W/O微乳液法制备表面修饰纳米氟化镧润滑油添加剂  

Preparation of Additive Containing LaF_3 Nanoparicles with In Stu Surface Modification in W/O Microemulsion System

作　　者：周晓龙[1] 张志刚[1] 余国贤[1] 金亚清[1] 

机构地区：[1]华东理工大学石油加工研究所,上海200237

出　　处：《润滑与密封》2006年第12期37-40,共4页Lubrication Engineering

基　　金：国家重大基础研究前期研究专项项目(2004CCA05400);上海市科研计划项目(0352nm027)

摘　　要：采用聚异丁烯丁二酰亚胺T152／S-80复合表面活性剂（w（Span80）：w（Tween20）=2：3（质量比））／异丁醇／500SN基础油／氟化铵水溶液W／O微乳液体系构建微反应器，通过原位表面修饰制备了含纳米LaR粒子的液体润滑油添加剂，同时，采用洗涤法制备了干粉纳米LaF3.采用X-射线衍射仪（XRD）和透射电镜（TEM）分析了纳米LaF3粒子的结构和形貌。分别将液体添加剂和干粉加入基础油中，采用离心沉降法考察了不同后续分离方法得到的纳米粒子在基础油中的分散稳定性，用四球机考察了它们的摩擦学性能，最后采用扫描电子显微镜（SEM）观察了磨斑表面形貌。结果表明：所构建的微反应器制备的颗粒状纳米LaF3平均粒径在10—15nm之间；纳米粒子在基础油中的分散稳定性对其摩擦学性能影响很大，液体添加剂巾的纳米粒子在基础油中的分散稳定性和摩擦学性能大大高于下粉粒子；液体添加剂中的表面活性剂不仅有利于纳米粒子在基础油中的稳定分散而且有减摩作用。The microreactor was constructed in the polyisobutylene succinimide T152/the compound surfactant S-80（ w （Span80） ： w （ Tween20 ） = 2：3 ） / isobutanol/500SN base oil/2% （ mass fraction ） NH4 F aqueous solution water-in-oil microemulsion, and a lubricant additive containing LaF3 nanoparicles with in stu surface modification was prepared in the W/ O microemulsion system,while preparing powder LaF3 nanoparticles. Surface-modified LaF3 nanoparticles were characterized by X-ray diffraction （XRD） and transmission electron microscopy （ TEM ）. The liquid additive and the power were respectively added into base oil. Dispersing stability of LaF3 nanoparticles in the base oil was measured by centrifugal settling. Tribological behaviors of LaF3 nanoparticles in the base oil were examined in a four-ball machine. The wear scars of steel balls were investigated by scanning electron microscopy （SEM） morphology. Results show that the built microreactor can be used to prepare the granular LaF3 nanoparicles of 10 - 15 nm in stu modified by T154. The dispersing stability of LaF3 nanoparticles in the base oil has an important impact on their tribological properties, and the LaF3 nanoparticles in the liquid additive have better dispersing stability and tribological behaviors in the base oil than the LaF3 nanoparticles in power. The surfactants in the liquid additive can improve the dispersing stability of LaF3 nanoparticles in the base oil, and reduce abrasion.

关 键 词：W/O微乳液 氟化镧 纳米粒子 分散稳定性 摩擦学性能 

分 类 号：TQ564.42[化学工程—炸药化工]