光伏组件用材料的测量程序.第6-2部分:一般试验.聚合材料的水分渗透试验

[中文适用范围]： 本文件提供了测量聚合物材料（如封装胶、边缘密封材料、前板和后板）的稳态水蒸气透过率（WVTR）、水蒸气渗透率（P）、扩散系数（D）、溶解度（S）和湿气突破时间（定义为达到稳态WVTR 10%的时间）的方法。这些测量可在选定的温度和湿度水平下进行，以评估其在光伏模块中的性能。测量通过对瞬态WVTR曲线的检查并将其拟合到理论的菲克模型来完成。本文件最适用于单片薄膜。如果使用多层薄膜，D和S值仅为表观值，但仍可测量稳态值。本文件是为测量水渗透而编写的，但也可用于其他渗透物，如O2。在这种情况下，使用相同的扩散方程、拟合程序和缩放参数。 [外文原描述]： IEC 62788-6-2:2020 provides methods for measuring the steady-state water vapour transmission rate (WVTR), water vapour permeability (P), diffusivity (D), solubility (S), and moisture breakthrough time (Ƭ10) (defined as the time to reach 10 % of the steady state WVTR) for polymeric materials such as encapsulants, edge seals, frontsheets and backsheets. These measurements can be made at selected temperatures and humidity levels as deemed appropriate for evaluation of their performance in PV modules. Measurement is accomplished by inspection of the transient WVTR curve and by fitting it to a theoretical Fickian model. This document is best applied to monolithic films. If multilayer films are used, the D and S values are only apparent values, but the steady-state values can still be measured.