以两种不同粒径的锡酸锌（Zn₂SnO₄）为阻燃剂，配以钙锌稳定剂及邻苯二甲酸二辛酯，对聚氯乙烯（PVC）材料进行改性，通过熔融共混挤出法制备两种PVC/Zn₂SnO₄复合材料。采用拉伸试验仪、极限氧指数（LOI）测定仪及电压击穿试验仪对复合材料的力学性能、阻燃性能及抗电压击穿性能进行表征。结果表明：随着Zn₂SnO₄-1和Zn₂SnO₄-2添加量的增加，相应复合材料的拉伸强度及LOI呈逐渐上升趋势。随着Zn₂SnO₄-2添加量的增加，复合材料断裂伸长率呈先升后降趋势；当Zn₂SnO₄-2添加量为2份时，断裂伸长率最大。相对PVC/Zn₂SnO₄-1复合材料，PVC/Zn₂SnO₄-2复合材料的LOI、拉伸强度及抗电压击穿强度值更高。

Two kinds of PVC/Zn₂SnO₄ composites were prepared by melt blending extrusion method using two kinds of zinc stannate (Zn₂SnO₄) with different particle sizes as flame retardant with calcium-zinc stabilizers and dioctyl phthalate for modification of polyvinyl chloride (PVC) materials. The mechanical properties, flame retardancy and anti-voltage breakdown performance of composites were investigated by a tensile tester, a limiting oxygen index (LOI) tester and a voltage breakdown tester. The results showed that the tensile strength and LOI of the composites increased as the increase of Zn₂SnO₄-1 and Zn₂SnO₄-2 adding amount. The elongation at break of the composites first increased and then decreased as the increase of Zn₂SnO₄-2 adding amount, which reached the maximum value when the adding amount of Zn₂SnO₄-2 was 2 phr. The LOI, tensile strength and voltage breakdown strength of the PVC/Zn₂SnO₄-2 composites were higher than that of PVC/Zn₂SnO₄-1 composites.