制备了稀土铕转光剂添加量分别为 0. 2% ,0. 5% ,1. 3% 和 2. 0% (质量分数)的 LDPE 转光膜,测定了其在 200 ~ 800 nm 区间内的透射光谱。 将 LDPE 转光膜用于橙味固体饮料的包装,并置于 UV 灯下进行照射,观察了其颜色变化。 以橙味固体饮料的吸光度值作为变色指标,得到了吸光度值与 UV 灯光照时间的变化关系。结果表明,稀土铕转光剂添加量为 1. 3% 的透明 LDPE 转光膜可作为该产品的包装材料,可使其颜色保持的时间最长。

LDPE light conversion film of 0. 2% , 0. 5% , 1. 3% and 2% ( mass fraction) rare earth europium light conversion agent were prepared. The transmission spectrum was measured in the range of 200 ~ 800 nm. The LDPE light conversion films were used for packaging orange flavor solid beverage whose color change was observed when under UV light. With absorbance of orange flavor solid beverage as color index, the relationship between absorbance and UV light exposure time were obtained. The result showed that the transparent LDPE light conversion film containing 1. 3% rare earth europium light conversion agent can be used as the packaging material of the product, which will make its color keep the longest time.