Method for preparing nano copper powder

Abstract

The invention discloses a method for preparing nano copper powder, which comprises the following steps of: compounding copper sulfate, lauryl sodium sulfate and polyoxyethylene sorbitan monooleate in a molar ratio of 1:0.5-2:0.05-0.3, dissolving the mixture in water, blending the aqueous solution and lauryl mercaptan-containing benzene solution in a molar ratio of copper sulfate to lauryl mercaptan of 1:0.5-2, and uniformly stirring; pouring the emulsion fluid into an electrolytic bath, taking pure copper as an anode and stainless steel as a cathode, and regulating the pH value to between 0.5 and 4; supplying direct current to the anode and the cathode to ensure that the lauryl mercaptan dissolved in an electrolyte performs in-situ clad on precipitated copper atoms, the generated copper powder loosely attaches to the surface of the cathode, copper ions near the anode are continuously migrated to the place near the cathode under the action of diffusion and directional migration of electric charge at the same time, and the electrolytic time is 30 to 120 minutes; adding the cathode to which the copper powder is attached into absolute ethyl alcohol, and putting the cathode in an ultrasonic cleaner for desorption by using ultrasonic waves for 5 to 20 minutes to obtain dark purple copper solution; and filtering the solution, and drying the filtrate for 1 to 3 hours at the temperature of between 60 and 100 DEG C in a vacuum environment to obtain brown powder, namely a nano copper composite.

Description

technical field [0001] The invention relates to an electrochemical preparation method of nanometer copper powder. Background technique [0002] At present, the nano-copper powder prepared by electrolysis has high purity, and its shape is mostly dendritic. It has good pressing performance and sintering performance, and has been widely used in powder metallurgy, atomic energy, chemical industry and new alloy materials. However, compared with the liquid phase reduction method, the copper powder produced by the electrolytic method has a coarser particle size and a more dispersed particle size composition. When copper powder of a certain particle size is required, a classification (sieving) method must be used to meet the requirements, which prolongs the production process. The production cycle is shortened, the cost of the product is increased, and the activity of the powder is reduced during the turnover and processing process, which has an adverse effect on the sintering perfo...

AI Technical Summary

Problems solved by technology

However, compared with the liquid phase reduction method, the copper powder produced by the electrolytic method has a coarser particle size and a more dispersed particle size composition. When copper powder of a certain particle size is required, a classification (sieving) method must be used to meet the requirements, which prolongs the production process. The production cycle is shortened, the cost of the product is increased, and the activity of the powder is reduced during the turnover and processing process, which has an adverse effect on the sintering performance

The nano-copper powder prepared by the usual electrochemical method is an unstable substance. They are easy to react with the ambient atmosphere and denature, and the particles are easy to interact and agglomerate. The dispersion liquid is usually difficult to maintain stability for a long time, which greatly limits its application range.

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