A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000

Abstract

The present invention relates to the technical field of photovoltaic encapsulation films, and specifically discloses a corrosion-resistant photovoltaic film for meeting the DH2000 encapsulation requirements of single-glass modules. The film comprises a front EPE film for encapsulating single-glass module cells and bonding to the front glass of the single-glass module, and a back EVA film for encapsulating single-glass module cells and bonding to the back panel of the single-glass module. The present invention introduces two inorganic substances of different particle sizes, magnesium hydroxide, montmorillonite nanosheets, an anti-hydrolysis agent, and a polyamide acrylic resin into an ethylene-vinyl acetate copolymer in the form of a masterbatch, thereby achieving acid neutralization, hydrolysis resistance, and local heat dissipation of the EVA film. The EPE corrosion-resistant film is combined with the EVA high-cutoff corrosion-resistant film to provide a solid foundation for the reliability of single-glass module encapsulation.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic encapsulation films, and specifically discloses a corrosion-resistant photovoltaic film for meeting the encapsulation requirements of single-glass modules DH2000. Background Art

[0002] With the rapid development of the photovoltaic industry, n-type TOPCon single-glass modules have certain market advantages. Compared to double-glass modules, single-glass modules are lightweight, suitable for distributed photovoltaics, have good hail resistance on the front, and are suitable for different layouts. At the same time, their light weight also makes them easier to transport, install, and operate. However, n-type TOPCon single-glass modules have failure modes. After DH1000 / PCT damp heat aging, the EL power attenuation exceeds 5%, the cell grid lines corrode, and obvious blackening failure occurs. In fact, the poor corrosion resistance of the cell paste is the main cause of the damp heat failure of n-type TOPCon single-glass modules. On the one hand, the acid corrosion resistance of the cell and paste can be improved; on the other hand, the acid resistance and barrier properties of the encapsulation film need to be strengthened, and a low water permeability backsheet needs to be developed.

[0003] To address this problem, the industry's current mass-produced solutions primarily rely on POE film and EP co-extruded film, such as corrosion-resistant POE paired with white EVA, corrosion-resistant POE + POE, acid-resistant EPE + acid-resistant EPE, and acid-resistant EPE + acid-resistant white EVA. However, pure POE film is more expensive than EPE or EVA, and white EVA film is more expensive than high-transmittance EVA. Therefore, while improving the reliability of single-glass packaging, reducing packaging costs is an urgent issue. Addressing the reliability of single-glass packaging from the film side involves improving the film's resistance to moisture and heat corrosion, such as increasing the degree of cross-linking, increasing the cross-linking density, and improving the adhesion between the film and the glass / backplane. In particular, adhesion after aging plays a crucial role in component stability.

[0004] Currently, the industry's most widely used solutions often rely on inorganic powders, such as magnesium hydroxide, magnesium oxide, and calcium oxide, in the hope of neutralizing the acidic substances produced by aging EPE / EVA films. In reality, while inorganics neutralize the film's acidic substances, they also accelerate film aging. The moisture generated by neutralization accelerates the rapid hydrolysis of the silane components in the film, leading to a significant decrease in the adhesion between the film and the backsheet / glass, resulting in delamination at the module end and accelerating module failure. Furthermore, the neutralizing effect of inorganics is limited, and inorganics tend to disperse unevenly, affecting the film's light transmittance, reducing the module's light absorption, and affecting the cell's photovoltaic conversion efficiency.

[0005] Based on this, the present invention proposes a corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a corrosion-resistant photovoltaic adhesive film that meets the packaging requirements of single-glass modules DH2000.

[0007] In the first aspect, the present invention discloses a corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules, specifically a front EPE film for encapsulating single-glass module cells and bonding to the front glass of the single-glass module, using the following technical solutions:

[0008] A method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements for single-glass modules includes a front EPE film for encapsulating single-glass module cells and bonding to the front glass of the single-glass module. The front EPE film is a three-layer co-extruded film comprising, from top to bottom, an EVA layer, a POE layer, and an EVA layer, and comprises the following components, calculated by weight:

[0009] EVA layer: 85-100 parts of ethylene-vinyl acetate copolymer, 0.1-1.0 parts of primary cross-linking agent, 0.1-1.0 parts of auxiliary cross-linking agent, 0.1-1.0 parts of anti-aging agent, 0.1-1.0 parts of silane coupling agent, 1.0-10 parts of anti-heat and humidity masterbatch A, 1.0-10 parts of anti-heat and humidity masterbatch B, and the mass ratio of anti-heat and humidity masterbatch A:anti-heat and humidity masterbatch B is 1-3;

[0010] POE layer: 85-100 parts of ethylene-octene copolymer, 0.1-1.0 parts of main cross-linking agent, 0.1-1.0 parts of auxiliary cross-linking agent, 0.1-1.0 parts of anti-aging agent, and 0.1-0.5 parts of silane coupling agent.

[0011] In a second aspect, the present invention discloses a corrosion-resistant photovoltaic adhesive film for meeting the DH2000 packaging requirements of single-glass modules, specifically an EVA adhesive film for encapsulating single-glass module cells and bonding to the backsheet of the single-glass module, using the following technical solutions:

[0012] A method for preparing a corrosion-resistant photovoltaic adhesive film that meets the DH2000 packaging requirements of a single-glass module, comprising an EVA adhesive film for encapsulating single-glass module cells and bonding to the back sheet of the single-glass module, comprising the following components by weight:

[0013] 85-100 parts of ethylene-vinyl acetate copolymer, 0.1-1.0 parts of a primary cross-linking agent, 0.1-1.0 parts of an auxiliary cross-linking agent, 0.1-1.0 parts of an anti-aging agent, 0.1-1.0 parts of a silane coupling agent, 1.0-10 parts of a moisture-resistant masterbatch A, 1.0-10 parts of a moisture-resistant masterbatch B, and a mass ratio of the moisture-resistant masterbatch A to the moisture-resistant masterbatch B of 1-3.

