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Prepn of nano silver oxide particle

A technology of nano-silver oxide and particles, which is applied in the direction of chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problems of insufficient purity of silver oxide products, large particle size of silver oxide particles, and uneven particle size distribution. , Narrow particle size distribution, small particle size effect

Inactive Publication Date: 2004-09-08
上海华实纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The purity of silver oxide products is not high enough and often contains some impurities;
[0004] 2) The particle size of silver oxide particles is large and the particle size distribution is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve silver nitrate in deionized water to form a 0.3mol / L solution, add polyacrylic acid with a molecular weight of 1000 to the silver nitrate solution in a proportion of 4% by weight, form a mixed solution, and add it in a proportion of 5% by weight Weight percent concentration is the ammoniacal liquor of 25%, forms silver ammine ion solution; Sodium hydroxide is dissolved in deionized water and forms 1.0mol / L solution, and silver ammine ion solution is added dropwise to In sodium hydroxide solution, a precipitate formed. The precipitate is taken out by centrifugation, washed three times with deionized water, and freeze-dried to obtain nano-silver oxide particles with a particle diameter between 10 nm and 30 nm.

Embodiment 2

[0014] Dissolve silver nitrate in deionized water to form a 1.5mol / L solution, add polyethylene glycol with a molecular weight of 5000 in a proportion of 7% by weight to the silver nitrate solution, form a mixed solution and add 10% by weight of Proportional addition of ammoniacal liquor with a weight percent concentration of 25% forms a silver ammonium ion solution; sodium hydroxide is dissolved in deionized water to form a 1.5mol / L solution, and the silver ammine ion solution is dripped while vigorously stirring the sodium hydroxide solution Added to sodium hydroxide solution to form a precipitate. The precipitate is taken out by centrifugation, washed three times with deionized water, and freeze-dried to obtain nano-silver oxide particles with a diameter between 30 nm and 60 nm.

Embodiment 3

[0016] Dissolve silver nitrate in deionized water to form a 0.5mol / L solution, add polyacrylic acid with a molecular weight of 2000 to the silver nitrate solution in a proportion of 5% by weight, form a mixed solution, and add it in a proportion of 5% by weight Weight percent concentration is the ammoniacal liquor of 25%, forms silver ammine ion solution; Potassium hydroxide is dissolved in deionized water and forms 1.0mol / L solution, and silver ammine ion solution is added dropwise to when vigorously stirring sodium hydroxide solution In sodium hydroxide solution, a precipitate formed. The precipitate is taken out by centrifugation, washed three times with deionized water, and freeze-dried to obtain nano-silver oxide particles with a particle diameter between 20 nm and 60 nm.

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Abstract

The preparation process of nano silver oxide particle includes the following steps: dissolving silver nitrate in deionized water to compound solution of 0.2-4.0 mol / L concentration; adding organic dispersant in 1-10 wt% and dropping ammonia water in 5-15 wt% under stirring to form silver-ammonia complexing ion solution; dropping the silver-ammonia complexing ion solution into alkali solution of 0.5-3.0 mol / L concentration under stirrig to form precipitate; centrifugally separation to separate precipitate; washing with deionized water and freeze drying. The nano silver oxide particle prepared in the process of the present invention has high purity, high stability, granularity of 10-100 nm and no obvious aggregation.

Description

technical field [0001] The invention relates to a method for preparing nanometer silver oxide particles. Background technique [0002] Silver oxide (Ag20) can be widely used in industries such as electronic components, button batteries, preservatives, antibacterial agents, glass colorants and abrasives, and chemical catalysts. Among them, silver oxide consumes the most in the electronic components industry. The current production of silver oxide is mainly based on the precipitation of silver oxide obtained by the reaction of silver nitrate solution and sodium hydroxide solution, followed by washing, separation and drying to obtain silver oxide particles. The main problems existing in the production of silver oxide at present are: [0003] 1) The purity of silver oxide products is not high enough and often contains some impurities; [0004] 2) The particle size of the silver oxide particles is large and the particle size distribution is uneven. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02C01G5/00
Inventor 翁文剑黄德欢韩高荣
Owner 上海华实纳米材料有限公司
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