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EVA adhesive film, preparation method and application thereof in photovoltaic assembly

A film and liquid technology, which is applied in the field of packaging materials for photovoltaic modules, can solve the problems of EVA film, such as reduced light transmittance and cross-linking degree, and easy conductivity.

Inactive Publication Date: 2017-07-21
浙江利昌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in order to reduce the PID of photovoltaic module, common technical means is to improve the volume resistivity of EVA adhesive film, as CN103146315A discloses a kind of volume resistivity up to 10 15 Ω.cm EVA film, including EVA resin, polyolefin elastomer, UV aging resistance additive, liquid peroxide crosslinking agent and liquid silane coupling agent, EVA molecules are polar and easy to conduct electricity, polyolefin molecules It is non-polar. The main purpose of adding polyolefin is to reduce the influence of the polarity of EVA molecules on volume resistivity, but the disadvantage of adding polyolefin will reduce the light transmittance and crosslinking degree of EVA film. Therefore, adding The amount added should not be too much, so that the adverse effects of polyolefin can be controlled in a small range

Method used

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  • EVA adhesive film, preparation method and application thereof in photovoltaic assembly
  • EVA adhesive film, preparation method and application thereof in photovoltaic assembly

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preparation example Construction

[0051] The present invention also provides the preparation method of the EVA adhesive film described in above-mentioned technical scheme, comprises the following steps:

[0052] (1) will account for total EVA resin quality 1~8% EVA resin, nano silicon dioxide and anti-ultraviolet aging auxiliary agent mix rear granulation, obtain molding particle;

[0053] (2) the molded particle that described step (1) obtains is mixed with the EVA resin of peroxide initiator, liquid silane coupling agent, liquid crosslinking agent and surplus, obtains mixed material;

[0054] (3) extrude into thin film after the mixed material melting that described step (2) obtains, obtains EVA film.

[0055] The invention mixes 1-8% of the mass content of the EVA resin, nano-silicon dioxide and an anti-ultraviolet aging additive, and then granulates to obtain shaped particles.

[0056] In the present invention, the mixing mode of described EVA resin, nano silicon dioxide and anti-ultraviolet aging additiv...

Embodiment 1

[0069] 40kg of EVA resin, 3kg of silicon dioxide with a particle size of 50nm and 2kg of benzophenone compounds are stirred and mixed in a mixer, and then granulated in a granulator to obtain shaped particles with a particle size of 2mm, and then shaped particles With peroxide 2-ethylhexyl tert-butyl carbonate 7kg, triallyl isocyanurate 6kg, 3-(methacryloyl oxygen) propyltrimethoxysilane 2kg and surplus EVA resin 940kg Mixing to obtain a mixed material, which is melted at 80°C and extruded into a film, and then processed by compression molding, pre-shrinking, edge trimming and winding packaging to obtain an EVA film.

[0070] The performance of the EVA adhesive film that present embodiment is made is measured, and the result is as shown in table 1.

[0071] The EVA resin produced in this embodiment is used for photovoltaic module encapsulation, and a PID test is carried out on the photovoltaic module. During the PID test, a reverse voltage of -1000V is input to the photovoltai...

Embodiment 2

[0073] 70kg of EVA resin, 10kg of silicon dioxide with a particle diameter of 100nm and 4kg of hindered amine compounds were stirred and mixed in a mixer, and then granulated in a granulator to obtain shaped particles with a particle diameter of 8mm, and then the shaped particles were mixed with 2, 5-dimethyl-2,5-di-tert-butylperoxyhexane 10kg, trimethylolpropane trimethacrylate 10kg, 3-(methacryloyloxy)propyltrimethoxysilane 5kg and remaining A certain amount of EVA resin 891kg is mixed to obtain a mixed material, and the mixed material is extruded into a film after being melted at 100° C., and the EVA film is obtained through compression film molding, pre-shrinkage, edge trimming and winding packaging.

[0074] The performance of the EVA adhesive film that present embodiment is made is measured, and the result is as shown in table 1.

[0075] The EVA resin produced in this embodiment is used for photovoltaic module encapsulation, and a PID test is carried out on the photovol...

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Abstract

The invention provides an EVA adhesive film, which comprises the following components by weight percent: 93.5%-98.5% of EVA resin; 0.1%-2% of nano silica; 0.1%-0.5% of an ultraviolet aging resistant additive; 0.3%-1.5% of a peroxide initiator; 0.3%-1.5% of a liquid crosslinking agent; and 0.1%-1.0% of a liquid silane coupling agent. Nano silica capable of capturing sodium ions is added into the EVA adhesive film, so that sodium ions can fall into gaps of a sodium ion capture agent during migration, at the same time nano silica also fills sodium ion migration channels, successfully prevents sodium ions from migrating to the surface of a crystalline silicon battery piece, thus endowing a photovoltaic assembly with anti-PID performance. Embodiments of the invention show that PID tests prove that the photovoltaic assembly produced with the EVA adhesive film provided by the invention has output power attenuation of not more than 3%.

Description

technical field [0001] The invention relates to the technical field of packaging materials for photovoltaic modules, in particular to an EVA adhesive film, a preparation method thereof, and an application in photovoltaic modules. Background technique [0002] Photovoltaic modules are the main equipment for solar photovoltaic power generation. When sunlight shines on photovoltaic modules, they will emit current and output current through related equipment. The structure includes tempered glass panels, EVA (ethylene-vinyl acetate copolymer) Adhesive film, crystalline silicon cell, EVA adhesive film and back sheet (TPT board). With the continuous development of photovoltaic module technology and some problems found in the use, that is, the module is under the action of high voltage for a long time, which causes leakage current between the glass and the packaging material, and a large amount of charge accumulates on the surface of the battery sheet, which makes the surface of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J123/08C09J11/04C09J11/06H01L31/048
CPCC08K3/36C08K5/103C08K5/132C08K5/5425C08K13/02C08K2201/003C08K2201/011C09J7/00C09J11/04C09J11/06C09J123/0853C09J2203/326C09J2423/04H01L31/0481Y02E10/50
Inventor 詹显光蒋祥吉金怀东周雪梅
Owner 浙江利昌科技有限公司
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