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Method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-homogeneous precipitation

A technology of uniform precipitation and antibacterial powder, which is applied in the direction of botany equipment and methods, chemical instruments and methods, applications, etc., and can solve the problems of large powder particles and unsatisfactory antibacterial effect

Inactive Publication Date: 2010-08-04
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder particles are large, and the antibacterial effect is not ideal

Method used

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  • Method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-homogeneous precipitation
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  • Method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-homogeneous precipitation

Examples

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Effect test

Embodiment 1

[0026] Slowly add 10mL of sodium acetate aqueous solution with a concentration of 3.20mol / L to the stirred silver nitrate aqueous solution at a rate of 0.01mL / s, and react for 15min to 45min under ultrasonic heating at 20°C to 40°C with stirring, and then filter , fully washed with deionized water to remove nitrates. A precipitate of silver acetate was obtained.

Embodiment 2

[0028] Add 5.0 g of sodium tungstate into 50 mL of deionized water at a temperature of 20°C to 40°C, and stir to obtain an aqueous solution of sodium tungstate. Then the sodium tungstate aqueous solution is slowly added dropwise to the stirred silver acetate aqueous solution at a rate of 0.005mL / s, and reacted for 15min to 45min under ultrasonic heating at 20°C to 40°C with stirring, then filtered and fully washed with deionized water , to remove acetate. Dry to obtain silver tungstate powder.

Embodiment 3

[0030] The antibacterial powder is applied to the sanitary enamel at 1.5wt%-3.0wt% of the total weight of the dry glaze, and finally antibacterial ceramics are obtained. The antibacterial effect is tested by dipping culture method. The antibacterial rate is above 90%, and the appearance of the antibacterial ceramics is no Discoloration and distortion.

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Abstract

The invention relates to a method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-homogeneous precipitation. In the method, the ultrafine silver tungstate antibacterial powder is prepared by using relation between solubility and temperature of silver tungstate and silver acetate and adopting a homogeneous precipitation method, namely silver ions in the solution are slowly and uniformly generated by using the chemical reaction of the silver tungstate and silver acetate, and the phenomenon of uneven local concentration of the system caused by direct addition of a precipitator is avoided. In the reaction process, the method utilizes the cavitation effect of ultrasonic waves to intensify the diffusion and uniform mixing of reaction raw materials, shorten the reaction time and make granularity small and uniform. The experiment shows that the reaction temperature under the ultrasonic environment is between 20 and 40 DEG C; the reaction time is between 15 and 45 minutes; the effect is good; and finally, the ultrafine silver tungstate antibacterial powder with average particle diameter of between 2 and 3 mu m is prepared. The antibacterial powder accounting for 1.5 to 3.0 weight percent of the total weight of dried glaze is applied to sanitary enamel to prepare antibacterial ceramics; the antibacterial rate is over 90 percent; and the appearance of the antibacterial ceramics has no discoloration and distortion.

Description

Technical field: [0001] The invention relates to a powder preparation technology. A method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-uniform precipitation. Background technique: [0002] Health is one of the topics that people are most concerned about. However, bacteria are everywhere and pervasive, and their spread and spread seriously threaten human health. Using sterilizing and antibacterial materials to kill and inhibit the growth and reproduction of harmful bacteria is an important means to improve human health. With the improvement of people's living standards, people's demand for antibacterial materials and antibacterial products will continue to increase. Silver-based inorganic antibacterial powder has become one of the research hotspots in the field of antibacterial powder due to its long-term effect, no drug resistance, and especially good heat resistance. Silver tungstate is a new type of compound antibacterial powder, which ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00A01N59/00C04B41/86
Inventor 吴卫华王黔平郭治王君君崔海滨
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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