Ultraviolet damp-heat aging resistant master batch for photovoltaic adhesive film, EVA (Ethylene Vinyl Acetate) packaging adhesive film and preparation method of EVA packaging adhesive film

Abstract

The invention belongs to the technical field of photovoltaic packaging adhesive films, and provides an anti-ultraviolet hygrothermal aging master batch for a photovoltaic adhesive film, an EVA packaging adhesive film and a preparation method. The ultraviolet damp-heat aging resistant master batch is prepared from the following raw materials in parts by weight: 68 to 90 parts of ethylene-vinyl acetate copolymer, 1 to 15 parts of organic alkaline adhesive, 1 to 10 parts of moisture-resistant acrylate and 10 to 20 parts of hydrolysis-resistant silane, wherein the VA (vinyl acetate) content of the ethylene-vinyl acetate copolymer is 20 to 22 percent; the organic alkaline adhesive is a compound of dopamine and alkali lignin. Through compounding of the raw materials, the ultraviolet cutoff performance before and after damp-heat aging, the yellowing resistance after ultraviolet high-temperature and high-humidity aging, the moisture resistance, the stripping force after damp-heat aging, the power attenuation after damp-heat aging and other comprehensive properties of an EVA packaging adhesive film can be effectively improved; and the power stability of the photovoltaic module in ultraviolet damp-heat aging and damp-heat aging environments can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic encapsulation adhesive film, in particular to an anti-ultraviolet and heat aging master batch for photovoltaic adhesive film, an EVA encapsulation adhesive film and a preparation method. BACKGROUND

[0002] Photovoltaic adhesive film packaging is one of the methods to alleviate the stability problems of photovoltaic modules caused by outdoor environmental factors: it limits the penetration of external air oxygen and moisture by providing a barrier structure, while playing an important role in bonding the cell and photovoltaic glass and photovoltaic backboard, it also has multiple functions such as mechanical buffering and protection of photovoltaic modules, anti-humidity and heat of photovoltaic modules, and anti-ultraviolet protection of photovoltaic backboard, which plays an important role in extending the service life of photovoltaic modules. The current industry popular ultraviolet cut EVA encapsulation adhesive film, such as disclosed in CN118048113A and CN114369427A, usually relies on the addition of ultraviolet absorbers such as benzophenone and benzotriazole to provide the anti-ultraviolet performance of the ultraviolet cut EVA encapsulation adhesive film.

[0003] With the continuous improvement of the encapsulation requirements of photovoltaic modules, and the highlighting of the UVID attenuation (ultraviolet-induced attenuation) problem of HJT cells (heterojunction cells), the existing ultraviolet cut EVA encapsulation adhesive film cannot achieve good long-term anti-ultraviolet effect by relying solely on the ultraviolet shielding effect of benzophenone and benzotriazole, especially after the humidity and heat aging test or the ultraviolet and heat aging test, the performance failure phenomenon of the ultraviolet shielding effect of the existing ultraviolet cut EVA encapsulation adhesive film is inevitable. If the amount of such ultraviolet absorbers is increased, their dispersibility in the EVA encapsulation adhesive film is poor, and the adhesion of the EVA encapsulation adhesive film is reduced; in addition, the introduction of too many small molecule additives such as ultraviolet absorbers can also cause the precipitation of the additives, which can cause appearance problems such as snowflake bubbles during lamination at the downstream photovoltaic module end. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide an anti-ultraviolet and heat aging master batch for photovoltaic adhesive film, a preparation method thereof, an EVA encapsulation adhesive film and a preparation method thereof.

[0005] Based on this, the present application discloses an anti-ultraviolet and heat aging master batch for photovoltaic adhesive film, which comprises the following raw materials in parts by weight:

[0006]

[0007]

[0008] The VA content of the ethylene-vinyl acetate copolymer is 20-22%; the organic alkaline adhesive is a compound of dopamine and alkali lignin.

[0009] Preferably, the mass ratio of dopamine to alkali lignin solid powder is 2-5:1.

[0010] Preferably, the moisture-resistant acrylate is trimethylcyclohexyl acrylate (TMCHA).

