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Industrialized preparation technology of nm-class silver powder

A nano-level, silver powder technology is applied in the industrial preparation of nano-level silver powder and the industrial production field of nano-level silver powder, which can solve the problems of difficult cleaning and separation of slurry, shortening solution reduction reaction time, etc., and achieves simple equipment, saving reduction and precipitation. time, the effect of increasing the level of automation

Inactive Publication Date: 2006-01-11
UNIV OF SCI & TECH BEIJING
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  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide an industrialized preparation method of nano-scale silver powder, which obviously shortens the reaction time of solution reduction; adopts the method of adding a spacer to prevent the aggregation and growth of silver particles; solves the difficult problem of mother liquor separation and slurry cleaning and separation

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  • Industrialized preparation technology of nm-class silver powder

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Effect test

Embodiment 1

[0035] Embodiment 1: When preparing 1kg nano Ag powder, it should be completed according to the following steps.

[0036] 1. Weigh 1.57kg AgNO 3 Powder, by AgNO 3 :H 2 Add O=85:1000 mass ratio to 18.53Kg distilled water, heat to 80°C, make it fully dissolved, and prepare 20.1Kg AgNO 3 aqueous solution;

[0037] 2. Press PVA: H 2 O=2:100 (mass ratio), add 0.197Kg PVA to 9.85Kg distilled water, heat and stir at 100°C until completely dissolved, that is, prepare 10.05Kg PVA release agent solution for later use.

[0038] 3. Prepare (silver nitrate-PVA) binary mixture.

[0039] In the above 20.1Kg AgNO 3 In aqueous solution, according to PVA solution: AgNO 3 Solution=1:2 (mass ratio) Add 10.05Kg of PVA aqueous solution to prepare 30.15Kg (silver nitrate-PVA) binary mixed solution.

[0040] 4. Preparation of silver nitrate-hydrazine-PVA ternary mixed solution

[0041] Press N 2 h 4 ·H 2 O: AgNO 3 =1:1.7 mass ratio, 0.93Kg N 2 h 4 ·H 2 The O solution was slowly poured...

Embodiment 2

[0055] Embodiment 2: when preparing 500g nanometer Ag powder, should complete according to the following steps

[0056] 1. Weigh 0.785kg AgNO 3 powder, the AgNO 3 Press AgNO 3 :H 2 Add O=85:1000 mass ratio to 9.265Kg distilled water, heat to 60°C, stir vigorously, and prepare 10.05Kg AgNO 3 aqueous solution;

[0057] 2. Prepare PVA solution, press PVA:H 2 O=2:100 (mass ratio) Weigh 0.099Kg of PVA powder and 4.925Kg of distilled water, heat and stir at 90°C until completely dissolved, and prepare 5.024Kg of PVA release agent solution for later use.

[0058] 3. Preparation of (silver nitrate-PVA) binary mixture

[0059] Above-mentioned 1, 2 two kinds of solutions are mixed in total 15.074Kg to make binary mixed liquid, and concrete operation is exactly the same as (3,) among the embodiment 1.

[0060] 4. Preparation of silver nitrate-hydrazine-PVA ternary mixed solution

[0061] It is substantially the same as (4,) in Example 1. The difference is that 0.465kg N 2 h 4 ...

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Abstract

The invention provides an industrial producing technology for nanometer silver powder. It uses micro-wave activation and solution reducing process. The salt of silver AgNO3 ion is dissolved in water; it uses the character of N2H4 H2O which can provide electrons in water solution to accelerate the reaction speed. In order to resist the silver particle from being gathered when in separation, adds in a little polyvinyl alcohol separator in the reaction solution, reduces the Ag+2 ions into tiny Ag particles quickly. The NO32- ion in the reaction product is rinsed out by distilled water. And the invention uses alcohol to cleans the residual water, at the same time, adds in particle dispersant, the waste liquid and silver power are separated with high efficient continuous eccentric separation method. Finally, in the vacuum baking box, the silver can be acquired.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation in metal materials, and in particular provides an industrial preparation method of nano-scale silver powder, which is suitable for industrial production of nano-scale silver powder. Background technique [0002] Nano-scale silver powder is widely used in the electronics industry, especially in recent years, with the rapid development of microelectronics technology in the information industry, the demand for nano-scale silver paste coatings has increased rapidly. The annual demand in the United States is about 1,000 tons, and the annual demand in Japan and Europe is about 2,500 tons. my country's annual demand is 300 tons, and Taiwan's is about 200 tons. World demand is growing at a rate of 20-28% every year. In addition, nano-scale silver powder is also used in tungsten-silver ultra-high temperature sweating materials, silver-cadmium oxide, silver-tungsten carbide, silver-chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 张丽英吴成义赵放
Owner UNIV OF SCI & TECH BEIJING
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