【摘要】 采用2种不同链长胺合成出含酰胺基有机多硫化物(其中BDBS和BDIOS分别为二正丁胺和二异辛胺合成的多硫化物),利用四球摩擦磨损试验机评价其在可生物降解菜籽油中的极压、抗磨及减摩性能,采用扫描电子显微镜和X射线吸收精细结构光谱仪分析上述有机多硫化物的摩擦化学作用机理.结果表明,所合成的2种酰胺基多硫化物均能够提高菜籽油的最大无卡咬负荷pB值,具有抗磨效果且BDBS在所测试负荷下的抗磨效果优于菜籽油和BDIOS;各添加剂在测试负荷范围(196~490 N)内均能够降低菜籽油的摩擦系数,且BDBS的减摩性能优于BDIOS,其磨损表面虽呈现出腐蚀磨损特征,但相比菜籽油的磨斑而言,含添加剂的菜籽油润滑体系下的磨斑表面犁沟明显变浅;酰胺基多硫化物BDBS在中等负荷条件下形成的摩擦膜的最外层主要由吸附态烷基二硫化物和少量FeSO4组成,次表面主要由FeS2和少量FeSO4组成,而摩擦膜本体则由FeS2组成.更多还原

【Abstract】 Two carbamoyl-containing polysulfides,coded as bis[(dibutylcarbamoyl)methyl] polysulfide and bis[(diisoctylcarbamoyl)methyl] polysulfide for BDBS and BDIOS respectively,were synthesized.Extreme pressure,anti-wear and friction-reducing properties of additives in one kind of biodegradable oils as rapeseed oil were evaluated using the four-ball tester.Worn scar surfaces were investigated by using scanning electron microscopy and X-ray absorption near edge structure spectroscopy.The results indicate that both carbamoyl-containing polysulfides increased the maximum non-seizure load greatly,the anti-wear properties of them were better than that of RSO and the additive BDBS possessed the best performance among them.Meanwhile,the friction-reducing capabilities were more favorable than that of RSO under the applied loads ranging from 196 N to 490 N and the capability of BDBS was better than that of BDIOS.The furrows of worn surface with RSO containing the additive 1.0 wt.% BDBS turned to be more shallow than that of RSO,though corrosive worn was found by SEM.For the tribofilm generated from BDBS,the outer layer consisted of adsorbed alkyl disulfide mostly and a little amount of FeSO4,and the subsurface consisted of FeS2 mainly and a little amount of FeSO4,while bulk layer was dominated by FeS2.更多还原