Propylene copolymer, preparation method therefor, and application thereof

A method for preparing a propylene copolymer, comprising:

• S1. adding a first reactant mixture comprising a Ziegler-Natta catalyst, a cocatalyst, propylene, and a furan substituted olefin monomer in a reaction vessel to carry out a first polymerization reaction, wherein the first reactant mixture contains no ethylene;
• S2. mixing a second reactant mixture comprising ethylene, propylene, and the furan substituted olefin monomer with a product of the first polymerization reaction with in the reaction vessel to carry out a second polymerization reaction;
• and
• S3. mixing a product of the second polymerization reaction with a coupling agent to obtain a premixed raw material, extruding the premixed raw material using an extruder for melt extrusion to obtain the propylene copolymer,
• wherein the propylene copolymer contains propylene in a mass content of 49% to 95%, ethylene in a mass content of 3% to 49%, the furan substituted olefin monomer in a mass content of 1% to 30%, and the coupling agent in a mass content of 0.1% to 30%.