[0014] Preferably, the moisture and heat resistant masterbatch A comprises a first inorganic substance, a second inorganic substance, and ethylene-vinyl acetate copolymer. The particle size of the first inorganic substance is micron-level, and the particle size of the second inorganic substance is nanometer-level.

[0015] Preferably, the moisture and heat resistant masterbatch A comprises the following components in parts by mass:

[0016] 1-15 parts of magnesium hydroxide powder, 1-15 parts of montmorillonite powder, and 75-100 parts of ethylene-vinyl acetate copolymer; the particle size of the magnesium hydroxide powder is 1-10 μm, and the particle size of the montmorillonite powder is 500-800 nm.

[0017] Preferably, the anti-heat and humidity masterbatch B comprises the following components in parts by mass:

[0018] 1-10 parts of anti-hydrolysis agent, 1-10 parts of polyamide resin, 80-100 parts of ethylene-octene copolymer.

[0019] Preferably, the anti-hydrolysis agent is carbodiimide, and the polyamide resin is specifically a cationic thermosetting resin.

[0020] Preferably, the coupling agent A includes one or more of γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and acrylatepropyltrimethoxysilane.

[0021] Preferably, the coupling agent B includes one or more of vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane, γ-glycidoxypropylmethyldiethoxysilane, γ-propyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-isocyanatepropyltriethoxysilane.

[0022] Preferably, the silane coupling agent includes coupling agent A and coupling agent B; the molecular structure of the coupling agent A includes multiple methoxy groups, and the molecular structure of the coupling agent B includes multiple ethoxy groups.

[0023] Preferably, in the EVA layer of the front EPE film, the ratio of coupling agent A to coupling agent B is 1-3.

[0024] Preferably, in the back EVA film, the ratio of coupling agent A to coupling agent B is 0.5-2.

[0025] Preferably, the primary cross-linking agent includes one or more of tert-butyl peroxy-2-ethylhexyl carbonate, dibenzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, and 1,1-(tert-butyl diperoxy)-3,3,5-trimethylcyclohexane.

[0026] Preferably, the auxiliary cross-linking agent includes one or more of triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, ethoxylated trimethylolpropane triacrylate, and glycerol propoxy (4) triacrylate.

[0027] Preferably, the anti-aging agent includes one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, and di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0028] In a third aspect, the present invention discloses a method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module, specifically a method for preparing a front EPE film for encapsulating single-glass module cells and bonding to the front glass of the single-glass module, using the following technical solution:

[0029] A method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module, wherein the preparation method of the front EPE film is as follows:

[0030] (1) Measure ethylene-vinyl acetate copolymer, anti-heat and humidity masterbatch A, anti-heat and humidity masterbatch B, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent according to the mass ratio, and mix them evenly to obtain EVA layer material;

[0031] (2) ethylene-octene copolymer, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent are measured in mass ratio and mixed evenly to obtain POE layer material;

[0032] (3) The EVA layer material and the POE layer material are extruded through a three-layer co-extrusion casting machine to obtain an EVA-POE-EVA three-layer co-extruded EPE finished film.

[0033] In a fourth aspect, the present invention discloses a method for preparing a corrosion-resistant photovoltaic adhesive film that meets the DH2000 packaging requirements of a single-glass module, specifically a method for preparing a back EVA adhesive film for encapsulating single-glass module cells and bonding to the backsheet of the single-glass module, using the following technical solution:

[0034] A method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module, wherein the method for preparing the back EVA film is as follows:

[0035] Ethylene-vinyl acetate copolymer, anti-heat and moisture masterbatch A, anti-heat and moisture masterbatch B, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent are measured according to mass ratio and evenly mixed to obtain EVA film material; the EVA film material is extruded through a co-extrusion casting machine to obtain a back EVA film.

[0036] The preparation method of the moisture and heat resistant masterbatch A is as follows:

[0037] S1: Disperse appropriate amounts of the first inorganic substance and the second inorganic substance in titanate silane and perform ultrasonic dispersion for 30 to 60 minutes;

[0038] S2: The suspension after ultrasonication was subjected to high-speed centrifugation and the solvent was replaced with ethanol three times at a centrifugal speed of 6000-10000 r / min, with each centrifugation time of 6-10 min;

[0039] S3: Pour off the supernatant after replacement and dry the precipitate in an oven at 60°C for 10-12 hours;

[0040] S4: Grind the dried powder obtained in S3 using a ball mill until it is dispersed into a uniform powder. Grind the first inorganic powder to a particle size of 1-10 μm, and grind the second inorganic powder to a particle size of 500-800 nm.

[0041] S5: Ethylene-vinyl acetate copolymer, the first inorganic powder obtained in S4, and the second inorganic powder are measured according to the mass ratio, mixed, and granulated by a twin-screw extruder at 120-140° C. in a molten state to obtain a moisture-heat resistant masterbatch A.

[0042] The preparation method of the moisture and heat resistant masterbatch B is as follows:

[0043] Ethylene-octene copolymer, anti-hydrolysis agent and polyamide resin are measured according to the mass ratio, mixed and granulated by twin-screw extruder in a molten state at 90-120° C. to obtain moisture and heat resistant masterbatch B.

