On-line coating preparation method and device of nano copper powder

Abstract

The invention provides an online coating preparation method of nanometer copper powder, comprising: under vacuum conditions, evaporating and gasifying copper-based metal raw materials to form gaseous metal copper; placing gaseous metal copper in an inert gas and an aerosol coating agent Condensation is carried out in a mixed atmosphere; wherein, the aerosol coating agent is an aerosolized coating agent solution. Using the above-mentioned method of the present invention, the formation and coating of nano-copper powder are directly integrated in one step, avoiding the oxidation of the coating-type metal nano-powder prepared by two-step or multi-step method in the transfer process; and, The particle size and distribution of copper-based nanopowder can be easily controlled by adjusting the evaporation temperature, gas pressure and inert gas flow rate; and the evaporation-condensation process is carried out in an inert atmosphere and coated with an organic coating agent , the prepared copper-based nano-powder has no pollution and excellent oxidation resistance, which improves the quality and ease of use of the copper-based nano-powder.

Description

technical field [0001] The invention belongs to the technical field of nano-material preparation, and in particular relates to an online coating preparation method and device of nano-copper powder. Background technique [0002] Nano-copper powder is an important functional component in products such as conductive ink, conductive paste, catalysis and anti-wear lubricating oil. The existing industrial large-scale preparation of nano-copper powder is mostly carried out by physical methods, mainly including wire electric explosion method and heating evaporation-condensation method. Among them, the metal wire electric explosion method is to fix the copper wire in a reaction chamber filled with inert gas, add two electrodes at both ends of the copper wire, and connect them with a large capacitor to form a loop, and apply a strong force to the copper wire instantly. The pulse current melts and vaporizes the copper wire in a short time, discharges and explodes at the moment the cop...

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Problems solved by technology

[0003] However, due to the large specific surface area and high activity of nano-copper powder, it is easy to oxidize or even spontaneously ignite when exposed to air, causing inconvenience in packaging, storage, transportation and use; therefore, it is generally necessary to carry out surface passivation treatment on the prepared nano-copper powder.

At present, the more commonly used method is to introduce hydrocarbon gas such as methane, acetylene or propylene in the preparation process of nano-copper powder, decompose and carbonize under the action of electric arc or laser to provide carbon source, and carbon-coat nano-copper powder. The disadvantage is that in addition to obtaining carbon-coated nano-copper powder, there are also more nano-carbon material particles

[0004] In order to make up for the defects of the usual practice, the CN102009948A invention patent adopts the method of mechanical stirring to coat a layer of organic matter on the surface of the nanomaterial before the nanomaterial contacts the air; in the implementation, its special equipment is used; an additional coating device is required, and the cost increases , The operation is complicated, so it is not practical

In the invention patent of CN1792127A, it is proposed to use organic acid to remove oxides on the surface of nano-copper powder, and then use organic matter to treat the surface of nano-copper powder to form a protective film on the surface of nano-copper powder to block oxygen to improve the oxidation resistance of nano-copper powder ; This method carries out precise control of process conditions in the implementation process, and finally achieves the goal, which is difficult to control

Therefore, in the existing practice, it is impossible to directly produce large quantities of coated copper-based nanopowders, and the preparation is carried out in multiple steps, which reduces the quality and ease of use of copper-based nanopowders

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