▎ 摘　　要

NOVELTY - Preparing perfluorotriethylamine-based high thermal conductivity lubricating nanofluid involves using nano-scale graphene filler, and no additive, and surface modifying which realizes the perfluorotriethylamine in the base liquid, uniformly dispersing, and achieving the improvement of the thermal conductivity of perfluorotriethylamine and the reduction of the friction coefficient under the typical friction pair. The graphene is oxidized to obtain a reactive oxygen terminal. The graphene oxide is prepared, where number of layers of graphene oxide is 1-5 layers, and the chip diameter is 10 nm-1 mu m, reacted at low temperature, medium temperature and high temperature to obtain graphene having an oxygen terminal. The surface of graphene fluoride, where graphene oxide and ultrapure water are uniformly dispersed in order to achieve uniform fluorination of graphene oxide surface, is first necessary to uniformly disperse graphene oxide into ultrapure water. USE - Method for preparing perfluorotriethylamine-based high thermal conductivity lubricating nanofluid. ADVANTAGE - The method enables to prepare perfluorotriethylamine-based high thermal conductivity lubricating nanofluid which enlarges the interlamellar spacing, reduces the force between layer, has strong repulsion effect between fluorine atom and layers, reduces grinding to improve the lubricating performance of nanofluid. DETAILED DESCRIPTION - Preparing perfluorotriethylamine-based high thermal conductivity lubricating nanofluid involves using nano-scale graphene filler, and no additive, and surface modifying which realizes the perfluorotriethylamine in the base liquid, uniformly dispersing, and achieving the improvement of the thermal conductivity of perfluorotriethylamine and the reduction of the friction coefficient under the typical friction pair. The graphene is oxidized to obtain a reactive oxygen terminal. The graphene oxide is prepared, where number of layers of graphene oxide is 1-5 layers, and the chip diameter is 10 nm-1 mu m, reacted at low temperature, medium temperature and high temperature to obtain graphene having an oxygen terminal. The surface of graphene fluoride, where graphene oxide and ultrapure water are uniformly dispersed in order to achieve uniform fluorination of graphene oxide surface, is first necessary to uniformly disperse graphene oxide into ultrapure water. The original cluster-like graphite is broken by ultrasonic vibration. The olefin group relies on the polar oxidizing group on the surface of the graphene to achieve uniform dispersion in ultrapure water. The fluorine modification of the graphene surface is performed in order to establish a fluorine terminal on the surface of the graphene oxide. The high temperature and high pressure environment of water heating promotes the reaction of the oxygen terminal with the hydrofluoric acid solution to achieve the controllable conversion of the oxygen terminal to the fluorine terminal. The graphene fluoride surface is cleaned by hydrothermal reaction by using Hydrofluoric acid solution, and form other by-products of non-uniform size. The reaction solution is filtered, washed, and the pH value of the aqueous solution is further adjusted to neutrality, and the obtained solid product is dried to obtain a fluorinated graphene sample. The fluorinated graphene perfluorotriethylamine nanofluid is prepared by dispersing dried fluorinated graphene in a perfluorotriethylamine solution to form a uniformly dispersed nanofluid to give fluorinated graphite. The sufficient energy of olefin and perfluorotriethylamine is used to break the agglomeration between fluorination and graphene oxide due to physical and chemical adsorption, and uniformly dispersed into perfluorotriethylamine, on the other hand, it is necessary to avoid excessive energy re-agglomerates dispersed fluorinated graphene. The energy and water temperature of the ultrasonic vibration need strictly controlled. The most direct and intuitive method to evaluate the stone. The stability method of the olefin-perfluorotriethylamine nanofluid is to judge the stability of the dispersion by observing the static settling time without standing. After standing for 2 weeks, no significant stratification occurs, to obtain fluorinated graphene-perfluorotriethylamine nanofluid which has good stability.