[0044] Compared with the prior art, the present invention has at least the following beneficial effects:

[0045] (1) The present invention provides a corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules. The film adopts a packaging combination of EPE and EVA films. The front film bonded to the front glass adopts an acid-resistant EPE high-transmittance film that is resistant to moisture and heat corrosion. While ensuring the anti-PID performance, it enhances the moisture and heat aging resistance of the EVA layer. At the same time, a coupling agent is used to enhance the interfacial adhesion, avoid the risk of delamination after DH aging, and reduce EL attenuation. The back film bonded to the back sheet adopts an acid-resistant EVA high-cutoff film that is resistant to moisture and heat corrosion. On the basis of effectively blocking ultraviolet rays, thanks to the introduction of two silanes in a specific ratio, the initial adhesion between the film and the back sheet is met. After aging, it still maintains a high bonding strength, avoiding the risk of delamination of the back sheet after aging. The EPE corrosion-resistant film combined with the EVA high-cutoff corrosion-resistant film provides a solid foundation for the reliability of single-glass module packaging.

[0046] (2) The present invention provides a method of introducing two inorganic substances of different particle sizes, magnesium hydroxide, montmorillonite nanosheets, anti-hydrolysis agent and polyamide acrylic resin into ethylene-vinyl acetate copolymer (EVA) in the form of a masterbatch. By adjusting the ratio of the two inorganic substances, the acid neutralization, hydrolysis resistance and local heat dissipation problems of the EVA film are achieved. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with specific embodiments.

[0048] Example 1

[0049] A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000 is prepared by the following method:

[0050] S1. Preparation of moisture and heat resistant masterbatch A:

[0051] S1.1: Disperse appropriate amounts of magnesium hydroxide and montmorillonite in titanate silane and perform ultrasonic dispersion for 45 minutes.

[0052] S1.2: After sonication, the suspension was centrifuged at high speed and the solvent was replaced with ethanol three times at a speed of 8000 rpm for 8 minutes each time.

[0053] S1.3: Pour off the supernatant and dry the precipitate in an oven at 60°C for 12 h.

[0054] S1.4: Grind the dried powder from S3 using a ball mill until it is dispersed into a uniform powder. Grind the magnesium hydroxide powder to a particle size of 1-10 μm and the montmorillonite powder to a particle size of 500-800 nm.

[0055] S1.5: Take 90 parts by mass of ethylene-vinyl acetate copolymer with a VA content of 24% (hereinafter referred to as EVA particles) as a carrier, take 8 parts each of the magnesium hydroxide powder and montmorillonite powder obtained in S1.4, mix them, and then granulate them in a twin-screw extruder in a molten state at 120°C to obtain moisture and heat resistant masterbatch A.

[0056] S2. Preparation of moisture and heat resistant masterbatch B:

[0057] 90 parts by mass of ethylene-octene (hereinafter referred to as POE particles) with a melt index of 14 g / min was taken as a carrier, 5 parts of carbodiimide and 5 parts of polyamide epichlorohydrin resin were taken, and the mixture was molten at 120°C and granulated by a twin-screw extruder to obtain heat and moisture resistant masterbatch B.

[0058] S3. Preparation of front EPE film:

[0059] S3.1: 100 parts of EVA particles, 2.0 parts of the above-obtained heat and humidity resistant masterbatch A, 1.0 part of the heat and humidity resistant masterbatch B, 0.8 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.3 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyl triethoxysilane, 0.1 parts of vinyl tris(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate were weighed and mixed uniformly to obtain an EVA layer material;

[0060] S3.2: 50 parts each of POE particles with a melt index of 4 g / 10 min and 14 g / 10 min, 1.0 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triallyl isocyanurate, 0.2 part of γ-methacryloxypropyltrimethoxysilane, 0.6 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 part of glyceryl propoxy (4) triacrylate were weighed and mixed uniformly to obtain a POE layer material;

[0061] S3.3, the temperature of each area of ​​the three-layer co-extrusion casting machine and the co-extrusion die is controlled at 80~90℃, and the film is extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, rolled, packaged and stored to obtain the EVA-POE-EVA three-layer co-extruded EPE finished film with a gram weight of 400g / m 2 , the thickness ratio of EVA layer, POE layer and EVA layer is 0.8:1:0.8.

[0062] S4. Preparation of back EVA film:

[0063] 100 parts of EVA particles were measured by mass ratio, 2.0 parts of the masterbatch A obtained above, 1.0 part of the masterbatch B, 0.8 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.2 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyltriethoxysilane, 0.1 parts of vinyltri(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and mixed evenly. The temperature of each area of ​​the extruder and the co-extrusion die was controlled at 80-90°C. The film was extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, wound, packaged, and put into storage to obtain an EVA finished film with a gram weight of 400 g / m 2 .

[0064] S5. The EPE film prepared in S3 is used to encapsulate the battery cells of the single-glass component and bonded to the front glass. The EVA film prepared in S4 is used to encapsulate the battery cells of the single-glass component and bonded to the back panel.

[0065] Example 2

[0066] A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000 is prepared by the following method:

[0067] S1. Preparation of moisture and heat resistant masterbatch A:

[0068] S1.1: Disperse appropriate amounts of magnesium hydroxide and montmorillonite in titanate silane and perform ultrasonic dispersion for 45 minutes.

[0069] S1.2: After sonication, the suspension was centrifuged at high speed and the solvent was replaced with ethanol three times at a speed of 8000 rpm for 8 minutes each time.

[0070] S1.3: Pour off the supernatant and dry the precipitate in an oven at 60°C for 12 h.

[0071] S1.4: Grind the dried powder from S3 using a ball mill until it is dispersed into a uniform powder. Grind the magnesium hydroxide powder to a particle size of 1-10 μm and the montmorillonite powder to a particle size of 500-800 nm.

