Study On The Application Of Ethylene-Methyl Methacrylate Copolymer For Photovoltaic Cell Encapsulation Film

At present,ethylene-vinyl acetate copolymer(EVA)is the main encapsulation material of photovoltaic modules.EVA film has the performance of high light transparency and low melting point.But because of EVA film’s poor weather resistance performance and poor adhesive performance,many researchers are trying to develop its alternative products.Ethylene-methyl methacrylate copolymer(EMMA)is one of the most promising alternative materials for its outstanding aging resistance performance and adhesive performance.In this thesis,the rules of the different agents on EMMA encapsulation film to influence the performance such as peel strength,volume resistivity and crosslinking degree were researched.And the optimal formula was determined through orthogonal test.The crosslinking agent content was 0.50%,assistant crosslinking agent content was 0.50%,silane coupling agent content was 0.20%and light stabilizer content was 0.10%.On the basis of the optimal formula,the performance of EMMA film and EVA film were compared.The results showed that the performance of EMMA film was higher than that of EVA film,the specific results were as follows:the peel strength increased 31.31%;the volume resistivity increased 85.71%;the tensile strength increased 5.53%;the light transmittance increased 0.33%.Secondly,the EMA/EVA film’s performance was studied,and the EMA/EVA film’s performance as content changed rules were as follows:peel strength,volume resistivity,water absorption rate,tensile strength and elastic modulus increased,light transmittance and thermal stability performance slightly increased,crosslinking degree was slightly reduced.Finally,Test the performance of EMMA film after damp heat aging and ultraviolet aging.Results showed that the EMMA film occurred hydrolysis reaction in the process of damp heat aging.The thermal stability performance decreased slightly after the damp heat aging and ultraviolet aging.