[0011] Preferably, the hydrolysis-resistant silane is γ-glycidoxypropyltrimethoxysilane and / or 570 silane oligomer (which is the product of dehydration condensation after hydrolysis of coupling agent kh-570, and the condensation degree is 2-10).

[0012] Further preferably, the hydrolysis-resistant silane is a mixture of γ-glycidoxypropyltrimethoxysilane (GPTMS) and 570 silane oligomer in equal volume ratio.

[0013] The application discloses a preparation method of an anti-ultraviolet and moisture heat aging master batch for a photovoltaic adhesive film.

[0014] Step 1, the formula amount of dopamine, alkali lignin solid powder and hydrolysis-resistant silane are mixed and dispersed at 50-55 DEG C ultrasonic with high-speed stirring of 800-1200 rpm / min for 45-60 min, dried to obtain uniformly dispersed mixed powder; and the formula amount of moisture-resistant acrylate and ethylene-vinyl acetate copolymer are premixed and dried to obtain mixed particles;

[0015] Step 2, the mixed particles and mixed powder of step 1 are extruded and granulated in a molten state at 90-140 DEG C to obtain the anti-ultraviolet and moisture heat aging master batch.

[0016] Preferably, the preparation process of the alkali lignin solid powder is as follows: ethanol and water are mixed into a mixed solution in a volume ratio of 1:1, the mixed solution and alkali lignin are uniformly mixed in a mass ratio of 1:0.1, and the average cycle is carried out 10-15 times under a pressure of 700-800 Pa to obtain a nano-scale alkali lignin mixed solution with a particle size of 500-800 nm;

[0017] The nano-scale alkali lignin mixed solution is centrifuged and replaced with ethanol for 3-5 times, and the alkali lignin solid powder with uniform particle size is obtained after drying.

[0018] The application discloses an EVA packaging adhesive film, which comprises the following raw materials in parts by weight:

[0019]

[0020]

[0021] The anti-ultraviolet and moisture heat aging master batch is the anti-ultraviolet and moisture heat aging master batch for a photovoltaic adhesive film as described above.

[0022] Preferably, the ethylene-vinyl acetate copolymer is one or more of ethylene-vinyl acetate copolymer with VA content of 18-24%, ethylene-vinyl acetate copolymer with VA content of 25-28%.

[0023] Further preferably, the ethylene-vinyl acetate copolymer is ethylene-vinyl acetate copolymer with VA content of 18-24%.

[0024] Preferably, the main crosslinking agent is one or more of tert-butyl peroxy-2-ethylhexyl carbonate, dibenzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, 1,1-(bis-tert-butylperoxy)-3,3,5-trimethylcyclohexane;

[0025] The co-crosslinking agent is one or more of triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, ethoxylated trimethylolpropane triacrylate, glyceryl propoxy(4) triacrylate;

[0026] The ultraviolet absorber is one or more of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-pentylphenyl)benzotriazole, 2-(2'-hydroxy-3'-cumyl-5'-tert-octylphenyl)benzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole;

[0027] The anti-aging agent is one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid octadecyl ester, tris(2,4-di-tert-butylphenyl) phosphite, decanedioic acid di(2,2,6,6-tetramethyl-4-piperidyl) ester;

[0028] The silane coupling agent is one or more of γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-isocyanatopropyltriethoxysilane.

[0029] The application discloses a preparation method of an EVA packaging adhesive film, comprising the following steps: uniformly mixing formula amounts of ethylene-vinyl acetate copolymer, anti-ultraviolet and heat aging master batch, main crosslinking agent, co-crosslinking agent, silane coupling agent, anti-aging agent and ultraviolet absorber, and obtaining the EVA packaging adhesive film through co-extrusion casting.

[0030] The EVA encapsulating adhesive film of the present application is especially suitable for use as an EVA encapsulating adhesive film for a single-glass photovoltaic module, specifically as a back EVA encapsulating adhesive film, for encapsulating cell pieces of a single-glass photovoltaic module and bonding with a photovoltaic back sheet of the single-glass photovoltaic module; in this way, the anti-hygrothermal aging and anti-ultraviolet and hygrothermal aging performance of the EVA encapsulating adhesive film at the photovoltaic module end can be improved, which helps to improve the hygrothermal corrosion resistance of the single-glass photovoltaic module and prolong its service life.

