环保型增塑剂DOTP的制备及应用研究

摘要

We studied the synthesis of plasticizer DOTP using mixed PTA and PTA waste as raw materials along with compound catalyst. After comparing the effects of different reaction conditions, the optimum synthetic conditions were obtained as follows: the molar ratio 2.4 : 1, the amount of catalyst 0.3 %, reaction time 6 h, reaction temperature 220 ℃ ; the decolourization dosage 5 %, temperature 80 ℃, time 1 h. Under this condition, the yielded product had the volume resistivity of ≥ 9.0 × 1011Ω·cm. GC-MS analysis showed that phthalate dioctyl content was up to 95.94 %. Compared with DOP, the product has excellent performance, higher heat resistance and more economic benefits.%以对苯二甲酸（PTA）与对苯二甲酸回收料按一定的比例混合为原料在复配催化剂作用下合成增塑剂对苯二甲酸二异辛酯（DOTP）。讨论丁同反应条件对合成工艺的影响，确定了最佳工艺路线为：纯PTA质量分数占总原料的10％，醇酸物质的量之比2．4：1催化剂用量0．3％，反应时间6h，反应温度220℃；脱色剂用量为5％，脱色温度80℃，脱色时间1h。按此工艺所制得产品体积电阻率≥9．0×1011Ω·cm。气质联用分析结果表明：对苯二甲酸二异辛酯GC含量高达95．94％。与DOP相比性能优良，耐热性高，具有一定的经济效益。