Preparation method for silver-containing titanium dioxide antibacterial agent

A technology of titanium dioxide and antibacterial agent, which is applied in the field of preparation of silver-containing titanium dioxide antibacterial agent, can solve the problems of limited usage, low antibacterial efficiency, and high price, and achieve the effect of improving stability and long-term antibacterial activity

Inactive Publication Date: 2018-11-30
徐涌涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Inorganic antibacterial agents are divided into two categories: oxide semiconductor light-activated antibacterial represented by titanium dioxide and heavy metal sterilized represented by silver. Titanium dioxide has a wide range of sources and low cost, but its antibacterial efficiency is low; while heavy metals such as silver have good antibacterial effects. But expensive and usage is limited

Method used

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preparation example Construction

[0018] The invention discloses a preparation method of silver-containing titanium dioxide antibacterial agent, comprising:

[0019] (1) Add butyl titanate to absolute ethanol and keep stirring until the addition is complete, then add dilute nitric acid dropwise, and magnetically stir for 20 to 30 minutes in a water bath at 30 to 60°C to obtain a titanium dioxide sol. The volume ratio of butyl ester, the dehydrated alcohol and the dilute nitric acid is 5:10~20:0.5~1.5;

[0020] (2) Add silver nitrate solution to the above titanium dioxide sol, stir for 10 to 20 minutes, add dropwise 3% ammonia water until the precipitate just disappears, then add formaldehyde solution, and magnetically stir for 2 to 3 hours in a water bath at 50 to 60°C to obtain Silver-titanium dioxide sol mixture;

[0021] (3) Centrifuge the above silver-titanium dioxide sol mixture, wash the obtained precipitate with ethanol aqueous solution for 3 to 5 times, and dry in an oven at 50 to 60°C for 10 to 20 ho...

Embodiment 1

[0027] (1) Add butyl titanate to absolute ethanol and keep stirring until the addition is complete, then add dilute nitric acid dropwise, and stir magnetically for 20 minutes in a water bath at 30°C to obtain a titanium dioxide sol, the butyl titanate, the The volume ratio of said dehydrated alcohol, said dilute nitric acid is 5:10:0.5;

[0028] (2) Add 0.01mol / L silver nitrate solution to the above titanium dioxide sol, stir for 10min, add 3% ammonia water dropwise until the precipitate just disappears, then add 0.1mol / L formaldehyde solution, and magnetically Stir for 2h to obtain a silver-titanium dioxide sol mixture;

[0029] (3) The above-mentioned silver-titanium dioxide sol mixture is centrifuged, and the obtained precipitate is washed 3 to 5 times with an aqueous ethanol solution, and dried in an oven at 50° C. for 10 hours to obtain a silver-containing titanium dioxide antibacterial agent.

Embodiment 2

[0031] (1) Add butyl titanate to absolute ethanol and keep stirring until the addition is complete, then add dilute nitric acid dropwise, and stir magnetically for 25 minutes in a water bath at 50°C to obtain a titanium dioxide sol, the butyl titanate, the The volume ratio of said dehydrated alcohol, said dilute nitric acid is 5:15:1;

[0032] (2) Add 0.03mol / L silver nitrate solution to the above titanium dioxide sol, stir for 15min, add dropwise 3% ammonia water until the precipitate just disappears, then add 0.6mol / L formaldehyde solution, and magnetically Stir for 2.5h to obtain a silver-titanium dioxide sol mixture;

[0033] (3) The above silver-titanium dioxide sol mixture is centrifuged, and the obtained precipitate is washed 3 to 5 times with an aqueous ethanol solution, and dried in an oven at 55° C. for 15 hours to obtain a silver-containing titanium dioxide antibacterial agent.

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Abstract

The invention discloses a preparation method for silver-containing titanium dioxide antibacterial agent. The preparation method comprises the following steps: (1) adding butyl titanate into absolute ethyl alcohol, continuously stirring until the absolute ethyl alcohol finishes being dripped, dripping dilute nitric acid, stirring by magnetic force for 20-30min under a water bath condition of 30-60DEG C to obtain titanium dioxide sol, wherein the volume ratio of butyl titanate, absolute ethyl alcohol to dilute nitric acid is 5:(10-20):(0.5-1.5); (2) adding silver nitrate solution into the titanium dioxide sol, stirring for 10-20min, dripping 3% ammonium hydroxide until sediments just disappear, then, adding formaldehyde solution, carrying out magnetic stirring for 2-3h under a water bath condition of 50-60DEG C to obtain silver-titanium dioxide sol mixture; (3) carrying out centrifugation on the above silver-titanium dioxide sol mixture, cleaning the sediments with ethanol aqueous solution for 3-5 times, and drying in a drying oven at the temperature of 50-60DEG C for 10-20h to obtain the silver-containing titanium dioxide antibacterial agent. In the silver-containing titanium dioxide antibacterial agent, titanium dioxide can favorably load and fix silver nanoparticles, and the silver nanoparticle has long-acting antibacterial activity.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of a silver-containing titanium dioxide antibacterial agent. Background technique [0002] Antibacterial agents, as a class of preparations whose main function is to kill and inhibit the growth of microorganisms, are mainly divided into two types: organic antibacterial agents and inorganic antibacterial agents. Among them, organic antibacterial agents have the characteristics of low cost and strong pertinence, but have problems such as poor broad-spectrum and poor heat resistance. Inorganic antibacterial agents have the advantages of long-acting and broad-spectrum, and are currently one of the research hotspots in this field. [0003] Inorganic antibacterial agents are divided into two categories: oxide semiconductor light-activated antibacterial represented by titanium dioxide and heavy metal sterilized represented by silver. Titanium dioxide has a wide r...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01P3/00A01P1/00
CPCA01N59/16
Inventor 徐涌涛唐丽华陆磊
Owner 徐涌涛
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