Graphene oxide hybrid multi-wall self-lubricating micro-nano capsule and preparation method thereof

Abstract

The invention relates to a graphene oxide hybrid multi-wall self-lubricating micro-nano capsule and a preparation method thereof. An ionic liquid is adopted as a core material of the micro-nano capsule, and the structure of the wall material is polyurea / graphene oxide / (polyethyleneimine / graphene oxide)n inside out. The preparation method includes the steps: (1) preparing a mixture including graphene oxide, an ionic liquid and water; (2) mixing the mixture and an isocyanate monomer, then adding a chain extender, and performing heating for a reaction so as to obtain an ionic liquid-coated polyurea / graphene oxide double-walled micro-nano capsule; (3) preparing a mixed system containing polyethyleneimine, dopamine hydrochloride and a buffer solution; (4) mixing the micro-nano capsule obtainedin the step (2) with the mixed system, and performing a reaction at room temperature so as to obtain a dopamine-polyethyleneimine-modified polyurea / graphene oxide double-walled micro-nano capsule; and(5) mixing the micro-nano capsule obtained in the step (4) with a graphene oxide aqueous solution, and performing stirring for a reaction.

Description

technical field [0001] The invention relates to the technical field of self-lubricating materials, in particular to a graphene oxide hybrid multi-wall self-lubricating micro-nano capsule and a preparation method thereof. Background technique [0002] In petrochemical, aerospace, mechanical engineering and other fields, key components such as gears, bearings, pistons, etc. inevitably have friction and wear problems, which will not only shorten the service life of equipment, deteriorate equipment safety, and reduce production capacity, etc. It will also cause serious environmental pollution and major accidents. Therefore, it is of great significance to study anti-friction and wear-resistant materials. Polymer-based composites are widely used to replace many metal materials because of their excellent properties such as light weight, high strength, corrosion resistance, and easy processing. However, polymer materials have disadvantages such as poor heat transfer and wear resis...

AI Technical Summary

Problems solved by technology

[0006] (1) The particle size of the self-lubricating microcapsules reported in the existing literature is mostly in the range of tens to hundreds of microns. The larger particle size of the capsule will affect the mechanical properties of the composite material. materials to improve its mechanical properties and tribological properties, but the problem of difficult dispersion of nano-additives has not been effectively solved

[0007] (2) The reported microcapsule wall materials such as urea-formaldehyde resin (PUF), melamine resin (PMF), and polyurea (PU) have poor mechanical properties, and the capsules are easily broken during the preparation of resin-based composite materials, which seriously affects the composite material. self-lubricating effect; although polysulfone (PSF), polystyrene (PS) and other wall materials have good mechanical properties, their softening temperature is low (usually lower than 170°C), and they are used in high-temperature molding of resin matrix or in high-temperature environments limited in

Organic / inorganic hybrid wall materials can improve the thermal stability of microcapsules, but the proportion of inorganic components in the wall material structure in the organic-inorganic hybrid wall materials reported in the existing literature is small, and the content of inorganic components cannot be effectively Controlling, can not achieve the desired effect

Therefore, the existing microcapsule self-lubricating system cannot meet the purpose of reducing friction and wear resistance under conditions such as high temperature, high speed, and high load.

[0008] (3) Due to the weak interfacial bonding between the capsule and the resin matrix, the mechanical properties of the composite material added with the capsule are significantly reduced, which in turn affects the improvement of the friction and wear properties of the composite material, and the modification of the capsule wall material improves the interface between it and the resin matrix. There are few reports on the binding strength

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