新型PVC辅助热稳定剂乙酰丙酮镁的制备及热稳定性能

Preparation and properties of a new PVC auxiliary heat stabilizer——magnesium acetylacetonate

以氢氧化镁[Mg(OH)_2]和乙酰丙酮为原料,乙醇为溶剂,通过一步异相沉淀转化法制备配合物乙酰丙酮镁[Mg(acac)_2],用作聚氯乙烯(PVC)辅助热稳定剂。首先,采用XRD、FTIR、TG对产物进行了结构表征,然后通过静态热老化试验和刚果红试验,对乙酰丙酮镁的热稳定性能进行研究。结果表明,成功制备出产物乙酰丙酮镁,且含有2个结晶水;在PVC中,当主效热稳定剂与辅助热稳定剂的质量比为3∶5时,PVC的热稳定时间长达57min。该生产技术克服了乙酰丙酮镁传统合成方法产率低、操作过程复杂、污染等缺点,制备的产物乙酰丙酮镁与主效热稳定剂具有良好的协同作用,可以有效提高PVC的热稳定性能。

Magnesium acetylacetonate used as a polyvinyl chloride(PVC) auxiliary heat stabilizer was synthesized from magnesium hydroxide [Mg(OH)2] and acetylacetone as raw materials and ethanol as solvent by one-step heterogeneous precipitation conversion technology. The as-prepared magnesium acetylacetonate was characterized by XRD, FTIR and TG-TGA, and its thermal stability was studied by static thermal aging and Congo red test paper.The results show that the prepared product is magnesium acetylacetonate and contains two crystalline water. In PVC, when the mass ratio of the main thermal stabilizer and the auxiliary heat stabilizer is 3∶5, the thermal stability time of PVC is up to 57 min. The production technology overcomes the disadvantages of low yield, complex operation and pollution of the traditional method of synthesis of magnesium acetylacetonate. The prepared product has a good synergistic effect with the main heat stabilizer, and can effectively improve the thermal stability of PVC.