英文回答：
Wet Process of Polypropylene for Lithium-Ion Batteries.
Introduction.
Polypropylene (PP) is a versatile thermoplastic polymer widely used in various industries, including the manufacturing of lithium-ion batteries. The wet process is a method of producing PP that involves suspension polymerization in a liquid medium. This process offers several advantages, such as high purity, narrow molecular weight distribution, and improved mechanical properties.
Process Overview.
The wet process of PP production typically involves the following steps:
1. Polymerization: Propylene monomer is added to a liquid medium, usually a hydrocarbon
solvent, along with a catalyst system. The catalyst activates the monomer, leading to polymerization and the formation of PP chains.
2. Separation: The polymer solution is separated from the unreacted monomer and solvent through filtration or centrifugation.
3. Drying: The separated PP is dried to remove any residual solvent.
4. Extrusion and Pellet Formation: The dried PP is extruded into pellets for further processing.
Advantages of Wet Process.
The wet process offers several advantages over other PP production methods, including:
High Purity: The liquid medium acts as a purification agent, removing impurities and contaminants from the polymer.
Narrow Molecular Weight Distribution: The controlled polymerization conditions in the liq
uid medium result in a narrow molecular weight distribution, which is crucial for battery applications.
Improved Mechanical Properties: The wet process can produce PP with enhanced mechanical properties, such as tensile strength, impact strength, and toughness.
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