Introduction: Polybutylene terephthalate, English name polybutylece terephthalate (referred to as PBT), PBT is milky white translucent to opaque, crystalline thermoplastic polyester. Has high heat resistance, toughness, fatigue resistance, self-lubricating, low coefficient of friction, weatherability, low water absorption, only 0.1%, in the humid environment still maintain a variety of physical properties (including electrical properties), electrical insulation, However, the volume resistance and dielectric loss are large. Heat-resistant water, alkalis, acids, oils, but vulnerable to attack by halogenated hydrocarbons, poor resistance to hydrolysis, rapid crystallization at low temperatures, good formability. The disadvantages are low notched impact strength and high mold shrinkage. Therefore, most of them are modified with glass fiber or inorganic filler, and their tensile strength and bending strength are more than doubled, and the heat distortion temperature is greatly increased. Can work long-term at 140 °C, glass fiber reinforced products longitudinal and lateral shrinkage inconsistent, easy to warp products.
PBT crystallization speed, the most suitable processing method for injection molding, other methods are extrusion, blow molding, coating and a variety of secondary processing molding, pre-drying before molding, moisture content should be reduced to 0.02%.
PBT (enhanced, modified PBT) is mainly used in automobiles, electronic appliances, industrial machinery and polymer alloys, and specialty blending industries. For example, as a distributor, a gear unit, an ignition coil bobbin, an insulating cover, an exhaust system component, a motorcycle igniter, a deflection yoke of a television set in an electronic appliance industry, a picture tube, and a potentiometer holder, Audio output transformer skeleton, adapter skeleton, switch connector, electric fan, refrigerator, washing machine motor cover, sleeve. In addition there are transport machinery parts, sewing machines and textile machinery parts, watch cases, lens tubes, electric iron covers, mercury lamp shades, baking oven parts, power tool parts, shielding sleeves and so on.
Commercially available PBT alloys include PBT/elastomer, PBT/PC/elastomer, PBT/PPO, PBT/PE, and PBT/ASA alloy.
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