This invention specifically discloses a preparation process for a low melt flow index polypropylene halogen-free flame retardant masterbatch, which includes mixing the raw materials in a high-speed mixer, then feeding them into a twin-screw extruder for melt mixing and granulation to obtain the polypropylene halogen-free flame retardant masterbatch. The raw material components, in parts by weight, include 27-34 parts of polypropylene, 65-70 parts of halogen-free flame retardant, 0.3-0.6 parts of antioxidant, 0.5-1 part of lubricant, and 1-1.4 parts of black masterbatch. The twin-screw extruder, along the material conveying direction, sequentially includes a feeding section, a plasticizing section, a mixing section, a venting section, and a metering section; the screw elements of the plasticizing section include mixing elements, shearing elements, forward conveying elements, mixing elements, forward conveying elements, and reverse conveying elements; the screw elements of the mixing section sequentially include forward conveying elements, reverse conveying elements, forward conveying elements, shearing elements, forward conveying elements, shearing elements, and forward conveying elements; the feeding section is sequentially provided with a main feeding port and a side feeding port, with other components fed from the main feeding port and the halogen-free flame retardant fed from the side feeding port.
Country Code: CN
Application Number: CN202311802738.5