[0031] Compared with the prior art, the present application at least includes the following beneficial effects:

[0032] In the anti-ultraviolet and hygrothermal aging master batch of the present application, (1) the phenolic hydroxyl groups on the alkali lignin molecular chain provide electrons to neutralize free radicals, thereby terminating the free radical chain reaction and playing a good shielding effect on ultraviolet light energy; moreover, the hydrophobicity of alkali lignin also reduces the water vapor transmission rate of the EVA encapsulating adhesive film and improves its ultraviolet and hygrothermal stability. (2) Dopamine has strong adhesion and can be used as an adhesive for the structure of the EVA encapsulating adhesive film, which helps to improve the encapsulating effect of the adhesive film; moreover, dopamine is an organic base and can be protonated in an acidic environment, which neutralizes the part of acetic acid decomposed from EVA, delays the acid corrosion of the EVA encapsulating adhesive film, and improves the hygrothermal aging resistance and corrosion resistance of the EVA encapsulating adhesive film; at the same time, in the EVA encapsulating adhesive film of the weak acid system, dopamine can self-polymerize to form polydopamine, which strengthens the ultraviolet absorption effect. (3) The hydrophobic acrylate (especially trimethylcyclohexyl acrylate) has high heat resistance and chemical stability, and the hydrolysis-resistant silane can enhance the interfacial adhesion; therefore, the combination of the hydrophobic acrylate and the hydrolysis-resistant silane, especially for the EVA encapsulating adhesive film used for single-glass encapsulation, can provide sufficient interfacial adhesion, reduce the delamination risk after the photovoltaic back sheet is subjected to hygrothermal aging, reduce water vapor penetration, resist hydrolysis, and ensure the power stability of the photovoltaic module in the ultraviolet and hygrothermal aging environment.

[0033] Therefore, on the basis of the ethylene-vinyl acetate copolymer with a VA content of 20-22%, the anti-ultraviolet and hygrothermal aging master batch of the present application combines dopamine, alkali lignin, hydrolysis-resistant silane (such as GPTMS and 570 silane oligomer), and hydrophobic acrylate (especially TMCHA), which can effectively improve the comprehensive performance of the EVA encapsulating adhesive film before and after hygrothermal aging, such as ultraviolet cutoff performance, yellowing resistance after ultraviolet and high-temperature and high-humidity aging, moisture resistance, peel strength after hygrothermal aging, power attenuation after hygrothermal aging, and the like, and can ensure the power stability of the photovoltaic module in the ultraviolet and hygrothermal aging environment. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with specific embodiments.

[0035] Example 1

[0036] The anti-ultraviolet and damp heat aging master batch of the present embodiment comprises the following raw materials: ethylene-vinyl acetate copolymer particles (EVA particles with VA content of 22%), dopamine, alkali lignin, γ-glycidoxypropyltrimethoxysilane (GPTMS), trimethylcyclohexyl acrylate (TMCHA).

[0037] The anti-ultraviolet and damp heat aging master batch of the present embodiment comprises the following raw materials: ethylene-vinyl acetate copolymer particles (EVA particles with VA content of 22%), dopamine, alkali lignin, γ-glycidoxypropyltrimethoxysilane (GPTMS), trimethylcyclohexyl acrylate (TMCHA).

[0038] S1: Mix ethanol and water in a volume ratio of 1:1 to form a mixed solution, and mix the mixed solution with alkali lignin in a mass ratio of 1:0.1, and perform mean cycle for 10 times under a pressure of 750 Pa to obtain a nano-sized alkali lignin mixed solution with a particle size of 500-800 nm.

[0039] S2: Centrifugal replace the nano-sized alkali lignin mixed solution of step S1 with ethanol for 3 times, and dry to obtain alkali lignin solid powder with uniform particle size.

[0040] S3: Mix dopamine, alkali lignin solid powder and GPTMS in a mass ratio of 2:0.5:3, and disperse at 800 rpm / min high speed stirring in ultrasonic at 50℃ for 60 min, and dry at 100℃ to obtain uniformly dispersed mixed powder.

