Preparation method of anti-yellowing high-transparency self-repairing TPU composition film

The invention discloses a preparation method of an anti-yellowing high-transparency self-repairing TPU (thermoplastic polyurethane) composition film, and relates to a film preparation method, the anti-yellowing high-transparency self-repairing TPU composition film is prepared from the following components in parts by weight: 70-95 parts of polyether TPU with the hardness of 80A-95A, 1-30 parts of high-transparency LLDPE (linear low-density polyethylene), 1-5 parts of an anti-yellowing agent UV1051, 0.2-1 part of a curing agent, 1-3 parts of an antioxidant and 0.5-2 parts of a slipping agent. The preparation method comprises the following steps: fully and uniformly mixing the TPU raw material, the LLDPE, the anti-yellowing agent, the curing agent and the antioxidant through a twin-screw extruder, and casting through a casting machine to obtain the anti-yellowing high-transparency self-repairing TPU film. By adding the high-transmittance LLDPE, the yellowing-resistant agent and the UV auxiliary agent, a film pr