Magnetic hydrogel material with both bactericidal property and thermoresponsive contractility, preparation method and application thereof

A magnetic hydrogel material with both bactericidal property and thermoresponsive contractility, comprising:

• taking a poly(N-isopropylacrylamide) (PNIPAm) copolymerized polyacrylamide (PAm) double-network hydrogel as a matrix, grafting nano clay on the matrix to form a copolymer double-network hydrogel with thermoresponsive contractility, and doping a magnetic substance and tannic acid in the copolymer double-network hydrogel with thermoresponsive contractility to obtain the magnetic hydrogel material;
• wherein the magnetic substance is triiron tetroxide (Fe3O4);
• wherein the PNIPAm copolymerized PAm double-network hydrogel is formed through a radical polymerization reaction of N-isopropylacrylamide and acrylamide;
• wherein preparation of the magnetic hydrogel material comprises the following steps:
• dissolving the N-isopropylacrylamide, a catalyst, the acrylamide, a crosslinking agent, the nano clay, the magnetic substance, and the tannic acid in water to prepare a homogeneous precursor solution;
• wherein mass concentrations of the N-isopropylacrylamide, the catalyst, the acrylamide, the crosslinking agent, the nano clay, the magnetic substance, and the tannic acid in the homogeneous precursor solution are 8%-12%, 0.2%-0.5%, 1%-3%, 0.1%-0.5%, 3%, 15%, and 1%, respectively;
• the catalyst is sodium pyrophosphate, and the crosslinking agent is N,N′-methylenebisacrylamide (MBA);
• and
• adding an initiator and an accelerator to the homogeneous precursor solution in a protective gas atmosphere, followed by mixing evenly and polymerizing for 12 hours (h) to 16 h at 4 Celsius degrees (° C.) to 7° C. to obtain the magnetic hydrogel material;
• wherein the initiator is tetramethylethylenediamine (TMEDA), and the accelerator is an ammonium persulfate solution with a mass concentration in a range of 28% to 32%.