二乙二醇醚马来酸酯钙/锌热稳定剂的制备及应用研究

以马来酸酐和二乙二醇醚为原料在无催化剂条件下制得二乙二醇醚马来酸酯(MD),此分子结构中具有酯基、醚键及碳碳双键,将此中间产物分别与乙酸钙、乙酸锌反应,制得二乙二醇醚马来酸酯钙/锌盐(MD-Ca/Zn).通过傅里叶红外测试分析了热稳定剂产物的结构,分子中含有醚键、酯基、碳碳双键、羧酸盐结构,可作为PVC主效热稳定剂.通...

Preparation and applications of diethylene glycol ether maleate calcium/zinc heat stabilizer

Diethylene glycol ether maleate （MD） was prepared using maleic anhydride and diethylene glycol ether as raw materials without a catalyst, and its molecular structure was determined to be ester groups, ether bonds, and carbon?carbon double bonds. This intermediate product was respectively reacted with calcium acetate and zinc acetate to prepare diethylene glycol ether maleate calcium/zinc salt （MD?Ca/Zn）. The structure of the resultant product was further analyzed with FTIR spectroscopy, indicating that its molecule contains ether bond, ester group, carbon?carbon double bond, and carboxylate structure. This indicated that it could be used as a heat stabilizer for PVC. The thermal stabilizing effect of the MD?Ca/Zn was verified through the Congo red, thermal aging, thermogravimetry, electrical conductance measurements as well as the comparation the commercially available calcium/zinc stearate. Its thermal stabilization mechanism was analyzed and explored. Furthermore, the synergistic effect of the MD?Ca/Zn with an auxiliary heat stabilizer, β?diketone （stearoyl benzoyl methane）, was investigated. The results indicated that the PVC compound exhibited an optimal thermal stability at an MD?Ca/Zn mass ratio of 2∶1, and its initial whiteness and static stabilization time reached 40 min and 35 min, respectively. The thermal stability could be further improved by combination with 10 % β?diketone in the total amount of heat stabilizers.