Introduction: Polybutylene terephthalate, English name polybutylece terephthalate (referred to as PBT), PBT is milky white translucent to opaque, crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, low weather resistance, low water absorption, only 0.1%, and maintains various physical properties (including electrical properties) and electrical insulation in a humid environment. However, the volume resistance and dielectric loss are large. Heat-resistant water, alkalis, acids, oils, but susceptible to attack by halogenated hydrocarbons, poor hydrolysis resistance, rapid crystallization at low temperatures, good moldability. The disadvantage is that the notched impact strength is low and the molding shrinkage rate is large. Therefore, most of them are modified by glass fiber reinforced or inorganic filler, and the tensile strength and bending strength are more than doubled, and the heat distortion temperature is greatly improved. It can work for a long time at 140 °C. After the glass fiber reinforced, the longitudinal and transverse shrinkage of the product are inconsistent, which makes it easy to warp the product.
PBT has a fast crystallization speed. The most suitable processing method is injection molding. Other methods include extrusion, blow molding, coating and various secondary processing. Pre-drying is required before molding, and the 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 special blending industries. For example, as a distributor in a car, a vehicle gear component, an igniter coil bobbin, an insulating cover, an exhaust system component, a motorcycle igniter, a deflection coil of a television set in the electronic appliance industry, a picture tube and a potentiometer bracket, Acoustic output transformer skeleton, adapter frame, switch connector, electric fan, refrigerator, washing machine motor end cover, bushing. There are also transport machinery parts, sewing machine and textile machinery parts, watch case, lens barrel, electric iron cover, mercury lamp cover, baking oven parts, power tool parts, shielding sleeves, etc.
Commercially available PBT alloys are: PBT/elastomer, PBT/PC/elastomer, PBT/PPO, PBT/PE, PBT/ASA alloy, and the like.
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