA particles in a mass ratio of 10 to 30:70 to 90, and then blended with EVA particles, extruded at 120 to 150° C., air-dried and granulated, and sheared to obtain a hydrotalcite masterbatch; the EVA particles are uniformly mixed with the high-temperature resistant masterbatch and the additives, extruded and mixed at 110 to 120° C., and cast, embossed, and cooled to obtain an EVA encapsulating film; wherein the high-temperature resistant masterbatch comprises a hydrotalcite masterbatch and an alumina masterbatch and / or a silica masterbatch.

[0009] In an optional embodiment, the content of nano-alumina in the alumina masterbatch is 5-10%, and the particle size is 3-5 mm; the content of nano-silica in the silica masterbatch is 5-10%, and the particle size is 3-5 mm; the content of nano-hydrotalcite in the hydrotalcite masterbatch is 5-10%, and the particle size is 3-5 mm.

[0010] In an optional embodiment, the mass fractions of the components of the EVA particles, high-temperature resistant masterbatch and additives are: 100 parts of EVA particles; 1 to 10 parts of high-temperature resistant masterbatch; and the additives include the following mass fractions: 0.4 to 0.8 parts of cross-linking agent, 0.4 to 0.8 parts of co-cross-linking agent, 0.7 to 1 parts of UV curing agent, 0.4 to 1 parts of antioxidant, 0.1 to 1 parts of light stabilizer, and 0.2 to 0.8 parts of silane coupling agent.

[0011] In an optional embodiment, the VA content in the EVA particles is 5% to 40%, and the melt index at 120° C. is 0.1 to 40 g / 10 min, the melting point is 50 to 90° C., and the light transmittance is not less than 90%.

[0012] In an optional embodiment, the cross-linking agent includes at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxybenzoate, benzoyl peroxide, and diisopropylbenzene peroxide.

[0013] In an optional embodiment, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, γ-(methacryloyloxy)propyltrimethoxysilane, and N,N′-m-phenylbismaleimide.

[0014] In an optional embodiment, the UV curing agent includes at least one of ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, and neopentyl glycol polymethyl ethylene oxide diacrylate.

[0015] In an optional embodiment, the antioxidant includes at least one of bis(4-octylphenol) diphosphate, dibutylhydroxytoluene, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and tris[2,4-di-tert-butylphenyl]phosphite.

[0016] In an optional embodiment, the light stabilizer includes at least one of a hindered amine light stabilizer, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, mono(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and a polymer of succinic acid and (2,2,6,6-tetramethyl-4-piperidinyl)alcohol.

[0017] In an optional embodiment, the silane coupling agent includes at least one of γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyl tert-butyltriperoxide silane, vinyltriacetoxysilane or vinyltris(β-methoxyethoxy)silane.

[0018] In a second aspect, an embodiment of the present disclosure further provides an EVA encapsulation film, which comprises, by mass: 100 parts of EVA particles; 1 to 10 parts of high-temperature resistant masterbatch; and the auxiliary agents comprise the following parts by mass: 0.4 to 0.8 parts of a cross-linking agent, 0.4 to 0.8 parts of a co-cross-linking agent, 0.7 to 1 part of a UV curing agent, 0.4 to 1 part of an antioxidant, 0.1 to 1 part of a light stabilizer, and 0.2 to 0.8 parts of a silane coupling agent; and the yellowing index ΔYI of the EVA encapsulation film under 85°C / 85% RH conditions for 1000 hours is less than 2; the yellowing index ΔYI of the EVA encapsulation film under 150°C conditions for 1000 hours is less than 2.

[0019] In a third aspect, an embodiment of the present disclosure further provides a photovoltaic module comprising the EVA encapsulation film as described above.

[0020] The beneficial effect of the present invention is that the EVA encapsulation film for high-temperature resistant and highly weather-resistant photovoltaic modules and the preparation method thereof improve the compatibility with EVA particles by pre-dispersing the nano-high-temperature resistant filler after surface modification to avoid agglomeration, and then perform differentiated extrusion granulation on different types of high-temperature resistant fillers, which not only avoids resin degradation but also avoids structural decomposition of the filler, and improves the cross-linking degree of the film during the extrusion of the high-temperature resistant masterbatch and EVA resin, and utilizes the synergistic effect of hydrotalcite and SiO2 / Al2O3 to form physical cross-linking points, thereby achieving long-term weather resistance and high-temperature resistance of the EVA encapsulation film.

