减摩剂在柴油机油中的复配性能研究

STUDY ON TRIBOLOGICAL PERFORMANCE OF COMPLEXING FRICTION MODIFIER IN DIESEL ENGINE OIL

通过四球摩擦磨损试验机对有机钼添加剂A、有机钼添加剂B、磷酸酯及含氮硼酸酯在CF-4 15W-40柴油机油中的复配减摩抗磨作用进行考察,采用均匀设计方法进行试验方案设计,运用多自变量对多因变量的偏最小二乘二次多项式回归方法,建立了温度以及添加剂加量等自变量与低、中、高载荷下的摩擦系数和磨斑直径等因变量之间的回归模型,得到复配减摩的最优配方,并通过试验验证,结果表明:最优减摩配方为有机钼添加剂A、有机钼添加剂B和含氮硼酸酯在油品中的添加质量分数分别为0.779 9%,1.200 0%,0.662 9%,该配方能够有效降低摩擦,减小磨损,平均摩擦系数减小43.6%,磨斑直径减小47.1%。

The four-ball friction and wear tester was used to investigate the tribological properties of complexing friction modifiers of molybdenum dialkyl dithiophosphate and nitrogen-molybdenum complex, phosphate, N-containing borate ester in CF-4 15W-40 diesel engine oil. A uniform designmethod was used to design the test. The partial least squares quadratic polynomial regression method was introduced to establish the regression model of multi-independent variables on the multi-dependent variables. The relationship between independent variables of temperature and additives content and the dependent variables of friction coefficients at low, medium and high load and wear scar diameter （WSD） were created, resulting in the optimum formula of the complexing friction modifier, which was verified by experiment. The results show that the optimum composition of complexing friction modifier is consist of molybdenum dialkyl dithiophosphate and nitrogen-molybdenum complex, phos- phate, N-containing borate estethe as 0. 779 9%,1. 200 0%,0. 662 9%, respectively. The opti- mum formula can effectively reduce the friction and wear. more than 43. 6 % reduction of the friction coefficient and 47. 1% decrease of the WSD.