Preparation method of chitin-modified polypropylene spunbond non-woven fabric

1. A preparation method of a chitin-modified polypropylene spunbond non-woven fabric, comprising:

adding polypropylene and modified chitin with a weight percentage range of approximately 0.2%-1.5% to a horizontal double ribbon mixer;

heating the polypropylene and the modified chitin to a temperature of approximately 40° C.-80° C.;

mixing the polypropylene and the modified chitin for approximately 20 min-40 min;

adding polyethylene glycol, polyvinylpyrrolidone and antioxidant;

heating polypropylene, the modified chitin, polyethylene glycol, polyvinylpyrrolidone and antioxidant to a temperature of approximately 180° C.-190° C.;

mixing polypropylene, the modified chitin, polyethylene glycol, polyvinylpyrrolidone and antioxidant for approximately 20 min-40 min to obtain a mixed material liquid;

pressing the mixed material liquid into a spinning box;

obtaining a fiber net by spinning, cooling the box by side blowing, and pulling; and

hot-rolling the fiber net into a fabric by a hot-rolling machine to obtain the chitin-modified polypropylene spunbond non-woven fabric.

2. The method according to claim 1 , wherein:

a hot-rolling temperature of the fiber net on the hot-rolling machine is in a range of approximately 140° C.-150° C.

3. The method according to claim 1 , wherein:

an operating pressure of pressing the mixed material liquid into the spinning box is in a range of approximately 2 MPa-5 MPa.

4. The method according to claim 1 , wherein:

the modified chitin is prepared by modifying a soluble chitin.

5. The method according to claim 4 , wherein preparation method of the modified chitin includes:

mixing the soluble chitin and a lactic acid with a pH value of approximately 3-5 to swell; stirring the mixture at approximately 15° C.-25° C. for approximately 10 min-20 min; adding modifier; performing an ultra-sonication for 5 min-10 min; increasing the temperature to approximately 30° C.-35° C.; adding glutaraldehyde and N-hydroxysuccinimide; maintaining the reaction for approximately 13 min-15 min to obtain a reaction solution; adding chloroacetic acid to the reaction solution; stirring at approximately 40° C.-80° C. for approximately 3 hours-5 hours to obtain a mixed solution; removing a supernatant; and performing a vacuum drying to obtain the modified chitin.

6. The method according to claim 5 , wherein:

a mass ratio of the soluble chitin, the modifier, glutaraldehyde, and N-hydroxysuccinimide is in a range of approximately (10-15): (1-3): (2-4): (1-2).

7. The method according to claim 5 , wherein:

the modifier includes 2-hydroxybenzimidazole, cellulose acetate butyrate, and adipic acid dihydrazide; and

a mass ratio of 2-hydroxybenzimidazole, cellulose acetate butyrate, and adipic acid dihydrazide is in a range of approximately 1:(3-5):(2-3).

8. The method according to claim 1 , wherein the chitin-modified polypropylene spunbond non-woven fabric has:

an anti-mold grade less than 1; and

an antibacterial rate greater than 99.5%.