Nano Ag powder preparation method

A nano-solution technology, applied in the field of powder metallurgy, can solve the problems of uneven particle size distribution of Ag powder, limited popularization and application, and easy particle agglomeration, etc., and achieves the effect of simple operation, low process conditions and uniform particle size distribution

Inactive Publication Date: 2015-06-03
侯善敬
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Problems solved by technology

However, the preparation of nano-Ag powder by liquid phase reduction method has problems such as uneven particle size distribution, low collection rate, high impurity content, and easy agglomeration of particles, which limit its promotion and application in industrial mass production.

Method used

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  • Nano Ag powder preparation method

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Embodiment Construction

[0016] A preparation method of nano Ag powder, comprising the following steps:

[0017] (1) Preparation: raw materials: silver nitrate, hydrazine hydrate solution, ammonia water, polyvinylpyrrolidone (PVP), compound protective agent; the equipment used in the test is: 79HW-1 constant temperature magnetic stirrer, ZK-82A vacuum drying oven , 80-2 electric centrifuge, KQ-50E ultrasonic cleaner;

[0018] (2) Prepare the mixed solution: Dissolve silver nitrate in distilled water to prepare a 0.01mol / L solution, add a compound protective agent, and stir thoroughly to obtain a mixed solution;

[0019] (3) Prepare the reducing solution: dissolve hydrazine hydrate in distilled water, add ammonia water dropwise to adjust the pH value of the solution to 11, and obtain the reducing solution after fully stirring;

[0020] (4) Oxidation-reduction reaction: put the above-mentioned reducing solution on a high-speed stirrer, heat it to 40°C, and add a mixed solution containing silver nit...

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Abstract

The invention relates to the technical field of powder metallurgy, in particular to a nano Ag powder preparation method. The method includes preparation; mixed solution preparation, reduction solution preparation, oxidation reduction reaction, centrifugal separation and high pressure drying. The method is simple to operate, the required process condition is simple, the nano silver produced by the method has high purity, even granularity distribution, high collection rate and low impurity content, and grains are not prone to gathering.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a preparation method of nano Ag powder. Background technique [0002] At present, the main methods for preparing nano-Ag powder are physical and chemical methods. Physical methods mainly include microwave method, radiation method, spray pyrolysis method and high-energy ball milling method, etc. Physical methods have higher production costs due to higher requirements for equipment and instruments. The chemical reduction method is currently the most commonly used method for preparing nano-Ag powder, mainly including sol-gel method, microemulsion method and liquid phase reduction method. Among them, the liquid phase reduction method has the advantages of simple process and equipment, convenient operation, low production cost and easy industrialization, etc., and has become one of the hot spots in the development of nano-Ag powder. However, the preparation of nano-Ag powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 侯善敬
Owner 侯善敬
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