Technical Analysis of Homopolymer and Copolymer Injection Molding PP: Parameters, Production Technology, and Application Scenarios

Homopolymer injection molding PP is polymerized from single propylene monomers, featuring high molecular chain regularity and a crystallinity of 60%-70%, which endows it with excellent rigidity and heat resistance. According to the document, its Melt Flow Rate (MFR) ranges from 5-15 g/10 min (230℃/2.16kg). Typical grades include:

Homopolymer injection molding PP employs high-efficiency liquid-phase bulk polymerization or gas-phase polymerization processes, with core controls including:

Homopolymer injection molding PP is widely used in:

Copolymer injection molding PP is formed by block copolymerization of propylene and ethylene, reducing crystallinity to 40%-60% and significantly improving toughness. Typical parameters are as follows:

Copolymer injection molding PP adopts a multi-stage polymerization process: propylene homopolymerization first, followed by ethylene block copolymerization, controlling ethylene content at 5%-15% to form a "hard core-soft shell" structure and ensure uniform phase distribution.

Copolymer injection molding PP, with both rigidity and toughness, is mainly applied in:

Selection Principle: For products requiring static load-bearing or high-temperature environments (e.g., microwave utensils), prioritize homopolymer injection molding PP; for those needing dynamic impact resistance or low-temperature use (e.g., winter outdoor equipment), copolymer injection molding PP is more suitable. Both can be further optimized with fillers to meet special industrial requirements.