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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。
A new type of solid superacid catalyst TMS was prepared by liquid-phase deposition of Ti O 2 on MCM-41 mesoporous molecular sieves and impregnation with (NH 4) 2 S 2 O 8. The structure of TMS catalyst was characterized by infrared spectroscopy, scanning electron microscopy, pore size analysis, acid value and wastewater volume, COD concentration and total COD concentration. The effects of Ti2O loading on the catalytic performance and the effect of TMS catalyst on polycondensation reaction rate were investigated. The results show that when the Ti / Si atomic ratio is 0.5, TMS can achieve the best catalytic effect. The use of TMS catalyzed unsaturated polyester resin polycondensation reaction can significantly speed up the reaction rate, shorten the reaction time, energy saving. At the same time, the total amount of water in the polymerization process decreased slightly, the total amount of accumulated COD decreased significantly, which was 19% ~ 41% lower than the reaction system without catalyst. TMS catalyst is one of the effective ways to realize the green production of unsaturated polyester resin.