HALS are 2,2,6, 6-tetramethylpiperidine derivatives with spatial potential resistance structure. They confer high stability to polymers by trapping free radicals, splitting peroxides, and transferring excited state energy. HALS has the advantages of high efficiency, less addition, less impact on the product, almost colorless, less toxicity, does not color the material, and moderate price. The photostabilization effect is several times better than UV absorber and quenching agent, and it is the most widely used and the fastest growing.Yuanli Chemical anti-aging additives project is located in the Xiaying Chemical Industrial Park, Changyi, Weifang, covering an area of 667,000 square meters. The first phase plans to build a production device of 35,000 tons of hindered amine light stabilizers (HALS) and other anti-aging products. It mainly includes TAA, TMP, PMP, 770, 292, 3853, 701 and a series of hindered amine light stabilizers products and upstream intermediates.