摘要
分别选用十六烷基三甲基溴化铵(CTAB)、十二烷基二甲基苄基溴化铵(DDBAB)、十六烷基溴化吡啶(CPB)和双十二烷基二甲基溴化铵(DDAB)阳离子表面活性剂修饰的凹凸棒土作润滑脂稠化剂,制备凹凸棒土润滑脂,并对其理化性能和摩擦学性能进行测试。结果表明,阳离子表面活性剂修饰的凹凸棒土润滑脂均具有较好的热安定性和胶体安定性,有一定的腐蚀性,其中CTAB脂的综合指标最佳;DDAB含有的双烷基长链有利于凹凸棒土与基础油的亲和,CPB因共轭π键的电荷诱导作用降低了凹凸棒土表面的负电荷,这是凹凸棒土润滑脂具有优异润滑性能的原因。
Attapulgite（ATP） was modified by four cationic surfactants with different structures, which are cetyl trimeth- ylammonium bromide （ CTAB ）, dodecyl dimethyl benzyl ammonium bromide （ DDBAB ）, cetylpyridinium bromide （ CPB ） and didodecyldimethylammonium bromide （DDAB）. The grease was prepared using modified ATP as the thickener, and its physiochemical and tribological properties were tested. The results show that the structures and properties of the cationic surfactants have an important influence on the performance of the grease. From the aspect of physicochemical properties, four kinds of greases have better thermal stability and colloidal stability and have a certain degree of corrosion, in which CTAB grease has the best comprehensive performance. From the perspective of friction and wear behavior, DDAB and CPB greases possess better friction reducing properties, because the former contains a pair of long chain alkyl which helps to combine ATP with base oil,while the latter has conjugated π bond,which can reduce the negative charge of the surface of ATP by the induction effect of the charge. This is the reason that ATP greases have the excellent tribological properties.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第1期33-37,42,共6页
Lubrication Engineering
基金
中国科学院“百人计划”项目
