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A nano-copper powder and anti-oxidation technology, which is applied in the anti-oxidation field of nano-copper powder, can solve the problems of powder oxidation and corrosion on the surface of copper powder, etc., and achieve the effect of blocking further corrosion, preventing oxidation, and good anti-oxidation performance
Active Publication Date: 2011-08-17
JIANGSU BOQIAN NEW MATERIALS
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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
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Embodiment 1
[0028] (1) Choose citric acid to dissolve in deionized water to prepare a 0.5% citric acid aqueous solution, and the pH of the solution is 2.
[0029] (2) Add the nano copper powder prepared by the PVD method to the above-mentioned citric acid aqueous solution, continue to stir, track the pH value of the solution, and add the citric acid aqueous solution to the slurry in time to maintain the pH value of the solution at 2~2.5 In the meantime, the stirring time is up to 1h and then stand still, and the supernatant liquid is filtered off to obtain copper powder slurry.
[0030] (3) Choose BTA as the copper powder corrosion inhibitor, and configure it as a 0.5% BTA aqueous solution, disperse the copper powder slurry of the above step (2) in it, stir for 1 hour and then stand, and filter the supernatant liquid to obtain copper Powder slurry.
[0031] (4) Use absolute ethanol to replace the copper powder slurry obtained in step (3) three times to obtain a copper powder slurry containing e...
Embodiment 2
[0037] (1) Choose oxalic acid to dissolve in deionized water and prepare an organic acid aqueous solution with a concentration of 0.5%. The pH of the solution is 2.
[0038] (2) Add copper powder to the above organic acid solution, keep stirring, track and measure the pH value of the solution, and add oxalic acid aqueous solution to the slurry in time to maintain the pH value of the solution between 2 and 2.5, and the stirring time is up to 1h After that, let it stand and filter the supernatant.
[0039] (3) Select triethanolamine as the copper powder corrosion inhibitor, and configure it as a 0.5% triethanolamine aqueous solution, disperse the copper powder slurry in it, stir for 1 hour and then stand still, filter the supernatant liquid to obtain copper powder slurry .
[0040] (4) The copper powder slurry was replaced with isopropanol three times to obtain a copper powder slurry containing isopropanol.
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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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