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[Chemical Knowledge]：Properties and Uses of Polyethylene Terephthalate

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Polyethylene terephthalate (Polyethylene Terephthalate, PET) is a kind of polymer compound, which is widely used in the field of chemical production raw materials. This article will detail the properties and uses of polyethylene terephthalate.

1. the properties of polyethylene terephthalate

1. Physical properties
polyethylene terephthalate is a colorless, transparent, glossy solid with high mechanical strength, hardness, toughness and wear resistance. It has good thermal stability, can be used at higher temperatures, and has excellent electrical insulation properties.
2. Chemical properties
polyethylene terephthalate has excellent chemical corrosion resistance and can resist the erosion of most organic solvents, acids, alkalis and other chemicals. However, it is not resistant to strong acids, strong bases and certain organic solvents, such as ketones, esters, etc.

2. the use of polyethylene terephthalate

1. packaging materials
polyethylene terephthalate as an excellent packaging material, widely used in food, beverage, medicine and other fields. Because of its good transparency, mechanical properties, barrier properties and environmental protection, it is used as a packaging container for bottles, cans, films, etc.
2. engineering plastics
polyethylene terephthalate can be used as engineering plastics, with high strength, high hardness, high toughness and other advantages, can be used in the manufacture of mechanical parts, electronic and electrical components, auto parts and so on.
3. Fiber material
polyethylene terephthalate can be processed into fiber, called polyester (Polyester). Polyester has excellent elasticity, wrinkle resistance, abrasion resistance and dyeing properties, and is widely used in textiles, clothing and other fields. The production
of

3. polyethylene terephthalate The production of
polyethylene terephthalate is mainly realized by two process routes: ester exchange method and direct esterification method. Among them, in the ester exchange method, dimethyl terephthalate and ethylene glycol are subjected to ester exchange reaction to produce diethylene glycol terephthalate, and then polycondensation reaction is performed to obtain polyethylene terephthalate. The direct esterification law is that terephthalic acid and ethylene glycol are directly esterified to produce terephthalic acid diethylene glycol ester, and then polycondensation reaction is carried out to obtain polyethylene terephthalate. The two process routes have their own advantages and disadvantages, and the appropriate process route is selected according to the production conditions and product requirements.

4. polyethylene terephthalate recycling and reuse

waste polyethylene terephthalate can be recycled and reused to achieve effective use of resources and environmental protection. At present, the commonly used recovery methods include physical, chemical and biological methods. Physical method is mainly through cleaning, separation, crushing and other ways to convert waste polyester materials into reusable fragments or particles; chemical law is to convert waste polyester materials into monomers or small molecular compounds through depolymerization reaction, and then reuse; biological law is to use microorganisms or enzymes to decompose waste polyester materials into low molecular compounds, and then biodegrade or reuse.

In short, polyethylene terephthalate, as an important raw material for the production of chemical products, has excellent properties and a wide range of uses. With the continuous progress of science and technology and the expansion of application fields, the production technology and recycling technology of polyethylene terephthalate will be further improved, and make greater contributions to the effective use of resources and environmental protection.

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