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Nano-silver complex solution and preparation method thereof

A technology of nano-silver and nano-silver powder is applied in the fields of botanical equipment and methods, chemicals for biological control, food preservation, etc., and can solve problems such as unfavorable popularization and use.

Active Publication Date: 2017-10-17
广州市科瑨材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the nano-silver sol prepared by chemical method has a good antibacterial effect, but it has a dark or light color, which is not conducive to large-scale promotion and use.

Method used

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  • Nano-silver complex solution and preparation method thereof
  • Nano-silver complex solution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 1g of nano-silver powder is added to 100ml of 1.5wt% PVP aqueous solution, and ultrasonically stirred for 1h to obtain a suspension of nano-silver;

[0034] (2) 8g sodium persulfate is added to 350ml deionized water, stirred and dissolved to obtain sodium persulfate solution;

[0035] (3) Add the sodium persulfate solution described in step (2) into a 1L flask, heat in a water bath (35°C), then add the nano-silver suspension solution described in step (1) to the sodium persulfate solution, and continue the water bath Heating and stirring for 24 hours to obtain a complex solution;

[0036] (4) 5g of citric acid is added to the complex solution described in step (3), stir evenly, adjust the pH to 5 with 1M NaOH solution, add water to 500ml, and vacuum filter with a 0.45 micron ultrafiltration membrane to obtain 2000ppm Colorless transparent nano-silver complex solution.

Embodiment 2

[0038] (1) 1g of nano-silver powder is added to 100ml of 2wt% PEG400 aqueous solution, and ultrasonically stirred for 1h to obtain a suspension of nano-silver;

[0039] (2) 5g ammonium persulfate is added to 850ml deionized water, stirred and dissolved to obtain ammonium persulfate solution;

[0040] (3) Add the ammonium persulfate solution described in step (2) into a 1L flask, heat in a water bath (50° C.), then add the nano-silver suspension solution described in step (1) to the ammonium persulfate solution, and continue the water bath Heating and stirring for 12 hours to obtain a complex solution;

[0041] (4) 5g tartaric acid is joined in the complex solution described in step (3), stir evenly, adjust pH to be 5 with 0.2M sodium carbonate solution, add water and be settled to 1000mL, vacuum filter with 0.45 micron ultrafiltration membrane, obtain 1000ppm colorless and transparent nano-silver complex solution.

Embodiment 3

[0043] (1) 20g of nano-silver powder was added to 1000mL of 5wt% PVP aqueous solution, and ultrasonically stirred for 3h to obtain a suspension of nano-silver;

[0044] (2) 50g potassium persulfate is added to 900ml deionized water, stirred and dissolved to obtain a strong oxidation complexing agent solution;

[0045] (3) The strong oxidation complexing agent solution described in step (2) is added in the 5L flask, and water bath heating (65 ℃), adds the nano-silver described in step (1) again in the super strong oxidation complexing agent solution Suspend the solution, continue heating and stirring in a water bath for 24 hours to obtain a complex solution;

[0046] (4) Add 10 g of citric acid to the complex solution described in step (3), stir evenly, adjust the pH to 7.5 with 0.2M sodium silicate solution, add water to 2000 mL, and vacuum filter with a 0.45 micron ultrafiltration membrane , to obtain 10000ppm colorless and transparent nano-silver complex solution.

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Abstract

The invention relates to a nano-silver complex solution and a preparation method thereof. Preparation raw materials of the nano-silver complex solution comprise water and the following components: 1-10,000 ppm of nano-silver powder, 0.01-10wt% of a strong oxidative complexing agent, 0.1-1% of a complexing stabilizer and 0.1-2.5wt% of an aqueous dispersant. The preparation method comprises the following steps: adding the nano-silver powder in an aqueous dispersant solution according to a certain ratio; stirring and adding the mixture in a certain amount of strong oxidative complexing agent aqueous solution; carrying out water-bath heating and stirring for a certain time; adding the complexing stabilizer and stirring uniformly; regulating pH of the solution; adding water for dilution to a certain volume; and filtering the solution by using an ultra-filtration film to obtain the nano-silver complex solution. The prepared nano-silver complex solution has good sterilizing effect; after the nano-silver complex solution is detected by Guangdong Microbiological Analysis Detection Center according to Technical standard for Disinfection: 2002, when the sample is diluted into 25 ppm of nano-silver complex solution, the rate of killing to colibacillus, staphylococcus aureus and candida albicans reaches 99.6% or above; when the sample is diluted into 5 ppm of nano-silver complex solution, the rate of killing to colibacillus reaches 99.98% or above, and the rate of disinfection to the staphylococcus aureus reaches 98.9% or above. The nano-silver complex liquid is obvious in disinfection effect.

Description

technical field [0001] The invention relates to the field of materials, in particular to a nano-silver complex solution and a preparation method thereof. Background technique [0002] In people's daily life, there are many pathogenic bacteria such as bacteria, molds and yeasts, which seriously threaten human health. According to the survey of Japan's "Environmental Management Magazine", after wearing clean shirts and underwear for 24 hours, every cm 2 The bacterial count is as high as 4.4×10 6 Although there are differences in different seasons, the pollution is also serious. According to the statistics of the "WHO" magazine in the United States, 52 million people died in the world in 1995, of which 17 million were caused by bacterial infections, accounting for about one-third. Bacterial pathogenic microorganisms have become one of the main killers of human health. The nationwide pathogenic Escherichia coli 0-157 infection in Japan in 1996 once caused global panic. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N25/02A01P1/00A01P3/00A23L3/358
CPCA01N25/02A01N59/16A23L3/358A23V2002/00A23V2200/10A23V2250/1562
Inventor 马清金
Owner 广州市科瑨材料科技有限公司