A method for large-scale preparation of highly uniform nano-copper powder

By controlling the viscosity and pH of the reaction system, and using a combination of copper salt solution, viscosity modifier, and short-chain amine, nano-copper powder with uniform particle size and good dispersibility was prepared. This solved the problems of uneven particle size, easy oxidation, and pollution of nano-copper powder in the existing technology, and enabled large-scale production.

CN120644676BActive Publication Date: 2026-06-30NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH
Filing Date
2025-07-30
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing liquid-phase chemical reduction methods for preparing nano-copper powder suffer from problems such as uneven particle size distribution, easy oxidation, and pollution and cleaning difficulties caused by the use of surfactants, making it difficult to achieve large-scale production.

Method used

By ultrasonically stirring a copper salt solution with a viscosity modifier, adding a short-chain amine to adjust the pH value, then adding a reducing agent and rapidly cooling, nano-copper powder with a particle size in the range of 200nm to 250nm can be prepared by controlling the viscosity and pH value of the reaction system, thus avoiding the use of long-chain surfactants.

Benefits of technology

The nano-copper powder exhibits uniform particle size distribution and good dispersibility, a smooth surface, and excellent conductivity. It simplifies the cleaning process, reduces environmental pollution, and is suitable for large-scale production.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120644676B_ABST
    Figure CN120644676B_ABST
Patent Text Reader

Abstract

This invention discloses a method for large-scale preparation of highly uniform nano-copper powder, comprising the following steps: 1. Dissolving copper salt in deionized water to obtain a clear solution; 2. Adding a viscosity modifier to the clear solution to obtain a mixed solution A; 3. Adding a short-chain amine solution to mixed solution A to obtain a mixed solution B; 4. Water bathing mixed solution B and adding a reducing agent to obtain a mixed solution C; 5. Rapidly cooling mixed solution C; 6. Centrifuging, washing, and vacuum drying to obtain nano-copper powder with a particle size of 200nm~250nm. The nano-copper powder obtained by this invention exhibits uniform particle size distribution, good dispersibility, smooth surface, and excellent conductivity. By changing parameters, the particle size of the nano-copper powder can be controlled, overcoming the current technical limitations of copper powder requiring surfactants, severe agglomeration, uneven particle size distribution, and difficulty in large-scale preparation. The process is simple, easy to operate, and highly reproducible, enabling the large-scale preparation of nano-copper powder.
Need to check novelty before this filing date? Find Prior Art