Preparation method of perfluorotriethylamino high-heat-conducting lubricating nano-fluid

Abstract

The invention provides a preparation method of perfluorotriethylamino high-heat-conducting lubricating nano-fluid and belongs to the field of preparation of a composite liquid working medium of a fluid loop system for a spacecraft. Efficient heat exchange and effective lubrication of the fluid loop system are realized through preparing fluorinated graphene-perfluorotriethylamino nano fluid; a hydrothermal method is adopted and hydrofluoric acid is used as a fluorinating reagent to carry out fluorination on graphene oxide, so as to successfully prepare multilayered fluorinated graphene; experiment equipment is relatively simple and a preparation process is easy to operate. The fluorine ratio on the surface of graphene can be controlled and adjusted. The graphene subjected to fluorination treatment has good dispersity in a perfluorotriethylamino working medium; a dispersant is not needed so that the heat resistance of a heat transferring interface can be reduced and the heat conductivityof the nano-fluid is remarkably improved. Fluorine atoms are inserted into graphene lamellas, the inter-lamellar spacing is enlarged and the acting force between layers is reduced; meanwhile, a strong repulsive force action between the fluorine atoms is very good for sliding between the layers, and the wear-reduction lubricating performance of the nano-fluid can be remarkably improved.

Description

Technical field: [0001] The invention belongs to the field of preparation of composite liquid working medium in a fluid circuit system for spacecraft; in particular, it provides a preparation method based on perfluorotriethylamine nanofluid, which is characterized in that it can uniformly disperse graphite in superhydrophobic and oleophobic liquid working medium ene nanoparticles, so as to realize the efficient heat exchange and anti-friction lubrication of liquid working fluid. Background technique: [0002] High-efficiency heat transfer is an eternal theme in the development of fluid circuit technology, and the heat transfer efficiency of heat load and heat transfer fluid directly affects the scale and performance of the system. In order to realize the development of a high-efficiency fluid circuit cooling system for spacecraft, the working medium in the mechanical pump-driven fluid circuit cooling technology is required to have a high heat transfer coefficient, which can ...

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Problems solved by technology

[0005] However, although graphene usually has excellent thermal conductivity and lubricating properties, since the graphene with a complete structure is composed of stable six-membered cyclobenzene-like units, the surface is inert and has high chemical stability, and the relationship between graphene sheets The strong π-π interaction between them seriously affects the dispersion stability in the heat transfer fluid, especially for the special heat transfer fluid of perfluorotriethylamine, which is prone to aggregation, precipitation or agglomeration, which cannot be fully Graphene exerts high thermal conductivity and lubricating effect in perfluorotriethylamine

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