PVC热稳定剂桐油基二元酸钙的合成及其应用研究

摘要

Calcium carboxylates of tung oil diacid were prepared by adding methyl of C21 diacid(TMAA)as raw material and liquid sodium hydroxide to liquid calcium chloride simultaneously, toluol as solvent. The thermal stability of PVC was determined by means of the Congo-red test and torque rheometer process tests. And its effect on mechanical behaviors of PVC samples was discussed. Preferable synergistic stabilizing effects were observed when zinc stearate and calcium carboxylates of tung oil diacid used together. When using calcium carboxylates of tung oil diacid to replace zinc stearate, it can improve the time of thermal stability and can also reach the demand of processing properties.%以C21二元酸单甲酯(即TMAA)为原料,无水乙醇为溶剂,与氢氧化钠及氯化钙发生复分解反应,制备桐油基二元酸钙盐.经红外进行表征,采用刚果红法和转矩流变仪法考察其对PVC热稳定性的影响,测试其应用于PVC制品时的力学性能.结果表明,桐油基二元酸钙盐与硬脂酸锌具有较好的协同作用；用桐油基二元酸钙取代硬脂酸锌,对PVC的塑化无不良影响,且能提高热稳定时间,应用于PVC制品时加工性能也能达到要求.