Polypropylene (PP) is widely used in the automotive field, but in order to meet the performance requirements of automotive parts, a series of modifications are usually required. The following are some common modification methods:
Reinforcement modification:
Glass fiber reinforcement: By adding glass fiber, the mechanical strength, rigidity and heat resistance of PP can be significantly improved.
Mineral filling: If mineral fillers such as talcum powder and calcium carbonate are added, the rigidity and dimensional stability of the material can be improved while reducing costs.
Toughening modification:
Rubber toughening: By adding elastomers (such as EPDM, EPR, SEBS, etc.), the toughness and impact resistance of PP can be improved.
Blending modification: Blending with other polymers (such as polyethylene, polyamide, etc.) can improve the toughness and other properties of PP.
Flame retardant modification:
Adding flame retardants: In order to meet the fire protection requirements of automotive interior parts, halogen, phosphorus or inorganic flame retardants can be added.
Anti-aging modification:
Antioxidant: Adding antioxidants can improve the heat aging resistance of PP.
Light stabilizer: Adding UV absorbers or light stabilizers can improve the light aging resistance of PP.
Weathering modification:
Adding weathering agents: such as UV absorbers, light stabilizers, etc., can improve the weather resistance of PP when used outdoors.
Surface modification:
Coating treatment: By applying a coating, the surface properties of PP, such as wear resistance, scratch resistance and aesthetics, can be improved.
Plasma treatment: By plasma treatment, the adhesion of the PP surface can be improved, which is convenient for subsequent coating or bonding.
Conductive modification:
Adding conductive fillers: such as carbon black, carbon fiber, etc., can make PP have certain conductive properties, which is suitable for automotive parts that need antistatic or conductive.
Processing performance modification:
Flowability modification: By adjusting the molecular weight distribution or adding processing aids, the flowability of PP can be improved, which is convenient for injection molding.
Through these modification methods, polypropylene materials can better meet the various performance requirements of automotive parts, such as mechanical strength, heat resistance, aging resistance, flame retardancy, etc., and thus be more widely used in the automotive field.