[0072] S1.5: Take 90 parts of EVA particles with a VA content of 24% as a carrier, take 8.0 parts of magnesium hydroxide powder and montmorillonite powder obtained in S1.4, mix them, and then granulate them in a twin-screw extruder in a molten state at 120°C to obtain moisture and heat resistant masterbatch A.

[0073] S2. Preparation of moisture and heat resistant masterbatch B:

[0074] 90 parts by mass of POE particles with a melt index of 14 g / min were taken as a carrier, 5 parts of carbodiimide and 5 parts of polyamide epichlorohydrin resin were taken, and the mixture was granulated by a twin-screw extruder at 120° C. in a molten state to obtain heat and humidity resistant masterbatch B.

[0075] S3. Preparation of front EPE film:

[0076] S3.1: 100 parts of EVA particles, 2.0 parts of the above-prepared heat and humidity resistant masterbatch A, 2.0 parts of the heat and humidity resistant masterbatch B, 0.8 parts of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.3 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyl triethoxysilane, 0.1 parts of vinyl tris(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate were weighed and mixed uniformly to obtain an EVA layer;

[0077] S3.2: 50 parts each of POE particles with a melt index of 4 g / 10 min and 14 g / 10 min, 1.0 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triallyl isocyanurate, 0.2 part of γ-methacryloxypropyltrimethoxysilane, 0.6 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 part of glyceryl propoxy (4) triacrylate were weighed and mixed uniformly to obtain a POE layer;

[0078] S3.3, the temperature of each area of ​​the three-layer co-extrusion casting machine and the co-extrusion die is controlled at 80~90℃, and the film is extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, rolled, packaged and stored to obtain the EVA-POE-EVA three-layer co-extruded EPE finished film with a gram weight of 400g / m 2 , the thickness ratio of EVA layer, POE layer and EVA layer is 0.8:1:0.8.

[0079] S4. Preparation of back EVA film:

[0080] 100 parts of EVA particles were measured by mass ratio, 2.0 parts of the above-mentioned anti-heat and moisture masterbatch A, 2.0 parts of the anti-heat and moisture masterbatch B, 0.8 parts of tert-butyl peroxide-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.2 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyltriethoxysilane, 0.1 parts of vinyltri(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and mixed evenly. The temperature of each area of ​​the extruder and the co-extrusion die was controlled at 80-90°C. The film was extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, wound, packaged, and put into storage to obtain an EVA finished film with a gram weight of 400 g / m 2 .

[0081] S5. The EPE film prepared in S3 is used to encapsulate the battery cells of the single-glass component and bonded to the front glass. The EVA film prepared in S4 is used to encapsulate the battery cells of the single-glass component and bonded to the back panel.

[0082] Example 3

[0083] A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000 is prepared by the following method:

[0084] S1. Preparation of moisture and heat resistant masterbatch A:

[0085] S1.1: Disperse appropriate amounts of magnesium hydroxide and montmorillonite in titanate silane and perform ultrasonic dispersion for 45 minutes.

[0086] S1.2: After sonication, the suspension was centrifuged at high speed and the solvent was replaced with ethanol three times at a speed of 8000 rpm for 8 minutes each time.

[0087] S1.3: Pour off the supernatant and dry the precipitate in an oven at 60°C for 12 h.

[0088] S1.4: Grind the dried powder from S3 using a ball mill until it is dispersed into a uniform powder. Grind the magnesium hydroxide powder to a particle size of 1-10 μm and the montmorillonite powder to a particle size of 500-800 nm.

[0089] S1.5: Take 90 parts of EVA particles with a VA content of 24% as a carrier, take 8.0 parts of magnesium hydroxide powder and montmorillonite powder obtained in S1.4, mix them, and then granulate them in a twin-screw extruder in a molten state at 120°C to obtain moisture and heat resistant masterbatch A.

[0090] S2. Preparation of moisture and heat resistant masterbatch B:

[0091] 90 parts by mass of POE particles with a melt index of 14 g / min were taken as a carrier, 5 parts of carbodiimide and 5 parts of polyamide epichlorohydrin resin were taken, and the mixture was granulated by a twin-screw extruder at 120° C. in a molten state to obtain heat and humidity resistant masterbatch B.

[0092] S3. Preparation of front EPE film:

[0093] S3.1: 100 parts of EVA particles, 3.0 parts of the above-prepared heat and humidity resistant masterbatch A, 1.0 part of the heat and humidity resistant masterbatch B, 0.8 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 part of triallyl isocyanurate, 0.3 part of γ-methacryloxypropyltrimethoxysilane, 0.1 part of vinyl triethoxysilane, 0.1 part of vinyl tris(β-methoxyethoxy)silane, and 0.5 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate were weighed and mixed uniformly to obtain an EVA layer;

[0094] S3.2: 50 parts each of POE particles with a melt index of 4 g / 10 min and 14 g / 10 min, 1.0 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triallyl isocyanurate, 0.2 part of γ-methacryloxypropyltrimethoxysilane, 0.6 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 part of glyceryl propoxy (4) triacrylate were weighed and mixed uniformly to obtain a POE layer;

[0095] S3.3, the temperature of each area of ​​the three-layer co-extrusion casting machine and the co-extrusion die is controlled at 80~90℃, and the film is extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, rolled, packaged and stored to obtain the EVA-POE-EVA three-layer co-extruded EPE finished film with a gram weight of 400g / m 2 , the thickness ratio of EVA layer, POE layer and EVA layer is 0.8:1:0.8.

[0096] S4. Preparation of back EVA film:

[0097] 100 parts of EVA particles were measured by mass ratio, 3.0 parts of the above-mentioned anti-heat and moisture masterbatch A, 1.0 part of the anti-heat and moisture masterbatch B, 0.8 parts of tert-butyl peroxide-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.2 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyltriethoxysilane, 0.1 parts of vinyltri(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and mixed evenly. The temperature of each area of ​​the extruder and the co-extrusion die was controlled at 80-90°C. The film was extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, wound, packaged, and put into storage to obtain an EVA finished film with a gram weight of 400 g / m 2 .

