聚乙烯醇复合薄膜的抗紫外线性能

目的研究聚乙烯醇(PVA)复合薄膜(添加紫外线阻隔剂)的紫外线透过率和透明性能。方法将不同种类、不同质量分数的紫外线阻隔剂与PVA原料混合制备复合薄膜,检测其紫外线透过率、透光率、雾度。结果添加有机紫外线吸收剂UV-284后,薄膜能够有效阻隔大部分紫外线,但影响薄膜的外观,复合薄膜呈黄色。无机的紫外线阻隔剂在PVA薄膜中容易发生颗粒团聚,当Nano-Ti O2的质量分数为2.5%时,复合薄膜的平均紫外线透过率达到2%左右,若再增加质量分数则紫外线透过率变化不大。结论紫外线阻隔剂有效降低了PVA薄膜的紫外线透过率,但同时复合薄膜的透光率降低,雾度上升。综合比较,PVA薄膜中添加Nano-Ti O2的紫外线阻隔效果,比加入相同质量分数的UV-284或Nano-Zn O的复合薄膜要好。

Anti-ultraviolet Properties of Polyvinyl Alcohol Composite Films

The work aims to study the ultraviolet transmittance and transparency of the PVA (polyvinyl alcohol) composite film (with UV shielding agents). Composite films were prepared by adding anti-ultraviolet agents with different types and mass fraction into PVA. Then UV transmittance, transparency and haze were tested. Adding organic anti-ultraviolet agent UV-284 could effectively block ultraviolet rays, but the composite film was yellow, which affected the appearance of the product. Adding inorganic UV shielding agent caused particle aggregation in the film. When the amount of inorganic UV shielding agent (Nano-TiO2) was 2.5%, the composite film''s UV transmittance reached about 2%. If more was added, there would be no obvious change. In conclusion, the ultraviolet transmittance of the film is decreased obviously, while the transmittance is decreased and the haze is increased after the addition of UV shielding agent. The UV shielding effect of the composite films with Nano-TiO2 is better than the composite films with the same amount of UV-284 or Nano-ZnO.