Method for preparing silver micro-powder for electronic paste of pressure sensitive element

A technology for electronic paste and pressure sensitive components, which is applied in the field of preparing silver micropowder for electronic paste of pressure sensitive components, which can solve the problems of low specific surface area, high bulk density of silver micropowder, unsuitability for electronic paste of pressure sensitive components, etc. , to achieve the effect of high surface activity and concentrated particle size distribution

Active Publication Date: 2013-11-27
中科铜都粉体新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing silver micropowder has problems such as high bulk density and low specific surface area and is not suitable fo

Method used

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  • Method for preparing silver micro-powder for electronic paste of pressure sensitive element

Examples

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Example Embodiment

[0017] Example 1: (1) Liquid preparation: Put solid silver nitrate crystals in the reactor and add sufficient water to stir to form a uniform aqueous solution. The mass ratio of silver nitrate solid crystals to water is 1:10, and the temperature is maintained at 35°C. , PH value is 4, make A solution; put the soda ash solid powder in the batching kettle and add enough water to stir to form a uniform aqueous solution. The quality of the soda ash solid powder is 50% of the quality of the silver nitrate solid crystal. The mass ratio of water is 1:6, the temperature is maintained at 40℃, the PH value is 12, and the solution B is prepared; gelatin is used as a surface coating agent and sufficient alcohol is added to stir to dissolve evenly. The amount of gelatin is the quality of silver nitrate solid crystals Make up 0.5% of silver nitrate and make solution C; make up an aqueous solution containing 37% of ascorbic acid and keep it at room temperature. The amount of ascorbic acid is 4...

Example Embodiment

[0021] Example 2: (1) Liquid preparation: Put solid silver nitrate crystals in the reactor and add enough water to stir to form a uniform aqueous solution. The mass ratio of silver nitrate solid crystals to water is 1:10, and the temperature is maintained at 45°C. , PH value is 5, make A solution; put the soda ash solid powder in the batching kettle and add enough water to stir to form a uniform aqueous solution. The quality of the soda ash solid powder is 50% of the quality of the silver nitrate solid crystal. The mass ratio of water is 1:6, the temperature is maintained at 50℃, the PH value is 13, and the solution B is prepared; gelatin is used as a surface coating agent and sufficient alcohol is added to stir to dissolve evenly. The amount of gelatin is the quality of silver nitrate solid crystals Make up 0.5% of silver nitrate and make solution C; make up an aqueous solution containing 37% of ascorbic acid and keep it at room temperature. The amount of ascorbic acid is 40% o...

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Abstract

The invention discloses a method for preparing silver micro-powder for electronic paste of a pressure sensitive element. The method includes the steps: (1) liquid preparation: placing solid crystals of silver nitrate into a reaction kettle, adding enough water into the reaction kettle and stirring the solid crystals and the water into a 0uniform water solution to prepare an A solution; placing solid powder of soda into a batching kettle, adding enough water into the batching kettle and stirring the solid powder and the water into a uniform water solution to prepare a B solution; taking gelatin as a surface coating agent, adding enough ethyl alcohol and uniformly stirring and dissolving the gelatin to prepare a C solution; preparing a water solution comprising, by weight, 37% of ascorbic acid and maintaining the normal temperature to prepare a D solution; (2) reaction: sequentially adding the C solution and the D solution into the B solution to form A1 mixed solution, firstly standing the A1 mixed solution for 15 min, stopping for 10min, and continuously and uniformly placing the A1 mixed solution into the A solution; (3) rinsing; (4) drying and crushing. The silver micro-powder can realize loose agglomeration of netted flocculent structures, and final products can achieve concentrated grain distribution and high surface activity.

Description

technical field [0001] The invention relates to a production method of silver micropowder, in particular to a production method of ultrafine silver powder for pressure-sensitive element electronic paste. Background technique [0002] The rapid development of the electronic information industry has driven the development of the electronic paste and silver powder (ultrafine silver powder) industries. Silver conductor has the highest electrical conductivity and its excellent application performance, which has an irreplaceable position in the electronics industry. Therefore, silver powder and its electronic paste series products are the most widely used and the largest amount of precious metal powder in the electronics industry, and are the basic and key functional materials for the production of various electronic components. Electronic paste products integrate metallurgy, chemical industry, and electronic technology. They are high-tech electronic functional materials and are ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 钱文生刘瑜郑胜友吴存坤樊占芳胡传龙李申平王长发
Owner 中科铜都粉体新材料股份有限公司
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