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利用乙酰丙酮钙和6种乙酰丙酮镧系金属化合物为原料,通过每一种乙酰丙酮镧系金属化合物与乙酰丙酮钙和相应质量的高氯酸钠以及氨基脲嘧啶在质量比为1.5∶1.5∶1∶1的复配比例下,配制得到6种固体热稳定剂,将其应用于PVC制品中。通过热老化、刚果红,电导率测试和热失重分析,探究其热稳定性能,并与传统的硬脂酸钙/锌复配热稳定剂对比。结果表明:6种乙酰丙酮稀土复配热稳定剂均属于长期型热稳定剂,其中LaA、NdA、LuA、SmA这4种复配热稳定剂添加3份时,热稳定时间均可达到110 min,与传统的CaSt_2/ZnSt_2复配体系相比延长了将近70 min,并且不出现“锌烧”现象。复配后的热稳定剂添加份数在1~3份时,PVC试片的热失重率曲线不随热稳定剂份数的增加而变化。
Using calcium acetylacetonate and six kinds of lanthanoid acetylacetonates as raw materials, each of the lanthanum acetylacetonates and calcium acetylacetonate and corresponding mass of sodium perchlorate and aminouracil in a mass ratio of 1.5: 1.5: 1: 1 ratio of compounding, prepared 6 kinds of solid heat stabilizer, its application in PVC products. The thermal stability was investigated by thermal aging, Congo red, conductivity test and TG analysis, in comparison with the conventional calcium stearate / zinc complex heat stabilizer. The results showed that all of the six kinds of acetylacetone rare earth complex thermal stabilizers belong to the long-term thermal stabilizer. When the three kinds of complex thermal stabilizers LaA, NdA, LuA and SmA are added in three parts, the thermal stability time can reach 110 min Compared with the traditional CaSt 2 / ZnSt 2 complex system, it extended nearly 70 min without “zinc burning” phenomenon. The thermal weight loss rate curve of the PVC test piece does not change with the increase of the heat stabilizer when the added amount of the heat stabilizer is 1 to 3 parts.