▎ 摘　　要

NOVELTY - Method for manufacturing a removable, waterproof multi-layer coating includes (a) preparing at least one polymer solution based on a first sprayable polymer to be used in the form of a continuous film as a coating on the surface to be treated, serving a first function of "host layer", (b) preparing the nanoparticles to be sprayed on the film, by thermally expanding the interdispersed graphene then sonicated in acetone, and then sonicating the zinc oxide nanorods in acetone to obtain nanostructures based on graphene and zinc oxide, (c) spraying the polymer solution obtained in step (a) on the surface to be treated to form a continuous film adhered to the same surface acting as a "host layer", and (d) depositing the nanostructures, or graphene decorated with zinc oxide nanorods, obtained in step (b) on the host layer, to form an barrier on the surface, and (e) using a second polymer solution in place of or in combined action with the first polymer forming the "host layer". USE - The method is used for manufacturing a removable, waterproof multi-layer coating having antibacterial and anti-coronavirus (COVID) properties for contact surfaces made of metal, fabric, or plastic (all claimed). The coating is used for applying to three different surfaces such as metal, plastic and fabric, and used in particular hospitals for nosocomial surface disinfestation applications. ADVANTAGE - The coating deposited by spraying, has high resistance to moisture, uses graphene as an antibacterial and anti-COVID agent, high antibacterial properties, high adhesion to the surface to be coated, uses PVP to ensure high adhesion between the metal and the main "host" polymer (PCL), uses during the production method, of ecological solvents, such as ethanol and acetone, is easy to produce and easy to apply by spraying, provides rapid production method, low-temperature production, rapid and easy removal with ethanol or acetone or by rubbing with plenty of water, is low-cost, and is not toxic to humans. The caoting allows distributing an antibacterial/anti-COVID agent to a material or fabric, in order to obtain antimicrobial and anti-COVID surfaces which reduce the contact and diffusion of pathogen microorganisms. DETAILED DESCRIPTION - Method for manufacturing a removable, waterproof multi-layer coating having antibacterial and anti-coronavirus (COVID) properties which uses, as an antibacterial and anti-COVID agent, graphene nanoparticles and zinc oxide nanorods or graphene nanoparticles decorated with zinc oxide nanorods, characterized in that it is applicable by spraying on different contact surfaces, made of metal, fabric, or plastic, the method including (a) preparing at least one polymer solution based on a first sprayable polymer to be used in the form of a continuous film as a coating on the surface to be treated, serving a first function of "host layer" to promote the optimal dispersion and surface distribution of the graphene nanoparticles and zinc oxide nanorods or graphene nanoparticles decorated with zinc oxide nanorods which, when sprayed on the coating as an antibacterial and anti-COVID agent, remain partially exposed above the free surface thereof, and a second function of ensuring adhesion to the surface to be coated, and promoting the formation of the continuous film on the surface to be coated, (b) preparing the nanoparticles to be sprayed on the film, by thermally expanding the interdispersed graphene then sonicated for 20 minutes in acetone, by unit of a probe sonicator and then sonicating the zinc oxide nanorods in acetone for 3 minutes, by unit of an ultrasonic bath thus obtaining nanostructures based on graphene and zinc oxide, (c) spraying the polymer solution obtained in step (a) on the surface to be treated to form a continuous film adhered to the same surface acting as a "host layer", and (d) superficially depositing, again by spraying, the nanostructures based on graphene and zinc oxide, or graphene decorated with zinc oxide nanorods, obtained in step (b) on the host layer, to form an antibacterial and anti-COVID barrier on the surface, by virtue of the sharp edges of the nanostructures which, protruding externally, interact directly on the cell membranes, and (e) possibly using a second polymer solution based on a second polymer, in place of or in combined action with the first polymer forming the "host layer", so that the creation of the nanoparticle barrier, the adhesion to the surface to be coated, and the creation of a continuous film are simultaneously ensured, where the polymer forming the "host layer" is selected from Polyvinylpyrrolidone (PVP), or polymer 2, which has excellent adhesion to metal surfaces, and Polycaprolactone (PCL), or polymer 1, which is a semi-crystalline polymer with a low melting point of 60 degrees C and a glass transition temperature of -60 degrees C, which has excellent adhesion to polymer resin and fabric surfaces, and a poor solubility in water. INDEPENDENT CLAIMS are included for the following: (1) a removable, waterproof multi-layer coating with antibacterial and anti-COVID properties, characterized in that it consists of at least one polymer film acting as a "host layer" on which graphene nanoparticles and zinc oxide nanorods are sprayed as an antibacterial agent, which remain partially exposed above the free surface, the polymer film being either directly adhered by spraying to the surface to be coated or possibly adhered by spraying to a second polymer film, in turn adhered by spraying to the surface to be coated, and used as an element to promote the adhesion to the surface to be coated of the first polymer film forming the antibacterial and anti-COVID coating, the polymer material used to create the coating consisting of Polycaprolactone (PCL) used individually on fabric or resin surfaces and acts as a binder for nanoparticles, and which is used in combination with a film made of Polyvinylpyrrolidone (PVP), on metal surfaces, where the Polyvinylpyrrolidone (PVP) acts as a coating and as a support for the Polycaprolactone (PCL) and the latter acts as a binder for the nanoparticles; and (2) a kit for manufacturing a removable, waterproof multi-layer antimicrobial coating for contact surfaces in environments to be sanitized, comprising a dispenser containing a first sprayable polymer solution based on PCL, to be used individually on fabric or resin surfaces and which acts as a coating and as a binder for the nanostructures, a dispenser containing active sprayable suspensions of nanostructures, a dispenser containing a second sprayable polymer solution based on PVP for metal surfaces which acts as a coating and as a support to the first polymer solution based on PCL which acts as a binder for the nanoparticles.