Method for preparing nano copper powder

A technology of nano copper powder and copper sulfate, applied in the field of electrochemical preparation of nano copper powder, can solve the problems such as difficulty in maintaining stability of dispersion liquid for a long time, adverse effects on sintering performance, limited application scope, etc., and achieves low cost, small particle size, The effect of easy availability of raw materials

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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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 t...

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  • Method for preparing nano copper powder

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preparation example Construction

[0013] The present invention is a kind of preparation method of nanometer copper powder, and its steps are:

[0014] (1) The molar ratio of copper sulfate, sodium lauryl sulfate and polyoxyethylene sorbitan monooleate is 1: 0.5~2: 0.05~0.3, dissolved in water, and mixed with sulfuric acid The molar ratio of copper to dodecyl mercaptan is 1: 0.5~2 The above-mentioned aqueous solution is mixed with the benzene solution containing dodecyl mercaptan, and stirred evenly under the action of a magnetic stirrer and ultrasonic waves;

[0015] (2) Inject the evenly stirred emulsion into the electrolytic cell, use pure copper as the anode, stainless steel as the cathode, the area ratio of the anode and the cathode is 1:2-5, and the distance between the pole pieces is 30-70mm. The pH value is adjusted to 0.5-4;

[0016] (3) Direct current is applied to the electrode, so that the copper of the anode is continuously dissolved into the electrolyte, and the copper ions in the solution near t...

Embodiment 1

[0020] Take 5 g of anhydrous copper sulfate and dissolve it in 500 mL of distilled water.

[0021] Take 1 g of sodium lauryl sulfate, 5 mL of Tween 80, 15 mL of dodecyl mercaptan, and 20 mL of benzene, and stir evenly under the action of a magnetic stirrer and ultrasonic waves.

[0022] The above two solutions were mixed, mixed evenly under the action of a magnetic stirrer, and titrated with concentrated sulfuric acid until the pH value was 0.5.

[0023] The prepared emulsion is used as electrolyte, pure copper is used as anode, stainless steel mesh is used as cathode, the area ratio of anode and cathode is 1:2, the distance between pole pieces is 30mm, and the current density of cathode is 0.01A / cm 2 , direct current is applied to the electrode, so that the copper in the anode is continuously dissolved into the electrolyte, and the copper ions in the solution near the cathode are continuously precipitated and deposited on the cathode, and the dodecyl mercaptan dissolved in th...

Embodiment 2

[0026] Take 12.5 g of anhydrous copper sulfate and dissolve it in 500 mL of distilled water.

[0027] Take 1 g of sodium lauryl sulfate, 5 mL of Tween 80, 15 mL of dodecyl mercaptan, and 20 mL of benzene, and stir evenly under the action of a magnetic stirrer and ultrasonic waves.

[0028] The above two solutions were mixed, mixed evenly under the action of a magnetic stirrer, and titrated with concentrated sulfuric acid until the pH value was 4.

[0029] The prepared emulsion is used as electrolyte, pure copper is used as anode, stainless steel mesh is used as cathode, the area ratio of anode and cathode is 1:5, the distance between pole pieces is 45mm, and the current density of cathode is 0.2A / cm 2 , direct current is applied to the electrode, so that the copper in the anode is continuously dissolved into the electrolyte, and the copper ions in the solution near the cathode are continuously precipitated and deposited on the cathode, and the dodecyl mercaptan dissolved in th...

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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...

Claims

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Application Information

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IPC IPC(8): C25C5/02
Inventor 徐建林陈纪东
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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