Polybutylece terephthalate (referred to as PBT), PBT for the milky white translucent to opaque, crystalline thermoplastic polyester having high heat resistance, toughness, fatigue resistance, self-lubricating, low friction coefficient, weather resistance, low water absorption, only 0.1 % in wet conditions remain a variety of physical properties (including electrical properties), electrical insulation, But the volume resistance, dielectric loss large. Heat water, alkali, acids, oils, halogenated hydrocarbons but are vulnerable to erosion, poor hydrolysis resistance, low temperature can be rapidly crystallized, forming good. The disadvantage is the low notched impact strength, mold shrinkage large. Therefore, most of the glass fiber reinforced or inorganic filler modified the tensile strength, flexural strength can be doubled above, the heat distortion temperature also greatly improved. You can long-term work at 140 ℃, glass fiber reinforced products after the longitudinal and transverse shrinkage consistent, easy to make products warpage.
PBT crystallization speed, the most suitable processing method for injection molding, there are other ways extrusion, blow molding, coating, and various secondary processing molding, molding required before pre-drying, moisture content should be reduced to 0.02%.
PBT (enhanced, modified PBT) is mainly used in the automotive, electronics, industrial machinery and polymer alloys, blends industry, such as a car distributor, body parts, ignition coil frame, insulation cover, exhaust system parts, motorcycle ignition, electrical and electronic industry, such as TV deflection coils, tubes and potentiometer bracket, audio output skeleton transformer, the adapter frame, the switch connectors, electric fans, refrigerators, washing machines Motor Cover, bushings .
There are also transport machinery parts, sewing machines and textile machinery parts, watches shell, tube, iron enclosures, mercury lamp, oven parts, electric tool parts, shielding covers.