.What kind of fibers do PETPBTPTT fibers represent? What are their characteristics?
Answer PET fiber is polyester, and its basic composition is polyethylene terephthalate. It can be seen from the chemical structure of PET fiber that the fiber macromolecules do not contain hydrophilic groups and only have very small polar ester groups, so they are hydrophobic fibers. They have poor hygroscopicity and are difficult to color, requiring high temperature and high pressure coloring or carriers100 °C coloring, hot melt coloring.
PBT fiber is polybutylene terephthalate fiber. It is a variety of polyester and has some properties shared with polyester. However, because the flexible part of the basic link of the PBT fiber macromolecule is longer, its The melting point and glass transition temperature are lower than that of PET fiber, but its elasticity and colorability are good. It can be boiled and dyed at normal pressure with general disperse dyes without the need for carrier coloring.
PTT fiber is an aromatic polymer, which is produced by the polycondensation of 1,3-propylene glycol and terephthalic acid. Its chemical name is polytrimethylene terephthalate, which is another variety of polyester. PTT fiber can be made into various knitted fabrics and woven fabrics, and can be processed into various non-woven fabrics through spunbond and melt-blown methods. It can be processed with PET fiber, polypropylene fiber, cotton, wool and nylon, etc. The weft is combined and finished into a blended chemical fiber fabric. PTT fabrics can also be colored with disperse dyes. Generally, the best coloring temperature is 100~110°C. Desizing is required before coloring. The coloring process is similar to that of knitted fabrics. After coloring, it is heat-set to obtain good elasticity and feel. A comparison of the basic physical properties of PTT fiber and other synthetic polymers is shown in Table 1-4.
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