HALS intercalated layered double hydroxides as an efficient light stabilizer for polypropylene

摘要

The thermal stability and migration resistance of light stabilizers are vital for their applications in plastics. Herein, a novel nano organic-inorganic hybrid light stabilizer with high thermal stability and low solubility was prepared by intercalating a synthesized hindered amine light stabilizer (HALS) with UV absorption capability into the interlayer galleries of MgAl layered double hydroxides (LDH) through co-precipitation method. The prepared HALS-LDH was characterized by XRD, FT-IR, SEM, TG-DTA and UV-vis, and was incorporated into the matrix of polypropylene (PP) via solvent casting method to prepare LDH/PP composite for light stability test. It was found that the synthesized HALS was successfully intercalated into the interlayer galleries of MgAl-LDH, forming an organic-inorganic hybrid material HALS-LDH with a mean size of 63 nm. HALS-LDH nanosheets were evenly dispersed in the matrix of PP, and the addition of HALS-LDH can retard the thermal decomposition of PP. Moreover, the incorporation of HALS-LDH significantly improved the light stability of PP and reduced the photo degradation of PP by about 83.2%. Therefore, the prepared novel HALS-LDH has potential application in the field of PP as an efficient and promising light stabilizer.