[0021] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail as follows. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0025] As used herein, expressions such as “at least one of,” when following a list of elements, modify the entire list of elements and do not modify the individual elements of the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0026] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0027] The present disclosure provides a method for preparing an EVA encapsulation film, comprising: granulating an alumina masterbatch, modifying nano-alumina with a titanate coupling agent or polyethylene glycol, premixing the modified nano-alumina with liquid paraffin at a mass ratio of 20-40:60-80, blending the modified nano-alumina with EVA particles, extruding the modified nano-alumina at a temperature of 130-160° C., air-drying the modified nano-alumina, and shearing the modified nano-alumina masterbatch; and / or granulating a silica masterbatch, hydrophobizing the surface of the nano-silica, premixing the modified nano-alumina with EVA particles at a mass ratio of 10-20:80-90, blending the modified nano-alumina with EVA particles, extruding the modified nano-alumina at a temperature of 100-130° C., and air-drying the modified nano-alumina. Dry granulation and shearing are used to prepare silica masterbatch; and hydrotalcite masterbatch granulation, nano hydrotalcite is modified with a silane coupling agent or stearic acid, followed by drying, premixed with EVA particles in a mass ratio of 10-30:70-90, and then blended with EVA particles, extruded at 120-150°C, air-dried granulated and sheared to prepare hydrotalcite masterbatch; EVA particles are uniformly mixed with high-temperature resistant masterbatch and additives, extruded and kneaded at 110-120°C, and cast, embossed and cooled to obtain EVA encapsulation film; wherein the high-temperature resistant masterbatch includes hydrotalcite masterbatch and alumina masterbatch and / or silica masterbatch.

[0028] Specifically, hydrotalcite (LDH) is a layered double hydroxide that has the function of UV shielding and absorption. Its layered structure can reflect and scatter ultraviolet (UV), reducing the degradation effect of UV on EVA. At the same time, the interlayer anions (such as CO3 2-) can absorb UV energy and convert it into harmless heat. The thermal stability of hydrotalcite allows it to decompose at high temperatures to absorb heat (releasing interlayer water molecules and CO2), delaying the thermal aging of EVA. Its decomposition products (such as MgO and Al2O3) can further block heat transfer. The layered structure hinders the penetration of oxygen and water molecules, slowing the oxidation and hydrolysis reactions of EVA. SiO2 nanoparticles form a three-dimensional network structure in EVA, restricting molecular chain movement and increasing the heat deformation temperature. Its high melting point (approximately 1700°C) can delay the softening of EVA at high temperatures. SiO2 also has high reflectivity to UV light (especially short-wavelength UV), which can reduce photooxidation reactions. The hydrophobicized SiO2 surface can reduce the water absorption of EVA and inhibit the release of acetic acid caused by hydrolysis (acetic acid accelerates the yellowing of EVA). The high melting point (2050°C) and low thermal conductivity of Al2O3 block thermal radiation and reduce the thermal degradation of EVA. Al2O3 also absorbs high-energy UV photons, dissipating energy through electron transitions, reducing free radical generation and providing superior UV and aging resistance. Furthermore, Al2O3 has a surface passivation effect. Nano-Al2O3 can fill micro-defects in EVA, reducing the permeation paths for oxygen and water and inhibiting oxidation reactions.

[0029] The synergistic effect of LDH and SiO2 / Al2O3 is reflected in the following: the layered structure of LDH forms "physical cross-linking points" with the nanoparticles of SiO2 / Al2O3, which jointly improve the mechanical strength and barrier properties. The alkaline surfaces of Al2O3 and LDH can neutralize the acidic substances (such as acetic acid) produced by the degradation of EVA, while the surface hydroxyl groups of SiO2 can capture free radicals and delay the chain reaction. In actual application, the composite filler increases the initial decomposition temperature of EVA by 20 to 30°C, can reduce bubbles and delamination at high temperatures, and has high temperature resistance. At the same time, under the test conditions of wet heat (85°C / 85% RH) and UV aging (such as 2000 hours), the yellowing index (ΔYI) of the composite modified EVA is reduced by more than 50%, and the transmittance retention rate exceeds 90%, with good weather resistance.

