固体超强酸催化对不饱和聚酯绿色生产的影响

Studies on the effect of solid superacid catalysis on the green production of unsaturated polyester

采用液相沉积法在MCM-41介孔分子筛上负载Ti O_2,再用（NH_4）_2S_2O_8浸渍制备了新型固体超强酸催化剂TMS。通过红外光谱,扫描电镜,孔径分析,酸值和废水量、COD浓度及累积COD总量测定表征了TMS催化剂的结构,研究了Ti O_2负载量对催化效果以及TMS催化剂对缩聚反应速率的影响。结果表明,当Ti/Si原子比为0.5时,TMS可达到最佳的催化效果。采用TMS催化不饱和聚酯树脂的缩聚反应能明显加快反应速度,缩短反应时间,节能降耗。同时,聚合过程总出水量略有减少,累积COD总量显著下降,比未使用催化剂的反应体系降低19%~41%。采用TMS催化剂是实现不饱和聚酯树脂绿色生产的有效途径之一。

The solid superacid catalyst TMS was synthesized by liquid deposition of Ti O_2 onto mesoporous molecular sieve MCM-41,followed by soaking with（NH_4）_2S_2O_8solution. The structure of TMS was characterized. The influence of Ti O_2 loading amount on the catalytic effect and the effect of TMS catalyst on the polycondensation speed were investigated by infrared spectroscopy, scanning electron microscopy, pore size analysis and testings of acid value,waste water volume, COD concentration and accumulated COD amount. The results showed that when the molar ratio of Ti to Si was 0.5 ∶ 1,the TMS could achieve the best catalytic effect. The polycondensation speed of unsaturated polyester could be significantly increased using TMS as catalyst. The reaction time was shortened and the energies were saved. At the same time, the total water volume in the polymerization process was decreased slightly. The accumulated COD amount was significantly decreased by 19%-41% compared with that of no using catalyst system. Using TMS as catalyst was one of the effective ways to achieve the green production of unsaturated polyester resin.