Preparing method for superfine silver powder

A technology of ultra-fine silver and silver nitrate, which is applied in the field of silver powder production equipment, can solve the problems of widening particle size range, large variation of silver powder particles, and inability to ensure constant solution concentration, and achieve the effect of simple and convenient operation and uniform particle size

Inactive Publication Date: 2019-03-19
成都市天甫金属粉体有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wet reduction process of silver powder is generally carried out in the reaction kettle, and the reducing agent is added to the silver nitrate solution or the silver nitrate solution is added to the reducing agent solution. With the addition of a variety of solutions, the concentration of each material in the reactor is changing all the time, so the constant concentration of the solution cannot be guaranteed, and the consistency of the entire reduction process cannot be guaranteed, and during the reaction process, the silver powder particles and reaction products after the reaction Stir and mix together in the reactor, resulting in larger changes in silver powder particles and wider particle size range

Method used

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  • Preparing method for superfine silver powder

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preparation example Construction

[0029] The preparation method of described silver ammonium ion solution is as follows: according to the mass ratio of silver nitrate and deionized water, silver nitrate is dissolved in deionized water according to the mass ratio of silver nitrate and deionized water, and silver nitrate solution is obtained after the dissolution is complete. The silver nitrate solution is ammonia water with a volume ratio of 1:2, and the stirring is continued until the solution is constant to a transparent solution, and the silver ammine ion solution is obtained.

[0030] The aqueous dispersant solution is prepared by the following method: adding the natural macromolecular water-soluble colloid to deionized water according to the mass ratio of the natural macromolecular water-soluble colloid to deionized water at a ratio of 1:50, stirring and dissolving, and preparing a colloid solution.

[0031] The hydrazine hydrate aqueous solution is prepared by the following method: add deionized water to ...

Embodiment 1

[0041] Such as figure 1 Shown, a kind of preparation method of superfine silver powder specifically comprises the following steps:

[0042] S1) Dissolve 5000g of silver nitrate in 10L of water. After the dissolution is complete, add 5L of ammonia water with a content of 20-35% under stirring conditions. At this time, you will see that the solution first turns transparent to brown, and then gradually turns from brown to transparent solution. Then Add deionized water to dilute the solution to 15L to obtain a silver ammonium ion solution, which is set aside;

[0043] Add 1000g of natural macromolecular water-soluble colloid into 50L of deionized water, stir and dissolve, and prepare a colloid solution to obtain an aqueous dispersant solution for subsequent use;

[0044] Add 2200 g of hydrazine hydrate solution with a content ≥ 80% into deionized water to prepare a 10 L solution to obtain an aqueous hydrazine hydrate solution for later use.

[0045] S2) The prepared silver ammoniu...

Embodiment 2

[0049] This embodiment is improved on the basis of Embodiment 1. The improvement is that: the reactor body also includes a temperature adjustment chamber 3 arranged between the shell 1 and the reaction chamber 2, and the two ends of the temperature adjustment chamber 3 A liquid inlet 31 and a liquid outlet 32 ​​are respectively provided.

[0050] The upper and lower ends of the shell 1 are respectively connected to the two ends of the reaction pipeline near the feed port 21 and the discharge port 22, so that the shell 1 is sleeved on the outer surface of the reaction pipe. The temperature adjustment chamber 3 can adjust the temperature of the reaction raw materials in the reaction pipeline by flowing hot water through the liquid inlet 31 and then flowing out from the liquid outlet 32, so that the reaction raw materials can complete the reaction at a constant temperature.

[0051] The liquid inlet 31 is located at the lower end of the temperature adjustment chamber 3 , and the ...

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Abstract

The invention discloses a preparing method for superfine silver powder, and the preparing method is used in the technical field of silver powder wet process preparing equipment. A plurality of reaction raw materials are continuously added into a reactor with the curve flow path through a plurality of feeding ports at the same time. The reaction raw materials flow in the reactor along the curve flow path under the action of gravity, mixing and reacting are finished in the flow process, and products obtained through the reaction flow out of the reactor through a discharging port of the reactor.According to the disclosed preparing method for the superfine silver powder, the multiple reaction raw materials are added in the reactor with the multiple feeding ports and the curve flow path at thesame time, reaction raw material mixing and reacting are finished in the process that the reaction raw materials flow towards the discharging port from the feeding ports, stirring is not needed, mixing of the reaction raw materials is uniform, and the grain diameter of obtained silver powder is uniform.

Description

technical field [0001] The invention relates to the technical field of silver powder production equipment, in particular to a preparation method of ultrafine silver powder. Background technique [0002] Nano-silver powder is a simple substance of metallic silver whose particle size is nano-scale. Most of the nano-silver particle size is about 25 nanometers, which has a strong inhibitory and killing effect on dozens of pathogenic microorganisms such as Escherichia coli, Neisseria gonorrhoeae, and Chlamydia trachomatis, and will not produce drug resistance. Cotton socks made of nano-silver and combed cotton fibers have good antibacterial and deodorizing effects. [0003] In the process of wet reduction to produce silver powder, various reaction materials such as reducing agent, protective agent and acid-base are added. The wet reduction process of silver powder is generally carried out in the reaction kettle, and the reducing agent is added to the silver nitrate solution or ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 孙征樊林海朱俊杰
Owner 成都市天甫金属粉体有限责任公司
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