the differences of PTT and PBT

The differences of PBT and PTT


polybutylene terephthalate 4.jpg

Of polyamide fiber PTT, PBT polyester fiber elasticity and softness and fluffy of acrylic, polyester fouling resistance, and excellent dyeing properties, comfortable handle, with these excellent features, PTT, PBT polyester fiber in the field of chemical fiber.

PTT and PBT polyester fiber have been widely used in various fields due to their excellent performance. It is soft and stretchable, and is widely used in swimsuits, pajamas, underwear and women's tights to meet the requirements of fiber elasticity in these areas. Its dyeing performance is excellent, bright color, color fastness high, in sportswear, coat, knitting sweater, socks products use fiber to stand out. Its anti-pollution ability is strong, can be recycled, in the curtains, bed bedding, mosquito nets, sofa cover, carpet, table cloth, toys, car interior is widely used, such as PBT polyester fiber is so called "new carpet with material".

PBT has excellent mechanical properties

PBT is a polymer composed of high purity terephthalic acid (PTA) and 1, 4-butanediol esterification. Both in the molecular structure of the PBT fiber and polyester same aromatic ring, but also has the same as the nylon methyl chain is longer than the time period, so it has both the excellent mechanical properties of polyester and polyamide soft and frictional resistance. Its dyeing properties and dyeing properties are more than polyester and polyamide. It can be used for constant pressure boiling with dispersive dye without carrier. The dyeing fiber has bright color, color fastness and good chlorine resistance. PBT has high rigidity performance, and fiber has excellent fluff and curly value. The surface hardness of PBT is high, and it has excellent conformation in wet state.

PBT, in the main chain structure have longer methylene chain segments, hence its glass transition temperature and melting point was lower than those of PET, but due to the crystallization of PBT, and has strong performance, its speed is 10 times faster than the PET, therefore, used in the process of producing similar drying technology to PET slice, slice not binding.

The critical surface tension of PBT is low, so the anti-fouling ability is stronger.

PBT's young's modulus is lower than PET, similar to PA, so its fibers and products are soft and easy to curl. PBT has good durability, dimension stability and elasticity. PBT fiber and its products are soft, hygroscopic, abrasion resistance and fiber crimp. Tensile elasticity and compression elasticity are excellent, and its elastic recovery rate is better than that of polyester. Under the condition of dry and wet conditions, the elasticity is not affected by ambient temperature change, and the price is much lower than that of spandex fiber.

PBT fiber has good chemical resistance and light resistance and heat resistance. Under high temperature and long time sunlight, PBT strength changes very little.

The PTT slicing monopoly was broken

As a new type of fiber, PTT fibers are condensed from phthalic acid (PTA) and 1, 3-propylene glycol (PDO). Because the chemical structure of the PTT is different from PET PET, the performance is different. Glass transition temperature of PTT in 45 ~ 65 degrees Celsius, at the same time of PTT melting point is lower than PET, PBT, and thus in terms of fiber, PTT has higher tolerance, also more competitive in terms of energy saving and process control.

As early as 1941, PTT was successfully developed, but its raw material, PDO, was too expensive, too expensive to produce, and too long to be put on hold. Since the 1990s, with the successful development of new technology in PDO, this innovative fiber has entered the field again.

PTT has great potential for market development in the fields of elastic swimsuit, sportswear and other non-woven fabrics such as medical care and sanitation. In recent years, with the Japanese agms chemical Miroglio, Italy, France, South Korea SK Antex Setilia, Spain and other well-known companies in PTT fiber, PTT fiber research and development into an unprecedented boom.

The PTT and PBT weaving are different

PTT high quality memory fabric is made of jet loom wax weaving. During the weaving process, the tension fluctuation of the spindle position is strictly controlled, which prevents PTT polyester fiber from being drawn under the action of tension. It is important to pay attention to the difference of heating temperature inside and outside. During the whole process, the tension should be controlled to avoid the uneven staining caused by excessive stretching. In principle, the sizing process adopts low temperature and low tension slurry, and the low temperature is drying slowly, and the slurry and drying temperature are strictly controlled.

PTT fabrics need to be predetermined to minimize the problems of willows, weft, and bubbling to ensure the smoothness of the fabric. The wet and hot finishing is generally used for the overflow dyeing machine.

Because the cross-section and composition ratio of the two components of different manufacturers are different, the choice of two-component fiber should match the elastic design of the fabric, which is suitable for the design of the fabric. During production, we must give full consideration to fibre and fabric tightness to configuration rule, textile finishing to keep full contraction of bicomponent PTT components, yarn and fabric fluffy structure formation, as far as possible to reduce the tension in the process of textile finishing.

PBT polyester fiber can be produced by using the original textile processing equipment, and the weft fabric needs to use wide looms.

In order to be able to use PBT fiber, the slurry processing requires relatively low tension to fully adapt to the elastic. It can be used as elastic yarn when knitting. The double rib knitting method is used to make various PBT high-elastic fabrics with proper needle and yarn count, and the length and tension of the coil should be optimized in the process of weaving.

PBT polyester fabric can be dyed with disperse dyes. The glass temperature of PBT is relatively low, but it can be overpressured. In order to obtain high elastic fabrics, the PBT fabric should be finalised at the calibrated temperature for the final heat fixation of the fabric. When the size of the fabric is fixed, the tension in the fabric shall be controlled.


elastichighera little lower than PTT
dyeing temperature
above 100degreebelow 100 degree

so, PBT is a better product. due to its price and many features.

but if u have special usage, must use PTT, pls use PTT