PBT material is an engineering plastic known for its excellent performance characteristics, including outstanding toughness, fatigue resistance, good heat resistance, weather ability, electrical properties, and low water absorption. Modified PBT materials are enhanced with reinforcements and flame retardants to improve heat resistance, flame retardancy, dimensional stability, and modulus, making them suitable for automotive, electronic, and electrical applications.
- Applications in Electrical and Electronic Fields:
The trend toward smarter appliances requires not only advanced design and electrical systems but also plastic materials that meet high glow-wire and high comparative tracking index (CTI) standards. Modified PBT materials offer comprehensive performance through enhancements such as reinforcement, flame retardancy, low warpage, high GWFI/GWIT, high CTI, high hot wire resistance, and high flow characteristics. These materials are used in capacitor cases, high-end induction cooker winding coils, rice cooker socket connectors, micro switches, timers, and coil bobbins.
Many buyers in the electrical and electronics sector specifically require flame-retardant modified PBT materials, particularly for products intended for export markets.
- Applications in Automotive Field:
PBT materials find diverse applications in the automotive industry, including electrical components such as ignition distributors, fuse boxes, and connectors, as well as headlight housings, headlight bezels, window supports, door handles, wiper motor housings, central locking components, air filters, sensors, fuel pump components, and airbag components. With global automotive production expected to grow at an average annual rate of 3.5% over the next five years, demand for modified PBT materials is projected to increase correspondingly.
- Injection Molding Conditions for Modified PBT Materials:
Barrel Temperature: Critical for proper PBT molding. Too low temperatures result in poor plasticization, leading to short shots, sink marks, uneven shrinkage, and lack of gloss. Excessive temperatures cause nozzle drooling, flash, discoloration, and potential degradation. Typically controlled between 240-280°C (230-260°C for glass fiber-reinforced PBT), with nozzle temperature 5-10°C lower than the front barrel section.
Mold Temperature: Directly affects dimensional stability, warpage, cycle time, and crystallinity.
Injection Pressure: PBT melt has low viscosity and good flowability, typically requiring medium injection pressure of 60-90MPa (80-100MPa for glass fiber-reinforced PBT). Pressure should increase with part thickness but not exceed 100MPa to ensure proper mold release.
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