A kind of preparation method of flake silver powder

A flake silver powder and silver powder technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of affecting the conductivity of silver powder, affecting the purity of silver powder, and low dispersion, so that the preparation conditions are not harsh, the conductivity is guaranteed, and the vibration The effect of high solid density

Active Publication Date: 2022-03-25
湖南中伟新银材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of flaky silver powder mainly adopts the mechanical ball milling method. This method is to use the silver powder prepared by chemical method as a precursor, add grinding aid, and adopt the mode of ball milling to grind spherical or quasi-spherical silver powder into flaky silver powder. In the process of realizing the embodiment of the present application, it is found that due to the low degree of dispersion of the silver powder in the ball milling process, it is easy to agglomerate. In order to effectively control the particle size of the flake silver powder within a small range, it is necessary to add Graphite powder and other additives, and the addition of these additives brings impurities, which affects the purity of the silver powder, and ultimately affects the conductivity of the silver powder

Method used

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  • A kind of preparation method of flake silver powder
  • A kind of preparation method of flake silver powder
  • A kind of preparation method of flake silver powder

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preparation example Construction

[0039] The embodiment of the present invention provides a preparation method of flaky silver powder. In this method, the silver powder is first dispersed and then coated, and then the coated silver powder particles are ball-milled, which effectively prevents the silver powder particles from agglomerating during the ball-milling process. Agglomeration and agglomeration, the prepared flake silver powder has a small particle size and a high tap density.

[0040] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation manners.

Embodiment 1

[0042] A preparation method of flake silver powder, the steps comprising:

[0043] S1: Add the solvent to the silver powder raw material, mix well and then add the coating agent;

[0044] S2: injecting carbon dioxide into the product of step S1 for coating treatment;

[0045] S3: the product obtained in the solid-liquid separation step S2, and the solid product is subjected to ball milling;

[0046] S4: washing the product after ball milling in step S3 after sintering;

[0047] S5: Add a dispersant to the product obtained in step S4, stir evenly, and obtain the flaky silver powder after drying;

[0048] The solvent is an alcohol solution of bismuth halide.

[0049] In step S1, the mass ratio of the solvent to the silver powder raw material is (120-150):1. The coating agent includes at least one of sodium hydroxide or potassium hydroxide. The mass ratio of the silver powder raw material to the coating agent is 1:(30-50). In the solvent, the concentration of the halogen bi...

Embodiment 2

[0057] This example has actually prepared a kind of flaky silver powder, and specific steps include:

[0058] S1: Add the solvent to the silver powder raw material, mix well and then add the coating agent;

[0059] S2: injecting carbon dioxide into the product of step S1 for coating treatment;

[0060] S3: the product obtained in the solid-liquid separation step S2, and the solid product is subjected to ball milling;

[0061] S4: washing the product after ball milling in step S3 after sintering;

[0062] S5: Add a dispersant to the product obtained in step S4, stir evenly, and obtain the flaky silver powder after drying;

[0063] The solvent is ethanol solution of bismuth chloride.

[0064] The microscopic morphology of the silver powder raw materials used is as follows: figure 1 As shown, the shape is irregular and the surface is rough. The tap density is 4.2g / cm 3 .

[0065] In step S1, the mass ratio of the solvent to the silver powder raw material is 120:1. After t...

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Abstract

The embodiment of the present invention provides a preparation method of flaky silver powder. In this method, the silver powder is first dispersed and then coated, and then the coated silver powder particles are ball-milled, which effectively prevents the silver powder particles from agglomerating during the ball-milling process. Agglomeration and agglomeration, the prepared flake silver powder has a small particle size and a high tap density.

Description

technical field [0001] The invention belongs to the technical field of metal powder material preparation, and in particular relates to a preparation method of flake silver powder. Background technique [0002] Conductive paste is a basic functional material integrating materials, chemical industry and electronic technology. It is composed of two or more of conductive phase (conductive filler), binder phase (glass powder) and organic carrier through mixed rolling. A uniform paste was formed. The conductive paste usually has no conductivity at room temperature, but during the sintering process, the organic carrier volatilizes and burns, and the conductive particles diffuse and connect with each other to form a conductive path so that they have conductivity. At present, with the rapid innovation and development of electronics, information, and microelectronics technology, environmental protection, precision, and miniaturization have become the development direction of electron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/068
CPCB22F9/04B22F2009/043B22F1/068
Inventor 李勇施文峰
Owner 湖南中伟新银材料科技有限公司
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