N, N'-bis (salicylaldehyde) ethyldiamino-zinc (BSE-Zn) was synthesized from salicylaldehyde and ethylenediamine. Its structure was analyzed by FT-IR, ¹H NMR and elemental analysis. The thermal properties of PVC samples were studied by thermal aging oven test, Congo red test, conductivity test, thermogravimetric analysis (TGA) and UV–Visible spectroscopy (UV–Vis). The thermal stability of BSE-Zn stabilized PVC samples was better than the calcium zinc soaps used in industry. The thermal stability time can be as long as 90 min, which proved that BSE-Zn was a long-term thermal stabilizer. By blending CaSt₂ and BSE-Zn stabilizer in different proportions, the thermal stability of PVC was significantly improved while improving the initial color. When the compound ratio is CaSt₂/BSE-Zn=2:1, the thermal stability of PVC sample was best and didn't age until 120 min. In addition, it was verified by tensile test that the PVC sample stabilized by BSE-Zn had the highest tensile strength and elongation at break, which could improve the mechanical properties of PVC and make the PVC film have better toughness and elasticity. the quantum chemical calculation of BSE-Zn and vinyl chloride models was carried out, and the thermal stability mechanism of BSE-Zn on PVC was analyzed accurately, mainly the absorption mechanism of HCl and the replacement mechanism of unstable chlorine atoms.

N, N'-双（水杨醛）乙基二氨基锌（BSE-Zn）是由水杨醛和乙二胺合成的。通过FT-IR、¹ H NMR和元素分析对其结构进行了分析。通过热老化烘箱试验、刚果红试验、电导率试验、热重分析（TGA）和紫外-可见光谱（UV-Vis）研究了PVC样品的热性能。BSE-Zn 稳定 PVC 样品的热稳定性优于工业上使用的钙锌皂。热稳定时间可达90 min，证明BSE-Zn是一种长效热稳定剂。通过将CaSt ₂和BSE-Zn稳定剂按不同比例共混，在改善初始颜色的同时显着提高了PVC的热稳定性。复合比为CaSt _2时/BSE-Zn=2:1，PVC样品的热稳定性最好，直到120分钟才老化。此外，通过拉伸试验验证，经BSE-Zn稳定的PVC样品具有最高的拉伸强度和断裂伸长率，可以提高PVC的力学性能，使PVC薄膜具有更好的韧性和弹性。对BSE-Zn和氯乙烯模型进行了量子化学计算，准确分析了BSE-Zn对PVC的热稳定机理，主要是HCl的吸收机理和不稳定氯原子的置换机理。