The invention provides a special polypropylene compound and its preparation method. The steps are: Adding polypropylene powder into a high-speed mixer for low-speed stirring; sequentially adding primary antioxidant, auxiliary antioxidant and rigidity enhancer for continuous low-speed mixing; adding lubricant and friction reducer in sequence and mixing uniformly to obtain a premix; feeding the premix into a twin-screw extruder for extrusion and granulation, and removing residual odor and impurities through a vacuum pumping system to prepare the special PP material. With the combined formula of friction reducer, rigidity enhancer and basic additives in optimized proportions, the material achieves both low friction coefficient and high flexural modulus, meeting the application requirements of piston components for two-piece disposable syringes. The process is simple and easy to operate, and the low additive dosage effectively reduces production costs.
Country Code: CN
Application Number: CN202410878078.7
