Process for preparing nm-class silver powder

A nano-scale silver powder technology, applied in the field of liquid phase preparation of nano-scale silver powder, can solve the problems of inability to meet the electronic industry, unsolved agglomeration problem, self-sintering or agglomeration, etc. High solid density effect

Active Publication Date: 2009-01-14
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-silver powder used in the electronic paste industry requires good dispersibility and high tap density. However, it is precisely because of the high activity of the nano-silver powder that it is easy to self-sinter or agglomerate. The so-called nano-silver powder on the market generally does not solve the problem of agglomeration and has poor dispersibility. , the surface activity is not high, the tap density is low, it is difficult for the organic carrier to completely wet the powder when preparing the slurry, the particle size is large, and the silver layer is not dense after sintering, the shrinkage rate is large, there are many pores, and the electrical properties are poor, which cannot meet the requirements. The needs of the further development of the electronics industry

Method used

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  • Process for preparing nm-class silver powder
  • Process for preparing nm-class silver powder
  • Process for preparing nm-class silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 0.8g gum rosin and add to 50ml butanol, stir to dissolve, add 25.5g Ag 2 CO 3 powder and 0.5g triethanolamine, stir evenly to obtain a suspension, heat up the suspension while stirring, control the temperature rise rate to 1°C / min, keep the temperature at 80-100°C, add 5g triethanolamine dropwise within 2-4 hours, add Stir again for 0.5-1h after finishing, lower the temperature to below 50°C, stop stirring, let the silver powder settle, stack the filter cloth and filter paper in the Buchner filter, wash the precipitated powder with alcohol for more than 3 times, and use liquid resin surface chemical treatment , Dry at ≤80°C to obtain nano-silver powder. The performance analysis of the powder is shown in Table 1. The effect diagram of the influence of the particle size of the powder on the thickness of the printing layer and the amount of silver is shown in the attached figure 2 As shown, the powder has uniform size, good dispersion and large specific surface ar...

Embodiment 2

[0018] In Example 1, the Ag 2 CO 3 Change to Ag 2 O, consumption is 21.5g. The performance analysis of the powder is shown in Table 1. The effect diagram of the influence of the particle size of the powder on the thickness of the printing layer and the amount of silver is shown in the attached figure 2 As shown, the powder has uniform size, good dispersion and large specific surface area. image 3 shown. The purity of the powder is high, as shown in Figure 4.

Embodiment 3

[0020] In Example 1, the heating rate was changed from 1° C. / min to 2° C. / min. The performance analysis of the powder is shown in Table 1. The effect diagram of the influence of the particle size of the powder on the thickness of the printing layer and the amount of silver is shown in the attached figure 2 As shown, the powder has uniform size, good dispersion and large specific surface area. image 3 shown. The purity of the powder is high, as shown in Figure 4.

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Abstract

The present invention discloses a method for preparing the nanometer-level silver powder, and comprises the steps such as the reduction reaction, the surface chemical treatment and the drying, wherein, the reduction reaction: (1) organic acid dispersing agent is added into the organic alcohol solution to be mixed, and then is added with silver-contained material and neovaricaine reducer to be uniformly mixed, and to obtain the suspension solution; (2) the suspension solution that is obtained in the mixing step (1) is heated to 80 to 100 DEG C; (3) within 2 to 4 hours, neovaricaine reducer is dropped into the suspension solution that is obtained in step (2), and is continued to be mixed for 0.5 to 1 hour, and is cooled to 50 DEG C plus or minus 5 DEG C, and is kept still to precipitate the silver powder; the silver-contained material is one or two mixtures of silver carbonate and silver oxide. The method of the present invention is simple and easy to be done; the produced nanometer silver powder has high purity, good dispersing property, and small grain large specific surface and wide drying temperature range; the powder can be effectively prevented from being self sintered or clustered, and is easy to be dispersed to be organic carrier.

Description

technical field [0001] The invention relates to a liquid-phase preparation method of nano-scale silver powder, in particular to a liquid-phase preparation method of nano-scale silver powder applied to electronic paste. Background technique [0002] Silver powder is the most widely used precious metal powder in the electrical and electronic industry. The traditional industrial silver powder has a particle size greater than 0.2 microns, which can be used to make isotropic conductive adhesives, conductive coatings, and sintered silver pastes, such as capacitors, The typical sintering temperature for functional electrode pastes for inductors, resistors and other ceramic components is 650-850°C. The sintering temperature is high, the energy consumption is high, and the performance requirements for the ceramic substrate are also high. The nano-silver powder used in the electronic paste industry requires good dispersibility and high tap density. However, it is precisely because of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 孟淑媛吴海斌唐元勋
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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