PVC辅助热稳定剂乙酰丙酮锌的制备及性能研究

Study on Preparation and Property of Zinc Acetylacetonate as Auxiliary Thermal Stabilizer for PVC

在乙醇为溶剂的一步液相法条件下,用氧化锌和乙酰丙酮反应制得乙酰丙酮锌(简写:Zn-acac),作为聚氯乙烯(PVC)辅助热稳定剂。采用元素分析仪(EA)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)对产物进行结构表征。选用硬脂酸钙(CaSt_2)、硬脂酸锌(ZnSt_2)和辅助热稳定剂Zn-acac为研究体系,通过烘箱热老化和刚果红测试考查其在PVC中的热稳定性能。结果表明:CaSt_2、ZnSt_2质量比为0.375∶0.125时,添加0.02 g的Zn-acac要优于其他添加量,热稳定时间达到46 min,PVC试片100 min完全变黑;另外添加0.02g Zn-acac和不同配比的CaSt_2、ZnSt_2复配后表现出优异的协同作用,CaSt_2、ZnSt_2质量比为0.4∶0.1时最佳,热稳定时间达到55 min,并且通过与双季戊四醇(Di PE)、环氧大豆油(ESBO)对比,Zn-acac热稳定效果更佳。

Zinc acetylacetonate(abbreviation:Zn-acac)as auxiliary thermal stabilizer for PVC is prepared by the reaction of zinc oxide and acetylacetone under the one-step liquid phase method using ethanol as the solvent,afterwards the product was characterized by elemental analysis(EA),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR).The CaSt2,ZnSt2 and auxiliary thermal stabilizer Zn-acac were selected as the research system,and further through the oven heat aging test and Congo red test to investigate its thermal stability in PVC.The results show that when the mass ratio of selected CaSt2 and ZnSt2 is 0.375∶0.125,which is superior to other additives of the addition of 0.02 g Zn-acac,the thermal stabilization time reaches 46 min and the PVC test piece is completely darkened to 100 min.After adding 0.02 g of Zn-acac and different ratios of CaSt2 and ZnSt2,which indicated that the best mass ratio of CaSt2 and ZnSt2 was 0.4∶0.1 and excellent synergistic effect was exhibited,the thermal stabilization time was 55 minutes,and by comparison with dipentaerythritol(DiPE)and epoxidized soybean oil(ESBO),the Zn-acac heat stabilization effect is better.