The invention discloses a
quaternary ammonium salt cationic antibacterial and
antifouling coating layer as well as a preparation method and application thereof. The
quaternary ammonium salt cation antibacterial and
antifouling coating layer is arranged on the surface of a base material and comprises an outer-layer
polyethylene glycol structure and an inner-layer
quaternary ammonium salt cationic
polymer structure; the
polyethylene glycol structure and the quaternary ammonium salt cationic
polymer structure are combined together through a
Schiff base structure to form a
polymer brush with a
layered structure. Therefore, under the condition of normal or slight infection, the outer-layer
polyethylene glycol structure can effectively inhibit adhesion of
bacteria, and when
serious infection occurs, the
bacteria can secrete acidic substances to cause
Schiff base breakage, so that the inner-layer quaternary ammonium salt cationic polymer structure is exposed to kill the
bacteria and inhibit infection. The preparation method of the quaternary ammonium salt cationic antibacterial and
antifouling coating layer is simple and safe, the solution stability is good, and the quaternary ammonium salt cationic antibacterial and antifouling
coating layer has a long-acting antibacterial antifouling function and can be widely applied to the fields of bioengineering and
biomedicine.