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Flake silver powder and preparation method thereof

A flaky silver powder and silver powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of large consumption of silver powder, easy to fall off, unstable performance, etc., and achieve excellent quality, meet process requirements, and stable performance.

Pending Publication Date: 2020-08-25
河南金渠银通金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the consumption of silver powder is huge, and if the quality requirements of silver powder are not up to standard, the products made of it will not be stable enough and easy to fall off, so it is necessary to improve the performance of silver powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The method for preparing flaky silver powder provided by the present invention comprises:

[0019] Step 1, prepare solution A: add deionized water to the reactor, then add silver nitrate crystals, stir to dissolve uniformly, and then use; step 2, prepare solution B: add deionized water to the reactor, then add formaldehyde, stir to dissolve After uniformity, use; step 3, reduction reaction: add solution B to solution A to prepare the original powder of flaky silver powder, then wash the powder and filter, then remove the excess water, repeat the washing process, deposit the silver powder, after drying Dry to obtain silver powder; step 4, prepare reagent H1 solution: dissolve stearic acid or oleic acid in absolute ethanol, stir and mix evenly; step 5, ball mill: turn on the cooling water, close the valve at the bottom of the mill, and then turn on the mill to stir , Add the dissolved reagent H1 solution into the grinder, then slowly add the silver powder to the grinder, and...

Embodiment 1

[0031] A method for preparing flaky silver powder, which comprises:

[0032] Step 1. Prepare solution A: add 6500g of deionized water to the reaction kettle, and then add 1000g of silver nitrate crystals, stir and dissolve uniformly, and keep the temperature at 35°C.

[0033] Step 2. Preparation of solution B: Add 850 g of deionized water to the reaction kettle, and then add 600 g of formaldehyde, stir to dissolve uniformly, and then set aside. Keep the temperature range at 35°C.

[0034] Step 3. Reduction reaction: Add solution B to solution A at a flow rate of 50ml / min to prepare the original flake silver powder, then wash the powder and filter, and then remove excess water. Repeat the washing process several times until the waste is removed The liquid conductivity is less than 10, and silver powder is deposited, which is dried to obtain silver powder.

[0035] Step 4. Prepare reagent H1 solution: Dissolve 120 g stearic acid or oleic acid in 300 g absolute ethanol, stir and mix well...

Embodiment 2

[0042] A method for preparing flaky silver powder, which comprises:

[0043] Step 1. Prepare solution A: add 6000 g of deionized water to the reaction kettle, and then add 1000 g of silver nitrate crystals, stir and dissolve uniformly, and keep the temperature range at 32°C.

[0044] Step 2. Preparation of solution B: Add 800 g of deionized water to the reaction kettle, and then add 600 g of formaldehyde, stir to dissolve uniformly, and use it for later use, keeping the temperature range at 32°C.

[0045] Step 3. Reduction reaction: Add solution B to solution A at a flow rate of 50ml / min to prepare the original flake silver powder, then wash the powder and filter, and then remove excess water. Repeat the washing process several times until the waste is removed The liquid conductivity is less than 10, and silver powder is deposited, which is dried to obtain silver powder.

[0046] Step 4. Prepare reagent H1 solution: Dissolve 120 g stearic acid or oleic acid in 300 g absolute ethanol, ...

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PUM

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Abstract

The invention discloses flake silver powder and a preparation method thereof. The method comprises the steps that 1, a solution A is prepared; 2, a solution B is prepared; 3, the solution B is added into the solution A, raw powder of the flake silver powder is prepared, then the raw powder is washed and filtered, redundant moisture is removed, the washing process is repeated to deposit silver powder, and the silver powder is obtained after drying; 4, a reagent H1 solution is prepared; 5, ball-milling is performed; and 6, drying and packaging are performed. The flake silver powder prepared through the method is also provided. According to the flake silver powder and the preparation method thereof, the process is simple, cost is low, and industrialization is easy to realize; the prepared silver powder is neat in appearance, uniform in granularity distribution, high in crystallinity, good in dispersity, high in morphological particle size consistency, stable in performance and excellent in quality; and the preparation method is simple, low in cost and high in yield.

Description

Technical field [0001] The invention relates to a silver powder and a preparation method thereof, in particular to a flaky silver powder and a preparation method thereof. Background technique [0002] With the development of technology and the application of electronic products, the quality of the power distribution layer and electrodes in electronic instruments determines the service life of electronic instruments. Silver is widely used in electronics industry, sewage treatment, building materials and many other fields because of its good natural high electrical conductivity, sterilization, thermal conductivity and strong oxidation resistance. The silver powder used in the electronics industry is mainly by coating or printing a silver paste made of silver powder on various substrates, and then heat curing or heating to burn to form a conductive film, thereby forming a path. Conductive silver powder is the main raw material for making electronic paste, conductive silver paste, L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F9/04B22F1/00
CPCB22F9/24B22F9/04B22F2009/043B22F1/068B22F1/142
Inventor 沈仙林周斌
Owner 河南金渠银通金属材料有限公司
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