Many people think that polyester and fake down type polyester staple fiber are two different types of fibers, but they actually refer to the same raw material. Polyester is the world's common name, first because of the name of the earlier production of products famous, now has become a common name; Dacron is the Chinese name, and dacron is generally named after dacron in China.

Polyethylene terephthalate (pet) is the basic component of Pet, with the molecular formula α-oc-ph-cooch2ch2co2o-αn, so it is also called pet. The chemical structure of the long chain molecule is h(ch2ccooo)noch2ch2oh, and the relative molecular weight is about 18000 ~ 25000. In fact, there are a small number of monomers and oligomers, which have oligomerization degree and ring, and polyethylene terephthalate (a) and ethylene glycol (eg) can be formed by direct esterification of terephthalate 9bet.

From the molecular composition of polyester, it is composed of short aliphatic chain, ester group, benzene ring and terminal alcohol hydroxyl group. In addition to the two alcohol-terminated hydroxyl groups, there are no polar groups in polyester fiber, so the hydrophilicity of polyester fiber is very poor. The polyester molecule contains about 46% of the ester group, which can be hydrolyzed and pyrolyzed at high temperature, washed with alkali soap, and reduce the degree of polymerization. The polyester molecule also contains aliphatic hydrocarbon chains, which can make the polyester molecule flexible. However, since polyester molecules also have benzene rings that cannot rotate internally, polyester macromolecules are basically rigid molecules, and the molecular chain is easy to keep linear. Therefore, polyester macromolecules are easy to form crystals under such conditions, so the crystallinity and orientation of polyester are high.

Polyester is an important variety of synthetic fiber, and is the trade name of polyester fiber in China. It is a fiber-forming polymer, polyethylene terephthalate, prepared from refined terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) by esterification, transesterification and polycondensation. The fibers are made by spinning and post-processing.

Polyester is also called terrilon, and Americans also call it "Dacron". When it appeared in the Hong Kong market, people translated it as "indeed cool" or "Dacron "[Liang, Liang in Cantonese], meaning" really cool ", which is a household name.

Polyester is widely used in the manufacture of clothing and industrial products. Flame retardant polyester is widely used because of its flame retardancy. In addition to industrial textiles, architectural interior decoration, vehicle interior decoration, in the field of protective clothing also plays an irreplaceable role. According to the standard of flame retardant protective clothing, metallurgy, forestry, chemical, petroleum, fire protection and other departments should use flame retardant protective clothing. The number of people who should use flame retardant protective clothing in China exceeds one million, and the market potential of flame retardant protective clothing is huge. In addition to pure flame retardant polyester, we can also produce flame retardant, waterproof, oil repellent, anti-static and other multi-functional products according to the special requirements of users. When the flame retardant polyester fabric is finished with water and oil, the flame retardant polyester can improve the function of the flame retardant clothing and the conductive fiber are interwoven, and the flame retardant fiber of the production of anti-static flame retardant fabric and the high-performance fiber can be blended with cotton, adhesive and other fibers to improve the comfort of the protective clothing.

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