Method for preparing flaky copper powder with controllable particle size through chemical synthesis and flaky copper powder

Through chemical synthesis, copper powder with controllable particle size and high proportion of sheet particles is prepared by using specific concentrations of copper source aqueous solution and temperature control, combined with polyvinylpyrrolidone, cyclodextrin and ascorbic acid, and the existing technology is solved. The problems of unstable copper powder particle size and environmental pollution have achieved low-cost and environmentally friendly industrial production.

CN119187550APending Publication Date: 2024-12-27JIYUAN XINGHAN NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411319264.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-22
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

It is difficult to prepare copper powder with controllable particle size and high proportion of sheet particles in the prior art. Physical ball milling method is prone to bring in impurities and has high cost. The reducing agent commonly used in chemical synthesis methods is toxic and has serious environmental pollution.

Method used

By chemical synthesis, the copper source aqueous solution with a copper ion concentration of 0.5-1.5 mol/L was used to control the heating rate, and polyvinylpyrrolidone and cyclodextrin were added during the heating process, and then ascorbic acid was added as a non-toxic and environmentally friendly reducing agent. The reaction conditions were adjusted to prepare copper powder with an average particle size of 1-8 μm and a flake-like particle content of 35-60%.

Benefits of technology

It realizes precise particle size control of copper powder, reduces the difficulty of impurities introduction and waste liquid treatment, and has a mild process and low cost, making it suitable for large-scale industrial production.

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Abstract

The invention discloses a method for preparing flaky copper powder with a controllable particle size through chemical synthesis, which comprises the following steps: S1, preparing a copper source aqueous solution with a copper ion concentration of 0.5-1.5 mol / L, and heating the copper source aqueous solution to 60 DEG C at a heating rate of 1-2 DEG C / min; s2, the copper source water solution obtained in the step S1 is heated to 68-80 DEG C at the heating rate of 1.0-3.5 DEG C / h, polyvinylpyrrolidone is added into the copper source water solution in the heating process and evenly dispersed, then cyclodextrin is added and evenly dispersed, heat preservation is conducted for 25-35 min under the stirring condition after feeding is completed, and a reaction solution is obtained; and S3, a reducing agent is added into the reaction solution obtained in the step S2 and evenly dispersed, the molar ratio of the input amount of the reducing agent to the copper ions is 1: (1.2-1.8), the heat preservation reaction is conducted for at least 3 h, cooling and separation are conducted, and the copper powder with the average particle size being 1-8 microns and the flaky particle content being 35-60% is obtained. The invention correspondingly provides the flaky copper powder prepared by the method.
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Citation Information

Patent Citations

  • Preparation method and application of micron copper powder

    CN114749677A

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