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Flower-like spherical silver powder preparing method

A technology of spherical and silver powder, which is applied in the field of preparation of flower-shaped spherical silver powder, can solve problems such as poor sphericity of silver powder, and achieve the effects of no environmental pollution, simple process, and convenient operation

Inactive Publication Date: 2013-09-04
昆山西微美晶电子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above preparation process, VC is used as a reducing agent to prepare flower-shaped silver powder, and most of the time it is necessary to add a polymer protective agent to promote the formation of flower-shaped silver powder, and the prepared silver powder has poor sphericity

Method used

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  • Flower-like spherical silver powder preparing method
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  • Flower-like spherical silver powder preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] First prepare silver nitrate solution and reducing agent solution: weigh 1g of silver nitrate and dissolve in deionized water to 50ml, add 0.1g of maleic acid, weigh 1.5g of ferrous sulfate and dissolve in deionized water to 50ml. Both were cooled to 15°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. Centrifuge, wash with deionized water 3 times, then wash 2 times with absolute ethanol, and vacuum dry at 50°C to obtain silver powder. The obtained silver powder is as figure 1 As shown, it has better sphericity, average particle size of 2.0μm, more pieces, uniform distribution and good dispersion.

Embodiment 2

[0022] Preparation of silver nitrate solution and reducing agent solution: Weigh 2 g of silver nitrate and dissolve it in deionized water to 50 ml, add 0.05 g of trisodium citrate, weigh 5 g of ferrous sulfate and dissolve it in deionized water to 50 ml. Both were cooled to 8°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. Centrifuge, wash three times with deionized water, then wash twice with absolute ethanol, and vacuum dry at 70°C to obtain silver powder. The obtained silver powder is as figure 2 As shown, it has better sphericity, average particle size of 3.0 μm, more pieces, uniform distribution and good dispersion.

Embodiment 3

[0024] Preparation of silver nitrate solution and reducing agent solution: Weigh 2.5g of silver nitrate and dissolve it in deionized water to 50ml, add 0.01g of trisodium citrate and 0.01g of phthalic anhydride, weigh 8g of ferrous sulfate with deionized Dissolve in water to a volume of 50ml. Both were cooled to 0°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. Centrifuge, wash three times with deionized water, then wash twice with absolute ethanol, and vacuum dry at 80° C. to obtain silver powder. The obtained silver powder is as image 3 As shown, it has good sphericity, the average particle size is 3.0 μm, the number of pieces is large, the distribution is uniform, the dispersion is good, and the purity is high.

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Abstract

The invention discloses a flower-like spherical silver powder preparing method which includes steps that: (1) 1-50g / L silver nitrate solutions and 1-200g / L ferrous sulfate reductant solutions are prepared; (2) complexing agents are added into the silver nitrate solutions and the silver nitrate solutions with the complexing agents are evenly mixed, wherein the complexing agents are binary and n-nary (n>2) organic acids, organic acid anhydrides or organic acid salts, the ratio of carboxyl group concentration and silver ion concentration of the mixed silver nitrate solutions is 0.1:1-1:1, and the silver nitrate solutions and the ferrous sulfate reductant solutions are cooled to be at 0-20 DEG C; (3) reductants are added into the silver nitrate solutions and are continuously stirred until the color of the solutions does not change any more; and (4) deionized water is used for washing for several times after centrifugal separation or natural setting, absolute ethyl alcohol is used for washing for several times, and then the silver nitrate solutions are dried in vacuum on the condition of 0-80 DEG C to obtain flower-like spherical silver powder. The flower-like spherical silver powder obtained in the flower-like spherical silver powder preparing method has good sphericity degree and has a rough surface and narrow particle size distribution, and the number of pieces of the flower-like silver powder can be freely adjusted.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a preparation method of flower-shaped spherical silver powder. Background technique [0002] Micro-nano materials have been widely studied because of their physical and chemical properties different from their macroscopic physical states. Among them, micro-nano silver powder has attracted special attention due to its convenient preparation method and unique electrical, thermal, optical, and catalytic properties. Micro-nano silver powder is generally prepared by wet chemical method. At present, people can prepare micro-nano silver powder in different shapes, such as sphere, cube, triangle, cube, flake, flower, wire and branch. Among them, the flower-shaped micro-nano silver powder is favored by people because of its unique physical structure and physical and chemical properties. In terms of micro-nano flower-shaped spherical silver powder, some people have also done some ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 蔡雄辉
Owner 昆山西微美晶电子新材料科技有限公司
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