1.China Construction Industrial Energy Engineering Group Co,Ltd;2.College of Chemical Engineering,Nanjing Tech University
采用二步法合成了溴代甲基咪唑 修飾的蜜勒胺低聚物催化劑(CN-MIm)，利用FTIR、XRD、SEM、TG和XPS等手段對其結構、形貌和熱穩定性等進行了表征。結果表明，咪唑基離子液體成功負載在蜜勒胺低聚物上，且具有較好的熱穩定性?？疾炝朔磻に嚄l件對環氧氯丙烷（ECH）和CO2環加成活性的影響，以CN-MIm為催化劑，在反應溫度為120 ℃，反應時間為1.5 h，CO2壓力為2.0 MPa，催化劑與ECH質量比為0.036條件下，ECH轉化率和氯代碳酸丙烯酯（CPC）產率分別為99%和98%。實驗表明，CN-MIm對不同環氧化物均具有良好的普適性。此外，提出了蜜勒胺低聚物中含有的羥基、氨基及咪唑基離子液體中溴離子對環氧化物和CO2環加成的協同催化反應機理。
Bromomethylimidazole modified melamine oligomer catalyst(CN MIm) was prepared by two-step method. The structure, morphology and thermal stability of catalyst were characterized by FTIR, XRD, SEM, TG and XPS. The results showed that the imidazole based ionic liquid was successfully loaded on the oligomer of melamine and had good thermal stability. The effects of reaction conditions on the cycloaddition performance of epichlorohydrin(ECH)and CO2 were investigated. Using CN MIm as catalyst, under the conditions of reaction temperature of 120 ℃, reaction time of 1.5 h, CO2 pressure of 2.0 MPa and mass ratio of catalyst to ECH of 0.036, the conversion of ECH and the yield of chloropropylene carbonate(CPC) were 99% and 98%, respectively. Meanwhile, CN MIm had good universality for different epoxides. In addition, the synergistic catalytic reaction mechanism of cycloaddition of epoxide and CO2 by bromine ion in hydroxyl, amino and imidazole based ionic liquids contained in melamine oligomers was proposed.