A preparing method of long-chain branched polypropylene

• Main Authors: ZHAI WENTAO, WU FEI, WANG KUN, PANG YONGYAN, ZHENG WENGE
• Format: Patent
• Language: Chinese; English
• Published: 19.10.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOSITIONS BASED THEREON; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A preparing method of long-chain branched polypropylene is provided. The method includes a) weighing 100 parts by weight of polypropylene, 0.01-0.4 part by weight of an initiator, 0.1-0.3 part by weight of an antioxidant, and 1-10 parts by weight of an acrylate monomer with multiple functional groups, b) adding the initiator, the antioxidant and the acrylate monomer with multiple functional groups into an organic solvent, premixing to obtain a premix solution, and mixing the premix solution with the polypropylene to obtain a mixture, and c) adding the mixture into an extruder, feeding supercritical carbon dioxide from a 1/5-1/3 point of a screw of the extruder, melting, and extruding to obtain the long-chain branched polypropylene. Through feeding the supercritical carbon dioxide into the screw, the actual reaction temperature is greatly reduced, and the branching capability of the acrylate monomer with the multiple functional groups is greatly improved, thus significantly improving the polypropylene melt str