Preparation method of stable type compound nano anti-wearing agent

Abstract

The invention discloses a preparation method of a stable type compound nano anti-wearing agent, and belongs to the technical field of preparation of lubricating oil additives. The preparation method comprises the following steps: firstly, enabling nano molybdenum disulfide to react with n-butyl lithium to obtain pretreated molybdenum disulfide; carrying out ultrasonic dispersion on the pretreated molybdenum disulfide and mercaptoethylamine; inserting the n-butyl lithium into a molybdenum disulfide sheet layer; stripping the molybdenum disulfide sheet layer in an ultrasonic treatment process, so as to expose an active group of the molybdenum disulfide; loading the mercaptoethylamine, and reacting with maleic anhydride and ethanol, so as to increase the lipophilic property of the molybdenum disulfide; coating the surface of the molybdenum disulfide with maleate, so that molybdenum disulfide powder is difficultly gathered, and the stability and uniformity are improved; finally, stirring with modified nano boron nitride, dispersing, and drying to obtain the anti-wearing agent. The anti-wearing agent prepared by the method has relatively good anti-wearing performance, and also has excellent stability and dispersity; the anti-wearing agent has no layered precipitation and no nano agglomeration phenomenon; after the anti-wearing agent is added into lubricating oil, the lubricating performance can be remarkably improved; the anti-wearing agent has relatively good application prospect.

Description

technical field [0001] The invention discloses a preparation method of a stable composite nano anti-wear agent, belonging to the technical field of lubricating oil additive preparation. Background technique [0002] According to statistics from international authoritative organizations, friction has lost about one-third of the world's primary energy. Wear is one of the three most important forms of damage and failure of materials and equipment. Lubrication is the most important way to reduce friction, reduce or avoid wear. effective technology. In the traditional lubrication theory, lubrication is divided into liquid lubrication and boundary lubrication. The two metal surfaces that are in relative motion are completely separated by lubricating oil film, and there is no direct contact between the metals. This lubrication state is called liquid lubrication; as the load increases, the thickness of the oil film between the metal surfaces gradually decreases. When the load incre...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: the existing anti-wear agent is easy to be hydrolyzed and delaminated in humid climate, the uniformity and stability are poor, and long-term use will produce nano-particle aggregation, which will cause new wear and tear on the parts Defects, provide a method of treating nano-molybdenum disulfide with n-butyllithium to make its sheets peel off, and then modify molybdenum disulfide with mercaptoethylamine to make its surface have polar groups, and then combine with horse Grafting with anhydride, and finally mixing with modified nano-boron nitride to prepare a stable composite nano-antiwear agent, the present invention firstly reacts nano-molybdenum disulfide with n-butyllithium-n-hexane solution, and feeds in nitrogen to stir and centrifuge. Obtain pretreated molybdenum disulfide, then ultrasonically disperse it with mercaptoethylamine and water, insert n-butyllithium between the molybdenum disulfide sheets, and the molybdenum disulfide sheets are peeled off during ultrasonication, making the molybdenum disulfide active The group is exposed, and then loaded with mercaptoethylamine to make the surface have a variety of active groups, and then react with maleic anhydride and ethanol to increase the lipophilic performance of molybdenum disulfide, and the surface of molybdenum disulfide is covered with maleic acid Ester coating makes it difficult for molybdenum disulfide powder to aggregate, increase stability and uniformity, and then mix nano-boron nitride powder with silane coupling agent and monomethyl oxalate, and graft disulfide with maleic anhydride Molybdenum is stirred and dispersed, and dried to obtain a stable composite nano-antiwear agent. The antiwear agent prepared by the present invention has better antiwear performance, and at the same time has excellent stability and dispersibility, and the antiwear agent does not layer and precipitate , No nano-agglomeration phenomenon, adding it to lubricating oil can significantly improve its lubricating performance, and has a good application prospect