[0030] In summary, hydrotalcite, SiO2 and Al2O3 synergistically improve the high temperature resistance and weather resistance of EVA film through multiple mechanisms such as UV shielding, thermal stabilization, barrier effect and free radical capture.

[0031] In some embodiments, specifically, the content of nano-alumina in the alumina masterbatch is 5-10%, and the particle size is 3-5 mm; the content of nano-silica in the silica masterbatch is 5-10%, and the particle size is 3-5 mm; the content of nano-hydrotalcite in the hydrotalcite masterbatch is 5-10%, and the particle size is 3-5 mm.

[0032] In some embodiments, specifically, the mass fractions of the components of the uniform mixing of EVA particles, high temperature resistant masterbatch and additives are: 100 parts of EVA particles; 1 to 10 parts of high temperature resistant masterbatch; and the additives include the following mass fractions: 0.4 to 0.8 parts of cross-linking agent, 0.4 to 0.8 parts of co-cross-linking agent, 0.7 to 1 parts of UV curing agent, 0.4 to 1 parts of antioxidant, 0.1 to 1 parts of light stabilizer, and 0.2 to 0.8 parts of silane coupling agent.

[0033] In some embodiments, specifically, the VA content in the EVA particles is 5% to 40%, and the melt index at 120° C. is 0.1 to 40 g / 10 min, the melting point is 50 to 90° C., and the light transmittance is not less than 90%.

[0034] In some embodiments, specifically, the cross-linking agent includes at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxybenzoate, benzoyl peroxide, and dicumyl peroxide.

[0035] In some embodiments, specifically, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, γ-(methacryloyloxy)propyltrimethoxysilane, and N,N′-m-phenylbismaleimide.

[0036] In some embodiments, specifically, the UV curing agent includes at least one of ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, and neopentyl glycol polymethyl ethylene oxide diacrylate.

[0037] In some embodiments, specifically, the antioxidant includes at least one of bis(4-octylphenol) diphosphate, dibutylhydroxytoluene, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and tris[2,4-di-tert-butylphenyl]phosphite.

[0038] In some embodiments, specifically, the light stabilizer includes at least one of a hindered amine light stabilizer, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, mono(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and a polymer of succinic acid and (2,2,6,6-tetramethyl-4-piperidinyl) alcohol.

[0039] In some embodiments, specifically, the silane coupling agent includes at least one of γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyl tert-butyltriperoxide silane, vinyltriacetoxysilane or vinyltris(β-methoxyethoxy)silane.

[0040] An embodiment of the present disclosure also provides an EVA encapsulation film, which includes, by mass: 100 parts of EVA particles; 1 to 10 parts of high-temperature resistant masterbatch; and the auxiliary agents include the following parts by mass: 0.4 to 0.8 parts of a cross-linking agent, 0.4 to 0.8 parts of a co-cross-linking agent, 0.7 to 1 part of a UV curing agent, 0.4 to 1 part of an antioxidant, 0.1 to 1 part of a light stabilizer, and 0.2 to 0.8 parts of a silane coupling agent; and the yellowing index ΔYI of the EVA encapsulation film under 85°C / 85% RH conditions for 1000 hours is less than 2; the yellowing index ΔYI of the EVA encapsulation film under 150°C conditions for 1000 hours is less than 2.

[0041] The embodiments of the present disclosure further provide a photovoltaic module, comprising the EVA encapsulation film as described above.

[0042] The following are some embodiments of the present invention described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0043] Example 1:

[0044] Alumina (Al2O3) Masterbatch Granulation a. Pretreatment: Nano-Al2O3 is modified with a titanate coupling agent to improve dispersibility. It is then premixed with liquid paraffin at a mass ratio of 20:80 and then blended with EVA particles. b. Blending and Extrusion: Nano-alumina powder and EVA particles, surface-coating-treated, are sequentially added to a high-speed mixer, with an Al2O3 addition level of 5%. After uniform mixing in a high-speed mixer, the extrusion temperature is controlled at 130-160°C to prevent resin degradation. Extrusion is performed in a twin-screw extruder at 100 rpm, followed by air drying and granulation. Shearing produces a high-temperature resistant masterbatch (5% content) with a particle size of 3 mm.

