Light stabilizer (English name: Light stabilizer; photostabilizer) is an additive for polymer products (such as plastic, rubber, paint, synthetic fiber). It can shield or absorb the energy of ultraviolet light, quench singlet oxygen and decompose hydroperoxide into inactive substances, etc., so that the polymer can eliminate or slow down the possibility of photochemical reaction under the radiation of light, and prevent or delay the process of photoaging, So as to extend the service life of polymer products.