Persistent lubricating coating on surface of medical catheter and preparation method thereof

The invention discloses a presistent lubricating coating on the surface of a medical catheter. The lubricating coating of the medical catheter is formed by interpenetrating a dynamic physical bond bonded polymer network and a covalent bond cross-linked network layer. A polymer network bonded by dynamic physical bonds is formed by utilizing electrostatic adsorption and interaction of dynamic physical bonds such as hydrogen bonds, the polymer network is impregnated into a monomer solution, monomer molecules are uniformly diffused and distributed inside the polymer network, and then monomers are initiated to polymerize by ultraviolet light irradiation to form a covalent cross-linked network structure. The covalent cross-linked network and the porous network bonded by the dynamic physical bonds are mutually penetrated to form an interpenetrating network lubricating layer. In order to overcome defects in the prior art, the invention provides the presistent lubricating coating on the surface of the medical catheter