and high-end products are still highly dependent on imports

polypropylene (pp) is a thermoplastic formed by the addition polymerization reaction of propylene. it has a transparent and light appearance. according to different polymerization methods, polypropylene can be divided into two categories: homopolymerized polypropylene and copolymerized polypropylene. copolymerized polypropylene is the base material for high-grade polypropylene special materials. polypropylene has good impact resistance, acid and…