Polypropylene (PP) is one of the five general-purpose resins. It is a low-cost thermoplastic with high transparency, high gloss, and good tensile strength. Its appearance is white granules, tasteless and non-toxic. Due to its regular crystal structure, polypropylene granules has the advantages of easy processing, impact strength, flex resistance and good electrical insulation. So PP resin is widely used in the automotive industry, household appliances, electronics, packaging and building materials and furniture etc.
Classification of Polypropylene Resin
Polypropylene resin can be classified into various categories. According to the different spatial positions of methyl groups (-CH3) in the polypropylene molecule, it can be divided into three categories: isotactic, syndiotactic and atactic. According to the polymerization process, the polymerization of isotactic polypropylene can be divided into slurry method, bulk method, solution method and gas phase method. According to the use of PP granules, it can be divided into flat yarn (narrow tape), fiber, film, extrusion, blow molding, injection molding, etc.
