In the mid-19th century, the French scientist Becquerel found that the light semiconductor can make a potential difference between its different parts, which is called the "photovoltaic effect", referred to as the "photovoltaic effect". In the middle of the 20th century, American scientists Chabin and Pierson carried out experimental research on monocrystalline silicon solar cells, and successfully developed practical monocrystalline silicon solar cells, since then, the birth of photovoltaic power generation technology of light energy conversion to electricity. The single solar cells are strung and connected to form photovoltaic modules, the core of which is the solar cell sheet. The upper and lower solar cells are protected by the tempered glass layer and the photovoltaic backplane layer, and between the battery and the glass layer and between the battery and the backplane layer, it is called the photovoltaic film. The photovoltaic film plays a role in packaging and protecting the solar cell module, extending the service life of the module, therefore, the quality of the photovoltaic film determines the quality and life of the module. There are three kinds of photovoltaic film, respectively, ethylene - vinyl acetate copolymer (EVA), POE and EPE (EVA+POE mixture), EVA has become the most important film material because of its excellent performance and cheap price.
EVA (Ethylene VinylAcetate Copolymer) is a copolymer of ethylene and vinyl acetate (VA). According to the different VA content, EVA products are roughly divided into three categories: ①EVA resin: VA content 5% ~ 40%, transparent particles, mainly used for polyethylene modification, manufacturing wire and cable materials, films and other molding products. EVA elastomer: VA content 40% ~ 70%, mainly used as rubber elastomer and PVC (polyvinyl chloride) modifier. ③EVA emulsion: VA content 70% ~ 95%, mainly used as adhesives and coatings, coatings. The main raw material of photovoltaic film is EVA photovoltaic material, VA content is generally 28%-33%, its advantages are reflected in five aspects: high adhesion, strong durability, high transmittance, high melting finger, easy flow, convenient storage.
Before 2020, China's EVA has no new production capacity, and later in the context of "carbon peak, carbon neutral", the global photovoltaic industry has entered a period of rapid growth, which has brought sufficient and stable demand increase to EVA photovoltaic materials. According to statistics, in 2021, China's EVA new production capacity of 500,000 tons/year, the industry's total production capacity reached 1.472 million tons/year
EVA is a copolymer of ethylene and vinyl acetate, and the rapid increase of its industry capacity has increased the demand for acetic acid. Shandong Desen Lai as one of the main suppliers of acetic acid, we will be excellent product quality, strong supply capacity, sincere service attitude, to help the development of photovoltaic industry!