[0041] S4: Pre-mix TMCHA and EVA particles with VA content of 22% in a mass ratio of 1.5:100, and dry at 60℃ to obtain mixed particles.

[0042] S5: Extrude and granulate the 70 parts of mixed particles of step S4 and the 30 parts of mixed powder of step S3 in a melt state at 120℃ by double screw extrusion to obtain the anti-ultraviolet and damp heat aging master batch of the present embodiment.

[0043] The EVA packaging adhesive film of the present embodiment comprises the following raw materials by weight: EVA particles with VA content of 24% 20 parts, EVA particles with VA content of 28% 70 parts, the anti-ultraviolet and damp heat master batch of the present embodiment 10 parts, peroxide-2-ethylhexyl tert-butyl carbonate 0.7 parts, triallyl isocyanurate 0.4 parts, glycerol propoxy(4) triacrylate 0.6 parts, γ-methacryloyloxypropyltrimethoxysilane 0.25 parts, vinyltriethoxysilane 0.1 parts, vinyltri(β-methoxyethoxy)silane 0.1 parts, decanedioic acid di(2,2,6,6-tetramethyl-4-piperidyl) ester 0.5 parts, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole 0.1 parts, 2-hydroxy-4-n-octyloxybenzophenone 0.1 parts.

[0044] The preparation method of the EVA packaging adhesive film of the embodiment comprises the following steps: weighing the raw materials, mixing uniformly, controlling the temperature of each area of the extruder and the co-extrusion die at 90-100 DEG C, extruding through the co-extrusion die, cooling after casting, embossing, then measuring the thickness, cutting the edges, rolling, packaging and warehousing to obtain the finished product of the EVA packaging adhesive film of the embodiment.

[0045] Embodiment 2

[0046] The anti-ultraviolet and heat aging master batch and its preparation method, the EVA packaging adhesive film and its preparation method of the embodiment are all referred to the embodiment 1, and the difference between the embodiment and the embodiment 1 is that:

[0047] In the EVA packaging adhesive film of the embodiment, 90 parts of EVA particles with a VA content of 24% are used to replace 20 parts of EVA particles with a VA content of 24% and 70 parts of EVA particles with a VA content of 28% in the embodiment 1.

[0048] Embodiment 3

[0049] The anti-ultraviolet and heat aging master batch and its preparation method, the EVA packaging adhesive film and its preparation method of the embodiment are all referred to the embodiment 1, and the difference between the embodiment and the embodiment 1 is that:

[0050] In the EVA packaging adhesive film of the embodiment, 90 parts of EVA particles with a VA content of 28% are used to replace 20 parts of EVA particles with a VA content of 24% and 70 parts of EVA particles with a VA content of 28% in the embodiment 1.

[0051] Embodiment 4

[0052] The anti-ultraviolet and heat aging master batch and its preparation method, the EVA packaging adhesive film and its preparation method of the embodiment are all referred to the embodiment 1, and the difference between the embodiment and the embodiment 1 is that:

[0053] In the EVA packaging adhesive film of the embodiment, the following auxiliary cross-linking agents are used: 0.5 parts of triallyl isocyanurate, 0.3 parts of trimethylolpropane trimethacrylate and 0.3 parts of glycerol propoxy(4) triacrylate, which replace the following auxiliary cross-linking agents in the embodiment 1: triallyl isocyanurate 0.4 parts, glycerol propoxy(4) triacrylate 0.6 parts.

[0054] Embodiment 5

[0055] The anti-ultraviolet and heat aging master batch and its preparation method, the EVA packaging adhesive film and its preparation method of the embodiment are all referred to the embodiment 1, and the difference between the embodiment and the embodiment 1 is that:

[0056] The hydrolysis-resistant silane in the anti-ultraviolet and damp-heat aging master batch of the embodiment is a mixture of 570 oligomer and GPTMS in equal volume ratio, and the total mass percentage of the hydrolysis-resistant silane in the anti-ultraviolet and damp-heat aging master batch refers to that in Embodiment 1.

