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Method for preparing nano silver powder

A technology of nano-silver powder and silver nitrate, which is applied in the field of preparation of nano-silver powder, can solve the problems of high production cost, difficult process control, and high difficulty of industrialization, and achieve the effects of improving productivity, facilitating washing, and reducing washing difficulty

Inactive Publication Date: 2009-04-15
桐柏鑫泓银制品有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The physical method can obtain nano-silver powder with higher purity, but the production cost is high, the investment is large, the output is low, and the industrialization is difficult. It is not suitable for the current economic conditions and industrial foundation of our country.
The publication number is CN1266761A, and the invention patent application "Preparation Method of Nanoscale Silver Powder" is to dissolve silver nitrate in water, add ammonia water to make silver ammonia solution, and then slowly add the reducing agent solution made of reducing agent and protective agent. It is ascorbic acid, hydrazine hydrate or sodium borohydride, the protective agent is polyvinylpyrrolidone (PVP), alkyl mercaptan (RSH), oleic acid or palmitic acid, the silver in the silver ammonia solution is reduced to nano-scale silver powder, filtered After going out silver powder, it is soaked in the oleic acid as passivating agent, filters and removes oleic acid, after vacuum drying, namely obtains nanoscale silver powder, the nanoscale silver powder that this inventive method makes stability, dispersibility are good, but its The process is difficult to control, easy to generate explosive silver, the process is complex, and industrial production is difficult

Method used

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  • Method for preparing nano silver powder

Examples

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Effect test

Embodiment 1

[0024] A preparation method of nanometer silver powder, it comprises the following steps:

[0025] a. 30g of solid silver nitrate and polyvinyl alcohol with a mass concentration of 3% are prepared into a 1.6mol / L silver nitrate solution, and then 6ml of emulsifier triethanolamine with a mass concentration of about 56% is added to fully emulsify it;

[0026] b. After it is fully emulsified, add 20ml of reducing agent glycerin, stir evenly, and then add 37ml of activator NaoH solution with a mass concentration of about 13%;

[0027] c. Adjust the reaction temperature to 26°C, adjust the stirring speed to 56 rpm, and make the reaction run smoothly for 30 minutes;

[0028] d. After the reaction is completed, add an appropriate amount of deionized water, and use a vacuum pump to filter and wash for 5 to 6 times;

[0029] e. Then dehydrate with absolute ethanol;

[0030] f. After dehydration, add 0.1g / L drying protectant benzotriazole 22ml;

[0031] g. After drying at 50°C for 20...

Embodiment 2

[0033] A preparation method of nanometer silver powder, it comprises the following steps:

[0034] a. 40g of solid silver nitrate and polyvinyl alcohol with a mass concentration of 5% are formulated into a silver nitrate solution of 2.0mol / L, and then 6ml of emulsifier triethanolamine with a mass concentration of about 64% is added to make it fully emulsified;

[0035] b. After it is fully emulsified, add an appropriate amount of 40ml of reducing agent glycerin, stir evenly, and then add 44ml of activator NaoH solution with a mass concentration of about 17%;

[0036] c. Adjust the reaction temperature to 33°C, adjust the stirring speed to 74 rpm, and make the reaction run smoothly for 30 minutes;

[0037] d. After the reaction is completed, add an appropriate amount of deionized water, and use a vacuum pump to filter and wash for 5 to 6 times;

[0038] e. Then dehydrate with absolute ethanol;

[0039] f. After dehydration, add 0.1g / L desiccation protection agent benzotriazol...

Embodiment 3

[0042] A preparation method of nanometer silver powder, it comprises the following steps:

[0043] a. 35g of solid silver nitrate and polyvinyl alcohol with a mass concentration of 4% are mixed with a silver nitrate solution of 1.8mol / L, then adding 6ml of emulsifier triethanolamine with a mass concentration of about 60% to make it fully emulsified;

[0044] b. After it is fully emulsified, add 30ml of reducing agent glycerin, stir evenly, and then add 40ml of activator NaoH solution with a mass concentration of 15%;

[0045] c. Adjust the reaction temperature to 27°C, adjust the stirring speed to 60 rpm, and make the reaction run smoothly for 30 minutes;

[0046] d. After the reaction is completed, add an appropriate amount of deionized water, and use a vacuum pump to filter and wash for 5 to 6 times;

[0047] e. Then dehydrate with absolute ethanol;

[0048] f. After dehydration, add 0.1g / L desiccation protection agent benzotriazole 35ml;

[0049] g. After drying at 50°C ...

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Abstract

The invention discloses a method for preparing nanometer silver powders. The method comprises the following steps: a. mixing AgNO+, 4 percent of polyvinyl alcohol and about 60 percent of emulsifier triethanolamine; b. adding proper amount of glycerol into the mixture; c. smoothly reacting the mixture for 30 minutes; d. adding deionized water into the mixture, and performing pumping filtration washing on the mixture through a vacuum pump; e. dehydrating the mixture by using anhydrous alcohol; f. adding 20 to 50 milliliters of 0.1 gram per liter dried protective agent benzotriazole after the dehydration; and g. drying the mixture for 18 to 24 hours at a temperature of 50 DEG C to obtain the nanometer silver powders of which the particle diameter is between 50 and 100 nanometers. The method for preparing the nanometer silver powders has the advantages of simple production process, low production cost, low investment of equipment, easy process control, and high yield.

Description

technical field [0001] The invention belongs to the technical field of silver powder preparation, in particular to a preparation method of nano silver powder. Background technique [0002] There are many preparation methods for nano-silver powder, but at present in my country, physical methods and chemical reduction methods are mainly used. The physical method can obtain nano-silver powder with higher purity, but the production cost is high, the investment is large, the output is low, and the industrialization is difficult, which is not suitable for the current economic conditions and industrial foundation of our country. The publication number is CN1266761A, and the invention patent application "Preparation Method of Nanoscale Silver Powder" is to dissolve silver nitrate in water, add ammonia water to make silver ammonia solution, and then slowly add the reducing agent solution made of reducing agent and protective agent. It is ascorbic acid, hydrazine hydrate or sodium bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 高玲凡王学成
Owner 桐柏鑫泓银制品有限责任公司
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