Micron block and submicron spherical mixed silver powder and preparation method thereof

Through the synergistic effect of low molecular weight polyvinylpyrrolidone as a dispersant, a mixed silver powder of micron block and submicron spherical form was prepared, which solved the problem of insufficient control of silver powder in the prior art and achieved silver powder with high conductivity and good stacking structure.

CN119187547BActive Publication Date: 2025-04-01CHANGCHUN GOLD RES INST
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Patent Information

Application Number
CN202411702726.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2025-04-01
Estimated Expiration
2044-11-26

AI Technical Summary

Technical Problem

The prior art has insufficient morphological control when preparing silver powder, and cannot effectively combine spherical silver powder with sheet silver powder, which limits its application in low-temperature conductive pastes.

Method used

The primary chemical synthesis method is adopted, and the addition process of the dispersant is controlled by selecting low-molecular weight polyvinylpyrrolidone as the dispersant, so that the nano-silver crystals and the dispersant work together to promote the formation of silver powder particles in spherical and blocky shapes, forming a mixed silver powder powder with micro-block and sub-micron spherical shapes.

Benefits of technology

It realizes efficient preparation of mixed silver powder with micron block and submicron spherical shape, with good dispersion uniformity and tap density, and has excellent stacking structure after preparation into slurry and has excellent conductivity.

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Abstract

The present invention provides a micron block and submicron spherical mixed silver powder and a preparation method thereof, first preparing a silver salt solution, mixing a reducing agent, a dispersant and pure water to obtain a reducing agent solution, mixing a nano silver crystal suspension with a dispersant to obtain a base liquid; then simultaneously dropping the silver salt solution and the reducing agent solution into the base liquid to obtain a solution containing mixed silver powder; finally, washing the solution, performing solid-liquid separation, and drying and shaping treatment to obtain a micron block and submicron spherical mixed silver powder. The present invention selects low molecular weight polyvinyl pyrrolidone as a dispersant, and controls the addition process of the dispersant, so that the nano silver crystal and the dispersant play a synergistic role, and obtains a micron block and submicron spherical mixed silver powder with good dispersion uniformity and high tap density. After the mixed silver powder is slurried, the stacking structure is better and the conductivity is high; and the preparation method of the present invention simplifies the process steps, shortens the preparation time, and has industrial application prospects.
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