[0057] Embodiment 6

[0058] The anti-ultraviolet and damp-heat aging master batch and the preparation method thereof, and the EVA packaging adhesive film and the preparation method thereof of the embodiment all refer to Embodiment 1, and the difference between the embodiment and Embodiment 1 is that:

[0059] In the anti-ultraviolet and damp-heat aging master batch of the embodiment, the mass ratio of TMCHA to EVA particles with a 22% VA content is changed to 10:100, and the total mass percentage of the mixed particles in step S4 in the anti-ultraviolet and damp-heat aging master batch of the embodiment refers to that in Embodiment 1.

[0060] Comparative Example 1

[0061] The EVA packaging adhesive film and the preparation method thereof of the comparative example all refer to Embodiment 1, and the difference between the comparative example and Embodiment 1 is that:

[0062] In the EVA packaging adhesive film of the comparative example, no anti-ultraviolet and damp-heat aging master batch is added.

[0063] Comparative Example 2

[0064] The anti-ultraviolet and damp-heat aging master batch and the preparation method thereof, and the EVA packaging adhesive film and the preparation method thereof of the comparative example all refer to Embodiment 1, and the difference between the comparative example and Embodiment 1 is that:

[0065] In the anti-ultraviolet and damp-heat aging master batch of the comparative example, no alkali lignin is added.

[0066] Comparative Example 3

[0067] The anti-ultraviolet and damp-heat aging master batch and the preparation method thereof, and the EVA packaging adhesive film and the preparation method thereof of the comparative example all refer to Embodiment 1, and the difference between the comparative example and Embodiment 1 is that:

[0068] In the anti-ultraviolet and damp-heat aging master batch of the comparative example, no dopamine is added.

[0069] Comparative Example 4

[0070] The anti-ultraviolet and damp-heat aging master batch and the preparation method thereof, and the EVA packaging adhesive film and the preparation method thereof of the comparative example all refer to Embodiment 1, and the difference between the comparative example and Embodiment 1 is that:

[0071] In the anti-ultraviolet and damp-heat aging master batch of the comparative example, no TMCHA is added.

[0072] Comparative Example 5

[0073] The anti-ultraviolet and damp-heat aging master batch of the present comparative example, the preparation method thereof, the EVA packaging adhesive film and the preparation method thereof are all referred to Example 1, and the difference between Example 1 and the present comparative example is that:

[0074] In the anti-ultraviolet and damp-heat aging master batch of the present comparative example, no hydrolysis-resistant silane GPTMS is added.

[0075] Performance test

[0076] The EVA packaging adhesive films prepared in Examples 1-6 and Comparative Examples 1-5 are respectively subjected to performance test, and the test method is as follows:

[0077] (1) Light transmittance: tested according to GB / T29848-2024 "Ethylene-vinyl acetate copolymer (EVA) adhesive film for photovoltaic module encapsulation".

[0078] (2) Water vapor transmission rate: tested according to GB / T26253-2010.

[0079] (3) Ultraviolet high temperature and high humidity aging yellowing: tested according to IEC61215-2:2021, and the test conditions are: 85℃, 85% relative humidity, and the ultraviolet cumulative radiation is 60kWh / m 2 .

[0080] (4) The structure of the photovoltaic module used for DH1000 hour damp-heat power attenuation is: photovoltaic glass, conventional light-transmitting EPE adhesive film (400g / m 2 ), TOPCON cell, EVA packaging adhesive film and photovoltaic backboard; the DH (damp-heat aging) test of the photovoltaic module is carried out according to IEC61215-2:2021, and the test conditions are: 85℃, 85% relative humidity.

[0081] The test results of Examples 1-6 and Comparative Examples 1-5 are shown in Table 1 below:

[0082] Table 1

[0083]

[0084]

[0085] (1) Comparing the test data of Examples 1-6 and Comparative Example 1, it can be seen that: the EVA packaging adhesive film of Examples 1-6 of the present application, which is matched with the introduction of a specific anti-ultraviolet and damp-heat aging master batch, can improve the ultraviolet cutoff performance of the EVA packaging adhesive film and the ultraviolet cutoff performance after damp-heat aging (i.e. improve the ultraviolet cutoff performance before and after damp-heat aging), and can improve the yellowing resistance after ultraviolet high temperature and high humidity aging, and can also improve the moisture resistance and peel strength after damp-heat aging, thereby improving the power attenuation of the photovoltaic module after damp-heat aging.

