Preparation of Polypropylene Hot Melt Adhesive Modified by Noncovalent Functionalized Graphene and Its Application in Polypropylene Heat Shrinkable Tape
XU Huanhui1,2, LI Bo2,*, XIA Min3, YAO Chu4
1 Changyuan Changtong New Material Co., Ltd., Shenzhen 518107, Guangdong, China; 2 Advanced Materials Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; 3 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; 4 School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Abstract: Considering the requirement of oil and gas transmission pipelines' conditions for the adhesive properties of polypropylene (PP) hot melt adhesive at high temperature, tryptophan is used to accomplish the functionalization of PP on the surface of graphene, and then the preparation and coating of the functionalized graphene/PP hot melt adhesive are achieved by an extruder production line, to guarantee the stable installation and the long-lasting corrosion prevention of PP heat shrinkable tape on the pipelines. The results show that the indole ring of tryptophan are adsorbed on the surface of graphene through π-π stacking interaction and the amidogen react with the anhydride of the PP-maleic anhydride grafted copolymer to form the amide bond. And the interfacial compatibilization of graphene and PP are completed and the functionalization of PP on the surface of graphene are achieved. The functionalized graphene is beneficial to the crystallization process and dynamic mechanics performances. The melting point, the degree of crystallinity, the storage modulus at 110 ℃ of the hot melt adhesive increased by 1.1 ℃, 10.41%, 43.45%, respectively. After preparing by extrusion process, the functionalized graphene effectively improves the mechanical properties and the adhesive properties at high temperature of the PP hot melt adhesive. The shear strength at 110 ℃ reaches up to 1.42 MPa and the brittleness temperature reduces to -23 ℃. And the peel strength at 23 ℃ and 110 ℃ are 148 N/cm and 53 N/cm, achieving 370% and 265% of the standard ISO 21809-3, respectively.
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2026, Vol. 40 
