Hindered Amine Light Stabilizers
Hindered amine light stabilizers (HALS) are one of the most important thermal/light
stabilizing agents of polymeric materials due to their excellent compatibility and
photo-stabilization effect on organic materials. The synthetic technologies of hindered amine light stabilizers 5529 and 5513 were established in this paper. Through deeply systematic research, domestic technical difficulties in hindered amine light stabilizers 5529 industrial productions in taking off impurities and decolorization have been resolved, establishing the production technology of high quality 5529 and conducting industrial production practice. Based on the investigation of the transesterification between dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-piperonal, the synthetic technologies of the Solvent method and free solvent method were established in the second chapter. The hindered amine light stabilizers 5529 were obtained in the yield of97.9% and 97.6% respectively and qualified as the advanced level of the kindred overseas products.