Effect of Lanthanum Cerium 2-Aminonicotinate Acid on Thermal Stability of PVC
YANG Yuxuan1,2,3, DU Guifang1,2,3, LIU Zhaogang1,2,3,*, ZHAO Jingang1,2,3, CHEN Mingguang1,4, HU Yanhong1,2,3, WU Jinxiu1,2,3, FENG Fushan1,2,3
1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application of Inner Mongolia Autonomous Region, Baotou 014010, Inner Mongolia, China 3 Key Laboratory of green extraction and efficient utilization of LREE resources, Ministry of education, Baotou 014010, Inner Mongolia, China 4 Baotou Research Institute of Rare Earth, Baotou 014030, Inner Mongolia, China
Abstract: Lanthanum cerium 2-aminonicotinate acid was synthesized from 2-aminonicotinic acid(2-ANA), Ce(NO3)3, La(NO3)3 and NaOH. The effects of 2-LCANA and its compound stabilizer on the thermal stability, rheological and mechanical properties of polyvinyl chloride (PVC) were studied. The results showed that 2-LCANA and its compound stabilizer improved the thermal stability of PVC. When m(2-LCANA)∶m(ZnSt2)∶m(PE)=2∶1∶2, the thermal stability time was 38 min, which could reduce the loss in the processing process and enhance the mechanical properties of PVC. However, with the increase of temperature, 2-LCANA was more effective than m(2-LCANA)∶m(ZnSt2)∶m(PE)=2∶1∶2 in inhibiting the degradation of PVC. 2-LCANA can absorb HCl gas released from PVC degradation, generate LaCl3 and CeCl3, wea-ken the catalytic effect of HCl on PVC degradation, effectively prevent the breakage of C-Cl and C-H connected with chlorine on PVC chain, reduce the generation of conjugated double bonds, slow down PVC discoloration, and delay the thermal degradation of PVC.
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2024, Vol. 38 
