What exactly is the composition of eva film?
EVA film is a type of polymer that goes by its full name and is sometimes referred to as tpu hot melt adhesive film hot melt film. The ethylene-vinyl acetate copolymer known as eva is the primary component of the product. It makes no difference if you are unable to recall these terms; all that matters is that you keep in mind how it appears and that you are aware that it is called tpu hot melt adhesive film hot melt adhesive film.
As a result of its low composite temperature, good light transmission, and membership in the low temperature bonding hot melt adhesive film category, eva adhesive film is widely utilized in photovoltaic panels, glass crafts, and a variety of other industries. However, when compared to pa hot melt film, pes hot melt film, and tpu hot melt film, the resistance of eva film to water and dry cleaning is significantly lower. As a result, the use of hot melt film of the tpu hot melt adhesive film type is not recommended for products and materials that have pertinent requirements for being resistant to water or dry cleaning.
eva hot melt retina is the name of a new product that has become popular in the composite market as a result of an improvement in the technology used to process hot melt adhesive. This product has the potential to compete with eva film and has gained popularity as a result of the upgrade.
In the photovoltaic module, the function of the film is to act as the adhesive that holds the photovoltaic glass, the battery sheet, and the backplane together. Additionally, the film is responsible for shielding the battery sheet and isolating the air from the module. The cost of the module is responsible for 3%–4% of the total. EVA film includes traditional transparent EVA film, white EVA film, and other (such as anti-PID film, etc.) types of photovoltaic films; POE film includes crosslinked type, thermoplastic type, white, co-extrusion, and other types of photovoltaic films; and EVA film includes traditional transparent EVA film, white EVA film, and other types of photovoltaic films. The EVA photovoltaic film, which holds more than 80 percent of the market share, is deserving of its place among the mainstream products.
EVA resin, crosslinking agent, silane coupling agent, and various other modifiers are the components that make up the raw materials for EVA photovoltaic film. After thoroughly combining the ingredients in the mixer, the mixture was transferred to a sealed container and allowed to rest for some time. Following the removal of the mixture and its placement in the film production line, a molten film was subsequently formed by rolling it out. A number of cooling rolls are used to bring the temperature of the liquid film down, after which the roll's edge is trimmed and it is harvested. It does not have a viscous consistency and is simple to work with when the temperature is normal. When the component is laminated, the EVA is heated to a certain temperature so that it is in a molten state. This creates a bond between the layers of the component.
A good fluidity can ensure that the EVA film is tiled on the substrate, which increases the contact area with the substrate. This allows the film to rely on its own polarity and the substrate's performance of the molecular force, which results in the formation of a physical bonding point, which allows the film to achieve its bonding effect.
Coupling agent based on silane
Because photovoltaic glass is an inorganic material with a smooth surface, and photovoltaic backplane is a fluorine-containing material with a surface that is difficult to bond, EVA film typically contains silane coupling agent to modify EVA in order to increase its polarity. This is because photovoltaic glass is an inorganic material with a smooth surface. The silane coupling agent forms a covalent bond with the substrate and EVA during the process of heating and curing, along with the reaction of water. This connects the inorganic glass and the polymer EVA together like a bridge, which enables the bonding effect to be achieved. The particular principle can be stated as follows: