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Silver powder and process for manufacturing same

A manufacturing method and technology of silver powder, applied in manufacturing tools, cable/conductor manufacturing, metal/alloy conductors, etc., can solve problems such as clogging, affecting productivity, affecting the mixing performance of paste making, screen printing printability, etc., and achieve dispersion Excellent performance and the effect of suppressing coarse powder

Inactive Publication Date: 2015-06-24
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is undesirable for the generated flakes to remain in the paste directly, so they are removed by sieving with a sieve, but if there are too many flakes generated, there will be problems such as clogging between the sieves with coarse powder, so that it cannot be effectively ground removal, leading to a severe impact on productivity
[0009] In addition, when flakes are formed in the paste as described above, when screen printing is performed using this paste, the fine screen will be clogged with coarse flakes, making it difficult to print the pattern accurately.
[0010] In this way, the formation of flakes will significantly affect the kneadability when making pastes and the printability when screen printing

Method used

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  • Silver powder and process for manufacturing same
  • Silver powder and process for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] 2492 g of silver chloride (manufactured by Sumitomo Metal Mining Co., Ltd.) was thrown into 36 L of 25% ammonia water maintained at 36° C. in a warm bath at 38° C. while stirring to prepare a silver complex solution, and the obtained silver complex The solution was maintained at 36°C in a warm bath.

[0104] On the other hand, 1068 g of ascorbic acid (manufactured by Kanto Chemical Co., Ltd., reagent) as a reducing agent was dissolved in 14 L of pure water at 36° C. to prepare a reducing agent solution. Next, 64.1 g of polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA205, 3.5% by mass relative to silver) as a water-soluble polymer was dissolved in 550 ml of pure water at 36°C, and mixed with the reducing agent solution .

[0105] Using a mono-pump (manufactured by Bingshen Equipment Co., Ltd.), the prepared silver complex solution and reducing agent solution were 2.7 L / min for the silver complex solution and 0.9 L / min for the reducing agent solution. The speed...

Embodiment 2

[0116] In Example 2, silver powder was produced similarly to Example 1 except having made the quantity of the polyvinyl alcohol which is a water-soluble polymer into 183 g (10 mass % with respect to silver).

[0117] The obtained silver powder was evaluated in the same manner as in Example 1. As a result, the aggregation force was 0.14 N / cm 2 , with a compression ratio of 35.0%. In addition, the absorption amount of dibutyl phthalate measured by the JIS-K6217-4 method was 7.0 ml / 100 g.

[0118] In addition, the average particle diameter DS of the silver powder measured by SEM observation was 1.05 micrometers. In addition, the silver powder was dispersed in isopropyl alcohol, and the volume-integrated average particle diameter D50 measured by the laser diffraction scattering method was 2.16 μm. Therefore, the ratio obtained by D50 / DS was 2.06. In addition, the specific surface area SSA measured by the BET method 1 0.46m 2 / g, the specific surface area SSA calculated from t...

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Abstract

The present invention pertains to a silver powder which, when preparing a silver paste, exhibits excellent dispersibility in a solvent and which minimizes the generation of coarse powder particles such as flakes during kneading. The present invention provides a silver powder which exhibits a cohesive force of -0.2 to 0.7N / cm2, a compressibility of 20 to 50% as determined by powder-bed shear stress measurement, and a dibutyl phthalate absorption of 3.0 to 9.0ml / 100g as determined according to JIS-K6217-4 method.

Description

technical field [0001] The present invention relates to silver powder and a method for producing the same. More specifically, the present invention relates to silver powder as a main component of a silver paste used for forming wiring layers, electrodes, and the like of electronic devices, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. Japanese Patent Application No. 2011-128015 for which it applied in Japan on June 8, 2011, and these applications are referred, and are used for this application. Background technique [0003] Silver pastes such as resin-type silver pastes and calcined-type silver pastes are widely used in the formation of wiring layers, electrodes, and the like in electronic devices. Conductive films such as wiring layers and electrodes are formed by applying or printing a silver paste, followed by heat curing or heat firing. [0004] For example, the resin-type silver paste is composed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24H01B5/00H01B13/00B22F1/12
CPCH01B1/02H01B1/22B22F1/12B23K9/24B23K9/00H01B5/00H01B13/00
Inventor 川岛刚冈田美香石田荣治二瓶知伦寺尾俊昭
Owner SUMITOMO METAL MINING CO LTD