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Polybutylene terephthalate belongs to the polyester family and is a milky white translucent to opaque crystalline thermoplastic polyester resin made by the polycondensation of BDO with PTA or DMT and obtained by a blending process. Together with PET, they are collectively referred to as thermoplastic polyesters or saturated polyesters.
With a relative density of 1.31 to 1.55, the water absorption rate is the lowest among thermoplastics, only 0.07%. Has excellent toughness and fatigue resistance, high impact strength, self-lubricity and wear resistance, friction coefficient, but notch sensitivity. Good heat and weather resistance, flame resistance, but slow burning. Good dimensional stability, excellent electrical properties, and good arc resistance, but large volume resistivity and high-frequency dielectric loss tangent. Chemical resistance is excellent, and aqueous solutions of alcohols, ethers, aliphatic hydrocarbons, acids, and salts do not work. Resistant to carbon tetrachloride, swells in dichloroethane, swells somewhat in aromatics, acetic acid, and ethyl acetate and decomposes in concentrated nitric acid and sulfuric acid.
1. It is used to make filaments, films, electrical and electronic devices (such as transfer transformers, potentiometers, strip connectors, color display tube sockets, various switches, etc.) and automobiles, and the rest is used for mechanical parts and fiber modification;
2. For the manufacture of instruments, electrical appliances, televisions, machinery and other parts;
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