PVC液体复合热稳定剂的制备与应用研究

Study on Preparation and Application of Liquid Composite Thermal Stabilizers for PVC

以异辛酸、氢氧化钠、氢氧化镁、氢氧化钙和氧化锌为原料,白油为溶剂,二乙二醇丁醚为反应促进剂,采用固液一步法合成了异辛酸钠、异辛酸镁、异辛酸钙和异辛酸锌,然后将这4种异辛酸盐复配并用作聚氯乙烯(PVC)体系的热稳定剂。采用刚果红法、HAAKE转矩流变仪及电导率法,系统研究了复合热稳定剂中异辛酸盐的配比对PVC体系热稳定性能的影响。结果表明:三元复配体系的热稳定效果优于二元复配体系;另外在三元复配体系中,异辛酸钠/钙/锌的最佳配比为1/3/2,异辛酸镁/钙/锌的最佳配比为3/1/2。

Isocaprylic acid, sodium hydroxide, magnesium hydroxide, calcium hydroxide and zinc oxide were used as raw materials to synthesize sodium/magnesium/calcium/zinc isooctanoate by the one-step synthesis while white oil as solvent and diethylene glycol butyl ether as the reaction promoter. The compounded isooctanoic acid salts were used in polyvinyl chloride（PVC） composite system as the thermal stabilizer, and Congo red method, HAAKE torque rheometer and conductivity method were used to study the influence of different ratio of the composite thermal stabilizers on the thermal stability of PVC. The results showed that the thermostabilization effect of the ternary compound system was better than that of binary compound system. It had the best thermal stability when the ratio of sodium/calcium/zinc isooctanoate was 1/3/2 and the ratio of magnesium/calcium/zinc isooctanoate was 3/1/2 in the ternary compound system.