[0098] S5. The EPE film prepared in S3 is used to encapsulate the battery cells of the single-glass component and bonded to the front glass. The EVA film prepared in S4 is used to encapsulate the battery cells of the single-glass component and bonded to the back panel.

[0099] Example 4

[0100] A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000 is prepared by the following method:

[0101] S1. Preparation of moisture and heat resistant masterbatch A:

[0102] S1.1: Disperse appropriate amounts of magnesium hydroxide and montmorillonite in titanate silane and perform ultrasonic dispersion for 45 minutes.

[0103] S1.2: After sonication, the suspension was centrifuged at high speed and the solvent was replaced with ethanol three times at a speed of 8000 rpm for 8 minutes each time.

[0104] S1.3: Pour off the supernatant and dry the precipitate in an oven at 60°C for 12 h.

[0105] S1.4: Grind the dried powder from S3 using a ball mill until it is dispersed into a uniform powder. Grind the magnesium hydroxide powder to a particle size of 1-10 μm and the montmorillonite powder to a particle size of 500-800 nm.

[0106] S1.5: Take 90 parts of EVA particles with a VA content of 24% as a carrier, take 8.0 parts of magnesium hydroxide powder and montmorillonite powder obtained in S1.4, mix them, and then granulate them in a twin-screw extruder in a molten state at 120°C to obtain moisture and heat resistant masterbatch A.

[0107] S2. Preparation of moisture and heat resistant masterbatch B:

[0108] 90 parts by mass of POE particles with a melt index of 14 g / min were taken as a carrier, 5 parts of carbodiimide and 5 parts of polyamide epichlorohydrin resin were taken, and the mixture was granulated by a twin-screw extruder at 120° C. in a molten state to obtain heat and humidity resistant masterbatch B.

[0109] S3. Preparation of front EPE film:

[0110] S3.1: 100 parts of EVA particles, 3.0 parts of the above-prepared heat and humidity resistant masterbatch A, 1.0 part of the heat and humidity resistant masterbatch B, 0.8 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 part of triallyl isocyanurate, 0.4 part of γ-methacryloxypropyltrimethoxysilane, 0.1 part of vinyl triethoxysilane, 0.1 part of vinyl tris(β-methoxyethoxy)silane, and 0.5 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate were weighed and mixed uniformly to obtain an EVA layer;

[0111] S3.2: 50 parts each of POE particles with a melt index of 4 g / 10 min and 14 g / 10 min, 1.0 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triallyl isocyanurate, 0.2 part of γ-methacryloxypropyltrimethoxysilane, 0.6 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 part of glyceryl propoxy (4) triacrylate were weighed and mixed uniformly to obtain a POE layer;

[0112] S3.3, the temperature of each area of ​​the three-layer co-extrusion casting machine and the co-extrusion die is controlled at 80~90℃, and the film is extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, rolled, packaged and stored to obtain the EVA-POE-EVA three-layer co-extruded EPE finished film with a gram weight of 400g / m 2 , the thickness ratio of EVA layer, POE layer and EVA layer is 0.8:1:0.8.

[0113] S4. Preparation of back EVA film:

[0114] 100 parts of EVA particles were measured by mass ratio, 3.0 parts of the above-mentioned anti-heat and moisture masterbatch A, 1.0 part of the anti-heat and moisture masterbatch B, 0.8 parts of tert-butyl peroxide-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.3 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of vinyltriethoxysilane, 0.1 parts of vinyltri(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and mixed evenly. The temperature of each area of ​​the extruder and the co-extrusion die was controlled at 80-90°C. The film was extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, wound, packaged, and put into storage to obtain an EVA finished film with a gram weight of 400 g / m 2 .

[0115] S5. The EPE film prepared in S3 is used to encapsulate the battery cells of the single-glass component and bonded to the front glass. The EVA film prepared in S4 is used to encapsulate the battery cells of the single-glass component and bonded to the back panel.

[0116] Example 5

[0117] A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000 is prepared by the following method:

[0118] S1. Preparation of moisture and heat resistant masterbatch A:

[0119] S1.1: Disperse appropriate amounts of magnesium hydroxide and montmorillonite in titanate silane and perform ultrasonic dispersion for 45 minutes.

[0120] S1.2: After sonication, the suspension was centrifuged at high speed and the solvent was replaced with ethanol three times at a speed of 8000 rpm for 8 minutes each time.

[0121] S1.3: Pour off the supernatant and dry the precipitate in an oven at 60°C for 12 h.

[0122] S1.4: Grind the dried powder from S3 using a ball mill until it is dispersed into a uniform powder. Grind the magnesium hydroxide powder to a particle size of 1-10 μm and the montmorillonite powder to a particle size of 500-800 nm.

[0123] S1.5: Take 90 parts of EVA particles with a VA content of 24% as a carrier, take 8.0 parts of magnesium hydroxide powder and montmorillonite powder obtained in S1.4, mix them, and then granulate them in a twin-screw extruder in a molten state at 120°C to obtain moisture and heat resistant masterbatch A.

[0124] S2. Preparation of moisture and heat resistant masterbatch B:

[0125] 90 parts by mass of POE particles with a melt index of 14 g / min were taken as a carrier, 5 parts of carbodiimide and 5 parts of polyamide epichlorohydrin resin were taken, and the mixture was granulated by a twin-screw extruder at 120° C. in a molten state to obtain heat and humidity resistant masterbatch B.

