马来酸单异辛酯钙/锌的制备及其在PVC中的应用

Preparation of Calcium/zinc mon-2-ethylhexyl maleate and Its Application in PVC Products

摘要:

以异辛醇和马来酸酐为原料合成了马来酸单异辛酯，再与乙酸钙/锌进行反应制得马来酸单异辛酯钙/锌，通过红外光谱对其结构进行了表征，然后将其作为热稳定剂加入到PVC中，通过热烘箱老化法、刚果红法、电导率测试、热失重测试来考察马来酸单异辛酯钙/锌的热稳定性，通过制酸力测试进一步探索热稳定机理；并考察了钙铝水滑石（LDH）对钙/锌体系的协同作用。结果表明：当马来酸单异辛酯钙/锌复合热稳定剂中金属离子的质量分数分别为ω（Ca2+）=3%和ω（Zn2+）=2%时，该体系表现出最好的热稳定性，初期白度时间达50 min，静态热稳定时间为26 min。当加入0.08 g水滑石（LDH）时，热稳定性有明显的改善，静态热稳定时间为53.5 min。

Abstract:

2-Ethyl hexanol and maleic anhydride were used to synthesis the mon-2-ethylhexyl maleate, then the mon-2-ethylhexyl maleate were reacted with calcium acetate (zinc acetate) to prepare the calcium(zinc) mon-2-ethylhexyl maleate. The mon-2-ethylhexyl maleate and the final productions verified by FTIR. The thermal stabilities of PVC in the presence of the calcium/zinc mon-2-ethylhexyl maleate were evaluated systematically by means of thermal aging oven test,Congo red test and conductivity test and thermogravimetric analysis(TGA), the mechanism of calcium/zinc mon-2-ethylhexyl maleate thermal stabilizer was investigated by testing the absorption of acid.And then the synergistic effects of layered double hydroxide(LDH) with Ca/Zn system were explored. When the mass fraction of metal ions of the calcium / zinc mon-2-ethylhexyl maleate compound heat stabilizer were 3% and 2%，respectively, the system exhibited the best thermal stability, which provided the initial whiteness time of 50 min and the static thermal stabilization time of 26 min. At the same time when added 0.08g hydrotalcite (LDH), the system’s thermal stability had improved significantly, whoes the static thermal stabilization time reached at 53.5min.