[0086] (2) Comparing the test data of Example 1 with Examples 2, 3, it can be known that: as the VA content of EVA particles decreases, the UV cutoff performance of EVA encapsulation adhesive film after hygrothermal aging will be improved, the yellowing value after UV high temperature and high humidity aging will be reduced, and the peel strength after hygrothermal aging will also be improved, thereby further improving the power attenuation of photovoltaic modules after hygrothermal aging; but the moisture resistance will be improved.

[0087] (3) Comparing the test data of Example 1 with Examples 4, 5, 6, it can be known that: the compounding of auxiliary crosslinking agent in EVA encapsulation adhesive film, the compounding of hydrolysis-resistant silane in anti-UV and hygrothermal aging masterbatch, are more conducive to improving the moisture resistance of EVA encapsulation adhesive film, and are more conducive to improving the power attenuation of EVA encapsulation adhesive film after hygrothermal aging. And optimizing the mass ratio of TMCHA to 22% VA content EVA particles in the anti-UV and hygrothermal aging masterbatch is more conducive to improving the UV cutoff performance and water resistance of EVA encapsulation adhesive film.

[0088] (4) Comparing the test data of Example 1 with Comparative Examples 2-5, it can be known that: in the prepared anti-UV and hygrothermal aging masterbatch, the addition of alkali lignin solid powder has a more obvious improvement effect on the comprehensive performance of EVA encapsulation adhesive film (such as UV cutoff performance before and after hygrothermal aging, yellowing resistance after UV high temperature and high humidity aging, moisture resistance, peel strength after hygrothermal aging, power attenuation after hygrothermal aging). This is due to the conjugation and polar groups on the molecular structure of alkali lignin, which can shield UV light energy well. On the other hand, the hydrophobicity of alkali lignin solid powder also reduces the water vapor transmission rate of EVA encapsulation adhesive film, thereby improving the UV and hygrothermal stability of EVA encapsulation adhesive film. The addition of dopamine as an organic alkaline adhesive to the anti-UV and hygrothermal aging masterbatch can neutralize the partial acetic acid produced by EVA decomposition, thereby reducing the power reduction problem caused by acid corrosion. At the same time, in the EVA encapsulation adhesive film of the weak acid system, dopamine can self-polymerize to form polydopamine, thereby strengthening the UV absorption effect. The compounding of TMCHA and hydrolysis-resistant silane in the anti-UV and hygrothermal aging masterbatch can provide sufficient interfacial adhesion for EVA encapsulation adhesive film used for single-glass packaging, thereby reducing the delamination risk of photovoltaic backsheet, reducing water vapor penetration, and ensuring the power stability of photovoltaic modules in UV and hygrothermal aging environments.

[0089] Therefore, the anti-UV and hygrothermal aging masterbatch of Examples 1-6 of the present application, on the basis of the above-mentioned EVA particles, compounding dopamine, alkali lignin, hydrolysis-resistant silane such as GPTMS, and TMCHA, can effectively improve the comprehensive performance of EVA encapsulation adhesive film before and after hygrothermal aging, such as UV cutoff performance, yellowing resistance after UV high temperature and high humidity aging, moisture resistance, peel strength after hygrothermal aging, power attenuation after hygrothermal aging, and can ensure the power stability of photovoltaic modules in UV and hygrothermal aging environments.

[0090] While preferred embodiments of the application have been described, those skilled in the art will appreciate that other modifications and variations to the preferred embodiments are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

[0091] The above describes the technical solutions provided by the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. An ultraviolet and heat-humidity aging resistant master batch for photovoltaic adhesive film, characterized in that, The raw materials include the following by weight parts: Ethylene-vinyl acetate copolymer 68-90 parts; Organic alkaline binder 1-15 parts; Moisture-resistant acrylate 1-10 parts; Hydrolysis-resistant silane 10-20 parts; The VA content of the ethylene-vinyl acetate copolymer is 20-22%; the organic alkaline binder is a compound of dopamine and alkali lignin.