[0126] S3. Preparation of front EPE film:

[0127] S3.1: 100 parts of EVA particles, 3.0 parts of the above-prepared heat and humidity resistant masterbatch A, 1.0 part of the heat and humidity resistant masterbatch B, 0.8 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.6 part of triallyl isocyanurate, 0.3 part of γ-methacryloxypropyltrimethoxysilane, 0.2 part of vinyl triethoxysilane, 0.1 part of vinyl tris(β-methoxyethoxy)silane, and 0.5 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate were weighed and mixed uniformly to obtain an EVA layer;

[0128] S3.2: 50 parts each of POE particles with a melt index of 4 g / 10 min and 14 g / 10 min, 1.0 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triallyl isocyanurate, 0.2 part of γ-methacryloxypropyltrimethoxysilane, 0.6 part of di(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 0.5 part of glyceryl propoxy (4) triacrylate were weighed and mixed uniformly to obtain a POE layer;

[0129] S3.3, the temperature of each area of ​​the three-layer co-extrusion casting machine and the co-extrusion die is controlled at 80~90℃, and the film is extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, rolled, packaged and stored to obtain the EVA-POE-EVA three-layer co-extruded EPE finished film with a gram weight of 400g / m 2 , the thickness ratio of EVA layer, POE layer and EVA layer is 0.8:1:0.8.

[0130] S4. Preparation of back EVA film:

[0131] 100 parts of EVA particles were measured by mass ratio, 3.0 parts of the above-mentioned anti-heat and moisture masterbatch A, 1.0 part of the anti-heat and moisture masterbatch B, 0.8 parts of tert-butyl peroxide-2-ethylhexyl carbonate, 0.6 parts of triallyl isocyanurate, 0.2 parts of γ-methacryloxypropyltrimethoxysilane, 0.2 parts of vinyltriethoxysilane, 0.1 parts of vinyltri(β-methoxyethoxy)silane, and 0.5 parts of di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and mixed evenly. The temperature of each area of ​​the extruder and the co-extrusion die was controlled at 80-90°C. The film was extruded through the co-extrusion die, cast, cooled, embossed, and then thickness measured, trimmed, wound, packaged, and put into storage to obtain an EVA finished film with a gram weight of 400g / m2 .

[0132] S5. The EPE film prepared in S3 is used to encapsulate the battery cells of the single-glass component and bonded to the front glass. The EVA film prepared in S4 is used to encapsulate the battery cells of the single-glass component and bonded to the back panel.

[0133] Comparative Example 1

[0134] A photovoltaic adhesive film, which differs from Example 5 in that the anti-heat and moisture masterbatch B is not added to the front EPE adhesive film and the back EVA adhesive film of Comparative Example 1.

[0135] Comparative Example 2

[0136] A photovoltaic adhesive film is different from Example 5 in that the anti-heat and moisture masterbatch A is not added to the front EPE adhesive film and the back EVA adhesive film of Comparative Example 2.

[0137] Comparative Example 3

[0138] A photovoltaic adhesive film, which differs from Example 5 in that the front EPE adhesive film and the back EVA adhesive film of Comparative Example 3 do not contain the anti-heat and moisture masterbatch A and the anti-heat and moisture masterbatch B.

[0139] Comparative Example 4

[0140] A photovoltaic film, which differs from Example 5 in that the magnesium hydroxide and montmorillonite in Comparative Example 4 are not introduced into the front EPE film and the back EVA film in the form of anti-heat and moisture masterbatch A, but are directly introduced into the front EPE film and the back EVA film in the form of powder pretreated by S1.4 and with an amount equal to the solid content in the anti-heat and moisture masterbatch A in Example 5.

[0141] Comparative Example 5

[0142] A photovoltaic adhesive film, which differs from Example 5 in that the mass fractions of γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and vinyltri(β-methoxyethoxy)silane in the EVA layer of the front EPE adhesive film of Comparative Example 5 are different.

[0143] The silanes added to the EVA layer of the front EPE film are: 0.1 part γ-methacryloxypropyltrimethoxysilane, 0.2 part vinyltriethoxysilane, and 0.1 part vinyltri(β-methoxyethoxy)silane. The ratio of methoxy silane to ethoxy silane is 1:3.

[0144] Comparative Example 6

[0145] A photovoltaic adhesive film is different from Example 5 in that the mass fractions of γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and vinyltri(β-methoxyethoxy)silane in the back EVA adhesive film of Comparative Example 6 are different.

[0146] The silanes added to prepare the back EVA film are: 0.05 parts of γ-methacryloxypropyltrimethoxysilane, 0.3 parts of vinyltriethoxysilane, and 0.05 parts of vinyltri(β-methoxyethoxy)silane. The ratio of methoxy silane to ethoxy silane is 0.5:3.5.

[0147] Performance Testing

[0148] The physical properties and components of the encapsulation films prepared in Examples 1 to 5 and Comparative Examples 1 to 6 were tested respectively. The testing methods are as follows:

[0149] (1) Peel strength: The test was conducted according to the method described in GB / T 29848-2013 “Ethylene-vinyl acetate copolymer (EVA) adhesive film for photovoltaic module encapsulation”.

[0150] Module power test: 3.2mm glass / heat-resistant EPE high-transmittance adhesive film / N-type TOPcon battery / heat-resistant EVA high-cutoff adhesive film / transparent backsheet.

[0151] (2) PID power attenuation: The PID of the photovoltaic module was tested according to the industry standard IEC-62804. The test conditions were: 1500V voltage, 85°C, 85% relative humidity, and 192 hours.

[0152] (3) DH power attenuation: The DH of the photovoltaic module is tested according to the industry standard IEC-62804. The test conditions are: 85°C, 85% relative humidity, and 2000 hours.