[0045] Example 2:

[0046] Alumina (Al2O3) Masterbatch Granulation a. Pretreatment: Nano-Al2O3 is modified with polyethylene glycol (PEG) to improve dispersibility. It is then premixed with liquid paraffin at a mass ratio of 30:70 and then blended with EVA particles. b. Blending and Extrusion: Nano-alumina powder and EVA particles with polyethylene glycol (PEG) surface treatment are added to a high-speed mixer in sequence, with an Al2O3 addition level of 10% (a higher level will reduce the flexibility of the film). After stirring evenly in a high-speed mixer, the extrusion temperature is controlled at 130-160°C to prevent resin degradation. Extrusion is carried out in a twin-screw extruder at a speed of 100 rpm, air-dried into granules, and sheared to prepare high-temperature resistant masterbatch (content 10%) with a particle size of 3 mm.

[0047] Example 3:

[0048] Silica (SiO2) Masterbatch Granulation a. Pretreatment: Nano-SiO2 is treated with hexamethyldisilazane to achieve surface hydrophobicity and prevent agglomeration. It can be pre-dispersed with EVA resin in a high-speed mixer at a mass ratio of 10:90, and then blended with EVA particles. b. Blending and Extrusion: Add the surface-treated nano-silica powder and EVA particles to the high-speed mixer in sequence, with a SiO2 addition level of 5% (a higher level will affect light transmittance). Use low-temperature extrusion (100-130°C) to prevent SiO2 aggregation. Extrusion is carried out in a twin-screw extruder at a speed of 100 rpm to improve dispersion, followed by air drying and granulation. Shearing is then used to prepare high-temperature resistant masterbatch (5% content) with a particle size of 3 mm.

[0049] Example 4:

[0050] Silica (SiO2) Masterbatch Granulation a. Pretreatment: Nano-SiO2 is treated with hexamethyldisilazane to achieve surface hydrophobicity and prevent agglomeration. It can be pre-dispersed with EVA resin in a high-speed mixer at a mass ratio of 20:80, and then blended with EVA particles. b. Blending and Extrusion: Add the surface-treated nano-silica powder and EVA particles to the high-speed mixer in sequence, with a SiO2 addition level of 10% (a higher level will affect light transmittance). Use low-temperature extrusion (100-130°C) to prevent SiO2 aggregation. Extrusion is performed in a twin-screw extruder at 100 rpm to improve dispersion, followed by air drying and granulation. Shearing is then used to prepare high-temperature resistant masterbatch (10% SiO2 content) with a particle size of 3 mm.

[0051] Example 5:

[0052] Hydrotalcite (LDH) Masterbatch Granulation a. Pretreatment: The LDH is treated with the silane coupling agent KH-570 for surface modification and improved compatibility with EVA. It is then dried to remove moisture (LDH is hygroscopic). b. Blending and Extrusion: The modified LDH powder is premixed with EVA resin (VA content 28%) at a 5% by weight ratio. The mixture is melt-blended in a twin-screw extruder (temperature controlled: 120-150°C) at a speed of 100 rpm to prevent LDH decomposition due to high temperatures. The mixture is air-dried and granulated, and then sheared to produce a high-temperature resistant masterbatch (VA content 5%) with a particle size of 3 mm.

[0053] Example 6:

[0054] Hydrotalcite (LDH) Masterbatch Granulation a. Pretreatment: The LDH is treated with stearic acid to modify its surface and improve its compatibility with EVA. It is then dried to remove moisture (LDH is hygroscopic). b. Blending and Extrusion: The modified LDH powder is premixed with EVA resin (VA content 32%) at a 10% by weight ratio. The mixture is melt-blended in a twin-screw extruder (temperature controlled: 120-150°C) at 100 rpm to prevent LDH decomposition due to high temperatures. The mixture is air-dried and granulated, and then sheared to produce a high-temperature resistant masterbatch (VA content 10%) with a particle size of 3 mm.

