▎ 摘　　要

NOVELTY - High-strength self-repairing protective film comprises 40-60 pts. wt. polyether polyol, 30-35 pts. wt. diisocyanate, 3-5 pts. wt. alkylphenol disulfide, 1-1.5 pts. wt. silane blocking agent, 2-4 pts. wt. aromatic diamine chain extender, 0.1-0.2 pts. wt. organic tin catalyst, 5-10 pts. wt. hydrophobic modified graphene quantum dots and 60-80 pts. wt. solvent. USE - High-strength self-repairing protective film for mobile phone. ADVANTAGE - The high-strength self-healing protective film has excellent mechanical properties, tensile strength ≥ 9 MPa, elongation at break ≥ 350 %, hardness 4 H, water contact angle ≥ 118°, good hydrophobicity and self-healing properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing high-strength self-repairing protective film, which involves: adding diisocyanate into a solvent, heating at 50-60℃, uniformly stirring, adding polyether polyol and an organic tin catalyst, heating to 70-80 ℃, and stirring to react to generate a first prepolymer; cooling at 0-5℃, adding alkylphenol disulfide and a silane end-capping agent, uniformly stirring, heating at 70-80℃, and reacting to generate a second prepolymer; adding an aromatic diamine chain extender and the hydrophobic modified graphene quantum dots, uniformly stirring, casting to form a film, and heating and curing.