Recycled polyester, also known as polyester fiber, commonly known as "polyester". Recycled polyester is a kind of synthetic fiber made by polycondensation of organic dibasic acid and ethylene glycol. It is a polymer compound. It was invented in 1941. It is currently the largest variety of synthetic fibers.

The advantages of recycled polyester fibers are good wrinkle resistance, high strength and good elastic recovery. Easy to iron and does not stick to hair. Regenerated polyester fiber is a synthetic fiber formed by linking macromolecular segments through ester groups to form polymers. Pet is called Pet for short. In my country, polyester wheels are called polyester wheels, which contain more than 85% polyethylene terephthalate.

As early as 1894, succinyl chloride and ethylene glycol were used to produce recycled polyester; in 1898, Ainkang synthesized recycled polyester, and Catals synthesized aliphatic polyester: the recycled polyester synthesized in the early years was mostly aliphatic compounds, The relative molecular weight is low, the melting point is low, and it is easily soluble in water. Therefore, they do not have the use value of textile fibers.

In 1941, Winfield and Dixon in the United Kingdom synthesized recycled polyester with dimethyl terephthalate and ethylene glycol. This polymer can be melt spun into fibers with excellent properties. It can be said that among various synthetic fiber varieties, PET fiber is a relatively late development fiber.

In recent years, with the development of organic synthesis, polymer science and industry, recycled polyester has developed a variety of practical PET fibers with different characteristics. For example, polybutylene terephthalate fiber with high elasticity and polypropylene versus recycled polyester fiber, fully aromatic polyester fiber with ultra-high strength and modulus, etc.: the so-called "catalog ester fiber" usually refers to the polyester fiber Ethylene terephthalate fiber.

Recycled polyester has a series of excellent properties such as high breaking strength and elastic modulus, moderate resilience, good heat setting effect, good heat resistance and light resistance. The melting point of polyester fiber is about 255°C, and the glass transition temperature is about 70°C. Regenerated polyester fibers are morphologically stable under a wide range of use conditions, and the fabric is washable and abrasion resistant.

In addition, recycled polyester also has good resistance (such as resistance to organic solvents, soaps, detergents, and good corrosion resistance. It is stable to weak acids and weak bases, has a wide range of uses, and has a wide range of industrial applications. The rapid development of the petroleum industry is also the cause of polyester fibers. The production of fiberglass provides more abundant and cheaper raw materials. In addition, in recent years, with the development of chemical industry and electronic automatic control technology, the fiber forming and processing process has gradually achieved short-distance and automation.

Recycled polyester has become a fast-growing and high-yield synthetic fiber in my country. In 2010, the global polyester fiber production reached 37.3 million tons, accounting for 74% of the world's total synthetic fibers.