A kind of nano-silver antibacterial material and preparation method thereof

Abstract

The invention relates to a nano-silver antibacterial material and preparation method for the same. According to the material, dialdehyde sodium alginate and casein are cross-linked in situ to form a composite material matrix with a network structure, and in a forming process of the material matrix, silver ions are reduced into silver nanoparticles in situ for uniform dispersion in the cross-linked network structure of the matrix by virtue of aldehyde groups in the dialdehyde sodium alginate, so that the antibacterial stability of the material is improved; the material is further cross-linked by virtue of calcium ions to form a network structure between the calcium ions and the dialdehyde sodium alginate, and the structure is combined with the cross-linked network structure formed between the dialdehyde sodium alginate and the casein to form a dual-network structure to reinforce the network structure between the dialdehyde sodium alginate and the casein, so that the mechanical performance of the material is improved, and the durability of the material is improved; a preparation process is environment-friendly, and the prepared material has better antibacterial effects on gram-positive bacteria and gram-negative bacteria.

Description

technical field [0001] The invention relates to the technical field of nano-silver composite materials, in particular to a nano-silver antibacterial material, and also relates to a preparation method of the nano-silver antibacterial material. Background technique [0002] With the development of science and technology and people's higher and higher requirements for healthy life, antibacterial technology and antibacterial materials have received extensive attention. As an antibacterial material, silver has a long history, but its weak bactericidal effect and wide antibacterial spectrum limit its application. Nano-silver has the advantages of broad-spectrum, long-lasting, and safety that cannot be compared with traditional silver-based antibacterial materials, and its application prospects are very broad. [0003] At present, the preparation of nano silver is mainly divided into physical method and chemical reduction method. Among them, physical methods mainly include laser ...

AI Technical Summary

Problems solved by technology

The existing technology is only limited screening of the ratio of silver particles and matrix materials within a limited range, and the composite material with better antibacterial effect and mechanical properties in the selected ratio is selected. The prepared nano-silver composite material has limited mechanical strength, and Chemical cross-linking agents such as epichlorohydrin and glutaraldehyde are often used to cross-link the prepared membrane materials, which is contrary to the "green" preparation process of nano-silver composite materials.

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