Preparation method of wear-resistant self-repairing sulfur-metal nanoparticles

Abstract

The invention discloses a preparation method of wear-resistant self-repairing sulfur-metal nanoparticles. The preparation method comprises the following steps of: slowly adding a metal salt into a thiol compound of which the temperature is 60-150DEG C; vigorously stirring to obtain viscous fluid; and cooling the viscous fluid to obtain a solid namely the sulfur-metal nanoparticles. The sulfur-metal nanoparticles prepared by the method is small in diameter which is between 5 and 20 nm, has a good effect of repairing great abrasions including scratches and the like, can generate a full chemical reaction at a repaired part due to the small diameter, and also has a good effect of repairing fine abrasions including surface abrasions and the like; the surfaces of the sulfur-metal nanoparticles are provided with sulfur-bearing radicals, so that agglomeration of the nanoparticles cannot be generated easily, the metal nanoparticles can be kept in a monodisperse state in a short period or a long period of time, and the stability of the metal nanoparticles in oil phase media including lubricating oil and the like is lasting. The preparation method is simple and feasible, the purity of the product is high, and raw materials are easy to obtain and low in price.

Description

technical field [0001] The invention relates to a method for preparing metal nanoparticles, in particular to a method for preparing anti-wear and self-repairing sulfur-metal nanoparticles, which belongs to the technical field of nanomaterials. Background technique [0002] Wear, corrosion, and fatigue are the three main forms of failure of mechanical materials. It is reported that about 1 / 3 of the world's primary energy is consumed by wear and tear, which brings huge economic losses: the annual economic loss caused by wear in the United States The loss exceeded 200 billion U.S. dollars, and our country also reached about 60 billion yuan. In many fields, especially in the field of automobile manufacturing, about 30% of the total energy of the engine is consumed by friction work, and the utilization rate of the total energy is low. Therefore, the development of anti-wear and metal self-repair technology is one of the ways to improve energy efficiency , is of great significanc...

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Problems solved by technology

Since the 1980s, related products have appeared on the market, such as Annetz metal anti-wear agent and special wear-resistant engine copper plating protection agent, etc., but the above-mentioned anti-wear agents containing nano-materials still have the following disadvantages: One is that the surface modification of nanomaterials is not complete, and the phenomenon of nanoparticle aggregation is easy to occur. The agglomerates produced by the agglomeration will become a new source of wear on metal surfaces such as engines, thereby further aggravating wear; The stability is not long-lasting, and only short-term dispersion can be obtained, while long-term quiescence will still cause agglomeration of nanoparticles; third, the repairing effect is relatively limited. The repair effect of larger wear such as scratches is better, while the repair effect of relatively fine wear such as opposite wear is poor; Fourth, impurities are easily introduced during the preparation process, resulting in impure nanomaterial products, and the purification steps are cumbersome

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