一种含氮硫杂环硼酸酯的制备及摩擦学性能

Synthesis and tribological properties of a sulfur nitrogen-containing heterocyclic borate ester

以2-[2-苯并噻唑基]为原料合成了2-[2-苯并噻唑基]硫代乙醇（BTE）,再以该BTE合成了一种含氮硫杂环硼酸酯（SNHB）添加剂,并采用FTIR、元素分析对其结构进行了表征。考察了BTE、SNHB的油溶性、热稳定性以及SHNB的水解稳定性。采用四球摩擦磨损试验研究了BTE及SNHB在菜籽油中的减摩、抗磨以及极压性能。采用SEM、EDS观察和分析了钢球磨斑表面形貌及元素。研究结果表明,合成的产物为目标产物BTE和SNHB;在相同的试验条件下,SNHB和BTE在菜籽油中完全溶解,具有较好的油溶性;SNHB和BTE的分解温度范围分别是从270.50~396.01℃、253.04~326.83℃,两者均具有良好的热稳定性,且SNHB的热稳定性优于BTE;SNHB的水解时间超过7天,而市售的硼酸三异丙酯仅为10 min,SNHB有较好的水解稳定性;在不同载荷、添加比例等条件下SNHB的摩擦学性能明显优于BTE。

2-（2-benzothiazolylthio） ethanol（BTE） was synthesized using 2-mercapto benzothiazole as raw material and then a sulfur nitrogen-containing heterocyclic borate ester（SNHB） lubricant additive was synthesized using BTE as raw material. The structures of BTE and SNHB were characterized by FTIR and elemental analysis. The solubility of BTE and SNHB in rapeseed oil were tested and the thermal stabilities of them were studied by thermal analysis. The hydrolytic stabilities of SNHB were also determined. The friction reducing,anti-wear and load-carrying capacities of BTE and SNHB were investigated by four-ball test. The surface morphology and the elemental composition of the tribofilms were investigated using scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDS）,respectively. The results revealed that the synthesized products were the target compounds of BTE and SNHB,and they completely dissolved in the rapeseed oil and thus had good oil soluble properties. The decomposition temperature of SNHB and BTE ranged from 270.50℃ to 396.01℃,and from 253.04℃ to 326.83℃,respectively. Both SNHB and BTE had good thermal stability,and SNHB was better. SNHB was not hydrolyzed over 7 days,while triisopropyl borate（a commercially available borate product） was hydrolyzed completely within 10 min,so SNHB had better hydrolytic stability under the same experimental conditions. SNHB exhibited superior tribological performances to BTE under different test loads and additive concentrations.