二烷基二硫代磷酸镧润滑添加剂的构效关系

为研究新型油溶性稀土润滑添加剂二烷基二硫代磷酸镧(LaDDPs)的结构与性能关系,合成了10种含不同碳原子数的伯、仲炕基LaDDPs.利用四球试验机考察了其在500SN基础油中的摩擦磨损性能和极压性能,并探讨了烷基碳链的长短和伯、仲烷基结构对LaDDPs性能的影响.结果表明,含3～8个碳原子烷基的LaDDPs均具有较好的抗磨减摩性能和极压性能.随着碳原子数的增加,LaDDPs的抗磨减摩性能明显提高,其中仲烷基LaDDPs性能优于伯烷基LaDDPs;LaDDPs的极压性能随碳原子数的增加而降低,碳链的连接方式对LaDDPs的极压性能无明显影响.

Structure-behavior relationship of lanthanum dialkyldithiophosphate as lubrication additive

The structure-behavior relationship of lanthanum dialkyldithiophosphate is studied.Ten LaDDPs with different alkyl chains were prepared.The properties of antiwear and extreme pressure of LaDDPs as lubricating oil additive in 500SN base oil were investigated by four-ball machine,and the effects of the length of alkyl chain and the structure of primary or secondary alkyl of lanthanum dialkyldithiophosphate additive on the properties of friction-wear and extreme pressure were explored.The results showed that,for carbon numbers in alkyl in a range of 3 to 8,the additives exhibit excellent properties of antiwear and extreme pressure.The antiwear abilities are improved obviously with the increase of carbon number in alkyl.Moreover,the properties of friction and wear of secondary alkyl LaDDPs have advantages over that of primary alkyl LaDDPs.It is suggested that extreme pressure abilities decrease with the increase of carbon numbers in alkyl and the alkyl construction has little effect on the extreme pressure property.