功能化聚乙烯亚胺选择性降低卷烟烟气中的HCN

Functionalized poly(ethylenimine) material for selectively reducing HCN in cigarette smoke

为选择性降低卷烟主流烟气中氰化氢(HCN)的释放量,制备了过渡金属离子改性的聚乙烯亚胺(PEI)液体功能材料,对材料进行了紫外-可见吸收光谱(UV-Vis)和热重分析(TG)表征。利用卷烟添加剂性能模拟评价装置考察了制备材料降低烟气中HCN的性能,并优化了材料的制备条件;将优化后制备的材料以涂布在纸-醋纤二元复合滤棒中的形式应用于卷烟。结果表明:1金属离子改性的PEI功能材料具有较好的水溶性,在280℃以下具有良好的热稳定性;2PEI重均分子量为600、溶液质量分数为20%、金属离子为Zn^(2+)且Zn^(2+)/PEI比值为2.93×10^(-4)mol/g时,所制备的功能材料对烟气HCN降低性能最好;3与对照卷烟相比,材料添加量为10.6 mg/支的试验卷烟主流烟气HCN的选择性降低率为40.2%,焦油和感官质量基本不变;材料添加量为19.9 mg/支时,HCN的选择性降低率高达72.1%,但卷烟感官质量有一定降低。

To selectively reduce HCN in cigarette smoke, transition metal ion functionalized poly（ethylenimine）（PEI） material was prepared and characterized by UV-vis and thermogravimetric（TG） analysis. An experimental setup to simulate cigarette filter was used to evaluate the capability of the material to reduce HCN. The material preparation conditions were optimized and the final materials were applied to cigarette by paper coating method onto the paper filter segment of the paper-acetate dual filter. The results showed that： 1）The modified PEI featured high water solubility and thermally stable below 280 ℃. 2）The optimal preparation condition of the material was： PEI MW 600, PEI concentration 20%（W/W）, and the ratio of Zn^（2＋）to PEI 2.93×10^-4mol/g. 3） Comparing with the control, the HCN in mainstream smoke from cigarettes with filters containing 10.6 mg PEI per cigarette was selectively reduced by 40.2% while tar level and sensory quality of the cigarettes were basically unchanged. At an addition rate of 19.9 mg per cigarette, the selective reduction rate of HCN reached 72.1%, but the sensory quality of the cigarette deteriorated.