A polyhedral copper powder and a method for preparing the same

By using a complexing agent of trisodium citrate and alanine and pre-alkalization treatment, the problem of difficulty in controlling the morphology and crystal structure of copper powder in the liquid-phase reduction method was solved, and polyhedral copper powder with narrow particle size distribution and good dispersibility was prepared, thus improving the conductivity of copper powder.

CN122746475APending Publication Date: 2026-09-15CHONGQING MANNSTE NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202611157697.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-31
Publication Date
2026-09-15

AI Technical Summary

Technical Problem

When preparing copper powder using the existing liquid-phase reduction method, it is difficult to achieve precise control over the morphology and crystal structure of the copper powder. The crystal growth rate is uncontrollable, and conventional processes require the addition of dispersants, which leads to impurities affecting the powder properties.

Method used

Polyhedral copper powder was prepared by using a composite complexing agent composed of trisodium citrate and alanine, through pre-alkalization treatment and rapid mixing process, to control the crystal face growth of copper powder and avoid the use of dispersants.

Benefits of technology

Precise control of copper powder morphology and crystal structure was achieved, resulting in polyhedral copper powder with narrow particle size distribution and good dispersibility, thus avoiding the negative impact of dispersant residue on conductivity.

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Abstract

The application discloses polyhedral copper powder and a preparation method thereof. The application adopts a composite complexing agent composed of trisodium citrate and alanine, and the two components respectively play different complexing and crystal face regulating functions, thereby producing a synergistic technical effect. Trisodium citrate as a main complexing agent forms a stable complex with copper ions, effectively controls the concentration of free copper ions in a solution, and makes a reduction reaction proceed under mild and controllable conditions; alanine molecules are coordinated with copper ions through amino groups and carboxyl groups, and are selectively adsorbed on copper crystal faces at the same time, thereby affecting the relative growth rates of different crystal faces and guiding the growth of crystals in a polyhedral near-spherical direction. The synergistic cooperation of the two complexing agents not only guarantees sufficient complexing strength to stabilize the reaction process, but also gives flexibility to the morphology regulation of the copper powder. The composite complexing system can maintain good dispersibility without relying on any dispersant, and fundamentally avoids the negative influence of dispersant residues on the conductive performance of the copper powder.
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