Bacterial cellulose-polyurethane composite material, preparation method therefor, and application thereof

A method for producing a bacterial cellulose-polyurethane composite material, comprising:

• subjecting bacterial cellulose microfibrils to an organic solvent exchange treatment to obtain a complex A and a complex B having different concentrations of bacterial cellulose microfibrils;
• wherein the complex A includes 30-50 wt % of fully dehydrated bacterial cellulose microfibrils and a balance of organic solvent based on 100 wt % of the complex A;
• the complex B includes 15-30 wt % of partially dehydrated bacterial cellulose microfibrils and a balance of organic solvent based on 100 wt % of the complex B;
• and wherein the partially dehydrated bacterial cellulose microfibrils contain 5-10 wt % of water;
• mixing the complex A and the complex B in a volume ratio of 1:2-5, and adding a polymeric polyol and a diisocyanate compound under the condition of an oil bath for polyaddition reaction, to obtain a bacterial cellulose-polyurethane foam composite prepolymer;
• and
• curing the prepolymer to obtain the bacterial cellulose-polyurethane composite material;
• wherein the weight ratio of the polymeric polyol to the diisocyanate compound is 1:0.1-0.2;
• and the polymeric polyol accounts for 20%-60% of the total weight of the complex A and the complex B.