[0153] The test results are shown in Table 1 below:

[0154] Table 1

[0155]

[0156] As can be seen from Table 1, by comparing the test data of Examples 1-5 with those of Comparative Examples 1-4, it can be concluded that the present invention is beneficial to improving the anti-wet heat aging performance of EPE and EVA films by introducing magnesium hydroxide, montmorillonite nanosheets, anti-hydrolysis agent and functional additives of polyamide acrylic resin in the form of masterbatch.

[0157] In particular, by adjusting the ratio of different types of silanes and regulating the amount of masterbatch, combined with Comparative Examples 5-6, it can be seen that the peel strength with glass after wet heat aging is controllable, reducing the risk of delamination of single-glass modules, improving the wet heat stability of large single-glass module packaging, and maintaining relatively stable module power after DH2000. By introducing two silane coupling agents in a specific ratio, the present invention can enhance the interfacial adhesion of the EVA layer to the EPE film, avoid the risk of delamination after DH aging, and reduce EL attenuation. For the EVA film, it not only meets the initial adhesion between the film and the backsheet, but also maintains a high bonding strength after aging, avoiding the risk of backsheet delamination after aging.

[0158] In addition, the present invention introduces two inorganic substances of different particle sizes, magnesium hydroxide, montmorillonite nanosheets, an anti-hydrolysis agent, and a polyamide acrylic resin, into ethylene-vinyl acetate copolymer in the form of a masterbatch. By adjusting the ratio of the two inorganic substances, the acid neutralization, hydrolysis resistance, and local heat dissipation problems of the EVA film are achieved. The magnesium hydroxide particle size is 1-10 μm, and the montmorillonite nanosheets are 500-800 nm. The use of two inorganic substances with micro-nano structures can play the following synergistic role: after pretreatment, the micron-sized magnesium hydroxide reduces the risk of agglomeration and also plays a delaying role in acid corrosion of the EVA film. At the same time, as an inorganic substance, the appropriate amount of introduction can improve the tensile strength and elongation at break of the film; nano-montmorillonite, as a layered structure, reduces and prolongs the diffusion path of water vapor in the EVA film, which can effectively reduce the water vapor transmission rate. After pretreatment, the EVA film is strengthened and toughened. Furthermore, the interlayer spacing of the montmorillonite is expanded, allowing cations between the layers to exchange ions, adsorbing sodium ions generated during film aging and reducing the risk of component failure. Inorganic materials of two particle sizes are introduced in the form of masterbatches, allowing for better control of the dispersion uniformity of the inorganic powders, controlling the masterbatch concentration, and regulating the film's light transmittance. This improves the film's tensile strength while also enhancing its resistance to wet-heat aging.

[0159] The polyamide resin of the present invention is preferably a cationic thermosetting resin. Because cationic thermosetting resins are inherently positively charged, they form electrostatic interactions with anions in the system. Furthermore, the multiple hydroxyl groups in their molecular chains can form hydrogen bonds with EVA side chains. Furthermore, they can cross-link at high temperatures, forming a water-resistant barrier within the EVA system. This reduces the decomposition and aging of the EVA due to water absorption in hot and humid environments, improving the film's resistance while minimizing debonding from the glass due to aging.

[0160] Regarding the choice of silane coupling agent, compared to existing adhesive film materials prepared using mercaptosilanes, mercaptosilanes have a strong odor and the mercapto groups on the silane groups easily form complexes with residual metal ions from additives in the adhesive film formulation and metal Ag ions on the battery surface. These complexes can easily cause snail marks on the adhesive film, affecting the film's appearance and the use of the module. This solution, however, specifically uses methoxy and ethoxy silane coupling agents in different proportions, eliminating these odor and film appearance issues.

[0161] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0162] The technical solution provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules, characterized in that: It includes a front EPE film for encapsulating single-glass module cells and bonding to the front glass of the single-glass module. The front EPE film is a three-layer co-extruded film including an EVA layer, a POE layer, and an EVA layer arranged in sequence from top to bottom, and includes the following components by weight: EVA layer: 85-100 parts of ethylene-vinyl acetate copolymer, 0.1-1.0 parts of primary cross-linking agent, 0.1-1.0 parts of auxiliary cross-linking agent, 0.1-1.0 parts of anti-aging agent, 0.1-1.0 parts of silane coupling agent, 1.0-10 parts of anti-heat and humidity masterbatch A, 1.0-10 parts of anti-heat and humidity masterbatch B, and the mass ratio of anti-heat and humidity masterbatch A:anti-heat and humidity masterbatch B is 1-3; POE layer: 85-100 parts of ethylene-octene copolymer, 0.1-1.0 parts of main cross-linking agent, 1.2 parts of auxiliary cross-linking agent, 0.1-1.0 parts of anti-aging agent, and 0.1-0.5 parts of silane coupling agent; The silane coupling agent of the EVA layer includes coupling agent A and coupling agent B; the molecular structure of coupling agent A includes multiple methoxy groups, and the molecular structure of coupling agent B includes multiple ethoxy groups; in the EVA layer of the front EPE film, the ratio of coupling agent A to coupling agent B is 1 to 3; The anti-heat and humidity masterbatch A comprises a first inorganic substance, a second inorganic substance, and ethylene-vinyl acetate copolymer, wherein the particle size of the first inorganic substance is micrometer-level, and the particle size of the second inorganic substance is nanometer-level; the first inorganic substance is magnesium hydroxide, and the second inorganic substance is montmorillonite; The anti-heat and moisture masterbatch B comprises an anti-hydrolysis agent, a polyamide resin, and an ethylene-octene copolymer.

