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Surface processing method of superfine silver powder

A technology for surface treatment and ultra-fine silver, applied in the field of powder surface modification and chemical preparation of ultra-fine silver powder, can solve the problems of difficult application, complicated manufacturing process and high cost, and achieve the improvement of physical and chemical properties, process performance improvement, and manufacturing simple craftsmanship

Inactive Publication Date: 2006-01-04
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are patents and literature reports abroad, such as U.S. Patent No. 5,413,617 and U.S. Pat. No. 6,368,378 disclose the surface manufacturing process of silver powder, but its manufacturing process is complicated, the cost is high, and it is difficult to apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: with 10kg chemically pure AgNO 3 Dissolve in the reduction tank, add polymer protective agent, add reducing agent under stirring condition, adjust system temperature and pH value until the ultrafine silver powder is precipitated, wash the powder with distilled water 8-10 times, and filter the water. Put the silver powder into a stainless steel ball mill tank, the filling amount is 50% of the inner volume of the stainless steel tank, add 6kg of φ3-30mm agate mixing balls, dissolve 0.5wt% stearic acid of the powder weight with absolute ethanol, and add it after the dissolution is completed In the ball mill jar, after adding an appropriate amount of absolute ethanol, seal the ball mill jar, take it out after ball milling for 8 hours, and the mill speed is 70 rpm. The ball powder is separated, the tank and the ball are washed, the powder liquid is combined, and dried in an oven at 70 ° C to obtain about 6.3 kg of surface-treated ultrafine silver powder.

Embodiment 2

[0009] Embodiment 2: with 10kg chemically pure AgNO 3 Dissolve in the reduction barrel, add polymer protective agent, add reducing agent under stirring condition, adjust system temperature and pH value, after the superfine silver powder is completely precipitated, wash the powder with distilled water for 8-10 times, and filter the water. Put the silver powder into a stainless steel ball mill tank, the filling amount is 60% of the inner volume of the stainless steel tank, add 7kg of φ3-30mm agate mixing balls, dissolve 0.6wt% cetyl alcohol of the powder weight with absolute ethanol, and add In the ball mill jar, after adding an appropriate amount of absolute ethanol, seal the ball mill jar, take it out after 12 hours of ball milling, and the mill speed is 70 rpm. The ball powder is separated, the tank and the ball are washed, the powder liquid is combined, and dried in an oven at 70 ° C to obtain about 6.3 kg of surface-treated ultrafine silver powder.

Embodiment 3

[0010] Embodiment 3: adopt 10kg chemically pure AgNO 3 Dissolve in the reduction barrel, add polymer protective agent, add reducing agent under stirring condition, adjust system temperature and pH value, after the superfine silver powder is precipitated, wash the powder with distilled water for 8-10 times, and filter the water. Put the silver powder into a stainless steel ball mill tank, the filling amount is 50% of the inner volume of the stainless steel tank, add 8kg of φ3-30mm agate mixing balls, dissolve 0.8wt% dodecanoic acid of the powder weight with absolute ethanol, and add it after the dissolution is completed In the ball mill jar, after adding an appropriate amount of absolute ethanol, seal the ball mill jar, take it out after ball milling for 10 hours, and the mill speed is 80 rpm. The ball powder is separated, the tank and the ball are washed, the powder liquid is combined, and dried in an oven at 70 ° C to obtain about 6.3 kg of surface-treated ultrafine silver po...

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Abstract

The surface processing method of superfine silver powder includes the following steps: preparing superfine silver powder via dissolving silver nitrate in reducing tub, adding polymer as protecting agent and reductant via stirring, regulating pH value to deposit silver grain, washing and pumping filtering; wet milling inside a stainless steel ball mill with mixed agate balls of 3-30 mm diameter and ball milling assistant; and separating the mill balls and milled powder, washing mill balls and ball mill with distilled water, merging powder and liquid and stoving. The silver powder thus prepare may be used in producing electronic slurry with greatly raised performance.

Description

technical field [0001] The invention relates to metal powder for electronic industry, in particular to the chemical preparation and powder surface modification of ultrafine silver powder for manufacturing electronic paste for electronic industry. Background technique [0002] As an important metal conductive powder material, ultra-fine silver powder is widely used in the manufacture of electronic paste. The powder properties of ultra-fine silver powder such as particle size and distribution, specific surface area, bulk specific gravity, tapped specific gravity, shape, etc. . Ultrafine silver powder with excellent performance is the key to prepare excellent silver paste. Ultra-fine silver powder has good electrical conductivity and excellent performance of not being easily oxidized, but it is expensive and has high application cost, and there is a problem of silver migration under the condition of high current and high voltage. In recent years, foreign countries have starte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 赵汝云刘婀娜
Owner SINO PLATINUM METALS CO LTD
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