Abstract:

Soot dispersibility is an important performance index of diesel engine oil. The dispersion performance of biofuel soot (BS) and 0^# diesel soot (DS) in liquid paraffin (LP) and the influence of polyisobutylene succinimide dispersant (T154) were investigated by means of viscosity, spot experiment and particle size distribution. The dispersion mechanisms of BS and DS were investigated by means of X-ray photoelectron spectroscopy and Fourier infrared spectrometer. The surface of BS and DS contained some O-containing functional groups and the oxygen content of BS was higher than that of DS. The effect of oil thickening by DS was greater than that by BS. T154 has a good effect on dispersing BS and DS in LP. The influence of T154 on the BS and LP dispersing system was better than the DS and LP dispersing system. T154 could also be used as a dispersant to disperse BS into lubricating oil. Because of BS surface with O-containing acid groups, such as carboxyl group, and phenolic hydroxyl, it could adsorb T154 by the acid-base reaction with succinimide of dispersant. At the same time, because of BS surface with polar groups, it could adsorb T154 through forming hydrogen bonds with the giving electrons unit of N-H.

Key words: biofuel, soot, dispersion, adsorption, surface

摘要：

碳烟分散性能是柴油机油的一项重要性能指标,采用黏度法、斑点实验法及粒径分布法考察了生物质燃油碳烟(BS)和0^#柴油碳烟(DS)在液体石蜡(LP)中的分散性能及商用分散剂聚异丁烯丁二酰亚胺(T154)对其分散性的影响,并借助X射线光电子能谱仪和傅里叶红外光谱仪分析其分散机理。结果表明,BS和DS表面均带有一些含氧官能团且BS氧含量高于DS;DS对体系增稠作用大于BS,T154对BS和DS在LP中的分散性均有良好的作用,但对BS的分散效果更好。T154亦可作为BS在润滑油中的分散剂使用,因为BS表面含有羧基、酚羟基等含氧酸性基团,可与T154中丁二酰亚胺依靠酸碱作用吸附分散剂。同时,BS表面的极性基团与N-H单元产生氢键而吸附T154。

关键词: 生物质燃油, 碳烟, 分散, 吸附, 表面