S-N型1,3,4-噻二唑-2-硫酮衍生物的摩擦及缓蚀性能研究
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摘要
合成了5-十二烷基二硫代-3-苯基-1,3,4-噻二唑-2-硫酮(DPTT)和5-十六烷基二硫代-3-苯基-1,3,4-噻二唑-2-硫酮(DHTT)。用元素分析、IR、1HNMR等技术对化合物进行了结构表征。用热重分析仪考察了两种化合物的热稳定性;在四球摩擦磨损试验机上评价了其作为菜籽油(RSO)添加剂的摩擦磨损性能;用扫描电子显微镜和X射线光电子能谱仪观察分析了钢球磨损表面形貌和元素化学形态。结果表明:所合成的两种化合物具有较高的热稳定性,能有效地提高菜籽油的抗磨减摩性能;DPTT作为菜籽油润滑添加剂在添加质量分数为0.75%时,其抗磨减摩效果最佳;DHTT添加质量分数为0.5%时,其抗磨减摩效果最佳。两种化合物作为添加剂在较宽的载荷范围内都具有良好的抗磨减摩性能,在同等条件下,两者相比较,碳链较长的DHTT的抗磨性能好于DPTT,而减摩性能比DPTT弱。在摩擦过程中,钢球表面形成了一层含硫化亚铁、二硫化亚铁和硫酸铁、含氮金属配合物、氮氧化合物和氮的有机化合物的复合膜,从而使添加剂具有良好减摩抗磨性能。
     采用动态旋转挂片法考察了DPTT与苯并三唑(BTA)复配时对铜的缓蚀作用。结果表明,单一DPTT在浓度为3.0mg/L时缓蚀效果最佳;DPTT与BTA复配使用时显示出较好的协同效应,1.0mg/L DPTT和1.0mg/L BTA复配时缓蚀效果最好。
     采用失重法考察了0.5 mol/L水解聚马来酸酐和羟基乙叉二磷酸(HEDP)混合溶液中DPTT对铜的缓蚀作用,用二巯基噻二唑(DMTD)作了对比实验。结果表明,DPTT的缓蚀性能随着浓度的增大而增强;在相同浓度下,缓蚀性能优于DMTD。
Novel 1,3,4-thiadiazole-2-thione derivative DPTT and DHTT were synthesized and confirmed by elemental analyses, IR and 1HNMR.The thermal properties of these two compound investigated by thermogravimetric analyzer(TGA);and the tribological properties as additive in rapeseed oil was examined by four-ball tester;Worn surface morphology and element chemical composition of rubbing film was analyzed by means of scanning electron microscopy(SEM) and X–ray photoelectron spectroscopy (XPS).The result indicate that these two compound possess good thermal stability, these novel compound as additive in the rapeseed oil were able to obviously decrease the wear rate and friction coefficient;the additives reacted with metal surface to form a film containing FeS, FeS2 and FeSO4,and nitrogen metal complex,nitrogen oxides and organic nitrogen,all these compound contributed to improve tribological propert- ies of the rapeseed oil.
     The synergistic effect of DPTT and benzotriazole(BTA) as corossion inhibitor for copper were investigated.The result show that the optimal inhibition performance was attained when DPTT was used alone at a concentration of 3.0mg/L.There existed good synergistic inhibition effect when DPTT and BTA were used together,the optim- al composition for the complex inhibitor was recommended as 1.0mg/L DPTT and 1.0mg/L BTA.
     The corrosion inhibition action of DPTT for copper in 0.5 mol/L hydrolyzed pol- ymaleic anhydride and HEDP solution was investigated by weight-loss tests, using dimerapto-1,3,4-thiadiazole(DMTD)carry through the comparison study, result show that the inhibition effect of the DPTT increased with increasing concentration of the equate concentration, the inhibition effect of DPTT is better than DMTD.
引文
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