▎ 摘　　要

NOVELTY - Graphene-modified flame-retardant polystyrene pellet comprises 80-120 pts. wt. polystyrene, 1-3 pts. wt. graphene, 2-6 pts. wt. plasticizer, 1-3 pts. wt. antioxidants, 70-90 pts. wt. polystyrene resin, 2-5 pts. wt. flame retardant, 3-10 pts. wt. foaming agent and 1-3 pts. wt. dispersing agent. USE - Graphene-modified flame-retardant polystyrene pellet. ADVANTAGE - The graphene-modified flame-retardant polystyrene pellet has high production efficiency, is environment-friendly and saves resources. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an extrusion pelletizing method of graphene modified flame retardant polystyrene particles, which involves: (A) preparing each raw material according to proportion; (B) premixing polystyrene, graphene, antioxidant and half the amount of plasticizer by a high mixer and adding the mixed materials to a twin-screw extruder for mixing, and drying the mixed melt by underwater pelletizing to obtain graphene masterbatch, where the working temperature of each zone of the twin-screw extruder barrel heating device is controlled at 150-180 degrees C; (C) adding the prepared polystyrene resin, graphene masterbatch, flame retardant, dispersant and remaining half of the plasticizer to the twin-screw extruder, pouring the foaming agent when the material melts to a certain viscosity, mixing fully and homogenizing by the shearing action of the twin-screw extruder such that the working temperature of each zone of the twin-screw extruder barrel heating device is controlled at 150-180 degrees C, filtering the mixed melt base into a screen changer such that the temperature of the screen changer is set to 160-180 degrees C, injecting the filtered melt into the heat exchanger to equalize the temperature of the material in which the heat exchanger temperature is set to 150-170 degrees C, and injecting the melt from the heat exchanger into the melt pump for pressure regulation, and then entering the underwater pelletizing system to obtain graphene-modified flame retardant polystyrene particles; and (D) sieving the cut particles by a vibrating sieve machine, classifying the sieved particles, weighing the products of different particle sizes and packaging by a packaging machine to obtain final product.