2. The UV and wet heat aging resistant master batch for photovoltaic adhesive film according to claim 1, characterized in that, The mass ratio of dopamine to alkali lignin solid powder is 2-5:

1. 3.The UV and wet heat aging resistant master batch for photovoltaic adhesive film according to claim 1, characterized in that, The moisture-resistant acrylate is trimethylcyclohexyl acrylate.

4. The UV and wet heat aging resistant master batch for photovoltaic adhesive film according to claim 1, characterized in that, The hydrolysis-resistant silane is γ-glycidyl ether oxypropyl trimethoxysilane and / or 570 silane oligomer.

5. The UV and wet heat aging resistant master batch for photovoltaic adhesive film according to claim 4, characterized in that, The hydrolysis-resistant silane is a mixture of γ-glycidyl ether oxypropyl trimethoxysilane and 570 silane oligomer in equal volume ratio.

6. The method for preparing the anti-UV and damp-heat aging master batch for photovoltaic adhesive film according to any one of claims 1-5, characterized in that, The method comprises the following steps: Step 1, disperse the formula amount of dopamine, alkali lignin solid powder and hydrolysis-resistant silane in ultrasonic, dry, and obtain a uniformly dispersed mixed powder; and premix the formula amount of moisture-resistant acrylate and ethylene-vinyl acetate copolymer, dry, and obtain mixed particles; Step 2, extrude the mixed particles and mixed powder of step 1 in a molten state to obtain an ultraviolet and heat aging resistant master batch.

7. An EVA encapsulant film, characterized by, The raw materials include the following by weight parts: Ethylene-vinyl acetate copolymer 85-100 parts; Main crosslinking agent 0.5-1 part; Auxiliary crosslinking agent 0.1-1.5 parts; Ultraviolet absorber 0.1-1 part; Anti-aging agent 0.1-1 part; Silane coupling agent 0.1-1 part; Ultraviolet and heat aging resistant master batch 1-10 parts; The ultraviolet and heat aging resistant master batch is the ultraviolet and heat aging resistant master batch for photovoltaic adhesive film according to any one of claims 1-5.

8. The EVA encapsulant film according to claim 7, wherein, The ethylene-vinyl acetate copolymer is one or more of ethylene-vinyl acetate copolymer with VA content of 18-24% and ethylene-vinyl acetate copolymer with VA content of 25-28%.

9. The EVA encapsulant film according to claim 8, wherein, The ethylene-vinyl acetate copolymer is ethylene-vinyl acetate copolymer with VA content of 18-24%; The main crosslinking agent is one or more of tert-butyl peroxy-2-ethylhexyl carbonate, dibenzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoyl peroxide) hexane, and 1,1-(bis-tert-butyl peroxide)-3,3,5-trimethylcyclohexane; The auxiliary crosslinking agent is one or more of triallyl isocyanurate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, ethoxylated trimethylolpropane triacrylate, and glycerol propoxy(4) triacrylate; The ultraviolet absorber is one or more of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, 2-(2'-hydroxy-3'-cumyl-5'-tert-octylphenyl)benzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole. The anti-aging agent is one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester, tris(2,4-di-tert-butylphenyl) phosphite, and decanedioic acid bis(2,2,6,6-tetramethyl-4-piperidyl) ester; The silane coupling agent is one or more of γ-glycidyl ether oxypropyl trimethoxysilane, γ-aminopropyl triethoxysilane, γ-(methacryloyloxy)propyl trimethoxysilane, vinyl triethoxysilane, vinyl tri(β-methoxyethoxy)silane, γ-methacryloyloxypropyl trimethoxysilane, γ-glycidyl ether oxypropyl methyl diethoxysilane, and γ-isocyanate propyl triethoxysilane.

10. A method for preparing an EVA encapsulating film according to any one of claims 7-9, characterized in that, The method comprises: uniformly mixing a formula amount of ethylene-vinyl acetate copolymer, an anti-UV and heat aging master batch, a main crosslinking agent, a co-crosslinking agent, a silane coupling agent, an anti-aging agent, and a UV absorber, and co-extrusion casting to obtain an EVA packaging adhesive film.

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