Modified PBT

PBT is an opalescent translucent to opaque, crystalline thermoplastic polyester. Has high heat resistance, toughness, and resistance Fatigue resistance, heat aging resistance, weather resistance, and water absorption are low, only 0.1%. They still maintain various physical properties (including electrical properties) and electrical insulation in a humid environment, but have large bulk resistance and dielectric loss. PBT has fast crystallization speed and can be rapidly crystallized at low temperatures, with good formability. The disadvantages are low notch impact strength and large molding shrinkage. Therefore, most of them are reinforced with glass fibers or modified with inorganic fillers, which can increase their tensile strength and bending strength by more than double, and greatly increase their thermal deformation temperature. It can work at 140 ℃ for a long time. After glass fiber reinforcement, the longitudinal and transverse shrinkage of the product are inconsistent, which is easy to cause warpage of the product.