Method for preparing nano composite hydrogel with magnetic function

Abstract

The invention relates to a method for preparing nano composite hydrogel with magnetic function. The method comprises the following steps of: (1) adding inorganic clay into deionized water, stirring to completely strip the clay, adding a water-soluble monomer, an initiator and a catalyst, mixing uniformly to obtain a prepolymer solution, and polymerizing the obtained prepolymer solution at the temperature of between 5 and 30 DEG C for 24 to 120 hours to obtain nano composite hydrogel; and (2) dissolving a bivalent iron salt and a trivalent iron salt into deionized water, adding 1 to 10 grams of the nano composite hydrogel, soaking for 24 to 120 hours at the temperature of between 5 and 30 DEG C under the protection of nitrogen to obtain soaked hydrogel, preparing 0.5 to 5mol / L co-precipitator, adding the soaked hydrogel, reacting for 1 to 12 hours under the protection of nitrogen, and thus obtaining the nano composite hydrogel with magnetic function. The preparing method is simple, wide in raw material source and low in cost; and the obtained nano composite hydrogel has excellent magnetic performance and high application value.

Description

technical field

[0001] The invention belongs to the field of preparation of nanocomposite hydrogel, in particular to a preparation method of nanocomposite hydrogel with magnetic function. Background technique

[0002] Polymer hydrogel is a multi-component system composed of three-dimensional polymer network and solvent water. After absorbing a large amount of water, it can cause macroscopic changes in the polymer network. Hydrogels have the properties of a solid that cannot flow macroscopically, and have a solution-like behavior microscopically, which can swell in water but not dissolve. Although the water in the hydrogel is bound in the gel network, it still has certain mobility, which is similar to the structure of living organisms and has good biocompatibility. The organic / inorganic nanocomposite hydrogel introduces nanoscale inorganic clay as physical cross-linking points in the three-dimensional network, and forms a three-dimensional network structure through the non-c...