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Halloysite Ag-carrying antibacterial agent and preparation method thereof

An antibacterial agent, a technology of stone activity, applied in the field of inorganic silver-carrying antibacterial agent and its preparation, can solve the problems of unfavorable antibacterial agent antibacterial effect, slow release effect, weak antibacterial agent and the like, so that the antibacterial performance is not affected. , good slow release, good antibacterial effect

Inactive Publication Date: 2011-03-09
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have found that minerals such as kaolin and montmorillonite have too small pore size and poor loading capacity, which is not conducive to the antibacterial effect of antibacterial agents; while minerals such as diatomite and pumice have too large pore size, the loaded antibacterial agents are not firm and slow release. Ineffective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of halloysite silver-loaded antibacterial agent, it may further comprise the steps:

[0027] (1) Halloysite activation: Add halloysite with a purity of about 80wt% to 5wt% nitric acid solution, stir and activate it at room temperature, and the solid-liquid ratio of the reaction system is 10% by mass {ie (the halloysite’s mass / mass of dilute nitric acid solution)×100%=10%};

[0028] (2) Drying: The activated halloysite is centrifuged and dehydrated, and dried to obtain activated and dried halloysite;

[0029] (3) Loading: prepare a 3wt% silver nitrate solution, adjust the pH of the silver nitrate solution to 5 with dilute nitric acid, add activated and dried halloysite, stir at 40°C for 2 hours, and the solid-liquid ratio of the reaction system is based on mass percentage 20%;

[0030] (4) After the reaction is completed, the product is centrifugally filtered, the filter cake is washed, and then dried to obtain a halloysite silver-loaded broad-spec...

Embodiment 2

[0034] A preparation method of halloysite silver-loaded antibacterial agent, it may further comprise the steps:

[0035] (1) Halloysite activation: Add halloysite with a purity of about 80 wt% and a particle size of 200 mesh to 5 wt% nitric acid solution, stir and activate at room temperature for 0.5h, and the solid-to-liquid ratio of the reaction system is 10% by mass %;

[0036] (2) Drying: The activated halloysite is centrifuged and dehydrated, washed to neutrality, and dried at 95°C to obtain activated and dried halloysite;

[0037] (3) Loading: prepare a 3wt% silver nitrate solution with deionized water, adjust the pH of the silver nitrate solution to about 6 with 10wt% dilute nitric acid, add activated and dried halloysite, and stir at 40°C for 2 hours, The solid-to-liquid ratio of the reaction system is 20% by mass percentage;

[0038] (4) After the reaction, the product was centrifuged and filtered, and the filter cake was washed three times with deionized water, and...

Embodiment 3

[0041] A preparation method of halloysite silver-loaded antibacterial agent, it may further comprise the steps:

[0042] (1) Halloysite activation: add halloysite with a purity of about 95wt% and a particle size of 250 mesh to 1wt% nitric acid solution, stir and activate at room temperature for 1 hour, and the solid-to-liquid ratio of the reaction system is 5% by mass;

[0043] (2) Drying: The activated halloysite is centrifuged and dehydrated, washed to neutrality, and dried at 100°C to obtain activated and dried halloysite;

[0044] (3) Loading: Prepare 0.5wt% silver nitrate solution with deionized water, adjust the pH value of the silver nitrate solution to about 6 with 10wt% dilute nitric acid, add activated and dried halloysite, and stir at 60°C for 0.5 h, the solid-to-liquid ratio of the reaction system is 5% by mass percentage;

[0045] (4) After the reaction, the product was centrifuged and filtered, and the filter cake was washed three times with deionized water, and...

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Abstract

The invention provides a halloysite Ag-carrying antibacterial agent and a preparation method thereof. The preparation method comprises the following steps: (1) activating halloysite: adding the halloysite with the purity of not less than 80wt% to 1-5wt% of nitric acid solution, and stirring for activating at normal temperature, wherein, the solid-to-liquid ratio of a reaction system is 5-10% (mass percent); (2) drying: centrifugally dewatering and drying the activated halloysite to obtain the activated and dried halloysite; (3) loading: preparing 0.5-3wt% of silver nitrate solution, adjusting the pH value of the silver nitrate solution with dilute nitric acid to 5-6, adding the activated and dried halloysite, and stirring at the temperature of 40-60 DEG C for 0.5-2h, wherein, the solid-to-liquid ratio of a reaction system is 5-20% (mass percent); and (4) after reaction is ended, carrying out centrifugal filtration on the product, washing and drying the obtained filter cake to obtain the halloysite Ag-carrying antibacterial agent. The preparation method is simple and has low production cost and good loading effect; and the halloysite Ag-carrying antibacterial agent obtained by the preparation method has the advantages of good antibacterial effect, broad-spectrum antibacterial function, firm loading and good slow-releasing property of antibacterial silver ions, and good heat resistance.

Description

technical field [0001] The invention relates to an inorganic antibacterial agent and a preparation method thereof, in particular to an inorganic silver-loaded antibacterial agent and a preparation method thereof. Background technique [0002] Antimicrobial agents refer to chemical substances that are highly sensitive to some microorganisms and can be added to materials in a small amount to give materials antimicrobial properties. That is to say, antimicrobial agents are substances that can prevent microorganisms such as bacteria and fungi from developing or inhibit the growth of microorganisms. Antibacterial materials refer to a new type of functional material that can inhibit or kill bacteria on its surface by adding certain antibacterial substances (antibacterial agents). [0003] According to the different components, antimicrobial agents can generally be divided into two categories: inorganic and organic. Organic antibacterial agents include phenols, phenol ethers, quat...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N25/08A01P1/00
Inventor 韩利雄严春杰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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