Antibacterial and antiviral degradable mask and manufacturing method thereof

A method for preparing an antibacterial and antiviral degradable mask, wherein the antibacterial and antiviral degradable mask comprises a three layered structure, including a surface layer (1), a core layer (2) and an inner layer (3) that contacts a face from outside to inside;

• the surface layer (1) is made of an antibacterial and antiviral cellulose spunlace non-woven fabric;
• the core layer (2) is made of a polypropylene melt-blown non-woven fabric;
• the inner layer (3) is made of a polypropylene spunbond non-woven fabric or a degradable natural cotton fabric;
• the polypropylene melt-blown non-woven fabric in the core layer (2) possesses with a fiber fineness of 1 μm to 3 μm and a surface density of 20 g/m2 to 60 g/m2;
• the polypropylene spunbond non-woven fabric in the inner layer (3) possesses a fiber fineness of 20 μm to 30 μm and a surface density of 20 g/m2 to 45 g/m2 and the degradable natural cotton fabric possesses a surface density of 20 g/m2 to 45 g/m2;
• a preparation of the antibacterial and antiviral cellulose spunlace non-woven fabric of surface layer (1) includes following steps S1, mixing cyclohexyl isocyanate and organic solvent with each other in a mass ratio of 1:(5-10), and adding a homogeneous catalyst to prepare a first reaction solution;
• wherein the homogeneous catalyst is 4-dimethylaminopyridine, triethylamine, or dibutyltin dilaurate;
• immersing the cellulose spunlace non-woven fabric in the first reaction solution and heating for 0.5 hours to 24 hours for a first covalent grafting reaction, washing the cellulose spunlace non-woven fabric with ethanol and deionized water after the first covalent grafting reaction is completed, followed by drying the cellulose spunlace non-woven fabric;
• S2, mixing a polymer and dioxane organic solvent with each other in a mass ratio of 1:7 to prepare a second reaction solution;
• immersing the cellulose spunlace non-woven fabric obtained in Step S1 in the second reaction solution for 3 minutes to 10 minutes for a second reaction;
• washing the cellulose spunlace non-woven fabric obtained in Step S1 with ethanol after the second reaction is completed, followed by drying the cellulose spunlace non-woven fabric;
• then, curing front and back sides of the cellulose spunlace non-woven fabric under ultraviolet light including irradiating one side for 3 minutes to 10 minutes;
• S3, dissolving modified guanidine salt or neomycin sulfate in a solvent to prepare a third reaction solution with a concentration ranging from 0.01 mg/mL to 200 mg/mL and a pH value of pH>7;
• immersing the cellulose spunlace non-woven fabric obtained in Step S2 in the third reaction solution held at a constant temperature of 60° C. to 100° C. for 4 hours to 24 hours to achieve a second covalent grafting reaction;
• washing the cellulose spunlace non-woven fabric with ethanol and deionized water after the second covalent grafting reaction is completed, followed by drying the cellulose spunlace non-woven fabric to obtain the antibacterial and antiviral cellulose spunlace non-woven fabric;
• in Step S2, a structure of the polymer is
• where m=1-5, n=10-80;
• the polymer is synthesized by mixing and dissolving monomers TMA an BPEMA at molar ratio of 95:5 in a dioxane and placing a solution thereof into a circular bottom flask;
• at the same time adding an azobisisobutyronitrile initiator thereto to form a second solution and performing a polymerizing reaction of the second solution for 8 hours under a nitrogen protection at 80° C.;
• and washing out the polymer with hexane after the polymerizing reaction is completed then drying the polymer, wherein structural formulas of the monomers TMA and BPEMA is as follows:
• TMA:
• BPEMA: