Preparation technology of ultrafine copper powder

A technology of ultrafine copper powder and preparation process, which is applied in the preparation field of ultrafine copper powder, can solve the problems of large product particle size, limited application and promotion, complicated equipment, etc., and achieves the effects of reducing the generation of three wastes, simple process and cost reduction.

Inactive Publication Date: 2015-02-04
夏正付
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The preparation methods of ultra-fine copper powder include gas-phase steam method, γ-ray method, plasma method, mechanochemical method, liquid-phase reduction method, etc. Generally speaking, they can be attributed to physical and chemical methods. The gas-phase steam method has complex equipment and high cost. ; The γ-ray method product is difficult to collect; the energy utilization rate of the plasma method is low; the product prepared by the water atomization method has a large particle size and poor formability
As far as the chemical method is concerned, the copper powder prepared by the mechanochemical method is uneven, the particle size distribution is wide, and impurities are easily introduced; the electrolysis method consumes a lot of energy and costs high; the ammonium salt disproportionation method has a low yield; Simple and easy to produce industrially, but the reducing agents currently used are either highly toxic or costly
Just because of the above shortcomings, the application and popularization of these preparation methods are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1). Mix copper sulfate with ethylene glycol, add sodium hydroxide solution, and prepare a mixed solution with a copper concentration of 65g / L. The concentration of ethylene glycol is 75g / l. In the system, n(OH - ) and n(Cu 2+ ) ratio is 4:1.

[0030] 2). Heat the mixed solution to 185°C, condense and reflux volatilized ethylene glycol vapor at 110°C, and condense and recover the remaining glyoxal vapor at 25°C, and react for 5 hours.

[0031] 3). The reactant was separated from solid and liquid, washed, and dried in vacuum at 75°C for 3 hours to obtain ultrafine copper powder with a particle size of 0.8um, (D90-D10) / D50=0.75.

Embodiment 2

[0033] 1). Mix copper sulfate with ethylene glycol, add sodium hydroxide solution, and prepare a mixed solution with a copper concentration of 65g / L. The concentration of ethylene glycol is 75g / l. In the system, n(OH - ) and n(Cu 2+ ) ratio is 5:1.

[0034] 2).Heating the mixed solution to 200°C, condensing and refluxing the volatilized ethylene glycol vapor at 110°C, and condensing and recovering the remaining glyoxal vapor at 25°C, and reacting for 6 hours.

[0035] 3). The reactant was separated from solid and liquid, washed, and dried in vacuum at 75°C for 3 hours to obtain ultrafine copper powder with a particle size of 1.0um, (D90-D10) / D50=0.70.

Embodiment 3

[0037] 1). Mix copper sulfate with ethylene glycol, add sodium hydroxide solution, and prepare a mixed solution with a copper concentration of 40g / L. The concentration of ethylene glycol is 50g / l. In the system, n(OH - ) and n(Cu 2+ ) ratio is 5:1.

[0038] 2).Heating the mixed solution to 200°C, condensing and refluxing the volatilized ethylene glycol vapor at 110°C, and condensing and recovering the remaining glyoxal vapor at 25°C, and reacting for 6 hours.

[0039] 3). The reactant was separated from solid and liquid, washed, and dried in vacuum at 50°C for 6 hours to obtain ultrafine copper powder with a particle size of 0.65um, (D90-D10) / D50=0.80.

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Abstract

The invention provides a preparation technology of ultrafine copper powder. The preparation technology comprises the steps of mixing copper salt and ethylene glycol, and adding alkaline liquid to prepare a mixed solution with the copper concentration being 10-100g / L; heating the mixed solution to 150-250 DEG C, performing condensing backflow on volatilized ethylene glycol steam at the temperature of 100-150 DEG C, performing condensing recycling on residual ethylene glycol steam at the temperature of 20-30 DEG C for reaction for 1-10 hours; and performing solid-liquid separation and washing on reactants, and performing vacuum drying at the temperature of 50-100 DEG C to prepare the ultrafine copper powder. The technology is low in cost and simple in flow; the obtained ultrafine copper powder is small in particle size, the particle size is 0.3-1.5 microns, and the particle size distribution is narrow.

Description

technical field [0001] The invention relates to a preparation method of a powder material, in particular to a preparation process of ultrafine copper powder. technical background [0002] Ultrafine copper powder is an important industrial raw material due to its high surface activity and good electrical and thermal conductivity. It is mainly used in powder metallurgy, catalysts, lubricants, conductive coatings, and electromagnetic shielding materials. [0003] For example, ultra-fine copper powder has the advantages of small resistivity, low electromigration speed, and low price. It is one of the ideal substitutes for silver-palladium internal electrodes and can be used on MLCC internal electrodes. [0004] Application of ultrafine copper powder in conductive coatings. At present, the fillers of conductive coatings mainly include carbon-based, silver-based, copper-based, nickel-based and composite systems. As a conductive filler in coatings for electromagnetic wave shieldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 夏正付
Owner 夏正付
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