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Method for preparing metal silver powder with high tap-density and high crystallinity degree

A technology of tap density and high crystallinity is applied in the field of preparation of metal silver powder with high tap density and high crystallinity. , Conducive to the effect of post-cleaning treatment and volume utilization

Inactive Publication Date: 2016-12-14
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the current liquid-phase production process of metal silver powder are poor repeatability of product performance, and the uniformity of silver powder particle size and surface morphology cannot meet the requirements.

Method used

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  • Method for preparing metal silver powder with high tap-density and high crystallinity degree
  • Method for preparing metal silver powder with high tap-density and high crystallinity degree
  • Method for preparing metal silver powder with high tap-density and high crystallinity degree

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Effect test

Embodiment 1

[0026] The method for the high tap density and high crystallinity metal silver powder prepared by the present embodiment may further comprise the steps:

[0027] Step 1. Preparation of silver nitrate solution: dissolving 10.8g of silver in 15mL of dilute nitric acid to obtain a silver nitrate solution; the mass purity of the silver is not less than 99.9%.

[0028] Step 2, preparation of additive solution: Add 0.68g of polyvinylpyrrolidone into 20mL of deionized water until completely dissolved to obtain a polyvinylpyrrolidone solution;

[0029] Step 3, preparation of oxidant solution: mix and stir the silver nitrate solution in step 1 and the polyvinylpyrrolidone solution in step 2 evenly, and adjust the pH value to 1 with ammonia water, then add deionized water to make it 100mL oxidant solution;

[0030] Step 4, prepare ascorbic acid solution: dissolve 13.2g of ascorbic acid in 50mL of deionized water, continue to add deionized water to dilute to 100mL after ascorbic acid is...

Embodiment 2

[0037] The method for the high tap density and high crystallinity metal silver powder prepared by the present embodiment may further comprise the steps:

[0038] Step 1. Preparation of silver nitrate solution: dissolving 10.8g of silver in 15mL of dilute nitric acid to obtain a silver nitrate solution; the mass purity of the silver is not less than 99.9%.

[0039] Step 2. Preparation of additive solution: Add 0.34g of starch to 20mL of deionized water until completely dissolved to obtain a starch solution;

[0040]Step 3, preparation of oxidant solution: mix and stir the silver nitrate solution described in step 1 and the starch solution described in step 2 evenly, adjust the pH value to 2 with ammonia water, and then add deionized water to constant volume to prepare 100 mL of oxidant solution;

[0041] Step 4, prepare ascorbic acid solution: dissolve 8.8g of ascorbic acid in 50mL of deionized water, continue to add deionized water to dilute to 100mL after ascorbic acid is co...

Embodiment 3

[0046] The method for the high tap density and high crystallinity metal silver powder prepared by the present embodiment may further comprise the steps:

[0047] Step 1, preparing a silver nitrate solution: adding 21.6g of silver to 40mL of dilute nitric acid to obtain a silver nitrate solution; the mass purity of the silver is not less than 99.9%.

[0048] Step 2, preparation of additive solution: add 1.7g of polyvinyl alcohol into 30mL of deionized water to completely dissolve to obtain a polyvinyl alcohol solution;

[0049] Step 3. Preparation of oxidant solution: mix and stir the silver nitrate solution in step 1 and the polyvinyl alcohol solution in step 2 evenly, adjust the pH value to 1 with ammonia water, and then add deionized water to make it 200mL oxidant solution;

[0050] Step 4, prepare ascorbic acid solution: dissolve 22.88g of ascorbic acid in 80mL of deionized water, continue to add deionized water to dilute to 200mL after ascorbic acid is completely dissolve...

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Abstract

The invention discloses a method for preparing metal silver powder with the high tap-density and high crystallinity degree. The method includes the steps that a silver nitrate solution and an addition agent solution are evenly mixed, the pH value is adjusted to be 0.1-3 by the adoption of ammonium hydroxide, and the solutions are prepared into an oxidizing agent solution in a constant volume mode; under the temperature condition of 20-40 DEG C, the oxidizing agent solution and a reducing agent ascorbic acid solution of the equal volume are mixed evenly to carry out an oxidation-reduction reaction, so that sediment is generated; and the sediment is cleaned and dried so that the metal silver powder with high tap-density and high crystallinity degree can be obtained. By the adoption of the method, the silver nitrate and the ascorbic acid solution are subjected to the oxidation-reduction reaction, the following reaction equation of 2AgNO3+C6H8O6=2Ag+C6H6O6+2HNO3 is abided by, an addition agent used in the reaction plays the effects of dispersing the silver powder and adjusting the shape and grain size of the silver powder; moreover, the addition amount is small, the oxidation-reduction reaction temperature is low, energy is saved, and the reaction process can be controlled easily; and the grain size and surface shape of the prepared metal silver powder can both meet the requirements and quality is stable.

Description

technical field [0001] The invention belongs to the technical field of precious metal powder preparation, and in particular relates to a method for preparing metallic silver powder with high tap density and high crystallinity. Background technique [0002] In recent years, the rapid development of photovoltaic energy, electronic information and other industries has led to a rapid increase in the annual demand for high-performance electronic silver paste. The main components of electronic silver paste include silver powder, organic carrier, glass powder and additives, among which metallic silver powder is the main component of electronic silver paste, and its performance determines the performance of silver paste. Therefore, preparing high-performance silver powder is an important direction to obtain high-performance electronic silver paste. In order to make the electronic silver paste have excellent performance, higher requirements are put forward for the performance parame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 孟晗琪操齐高郑晶陈昆昆吴永谦
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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