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A method for preparing silver powder by space confinement method

A technology of silver powder and confinement, which is applied in the field of metal powder material preparation, can solve the problems of complex process flow and unsuitability for large-scale production, and achieve the effects of convenient operation process, considerable enterprise benefit index and labor saving

Active Publication Date: 2021-04-13
西安宏星电子浆料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is complicated, and impurity ions are introduced, so it is not suitable for large-scale production

Method used

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  • A method for preparing silver powder by space confinement method
  • A method for preparing silver powder by space confinement method
  • A method for preparing silver powder by space confinement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Dissolve 600g silver nitrate white crystals with 1962mL deionized water to obtain a silver nitrate aqueous solution with a concentration of 1.8 mol / L, add 30g Tween-80 to it, stir and dissolve to obtain a uniform silver nitrate dispersion, and maintain the solution temperature at 30±2°C.

[0031] Step 2: Weigh 300g of ascorbic acid and 90g of sodium ascorbate and dissolve them in 2214mL of deionized water, stir and dissolve to obtain a reducing agent aqueous solution with a concentration of 1.0 mol / L, and maintain the solution temperature at 30±2°C; under an ultrasonic bath, dissolve the reducing agent The aqueous solution is transferred from the screw reactor (such as figure 1 As shown) the middle inlet of the top is added, the flow rate is controlled at 40mL / min, and after flowing through 1 / 5 of the height of the glass tube, the silver nitrate dispersion is added from the top side inlet of the spiral reactor, and the flow rate is controlled at 30mL / min. The s...

Embodiment 2

[0035] Step 1: Dissolve 600g of silver nitrate white crystals with 1962mL of deionized water to obtain a silver nitrate aqueous solution with a concentration of 1.8 mol / L, add 60g of polyvinylpyrrolidone-K30 to it, stir and dissolve to obtain a uniform silver nitrate dispersion, and maintain the solution temperature at 30±2°C.

[0036]Step 2: Dissolve 300g of ascorbic acid and 30g of sodium borohydride in 2214mL of deionized water, stir and dissolve to obtain a reducing agent aqueous solution with a concentration of 1.0 mol / L, and maintain the solution temperature at 30±2°C; The aqueous solution of silver nitrate is added from the middle inlet of the top of the spiral reactor through a circulating pump, and the flow rate is controlled at 30mL / min. After flowing through 1 / 2 of the height of the glass tube, the silver nitrate dispersion is added from the top side of the spiral reactor. The flow rate is controlled at 20mL / min, so that silver nitrate and reducing agent undergo a r...

Embodiment 3

[0040] Step 1: Dissolve 600g silver nitrate white crystals with 1962mL deionized water to obtain a silver nitrate aqueous solution with a concentration of 1.8 mol / L, add 30g Tween-80 to it, stir and dissolve to obtain a uniform silver nitrate dispersion, and maintain the solution temperature at 30±2°C.

[0041] Step 2: Dissolve 300g of ascorbic acid and 90g of phosphorous acid in 2214mL of deionized water, stir and dissolve to obtain a reducing agent aqueous solution, the concentration of which is 1.0 mol / L, and maintain the solution temperature at 30±2°C; The aqueous solution is added from the middle inlet on the top of the spiral reactor through a circulating pump, and the flow rate is controlled at 40mL / min. After flowing through 1 / 5 of the height of the glass tube, the silver nitrate dispersion is added from the top side inlet of the spiral reactor, and the flow rate is Controlled at 30mL / min, the silver nitrate and the reducing agent undergo a reduction reaction in the sp...

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Abstract

The invention discloses a method for preparing silver powder by a space-confined method. A spiral reactor is used to add double reducing agents without stirring, and the silver powder is prepared in an ultrasonic parallel flow mode. The obtained silver slurry is filtered, washed, emulsified, dried and pulverized to obtain silver powder. The whole reaction process does not need to control the temperature of the reduction reaction, which provides a new idea for the preparation of silver powder. The silver powder prepared by the invention has extremely high dispersibility, can realize single particle dispersion of silver powder, and has a tap density greater than 6.0g / cm 3 , bulk density greater than 3.3g / cm 3 , has broad marketing prospects. And the dispersibility of silver powder can be increased by ultrasonic instead of stirring, and the soft agglomerated silver powder will be dispersed during the reaction process. The spiral reactor can reduce the sticking phenomenon of silver powder in the reactor. During use, the cleaning of the reactor Convenient and not easy to block.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal powder materials, and in particular relates to a method for preparing silver powder by a space confinement method. Background technique [0002] With the development of electronic products in the direction of miniaturization, high integration, high frequency and multi-dimensionalization, the development of electronic paste and powder industry has been driven. Electronic paste is widely used in various electronic components. Its conductivity is widely used in electronic pastes with conductive properties, such as solar cells, automotive glass and thick film integrated circuits. The heating wire on the car glass is used to defrost the fog and has become one of the indispensable devices of the car. In order to achieve the purpose of rapid defrosting, silver films with high conductivity and high adhesion are generally used as heating wires, and the viscosity, wettability, rheology, thixot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/14B22F1/142B22F1/10
Inventor 马倩陆冬梅吴高鹏王要东高振威兰金鹏王大林
Owner 西安宏星电子浆料科技股份有限公司
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