[0055] Example 7:

[0056] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloxypropyltrimethoxysilane, and 4 parts of the nano-alumina masterbatch prepared in Example 1 were weighed. The above raw materials were put into a high-speed mixer (speed of 800 rpm, time 40 min) and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set at 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and rolled to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0057] Example 8:

[0058] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloxypropyltrimethoxysilane, and 4 parts of the nano-alumina masterbatch prepared in Example 2 were weighed. The above raw materials were put into a high-speed mixer (speed of 800 rpm, time 40 min) and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set at 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and rolled to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0059] Example 9:

[0060] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.4 parts of trimethylolpropane triacrylate, 0.7 parts of trimethylolpropane trimethacrylate, 0.4 parts of dibutyl hydroxytoluene, 0.5 parts of mono(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-aminopropyltriethoxysilane, and 4 parts of the nano-silica masterbatch prepared in Example 3 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0061] Example 10:

[0062] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.4 parts of trimethylolpropane triacrylate, 0.7 parts of trimethylolpropane trimethacrylate, 0.4 parts of dibutyl hydroxytoluene, 0.5 parts of mono(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-aminopropyltriethoxysilane, and 4 parts of the nano-silica masterbatch prepared in Example 4 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and rolled to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0063] Example 11:

[0064] Weigh 100 parts of EVA particles, 0.6 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of trimethylolpropane trimethacrylate, 0.7 parts of propoxylated glycerol triacrylate, 0.4 parts of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 0.5 parts of a polymer of succinic acid and (2,2,6,6-tetramethyl-4-piperidinyl) alcohol, 0.5 parts of vinyltriethoxysilane, and 4 parts of the hydrotalcite masterbatch prepared in Example 5, in parts by mass. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0065] Example 12:

[0066] Weigh 100 parts of EVA particles, 0.6 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of trimethylolpropane trimethacrylate, 0.7 parts of propoxylated glycerol triacrylate, 0.4 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 0.5 parts of a polymer of succinic acid and (2,2,6,6-tetramethyl-4-piperidinyl) alcohol, 0.5 parts of vinyltriethoxysilane, and 4 parts of the hydrotalcite masterbatch prepared in Example 6, in parts by mass. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0067] Example 13:

[0068] Weigh 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 2 parts of the nano-alumina masterbatch in Example 1, and 2 parts of the hydrotalcite masterbatch in Example 5, in parts by mass. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0069] Example 14:

[0070] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 4 parts of the nano-alumina masterbatch in Example 2, and 4 parts of the hydrotalcite masterbatch in Example 6 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0071] Example 15:

[0072] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 2 parts of the nano-silica masterbatch in Example 3, and 2 parts of the hydrotalcite masterbatch in Example 5 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0073] Example 16:

[0074] Weigh 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 3 parts of the nano-silica masterbatch in Example 4, and 3 parts of the hydrotalcite masterbatch in Example 6, in parts by mass. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0075] Example 17:

[0076] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 2 parts of the nano-alumina masterbatch in Example 1, and 2 parts of the nano-silica masterbatch in Example 3 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0077] Example 18:

[0078] Measured by mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 5 parts of the nano-alumina masterbatch in Example 2, and 5 parts of the nano-silica masterbatch in Example 4 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0079] Example 19:

[0080] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 2 parts of the nano-alumina masterbatch in Example 1, 2 parts of the nano-silica masterbatch in Example 3, and 2 parts of the hydrotalcite masterbatch in Example 5 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0081] Example 20:

[0082] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 4 parts of the nano-alumina masterbatch in Example 2, 4 parts of the nano-silica masterbatch in Example 4, and 4 parts of the hydrotalcite masterbatch in Example 6 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0083] Example 21:

[0084] By mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 6 parts of the nano-alumina masterbatch in Example 1, 4 parts of the nano-silica masterbatch in Example 3, and 2 parts of the hydrotalcite masterbatch in Example 5 were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0085] Comparative Example 1:

[0086] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of diisopropylbenzene peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 parts of γ-methacryloxypropyltrimethoxysilane were weighed. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and rolled to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0087] Comparative Example 2:

