SiC填料对光伏封装用EVA导热复合胶膜的影响

Effect of SiC Filler on EVA Thermal Conductive Composite Film for Photovoltaic Encapsulation

中文关键词: 晶须SiC  EVA  交联度  力学性能  导热性能

英文关键词: whisker SiC  EVA  crosslinking degree  mechanical property  thermal conductivity

中文摘要:

      目的 探讨乙烯-醋酸乙烯酯共聚物（EVA）胶膜中加入晶须碳化硅（SiC）无机填料后，对EVA胶膜交联度、力学性能及导热性能的影响。方法 通过将晶须SiC无机填料导入EVA，使得在整个体系内呈连续相的有机大分子与呈分散相的无机填料共混成一体，再通过挤出流延成形得到厚度均一的胶膜。结果 随着晶须SiC含量的增加，EVA复合胶膜的抗拉强度和断裂伸长率均有所下降。交联度随着SiC含量的增加而略微增大，最终达到平衡，剥离强度先增大后减小。使用不同的偶联剂对SiC表面进行处理，EVA导热复合胶膜导热性能存在差异。使用同一种偶联剂对SiC表面进行处理，SiC粒径尺寸的差异同样对EVA导热复合胶膜导热性能存在差异。结论 添加晶须SiC的尺寸规格、添加量、表面处理情况对EVA导热复合胶膜的力学性能、交联度影响较大。

英文摘要:

      The work aims to investigate the effect on the crosslinking degree, mechanical property and thermal conductivity of the EVA film after the addition of SiC inorganic filler into the ethylene-vinyl acetate (EVA) copolymer film. With the SiC inorganic filler added into EVA, the organic macromolecules of continuous phase in the whole system and the inorganic filler of dispersed phase were blended. Then, the films of uniform thickness were obtained by extrusion casting and forming. The tensile strength and elongation at break of EVA composite film decreased with the increase of SiC content. The crosslinking degree slightly increased with the increase of SiC content, and the balance was finally achieved. The peel strength increased first and then decreased. When SiC surface was treated by different coupling agents, the thermal conductivity of EVA thermal conductive composite films was different. When SiC surface was treated by one coupling agent, there was still difference between the SiC particle size and the thermal conductivity of EVA thermal conductive composite films. The size, additive amount and surface treatment of added SiC have great impact on mechanical property and crosslinking degree of EVA thermal conductive composite films.