脲基氨基甲酸酯化合物的合成及应用研究

在轿车发动机的燃烧室中以及发动机进气系统的汽油喷嘴上,汽油往往因高温及废气的酸性物质作用而产生沉积物,尤其是在喷油嘴上会产生结焦,甚至堵塞喷油嘴,使汽车不能启动运行［'－'j．采用优化发动机设计的办法,对改善沉积物和结焦作用不大,而在汽油中加人汽油清净分散剂却能产生较好的效果．目前,美国加人清净分散剂的汽油已占90％,深入研究新型、高效的清净分散剂已成为研究的热点．按化学结构汽油清净分散剂大致分为两类"－'：（l）小分子胺类,如N一苯硬脂酷胺、单丁二醋亚胺、双丁二酚亚胺和1,3一三甲撑二胺类等;（2）低聚…

The Synthesis and Applied-research of Ureido-urethane

Due to high temperature and acid substance in exhaust, gasoline usually produces deposits on the chamber and gasoline jet of intake air system in engines of a car, carbonating on the jet, even blocking the jet, make engine fail to start and run. The methods of selecting optimum engine design have less effect on reducing deposits and carbonating than does that of adding detergent-dispersant additive into gasoline. Anew compound──ureido-urethane is synthesized by reacting di-iso-cyanate with alcohols and amines. After experiments of selecting optimum reaction condition, testing solubility and percentage of relative oxidation,and evaluating in the PFI imitating device. The results show that the detergent-dispersant property of that compound is superior to the new product of USA(paradyne 748) and compound produced in Shanghai.