Preparation method of nanometer silver powder with particles controllable

A nano-silver powder and particle technology, which is applied in the field of preparation of nano-silver powder, can solve the problems that the production efficiency has not been effectively improved, the method of step-by-step control is cumbersome, and the concentration of the precursor cannot be too high, so as to achieve rapid purification, easy rapid scale-up, The effect of simplifying the post-processing process

Active Publication Date: 2014-09-03
福建富轩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent solves the problem of controlling the growth of silver powder particle size, the method of seed crystal growth and step-by-step control is too cumbersome, and due to the natural defect that the concentration of precursors for seed crystal growth cannot be too high, the production efficiency not effectively improved

Method used

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  • Preparation method of nanometer silver powder with particles controllable
  • Preparation method of nanometer silver powder with particles controllable
  • Preparation method of nanometer silver powder with particles controllable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 with figure 2 Shown, a kind of preparation method of particle controllable nano-silver powder comprises the following steps,

[0028] (1) Miscible silver nitrate and polyvinylpyrrolidone with water in proportion, after dissolution, the concentration of silver nitrate is 0.02 mol / liter, the concentration of polyvinylpyrrolidone is 0.02 mmol / liter, and the oxidation mixed solution A is obtained;

[0029] (2) Add ascorbic acid, an environmentally friendly, mild and weak reducing agent, into water for stirring and dissolving, then adjust the pH value of the solution to 9 with monomethylamine, and the concentration of the reducing agent is 0.2 mol / liter, and obtain a reducing solution after stirring and dissolving B;

[0030] (3) Pump the oxidized mixed solution A obtained in step (1) and the reduced solution B obtained in step (2) into the spray port at a volume ratio of 1:1, and use hot air with a temperature of 50 °C at a rate of 200 kg / h The speed is...

Embodiment 2

[0033] Such as figure 1 with image 3 Shown, a kind of preparation method of particle controllable nano-silver powder comprises the following steps,

[0034] (1) Miscible silver nitrate and polyvinyl alcohol with water in proportion, after dissolution, the concentration of silver nitrate is 0.045 mol / liter, and the concentration of polyvinyl alcohol is 0.025 mmol / liter, and the oxidation mixed solution A is obtained;

[0035] (2) Add potassium citrate, an environmentally friendly, mild and weak reducing agent, into water for stirring and dissolving, then adjust the pH value of the solution to 11 with ammonia water, in which the concentration of reducing agent is 0.4 mol / liter, and obtain a reducing solution after stirring and dissolving B;

[0036] (3) Pump the oxidized mixed solution A obtained in step (1) and the reduced solution B obtained in step (2) into the spray port at a volume ratio of 1:2, and use hot air with a temperature of 70 °C at a rate of 100 kg / h The speed...

Embodiment 3

[0039] Such as figure 1 with Figure 4 Shown, a kind of preparation method of particle controllable nano-silver powder comprises the following steps,

[0040] (1) Miscible silver nitrate and polyvinylpyrrolidone with water in proportion, after dissolution, the concentration of silver nitrate is 0.05 mol / liter, and the concentration of polyvinylpyrrolidone is 0.015 mmol / liter, and the oxidation mixed solution A is obtained;

[0041] (2) Add environment-friendly, mild and weak reducing agent tannic acid into water for stirring and dissolving, then adjust the pH value of the solution to 11 with a mixed solvent of ammonia water and dimethylamine, wherein the concentration of reducing agent is 0.4 mol / liter, Obtain reducing solution B after stirring and dissolving;

[0042] (3) Pump the oxidized mixed solution A obtained in step (1) and the reduced solution B obtained in step (2) into the spray port at a volume ratio of 2:3, and use hot air at a temperature of 80 °C at a rate of 30...

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Abstract

The invention discloses a preparation method of nanometer silver powder with particles controllable. The method includes the following steps that silver nitrate and dispersants are mixed with water in sequence in proportion so that an oxidizing mixed solution A can be obtained; reducing agents are added into water and stirred to be dissolved, then the pH value of the solution is regulated to range from 7.5 to 13.5 through small molecular amine, and a reducing solution B is obtained after stirring and dissolving; the oxidizing mixed solution A and the reducing solution B are pumped into a spraying nozzle according to the volume ratio ranging from 1:10 to 10:1, the oxidizing mixed solution A and the reducing solution B are sprayed into a spraying drying tower through hot air at the temperature ranging from 35 DEG C to 150 DEG C at the speed ranging from 1 kg / h to 8000 kg / h, and powdery solids are formed and subside to the bottom of the drying tower; powder airflow obtained through the reaction is pumped into a separation tower to be further separated, and finally, silver powder and redundant reducing agents are separated so that the nanometer silver powder can be obtained. The preparation method has the advantages of being simple in process, convenient to operate and capable of achieving mass production fast.

Description

technical field [0001] The invention relates to a preparation method of nano silver powder with controllable particles. Background technique [0002] Metal silver has excellent physical and chemical properties, such as the best room temperature electrical conductivity, thermal conductivity, strongest reflection properties, photosensitive imaging properties, antibacterial and anti-inflammatory properties, etc., making it widely used in modern industrial fields. Silver is also the cheapest noble metal that resists high temperature oxidation. Taking advantage of its electrical and thermal conductivity, silver powder is applied to conductive paste, making it an indispensable functional material in the electronics industry. Due to the small particle size and high activity of nano-silver powder, it can effectively adjust and improve the viscosity, rheology, thixotropy and sintering activity of silver conductive paste. Nano-silver powder has become one of the main application dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 谷小虎黄友科苏冬王善生
Owner 福建富轩科技有限公司
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