【摘要】 通过无水哌嗪与二硫化碳以及含不同酯基的氯乙酸酯反应,合成了6种新型无灰、无磷环境友好润滑油添加剂1,4-双(二硫代甲酸乙酸酯基)哌嗪衍生物2a、2b、2c、2d、2e、2f。采用1H NMR1、3C NMR、IR、UV-Vis、MS和元素分析对它们进行表征,确证了其结构,并采用热重分析仪考察了其热稳定性能。利用四球摩擦磨损试验机考察了其在液体石蜡(LP)中的承载能力和添加剂浓度、摩擦时间及载荷对液体石蜡抗磨性能的影响。结果表明,它们的初始分解温度均高于300℃,第二分解温度最高达到370℃,说明它们的热稳定性能良好。此类添加剂具有很高的承载能力,当添加剂用量为1.0%(质量分数)时,样品2c+LP的PB值最大可达1100 N,远比ZDDP+LP样品的PB值高;并且它们能够明显改善LP的抗磨性能,性能最好的是2f。1,4-双(二硫代甲酸乙酸酯基)哌嗪衍生物中烷基链的长短和形状(直链或支链)对其承载能力的影响不大,但对抗磨性能有很大的影响,含有长链烷基的哌嗪衍生物抗磨性能更好。更多还原

【Abstract】 Six piperazine derivatives,1,4-di(dithiocarbamate acteate)piperazines,named 2a,2b,2c,2d,2e,2f,were synthesized from the reaction of piperazine with carbon disulfide and chloroacetate,whose structures and thermal stability were determined by 1H NMR,13C NMR,IR,UV-Vis,MS,elemental analysis and thermogravimetric apparatus,respectively.These piperazine derivatives were used as the novel,environmentally friendly and ash-less and non-phosphorus lubricating oil additives in liquid paraffin(LP).Their load-carrying capacity as lubricating oil additives and the effects of additive concentration,friction time and load on the anti-wear performance of LP were evaluated by using a four-ball tester.The results showed that the six derivatives all thermally decomposed at above 300℃,and the highest decomposition temperature was about 370℃,indicating the fair thermal stability.The six derivatives all possessed excellent load-carrying capacity,and the maximum PB value of the LP sample with 1.0%(mass fraction) 2c added,reached 1100N,much better than that of the LP sample with 1.0% ZDDP.They could improve the anti-wear performance of LP,among which 2f was the best one.The length and shape of alkyl in the molecule of 1,4-di(dithiocarbamate acteate)piperazine had less impact on PB value but length of alkyl was the main factor affecting the anti-wear performance of LP.With the longer length of the alkyl,the anti-wear ability of 1,4-di(dithiocarbamate acteate)piperazine for LP was better.更多还原