Silver micro powder as well as preparation method and application thereof

A technology for silver micropowder and silver particles, which is applied in the field of silver micropowder and its preparation, can solve the problems of complex process flow and low production efficiency, and achieve the effects of simple process, high production efficiency and reduction of silver powder content.

Inactive Publication Date: 2017-08-18
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sintered silver powder prepared in China generally has problems such as complicated process flow and low production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A silver micropowder is composed of silver particles with an average particle size of 1.4 μm, the particle size distribution of the silver micropowder is D50≤0.5 μm, D10≤0.2 μm, D90≤1.2 μm; the bulk density is 2.1 g / cm3, The tap density is 2.8g / cm3.

[0024] A kind of preparation method of silver micropowder, take silver nitrate as raw material to make by reduction reaction, comprise the steps:

[0025] (1) Prepare 2mol / L silver nitrate solution and 2mol / L reducing agent solution with deionized water;

[0026] (2) Put the dispersant in deionized water at 70°C and stir evenly;

[0027] (3) Add the above-mentioned silver nitrate solution, reducing agent sodium borohydride solution and dispersing agent methylcellulose solution together into the reaction kettle, use nitric acid and ammonia water as acid-base regulators to adjust the pH value of the mixed solution to acidity, and adjust the reaction kettle The internal temperature is 30°C, the rotation speed is 450r / min, a...

Embodiment 2

[0031] A silver micropowder is composed of silver particles with an average particle size of 1.3 μm, the particle size distribution of the silver micropowder is D50≤0.5 μm, D10≤0.2 μm, D90≤1.2 μm; the bulk density is 1.5 g / cm3, The tap density is 3.3g / cm3.

[0032] A kind of preparation method of silver micropowder, take silver nitrate as raw material to make by reduction reaction, comprise the steps:

[0033] (1) Prepare 2.5mol / L silver nitrate solution and 1mol / L reducing agent solution with deionized water;

[0034] (2) Put the dispersant in deionized water at 60°C and stir evenly;

[0035] (3) Add the above-mentioned silver nitrate solution, reducing agent phosphorous acid solution and dispersant gelatin solution into the reaction kettle together, use nitric acid and ammonia water as acid-base regulators to adjust the pH value of the mixed solution to 1-7, and adjust the temperature in the kettle The temperature is 35°C, the rotation speed is 500r / min, and the reaction i...

Embodiment 4

[0039] A silver micropowder is composed of silver particles with an average particle size of 1.3 μm, the particle size distribution of the silver micropowder is D50≤0.5 μm, D10≤0.2 μm, D90≤1.2 μm; the bulk density is 1.9 g / cm3, The tap density is 4.1g / cm3.

[0040] A kind of preparation method of silver micropowder, take silver nitrate as raw material to make by reduction reaction, comprise the steps:

[0041] (1) Prepare 2mol / L silver nitrate solution and 1.5mol / L reducing agent solution with deionized water;

[0042] (2) Put the dispersant in deionized water at 75°C and stir evenly;

[0043] (3) Add the above-mentioned silver nitrate solution, reducing agent hydrazine solution and dispersant sodium carboxymethylcellulose solution into the reaction kettle, and use nitric acid and ammonia water as acid-base regulators to adjust the pH value of the mixed solution to 1-7, Adjust the temperature in the kettle to 20°C to 50°C, the rotation speed to 400r / min, and stir for 0.5-3h;...

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Abstract

The invention relates to a method for preparing silver substances through a chemical reaction, in particular to silver micro powder as well as a preparation method and application thereof. The silver micro powder consists of silver particles of which the average particle size is 0.8-1.6 [mu]m, and the particle size distribution of the silver particles is that D50 is lower than or equal to 0.5 [mu]m, D10 is lower than or equal to 0.2 [mu]m, and D90 is lower than or equal to 1.2 [mu]m; the apparent density is 1.2-2.1 g/cm<3>; and the tap density is 2.8-4.5g/cm<3>. The preparation method of the silver micro powder comprises the following steps of adding a silver nitrate solution and a reducing agent solution to a reaction kettle together; using nitric acid and an ammonia solution as an acid-base adjusting agent, and performing a reaction under the condition of pH value being 1-7 and the temperature being 20-50 DEG C; performing filtering and performing washing; and after grinding for 1-3h, performing drying and performing screening so as to obtain the silver micro powder. According to the silver micro powder as well as the preparation method and the application thereof disclosed by the invention, sheet-form silver powder is directly prepared from silver nitrate, so that the process flow is short, the technology is simple, and the production efficiency is high; the prepared silver micro powder in irregular shape can be applied to products including solar battery conductor slurry, a conductive coating, conductive ink, conductive adhesive and the like; and under the premise that the same performance is achieved, the silver powder content can be effectively reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a method for preparing silver substances by chemical reaction, in particular to a silver micropowder and its preparation method and application. Background technique [0002] Metal ultrafine powder itself has superior catalytic properties, magnetic properties, electrical properties, etc., so it has more and more applications in aerospace, electronics, chemical medicine, powder metallurgy, etc. Among them, silver micropowder has good electrical and thermal conductivity, and is widely used in the electronics industry as a raw material for the production of conductive pastes for devices such as piezoelectric ceramics and solar cells. With the development of the electronics industry, the demand for conductive paste is increasing. At present, the sintered silver powder prepared in China generally has problems such as complicated process flow and low production efficiency. Therefore, how to simplify the production process of silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24
CPCB22F9/24B22F1/05
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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