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对比研究了三种热稳定剂对PVC/CPVC合金流变性能、热稳定性及力学性能的影响。通过HAAKE流变仪试验,表明温度升高至195℃,铅盐体系和有机锡体系的PVC/CPVC合金有不同程度的分解,而铅/钙/锌复合体系热稳定效果较好,平衡扭矩保持不变。维卡软化实验结果证明铅/钙/锌复合体系能够保持PVC/CPVC合金较高的微卡软化温度,达到107.5℃。另外,铅/钙/锌复合体系的PVC/CPVC合金能够保持较高的冲击强度和拉伸强度,该复合体系更适合于PVC/CPVC合金的成型加工。
The effects of three heat stabilizers on the rheological properties, thermal stability and mechanical properties of PVC / CPVC alloys were compared. The HAAKE rheometer test showed that the temperature was raised to 195 ℃, the lead salt system and the organic tin system of PVC / CPVC alloy have different degrees of decomposition, and lead / calcium / zinc composite system better thermal stability, balance torque retention constant. Vicat softening experimental results show that the lead / calcium / zinc composite system can keep the higher microcard softening temperature of PVC / CPVC alloy to 107.5 ℃. In addition, PVC / CPVC alloy of lead / calcium / zinc composite system can maintain high impact strength and tensile strength, and the composite system is more suitable for the molding of PVC / CPVC alloy.