Antioxidation method of nano copper powder

Abstract

The invention discloses an antioxidation method of nano copper powder, which comprises the steps of: preparing an organic acid aqueous solution the mass concentration of which is 0.1 to 2 percent and controlling the pH within the range of 1 to 5; adding copper powder into the organic acid aqueous solution, mixing continuously, then standing for a certain time, and filtering the supernatant liquor; preparing copper powder anticorrosive solution the mass concentration of which is 0.1 to 2 percent; adding copper powder pulp into the copper powder anticorrosive solution, fully mixing, standing, filtering the supernatant liquor, and obtaining the copper powder pulp; carrying out metathesis on the copper powder pulp for 2 to 4 times by utilizing an organic solvent, and then classifying the copper powder pulp; weighing alcohol-soluble organic the weight of which is 0.1 to 5 percent of that of the copper powder in the copper powder pulp, dissolving the alcohol-soluble organic into an alcohol solvent, preparing a copper powder anticorrosive solution the concentration of which is 0.25 to 5 percent, and adding the obtained copper powder pulp into the copper powder anticorrosive solution and mixing for 0.5 to 2 hours. By the antioxidation method of nano copper powder, a layer of protective film can be covered on the surface of the nano copper powder and effectively isolate oxygen, thus the purpose of antioxidation of copper powder is achieved.

Description

Technical field [0001] The invention relates to an anti-oxidation method of nano copper powder. Background technique [0002] Nano copper powder (the particle size range is generally 100-1000nm) not only can be directly used as a catalyst in the chemical industry, but also an indispensable basic material for high-conductivity, high-strength nanomaterials. At present, there are many methods for preparing nano copper powder, which can be roughly divided into two categories: [0003] (1) Chemical method [0004] It mainly includes precipitation method, hydrothermal synthesis method, sol-gel method, etc. The purity of nano copper powder prepared by such chemical methods is low, the particle size of the preparation process is not easy to control, and the morphology is uneven, which severely restricts its application in the semiconductor industry. [0005] (2) Physical methods [0006] The PVD (Physical Vapor Deposition) method is currently a mature physical method for preparing metal nanop...

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Problems solved by technology

However, during the powder collection process of the PVD method, a small amount of water will be introduced into the system more or less, and some oxygen will also be attached to the system. As time goes by, copper powder, water and oxygen will form a primary battery and an electrochemical reaction will occur. Corrosion of copper powder surface, resulting in powder oxidation

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