Preparation method for novel Ag-SiO2 composite material

Abstract

The invention relates to composite material preparation, and the purpose of the invention is to provide a preparation method for a novel Ag-SiO2 composite material. The preparation method includes the following steps: polystyrene microspheres are added into concentrated sulfuric acid, agitated for 2 to 8 hours, then repetitively centrifuged, washed with deionized water and then dispersed into absolute ethyl alcohol again, so that sulfonated polystyrene dispersion is obtained; aqueous silver nitrate solution is then added into the sulfonated polystyrene dispersion, agitated in the dark under the room temperature for 2 to 12 hours, centrifuged and washed, and the obtained solid product is dispersed into aqueous ethanol solution, so that silver-carrying polystyrene composite microsphere dispersion is obtained; after the pH value of the silver-carrying polystyrene composite microsphere dispersion is regulated with ammonia water, tetraethoxysilane is added into the silver-carrying polystyrene composite microsphere dispersion and agitated under the room temperature, the obtained product is washed, dried and then kept under the temperature of 550 DEG C, and thereby the Ag-SiO2 composite material is obtained. by controlling the special hollow and mesoporous structure of the SiO2 microspheres and regulating the amount of carried silver, the preparation method ensures that the silver carried on the inner walls of the SiO2 spherical shells can be slowly diffused out of the spherical shells via the mesopores of the spherical shells, consequently, the dissolution rate and dissolved concentration of silver ions can be controlled, and thereby the Ag-SiO2 composite material can effectively avoid the inevitable problems of the conventional antibacterial agent caused by the silver carried on the outer surface of the material, such as loss of active ingredients and decrease in antibacterial property.

Description

technical field [0001] The present invention relates to a kind of preparation method of composite material, especially a kind of Ag-SiO 2 Methods of preparation of composite materials. Background technique [0002] Inorganic antibacterial agents have the characteristics of strong antibacterial properties, good heat resistance, high safety, and are not easy to produce drug resistance. Their research and application have received extensive attention and developed rapidly. Metal ion antibacterial agent is an important inorganic antibacterial agent. Among the commonly used metal antibacterial ions (silver, copper, zinc), Ag + It has the strongest antibacterial performance, and has the characteristics of broad-spectrum antibacterial and high bactericidal efficiency, and it has the least harm to the human body and has a high safety factor. Research suggests that Ag + Contact reaction with bacteria, resulting in the destruction of the inherent components of the bacteria or dysfu...

AI Technical Summary

Problems solved by technology

Ag + If the ion dissolution rate is too slow, the antibacterial activity will decrease, and if the dissolution rate is too fast, it will have an adverse effect on the durability of the antibacterial agent. Therefore, controlling Ag + Ion dissolution rate is the key to the development of this type of antibacterial agent

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