Must read essential knowledge! Deep analysis of PET material
Explore essential insights on PET material in our comprehensive analysis. Uncover its unique properties, diverse applications, and significant environmental impact. This invaluable resource is perfect for students, professionals, and eco-conscious readers eager to deepen their understanding of PET's crucial role across various industries. Stay informed and engaged—dive into our full article!
PET polyethylene terephthalate, a type of polymer, is mainly used in food packaging films, textile fibers, and other applications. Now, its usage as a packaging material is increasing, not only for soda bottles, but also for amorphous PET (APET), crystalline PET (CPET) cans and plates. In the past five years, engineering grade PET and copolyesters have been used as new polymer products for engineering and special packaging materials, respectively.
The successful application of PET in packaging materials for soda drinks is due to its toughness and transparency, orientation ability, excellent economic value, and the development of high-speed bottle processing technology. PET cosmetic packaging bottles are lightweight, shatter resistant, reusable, and have excellent airtightness. Fully filled 2-liter PET cosmetic packaging bottles are 24% lighter than similar glass bottles; The weight of an empty bottle is 1/10 of that of a glass bottle of the same model. To save labor, energy, and costs in all stages from producers to consumers.
Chemistry and performance: PET for beverage bottles is produced from terephthalic acid (TPA) obtained by the oxidation of p-xylene. Benzoic acid can be purified or reacted with methanol to produce dimethyl terephthalate (DMT), or further oxidized to produce pure terephthalic acid (PTA).
Another basic raw material for PET is ethane, which is converted into ethylene glycol (EG) through a reaction. PET is a condensed polymer produced by the continuous polymerization reaction of DMT (or PTA) and EG in a molten state, which is then polymerized in a solid state to obtain large grains, final molecular weight, and intrinsic viscosity. This solid-state process also results in a sufficiently low ethanol content in the polymer.
The melting point of general commodity PET resin is about 480F, but the melting point of high crystalline PET is about 520F.
Directed crystalline PET has excellent strength. Resilience and transparency, and resistance to weak acids, bases, and many solvents.
Special grade: Stretch blown PET can provide solid, green, and light yellow PET. The colored polymer in the reactor does not require any adverse effects on its physical properties and improves the uniformity of color. Various pure resins with different intrinsic viscosities can be obtained. The slow crystallization rate of PET copolymers allows for the production of high-quality cosmetic packaging bottles under a wide range of processing conditions. A polymer that can be extruded and blow molded can also be provided.
This material has the advantages of excellent melt strength and slow crystallization speed, and can be easily processed on suitable extrusion blow molding equipment. Various reinforced, flame-retardant, and other specialized polymers are constantly being introduced or improved to meet new applications.
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