KR-102963435-B1 - Manufacturing method of spherical copper powder

Abstract

The present invention relates to a method for manufacturing spherical copper powder capable of efficiently producing high-quality copper powder with a controlled spherical particle shape. In one embodiment, the manufacturing method can achieve a high reaction rate under mild reaction conditions and can provide spherical copper powder having a uniform particle distribution.

Inventors

• 문종태
• 유병환
• 박윤수
• 원형일
• 김현영
• 김나영

Assignees

• (주)호전에이블

Dates

Publication Date

20260513

Application Date

20251120

Claims (11)

1. A method for producing spherical copper powder comprising the step of reacting a first aqueous solution containing a copper precursor, a copper ion complexing agent, a nonionic surfactant, and a reaction activator with a second aqueous solution containing a reducing agent to produce spherical copper powder, wherein The above reaction activator is selected from niobium (Nb), tantalum (Ta), gallium (Ga), arsenic (As), or lanthanide elements, and A method for manufacturing spherical copper powder, wherein the copper ions of the copper precursor and the reaction activator are used in a molar ratio of 1:0.00002 to 1:0.04.
2. delete
3. In paragraph 1, A method for manufacturing spherical copper powder, wherein the above-mentioned lanthanide element is selected from cerium (Ce), samarium (Sm), europium (Eu), gadolinium (Gd), and erbium (Er).
4. In paragraph 1, A method for producing spherical copper powder, wherein the concentration of copper ions in the total aqueous solution is 0.1 to 10 M.
5. In paragraph 1, A method for producing spherical copper powder, wherein the concentration of the reaction activator in the total aqueous solution is 1 to 1,000 ppm.
6. delete
7. In paragraph 1, A method for manufacturing spherical copper powder, wherein the average particle size of the spherical copper powder is 1 μm to 10 μm.
8. In paragraph 1, A method for producing spherical copper powder, wherein the copper ion complexing agent comprises a carboxylic acid compound or a polyamine compound.
9. In paragraph 1, A method for producing spherical copper powder, wherein the above-mentioned nonionic surfactant comprises polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, polysorbate, carboxymethyl cellulose, gelatin, dextran, or xanthan gum.
10. In paragraph 1, A method for producing spherical copper powder, wherein the copper precursor comprises CuSO₄ , Cu( NO₃ ) ₂ , or CuCl₂ .
11. In paragraph 1, A method for manufacturing spherical copper powder, wherein the above reaction is carried out at a temperature of 10 to 90 ℃ for 10 to 100 minutes.

Description

Manufacturing method of spherical copper powder The present invention relates to a method for manufacturing spherical copper powder. Copper powder is utilized as a core material in various industrial fields due to its excellent electrical and thermal conductivity, and has established itself as a critical component in applications requiring high performance, such as electronic devices, batteries, conductive pastes, and catalysts. With the recent advancement of technology across industries, there is a growing demand for copper powders with more precise physical properties. Conventional copper powders are primarily manufactured with angular, amorphous structures, which are prone to functional problems such as increased inter-particle contact resistance and reduced dispersibility. Due to these limitations, the need for spherical copper powder, which features uniform particle size and shape while ensuring high dispersibility and process suitability, is becoming increasingly prominent. Figure 1 is an FE-SEM analysis image of the spherical copper powder prepared in Example 1. Figure 2 is an FE-SEM analysis image of spherical copper powder prepared in Examples 2 to 9. Figure 3 is an FE-SEM analysis image of the angular amorphous copper powder prepared in Comparative Example 1. Figure 4 is an FE-SEM analysis image of the angular amorphous copper powder prepared in Comparative Example 2. Unless otherwise defined in this specification, all technical and scientific terms have the same meaning as generally understood by those skilled in the art to which the present invention pertains. The terms used in the description herein are merely for the purpose of effectively describing specific embodiments and are not intended to limit the present invention. The singular form used in this specification is intended to include the plural form unless specifically indicated otherwise in the context. Throughout this specification, the terms “comprising,” “having,” “containing,” or “having” any component mean that, unless specifically stated otherwise, other components are not excluded but may be included, and do not exclude elements, materials, or processes not additionally listed. The numerical ranges used herein include lower and upper limits and all values within the range, increments logically derived from the form and width of the defined range, all of which are limited, and all possible combinations of upper and lower limits of the numerical range defined in different forms. Unless otherwise specifically defined in this specification, values outside the numerical range that may occur due to experimental error or rounding are also included in the defined numerical range. Unless otherwise specifically defined in this specification, “about” may be considered to be a value within 30%, 25%, 20%, 15%, 10%, or 5% of the specified value. The present disclosure will be described in detail below. However, this is merely illustrative and the present disclosure is not limited to the specific embodiments described illustratively. The term "spherical" in this specification may mean not only a perfect sphere in which the surface is substantially equidistant from the center in the ordinary sense, but also a round shape that is close to a sphere and has no angles. One aspect of the present invention provides a method for manufacturing spherical copper powder that can efficiently produce high-quality copper powder with a controlled particle shape to be spherical. A method for manufacturing spherical copper powder according to one embodiment may use an aqueous solution comprising a copper precursor; a copper ion complexing agent; a nonionic surfactant; a reaction activator selected from niobium (Nb), tantalum (Ta), gallium (Ga), arsenic (As), or lanthanum group elements; and a reducing agent. Specifically, a method for manufacturing spherical copper powder according to one embodiment may include the step of manufacturing spherical copper powder by reacting a first aqueous solution containing a copper precursor, a copper ion complexing agent, a nonionic surfactant, and a reaction activator with a second aqueous solution containing a reducing agent. A method for manufacturing spherical copper powder according to one embodiment can provide spherical copper powder having a uniform particle distribution by satisfying the above composition combination, and can achieve a fast reaction rate and a high yield under mild reaction conditions. For example, the above reaction may be carried out at a temperature of 10 to 90 ℃, or 50 to 90 ℃, or 60 to 90 ℃, or 60 to 80 ℃ for 10 to 100 minutes, or 10 to 80 minutes, or 10 to 60 minutes, or 20 to 40 minutes. The above copper precursor can be used without limitation as long as it has high water solubility and can supply copper ions, and non-limiting examples may be Cu(II) precursors such as CuSO₄ , Cu( NO₃ ) ₂ , CuCl₂ , and CuCO₃ . The average particle size of the spherical copper powder produced by the method accor