有机大分子中的光稳定剂

光稳定剂是抑制或减缓由于光氧化作用而使高分子材料发生降解的助剂。它可吸收、屏蔽紫外线、吸收高能量紫外线进行能量转换或能迅速将已被紫外线激发的高分子激发态猝回到稳定的基态 ,达到保护高分子材料免受紫外线破坏的作用 ,从而提高高分子材料的使用寿命。综述了光稳定剂的应用背景 ,国内外光稳定剂的类别、作用机理及发展趋势。根据光稳定剂作用机理的不同 ,将光稳定剂分为光屏蔽剂、紫外线吸收剂、激发态猝灭剂及自由基捕获剂。由于蜡类产品在储运、储存及使用过程中受光的照射而使颜色发生改变 ,因此 ,近年来光稳定剂已广泛应用于石油蜡类产品中 ,从而提高了石油蜡类产品的光安定性能

Light Stabilizers in Organic Polymer

Light stabilizers are one of accessory ingredients which restrain photo-oxidative degradation of polymer materials. They can improve the using life span of polymer materials by absorbing and shielding ultraviolet or exchanging energy, or quenching quickly excited state of macromolecule. The application background,categories and action principle of light stabilizers are reviewed. The developing trends of light stabilizers at home and abroad were also introduced. Based on different action principle, light stabilizers were defined as ultraviolet light screening agent, ultraviolet absorbent, quencher and free radical catching agent. The color of petroleum paraffin products changes by light radiation in storage and using process. Light stabilizers are applied widely to petroleum paraffin products to improve their light stability in recent years.