is a crystalline saturated polyester, which is milky white or light yellow and highly crystalline, with smooth and shiny surface, good creep resistance, fatigue resistance, abrasion resistance and dimensional stability, small wear and high hardness. The main applications are switches in electronic appliances, instrument machinery, money counters, etc.
Polyethyleneterephthalate is the most important variety of thermoplastic polyester, and its English name is Polyethylenetephthalate, which is abbreviated as PET or PEIT (hereinafter referred to as PET), commonly known as polyester resin. The molecular weight of the repeating unit was 192g/mol. It is a polycondensate of terephthalic acid and ethylene glycol. Together with PBT, it is called thermoplastic polyester or saturated polyester.
in p>1946, Britain published the first patent for preparing PET, and in 1949, the British ICI formula completed the pilot test. However, after purchasing the patent, DuPont Company of the United States established a production device in 1953, which was the first to realize industrial production in the world. In the early days, almost all PET was used in synthetic fibers (commonly known as polyester and dacron in China). Since 198s, PET has made a breakthrough as an engineering plastic. Nucleating agents and crystallization promoters have been developed one after another. As a thermoplastic polyester, PET and PBT have become one of the five major engineering plastics.