超支化聚乙烯亚胺型分散剂对吸热型碳氢燃料热氧化沉积的抑制研究OA

Aiming at the issues of insufficient thermal stability and weak dispersion efficiency of traditional dispersants,this work constructs a novel dispersant system based on hyperbranched polyethyleneimine.Three novel dispersants named PH-10000,PH-600 and PL-10000 were synthesized using polyethyleneimines with different structures and different relative molecular weights as the core and polyisobutenyl succinic anhydride(PIBSA)as the hydrocarbylating agent.The molecular structures of the synthesized products are characterized by proton nuclear magnetic resonance spectroscopy(1H NMR)and Fourier-transform infrared spectroscopy(FTIR),and their physicochemical properties and dispersion capabilities are studied.The results show that compared with the conventional dispersant T-155,the hyperbranched polyethyleneimine-based dispersants have significant advantages in application performance.The initial decomposition temperatures of PH-600 and PH-10000 are more than 56℃higher than that of the dispersant T-155,demonstrating superior thermal stability.With excellent thermal stability,abundant polar adsorption sites and strong steric barrier effect,the hyperbranched polyethyleneimine-based dispersants can effectively prevent the sedimentation of oxides in high-temperature environments,thereby improving the thermal oxidation stability of fuels.