钻井液与完井液2023，Vol.40Issue(5)：578-585,8.DOI:10.12358/j.issn.1001-5620.2023.05.005
酰胺型润滑剂极性片段在铁表面的吸附作用
Adsorption of Polar Fragments of Amide Lubricants on Iron Surface
摘要
Abstract
DFT simulation was used to investigate the bonding effects of different polar segments on iron(001)surface.These polar segments were intercepted from the hydrophilic chain segments of oleic acid amide lubricants,include primary amine,secondary amine,amide,and hydroxyl.Results indicated that amide group,primary amine group,and hydroxyl group generated the most stable adsorption at the bridge site of Fe(001)surface,and secondary amino group generated the most stable adsorption on the top site of Fe(001)surface.The adsorption energy in descending order were primary amine group,secondary amino group,hydroxyl group,and amide group.Results of population analysis indicated that the orbital population of four polar groups changed during the process and obtained electrons from Fe(001)surface.Among them,secondary amino group obtained 0.16e electrons,primary amino and amide group obtained 0.09e electrons,and hydroxyl group obtained the lowest number of electrons at 0.08e.Results of DOS analysis showed that there exist DOS overlap between 2p orbitals of N and 3p、4s orbitals of iron,with chemical bonding effect.In the extreme pressure lubrication test and four ball friction test results,the lubrication coefficient reduction rate of oleic acid Diethylenetriamine is 83.6%,higher than 78.2%of oleic acid diethanolamide,and the wear scar radius is 287.184 μ m.The wear radius is lower than that of oleic acid diethanolamide.The experimental results indicate that surfactants containing amine and amide groups have better lubrication performance than surfactants containing hydroxyl groups.关键词
钻井液/酰胺型润滑剂/吸附能/电子云重叠/化学成键Key words
Drilling fluid/Amide type lubricant/Adsorption energy/Electron cloud overlap/Chemical bonding分类
能源科技引用本文复制引用
刘超,卢福伟,王伟,张顺从,唐玉华,王腾飞,郭婷婷..酰胺型润滑剂极性片段在铁表面的吸附作用[J].钻井液与完井液,2023,40(5):578-585,8.基金项目
国家科技重大专项"大型油气田及煤层气开发"(2017ZX05049003-007) （2017ZX05049003-007）
国家自然科学基金青年项目"油页岩空气/CO2交替注入原位燃烧催化改质机理及相间反应-传质规律研究"(42202182). （42202182）
