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Method for preparing nanometer silver solution and nanometer silver powder by using high polymer as stabilizer

A technology of nano-silver and stabilizer is applied in the field of broad-spectrum antibacterial nano-silver solution and nano-silver powder preparation to achieve the effects of strong antibacterial ability, strong broad-spectrum antibacterial property and good stability

Inactive Publication Date: 2005-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above patents all use porous materials as carriers to prepare nano-silver powders, and do not involve the preparation of nano-silver solutions and nano-silver powders with polymers as stabilizers.

Method used

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  • Method for preparing nanometer silver solution and nanometer silver powder by using high polymer as stabilizer
  • Method for preparing nanometer silver solution and nanometer silver powder by using high polymer as stabilizer

Examples

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Embodiment 1

[0017] Preparation method of nano-silver solution using high polymer as stabilizer: Dissolve 5g of chitosan in 95ml of water, add 1.69g of silver nitrate, and slowly add 5ml of aqueous solution containing 3.5g of ascorbic acid under vigorous stirring. Stirring was continued for 5-6 hours. That is, a stable nano-silver solution is obtained.

[0018] The results of transmission electron microscopy show that the average size of nano-silver particles is 100nm.

Embodiment 2

[0020] Preparation method of nano-silver solution with high polymer as stabilizer: Dissolve 0.1g of methylcellulose in 95ml of water, add 34mg of silver nitrate, and slowly add 5ml of aqueous solution containing 9mg of formaldehyde under vigorous stirring. Stirring was continued for 5-6 hours. That is, a stable nano-silver solution is obtained.

[0021] The results of transmission electron microscopy show that the particle size distribution of nano-silver particles is 80-100nm, with an average of 90nm.

Embodiment 3

[0023] Preparation method of nano-silver solution with high polymer as stabilizer: Dissolve 1g of polyvinylpyrrolidone in 95ml of water, add 16mg of silver nitrate, and slowly add 5ml of aqueous solution containing 40mg of sodium borohydride under vigorous stirring. Stirring was continued for 12-15 hours. That is, a stable nano-silver solution is obtained.

[0024] The results of transmission electron microscopy showed that the particle size distribution of nano-silver particles was 20-30nm, with an average of 27nm.

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Abstract

The present invention discloses the preparation process of nanometer silver solution and nanometer silver powder with polymer as stabilizer. Water soluble polymer as stabilizer in solution of 0.001-0.05 g / ml solution and silver nitrate in solution of 0.001-0.1 mol / L are compounded and reduced with water soluble reductant in solution of 0.001-0.2 mol / L to obtain nanometer silver particle of 5-100 nm size. The nanometer silver particle in solution may be further deposited and washed with sodium hydroxide solution, dried and crushed to obtain nanometer silver particle of 5-100 nm size. The prepared solution may be used in medical article, and prepared nanometer silver powder may be used widely in household appliance, plastic product, paint, etc. The present invention is environment friendly, low in cost and simple in operation, and the prepared nanometer silver particle has extremely powerful antibiotic capacity and wide antibiotic spectrum.

Description

technical field [0001] The invention relates to a preparation method of a broad-spectrum antibacterial nano-silver solution and a nano-silver powder, in particular to a preparation method of a nano-silver solution and a nano-silver powder with a high polymer as a stabilizer. Background technique [0002] At present, most of the antibacterial materials used in the market are organic antibacterial agents, but organic antibacterial agents generally have poor antibacterial effects, and only have a strong anti-mold effect, and there are few organic antibacterial agents that have excellent inhibition on both. Moreover, organic antibacterial agents have poor heat resistance and stability, and their decomposition products and volatiles may be harmful to the human body; thus, inorganic antibacterial agents with strong inhibitory effects on bacteria, especially silver-based antibacterial agents, stand out. Compared with organic antibacterial agents, inorganic antibacterial materials h...

Claims

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Application Information

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IPC IPC(8): A01N25/10A01N59/16
Inventor 计剑付金红沈家骢
Owner ZHEJIANG UNIV
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