Polyester Performance And Use
Polyester, commonly known as “polyester.” Synthetic fiber obtained by spinning polycondensation of organic dibasic acid and diol, referred to as PET fiber, invented in 1941, is the first major variety of synthetic fiber.
Polyester fiber has the greatest advantage of good wrinkle resistance and shape retention, with high strength and elastic recovery. Its fast and durable, anti-wrinkle-free, non-stick hair.
Regenerated fibers are mainly divided into two categories: regenerated cellulose fibers and regenerated synthetic fibers. Viscose fiber is the earliest regenerated fiber, new regenerated cellulose fibers such as Lyocell fiber, cellulose carbamate fiber, superconductive viscose fiber, kapok fiber and bamboo fiber have appeared one after another. Polyester fiber accounts for about 70% of synthetic fiber, and the rapid expansion of the polyester in the bottle industry, so recycled fiber to regenerate the main synthetic fibers. Domestic recycled polyester fiber in the research, small-scale industrial test phase.
Polyester and natural fibers compared to the existence of low moisture content, poor air permeability, poor dyeing, easy pilling, easy to stain and other shortcomings. In order to improve these shortcomings, chemical modification and physical deformation methods are adopted. Chemical modification methods are: ① adding hydrophilic groups of monomers or oligomers such as polyethylene glycol copolymerization can increase the fiber moisture absorption rate; ② Add antistatic properties of the monomer copolymerization, can improve the fiber Antistatic and anti-staining performance; ③ adding phosphorus, halogen and antimony compounds to improve the fiber burning resistance; ④ using a lower degree of polymerization of polyester spinning to improve anti-pilling ability; ⑤ with the dye-based (Such as sulfonate, etc.) for copolymerization, in order to improve the dyeing properties of the fiber. After the physical deformation of a variety of special-shaped polyester, composite spinning with other polymers, colored polyester, fine denier polyester and high shrinkage polyester.
The polyester has a specific gravity of 1.38, a melting point of 255-260 ° C, a bond at 205 ° C, a safe ironing temperature of 135 ° C, a very low moisture absorption of only 0.4%, and a filament breaking strength of 4.5-5.5 g / d , Staple fiber 3.5 to 5.5 g / denier; filament elongation at break of 15 to 25%, staple fiber is 25 to 40%; high strength fiber strength up to 7 to 8 g / denier, elongation of 7.5 ~ 12.5%. Polyester has excellent wrinkle resistance, flexibility and dimensional stability, good electrical insulation properties, resistance to sunlight, abrasion, moldy, good chemical resistance, weak acid resistance and weak base. At room temperature, there is a certain resistance to dilute strong acid, poor resistance to strong alkaline. Polyester dyeing performance is poor, usually in the presence of high temperature or carrier with disperse dyes.
Polyester has many excellent textile properties and service performance, wide range of uses, can be made pure textile, but also with cotton, wool, silk, linen and other natural fibers and other chemical fiber blended intertwined, made of many colors, fast and crisp, easy to wash Easy to dry, non-iron and wash can wear good performance of wool, imitation cotton, imitation silk, imitation linen fabric. Polyester fabric is suitable for men and women shirts, outerwear, children’s clothing, upholstery fabrics and carpeting. As polyester has good elasticity and bulk, can also be used as cotton. In the industrial high-strength polyester can be used as tire cord, transport belt, fire hose, cables, nets, etc., can also be used as electrical insulation materials, acid-resistant filter cloth and paper towels. Made of polyester non-woven fabric can be used for interior decoration, carpet at the end of cloth, pharmaceutical industry with cloth, wool, lining and so on.