[0088] According to the mass ratio, 100 parts of EVA particles, 0.6 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.4 parts of trimethylolpropane triacrylate, 0.7 parts of trimethylolpropane trimethacrylate, 0.4 parts of dibutyl hydroxytoluene, 0.5 parts of mono(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and 0.5 parts of γ-aminopropyltriethoxysilane were weighed. The above raw materials were put into a high-speed mixer (speed of 800 rpm, time 40 minutes) and mixed evenly. After that, the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set at 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, cooling and film formation, the film was cut by traction and rolled to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0089] Comparative Example 3:

[0090] Weigh, by mass, 100 parts of EVA particles, 0.6 parts of dicumyl peroxide, 0.4 parts of triallyl isocyanurate, 0.7 parts of ethoxylated trimethylolpropane triacrylate, 0.4 parts of bis(4-octylphenol) diphosphate, 0.5 parts of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 2 parts of ungranulated nano-alumina powder, 2 parts of nano-silica powder, and 2 parts of hydrotalcite. The above raw materials were put into a high-speed mixer (speed 800 rpm, time 40 min) in proportion and mixed evenly. Then the mixture was poured into a twin-screw extruder for blending and extrusion. The temperature range was set to 80°C (zone 1) → 110°C (zone 2) → 130°C (zone 3) → 120°C (die head). After casting, embossing, and cooling to form a film, it was traction-cut and wound to obtain an EVA encapsulation film with a thickness of 0.5 mm.

[0091] The film samples of Examples 7-21 and Comparative Examples 1-3 were tested for mechanical properties, light transmittance, peel strength, high temperature resistance, wet heat stability, and high temperature baking. The lamination process was a 145°C vacuum press for 6 minutes and a lamination press for 10 minutes.

[0092] The above EVA packaging film is used to prepare photovoltaic modules.

[0093] The specific test results are shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] Specifically, test results indicate that the high-temperature-resistant, highly weather-resistant EVA film prepared by the present invention substantially meets the film requirements of solar photovoltaic modules. The EVA film prepared by the present invention exhibits clear high-temperature resistance and high weather resistance performance indicators. After the raw materials are granulated, the addition of the high-temperature-resistant masterbatch to the hydrotalcite masterbatch and two other masterbatches, in conjunction with the other two masterbatches, results in the encapsulating film exhibiting both high-temperature resistance and excellent weather resistance. After aging at 85°C for 1000 hours, the film exhibits good tensile properties (GB / T 528-2009) and maintains a light transmittance of ≥90% (GB / T 2410-2008). Crosslinking degree: ≥85% (xylene extraction method); wet heat stability: yellowing index ΔYI: <2 (ASTM E313) after 1000 hours at 85°C / 85% RH; and a bubble-free appearance after high-temperature baking. Comparative Examples 1 and 2 demonstrate that, compared to conventional EVA, the high-temperature-resistant and highly weather-resistant EVA film exhibits a yellowing index ΔYI < 2 after wet-heat aging at 150°C for 1000 hours, exhibiting a good appearance and no bubbles. Comparative Example 3 demonstrates that high-temperature-resistant and highly weather-resistant films cannot be achieved without specialized granulation methods. Furthermore, the synthesis method is simple and suitable for large-scale production.

[0098] In summary, the present high-temperature resistant and highly weather-resistant EVA encapsulation film for photovoltaic modules and its preparation method improve the compatibility with EVA particles by pre-dispersing the nano-high-temperature resistant filler after surface modification to avoid agglomeration. Subsequently, different types of high-temperature resistant fillers are subjected to differentiated extrusion granulation, which not only avoids resin degradation but also avoids structural decomposition of the filler. The cross-linking degree of the film is improved during the extrusion of the high-temperature resistant masterbatch and EVA resin, and the synergistic effect of hydrotalcite and SiO2 / Al2O3 is used to form physical cross-linking points, thereby achieving long-term weather resistance and high-temperature resistance of the EVA encapsulation film.

