A kind of silver-loaded expanded graphite prepared from extra large flake graphite and its preparation and application

Abstract

The invention discloses silver-loaded expanded graphite prepared by extra-large flaky graphite and preparation and application thereof. The expanded graphite is loaded with silver nanoparticles, and is prepared by the extra-large flaky graphite. Specific methods comprise an impregnating reducing method, a coating method and a spraying method; the impregnating reducing method adopts a non-toxic reducing agent to simultaneously reduce oxygen-containing functional groups and silver ions of the graphite; the coating method refers to coat a layer of silver nitrate solution onto the expanded graphite; the spraying method refers to spray the silver nitrate solution in a mist state onto the expanded graphite. The silver-loaded expanded graphite prepared by the extra-large flaky graphite through the several methods has the advantages that the bacteria sterilizing and inhibiting properties are excellent, the methods are simple, the operation is easy, the cost is low, and the methods are suitable for being popularized and applied; the silver-loaded expanded graphite prepared by the extra-large flaky graphite is used for wound dressings, the sticking with wounds is avoided in the use process, the pain is relieved, and the healing of the wounds is promoted; the bacteria sterilizing and inhibiting properties are excellent, and the infection of the wounds by bacteria is avoided.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a silver-loaded expanded graphite prepared from extra-large flake graphite and its preparation and application. Background technique [0002] Traditional dressings such as gauze and cotton pads are commonly used clinically. Such dressings cannot keep the wound moist and delay wound healing; they have poor biocompatibility, and the fibers of the dressing are easy to fall off, causing foreign body reactions on the wound; It grows into the mesh of the gauze and causes pain when changing the dressing; it does not have bactericidal properties, and pathogens can easily pass through the infiltrating dressing to cause wound infection; the workload of dressing changing is heavy, but the effect on promoting wound healing is not significant. The congenital defects of these traditional dressings have prompted the development of new wound dressings to replace traditional dressin...

AI Technical Summary

Problems solved by technology

Patent CN951155437.0 uses ordinary large flake graphite (particle size ≤ 0.5mm) to prepare the dressing. Due to the small particle size, when the flake dressing is used, the expanded graphite particles are easy to fall off, which affects the use effect