Intercalated rare earth hydrotalcite-like materials and their application in stabilizers in poly (vinyl chloride)

In this research, ZnAlLa-itaconate-LDHs was synthesized by means of Co-precipitation-hydrothermal method. The effects of aluminum-lanthanum ratio, co-precipitation time, hydrothermal time, and hydrothermal temperature on the crystal structure were studied. As a result, the optimum condition was found to be: n(Al 3+ ): n(La 3+ ) = 10:1, co-precipitation time 24 h, hydrothermal time 8 h, and hydrothermal temperature 180°C. The influence of ZnAlLa-itaconate-LDHs on the thermal stability properties and plasticizing properties of PVC were investigated, exhibiting long-term stability of 76 min with short plasticizing time of 1.11 min. Long-term thermal stability mechanism was studied by FTIR before and after hydrochloric acid treatment. It was demonstrated that the thermal stabilizer ZnAlLa-itaconate-LDHs prevented the rupture of the C  Cl bond in PVC and inhibited the development of HCl. Consequently, impeded the production of CC bond and playing a role in thermal stabilization of PVC.