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Nano-silver dispersion liquid and preparation method thereof

A nano-silver and dispersion technology, applied in nanotechnology, sol preparation, nanotechnology, etc., can solve the problems of large nano-silver particle size, easy agglomeration, and affecting the antibacterial performance of nano-silver dispersion, and achieve simple operation and dispersion good effect

Inactive Publication Date: 2020-09-15
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of nano-silver in the nano-silver dispersion prepared at present is relatively large (generally 50nm), and it is easy to agglomerate, which directly affects the antibacterial performance of the nano-silver dispersion.

Method used

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  • Nano-silver dispersion liquid and preparation method thereof
  • Nano-silver dispersion liquid and preparation method thereof
  • Nano-silver dispersion liquid and preparation method thereof

Examples

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preparation example Construction

[0029] The invention provides a kind of preparation method of nano-silver dispersion liquid, comprises the following steps:

[0030] Mix γ-aminopropyltriethoxysilane, polyvinylpyrrolidone, sodium lauryl sulfate, silver nitrate and water to form a chelating action to obtain a chelated dispersion; before the mixing, γ-aminopropyltriethoxysilane Ethoxysilane is placed in the air for less than 5 minutes;

[0031] The sodium borohydride solution is added dropwise into the chelate dispersion, and an oxidation-reduction reaction occurs to obtain a nano-silver dispersion.

[0032] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0033] The invention mixes gamma-aminopropyltriethoxysilane, polyvinylpyrrolidone, sodium lauryl sulfate, silver nitrate and water for chelation to obtain a chelation dispersion.

[0034] In the present invention, after the mixing, the present invention preferably stirs ...

Embodiment 1

[0049] Put 0.3g of polyvinylpyrrolidone (PVP), 0.3g of sodium lauryl sulfate, 0.1g of silver nitrate and 0.26g of γ-aminopropyltriethoxysilane (KH-550, ready to use) in 89.034g of distilled water In a magnetic stirrer, stir at room temperature at a rate of 2000r / s for 30s for chelation to obtain a chelation dispersion;

[0050] Add 0.006g of sodium borohydride into 10g of distilled water and stir to dissolve to obtain a sodium borohydride solution;

[0051] Under the condition of stirring (2000r / s), the sodium borohydride solution is continuously added dropwise (1 drop per second) into the chelate dispersion, after the dropwise addition is completed, the nano-silver dispersion (dark brown without precipitation) is obtained, Wherein, the mass fraction of nano-silver is 0.06%.

Embodiment 2

[0053] The only difference with Example 1 is that the sodium borohydride solution is added dropwise in the chelating dispersion liquid every 5s, and after the dropwise addition is completed, the nano-silver dispersion (dark brown without precipitation) is obtained, wherein the mass of the nano-silver The score is 0.06%.

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Abstract

The invention provides a nano-silver dispersion liquid and a preparation method thereof, and belongs to the technical field of nano-silver preparation. The preparation method comprises the following steps of mixing gamma-aminopropyltriethoxysilane, polyvinylpyrrolidone, sodium dodecyl sulfate, silver nitrate and water, and performing chelation to obtain a chelating dispersion liquid, wherein the time for putting the gamma-aminopropyltriethoxysilane in air before mixing is less than 5 minutes; and dropwise adding a sodium borohydride solution into the chelating dispersion liquid, and performingredox reaction to obtain the nano-silver dispersion liquid. The nano-silver dispersion liquid prepared by the method disclosed by the invention is small in particle size of nano-silver and good in dispersity.

Description

technical field [0001] The invention relates to the technical field of nano-silver preparation, in particular to a nano-silver dispersion liquid and a preparation method thereof. Background technique [0002] During the service process, concrete is often subject to the attachment of microorganisms, which will cause marine biofouling and reduce the service life of concrete. Concrete corrosion caused by marine microorganisms has caused immeasurable losses to concrete buildings such as cross-sea bridges. [0003] In order to reduce the impact of marine microorganisms on concrete, people usually add nano-silver dispersion in the process of mixing concrete, so as to ensure the normal service environment of concrete and avoid the corrosion of iron bacteria and sulfur oxidizing bacteria on concrete. However, the particle size of nano-silver in the nano-silver dispersion prepared at present is relatively large (generally 50 nm), and agglomeration is easy to occur, which directly af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00B22F1/054B22F1/0545B22F1/065
CPCB22F9/24B82Y30/00B82Y40/00B22F1/065B22F1/054B22F1/0545C09K23/018B01J13/0008B01J13/0043C04B22/04C04B2111/20C08K3/28C08K3/38C08K5/41C08K5/5419C08K2003/0806C08L39/06
Inventor 李绍纯周安杰刘珺耿永娟陈旭高嵩
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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