二硫代二苯甲酸二异辛酯作为铜、铝合金润滑剂的摩擦学性能及机理研究  

Tribological Properties and Mechanism of Diisooctyl Dithiodibenzoate as a Lubricant for Copper and Aluminum Alloys

作　　者：何熙 董瑞 马琳 韩云燕 凡明锦 HE Xi;DONG Rui;MA Lin;HAN Yunyan;FAN Mingjin(Shaanxi Key Laboratory of Phytochemistry,College of Chemistry&Chemical Engineering,Baoji University of Arts and Sciences,Shaanxi Baoji 721013,China)

机构地区：[1]宝鸡文理学院化学化工学院陕西省植物化学重点实验室,陕西宝鸡721013

出　　处：《摩擦学学报》2023年第2期167-177,共11页Tribology

基　　金：国家自然科学基金项目(52175156);陕西省科技厅重点研发计划项目(2021GY-157);固体润滑国家重点实验室开放项目(LSL-1812)资助。

摘　　要：以具有特殊双硫醚结构的二硫代二苯甲酸和异辛醇为原料合成了酯类润滑油二硫代二苯甲酸二异辛酯(Phe-S-C_(i8)).采用微动摩擦磨损试验机对其在不同摩擦副上的润滑性能进行评价,使用X射线光电子能谱及扫描电镜对磨斑表面形貌及元素状态进行了表征,对影响其摩擦学性能的因素进行了深入探究.研究结果表明,与参照样1088和Phe-3C_(i8)相比,Phe-S-C_(i8)具有更好的氧化安定性及热稳定性,其作为钢/铜摩擦副的润滑剂,具有一定的减摩抗磨效果;作为钢/铝摩擦副的润滑剂,具有较好的减摩抗磨性能.Phe-S-C_(i8)在以上两种摩擦副上表现出显著优于参照样的极压承载能力.通过对磨斑表面元素进行分析可知,Phe-S-Ci8在钢/铜摩擦副上的减摩抗磨性能主要归因于润滑剂分子在摩擦副表面的物理吸附作用,其在钢/铝摩擦副间的减摩抗磨性能主要归因于Phe-S-C_(i8)与摩擦界面间的化学反应.The ester lubricant(Phe-S-C_(i8))was synthesized by using dithiodibenzoic acid and isooctanol as raw materials.The physical and chemical properties of the sample were evaluated using a variety of instruments.The lubrication performance of the sample on different friction pairs was evaluated and compared with using trioctyl trimellitate(Phe-3C_(i8))and dioctyl sebacate(1088).The friction mechanism was tentatively studied by using the data of scanning electron microscopy and surface element analysis.The results showed that Phe-S-C_(i8)had high viscosity both at 40℃and 100℃,which enabled it to form stable lubricating film on the surface of the friction pair,but the viscosity index of Phe-S-C_(i8)was too small so that its viscosity changed significantly with temperature.This may be because there were two aromatic rings in Phe-S-C_(i8),which increased the viscosity and reduced the viscosity index of Phe-S-C_(i8).Phe-S-C_(i8)was found to have higher pour point,flash point and oxidation stability than the control samples.The reason for the higher thermal stability and pour point of Phe-S-C_(i8)was that Phe-S-C_(i8)had larger molecular weight and more aromatic rings than the comparing samples,which make the molecular structure of Phe-S-C_(i8)more stable and increased the pour point of Phe-S-C_(i8).In addition,a p-π-conjugated system may be formed between the thioether structure and the aromatic rings,this system allowed increasing the thermal stability and pour point of Phe-S-C_(i8).Phe-S-C_(i8)had significantly high oxidation stability.The reason for the good oxidation stability of Phe-S-C_(i8)was that there was a thioether structure in the Phe-S-C_(i8)molecule,which was a natural antioxidant structure.it formed the SRV test results showed that the synthetic Phe-S-C_(i8)had stable friction coefficient and lower wear volume as lubricant for steel/copper and steel/aluminum friction pairs compared with the reference samples.The SEM results showed that abrasion on the copper surface was mainly abrasive wear,while abras

关 键 词：酯类润滑油 双硫醚 热稳定性 氧化安定性 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论] TH117.2