Method for preparing antibacterial composite material with nano silver particles evenly dispersed in polymeric matrix

Abstract

The invention discloses a method for preparing an antibacterial composite material with nano-silver particles evenly dispersed in a polymeric matrix, which belongs to technique for preparing antibacterial nano composite materials and comprises the following steps: preparing styrene / methyl methacrylate hybrid monomers, a sodium dodecyl sulfate hybrid monomer solution, a silver nitrate aqueous solution and a trisodium citrate aqueous solution; mixing the silver nitrate aqueous solution and the trisodium citrate aqueous solution with the sodium dodecyl sulfate hybrid monomer solution according to a volume ratio to obtain a micro-emulsion containing silver nitrate and a micro-emulsion containing trisodium citrate; stirring and mixing the two micro-emulsions to obtain a stable micro-emulsion having hybrid monomers of continuous phases and containing the nano-silver particles; and then dispersing the emulsions in distilled water to prepare a common emulsion, introducing nitrogen for deoxidization, adding an initiator to perform emulsion polymerization reaction, using sodium chloride to perform emulsion-breaking and separation on the product, fully washing the product with deionized water, and soaking the product in ethanol, and drying the product to constant weight so as to obtain the antimicrobial nano-silver / poly(styrene-methyl methacrylate) composite material. The method has simple preparation processes and can make the nano-silver particles evenly dispersed in the polymer matrix, and the prepared composite material has broad-spectrum bactericidal property, and has high fatality rate to Escherichia coli, bacillus subtilis, staphylococcus aureus and pseudomonas aeruginosa in 24 hours.

Description

technical field [0001] The invention belongs to the technical field of preparation of antibacterial nano composite materials, in particular to a preparation method of nano silver / poly(styrene-methyl methacrylate) composite materials in which antibacterial nano silver particles are uniformly dispersed in a polymer matrix. Background technique [0002] Silver ions and nano-silver particles, as inorganic antibacterial agents, have a good inhibitory effect on fungi and bacteria, and have many advantages such as high efficiency, long-lasting and broad-spectrum, but their chemical properties are active, and they are easily transformed into brown silver oxide, which affects the antibacterial performance. Combining nano-silver particles with polymers can prepare antibacterial polymer materials, which can not only retain the main properties of silver particles and polymer matrix, but also obtain functions that the original components do not have through the composite effect. [0003...

AI Technical Summary

Problems solved by technology

[0007] The shortcomings of the above technologies are: (1) the preparation process is more complicated; (2) the extremely strong agglomeration of nano-silver particles leads to the fact that the silver particles cannot be evenly dispersed in the polymer with nanometer size

[0008] Regarding the preparation of a microemulsion containing nano-silver particles by polymerizing monomers (styrene / methyl methacrylate) as the continuous phase, and then performing emulsion polymerization to prepare antibacterial nano-silver particles uniformly dispersed in the polymer matrix, nano-silver / Poly(styrene-methyl methacrylate) composites have not been reported yet