Prepn of nanometer TiO2 antiseptic ceramic

An antibacterial ceramic and nanotechnology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem of high cost, and achieve the effect of low cost, easy mass production and simple process

Inactive Publication Date: 2002-08-07
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ag + A method for preparing antibacterial ceramics by mixing ceramics, but Ag + The cost of sterilization is high, and Ag + It is sterilized by dissolution, and the effect of the antibacterial agent will gradually decrease with the dissolution of the antibacterial agent, and the effect of the silver-based antibacterial agent will occur in about 24 hours

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Anatase Phase Nano TiO 2 The preparation of H 2 SO 4 Dissolve metatitanic acid to obtain titanyl sulfate; the concentration of dilute titanyl sulfate solution is 0.05~0.5mol / L; use ammonia water, (NH 4 ) 2 CO 3 Adjust the pH to 8-11 with the mixed solution of NaOH or ammonia water; wash orthotitanic acid with 3% Ba(NO3)2 to measure to no SO 4 - ;The calcining temperature is controlled at 500-800°C, and the treatment time is 1-2 hours; according to the above steps, a uniform and well-dispersed pure anatase phase of 30-80nm TiO can be obtained 2 .

[0020] The anatase phase nano-TiO prepared by the above method 2 Ball mill for 24 hours, then disperse in the soluble starch solution at a ratio of 2%, disperse by ultrasonication for 20 minutes, and then evenly spread it on the surface of the ceramic sheet, let it dry naturally, and observe that the film is bright and does not have shells. Then heat up to 820°C, keep the temperature for 30 minutes, take out...

Embodiment 2

[0021] Embodiment 2: the anatase phase nano-TiO prepared by the above-mentioned method 2 Ball mill for 48 hours, then disperse it in polyvinyl alcohol solution at a ratio of 5%, float it at high speed for 20 minutes, then spread it evenly on a small ceramic plate, let it dry naturally, observe that the film is bright and does not shell, and then Raise the temperature to 750°C, keep the temperature constant for 2 hours, take out the sample after cooling to room temperature, observe the smooth glaze surface of the sample, and carry out the antibacterial test. Same as Example 1, the bactericidal rate is 97%.

Embodiment 3

[0022] Embodiment 3: the anatase phase nano TiO prepared by the above-mentioned method 2 Ball mill for 32 hours, then disperse it in polyvinyl alcohol solution at a ratio of 8%, float it at high speed for 20 minutes, then spread it evenly on a small ceramic sheet, let it dry naturally, observe that the film is bright and does not shell, and then heat up 800°C, keep the temperature constant for 1 hour, take out the sample after cooling to room temperature, observe the smooth glaze surface of the sample, and carry out the antibacterial test. In the same example 1, the bactericidal rate is 95%.

[0023] The above-mentioned dispersion medium soluble starch can be replaced by polysaccharide, polyvinyl alcohol or polyethylene glycol, etc.; the above-mentioned dispersion medium polyvinyl alcohol can be replaced by soluble starch, polysaccharide or polyethylene glycol, etc.

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PUM

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Abstract

The nano TiO2 can be uniformly dispersed in medium, then uniformly coated on the ceramic surface, and roasted at high temp. to make TiO2 nano particles uniformly distributed on the glaze, and do not affect degree of finihsed of glaze. The TiO2 can be reacted with surface water and O2 in the air under the sunlight, and can release atomic oxygen and hydrogen-oxygen free radical to kill bacteria.

Description

technical field [0001] The present invention relates to a kind of nano TiO 2 The invention discloses a method for preparing antibacterial ceramics, which belongs to the field of fine chemicals. Background technique [0002] Nano Anatase TiO 2 Due to its small particle size (<100nm), the specific surface area is large. Has extremely high chemical activity, O in water and air 2 In the presence of light, atomic oxygen and hydroxyl radicals can be released to kill bacteria. The smaller the particle size, the larger the specific surface area and the better the bactericidal effect. The principle of titanium dioxide bactericidal action is as follows: <chemistry num="001"> <chem file="02115508_cml001.xml" / > < / chemistry> (Anatase) <chemistry num="002"> <chem file="02115508_cml002.xml" / > < / chemistry> <chemistry num="003"> <chem file="02115508_cml003.xml" / > < / chemistry> <chemistry num="004"> <chem file...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C04B41/85
Inventor 昝凌夏幽兰钟家柽黄玲罗其荣龚楚清
Owner WUHAN UNIV
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