邻羟基二苯甲酮铈复合稳定剂对CPVC热稳定和光稳定作用的研究

Thermal Stability and Light Stability of CPVC with O-hydroxybenzophenone Ketone Cerium Composite Stabilizer

以4-丙烯氧基-2-羟基二苯甲酮为有机配体,以Ce_(2)(CO_(3))_(3)为稀土源合成了邻羟基二苯甲酮铈(Ce-HABP)稀土化合物,运用元素分析、热重、红外对该化合物进行了表征,并对其Ce含量进行了测定;将邻羟基二苯甲酮铈稀土化合物与硬脂酸锌、水滑石、复合润滑剂及抗氧剂等复配得到了氯化聚氯乙烯(CPVC)用新型稀土复合稳定剂,并通过转矩流变实验、烘箱老化实验、刚果红实验及双辊开炼实验,比较并研究了有机锡热稳定剂和邻羟基二苯甲酮铈复合稳定剂的热稳定性能。结果表明:邻羟基二苯甲酮铈复合稳定剂的热稳定性能明显优于有机锡热稳定剂的稳定性能,其烘箱老化时间超过60 min,刚果红变色时间达到43 min;同时研究了邻羟基二苯甲酮铈复合稳定剂的光稳定性能,经QUV人工加速老化实验,ΔE变化值仅为1.42,经42 d户外老化实验,拉伸强提高了近30%,拉伸断裂伸长率保持率在90%左右。

The rare earth compounds of o-hydroxybenzophenone cerium(Ce-HABP)were synthesized with 4-acryoxygen-2-hydroxybenzophenone as the organic ligand and cerium chloride as the rare earth central ion.The compound was characterized by elemental analysis,thermogravimetry,IR,and rare earth content determination.Ce-HABP was compounded with zinc stearate,hydrotalcite,lubricant and antioxidants,obtaining a new kind of CPVC rare earth compound stabilizer.Through the torque experiment,oven aging experiment,Congo red and double roller grinding experiment,the thermal stability of thermal organic tin stabilizer and o-hydroxybenzophenone cerium composite stabilizer were compared and studied.The results show that the thermal stability of o-hydroxybenzophenone cerium composite stabilizer is obviously better than that of organotin thermal stabilizer.The oven aging time is more than 60 min and the discoloration time of Congo red is 43 min.At the same time,the light stability of o-hydroxybenzophenone cerium composite stabilizer was studied by QUV artificial accelerated aging experiment,ΔE is only 1.42.After 42 d of outdoor aging test,the tensile strength increased by nearly30%,and the retention rate of tensile elongation at break is about 90%.