Biodegradability and Tribological Properties of Mineral Base Oil Enhanced by Caprylic Methyl Diethan

• 作 者: Ding Jianhua Fang Jianhua Chen Boshui Liu Ping Fan Xingyu Chen Ran
• 机 构: Department of Oil, Army Logistics University, Chongqing 401311;Military Representative Office in Pet
• 出 处: 中国炼油与石油化工（英文版）
• 发表日期: 2019年2期
• 关键词: additive biodegradability friction wear extreme pressure properties

The influence of synthetic caprylic methyl diethanolamine phosphate ester (abbreviated as MDEACP) on biodegradability and tribological properties of 400SN mineral base oil was studied. The biodegradability of the neat base oil and the oil doped with MDEACP was determined on a biodegradation tester. The tribological properties of the neat base oil and the oil doped with MDEACP were evaluated on a four-ball tester. Moreover, the w surfaces were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results revealed that MDEACP significantly promoted the biodegradation of the mineral base oil. The improvement in biodegradability was attributed to the enhanced growth and quantity of microbes by MDEACP. Furthermore, MDEACP enhanced the anti-wear properties, the friction-reducing properties, and the extreme pressure properties of the base oil. It was mainly attributed to the formation of the complex boundary lubrication film resulted from the adsorption and tribochemical reactions of MDEACP on the friction surface.