二元羧酸稀土复合热稳定剂的制备与性能研究

Study on Preparation and Properties of Rare Earth Dicarboxylate Compound Thermal Stabilizer

合成了十四烷二酸稀土(镧/铈/钕)三种稀土热稳定剂,用傅立叶变换红外光谱(FTIR)进行表征。并分别与其它热稳定剂进行多元复配,添加到聚氯乙烯(PVC)树脂中,采用刚果红法测试静态热稳定性能,采用转矩流变仪、动态力学谱仪等考察加工性能和力学性能。结果表明,100份PVC中加入2.3份十四烷二酸稀土盐、1.8份季戊四醇、0.9份β–二酮协同效果最佳,可使PVC试样的静态和动态热稳定时间达到70 min和30 min以上,并能较好地抑制初期着色性;其加工性能和力学性能与铅盐体系相当,弯曲强度和断裂伸长率较高。

Lanthanum （cerium or neodymium）dicarboxylates were synthesized and characterized by fourier transform infrared spectroscopy（FTIR）. They were compounded with other thermal stabilizers respectively and added to poly（vinyl chloride）. Influence of these compound stabilizers on PVC was determined by means of Congo red testing method, torque rheometer tests and dynamic mechanics spectrometer. The results show that the formula with optimal synergy effect is PVC 100 phr, lanthanum（cerium or neodymium）dicarboxylate 2.3 phr, pentaerythritol 1.8 phr, and [3 -diketone 0.9 phr. Static and dynamic thermal stability time could reach more than 70 rain and 30 min. The early coloring of PVC is restrained better. Processing performance and mechanical properties are similar to those of lead salt system, while bending strength and elongation at break are higher.