2. A corrosion-resistant photovoltaic film for meeting the packaging requirements of single-glass modules DH2000, characterized in that: It includes the back EVA film used for encapsulating single-glass module cells and bonding to the back sheet of the single-glass module, and includes the following components by mass: 85-100 parts of ethylene-vinyl acetate copolymer, 0.1-1.0 parts of a primary cross-linking agent, 0.1-1.0 parts of an auxiliary cross-linking agent, 0.1-1.0 parts of an anti-aging agent, 0.1-1.0 parts of a silane coupling agent, 1.0-10 parts of a moisture-resistant masterbatch A, and 1.0-10 parts of a moisture-resistant masterbatch B, wherein the mass ratio of the moisture-resistant masterbatch A to the moisture-resistant masterbatch B is 1-3; The silane coupling agent of the EVA film includes coupling agent A and coupling agent B; the molecular structure of coupling agent A includes multiple methoxy groups, and the molecular structure of coupling agent B includes multiple ethoxy groups; in the back EVA film, the ratio of coupling agent A to coupling agent B is 0.5 to 2; The anti-heat and humidity masterbatch A comprises a first inorganic substance, a second inorganic substance, and ethylene-vinyl acetate copolymer, wherein the particle size of the first inorganic substance is micrometer-level, and the particle size of the second inorganic substance is nanometer-level; the first inorganic substance is magnesium hydroxide, and the second inorganic substance is montmorillonite; The anti-heat and moisture masterbatch B comprises an anti-hydrolysis agent, a polyamide resin, and an ethylene-octene copolymer.

3. The corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules according to claim 1 or 2, characterized in that: The anti-heat and humidity masterbatch A comprises the following components in parts by mass: 1-15 parts of magnesium hydroxide powder, 1-15 parts of montmorillonite powder, and 75-100 parts of ethylene-vinyl acetate copolymer; the particle size of the magnesium hydroxide powder is 1-10 μm, and the particle size of the montmorillonite powder is 500-800 nm.

4. The corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules according to claim 1 or 2, characterized in that: The anti-heat and humidity masterbatch B comprises the following components in parts by mass: 1-10 parts of anti-hydrolysis agent, 1-10 parts of polyamide resin, 80-100 parts of ethylene-octene copolymer.

5. The corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules according to claim 4, characterized in that: The anti-hydrolysis agent is carbodiimide, and the polyamide resin is specifically a cationic thermosetting resin.

6. The corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules according to claim 1 or 2, characterized in that: The coupling agent A includes one or more of γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and acrylatepropyltrimethoxysilane; The coupling agent B includes one or more of vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane, γ-glycidoxypropylmethyldiethoxysilane, γ-propyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-isocyanatepropyltriethoxysilane.

7. The corrosion-resistant photovoltaic film for meeting the DH2000 packaging requirements of single-glass modules according to claim 1 or 2, characterized in that: The main cross-linking agent includes one or more of tert-butyl peroxide-2-ethylhexyl carbonate, dibenzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, and 1,1-(tert-butyl diperoxide)-3,3,5-trimethylcyclohexane; The auxiliary cross-linking agent includes one or more of triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, ethoxylated trimethylolpropane triacrylate, and glycerol propoxy (4) triacrylate; The anti-aging agent includes one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, and di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

8. A method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module according to claim 1, characterized in that: The preparation method of the front EPE film is as follows: (1) Measure ethylene-vinyl acetate copolymer, anti-heat and humidity masterbatch A, anti-heat and humidity masterbatch B, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent according to the mass ratio, and mix them evenly to obtain EVA layer material; (2) ethylene-octene copolymer, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent are measured in mass ratio and mixed evenly to obtain POE layer material; (3) The EVA layer material and the POE layer material are cast into a film through three-layer melt co-extrusion to obtain an EVA-POE-EVA three-layer co-extruded EPE finished film.

9. A method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module as claimed in claim 2, characterized in that: The preparation method of the back EVA film is as follows: Ethylene-vinyl acetate copolymer, anti-heat and moisture masterbatch A, anti-heat and moisture masterbatch B, main cross-linking agent, auxiliary cross-linking agent, silane coupling agent, and anti-aging agent are measured according to mass ratio and evenly mixed to obtain EVA film material; the EVA film material is extruded by co-extrusion casting to obtain a back EVA film.

10. The method for preparing a corrosion-resistant photovoltaic film that meets the DH2000 packaging requirements of a single-glass module according to claim 8 or 9, characterized in that: The preparation method of the moisture and heat resistant masterbatch A is as follows: S1: Disperse appropriate amounts of the first inorganic substance and the second inorganic substance in titanate silane and perform ultrasonic dispersion for 30 to 60 minutes; S2: The suspension after ultrasonication was subjected to high-speed centrifugation and the solvent was replaced with ethanol three times at a centrifugal speed of 6000-10000 r / min, with each centrifugation time of 6-10 min; S3: Pour off the supernatant after replacement and dry the precipitate in an oven at 60°C for 10-12 hours; S4: Grind the dried powder obtained in S3 using a ball mill until it is dispersed into a uniform powder. Grind the first inorganic powder to a particle size of 1-10 μm, and grind the second inorganic powder to a particle size of 500-800 nm. S5: Ethylene-vinyl acetate copolymer, the first inorganic powder obtained in S4, and the second inorganic powder are weighed according to a mass ratio, mixed, and granulated by a twin-screw extruder in a molten state at 120-140° C. to obtain a moisture-heat resistant masterbatch A; The preparation method of the moisture and heat resistant masterbatch B is as follows: Ethylene-octene copolymer, anti-hydrolysis agent and polyamide resin are measured according to the mass ratio, mixed and granulated by twin-screw extruder in a molten state at 90-120° C. to obtain moisture and heat resistant masterbatch B.

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