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[Chemical Knowledge]：What is chemical PET? Applications in various fields

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If you are a chemical practitioner, you must have heard of PET. PET is a polyester polymer material, is one of the most widely used plastic materials. In daily life, we can see that many product packaging uses PET plastic, because of its good transparency and tensile properties, it can protect the quality of the product and extend the shelf life of the product.

the full name of

PET is polyethylene terephthalate, and its English name is Polyethylene Terephthalate. Polyethylene terephthalate is a kind of polyester, which is made from terephthalic acid and ethylene glycol. It has important industrial applications and is widely used in bottled food, daily chemical products, medical supplies, electronic products and other fields.

polyethylene terephthalate

preparation method has two kinds, one is direct polycondensation method, the other is indirect polycondensation method.

the

direct polycondensation method is a method in which terephthalic acid and ethylene glycol are mixed and heated to a high temperature, and a specific amount of a catalyst is added to the mixture to produce polyethylene terephthalate. PET prepared by direct polycondensation has high molecular weight, high crystallinity and excellent performance.

the

indirect polycondensation method is that ethylene glycol and terephthalic acid are first esterified to produce ethylene terephthalate, and then polycondensed to produce polyethylene terephthalate. The molecular weight of PET prepared by indirect polycondensation method is smaller, the crystallinity is low, and the performance is slightly inferior to that of direct polycondensation method.

PET has excellent physical and chemical properties, and is a material with high application value. PET is a kind of plastic with good toughness, high hardness, high strength, high toughness, heat resistance, good chemical stability, flame retardant, high transparency, no deformation and no moisture. PET has good optical properties and can produce transparent, flat and smooth surfaces.

In the field of food packaging, PET bottles are the only plastic bottles approved by the FDA. PET bottles have good physical properties and chemical stability, and can be used to contain highly acidic foods and high-sugar juices. PET bottle does not penetrate, can effectively protect the smell and taste of food, can ensure food hygiene and safety.

in the field of medical devices, PET also has a wide range of applications. PET can be made into disposable surgical instruments, because PET itself has good chemical stability, will not release harmful substances, so in the field of medical equipment has been widely used.

in the field of electronic products, PET also has a wide range of applications in the industry. Because PET has good physical properties and excellent transparency, it can be made into liquid crystal display screens, electronic product housings, etc.

In short, chemical PET is an excellent polyester polymer material with excellent physical and chemical properties in food packaging, medical devices, electronic products and other fields have a wide range of applications.

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