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Photovoltaic modules play a vital role in the development of our solar energy. So, what are the materials used for the encapsulation of photovoltaic modules? Let's take a look together next.
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The material used for encapsulation of crystalline silicon photovoltaic modules is EVA
Main categories of EVA
The material used for the encapsulation of crystalline silicon photovoltaic modules is EVA. The photovoltaic module EVA is a copolymer of ethylene and vinyl acetate. EVA is a thermosetting hot melt adhesive, which is non-sticky at room temperature for easy operation. After certain conditions, hot pressing Melt bonding and cross-linking will occur and become completely transparent. The long-term practice has proved that compared with other materials, EVA has achieved quite satisfactory results in both photovoltaic module packaging and outdoor use.
The thickness of EVA for the encapsulation of photovoltaic modules is between 0.4mm and 0.6mm. It requires a smooth surface and uniform thickness. It contains a crosslinking agent and can be crosslinked at a curing temperature of 150°C. The extrusion molding process is used to form a stable adhesive layer.
There are two main types of EVA materials for photovoltaic module cell encapsulation: fast curing and conventional curing.
The encapsulated material EVA for photovoltaic modules has excellent flexibility, impact resistance, elasticity, optical transparency, adhesion, environmental stress cracking resistance, weather resistance, chemical resistance, and heat sealability.
The cured EVA can withstand atmospheric changes and is elastic. It combines the crystalline silicon photovoltaic module with the upper cover and the lower pad, and the upper protective material glass and the lower protective material TPT are bonded together by vacuum lamination technology.
On the other hand, the encapsulated material of the photovoltaic module cell and the glass can increase the light transmittance of the glass, play a role in anti-reflection, and have again an effect on the output of the photovoltaic module.
Different temperatures have a relatively large impact on the degree of crosslinking of EVA, and the degree of crosslinking of EVA directly affects the performance and service life of photovoltaic modules. In the molten state, EVA bonds with crystalline silicon solar cells, glass, and TPT. In this process, there are both physical and chemical bonds. When EVA is heated to a certain temperature, the cross-linking agent decomposes to generate free radicals, which initiates the combination of EVA molecules to form a three-dimensional network structure, resulting in the cross-linking and curing of the EVA adhesive layer of the photovoltaic module battery encapsulation material. When the degree of crosslinking reaches More than 60% can withstand changes in the environment, so encapsulating photovoltaic modules with EVA, the material encapsulated by photovoltaic modules, can achieve a long service life. In the actual production process, the cross-linking degree of EVA, the material encapsulated by photovoltaic modules, is generally controlled between 85% and 95%.
The manufacturer of Anhui JF Solar Technology Co., Ltd. (JF Solar)
JF Solar is a high-end solar photovoltaic module manufacturer with the most advanced equipment, technology, and quality in the world. The experiment is very concerned about the material quality of the encapsulation of photovoltaic modules. If you are interested in photovoltaic modules, please contact us. Our website is https://www.jf-solartech.com/.
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