▎ 摘　　要

NOVELTY - Preparing polypropylene (PP) hollow board involves preparing raw materials include PP matrix resin, rosin resin, coupling agent, graphene oxide, modified calcium carbonate, PP reinforced masterbatch, recyclate filler and plasticizer, adding raw materials to a high-speed mixer according to a certain mass percentage to mix and mixing to obtain a mixture at 600-800 revolution/minute, using suction machine to suck the mixture into the extruder for feeding, adjusting die in the extruder and set the screw speed in the extruder to 400-550 revolution/minute, and extruding the plastic hollow board blank through the extruder at pressure 95-110 megapascals (MPa). The obtained plastic hollow board blank enters the cooling table for cooling treatment at 35-45 degrees C for 3-6 minutes. The cooled plastic hollow slab is drawn between the rubber rollers of the traction machine. USE - Method for preparing polypropylene hollow board. ADVANTAGE - The method effectively reduces cost of the filler in the raw material of the hollow board, enhances the strength of the PP hollow board, effectively improves strength of the PP hollow board by adding a small amount of nano silicon nitride modified by the coupling agent as the strength regulator, has high-strength PP hollow boards, and effectively utilizes discarded refractory materials, which is beneficial to saving resources. DETAILED DESCRIPTION - Preparing polypropylene (PP) hollow board involves preparing raw materials include PP matrix resin, rosin resin, coupling agent, graphene oxide, modified calcium carbonate, PP reinforced masterbatch, recyclate filler and plasticizer, adding raw materials to a high-speed mixer according to a certain mass percentage to mix and mixing to obtain a mixture at 600-800 revolution/minute, using suction machine to suck the mixture into the extruder for feeding, adjusting die in the extruder and set the screw speed in the extruder to 400-550 revolution/minute, and extruding the plastic hollow board blank through the extruder at pressure 95-110 megapascals (MPa). The obtained plastic hollow board blank enters the cooling table for cooling treatment at 35-45 degrees C for 3-6 minutes. The cooled plastic hollow slab is drawn between the rubber rollers of the traction machine. The hauled plastic hollow board blank enters the automatic shearing machine for cutting to obtain the plastic hollow board of the required size, and cut plastic hollow boards are inspected, and packed the qualified hollow plastic boards into the warehouse.