环保增塑剂环己烷1,2-二甲酸二（2-丙基庚）酯的合成及性能研究

Preparation and Evaluation of the Environment-Friendly Plasticizer Di(2-propylheptyl)-1,2-Cyclohexane Dicarboxylate

摘要:

以六氢苯酐和2-丙基庚醇为原料，钛酸四丁酯为催化剂，进行酯化反应得到环己烷1,2-二甲酸二（2-丙基庚）酯(DPHCH)增塑剂。考察了醇酸摩尔比、催化剂种类及催化剂用量、反应温度、反应时间等对产品酯化率的影响。确定了最佳工艺条件为：醇酸摩尔比为2.8:1，反应温度为200℃，反应时间为3 h，催化剂用量为六氢苯酐质量的1.5 %。在最优条件下得到的产品为无色透明油状液体，反应的酯化率可达到99.49 %。采用傅里叶变换红外光谱(FT-IR)及核磁氢谱对DPHCH进行结构表征，将DPHCH作为增塑剂制成聚氯乙烯( PVC) 树脂，并进行了拉伸性能、挥发减量、热重分析，实验结果表明，DPHCH 具有优异的增塑性能，热稳定性能，具有极大的工业化开发价值。

Abstract:

Di(2-propyheptyl)-1,2-Cyclohexane Dicarboxylate (DPHCH) was synthesized via esterification between hexahydrophthalic anhydride (HHPA) with 2-propylheptanol by using tetrabutyl titanate as a catalyst. The effects of reaction parameters on esterification were studied by investigating the temperature, reaction time, molar ratio of 2-propylheptanol-to-HHPA, and catalyst content. The results of experiments confirmed the best reaction conditions of esterification as follows: molar ratio of 2-propyl heptanol to HHPA 2.8:1, the reaction temperature was 200℃ and the reaction time was 3 h, amount of catalyst 1.5 %( based on the mass of acid). Furthermore, the esterification yield under present condition was 99.49 % and a colorless transparent oily liquid was obtained. Functional group analysis was conducted by using FTIR and 1H-NMR spectroscopy. weight loss on heating and TG were measured PVC compounds after addition of the synthesized plasticizer DPHCH presented similar plasticizing performance with DEHCH, DOP and DINCH, as demonstrated by comparisons of the results of mechanical properties, weight loss on heating and TG tests obtained for plasticized PVC compounds, indicating its great value in industrial development.