热氧化管法评价发动机油的抗氧化性能

Evaluation on Anti-oxidative Performance of Engine Oils by Thermal Oxidation Tube Method

为了改善燃油经济性和尾气排放,涡轮增压,缸内直喷及汽油颗粒捕集器等技术得以广泛应用,但这也导致了发动机的功率密度进一步提升,对发动机油的高温抗氧化性能提出了更高的挑战。发动机油的高温抗氧化性能的评价主要有发动机台架试验和模拟试验两种方法。与台架试验相比,模拟试验成本低,可操作性强,适用于配方筛选。在170℃高温下,用热氧化管模拟试验将C25W-30发动机油氧化144 h,通过测定发动机油的100℃运动黏度变化,氧化值及沉淀量来考察基础油或抗氧剂的抗氧化性能。热氧化管法评价发动机油的抗氧化性能具有很好的区分性,可以对基础油或抗氧剂的抗氧化性能进行有效地评价,可为基础油或抗氧剂的筛选及发动机油配方的开发及优化提供技术支撑。

In order to improve fuel economy and exhaust emissions,technologies such as turbocharging,in cylinder direct injection and gasoline particulate filter had been widely used,but this also led to the further improvement of engine power density,which posed a higher challenge to the elevated temperature oxidation resistance of engine oils.The evaluation of elevated temperature oxidation resistance of engine oil mainly included engine rig test and simulation test.Compared with the rig test,the simulation test had low cost and strong operability,and was suitable for formula screening.C25w-30 engine oil was oxidized for 144 h at 170℃by thermal oxidation tube simulation test.The oxidation resistance of base Stocks or antioxidants were investigated by measuring the change of 100℃kinematic viscosity,oxidation value and precipitation of engine oil.The thermal oxidation tube method could effectively evaluate the oxidation resistance of base Stocks or antioxidants,and could provide technical support for the screening of base Stocks or antioxidants and the development and optimization of engine oil formula.