Flake silver powder prepared by means of chemical reduction method and preparation method thereof

A technology of flake silver powder and reduction method, which is applied in the field of materials, can solve the problems of easy introduction of impurity technical indicators, high yield of ball milling method, difficulty in maintaining consistency, etc., and achieve high uniformity of shape and particle size, low cost and excellent quality Effect

Inactive Publication Date: 2019-08-23
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

The ball milling method has high yield and low cost, but it is easy to introduce impurities and the technical indicators are difficult to maintain consistency; the silver powder prepared by the chemical method has high uniformity in particle size and shape, but the yield is low

Method used

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  • Flake silver powder prepared by means of chemical reduction method and preparation method thereof
  • Flake silver powder prepared by means of chemical reduction method and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A method for preparing flake silver powder by a chemical reduction method, comprising:

[0032] Step 1, select and weigh each raw material.

[0033] Step 2, prepare the reduction solution: add 1500ml of pure water into a 5L beaker, place it in a constant temperature water bath with circulation heating function, set the temperature at 40°C, and add acacia to the beaker after the temperature reaches the set value Stir 62.5g of rubber powder, 30g of potassium sulfate, 80g of hydrogen peroxide, and 100g of vitamin C to fully dissolve them, and then use nitric acid to adjust the pH of the solution to 3.5-4, and set aside.

[0034] Step 3, prepare silver nitrate solution: add 1500ml of pure water into a 5L beaker, then add 300g of silver nitrate to stir and dissolve, then adjust the pH value to 3.5-4, and set aside. Adjust the pH of the solution with nitric acid.

[0035] Step 4, use a peristaltic pump to add the silver nitrate solution obtained in step 3 to the reducing solu...

Embodiment 2

[0039] A method for preparing flake silver powder by a chemical reduction method, comprising:

[0040] Step 1, select and weigh each raw material.

[0041] Step 2, prepare the reduction solution: add 1200ml of pure water into a 5L beaker, place it in a constant temperature water bath with circulation heating function, set the temperature at 40°C, and add acacia to the beaker after the temperature reaches the set value Stir 60g of rubber powder, 25g of potassium sulfate, 70g of hydrogen peroxide, and 90g of vitamin C to fully dissolve them, then use nitric acid to adjust the pH of the solution to 3.5-4, and set aside.

[0042] Step 3, prepare silver nitrate solution: add 1200ml of pure water into a 5L beaker, then add 250g of silver nitrate to stir and dissolve, then adjust the pH value to 3.5-4, and set aside. Adjust the pH of the solution with nitric acid.

[0043] Step 4, use a peristaltic pump to add the silver nitrate solution obtained in step 3 to the reducing solution ...

Embodiment 3

[0047] A method for preparing flake silver powder by a chemical reduction method, comprising:

[0048] Step 1, select and weigh each raw material.

[0049] Step 2, prepare the reduction solution: add 1600ml of pure water into a 5L beaker, place it in a constant temperature water bath with circulation heating function, set the temperature at 40°C, and add acacia to the beaker after the temperature reaches the set value Stir 65g of rubber powder, 35g of potassium sulfate, 90g of hydrogen peroxide, and 120g of vitamin C to make them fully dissolve, then use nitric acid to adjust the pH of the solution to 3.5-4, and set aside.

[0050] Step 3, prepare silver nitrate solution: add 1600ml of pure water into a 5L beaker, then add 350g of silver nitrate to stir and dissolve, then adjust the pH value to 3.5-4, and set aside. Adjust the pH of the solution with nitric acid.

[0051] Step 4, use a peristaltic pump to add the silver nitrate solution obtained in step 3 to the reducing sol...

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Abstract

The invention discloses flake silver powder prepared by means of a chemical reduction method and a preparation method thereof. The method comprises the steps that firstly, all raw materials are selected and weighed; secondly, under constant-temperature water bath conditions, gum acacia powder, potassium sulphate, hydrogen peroxide and vitamin C are added into water and stirred to dissolve, and thepH value of a solution is adjusted; thirdly, silver nitrate is added into water and stirred to dissolve, and the pH value of a solution is adjusted; fourthly, the silver nitrate solution is added into the reducing solution for reaction, and stirring and heat preservation are performed; and fifthly, after flake silver powder particles are formed, cooling and filtering are performed in sequence, the particles are cleaned with pure water and then cleaned with ethyl alcohol, finally, extraction filtration is performed to remove moisture, and drying is performed. The invention further provides theflake silver powder prepared by means of the method. The preparation method is used for preparing the flake silver powder with the grain size being around 2-4 [mu]m, and the silver powder is high incrystallinity degree, good in dispersity, high in shape and grain size uniformity, stable in performance, excellent in quality, simple in preparation method, low in cost and high in yield.

Description

technical field [0001] The invention relates to a silver powder in the field of materials and a preparation method thereof, in particular to a flake silver powder prepared by a chemical reduction method and a preparation method thereof. Background technique [0002] With the development of science and 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 use of silver powder in the electronics industry is mainly by coating or printing silver paste made of silver powder on various substrates, and then heating and curing or heating to form a conductive film to form a path. Conductive silver powder is the ...

Claims

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Application Information

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