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A method for enriching nano-silver particles in water

A nano-silver particle, nano-silver technology, applied in metal processing equipment, transportation and packaging, can solve problems such as high toxicity, high energy consumption, and many safety hazards, and achieve high dispersibility, high conductivity, and simple and easy operation. row effect

Inactive Publication Date: 2018-10-23
青岛北印恩马科创孵化有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the dual effects of stability and conductivity, the concentration of nano-silver particles prepared in the water environment is very low (generally less than 10%), which brings production efficiency problems for the later preparation of conductive inks with high silver content
The commonly used enrichment methods include acetone coagulation, centrifugation and salting out, etc., which have the following defects: acetone coagulation needs to use a large amount of acetone, which has many safety hazards and high toxicity; low centrifugation efficiency, high energy consumption, and poor dispersion of separated particles ; The salting out method is easy to destroy the stability of the particles, and it is difficult to redisperse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Preparation of nano-silver dispersion: Weigh 2 g of polyvinylpyrrolidone K30 and 12.7 g of silver nitrate respectively, add to 38 g of water, stir and dissolve fully, add 10 ml of hydrazine hydrate drop by drop, keep the liquid at 5 °C for 2 h.

[0016] 2. Enrichment of nano-silver: Add 1.5 g of oleic acid into 100 g of ethanol, stir and mix well. Take 36 ml of oleic acid-alcohol solution in a beaker and seal it, and heat it in a water bath to maintain 30 °C. Take 20 ml of the nano-silver dispersion prepared in 1 and add it dropwise to the oleic acid-alcohol solution, adjust the pH = 3 with dilute nitric acid, stir for 30-60 min to achieve solid-liquid separation, filter, wash, and dry to obtain nano-silver powder.

Embodiment 2

[0018] 1. Preparation of nano-silver dispersion: Take 2 g of polyvinyl alcohol 1788 and 12.7 g of silver nitrate and add it to 38 g of water. After stirring and fully dissolving, add 10 ml of hydrazine hydrate drop by drop, and keep the liquid at 9 °C for 2 h.

[0019] 2. Enrichment of nano-silver: Add 3.0 g of oleic acid to 100 g of ethanol, stir and mix well. Take 20 ml of the nano-silver dispersion prepared in 1 in a beaker, add 40 ml of oleic acid-alcohol solution dropwise into the oleic acid-alcohol solution, adjust the pH = 4 with dilute nitric acid, and react at 35 °C for 60 min. After 60 min, the solid-liquid was separated, filtered, and the obtained precipitate was repeatedly washed with ethanol and water for 2-3 times, and dried to obtain nano-silver.

Embodiment 3

[0021] 1. Preparation of nano-silver dispersion: Take 2 g of polyvinylpyrrolidone K60 and 12.7 g of silver nitrate and add it to 38 g of water. After stirring and fully dissolving, add 10 ml of hydrazine hydrate drop by drop and keep the liquid at 12 °C for 2 h.

[0022] 2. Enrichment of nano-silver: Add 4.5 g nonanoic acid to 100 g ethanol, stir and mix well. Take 48 ml nonanoic acid-alcohol solution in a beaker, seal the container with plastic wrap, and heat it to 40 °C in a water bath. Take 20 ml of the nano-silver dispersion prepared in 1 and add it dropwise into the nonanoic acid-alcohol solution, adjust the pH to 4.5 with dilute nitric acid, and react at 40 °C for 60 min. After 60 min, the solid-liquid was separated, filtered, and the obtained precipitate was repeatedly washed with ethanol and water for 2-3 times, and dried to obtain nano-silver.

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Abstract

A method for enriching nano-silver particles in water, comprising the following steps: 1) preparing a nano-silver dispersion: adding a hydrazine hydrate solution dropwise to an aqueous solution of silver nitrate and a polymer protective agent to react to obtain a nano-silver dispersion; 2 ) Enrichment of nano-silver: mix the nano-silver dispersion with organic acid-alcohol solution according to a certain ratio, fully react; deposit after surface modification, filter, wash, and dry to obtain nano-silver particles. Its advantages are: the present invention provides a simple method for enriching nano-silver particles in water, using hydroxyl groups on the surface of the particles and organic acids to carry out dehydration and condensation reactions, so that the particles change from hydrophilic to lipophilic; the present invention is simple and easy to operate OK, using an organic acid-alcohol system to enrich nano-silver particles has the advantages of environmental protection and high efficiency, and can be applied to industrial production; the nano-silver powder obtained by the present invention has high conductivity, and the surface is rich in organic groups. It has high dispersibility; it has the advantages of batch and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of printing, and in particular relates to a method and a device for enriching nano-silver particles in water. Background technique [0002] With the development of electronic products in the direction of flexibility and miniaturization, traditional micron conductive inks can no longer meet the requirements of low processing temperature and smaller feature size. Nano-silver conductive ink has become an inevitable trend in the development of conductive paste due to its low heat treatment temperature and the advantages of meeting small-size processing technology. Synthesizing nano-silver particles in an aqueous environment and redispersing them after enrichment is the preferred process for the large-scale preparation of conductive inks. Due to the dual effects of stability and conductivity, the concentration of nano-silver particles prepared in the water environment is very low (generally less than 10%), which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/102
Inventor 胡旭伟呼守蒂朱磊王默常鹏飞
Owner 青岛北印恩马科创孵化有限公司