Polyester, a general term for polymer obtained by polycondensation of polyols and polybasic acids. It mainly refers to polyethylene terephthalate (PET), which also includes linear thermoplastic resins such as poly (butylene terephthalate) (PBT) and poly (aryl ester). It is a kind of engineering plastics with excellent performance and wide application. It can also be made into polyester fiber and polyester film. Polyester includes polyester resin and polyester elastomer. Polyester resin also includes poly (ethylene terephthalate) (PET), poly (butylene terephthalate) (PBT)) and poly (aryl ester) (PAR), etc. Polyester elastomer (TPEE) is generally polymerized from dimethyl terephthalate, 1,4-butanediol and polybutanol. The chain segment includes hard segment and soft segment, which is thermoplastic elastomer.
Pet is a kind of high molecular compound. Polyethylene terephthalate (PET) is produced by polycondensation of terephthalic acid (PTA) and ethylene glycol (eg). Part of pet is finally produced by underwater pelletizing. Fiber grade polyester chips are used to manufacture polyester staple fiber and polyester filament, which are raw materials for polyester fiber enterprises to process fiber and related products. As the largest production variety of chemical fiber, polyester occupies nearly 80% of the market share of the chemical fiber industry. Therefore, the market change and development trend of polyester series are the focus of the chemical fiber industry. At the same time, polyester also has bottle, film and other uses, widely used in packaging industry, electronic appliances, medical and health care, construction, automobile and other fields, among which packaging is the largest non fiber application market of polyester, and also the fastest growing field of pet. It can be said that polyester chip is an important intermediate product connecting petrochemical products and products of many industries