2-氨基烟酸镧铈对PVC热稳定性的影响  

Effect of Lanthanum Cerium 2-Aminonicotinate Acid on Thermal Stability of PVC

作　　者：杨羽轩 杜桂芳 柳召刚[1,2,3] 赵金钢 陈明光 胡艳宏 吴锦绣[1,2,3] 冯福山 YANG Yuxuan;DU Guifang;LIU Zhaogang;ZHAO Jingang;CHEN Mingguang;HU Yanhong;WU Jinxiu;FENG Fushan(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application of Inner Mongolia Autonomous Region,Baotou 014010,Inner Mongolia,China;Key Laboratory of green extraction and efficient utilization of LREE resources,Ministry of education,Baotou 014010,Inner Mongolia,China;Baotou Research Institute of Rare Earth,Baotou 014030,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区稀土湿法冶金与轻稀土应用重点实验室,内蒙古包头014010 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古包头014010 [4]包头稀土研究院,内蒙古包头014030

出　　处：《材料导报》2024年第7期255-262,共8页Materials Reports

基　　金：国家自然科学基金(51634005);内蒙古自治区自然科学基金项目(2022LSM05022)。

摘　　要：以2-氨基烟酸(2-ANA)、Ce(NO_(3))_(3)、La(NO_(3))_(3)和NaOH为原料,合成出2-氨基烟酸镧铈(2-LCANA),研究2-LCANA及其复配稳定剂对聚氯乙烯(PVC)热稳定性能、流变性能和力学性能的影响。结果表明,2-LCANA及其复配稳定剂提高了PVC的热稳定性能,当m(2-LCANA)∶m(ZnSt_(2))∶m(PE)=2∶1∶2时,其热稳定时间为38 min,可以减小在加工过程中的损耗,增强PVC的力学性能,但是随着温度升高2-LCANA要比m(2-LCANA)∶m(ZnSt_(2))∶m(PE)=2∶1∶2的复配稳定剂抑制PVC降解反应发生更有效。2-LCANA能够吸收PVC降解释放的HCl气体,生成LaCl_(3)和CeCl_(3),减弱了HCl对PVC降解的催化作用,可以有效地阻止PVC链上C-Cl和与氯相连的C-H断裂,减少共轭双键的生成,减缓PVC变色,延缓了PVC的热降解。Lanthanum cerium 2-aminonicotinate acid was synthesized from 2-aminonicotinic acid(2-ANA),Ce(NO_(3))_(3),La(NO_(3))_(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(ZnSt 2)∶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(ZnSt 2)∶m(PE)=2∶1∶2 in inhibiting the degradation of PVC.2-LCANA can absorb HCl gas released from PVC degradation,generate LaCl_(3)and CeCl_(3),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.

关 键 词：2-氨基烟酸镧铈 聚氯乙烯 热稳定性能 降解 协同效应 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]