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Preparation method of silver powder

A technology of silver powder and silver nitrate, which is applied in metal processing equipment, transportation and packaging, etc., can solve problems such as inability to settle, affecting the performance of silver powder, and high organic residue ratio on the surface of silver powder

Active Publication Date: 2022-04-19
南通领跑者新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using a water-based dispersant, in order to obtain a highly dispersible silver powder, the amount of the dispersant is often relatively large, but after the amount of the dispersant increases, the reaction liquid with water as the solvent will show a gel state, which will lead to silver powder After the reduction is completed, it floats in large quantities in the water and cannot settle
Even after using a certain type and a certain amount of flocculant to make it settle, the proportion of organic residues on the surface of the silver powder will be high, which will affect the performance of the silver powder in the slurry in the later stage

Method used

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  • Preparation method of silver powder
  • Preparation method of silver powder

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Effect test

Embodiment 1

[0032] A preparation method of silver powder, comprising the following steps:

[0033] (1) Take 60L of deionized water and 4Kg of silver nitrate, the concentration of the silver nitrate is 0.5mol / L, stir well, add 250g of gum arabic, stir at 25°C until dissolved, and obtain solution A;

[0034] Take 60L of deionized water and 4Kg of ascorbic acid, mix well, add 360g of gum arabic, stir at 30°C until dissolved, and obtain solution B;

[0035] (2) Take solution B, add solution B to solution A at a rate of 2L / min, and react completely at 50°C to obtain suspension C;

[0036] (3) Take 24kg of sodium hydroxide and make it into a 50% sodium hydroxide solution; add 50% sodium hydroxide solution to the suspension C to adjust the pH to 14, heat up to 65°C, and keep stirring for 0.5h , after the supernatant is clarified, extract the supernatant, collect the silver powder, wash, filter and dry to obtain the finished product.

Embodiment 2

[0038] A preparation method of silver powder, comprising the following steps:

[0039] (1) Take 60L of deionized water and 4Kg of silver nitrate, the concentration of the silver nitrate is 0.5mol / L, stir evenly, add 250g of gum arabic, stir at 32°C until dissolved, and obtain solution A;

[0040] Take 60L of deionized water and 4Kg of ascorbic acid, mix well, add 360g of gum arabic, stir at 34°C until dissolved, and obtain solution B;

[0041](2) Take solution B, add solution B to solution A at a rate of 2.5L / min, and react completely at 55°C to obtain suspension C;

[0042] (3) Take 24kg of sodium hydroxide and make it into a 50% sodium hydroxide solution; add 50% sodium hydroxide solution to the suspension C to adjust the pH to 14, heat up to 72°C, and keep stirring for 1.5h , after the supernatant is clarified, extract the supernatant, collect the silver powder, wash, filter and dry to obtain the finished product.

Embodiment 3

[0044] A preparation method of silver powder, comprising the following steps:

[0045] (1) Take 60L of deionized water and 4Kg of silver nitrate, the concentration of the silver nitrate is 0.5mol / L, stir evenly, add 250g of gum arabic, stir at 35°C until dissolved, and obtain solution A;

[0046] Take 60L of deionized water and 4Kg of ascorbic acid, mix well, add 360g of gum arabic, stir at 35°C until dissolved, and obtain solution B;

[0047] (2) Take solution B, add solution B to solution A at a rate of 3L / min, and react completely at 60°C to obtain suspension C;

[0048] (3) Take 24kg of sodium hydroxide and make it into a 50% sodium hydroxide solution; add 50% sodium hydroxide solution to the suspension C to adjust the pH to 14, heat up to 75°C, keep stirring for 2 hours, After the supernatant is clarified, extract the supernatant, collect the silver powder, wash, filter and dry to obtain the finished product.

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Abstract

According to the scheme, a liquid phase reduction method is firstly adopted, silver nitrate and a reducing agent are adopted according to the main principle, and a certain amount of water-based dispersing agent or oil-based dispersing agent is added, so that the silver powder with certain dispersing performance is obtained, and in order to guarantee that the silver powder with high dispersity and uniform particle size can be obtained, the preparation method is simple, and the cost is low. The water-based dispersing agent is selected, meanwhile, the reducing agent is any one or more of ascorbic acid, formaldehyde, hydrazine hydrate and hydrogen peroxide, after the reduction reaction is finished, alkali liquor continues to be added, the pH of the suspension C is adjusted to be 8-14, hydroxyl ions are contained in the system in the process, the structure of the dispersing agent can be destroyed through strong alkalinity, and therefore the dispersing effect is improved. Therefore, the dissociation effect is achieved; the method can be applied to any preparation method of the silver powder using the water-based dispersing agent, complete sedimentation of the silver powder can be achieved, organic residues on the surface of the obtained silver powder are lower than those of the silver powder not using the method by 0.3% or above, and high practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of silver powder preparation, in particular to a preparation method of silver powder. Background technique [0002] Now the preparation method of silver powder generally adopts the liquid phase reduction method. In order to improve the dispersion performance of silver powder, a certain amount of water-based or oil-based dispersant is generally added to it, because water-based dispersant can obtain high dispersion and uniform particle size compared with oil-based dispersant. The silver powder in the actual preparation process is mainly based on water-based dispersant. [0003] When using a water-based dispersant, in order to obtain a highly dispersible silver powder, the amount of the dispersant is often relatively large, but after the amount of the dispersant increases, the reaction liquid with water as the solvent will show a gel state, which will lead to silver powder After the reduction is completed, it ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/145
CPCB22F9/24
Inventor 陶俊其他发明人请求不公开姓名
Owner 南通领跑者新材料科技有限公司
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