The invention relates to the technical field of functional
coating materials, and discloses antibacterial and waterproof leather and a preparation method thereof.The antibacterial and waterproof leather comprises a leather base material and a
surface coating, and the
surface coating comprises 5-15% of waterproof and antibacterial monomers and 40-60% of
polytetrahydrofuran glycol derivative polymers; 20 to 35 percent of an
isophorone diisocyanate cross-linked product; 3 to 8% of a 2, 5-anhydro-1-azido-1-deoxy-D-glucitol modifier, and the balance of a
solvent; the waterproof antibacterial
monomer is formed by
grafting 2-guanidino
benzimidazole and trifluoroepoxypropane through a terminal carboxyl group intermediate; the
surface coating is of a gradient structure and comprises a bottom layer, a middle layer and a
surface layer. The three-step gradient structure of the bottom layer, the middle layer and the
surface layer is constructed, so that collaborative optimization of air permeability,
mechanical strength and super-hydrophobicity is realized. The bottom layer with low
solid content forms a porous buffer layer, the middle layer provides mechanical support, and the
surface layer with high
solid content constructs a compact protective network. Antibacterial groups are directionally distributed on an
interface layer, and hydrophobic chain segments are enriched on the surface, so that the
antibacterial property, the waterproof property and the flexibility are efficiently unified.