Antiviral formulation, antiviral filtering material, methods of preparation thereof and antiviral face mask

30:

• The antiviral formulation as recited in claim 29 wherein the metallic copper particles and the graphene oxide or the reduced graphene oxide are chemically bonded.

31:

• The antiviral formulation as recited in claim 29 wherein the bonding matrix material includes a water-based resin.

32:

• The antiviral formulation as recited in claim 31 wherein the water-based resin is a polyurethane resin, an acrylic resin, a polyester resin, oligomers or mixtures thereof.

33:

• The antiviral formulation as recited in claim 32 wherein the water-based resin is polyurethane resin or acrylic resin, wherein the ratio between graphene oxide or reduced graphene oxide, and metallic copper particles is between 62:1 to 1:1, and wherein the ratio between graphene oxide or reduced graphene oxide and copper suspension, and the resin is between 1:1 and 600:1.

34:

• The antiviral formulation as recited in claim 32 wherein further comprising a functionalized nanosilica component.

35:

• The antiviral formulation as recited in claim 29 wherein the bonding matrix material includes an alkaline hydrolyzed epoxy silane.

36:

• The antiviral formulation as recited in claim 35 wherein the copper particles are encapsulated.

38:

• The antiviral filtering material as recited in claim 37 wherein the bonding matrix further includes a functionalized nanosilica component.

39:

• The antiviral filtering material as recited in claim 37 wherein the bonding matrix includes a water-based resin.

40:

• The antiviral filtering material as recited in claim 39 wherein the water-based resin is a polyurethane resin, an acrylic resin, a polyester resin, oligomers or mixtures thereof.

41:

• The antiviral filtering material as recited in claim 40 wherein the water-based resin is polyurethane resin or acrylic resin, wherein the ratio between graphene oxide or reduced graphene oxide, and metallic copper particles is between 62:1 to 1:1, and wherein the ratio between graphene oxide or reduced graphene oxide and copper suspension and the resin is between 1:1 and 1500:1.

42:

• The antiviral filtering material as recited in claim 40 wherein the bonding matrix includes a functionalized nanosilica network into which both graphene oxide and metallic copper particles are chemically bonded.

43:

• The antiviral filtering material as recited in claim 37 wherein the textile includes natural fibers, synthetic fibers or a mixture thereof.

46:

• The method as recited in claim 44 wherein the bonding matrix material includes polyurethane resin, acrylic resin, polyester resin, oligomers or a mixture thereof.

47:

• The method as recited in claim 44 further comprising adding an aqueous dispersion of functionalized nanosilica after mixing the aqueous dispersion with the bonding matrix material.

49:

• The method as recited in claim 48 wherein the epoxy silane is 3-glycidoxypropyltrimethoxysilane.

50:

• The method as recited in claim 48 wherein the encapsulation of the copper particles is operated with glycerin, polyvinyl acetate, or lignin.

51:

• The method as recited in claim 48 further comprising adding a water-based resin after adding graphene oxide or reduced graphene oxide.

53:

• The method as recited in claim 52 wherein the step of coating the textile with the antiviral formulation is a dip coating, screen printing, spray coating or roller coating.

54:

• The method as recited in claim 52 wherein the curing of the coated textile is operated at a temperature comprised between 70 and 230° C. during 1 to 13 minutes.

55:

• An antiviral face mask made from an antiviral filtering material comprising a layer of textile coated with an antiviral formulation comprising metallic copper particles in an unoxidized form and having a median particle diameter inferior or equal to 200 nm, and graphene oxide or reduced graphene oxide, and a bonding matrix into which both metallic copper particles and graphene oxide or reduced graphene oxide are anchored.

56:

• The antiviral face mask as recited in claim 55 wherein the antiviral formulation further comprises a functionalized nanosilica component.