Flaky silver powder and preparation method thereof

Through one-step reduction method and template agent coating technology, sheet-like silver powder with narrow particle size distribution and good dispersion is prepared, which solves the problems of complex processes, toxic reducing agents and aggregation of silver powder in the existing technology, and achieves simplified process and efficient production.

CN120133537APending Publication Date: 2025-06-13HA SHEN TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510406787.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-02
Publication Date
2025-06-13

AI Technical Summary

Technical Problem

The existing preparation methods for flake silver powder have many steps and take a long time. The reducing agent used is toxic or harmful to the environment. There are agglomeration problems between the silver particles, resulting in large particle size distribution and poor dispersion.

Method used

By using one-step reduction method, the ascorbic acid aqueous solution, the template agent solution is mixed with the reaction solvent, and the silver nitrate solution is added to form the initial sheet silver powder, and then the sintering aid solution is added to coat it to control the morphology and sintering activity of the silver powder.

Benefits of technology

The production process is simplified and environmentally friendly. The obtained sheet silver powder has a narrow particle size distribution and uniform dispersion, which is suitable for low-temperature sintering.

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Abstract

The invention discloses flake silver powder and a preparation method thereof, and belongs to the technical field of silver powder. The preparation method of the flaky silver powder comprises the following steps: mixing a reducing agent solution, a template agent solution and a reaction solvent to obtain a first mixed solution; mixing a silver nitrate solution with the first mixed solution to obtain a second mixed solution with initial flake silver powder; and mixing the sintering aid solution with the second mixed solution so as to coat the initial flake silver powder. According to the method, the reducing agent solution and the silver nitrate solution are subjected to one-step reduction reaction in the presence of the template agent solution, the flaky silver powder can be obtained within a short time, the production process is simple and environmentally friendly, and large-scale production is facilitated; after the initial flake silver powder is obtained, the sintering aid solution is combined, and the morphology and sintering activity of the flake silver powder can be effectively controlled. The flaky silver powder obtained through the method is narrow in particle size distribution and uniform in dispersion, the proportion of flaky silver powder is high, and the flaky silver powder can be applied to low-temperature sintering.
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