POLYPROPYLENE RESIN AND PREPARATION METHOD THEREFOR

• Main Authors: WANG, Fushan, LI, Guangquan, YE, Pengbo, SONG, Sainan, GAO, Yan, LIU, Qiang, HUANG, Anping, PENG, Wei, SONG, Bin, WANG, Xia
• Format: Patent
• Language: Chinese; English; French
• Published: 06.07.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Polypropylene resin and a preparation method therefor, the method comprising: propylene prepolymerization, liquid phase bulk polymerization, gas phase polymerization, polypropylene drying, purification, and extrusion granulation; according to the method, first propylene is pre-polymerized, then a pre-polymer slurry is injected into two series-connected tank reactors for liquid phase bulk polymerization and into one fluidized-bed reactor for gas phase polymerization, a polypropylene base material is washed by using a compound solvent prepared from hydrocarbon and alcohol solvents, catalyst residues and amorphous polypropylene are removed, and a low-ash long-acting anti-oxidant composite agent is used to prevent secondary pollution of the polypropylene product by impurities, thereby achieving ultra-clean polypropylene industrial production. La présente invention concerne une résine de polypropylène et son procédé de préparation, le procédé comprenant : la pré-polymérisation du propylène, la polymérisation en ma