[0099] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A method for preparing an EVA encapsulation film, characterized in that: include: Alumina masterbatch granulation: nano-alumina is modified with a titanate coupling agent or polyethylene glycol, and then pre-mixed with liquid paraffin in a mass ratio of 20-40:60-80, and then blended with EVA particles, extruded at 130-160°C, air-dried and granulated, and sheared to prepare alumina masterbatch; and / or, silica masterbatch granulation: nano-silica surface is hydrophobized, and pre-mixed with EVA particles in a mass ratio of 10-20:80-90, and then blended with EVA particles, extruded at a low temperature of 100-130°C, air-dried and granulated, and sheared to prepare silica masterbatch; and, The hydrotalcite masterbatch is granulated by modifying nano-hydrotalcite with a silane coupling agent or stearic acid, then drying it, pre-mixing it with EVA particles at a mass ratio of 10-30:70-90, then blending it with the EVA particles, extruding it at 120-150° C., air-drying it, granulating it, and shearing it to prepare the hydrotalcite masterbatch; The EVA particles are mixed evenly with the high temperature resistant masterbatch and the additives, extruded and kneaded at 110-120°C, and then cast, embossed and cooled to obtain the EVA encapsulation film; Wherein, the high temperature resistant masterbatch comprises hydrotalcite masterbatch and alumina masterbatch and / or silica masterbatch.

2. The preparation method according to claim 1, wherein The content of nano-alumina in the alumina masterbatch is 5-10%, and the particle size is 3-5 mm; The content of nano-silicon dioxide in the silicon dioxide masterbatch is 5-10%, and the particle size is 3-5 mm; The content of nano-hydrotalcite in the hydrotalcite masterbatch is 5-10%, and the particle size is 3-5 mm.

3. The preparation method according to claim 1, wherein The mass fractions of the components of the uniform mixing of EVA particles, high temperature resistant masterbatch and additives are as follows: 100 parts of EVA particles; 1 to 10 parts of high temperature resistant masterbatch; and The auxiliary agent includes the following parts by mass: 0.4-0.8 parts of crosslinking agent, 0.4-0.8 parts of auxiliary crosslinking agent, 0.7-1 parts of UV curing agent, 0.4-1 parts of antioxidant, 0.1-1 parts of light stabilizer, and 0.2-0.8 parts of silane coupling agent.

4. The preparation method according to claim 1, wherein The EVA particles have a VA content of 5% to 40%, a melt index of 0.1 to 40 g / 10 min at 120° C., a melting point of 50 to 90° C., and a light transmittance of not less than 90%.

5. The preparation method according to claim 1, wherein The cross-linking agent includes at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, 2,5-dimethyl-2,5-bis (tert-butyl peroxy) hexane, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxybenzoate, benzoyl peroxide, and dicumyl peroxide; The auxiliary cross-linking agent includes at least one of triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, γ-(methacryloyloxy)propyltrimethoxysilane, and N,N′-m-phenylbismaleimide.

6. The preparation method according to claim 1, wherein The UV curing agent includes at least one of ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, and neopentyl glycol polymethyl ethylene oxide diacrylate.

7. The preparation method according to claim 1, wherein The antioxidant includes at least one of bis(4-octylphenol) diphosphate, dibutylhydroxytoluene, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and tris[2,4-di-tert-butylphenyl]phosphite; The light stabilizer includes at least one of a hindered amine light stabilizer, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, mono(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and a polymer of succinic acid and (2,2,6,6-tetramethyl-4-piperidinyl) alcohol.

8. The preparation method according to claim 1, wherein The silane coupling agent includes at least one of γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyl tert-butyltriperoxide silane, vinyltriacetoxysilane or vinyltris(β-methoxyethoxy)silane.

9. An EVA encapsulation film, characterized in that: Included by mass: 100 parts of EVA particles; 1 to 10 parts of high temperature resistant masterbatch; and The auxiliary agent includes the following parts by mass: Cross-linking agent 0.4-0.8 parts, auxiliary cross-linking agent 0.4-0.8 parts, UV curing agent 0.7-1 parts, antioxidant 0.4-1 parts, light stabilizer 0.1-1 parts, silane coupling agent 0.2-0.8 parts; Furthermore, the yellowing index ΔYI of the EVA encapsulation film under the conditions of 85°C / 85%RH for 1000h is less than 2; The yellowing index ΔYI of the EVA encapsulation film at 150° C. for 1000 h is less than 2.

10. A photovoltaic module, characterized in that: The invention comprises the EVA packaging film as claimed in claim 9.

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