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Method for preparing high-tap-density silver flake

A technology of flake silver powder and tap density, which is applied in metal processing equipment, transportation and packaging, etc., to achieve the effect of reducing adverse effects

Inactive Publication Date: 2019-12-20
苏州银瑞光电材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional flaky silver powder is more used in silver paste with lower silver content (silver content <75%), because of the surface-to-surface contact between powders, compared with spherical / spherical silver powder, it can provide Better conductivity, but with the development of new varieties, such as HIT silver paste in the photovoltaic industry and some niche conductive adhesives, the silver content is required to reach more than 80%, and the particle size and specific surface area are suitable for printing. Better electrical conductivity and weather resistance can be obtained at a curing temperature of 250°C, while the traditional flake silver powder can no longer meet the requirements

Method used

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  • Method for preparing high-tap-density silver flake
  • Method for preparing high-tap-density silver flake
  • Method for preparing high-tap-density silver flake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] A preparation method of high tap density flaky silver powder, comprising the following steps:

[0082] Step 1: Prepare a solution, including silver nitrate solution A, reducing agent solution B, regulator solution C and dispersant solution D;

[0083] Step 2: Reduction reaction, under high-speed stirring, slowly add the regulator solution C to the silver nitrate solution A, and immediately add the reducing agent solution B quickly, and quickly add the dispersant within 10 seconds after the reducing agent solution B is added For solution D, adjust the heating temperature in stages after adding, and keep the temperature between 50°C and 90°C for reaction;

[0084] Step 3: After the reduction reaction in step 2 is completed, remove the supernatant after the reaction by sedimentation, transfer the remaining part to the cleaning bucket, backwash with deionized water until the conductivity is ≤ 20μS / cm, and remove the supernatant by suction filtration liquid;

[0085] Step ...

Embodiment 1

[0094] A preparation method of high tap density flaky silver powder, comprising the following steps:

[0095] Preparation of silver nitrate solution

[0096] Accurately weigh 1kg of silver nitrate, dissolve it in 20L of deionized water, and prepare a silver nitrate solution with a mass concentration of 4.76%wt, control the temperature in a water bath at 22°C-24°C, stir for 15min, and prepare silver nitrate solution A;

[0097] Preparation of reducing agent solution

[0098] Accurately weigh 0.75kg of ascorbic acid and 0.01kg of hydrazine hydrate, dissolve them in 5L of deionized water, control the temperature of the solution at 22°C to 24°C, and stir for 30min to prepare reducing agent solution B;

[0099] Preparation of conditioner solution

[0100] Dissolve 410g of sodium hydroxide in 1L of deionized water and adjust the temperature to 22-24°C to prepare conditioner solution C;

[0101] Preparation of dispersant solution

[0102] Add 20g of polyvinyl alcohol into 0.5L of...

Embodiment 2

[0113] A preparation method of high tap density flaky silver powder, comprising the following steps:

[0114] Preparation of silver nitrate solution

[0115]Accurately weigh 1kg of silver nitrate, dissolve it in 15L of deionized water, and prepare a silver nitrate solution with a mass concentration of 6.25%wt, control the temperature in a water bath at 35°C to 37°C, and stir for 15min to prepare silver nitrate solution A;

[0116] Preparation of reducing agent solution

[0117] Accurately weigh 0.5kg of glucose and 0.12kg of acetaldehyde, dissolve them in 5L of deionized water, control the temperature of the solution at 35°C to 40°C, and stir for 30min to prepare reducing agent solution B;

[0118] Preparation of conditioner solution

[0119] Dissolve 480g of sodium carbonate in 1L of deionized water and adjust the temperature to 40-45°C to prepare conditioner solution C;

[0120] Preparation of dispersant solution

[0121] Add 20g of polyacrylic acid into 0.5L of deionize...

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Abstract

The invention relates to a method for preparing high-tap-density silver flake. The method comprises the following steps of S1, preparation of a solution, S2, reduction reaction, S3, cleaning and filtering, S4, ball milling of silver powder, S5, drying of the silver powder, and S6, screening and testing of the silver powder. The method is simple in process and good in reproducibility in the preparation process, and industrialized production can be achieved.

Description

technical field [0001] The invention belongs to the field of silver powder preparation, and in particular relates to a preparation method of high tap density flaky silver powder. Background technique [0002] With the acceleration of the localization of various electronic components, the manufacturing level of supporting electronic pastes has been rapidly improved, and more subdivided fields require subdivided electronic pastes, and the subsequent requirements for raw material silver powder are more specific and specific. diversification. Traditional flaky silver powder is more used in silver paste with lower silver content (silver content <75%), because of the surface-to-surface contact between powders, compared with spherical / spherical silver powder, it can provide Better conductivity, but with the development of new varieties, such as HIT silver paste in the photovoltaic industry and some niche conductive adhesives, the silver content is required to reach more than 80...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F9/04B22F1/00
CPCB22F9/24B22F9/04B22F2009/043B22F1/068
Inventor 李文焕王亚平潘炼李利潮
Owner 苏州银瑞光电材料科技有限公司
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