Method for preparing cubic nano copper powder

A technology of nano-copper powder and cubes, which is applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of uneven powder particle size, cumbersome operation steps, high heating temperature, etc., and achieve good oxidation resistance, simple process, The effect of low heating temperature

Active Publication Date: 2018-06-29
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +2
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Problems solved by technology

The existing liquid phase reduction method can be used to prepare cubic nano-copper powder, but the preparation method has high

Method used

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  • Method for preparing cubic nano copper powder

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Embodiment 1

[0029] (1) At 50°C, add 5g of stearic acid to 250mL, 0.04mol / L CuCl 2 In the ethanol solution, stir evenly with magnetic force to obtain CuCl 2 and a mixed solution of stearic acid;

[0030] (2) Configure the NaOH ethanol solution of 2mol / L, under the condition of 800r / min magnetic stirring, add the NaOH ethanol solution to the solution obtained in step (1) quickly at a speed of 0.7L / min, and adjust the pH of the solution to 12 , making Cu(OH )2 colloid;

[0031] (3) the colloidal solution gained in step (2) is poured in the three-necked flask, and normal pressure is logical N 2 Protect the gas, heat the colloidal solution while stirring, and heat it to an external temperature of 75°C, then add 6.4g of hydrazine hydrate dropwise into the three-necked flask, and stir at a constant temperature for 120min. After the reaction, a cubic nano-copper dispersion is obtained;

[0032] (4) Centrifuge the cubic copper powder dispersion obtained in step (3) to obtain the copper colloid...

Embodiment 2

[0034] (1) At room temperature, add 3 g of oleic acid to 100 mL of 0.1 mol / L CuCl 2 In deionized aqueous solution, stir evenly with magnetic force to obtain CuCl 2 Mixed solution with oleic acid;

[0035] (2) configuration concentration is the NaOH aqueous solution of 4mol / L, under the condition of 700r / min magnetic stirring, quickly add NaOH aqueous solution to step (1) gained solution with the speed of 1.2L / min, makes Cu(OH) 2 colloid;

[0036] (3) Pour the colloidal solution obtained in step (2) into a three-necked flask, pass argon as a protective gas, and stir the colloidal solution while heating until the external temperature is 80° C., then add 4 g dropwise to the three-necked flask Hydrazine hydrate, stirred at a constant temperature for 180min, and obtained a nano-copper dispersion after the reaction;

[0037] (4) Centrifuge the copper powder dispersion obtained in step (3) to obtain the copper colloid, wash it three times with deionized water, and vacuum dry to ob...

Embodiment 3

[0039] (1) At 50°C, add 3g of stearic acid to 200mL of 0.05mol / L CuSO 4 In ethanol solution, CuSO 4 and a mixed solution of stearic acid;

[0040] (2) configuration concentration is the KOH ethanol solution of 1.5mol / L, under the condition of 1000r / min magnetic stirring, with the speed of 1.9L / min, KOH ethanol solution is added in step (1) gained solution fast, the solution pH The value was adjusted to 12 to obtain Cu(OH) 2 colloid;

[0041] (3) Pour the colloidal solution obtained in step (2) into a three-necked flask, pass argon as a protective gas, heat the colloidal solution while stirring, and at the same time heat it to an external temperature of 75°C, and then add it dropwise to the three-necked flask 5g of hydrazine hydrate, stirred at a constant temperature for 300min, and obtained a nano-copper dispersion after the reaction;

[0042] (4) Centrifuge the copper powder dispersion obtained in step (3) to obtain the copper colloid, wash it three times with absolute et...

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Abstract

The invention belongs to the technical field of nanoscale copper powder preparation and provides a method for preparing cubic nano copper powder. The method comprises the steps that copper salt servesas a raw material, deionized water or absolute ethyl alcohol serves as a solvent, a stearic acid or oleic acid is added to a solution to serve as a protective agent and a dispersing agent, then a high-concentration alkali solution is added, the high-concentration alkali solution and the copper slat are made to generate copper hydroxide colloid, the pH of the solution is adjusted through the alkali solution, and the solution is made to be alkaline; and then, hydrazine hydrate serves as a reducing agent to be added to the prepared copper hydroxide colloid drop by drop, the mixture is heated atthe constant temperature of 20-90 DEG C, a reaction is performed for 10-300 minutes, and the cubic nano copper powder can be obtained. The copper powder in the prepared nano copper powder is in a cubeshape, particle size distribution is uniform, the average edge length is 100 nm, the yield is 90% or above, the dispersity is extremely high, the phenomenon of particle aggregation does not exist, and the cubic nano copper powder can be dispersed in water as well as in a weak solvent; and the method is simple in process, low in heating temperature, low in energy consumption and suitable for large-batch production.

Description

technical field [0001] The invention belongs to the technical field of nano-scale copper powder preparation, in particular to a preparation method of cubic nano-copper powder. Background technique [0002] Nano-copper powder refers to copper powder whose component phase or crystal grain size is less than 100nm in each dimension. Because the constituent phase or grain size is close to the molecular size, similar to other nano-metal powders, nano-copper powders also have size effects, quantum tunneling effects, surface effects, and volume effects, etc., thus showing many properties that are completely different from bulk metal copper. Specific properties, such as decreased melting point, increased surface energy, improved catalytic activity, greatly increased elongation, decreased electrical conductivity, etc. Nano copper powder is widely used as coating materials, catalysts, conductive materials, rocket nozzles, advanced solid lubricants, etc. [0003] Among them, cubic nan...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B22F1/00
CPCB82Y40/00B22F9/24B22F1/0553B22F1/054
Inventor 王建伟施静敏梁明会王立根张敬国肖伟程磊
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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