The present invention belongs to the field of polymer materials, and provides a preparation method of a high-thickness, high-transparency TPU extrusion material. The raw materials include: isocyanate, chain extender and polyol. The preparation process comprises: adding the polyol and part of the isocyanate into a first twin-screw extruder for extrusion; feeding the discharge from the first twin-screw extruder, together with the chain extender and the remaining isocyanate, into a second twin-screw extruder for extrusion, followed by underwater pelletizing and drying to obtain the TPU extrusion material. After optimizing the product formula, the present invention produces products with better batch-to-batch viscosity stability, higher viscosity and better processing stability through process control. The products have passed market verification, can meet the processing requirements of higher-thickness products, and have high molding dimensional stability.
Country Code: CN
Application Number: CN202410127532.5
