Test Methods and Identification of Recycled Polyester
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oligomer is found to be pure through GC-MC analysis. In context, hydrotalcite acts
as a fine recyclable catalyst for the PET degradation.
2.1.6 Ionic Liquids
Ionic liquid is widely used for PET glycolysis with defined atmospheric pressure, temperature and time. The purification of the glycolysis product is simpler,
unlike metal acetates. The conversion of PET is possible at 180 °C with 1-butyl-3methylimidazolium bromide in 8 h [11]. The main advantage is the ease and cost of
preparation. Reusability of so far called ionic liquid catalyst is need of the hour. Fe
containing magnetic ionic liquid is paid much attention recently for PET glycolysis.
This can potentially replace the commercial catalyst with improved selectivity.
2.2 Upcycling and Downcycling
Upcycling is the process in which recycled raw materials or higher-level application
are used than the original level (e.g. recycled PET yarn from plastic PET bottles).
Downcycling is the process in which lower level quality material is used (e.g.
textile waste to prepare automotive waste).
3 Test Methods of Recycled Polyester
Finished polyester is generally classified into filament, staple, tow and fiberfill.
Filament: Spun polyester is generally called filament since each strand is soften
through agitation and spun for long-lasting wear-life. The smooth-surfaced fabric is
lengthy.
Staple: PET chips or filaments are broken; cut into short with predefined lengths.
They are easier to blend with other fibers and often used in cushion.
Tow: A loosely drawn, continuous and voluminous filaments.
Fiberfill: This type of fiber is combed and stuffed to form voluminous cotton ball.
Among all, filament and staple are the choices of clothing industry [12].
3.1 Polyester Manufacturing
Polyester is formed at 210 °C from dimethyl terephthalate reacting with ethylene
glycol. It produces a single molecule known as monomer while raising temperature
77
oligomer is found to be pure through GC-MC analysis. In context, hydrotalcite acts
as a fine recyclable catalyst for the PET degradation.
2.1.6 Ionic Liquids
Ionic liquid is widely used for PET glycolysis with defined atmospheric pressure, temperature and time. The purification of the glycolysis product is simpler,
unlike metal acetates. The conversion of PET is possible at 180 °C with 1-butyl-3methylimidazolium bromide in 8 h [11]. The main advantage is the ease and cost of
preparation. Reusability of so far called ionic liquid catalyst is need of the hour. Fe
containing magnetic ionic liquid is paid much attention recently for PET glycolysis.
This can potentially replace the commercial catalyst with improved selectivity.
2.2 Upcycling and Downcycling
Upcycling is the process in which recycled raw materials or higher-level application
are used than the original level (e.g. recycled PET yarn from plastic PET bottles).
Downcycling is the process in which lower level quality material is used (e.g.
textile waste to prepare automotive waste).
3 Test Methods of Recycled Polyester
Finished polyester is generally classified into filament, staple, tow and fiberfill.
Filament: Spun polyester is generally called filament since each strand is soften
through agitation and spun for long-lasting wear-life. The smooth-surfaced fabric is
lengthy.
Staple: PET chips or filaments are broken; cut into short with predefined lengths.
They are easier to blend with other fibers and often used in cushion.
Tow: A loosely drawn, continuous and voluminous filaments.
Fiberfill: This type of fiber is combed and stuffed to form voluminous cotton ball.
Among all, filament and staple are the choices of clothing industry [12].
3.1 Polyester Manufacturing
Polyester is formed at 210 °C from dimethyl terephthalate reacting with ethylene
glycol. It produces a single molecule known as monomer while raising temperature