Bentonite-loaded nano silver antibacterial agent and preparation method thereof

A preparation process and technology of bentonite, applied in the directions of biocides, disinfectants, animal repellents, etc., can solve the problems of easy discoloration of silver antibacterial agents, limited application scope, unstable properties, etc., and achieve low cost, simple preparation process, Effects that increase stability and persistence

Inactive Publication Date: 2014-09-03
朱岳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a bentonite-loaded nano-silver antibacterial agent and its preparation process, and the nano-silver is firmly loaded between the sheets of bentonite to solve the problem of easy discoloration, unstable properties and application range comparison of existing silver antibacterial agents Limitation problems, to meet the needs of its use in the manufacture of antibacterial plastics, antibacterial textiles and daily chemical antibacterial materials

Method used

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  • Bentonite-loaded nano silver antibacterial agent and preparation method thereof
  • Bentonite-loaded nano silver antibacterial agent and preparation method thereof
  • Bentonite-loaded nano silver antibacterial agent and preparation method thereof

Examples

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Embodiment 1

[0030] Take 15g of bentonite and place it in a three-necked flask, add 400mL of 1.5mol / L dilute sulfuric acid solution, heat in a water bath at 96°C, and stir at a speed of 2000-3000r / min for 4h. The above mixed solution was separated in a centrifuge at 3000r / min for 20min, the separated solution was poured out, and the bentonite was washed with deionized water until the pH was close to 5-6 to obtain acidified modified bentonite.

[0031] Take 10g of acidified modified bentonite, add 200mL of deionized water, stir slowly in a water bath at 60°C, add 100mL of dispersion stabilizer sodium polyphosphate aqueous solution with a concentration of 0.5wt%, adjust the pH to 7 after stirring for 30min, add 100mL of 0.04mol / L silver-ammonia solution, adjust the pH value to 9 with dilute sulfuric acid or dilute ammonia water, and react with stirring at a speed of 600-700r / min for 3h under the irradiation of an ultraviolet light with a power of 8W. Take the upper layer of turbid liquid, c...

Embodiment 2

[0033] Take 10g of acidified modified bentonite, add 200mL of deionized water, stir slowly in a water bath at 40°C, add 100mL of dispersion stabilizer sodium polyphosphate aqueous solution with a concentration of 0.2wt%, stir for 30min, adjust the pH value to 7.5, add 100mL of 0.1mol / L silver-ammonia solution, adjust the pH value to 11 with dilute sulfuric acid or dilute ammonia water, and react with stirring at a speed of 600-700r / min for 3h under the irradiation of an ultraviolet light with a power of 8W. Take the upper layer of turbid liquid, centrifuge, and wash the separated product with deionized water until it is dropped into dilute hydrochloric acid solution without precipitation. The cleaned product is dispersed by adding absolute ethanol, dried in an oven at 60°C, ground, and passed through a 400-mesh sieve to prepare a bentonite-loaded nano-silver antibacterial agent.

Embodiment 3

[0035] Take 10g of acidified modified bentonite, add 200mL of deionized water, stir slowly in a water bath at 80°C, add 100mL of a dispersion stabilizer sodium polyphosphate aqueous solution with a concentration of 0.5wt%, stir for 30min, adjust the pH value to 7, add 100mL of 0.01mol / L silver ammonia solution, adjust the pH value to 8 with dilute sulfuric acid or dilute ammonia water, under the irradiation of ultraviolet light with a power of 40W, stir and react at a speed of 600-700r / min for 3h. Take the upper layer of turbid liquid, centrifuge, and wash the separated product with deionized water until it is dropped into dilute hydrochloric acid solution without precipitation. The cleaned product is dispersed by adding absolute ethanol, dried in an oven at 60°C, ground, and passed through a 400-mesh sieve to prepare a bentonite-loaded nano-silver antibacterial agent.

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Abstract

The invention discloses a bentonite-loaded nano silver antibacterial agent and a preparation method thereof. The preparation method comprises the following steps: carrying out acid treatment on bentonite to obtain acidification-modified bentonite; putting the acidification-modified bentonite into a dispersion stabilizer sodium polyphosphate water solution; adding a silver-ammonia solution and carrying out an illumination reaction to insert compound powder composed of nano silver and silver ammino ions into a bentonite sheet layer, so as to obtain the bentonite-loaded nano silver antibacterial agent. The grain diameter of the antibacterial agent compound powder prepared by the invention is 0.1-5 microns and the silver content is 0.1-15wt%; a bacteriostasis circle to colon bacillus and staphylococcus aureus is more than or equal to 10mm and the minimal inhibitory concentration is 10-200 micrograms / milliliter; the bentonite-loaded nano silver antibacterial agent is suitable for being used for preparing antibacterial plastic, antibacterial textiles, domestic chemical antibacterial materials and the like.

Description

technical field [0001] The invention relates to a nano-silver antibacterial agent, in particular to a nano-silver antibacterial agent which takes bentonite as a carrier and firmly loads nano-silver between bentonite sheets, and a preparation process of the nano-silver antibacterial agent. Background technique [0002] Antibacterial agents can usually be divided into three categories: natural antibacterial agents, organic antibacterial agents and inorganic antibacterial agents. Natural antibacterial agents have the advantages of being safe, non-toxic, broad-spectrum, and good color stability, but their disadvantages such as difficult processing, poor heat resistance, and limited resources have become problems that restrict their development. Organic antibacterial agents can effectively inhibit the growth and reproduction of harmful bacteria and molds, and have quick results, but they are poor in thermal stability, easy to decompose, poor in persistence, and high in toxicity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N25/08A01P1/00
Inventor 朱岳韩红青温卫东戴晋明魏丽乔
Owner 朱岳
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