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Chemical preparing process for flake micron silver powder

A technology of micron silver powder and flake, which is applied in the field of chemical preparation of flake micron silver powder, can solve the problems of poor product performance, complicated process, high energy consumption, etc., and achieve the effect of good crystallization degree, simple preparation process and high conductivity

Inactive Publication Date: 2008-06-18
TIANJIN ZHONGKE PHYSICAL & CHEM NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high energy consumption, complex process, poor product performance, and low yield of the existing flake silver powder preparation process, and provide a preparation process that is simple in process and does not use surfactants or polymers as dispersants. Wet chemical method of flake silver powder

Method used

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  • Chemical preparing process for flake micron silver powder
  • Chemical preparing process for flake micron silver powder

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1.3 parts by weight of silver nitrate and 18.4 parts by weight of commercially available nitric acid (65-68% in mass concentration) were dissolved in 65.8 parts by weight of water as the bottom solution. 1.3 parts of commercially available L-ascorbic acid (solid) was dissolved in 13.2 parts by weight of water as a reducing solution. Quickly inject the reducing solution into the bottom solution under the condition of stirring; after the addition is completed, stop stirring immediately after the above solution is mixed evenly, and continue to react for 10 minutes. The whole process is carried out at 20±5°C. Then the upper cloudy liquid was poured off. Wash the resulting flaky silver powder with distilled water to neutrality, then wash it with ethanol for one to three times, filter it, and dry it or use other drying methods to dry the product. The scanning electron micrographs of the prepared flake micron silver powder are as follows: figure 1 As shown, the flaky micron...

Embodiment 2

[0034] 1.3 parts by weight of silver nitrate and 11.3 parts by weight of commercially available nitric acid were dissolved in 72.7 parts by weight of water as bottom solution. 1.3 parts by weight of commercially available D-erythorbic acid (solid) was dissolved in 13.4 parts by weight of water as a reducing solution. Under the condition of stirring, quickly inject the reducing solution into the bottom solution; after the addition is completed, stop stirring immediately after the above solution is mixed evenly, and continue to react for 15 minutes. The whole process is carried out at 35±5°C. Then the upper cloudy liquid was poured off. Wash the resulting flaky silver powder with distilled water to neutrality, then wash it with ethanol for one to three times, filter it, and dry it or use other drying methods to dry the product. The granular powder X-diffraction spectrum of the flaky micron silver powder that obtains is as figure 2 As shown, the flaky micron silver powder is ...

Embodiment 3

[0036] 1.8 parts by weight of silver nitrate and 20.3 parts by weight of commercially available glacial acetic acid were dissolved in 58 parts by weight of water as the bottom liquid. 1.5 parts by weight of commercially available L-ascorbic acid was dissolved in 18.4 parts by weight of water; used as a reducing solution. Quickly inject the reducing solution into the bottom solution under the condition of stirring; after the addition is completed, stop stirring immediately after the above solution is mixed evenly, and continue to react for 20 minutes. The whole process is carried out at 15±5°C. Then the upper cloudy liquid was poured off. Wash the resulting flaky silver powder with distilled water to neutrality, then wash it with ethanol for one to three times, filter it, and dry it or use other drying methods to dry the product. The flaky micron silver powder is single crystal, the shape is hexagonal sheet, the average particle diameter of the flaky micron silver powder is b...

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Abstract

The invention relates to the technical field of metallic material, in particular to the chemical preparation method of a series of flaky micron silver powder. Adopt chemical deoxidizing method under acidic condition, take water as dispersion medium; under the condition that no surfactant or high molecule is used as dispersant, silver nitrate is directly deoxidized in solution by using deoxidizing agent; use acid as morphology regulator to prepare flaky micron silver powder; the final product is obtained through washing, filtering and drying. The flaky micron silver powder obtained from the invention can be used for the preparation of conductive coatings, conducting paint and conductive adhesive. The method of the invention has simple technique, and the production yield is more than 95 percent; the obtained product has a regular morphology with high purity, good electric conductivity and uniform size distribution. The particle diameter and the thickness of the obtained products are adjustable within respective sizes of 5 to 50 micron and 0.1 to 0.5 micron.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a series of chemical preparation methods of flaky micron silver powder. Background technique [0002] Flake silver powder is an important conductive medium for high-performance conductive coatings or conductive paints, electromagnetic shielding coatings, etc.; it is a basic material for flexible circuit boards, contact switches, membrane switches, etc.; it is also a variety of high-end electrodes and electromagnetic compatibility materials. The morphology and purity of silver powder directly affect its electrical conductivity, and the electrical conductivity of silver powder is the decisive factor for the performance of various materials prepared. [0003] At present, most of the flaky silver powders used to prepare high-performance conductive coatings in the world are made from granular silver powders through long-term ball milling. This method is not only complicated i...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 刘春艳张志颖冯先涛
Owner TIANJIN ZHONGKE PHYSICAL & CHEM NEW MATERIAL TECH CO LTD
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